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Permit D18-0088 - MUSEUM OF FLIGHT / B-52 PLAZA - LANDSCAPE, IRRIGATION, LIGHTING AND FOOTINGS
MUSEUM OF FLIGHT - B-52 PLAZA 9404 E MARGINAL WAY S D18-0088 Parcel No: Address: r-� City of Tukwila Department of Community Development 6300 Southcenter Boulevard, Suite #100 Tukwila, Washington 98188 Phone: 206-431-3670 Inspection Request Line: 206-438-9350 Web site: http://www.TukwilaWA.gov DEVELOPMENT PERMIT 5729800010 9404 E MARGINAL WAY S Project Name: MUSEUM OF FLIGHT - B-52 PLAZA Permit Number: Issue Date: Permit Expires On: D18-0088 12/18/2018 6/16/2019 Owner: Name: Address: Contact Person: Name: Address: Contractor: Name: Address: License No: Lender: Name: Address: MUSEUM OF FLIGHT FOUNDATION 9404 E MARGINAL WAY S , SEATTLE, WA, 98108 ELIAS GARDNER 110 UNION STREET, STE 300 , SEATTLE, WA, 98101 SELLEN CONSTR CO INC PO BOX 9970 , SEATTLE, WA, 98109 SELLEC*372ND MUSEUM OF FLIGHT FOUNDATION 9404 E MARGINAL WAY S , SEATTLE, WA, 98108 Phone: (206) 973-1685 Phone: (206) 682-7770 Expiration Date: 6/1/2019 DESCRIPTION OF WORK: CREATE A LANDSCAPED AREA OF NATURAL VEGETATION, PLANTINGS, PATHWAYS AND A RAISED PLAZA MOUND WITH COMEMORATIVE STATUE AND FLAGPOLES AS A PART OF AN EXHIBIT OF A RESTORED B-52 AIRCRAFT. THE PROJECT WILL INCLUDE FOOTINGS TO DISTRIBUTE WEIGHT OF THE AIRCRAFT, PLANTING AS NOTED ABOVE, IRRIGATION AND LIGHTING. Project Valuation: $902,289.00 Type of Fire Protection: Sprinklers: Fire Alarm: Type of Construction: VB Electrical Service Provided by: TUKWILA Fees Collected: $17,826.76 Occupancy per IBC: U Water District: TUKWILA Sewer District: TUKWILA Current Codes adopted by the City of Tukwila: International Building Code Edition: International Residential Code Edition: International Mechanical Code Edition: Uniform Plumbing Code Edition: International Fuel Gas Code: 2015 2015 2015 2015 2015 National Electrical Code: WA Cities Electrical Code: WAC 296-46B: WA State Energy Code: 2017 2017 2017 2015 r' Public Works Activities: Channelization/Striping: Curb Cut/Access/Sidewalk: Fire Loop Hydrant: Flood Control Zone: Hauling/Oversize Load: Land Altering: Volumes: Cut: 215 Fill: 750 Landscape Irrigation: 1 Sanitary Side Sewer: Number: 0 Sewer Main Extension: Storm Drainage: Street Use: Water Main Extension: Water Meter: 1 No Permit Center Authorized Signature: Date: 12 ` 8 I hearby certify that I have read and examined this permit and know the same to be true and correct. All provisions of law and ordinances governing this work will be complied with, whether specified herein or not. The granting of this permit does not presume to give authority to violate or cancel the provisions of any other state or local laws regulating construction or the performance of work. I am authorized to sign and obtain this development pit and agree to the conditi ns attached to this permit. Signa Aire: Print Name: `/"(!A // -4/14-" C7C Date: ////) This permit shall become null and void if the work is not commenced within 180 days for the date of issuance, or if the work is suspended or abandoned for a period of 180 days from the last inspection. PERMIT CONDITIONS: 1: ***BUILDING PERMIT CONDITIONS*** 2: Work shall be installed in accordance with the approved construction documents, and any changes made during construction that are not in accordance with the approved construction documents shall be resubmitted for approval. 3: All permits, inspection record card and approved construction documents shall be kept at the site of work and shall be open to inspection by the Building Inspector until final inspection approval is granted. 4: The special inspections and verifications for concrete construction shall be as required by IBC Chapter 17, Table 1705.3. 5: The special inspections for steel elements of buildings and structures shall be required. All welding shall be done by a Washington Association of Building Official Certified welder. 6: Installation of high-strength bolts shall be periodically inspected in accordance with AISC specifications. 7: The special inspection of bolts to be installed in concrete prior to and during placement of concrete. 8: When special inspection is required, either the owner or the registered design professional in responsible charge, shall employ a special inspection agency and notify the Building Official of the appointment prior to the first building inspection. The special inspector shall furnish inspection reports to the Building Official in a timely manner. f1 J 9: A final report documenting required special inspections and correction of any discrepancies noted in the inspections shall be submitted to the Building Official. The final inspection report shall be prepared by the approved special inspection agency and shall be submitted to the Building Official prior to and as a condition of final inspection approval. 10: Subgrade preparation including drainage, excavation, compaction, and fill requirements shall conform strictly with the recommendations given in the soils report. Special inspection is required. 11: All construction shall be done in conformance with the Washington State Building Code and the Washington State Energy Code. 12: Notify the City of Tukwila Building Division prior to placing any concrete. This procedure is in addition to any requirements for special inspection. 13: There shall be no occupancy of a building until final inspection has been completed and approved by Tukwila building inspector. No exception. 14: Remove all demolition rubble and loose miscellaneous material from lot or parcel of ground, properly cap the sanitary sewer connections, and properly fill or otherwise protect all basements, cellars, septic tanks, wells, and other excavations. Final inspection approval will be determined by the building inspector based on satisfactory completion of this requirement. 15: All plumbing and gas piping work shall be inspected and approved under a separate permit issued by the City of Tukwila Building Department (206-431-3670). 16: All electrical work shall be inspected and approved under a separate permit issued by the City of Tukwila Permit Center. 17: Preparation before concrete placement: Water shall be removed from place of deposit before concrete is placed unless a tremie is to be used or unless otherwise permitted by the building official. All debris and ice shall be removed from spaces to be occupied by concrete. 18: VALIDITY OF PERMIT: The issuance or granting of a permit shall not be construed to be a permit for, or an approval of, any violation of any of the provisions of the building code or of any other ordinances of the City of Tukwila. Permits presuming to give authority to violate or cancel the provisions of the code or other ordinances of the City of Tukwila shall not be valid. The issuance of a permit based on construction documents and other data shall not prevent the Building Official from requiring the correction of errors in the construction documents and other data. 19: ***PUBLIC WORKS PERMIT CONDITIONS*** 20: Call to schedule mandatory pre -construction meeting with Scott Moore, Public Works Inspector, (206) 433- 0179. 21: Schedule and attend a Preconstruction Meeting with the Public Works Department (Dave Stuckle, Public Works Inspector and ( , Planning Division), prior to start of work under this permit. To schedule, call Public Works at (206) 433-0179. 22: The applicant or contractor must notify the Public Works Inspector at (206) 433-0179 upon commencement and completion of work at least 24 hours in advance. All inspection requests for utility work must also be made 24 hours in advance. 23: Prior to construction, all utilities in the vicinity shall be field located. NOTE: For City of Tukwila utility locates, call 811 or 1-800-424-5555. 24: Permit is valid between the weekday hours of 7:00 a.m. and 5:00 p.m. only. Coordinate with the Public Works Inspector for any work after 5:00 p.m. and weekends. 25: No work under this permit during weekend hours without prior approval by Public Works. Coordinate with the Public Works Inspector. 26: Work affecting traffic flows shall be closely coordinated with the Public Works Inspector. Traffic Control Plans shall be submitted to the Inspector for prior approval. 27: Flagging, signing and coning shall be in accordance with MUTCD for Traffic Control. Contractor shall provide certified flagmen for traffic control. Sweep or otherwise clean streets to the satisfaction of Public Works each night around hauling route (No flushing allowed). Notify Public Works Inspector before 12:00 Noon on Friday preceding any weekend work. 28: Any material spilled onto any street shall be cleaned up immediately. i 29: Prior to moving the building on-site, a copy of the WSDOT moving permit, route map and proposed moving schedule shall be submitted to the City Development/Permits Engineer for validation. NO MOVING ACTIVITY SHALL BE COMMENCED UNTIL THIS VALIDATION HAS BEEN FORMALLY RECEIVED OR THE MOVER HAS CONTACTED THE DEVELOPER/PERMITS ENGINEER AT (206) 433-0179 TO VERIFY THE SAME. If a WSDOT permit has not been approved for the move, the City permit will need to be applied for. 30: Temporary erosion control measures shall be implemented as the first order of business to prevent sedimentation off-site or into existing drainage facilities. 31: The site shall have permanent erosion control measures in place as soon as possible after final grading has been completed and prior to the Final Inspection. 32: The Land Altering Permit Fee is based upon an estimated 215 cubic yards of cut and 750 cubic yards of fill. If the final quantity exceeds this amount, the developer shall be required to recalculate the final quantity and pay the difference in permit fee prior to the Final Inspection. 33: From October 1 through April 30, cover any slopes and stockpiles that are 3H:1V or steeper and have a vertical rise of 10 feet or more and will be unworked for greater than 12 hours. During this time period, cover or mulch other disturbed areas, if they will be unworked more than 2 days. Covered material must be stockpiled on site at the beginning of this period. Inspect and maintain this stabilization weekly and immediately before, during and following storms. 34: From May 1 through September 30, inspect and maintain temporary erosion prevention and sediment at least monthly. All disturbed areas of the site shall be permanently stabilized prior to final construction approval. 35: Pre -construction storm drainage patterns shall be met during and after construction. 36: The property owner is responsible for the maintenance of its storm drainage system and, for this purpose, shall have a maintenance plan in place and the responsibility for maintenance assigned prior to Public Works final. 37: It shall be verified in writing to the Public Works Inspector that the landscape irrigation system contains a State Department of Health approved double check valve assembly. This shall be done prior to the Final Inspection. 38: Geotechnical Engineer/Soils Engineer shall provide certification of trench backfill to the Public Works Inspector. Trench backfill shall be per 2012 WSDOT Standard Specifications for Road, Bridge, and Municipal Construction. (No native backfill unless approved by the City Engineer.) 39: Maintain emergency, pedestrian, and vehicular access to buildings, trails and transit at all times. 40: ***PUBLIC WORKS PERMIT CONDITIONS*** 41: 1. Verify that tree protection measures are installed prior to any construction activity taking place. 2. Trees shall be planted after construction of the B-52 Park, so as not to be damaged by construction equipment. 3. Trees may be planted between October 15th and April 15th. 4. Schedule a post -construction inspection of protected trees with the City's urban environmentalist 42: Planning 1. Sheet C002. Under General, add note "Contact City's Urban Environmentalist (Andrea.cummins@Tukwilawa.gov) prior to any construction activity taking place to verify tree protection measures are installed. 2. L1.00. Show location of any lighting fixtures. 3. L1.10. Add lighting fixtures to Furnishings Schedule. 4. L5.10. a. Malus fusca is appropriate for a wetland area — replace with a more appropriate tree. b. Rhamnus purshiana is a shrub, not a tree. Identify an appropriate replacement tree. c. Add plant spacing for shrubs, annuals, grasses. d. Legend for shrub areas does not correspond to plan. e. Native meadow mix. Specify the type of species included in this mix. Add amount of native meadow seed grass — need 5-25 lbs per acre, depending on species. f. Turf grass. Specify the species of grass proposed. Since most of this planting falls within the shoreline jurisdiction, it must be a native grass seed mix. 5. Sheet L5.20. 80 replacement trees are required as part of the project; 38 replacement trees are proposed. There is significantly more area available for planting on the west side of the site, even with the King County easement. Add more replacement trees on site. If additional trees cannot be planted on the site, the applicant shall pay $126 per tree into the City's Tree Replacement Fund. 43: Sheet L5.10. Turf grass proposed is still not native. Since most of this planting falls within the shoreline jurisdiction it must be a native grass seed mix. Revise. Suggest looking at different mixes on this website: http://www.directseedsales.com/native_grass.html PERMIT INSPECTIONS REQUIRED Permit Inspection Line: (206) 438-9350 1700 BUILDING FINAL** 0301 CONCRETE SLAB 5200 EROSION MEASURES 5210 EROSION MEASURES FNL 0201 FOOTING 5040 LAND ALTERING 5060 LANDSCAPE IRRIGATION 1600 PUBLIC WORKS FINAL 5160 PUBLIC WORKS PRE -CON 4037 SI -CAST -IN-PLACE 4000 SI -CONCRETE CONST 4036 SI -DRIVEN DEEP FOUND 4046 SI-EPDXY/EXP CONC 4028 SI-REINF STEEL -WELD 4035 SI -SOILS 4026 SI-STRUCT STEEL 4004 SI -WELDING 5090 STORM DRAINAGE CITY OF TUKif, lA Community Development Department Public Works Department Permit Center 6300 Southcenter Blvd., Suite 100 Tukwila, WA 98188 http://www.TukwilaWA.gov Building Permif No. D /8- ()Qk8 Project No. Date Application Accepted: Q 3 4(., /( f Date Application Expires: ?/ dNt / 1 (For office use only) (( CONSTRUCTION PERMIT APPLICATION Applications and plans must be complete in order to be accepted for plan review. Applications will not be accepted through the mail or by fax. **Please Print** SITE LOCATION Site Address: 9404 E Marginal Way South, 98108 Tenant Name: Museum of Flight PROPERTY OWNER Name: Stan Jaworowski Name: Museum of Flight City: Seattle State: WA Zip: 98101 Address: 9494 E Marginal Way S Email: sjaworowski@srgpartnership.com City: Seattle State: WA Zip: 98108 CONTACT PERSON — person receiving all project communication Name: Stan Jaworowski Address: 110 Union Street, Suite 300 City: Seattle State: WA Zip: 98101 Phone: (206) 973-1696 Fax: (206) 973-1700 Email: sjaworowski@srgpartnership.com GENERAL CONTRACTOR INFORMATION Company Name: Sellen Construction Company Address: 227 Westlake Ave N, PO Box 9970 City: Seattle State: WA Zip: 98109 Phone: (206) 682-7770 Fax: (206) 623-5206 Contr Reg No.: SELLEC*372ND Exp Date: 06/01/2019 Tukwila Business License No.: BUS -0996022 H:Wpplications\Forms-Applications On Line \2011 ApplicationsU'ermit Application Revised - 8-9-11.docx Revised: August 2011 bh King Co Assessor's Tax No.: 5729800010 Suite Number: Floor: New Tenant: ❑ Yes ..No ARCHITECT OF RECORD Company Name: Magnusson Klemencic Associates Company Name: SRG Partnership, Inc. Address: 1301 Fifth Avenue, Suite 3200 Architect Name: Aaron Pleskac Phone: (206) 215-8328 Fax: (206) 292-1201 Address: 110 Union Street, Suite 300 City: Seattle State: WA Zip: 98108 Phone: (206) 973-1700 Fax: (206) 973-1701 Email: apleskac@srgpartnership.com ENGINEER OF RECORD Company Name: Magnusson Klemencic Associates Engineer Name: Robert P. Baxter, P.E. S.E Address: 1301 Fifth Avenue, Suite 3200 City: Seattle State: WA Zip: 98101 Phone: (206) 215-8328 Fax: (206) 292-1201 Email: rbaxter@mka.com LENDER/BOND ISSUED (required for projects $5,000 or greater per RCW 19.27.095) Name: Museum of Flight Address: 9404 E Marginal Way S City: Seattle State: WA Zip: 98108 Page 1 of 4 BUILDING PERMIT INFORMATIOr" 106-431-3670 Valuation of Project (contractor's bid price): $ 800,000 Existing Building Valuation: $ Describe the scope of work (please provide detailed information): Create a landscaped area of natural vegetation, plantings, pathways and a raised plaza mound with commemorative statue and flagpoles as a part of an exhibit of a restored B-52 aircraft. The project will include footings to distribute weight of the aircraft, planting as noted above, irrigation and lighting. Will there be new rack storage? ❑ Yes .. No If yes, a separate permit and plan submittal will be required. Provide All Building Areas in Square Footage Below PLANNING DIVISION: Single family building footprint (area of the foundation of all structures, plus any decks over 18 inches and overhangs greater than 18 inches) *For an Accessory dwelling, provide the following: Lot Area (sq ft): Floor area of principal dwelling: Floor area of accessory dwelling: *Provide documentation that shows that the principal owner lives in one of the dwellings as his or her primary residence. Number of Parking Stalls Provided: Standard: 14 Compact: 44 Handicap: Will there be a change in use? ❑ Yes Q No If "yes", explain: FIRE PROTECTION/HAZARDOUS MATERIALS: ❑ Sprinklers ❑ Automatic Fire Alarm Ij None ❑ Other (specify) Will there be storage or use of flammable, combustible or hazardous materials in the building? ❑ Yes J No If "yes', attach list of materials and storage locations on a separate 8-1/2" x 11" paper including quantities and Material Safety Data Sheets. SEPTIC SYSTEM ❑ On-site Septic System — For on-site septic system, provide 2 copies of a current septic design approved by King County Health Department. H: Applications\Forms-Applications On Line \2011 Applications\Permit Application Revised - 8-9-11.docx Revised: August 2011 bh Page 2 of 4 Existing Interior Remodel Addition to Existing Structure New Type of Construction per IBC Type of Occupancy per IBC 1s` Floor 0 2"d Floor 0 3rd Floor 0 Floors thru 0 Basement 0 Accessory Structure* 0 Attached Garage 0 Detached Garage 0 Attached Carport 0 Detached Carport 0 Covered Deck 0 Uncovered Deck 0 PLANNING DIVISION: Single family building footprint (area of the foundation of all structures, plus any decks over 18 inches and overhangs greater than 18 inches) *For an Accessory dwelling, provide the following: Lot Area (sq ft): Floor area of principal dwelling: Floor area of accessory dwelling: *Provide documentation that shows that the principal owner lives in one of the dwellings as his or her primary residence. Number of Parking Stalls Provided: Standard: 14 Compact: 44 Handicap: Will there be a change in use? ❑ Yes Q No If "yes", explain: FIRE PROTECTION/HAZARDOUS MATERIALS: ❑ Sprinklers ❑ Automatic Fire Alarm Ij None ❑ Other (specify) Will there be storage or use of flammable, combustible or hazardous materials in the building? ❑ Yes J No If "yes', attach list of materials and storage locations on a separate 8-1/2" x 11" paper including quantities and Material Safety Data Sheets. SEPTIC SYSTEM ❑ On-site Septic System — For on-site septic system, provide 2 copies of a current septic design approved by King County Health Department. H: Applications\Forms-Applications On Line \2011 Applications\Permit Application Revised - 8-9-11.docx Revised: August 2011 bh Page 2 of 4 PUBLIC WORKS PERMIT INFOr ATION - 206-433-0179 Scope of Work (please provide detailed information): Provide infrastructure necessary for the exhibit of a restored B-52 aircraft and Veteran's Memorial Plaza. Work includes excavation and fill necessary for footings that will support the aircraft, pathways, a raised mound with concrete plaza, statue and flagpoles, bench seating and educational exhibits. Call before you Dig: 811 Please refer to Public Works Bulletin #1 for fees and estimate sheet. Water District VI ...Tukwila ❑ ...Water District #125 0 ...Water Availability Provided Sewer District ..• .Tukwila ❑ ...Sewer Use Certificate ❑ .. Highline 0...Valley View 0 .. Renton 0...Sewer Availability Provided ❑ .. Renton ❑ .. Seattle Septic System: ❑ On-site Septic System — For on-site septic system, provide 2 copies of a current septic design approved by King County Health Department. Submitted with Application (mark boxes which apply): VI ...Civil Plans (Maximum Paper Size — 22" x 34") ..• .Technical Information Report (Storm Drainage) ❑ ...Bond ❑ .. Insurance ❑ .. Easement(s) Proposed Activities (mark boxes that apply): ❑ ...Right-of-way Use - Nonprofit for Less than 72 hours 0 ...Right-of-way Use - No Disturbance ..• .Construction/Excavation/Fill - Right-of-way 0 Non Right-of-way m ...Total Cut 215 cubic yards ..• .Total Fill 750 cubic yards ❑ ...Sanitary Side Sewer 0 ...Cap or Remove Utilities 0 ...Frontage Improvements ❑ ...Traffic Control ❑ ...Backflow Prevention - Fire Protection Irrigation Domestic Water ❑ ...Permanent Water Meter Size... ❑ ...Temporary Water Meter Size .. ❑ ...Water Only Meter Size 171.. Geotechnical Report 0 .. Maintenance Agreement(s) 0 ...Traffic Impact Analysis ❑ ...Hold Harmless — (SAO) ❑...Hold Harmless — (ROW) ❑ .. Right-of-way Use - Profit for less than 72 hours 0 .. Right-of-way Use — Potential Disturbance ❑ .. Work in Flood Zone 0 .. Storm Drainage ❑ .. Abandon Septic Tank ❑ .. Curb Cut ❑ .. Pavement Cut ❑ .. Looped Fire Line 0 ...Sewer Main Extension Public ❑ ...Water Main Extension Public 11 51 ❑ .. Grease Interceptor ❑ .. Channelization ❑ .. Trench Excavation 0 .. Utility Undergrounding WO # WO # WO # ❑...Deduct Water Meter Size Private 0 Private 0 FINANCE INFORMATION Fire Line Size at Property Line 8", 10" Number of Public Fire Hydrant(s) ..• .Water ❑ ...Sewer ❑ ...Sewage Treatment Monthly Service Billing to: Name: Museum of Flight 2 Day Telephone: (206) 764-5720 Mailing Address: 9404 E Marginal Way S Tukwila WA 98108 Water Meter Refund/Billing: Name: Museum of Flight Mailing Address: 9404 E Marginal Way S City State Day Telephone: (206) 764-5720 Seattle WA City State Zip 98108 Zip H:Wpplications\Forms-Applications On Line \2011 Applications\Permit Application Revised - 8-9-11.docx Revised: August 2011 bh Page 3 of 4 PERMIT APPLICATION NOTES — \ r� Value of Construction — In all cases, a value of construction amount should be entered by the applicant. This figure will be reviewed and is subject to possible revision by the Permit Center to comply with current fee schedules. Expiration of Plan Review — Applications for which no permit is issued within 180 days following the date of application shall expire by limitation. The Building Official may grant one or more extensions of time for additional periods not exceeding 90 days each. The extension shall be requested in writing and justifiable cause demonstrated. Section 105.3.2 International Building Code (current edition). I HEREBY CERTIFY THAT I HAVE READ AND EXAMINED THIS APPLICATION AND KNOW THE SAME TO BE TRUE UNDER PENALTY OF PERJURY BY THE LAWS OF THE STATE OF WASHINGTON, AND I AM AUTHORIZED TO APPLY FOR THIS PERMIT. BUILDING OWN R OR AUTHO ' IZED AGENT: Signature: Print Name: Stanley S Jaworowski Date: 03/26/2018 Day Telephone: (206) 973-1696 Mailing Address: SRG Partnership Inc, 110 Union St, Suite 300 Seattle WA 98101 H'Applications \Forms -Applications On Line \201 l Applications\Permit Application Revised - 8-9-1 I.docx Revised: August 2011 bh City State Zip Page 4 of 4 BULLETIN A2 TYPE C PERMIT FEE ESTIMATE PLAN REVIEW AND APPROVAL FEES DUE WITH APPLICATION PW may adjust estimated fees PROJECT NAME B-52 Memorial Park Ph 2 PERMIT # If you do not provide contractor bids or an engineer's estimate with your permit application, Public Works will review the cost estimates for reasonableness and may adjust estimates. 1. APPLICATION BASE FEE 2. Enter total construction cost for each improvement category: Mobilization $38,000.00 Erosion prevention $48,400.00 Water/Sewer/Surface Water $15,889.00 Road/Parking/Access $0.00 A. Total Improvements 3. Calculate improvement -based fees: B. 2.5% of first $100,000 of A. $2,500.00 C. 2.0% of amount over $100,000, but less than $200,000 of A. $45.78 D. 1.5% of amount over $200,000 of A. 4. TOTAL PLAN REVIEW FEE (B+C+D) $ 2,545.78 (4) $102,289.00 $250 (1) $0.00 5. Enter total excavation volume 215 cubic yards Enter total fill volume 750 cubic yards Use the following table to estimate the grading plan review fee. Use the reater of the excavation and fill volumes. QUANTITY IN CUBIC YARDS RATE Up to 50 CY Free 51 — 100 $23.50 101 — 1,000 $37.00 1,001 — 10,000 $49.25 10,001 — 100,000 $49.25 for 1ST 10,000, PLUS $24.50 for each additional 10,000 or fraction thereof. 100,001 — 200,000 $269.75 for 1sT 100,000, PLUS $13.25 for each additional 10,000 or fraction thereof. 200,001 or more $402.25 for 1s1200,000, PLUS $7.25 for each additional 10,000 or fraction thereof. GRADING Plan Review Fees 37.00 (5) TOTAL PLAN REVIEW FEE DUE WITH PERMIT APPLICATION (1+4+5) $ 2,832.78 The Plan Review and Approval fees cover TWO reviews: 1) the first review associated with the submission of the application/plan and 2) a follow-up review associated with a correction letter. Each additional review, which is attributable to the Applicant's action or inaction shall be charged 25% of the Total Plan Review Fee. Approved 09.25.02 Last Revised 02/21/17 t:18*oo9e RECEIVED CITY OF TUKWILA MAR 26 2018 PERMIT CENTER BULLETIN A2 TYPE C PERMIT FEE ESTIMATE PLAN REVIEW AND APPROVAL FEES DUE WITH APPLICATION PW may adjust estimated fees 6. Permit Issuance/Inspection Fee (B+C+D) 2,545.78 (6) 7. Pavement Mitigation Fee $ 0.00 (7) The pavement mitigation fee compensates the City for the reduced life span due to removal of roadway surfaces. The fee is based on the total square feet of impacted pavement per lane and on the condition of the existing pavement. Use the following table and Bulletin 1B to estimate the p Approx. Remaining Years Pavement Overlay and Repair Rate (per SF of lane width) 20-15 (100%) $10.00 15-10 (75%) $7.50 10-7 (50%) $5.00 7-5 (33%) $3.30 5-2 (25%) $2.50 2-1 (10%) $1.00 0-1 $0.00 8. GRADING Permit Issuance/Inspection Fee Grading Permit Fees are calculated using the following table. Use the greater of the excavation and fill volumes from Item 5. 159.50 (8) QUANTITY IN CUBIC YARDS RATE 50 or less $23.50 51 —100 $37.00 101 — 1,000 $37.00 for 1St 100 CY plus $17.50 for each additional 100 or fraction thereof. 1,001 — 10,000 $194.50 for lst 1000 CY plus $14.50 for each additional 1,000 or fraction thereof. 10,001 — 100,000 $325.00 for the 1St 10,000 CY plus $66.00 for each additional 10,000 or fraction thereof 100,001 or more $919.00 for 1St 100,000 CY plus $36.50 for each additional 10,000 or fraction thereof. 9. Technology Fee (5% of 6+8) { �c A J1''V t :" 1.0 Approved 09.25.02 Last Revised 02/21/17 b*t t , t i'' • 2 f 135.26 (9) / l / / BULLETIN A2 TYPE C PERMIT FEE ESTIMATE PLAN REVIEW AND APPROVAL FEES DUE WITH APPLICATION PW may adjust estimated fees 10. TOTAL OTHER PERMITS A. Water Meter — Deduct ($25) B. Flood Control Zone ($52.50 — includes Technology Fee) C. Water Meter — Permanent* D. Water Meter — Water only* E. Water Meter — Temporary* * Refer to the Water Meter Fees in Bulletin Al Total A through E $ 0.00 (9) 11. ADDITIONAL FEES A. Allentown Water (Ordinance 1777) $ B. Allentown Sewer (Ordinance 1777) $ C. Ryan Hill Water (Ordinance 1777) $ D. Allentown/Foster Pt Water (Ord 2177) $ E. Allentown/Foster Pt Sewer (Ord 2177) $ F. Special Connection (TMC Title 14) $ G. Duwamish $ H. Transportation Mitigation $ I. Other Fees $ Total A through I $ 0.00 (10) DUE WHEN PERMIT IS ISSUED (6+7+8+9+10+11) $ 2,834.42 ESTIMATED TOTAL PERMIT ISSUANCE AND INSPECTION FEE This fee includes two inspection visits per required inspection. Additional inspections (visits) attributable to the Permittee's action or inaction shall be charged $60.00 per inspection. WATER METER FEE Permanent and Water Only Meters Size (inches) Installation Cascade Water Alliance RCFC 01.01.2017 — 12.31.2017 TotaIl Fee 0.75 $625 $6005 $6630 1 $1125 $15,012.50 $16,137.50 1.5 $2425 $30,025 $32,450 2 $2825 $48,040 $50,865 3 $4425 $96,080 $100,505 4 $7825 $150,125 $157.,950 6 $12525 $300,250 $312,775 Approved 09.25.02 Last Revised 02/21/17 Temporary Meter 0.75" $300 2.5" $1,500 3 RECEIVED CITY OF TUKWILA MAR 2 6 2018 Clear Form PERMIT CENTER f1 ash Register Receipt City of Tukwila DESCRIPTIONS PermitTRAK ACCOUNT QUANTITY PAID $10,348.82 D18-0088 Address: 9404 E MARGINAL WAY S Apn: 5729800010 $10,348.82 DEVELOPMENT $7,150.95 PERMIT FEE R000.322.100.00.00 0.00 $7,146.43 PLAN CHECK FEE R000.345.830.00.00 0.00 $0.02 WASHINGTON STATE SURCHARGE B640.237.114 0.00 $4.50 PUBLIC WORKS $2,705.28 PERMIT ISSUANCE/INSPECTION FEE R000.342.400.00.00 0.00 $2,545.78 GRADING PERMIT ISSUANCE R000.342.400.00.00 0.00 $159.50 TECHNOLOGY FEE $492.59 TECHNOLOGY FEE TOTAL FEES PAID BY RECEIPT: R16163 R000.322.900.04.00 0.00 $492.59 $10,348.82 Date Paid: Tuesday, December 18, 2018 Paid By: THE MUSEUM OF FLIGHT Pay Method: CHECK 99837 Printed: Tuesday, December 18, 2018 3:04 PM 1 of 1 SYSTEMS Cash Register Receipt City of Tukwila DESCRIPTIONS ( PermitTRAK ACCOUNT QUANTITY PAID $2,832.78 D18-0088 Address: 9404 E MARGINAL WAY S Apn: 5729800010 $2,832.78 PUBLIC WORKS $2,832.78 BASE APPLICATION FEE R000.322.100.00.00 0.00 $250.00 GRADING PLAN REVIEW R000.345.830.00.00 0.00 $37.00 CONSTRUCTION PLAN REVIEW TOTAL FEES PAID BY RECEIPT: R14076 R000.345.830.00.00 0.00 $2,545.78 $2,832.78 Date Paid: Monday, March 26, 2018 Paid By: THE MUSEUM OF FLIGHT Pay Method: CHECK 96041 Printed: Monday, March 26, 2018 12:21 PM 1 of 1 SYSTEMS r� Cash Register Receipt City of Tukwila DESCRIPTIONS PAID PermitTRAK $4,645.16 D18-0088 Address: 9404 E MARGINAL WAY S Apn: 5729800010 $4,645.16 DEVELOPMENT $4,645.16 PLAN CHECK FEE TOTAL FEES PAID BY RECEIPT: R14075 R000.345.830.00.00 0.00 $4,645.16 $4,645.16 Date Paid: Monday, March 26, 2018 Paid By: THE MUSEUM OF FLIGHT Pay Method: CHECK 96040 Printed: Monday, March 26, 2018 12:23 PM 1 of 1 SYSTEMS INSPECTION RECORD Retain a copy with permit INSPECTION NO. PERMIT NO. CITY OF TUKWILA BUILDING DIVISION (206) 431-3.7 6300 Southcenter Blvd., #100, Tukwila. WA 98188 Permit Inspection Request Line (206) 438-9350 Project: Type of Ins ciion: Addr ss: �� TV{ D I � �yy��it ikm 14Ci K~ Date Called: Special lnstructions: Date anted: 5.019 p.rn. Requester: Phone No: Approved per applicable codes. El Corrections required prior to approval. OMMENTS: kqac) Inspector: 117 1 1 REINSPECTIO FEE REQUIRED. Prior to next inspection. fee must be paid at 6300 Southcenter Blvd.. Suite 100. Call to schedule reinspection. Date: .10°1 INSPECTION RECORD Retain a copy with permit ))/g-100 INSPECTION NO. PERMIT NO. CITY OF TUKWILA BUILDING DIVISION 6300 Southcenter Blvd., #100, Tukwila. WA 98188 (206) 431-3670 Permit Inspection Request Line (206) 438-9350 Pr t: ,�% N7( f_ Type oof Insppection: "40, t3 AiakS Address: Date Called: Special Instructions: Date Wanted: 3 - z(, - ZD I a.m. p.m. Requester: Phone No: pproved per applicable codes. El Corrections required prior to approval. OMMENTS: 7 �Q7Ct�4S C42i -4719/1/ S tcbtf Inspector: W Date: v..46, C REINSPECTION FEE REQUIRED. Prior to next inspection. fee must be paid at 6300 Southcenter Blvd.. Suite 100. Call to schedute reinspection. INSPECTION RECORD Retain a copy with permit INSP - ON NO. PERMIT NO. CITY OF TUKWILA BUILDING DIVISION DO -00 6300 Southcenter Blvd., #100, Tukwila. WA 98188 Permit Inspection Request Line (206) 438-9350 (206) 431-3670 P ect: , M e t,'inf Type specon: t A dress: (.1 9i/oil L-'114itikyiori_ L.) O� trEaHed�— Special Instructions: pReuest,(__ Dat ante - 7' a.m. p.m. er:52 Phone No: 790M Approved per applicable codes. Corrections required prior to approval. aoG- 3v7 -5:7/j -los (SALL 6 5 Chi, r►c� L,LAW Gothis. d.e-fy prj �Jr,.�.��-S Inspector: REINSPECTION FEE REQUIRED. Prior to next inspection. fee must be paid at 6300 Southcenter Blvd.. Suite 100. Call to schedule reinspection. INSPECTION RECORD Retain a copy with permit I S TION NO. PERMIT NO. CITY OF TUKWILA BUILDING DIVISION 6300 Southcenter Blvd., #100, Tukwila. WA 98188 (206) 431-3670 Permit Inspection Request Line (206) 438-9350 �f3 Project: MA Ojr`�Lii� Type of Inspection: T i Address: E. 9404 t Date Called: Special Instructions: Date Wanted: I '2S-1cl Ca.m; p.m. Requester: Phone No: JApproved per applicable codes. LJ Corrections required prior to approval. COMMENTS: d4 �4 --Zvfz.ikkar e4s '» -eerlat Inspector: Date: REINSPECTION FEE REQUIRED. Prior to next inspection. fee must be paid at 6300 Southcenter Blvd.. Suite 100. Call to schedule reinspection. INSPECTION RECORD Retain a copy with permit INSPECTION NO. PERMIT NO. CITY OF TUKWILA BUILDING DIVISION D153 - 066S 6300 Southcenter Blvd., #100, Tukwila. WA 98188 Permit Inspection Request Line (206) 438-9350 (206) 431-3670 roject: M ^ TyKof Inpection: (i Addres VdS a/e Date Cllled: Special Instructions: Date Wanted.m: aIlie, Reques r: Phone No: Approved per applicable codes. Corrections required prior to approval. COMMENTS: L4 Y v/ (4 6,0")111Z % -712A -/0114CD `11.71-K i z-it1,1,414"% 07-0614),A) or 1,4 eyoit4 iti,t l4 t4 "DupoJG Tb dP -� Inspector: C V For-tr iklfp Date: Z(7-p/mor 3 REINSPECTION FEE REQUIRED. Prior to next inspection, fee must be paid at 6300 Southcenter Blvd.. Suite 100. Call to schedule reinspection. MAYES TESTING ENGINEERS, INC. AI6etaCOr1 COMPANY May 15, 2019 City of Tukwila Building Department 6200 South Center Blvd Tukwila, WA 98188-8188 Attention: Building Official Re: Museum of Flight Vietnam Veterans Memorial Park Final Letter 9404 E. Marginal Way S. Tukwila, WA Project No. M7191024 &GO Office 20225CedavaleyRCM/ S 110 Lyrmccd, WA 98036 ph 425.7429330 *425.745.1737 Tacoma Office 10029 S. Texoma Waj Si E-2 Taccma, WA 98499 ph 253.584.3720 *253.584.3707 Pbutla►dQOfce 7911 NE33rdDrive Sine 190 Patla d, OR97211 ph 503281.7515 *503281.7579 Permit No. D18-0088 This is to inform you that registered special inspections have been completed for this project per our reports, copies of which have been sent to you. Special inspection was provided for: • Reinforced Concrete • Structural Steel Erection To the best of our knowledge, all work inspected was either performed in accordance with, or corrected to conform to, the city -approved drawings or engineer -approved changes. We trust this provides you with the information that you require. Should you have any questions, please call us at (425) 742-9360. Sincerely, MAYES TESTING ENGINEERS, INC. T � Timothy G. Beckerle, P.E. Principal RECEi ,• 'v CITY OF TL KWIC.;., ViAY 11 2019 PERMIT CENTER d�lg-oo€£� Geotechnical Engineering Services Museum of Flight B-52 Foundation Tukwila, Washington RECEIVED for CITY OF TUKWILA Museum of Flight 6ilvY 2 2 2019 February 5, 2016 PERMIT CENTER .. • • GEOENGINEERS Earth Science + Technology Geotechnical Engineering Services Museum of Flight B-52 Foundation Tukwila, Washington for Museum of Flight February 5, 2016 GEOENGINEERS 8410 154th Avenue NE Redmond, Washington 98052 425.861.6000 Geotechnical Engineering Services Museum of Flight B-52 Foundation Tukwila, Washington File No. 8039-010-02 February 5, 2016 Prepared for: Museum of Flight 9404 East Marginal Way Seattle, Washington 98108 Attention: Laurie Haag Prepared by: GeoEngineers, Inc. 8410 154th Avenue NE Redmond, Washington 98052 425.861.6000 Nancy L. Tocriko, PE Senior Geotechnical Engineer Matthew W. Smith, PE Principal NLT:MWS:nld Disclaimer: Any electronic form, facsimile or hard copy of the original document (email, text, table, and/or figure), 0 provided, and any attachments are onlya copy of the original document. The original document is stored by GeoEngineers, Inc. and will serve as the official document of record. Copyright© 2016 by GeoEngineers, Inc. All rights reserved. GEOENGINEERS...0. Table of Contents INTRODUCTION AND PROJECT DESCRIPTION 1 FIELD EXPLORATIONS AND LABORATORY TESTING 1 Field Explorations 1 Laboratory Testing 1 Additional Soil Characteristics 2 PREVIOUS STUDIES 2 SITE CONDITIONS 2 Setting and Site History 2 Site Geology 3 Surface Conditions 3 Subsurface Conditions 3 Soil Conditions 3 Groundwater Conditions 4 CONCLUSIONS AND RIECOMMENDATIONS 4 B-52 Foundation Support 4 Lateral Resistance 5 Earthwork and Structural Fill 5 Excavation Considerations 5 Temporary Cut Slopes 6 Subgrade Preparation 6 Structural Fill 7 Erosion and Sedimentation Control 8 Utility Considerations 9 Shoring 9 Dewatering 9 Pipe Bedding 10 Trench Backfill 10 LIMITATIONS 10 REFERENCES 11 LIST OF FIGURES Figure 1. Vicinity Map Figure 2. Site Plan APPENDICES Appendix A. Field Explorations Figure A-1 - Key to Exploration Logs Figures A-2 through A-3 - Log of Borings Appendix B. Laboratory Testing Figure B-1- Sieve Analysis Results Appendix C. Reports from OnSite and AgSource Laboratories Appendix D. Previous Studies Appendix E. Report Limitations and Guidelines for Use GEOENGINEERS� February 5, 2016 Page i File No. 8039-010-02 • INTRODUCTION AND PROJECT DESCRIPTION This report presents the results of GeoEngineers' subsurface explorations and geotechnical engineering design services for the Museum of Flight's proposed B-52 project in Tukwila, Washington. The project site is shown relative to surrounding physical features on the Vicinity Map (Figure 1) and the Site Plan (Figure 2). We understand that the Museum of Flight (Museum) is currently planning to permanently display a B-52 bomber west of the covered airpark currently under construction. The site for the B-52 will be immediately south of the Aviation High School parking lot and north of Slip 6. The wheel loads for the plane are approximately 125 kips in the back and 60 kips in the front. At this time, the project will entail constructing a foundation to support the B-52 bomber and landscaping around the display. At a later date, other landscape features might be added. Our understanding of the project is based on information provided by Nathan Messmer with SRG Architects and discussions with various team members. The purposes of this study were to review existing geotechnical information and to complete additional subsurface explorations at the project site as a basis for providing geotechnical engineering conclusions and recommendations for the design and construction of the B-52 foundation. Our services were completed in general accordance with our proposal dated December 1, 2015. Our specific scope of services for the geotechnical engineering services included: • Reviewing previous explorations completed at the site and on adjacent properties; • Completing additional borings to characterize the subsurface conditions at the site; • Performing analyses to evaluate various foundation support options; • Completing soil nutrient analyses; and • Preparing this geotechnical engineering report. FIELD EXPLORATIONS AND LABORATORY TESTING Field Explorations The subsurface conditions at the site were evaluated by completing two borings (B-1 and B-2) to depths of 31.5 and 41.5 feet. The approximate locations of these explorations are shown in Figure 2. A detailed description of the field exploration program and the logs of the borings are presented in Appendix A. Laboratory Testing Soil samples were obtained during the drilling and taken to GeoEngineers' laboratory for further evaluation. Selected samples were tested for the determination of moisture content, percent fines, gradation characteristics and Atterberg limits (plasticity characteristics). The tests were performed in general accordance with test methods of the American Society for Testing and Materials (ASTM). A description of the laboratory testing and the test results are presented in Appendix B. GEOENGINEERS_ February 5, 2016 Page 1 File No. 8039-010-02 Additional Soil Characteristics The landscape architect for the project requested that the surficial soils at the site be tested for total metals and certain minerals and other plant nutrient characteristics. Composite soil samples were obtained by obtaining a soil sample from the upper 12 inches at three locations across the east and west half of the site. The samples from the three locations were mixed to develop two composite samples, one for the east half and the other for the west half. Composite 1 represents the west portion of the site and Composite 2 the eastern portion. OnSite Environmental tested the composite samples for total metals. AgSource Laboratories in Umatilla, Oregon tested the samples for nutrients and texture. The results of the soil tests are presented in Appendix C. PREVIOUS STUDIES GeoEngineers reviewed the logs of explorations completed as part of previous studies in the vicinity of the project site, including those completed by GeoEngineers for the design of the Covered Airpark and the Aviation High School. The location of the borings completed for the Aviation High School project closest to the project site are allso shown in Figure 2. The boring logs from the borings shown on the Site Plan are presented in Appendix D. SITE CONDITIONS Setting and Site History The project site is located in the Duwamish Valley west of the Aviation High School and the Covered Airpark (currently under construction) in Tukwila, Washington, as shown in Figure 1. The project site is relatively flat. The south side of the project site is situated about 60 feet from Slip 6 which extends to the east off of the Duwamish River. The proposed plane foundation will be about 120 to 140 feet north and northeast of the slip. The site was originally developed in the 1930s for industrial purposes. The site was originally part of a larger parcel consisting of west and east parcels. The west parcel, abutting the Duwamish River, is where a large chemical processing plant operated. The east portion of the property (the portion of the historical site, now owned by the Museum) was used primarily for offices and lesser industrial facilities. The west and east parcels have been subject to numerous environmental assessments and cleanup actions. GeoEngineers previously completed a Phase I ESA on behalf of the Museum, the results of which are presented in our report for the Museum dated February 28, 2007. The Phase I Environmental Site Assessment (ESA) was completed as part of the Museum's due diligence prior to purchasing the east parcel from Container Properties, the previous property owner. At the time of the Phase I ESA, GeoEngineers concluded that the cleanup action had been successfully completed at the subject property and that no known or suspect environmental conditions were identified for the property with the exception of residual toluene in groundwater (and soil at the base of a remedial excavation) in the southwest portion of the property. These previous environmental cleanup actions consisted of remedial excavation of toluene and metals -contaminated soil across portions of the western half of the property. Additionally, an air sparging/vapor extraction system (AS/VE) is still operating in the southwest corner of the property to remediate toluene -contaminated groundwater remaining in this area of the property. This environmental GEOENGINEERS February 5, 2016 Page 2 File No. 8039-010-02 action is ongoing under the direction of the Environmental Protection Agency (EPA) and is being conducted by the prior property owner, Container Properties. This remedial effort is unrelated to, and will not affect, the Museum's proposed B-52 display plans. GeoEngineers' Phase 1 ESA also concluded that "soil at the site may contain residual concentrations of hazardous substances (less than MTCA cleanup levels) that may require special handling and disposal procedures during site redevelopment." As a part of past clean-up activities by Container Properties, most of the project area was previously excavated to a depth of about 3 feet to remove contaminated soils. These areas were backfilled with clean fill material, but the report does not comment on the degree of compaction applied to the fill soils placed to restore grades. Site Geology Published geologic information for the project vicinity includes a United States Geological Survey Map titled "Geologic Map of Surficial Deposits in the Seattle 30' x 60' Quadrangle, Washington" (Yount et al., 1993) and "The Geologic Map of Seattle - A Progress Report" (Troost et al., 2005). The surficial soils in the vicinity of the site are mapped as alluvial deposits and modified land. The alluvial deposits generally consist of interbedded layers of soil ranging from clay to sand and gravel. These soils were deposited across the valley by the meandering of the Duwamish River, are as much as 250 feet thick and are poorly consolidated. The modified land in this area is typically dredged fill placed to develop Boeing Field and adjacent industrial areas. Surface Conditions The site is relatively level and consists of exposed soil across much of the site and some crushed gravel across other portions of the site. The north and east portions of the site are adjacent to parking areas used for the high school. A 747 and a 737 are currently being stored on the east portion of the site. A fence is present along the south and west boundaries of the site. A large 27 -inch -diameter King County storm sewer is present diagonally across the site. Based on existing information, it appears that the invert for this storm drain is about 12 to 13 feet below existing grade. Subsurface Conditions Soil Conditions Based on the borings completed near the proposed foundation pads for the B-52, the soils within 30 feet of the surface consist mainly of surficial fill overlying mainly granular alluvial deposits. The fill consists of loose to medium dense silty sand with some gravel to stiff sandy silt and appears to be about 4 to 5 feet in thick. The fill is underlain by granular alluvial deposits consisting of loose to medium dense sand to silty sand with occasional interbedded layers of silt and sandy silt. A thin (2- to 3 -foot -thick) layer of medium stiff silt was encountered within the sand deposits. This upper layer of silt was thicker (5 to 7 feet) in the borings completed for the high school. A clean sand deposit was encountered at a depth ranging from about 11 to 14 feet. At a depth of about 24 feet, the alluvium transitions back to interbedded silty sand and sandy silt deposits. Based on our explorations completed for Aviation High School and the Covered Airpark, we anticipate that below a depth of about 30 to 40 feet, the silt layers are thicker and more numerous. At a depth of about 60 to 65 feet, the upper interbedded granular and fine-grained alluvial deposits are underlain by deposits of soft silt and clay with varying amounts of silt and organic matter (lacustrine fine- grained soils). The soft lacustrine fine-grained soil deposits are underlain by medium dense to very dense GEOENGINEERSQ February 5, 2016 Page 3 File No. 8039-010-02 sand and gravel deposits which contain some shell fragments, suggesting that they were deposited in an estuarine environment. Groundwater Conditions Groundwater was generally encountered during drilling at depths ranging from 7 to 9 feet below the ground surface. Based on observations during construction of the high school and the Covered Airpark, we anticipate that the groundwater is typically at a depth of 9 to 12 feet except during extreme high tide events or prolonged periods of precipitation. Groundwater conditions should be expected to fluctuate as a function of season, precipitation, and tidal fluctuations of the Duwamish River and other factors. CONCLUSIONS AND RECOMMENDATIONS Based on the results of our subsurface explorations and our geotechnical engineering evaluations, it is our opinion that the foundation for the B-52 bomber can be supported on shallow spread foundations as currently planned. We estimate that the foundations might experience 1 to 2 inches of settlement, but understand that the display can tolerate this amount of settlement. We understand that the Museum and project team are aware that the site is underlain by thick granular deposits which are susceptible to liquefaction during a large earthquake. Therefore, if a large earthquake event occurred, additional settlement or lateral spreading into Slip 6 could impact the foundations; we understand that the Museum is willing to accept this risk. The foundations will be close to the existing King County Storm drain. However, as the invert of the storm drain is 12 to 13 feet below existing grade, in our opinion the Toads from the plane will have minimal impacts on the storm drain. The upper fill soils contain sufficient fines that they will become soft and easily disturbed if wet. To minimize disturbance of the near -surface soils and allow for amending these soils for landscaping purposes, we recommend that the earthwork and grading be accomplished during the dryer months of the year. It will be difficult to reuse excavated on-site soil during wet weather. We previously prepared a soil handling plan for the Museum's use during construction for the Covered Airpark. For this project, we have recommended to the Museum and project team members that it should be a goal to keep soil on the property. Although this portion of the Museum's property has been remediated, the soil likely still contains chemicals that, although nota regulatory condition, would need to be tested and handled appropriately if taken off site. B-52 Foundation Support We recommend that the shallow foundations used to support the B-52 bomber be founded on a zone of properly compacted structural fill to provide more uniform support near the base of the foundation. We recommend that thefoundations be founded on a layer of structural fill or crushed rock with a minimum thickness of 18 inches. The structural fill/crushed rock should be compacted to at least 95 percent of the maximum dry density (MDD) in general accordance with ASTM International (ASTM) D 1557. If sand is exposed at the base of the excavation, we recommend the exposed surface be recompacted. If silt is exposed along the base of the excavation, we recommend that a woven geotextile fabric such as Mirafi 500X be placed between the exposed soil and the new structural fill. The fabric will aid as a GEOENGINEERSQ February 5, 2016 Page 4 File No. 8039-010-02 separation layer between the silt soil and the structural fill. The zone of structural fill should extend laterally beyond the footing edges a horizontal distance at least equal to the thickness of the fill where possible. All loose or disturbed soil must be removed prior to placing the structural fill pad. An allowable soil bearing value of 1,500 pounds per square foot (psf) may be used for support of the plane foundations supported on a zone of structural fill as described above. The allowable soil bearing value applies to the total of dead and long-term live Toads and may be increased by up to one-third for wind or seismic loads. For this recommended bearing pressure, we anticipate that the footings will likely be about 7 to 10 feet in width and length to support the plane loads. We estimate that a new isolated footing subjected to a long-term dead load of 1,500 psf for a footing 10 feet square could experience between 1/2 and 1.5 inches of settlement. As discussed above, we understand that the owner recognizes that this type of foundation is susceptible to additional settlement if an earthquake induces liquefaction in the underlying soils. Lateral Resistance Lateral Toads can be resisted by passive resistance on the sides of the footings and by friction on the base of the footings. Passive resistance should be evaluated using an equivalent fluid density of 350 pcf where footings are surrounded by structural fill compacted to at least 95 percent of MDD, as recommended. The structural fill should extend out at least a distance equal to two and one-half times the depth of the foundation element from its face. A passive pressure of 250 pcf should be used if the footing is poured directly against existing fill or native soils. These values also assume the ground surface in front of the footing will be level for a horizontal distance equal to at least two times the depth of the footing. If soils adjacent to footings are disturbed during construction, the disturbed soils must be recompacted, otherwise the lateral passive resistance value must be reduced. Resistance to passive pressure should be calculated from the bottom of adjacent paving or below a depth of 1 foot where the adjacent area is unpaved, as appropriate. Frictional resistance can be evaluated using 0.45 for the coefficient of base friction against footings which are underlain by structural fill. The above values incorporate a factor of safety of about 1.5. Earthwork and Structural Fill Excavation Considerations The near -surface soils encountered in the explorations typically consist of sand with variable amounts of silt, and silt. We anticipate that these soils can be excavated with conventional excavation equipment such as backhoes, trackhoes and dozers. We anticipate that most excavations required for the project will be relatively shallow, on the order of 2 to 4 feet in depth. At this time, we do not anticipate the need for shoring other than possibly the use of trench boxes or trench shields for utility trenches, which is discussed in the "Utility Considerations" section of this report. We anticipate that the depth of the excavations required for the foundations will generally be above the anticipated water level. Perched groundwater may be encountered above this depth if work takes place during or immediately after extended wet weather. We anticipate that the perched water can be handled during construction by sump pumping, as necessary. All collected water should be routed to suitable discharge points. GEOENGINEERS February 5, 2016 Page 5 File No. 8039-010-02 Temporary Cut Slopes All temporary cut slopes and shoring must comply with the provisions of Title 296 Washington Administrative Code (WAC), Part N, "Excavation, Trenching and Shoring." The contractor performing the work has the primary responsibility for protection of workers and adjacent improvements. We recommend temporary cut slope inclinations of 11/2H:1V (horizontal to vertical) in the existing fill and alluvial deposits encountered at the site. Some caving/sloughing of the cut slopes may occur at this inclination. The inclination may need to be flattened by the contractor if significant caving/sloughing occurs. These cut slope recommendations apply to fully dewatered conditions. For open cuts at the site, we recommend that: • No traffic, construction equipment, stockpiles or building supplies be allowed at the top of the cut slopes within a distance of at least 5 feet from the top of the cut. • Exposed soil along the slope be protected from surface erosion using waterproof tarps or plastic sheeting. • Construction activities be scheduled so that the length of time the temporary cut is left open is reduced to the extent practicable. • Erosion control measures be implemented as appropriate such that runoff from the site is reduced to the extent practicable. • Surface water be diverted away from the excavation. • The general condition of the slopes be observed periodically by GeoEngineers to confirm adequate stability. Because the contractor has control of the construction operations, the contractor should be made responsible for the stability of cut slopes, as well as the safety of the excavations. The contractor should take all necessary steps to ensure the safety of the workers near slopes. Subgrade Preparation The on-site soils below the existing pavement contain a significant amount of fines (silt) and are moisture - sensitive. Operation of equipment on these exposed soils will be difficult under wet conditions. Disturbance of shallow subgrade soils should be expected if subgrade preparation work is done during periods of wet weather. We anticipate that either existing sand fill or native silt and sand will be exposed across the excavation. If sand or granular NI is exposed, we recommend recompacting the exposed footing subgrade to a dense and unyielding condition. If silt is exposed, as discussed above we recommend that a woven geotextile be placed across the subgrade after all loose soil removed. We anticipate that the depth of the excavation required for the foundation will generally be above the water table. Perched groundwater may be encountered if work takes place during or immediately after extended wet weather. We anticipate that the perched water can be handled during construction by sump pumping, as necessary. All collected water should be routed to suitable discharge points. GEOENGINEERS February 5, 2016 Page 6 File No. 8039-010-02 Structural Fill We understand the Museum desires to limit the amount of soil exported from the site. The on-site soils in the upper 5 feet typically consist of fine to medium sand with a high percentage of silt. Thus, the on-site sand may be considered for use as structural fill only for placement during periods of dry weather. This will likely not be practicable unless site work is completed during the normally dry summer months (July through September. Even if reused in landscape areas, the fill will be difficult to place and compact during wet weather. The following sections of this report present options for structural fill placement that will be dictated by the weather conditions. On-site Soils The surficial on-site near -surface soils are anticipated to consist of mainly silty fine to medium sand with gravel with some areas of sandy silt. In general, most of the on-site sand is anticipated to contain sufficient fines as to be moisture -sensitive and thus will be difficult to reuse as structural fill unless protected from rain during storage and placed and compacted during extended periods of dry weather. The silt should only be reused in landscape areas. Wet Weather Conditions If construction is planned for the wet winter months, we recommend that imported structural fill be included for construction of the foundation pads. Materials Materials used to support foundations, structures, roadways and parking areas are classified as structural fill for the purpose of this report. Structural fill material quality varies depending upon its use, as described below: • Structural fill to support the plane foundations should meet the criteria for common borrow as described in Section 9-03.14(3) of the 2014 Washington State Department of Transportation (WSDOT) Standard Specifications. Common borrow will be suitable for use as structural fill during dry weather conditions only. If structural fill is placed during wet weather, the structural fill should consist of gravel borrow as described in Section 9-03.14(1) of the WSDOT Standard Specifications, with the additional restriction that the fines content by limited to no more than 5 percent. Alternatively, the structural fill can consist of recycled concrete or crushed rock base course in conformance with Section 9-03.9(3) of the WSDOT Standard Specifications. • Structural fill placed as crushed surfacing base course below sidewalks and pavements should meet the requirements of crushed rock base course in conformance with Section 9-03.9(3) of the WSDOT Standard Specifications. Fill Placement and Compaction Criteria Structural fill should be mechanically compacted to a firm, non -yielding condition. Structural fill should be placed in loose lifts not exceeding 8 to 10 inches in thickness. Each lift should be conditioned to the proper moisture content and compacted to the specified density before placing subsequent lifts. Structural fill should be compacted to the following criteria: • Structural fill placed below foundations should be compacted to 95 percent of the MDD estimated in general accordance with ASTM D 1557. GEOENGINEERS_O February 5, 2016 Page 7 File No. 8039-010-02 • Structural fill placed in pavement or sidewalk areas, including utility trench backfill, should be compacted to 90 percent of the MDD estimated in general accordance with ASTM D 1557, except that the upper 2 feet of fill below final subgrade should be compacted to 95 percent of the MDD. • Structural fill placed as crushed rock base course below pavements should be compacted to 95 percent of the MDD estimated in general accordance with ASTM D 1557. ■ Nonstructural fill, such as fill placed in landscape areas, should be compacted to at least 85 percent of the MDD estimated in general accordance with ASTM D 1557. In areas intended for future development, a higher degree of compaction should be considered to reduce the settlement potential of the fill soils. We recommend that a representative from our firm be present during placement of structural fill. Our representative will evaluate the adequacy of the subgrade soils and identify areas needing further work, perform in-place moisture -density tests in the fill to evaluate if the work is being done in accordance with the compaction specifications, and advise on any modifications to procedure that may be appropriate for the prevailing conditions. Erosion and Sedimentation Control Potential sources or causes of erosion and sedimentation depend upon construction methods, slope length and gradient, amount of soil exposed and/or disturbed, soil type, construction sequencing and weather. Implementing an erosion and sedimentation control plan will reduce the project impact on erosion -prone areas. The plan should be designed in accordance with applicable city, county and/or state standards. The plan should incorporate basic planning principles, including: ■ Scheduling grading and construction to reduce soil exposure; • Retaining existing asphalt whenever feasible; • Revegetating or mulching denuded areas; • Directing runoff away from denuded areas; • Reducing the length and steepness of slopes with exposed soils; • Decreasing runoff velocities; ■ Preparing drainage ways and outlets to handle concentrated or increased runoff; • Confining sediment to the project site; and ■ Inspecting and maintaining control measures frequently. In addition, we recommend that sloped surfaces in exposed or disturbed soil be restored so that surface runoff does not become channeled. Some sloughing and raveling of slopes with exposed or disturbed soil should be expected. Temporary erosion protection should be used and maintained in areas with exposed or disturbed soils to help reduce erosion and reduce transport of sediment to adjacent areas and receiving waters. Permanent erosion protection should be provided by paving or landscape planting. GEOENGINEERS� February 5, 2016 Page 8 Fie No. 8039-010-02 Until the permanent erosion protection is established and the site is stabilized, site monitoring should be performed by qualified personnel to evaluate the effectiveness of the erosion control measures and to repair and/or modify them as appropriate. Provisions for modifications to the erosion control system based on monitoring observations should be included in the erosion and sedimentation control plan. Utility Considerations Shoring We anticipate that trench excavations required to install utilities and sewers will range from about 3 to 6 feet in depth. All temporary cut slopes and shoring must comply with the provisions of Title 296 WAC, Part N, "Excavation, Trenching and Shoring." The contractor performing the work has the primary responsibility for the protection of workers and adjacent improvements. Temporary shoring will be necessary to support excavations where space limitations restrict the use of open cuts. It may be desirable to excavate partially sloping cuts and use a trench box or other shoring for the lower few feet of the trench. Temporary trench shoring using internal bracing can be designed using active soil pressures. We recommend that temporary shoring be designed using a lateral pressure equal to an equivalent fluid density of 35 pcf for conditions with horizontal backfill adjacent to the excavation. These lateral soil pressures do not include traffic, structure or construction surcharges that should be added separately, if appropriate. Shoring should be designed for a traffic influence equal to a uniform lateral pressure of 100 psf acting over the depth of the trench. More conservative pressure values should be used if the designer deems them appropriate. These soil pressure recommendations are predicated upon the construction being essentially dewatered; therefore, hydrostatic water pressures are not included. If portions of the shoring use passive elements such as anchor or reaction blocks, available soil resistance can be estimated using passive soil pressures assuming an equivalent fluid density of 275 pcf above the water table and 130 pcf below the water table. The above -recommended lateral soil pressures do not include the effects of hydrostatic pressures or surcharges behind the wall. The effects of surcharge loads behind the shoring should be considered in design. If effective dewatering methods are used to lower the groundwater level below the bottom of the excavation, hydrostatic pressures need not be added to the soil pressures within the exposed height of shoring. Dewatering The groundwater across the project area is partially influenced by tidal fluctuations of the Duwamish River. In general, based on our observations during construction of the Space Gallery and the Aviation High School, we anticipate that the groundwater is typically 7 to 10 feet below existing grade. However, the groundwater levels could be higher during extreme high tides or during extended periods of heavy precipitation. Because the soils at the project consist mostly of sand with variable amounts of silt, we recommend that the groundwater table be maintained at least 2 feet below the planned bottom of the excavations during construction. Otherwise, excessive groundwater flow into excavations could cause lateral movement of the granular soils into the excavations, possibly destabilizing the excavations or causing excessive ground settlement adjacent to the excavations. We anticipate that the temporary dewatering system could likely consist of sumps, but other dewatering measures might be necessary GEOENGINEERSZ February 5, 2016 Page 9 File No. 8039-01D-02 depending on the construction sequence and time of year. The contractor should be responsible for the design and installation of the temporary dewatering systems required to complete the project. Pipe Bedding Pipeline bedding material should be placed and compacted on the trench subgrade or foundation material until a layer that is a minimum of 6 inches thick or one-fourth of the outside pipe diameter, whichever is greater, is achieved. Where soft or loose soils are encountered below the pipe alignment, we recommend they be removed to a depth of 12 inches below the invert, or to firm material as directed by the engineer. The pipe bedding material should conform to the pipe manufacturer's recommendations, the design engineer's recommendations, the 2014 WSDOT Standard Specification 9-03.12(3), Gravel Backfill for Pipe Zone Bedding or equivalent City standards. Precedence in case of a conflict should be with the design engineer. From a geotechnical standpoint, the native soils will not be suitable for bedding materials. If select import fill is used for the backfill, the trench backfill will be more permeable than the surrounding soils and will fill with water over time. In this case, we recommend that all buried structures such as manholes be designed for uplift assuming that water will) pond to within 5 feet of the top of the manholes. Trench Backfill After the pipe has been laid in the trench, the embedment material should be uniformly placed in maximum 8 -inch -thick loose lifts on each side of the pipe, vibrated or otherwise compacted around the pipe haunches (i.e., at and below the pipe spring line) to the top of the zone. We recommend that trench backfill be compacted as recommended in the "Fill Placement and Compaction Criteria" section of this report. A geotechnical engineer should observe the preparation for, placement, and compaction of structural fill. An adequate number of in-place density tests should be performed in the fill to evaluate if the specified degree of compaction is being achieved. At all times during the placement of the pipeline and placement/compaction of the pipeline embedment material, it is the contractor's responsibility to protect the pipeline from damage (e.g., overstressing or impacting the pipeline with heavy equipment, etc.). LIMITATIONS We have prepared this report for the exclusive use of the Museum of Flight and members of the design team for the B-52 Foundation project in Tukwila, Washington. The data and report should be provided to prospective contractors for their bidding or estimating purposes, but our report, conclusions and interpretations should not be construed as a warranty of the subsurface conditions. Within the limitations of scope, schedule and budget, our services have been executed in accordance with generally accepted practices in the field of geotechnical engineering in this area at the time this report was prepared. No warranty or other conditions, express or implied, should be understood. Any electronic form, facsimile or hard copy of the original document (email, text, table, and/or figure), if provided, and any attachments are only a copy of the original document. The original document is stored by GeoEngineers, Inc. and will serve as the official document of record. Please refer to the appendix titled "Report Limitations and Guidelines for Use" for additional information pertaining to use of this report. GEOENGINEERS� February 5, 2016 Page 10 File No. 8039-010-02 REFERENCES GeoEngineers, 2014, "Geotechnical Engineering Services, Museum of Flight Covered Airpark, Tukwila, Washington." GeoEngineers, 2009, "Geotechnical Engineering Services, Aviation High School at the Museum of Flight, Tukwila, Washington." GeoEngineers, 2007, "Phase 1 Environmental Site Assessment, 9229 East Marginal Way South, Seattle, Washington." GeoEngineers, 2001, "Phase 1 Environmental Site Assessment, 9725 East Marginal Way South, Seattle, Washington." GeoEngineers, 2000, "Phase 1 Environmental Site Assessment, 9725 East Marginal Way South, Seattle, Washington." Idriss, I.M. and Boulanger, R.W. (2008), "Soil Liquefaction During Earthquakes." Earthquake Engineering Research Institute, Monograph MNO-12. Tokimatsu, K. and Seed, H.B. (1987). "Evaluation of Settlement in Sands due to Earthquake Shaking," Journal of Geotechnical Engineering, ASCE, Vol. 113, No. 8, August 1987, pp. 861-878. Troost, K., Booth, D., Wisher, A., and Shimal, A., 2005, "The Geologic Map of Seattle - A Progress Report," U.S. Geological Survey Open -File Report 2005-1252. Washington Administrative Code, Title 296, Part N, "Excavation, Trenching and Shoring." Washington State Department of Transportation, 2016, "Standard Specifications for Road, Bridge and Municipal Construction." Yount, et al., 1993, "Geologic Map of Surficial Deposits in the Seattle 30' x 60' Quadrangle, Washington," U.S. Geological Survey Open -File Report 93-233. GEOENGINEERS� February 5, 2016 Page 11 File No. 8039-010-02 GEOENG1NEERSj GROUT COMPRESSIVE STRENGTH TEST REPORT Report Number: M7191024.0005A Service Date: 03/06/19 Report Date: 04/04/19 Revision 1 - 28 -day results Task: MAYES TESTING ENGINEERS 20225 Cedar Valley Rd Ste 110 Lynnwood, WA 98036-6365 425-742-9360 Alrerracon COMPANY Client The Museum of Flight Attn: Clark Miller 9404 E Marginal Way S Seattle, WA 98108-4046 Project - M7191024 Museum of Flight Vietnam Veterans Memorial Park 9404 E Marginal Way S Seattle, WA Permit No.: D18-0088 Material Information Specified Strength: 6,000 psi @ 28 days Mix ID: Dayton Superior High Strength Supplier: Dayton Superior Batch Time: Plant: Site mix Truck No.: N/A Ticket No.: N/A Field Test Data Test Result Specification Slump (in): Grout Temp. (F): Ambient Temp. (F): Laboratory Test Data Set No. 1 1 1 Specimen Date ID Received 1 2 3 Initial Cure: Inside 03/07/19 03/07/19 03/07/19 Date Age Area Tested (days) (sq in) 03/08/19 2 4.10 03/11/19 5 4.14 04/03/19 28 4.08 Final Cure: Moist Room Sample Information Sample Date: Sampled By: Weather Conditions: Accumulative Yards: Sample Size: Sample Location: Placement Location: Form Material: Samples Plumb: Temperature Range: Maximum Load (lbs) 23,250 29,540 36,790 03/06/19 Sample Time:1325 Michael Mattox Cloudy/light rain Batch Size: 2x2x2" cubes Grout placed under plane support base plates. Brass Molds No. Units: Yes Compressive Strength (psi) 5,670 7,130 9,020 Fracture Type 1 1 1 Tested By KWB JHK HRB Comments: Compressive strength of 28 day Cube complies with the specified strength. **NP= Not Performed Grout sample is fluid Samples Made By: Mayes/Terracon Services: Special Inspections / Materials Testing Mayes/Terracon Rep.: Michael Mattox Reported To: Contractor: Sellen Construction Co., Inc. Report Distribution: (1) The Museum of Flight, Clark Miller (1) City of Tukwila, Jerry Hight Reviewed By:��_ .---- (1) Mayes Testing Engineers, Inc, Donna Pollard (1) Mayes Testing Engineers, Inc, Tom Cain Terry Defooi (1) Sellen Construction Co, Nikolaus (I) SRG Architects, Michael Canales Project Field Manager Korschinowski RECEIVED CITY OF TUKWILA MAY 0 6 2019 PERMIT CENTER Test Methods: ASTM C 31, ASTM C39, ASTM C109, ASTM C138, ASTM C143, ASTM C1019, ASTM C1064 The tests were performed in general accordance with applicable ASTM, AASHTO, or DOT test methods. This report is exclusively for the use of the client indicated above and shall not be reproduced except in full without the written consent of our company. Test results transmitted herein are only applicable to the actual samples tested at the location(s) referenced and are not necessarily indicative of the properties of other apparently similar or identical materials. Page 1 of 1 CR0009, II -16-12, Rev.6 GROUT COMPRESSIVE STRENGTH TEST REPORT MAYES TESTING ENGINEERS Report Number: Service Date: Report Date: Task: M7191024.0005B 03/06/19 04/04/19 Revision 1 - 28 -day results 20225 Cedar Valley Rd Ste 110 Lynnwood, WA 98036-6365 425-742-9360 ..lrerracon COMPANY Client The Museum of Flight Attn: Clark Miller 9404 E Marginal Way S Seattle, WA 98108-4046 Project - M7191024 Museum of Flight Vietnam Veterans Memorial Park 9404 E Marginal Way S Seattle, WA PermitNo.. D18-0088 Material Information Specified Strength: 6,000 psi @ 28 days Mix ID: Dayton Superior High Strength Supplier: Dayton Superior Batch Time: Plant: Site mix Truck No.: N/A Ticket No.: N/A Field Test Data Test Slump (in): Grout Temp. (F): Ambient Temp. (F): Result Specification Laboratory Test Data Set Specimen No. ID 1 1 1 2 1 3 Initial Cure: Date Received 03/07/19 03/07/19 03/07/19 Outside Date Tested 03/08/19 03/11/19 04/03/19 Age Area (days) (sq in) 2 5 28 Final Cure: Sample Information Sample Date: 03/06/19 Sample Time:1325 Sampled By: Michael Mattox Weather Conditions: Cloudy/light rain Accumulative Yards: Batch Size: Sample Size: 2x4°' Sample Location: Placement Location: Grout placed under plane support base plates. Form Material: Plastic Mold No. Units: Samples Plumb: Yes Temperature Range: Maximum Load (lbs) 3.08 12,530 3.11 15,270 3.08 19,820 Moist Room Compressive Strength (psi) 4,070 4,910 6,440 Fracture Type 4 1 1 Tested By KWB KWB HRB Comments: Compressive strength of 28 day Cylinder complies with the specified strength. **NP = Not Performed As per ASTM C780 Note 3, Section 5.2.6„ when cube and cylinder test specimens from like mixtures are to be compared, the cylinder compressive strength is approximately 85% of the cube compressive strength. Samples Made By: Mayes/Terracon Services: Special Inspections / Materials Testing Mayes/Terracon Rep.: Michael Mattox Reported To: Contractor: Sellen Construction Co., Inc. Report Distribution: (1) The Museum of Flight, Clark Miller (I) City of Tukwila, Jerry Hight (I) Mayes Testing Engineers, Inc, Donna Pollard (I) Mayes Testing Engineers, Inc, Tom Cain (1) Sellen Construction Co, Nikolaus (1) SRG Architects, Michael Canales Korschinowski Reviewed By: RECEIVED CITY OF TUKW'ILA MAY 06 201 PERMIT CEIQTE`` Terry Defoo. Project Field Manager Test Methods: The tests were performed in general accordance with applicable ASTM, AASHTO, or DOT test methods. This report is exclusively for the use of the client indicated above and shall not be reproduced except in full without the written consent of our company. Test results transmitted herein are only applicable to the actual samples tested at the location(s) referenced and are not necessarily indicative of the properties of other apparently similar or identical materials. Page 1 of 1 CR0009, 11-16-12, Rev 6 CONCRETE COMPRESSIVE STRENGTH TEST REPORT MAYES TESTING ENGINEERS Report Number: Service Date: Report Date: Task: M 7191024.0006A 03/27/19 04/04/19 .111111111111111111111111111111.16MA, AM. 20225 Cedar Valley Rd Ste 110 Lynnwood, WA 98036-6365 425-742-9360 • 1ferr r7Cen COMPANY Client The Museum of Flight Attn: Clark Miller 9404 E Marginal Way S Seattle, WA 98108-4046 Project - M7191024 Museum of Flight Vietnam Veterans Memorial Park 9404 E Marginal Way S Seattle, WA Permit No.: D18-0088 Material Information Specified Strength: 5,000 psi @ 28 days Mix ID: Supplier: Batch Time: Truck No.: 557175 Stoneway 0532 Plant: 14 519 Ticket No.: 965950 Field Test Data Test Slump (in): Air Content (%): Concrete Temp. (F): Ambient Temp. (F): Plastic Unit Wt. (pcf): Yield (Cu. Yds.): Result 6 63 44 Laboratory Test Data Set Specimen Avg Diam. Area No. ID (in) (sq in) 1 1 3.99 1 2 1 3 1 4 Initial Cure: Outside Plastic Lids Specification Sample Information Sample Date: Sampled By: Weather Conditions: Accumulative Yards: Placement Method: Water Added Before (gal): 0 Water Added After (gal): Sample Location: Placement Location: 03/27/19 Sample Time: 0610 Keenan Schulz Overcast 11 Batch Size (cy): 11 Pump Date Received Date Tested Age at Maximum Test Load (days) (lbs) 7 55,540 28 28 28 12.5 03/28/19 04/03/19 03/28/19 04/24/19 03/28/19 04/24/19 03/28/19 04/24/19 Final Cure: Moist Room Two wingtip footings, the concrete seat wall, and the concrete sidewalk. surrounding the front half of the plane Compressive Strength (psi) 4,440 Fracture Type Tested By 2 ZAJ Comments: Not tested for plastic unit weight. Samples Made By: Mayes/Terracon Services: Special Inspections / Materials Testing Mayes/Terracon Rep.: Keenan Schulz Reported To: Contractor: Sellen Construction Co., Inc. Report Distribution: (1) The Museum of Flight, Clark Miller (I) City of Tukwila, Jerry Hight (1) Mayes Testing Engineers, Inc, Donna Pollard (I) Mayes Testing Engineers, Inc, Tom Cain (1) Sellen Construction Co, Nikolaus (1) SRG Architects, Michael Canales Korschinowski Reviewed By: RECEIVEL; CITY OF TWO -VILA - MAY 0 6 2099 PERMIT CEPt Terry Defo.,: Project Field Manager Test Methods: ASTM C 31, ASTM C39, ASTM Cl38, ASTM C143, ASTM C172, ASTM C231, ASTM C1064, ASTM C1231 The tests were performed in general accordance with applicable ASTM, AASHTO, or DOT test methods. This report is exclusively for the use of the client indicated above and shall not be reproduced except in full without the written consent of our company. Test results transmitted herein are only applicable to the actual samples tested at the location(s) referenced and are not necessarily indicative of the properties of other apparently similar or identical materials. Page I of 1 CR0001, I1-16-12,Rev.6 6 a 4 • w 4 f 5 Austin St -9, -S Holden St No'e Dr S Portland Star 5 Chicago 5t 5 Monroe St S Elmgrove St t 5 Elmgrove St 5 Southern St 5 Southern St 5 Rose 515 Rose St 4 a DOaryaSA 5 Cloverdale 5t Cloverdale St in $ Donovan St S Donovan 5t'5 S m O�rSr, .4n S Concord St reN 5 Henderson St S Director 5t • Dk4naAesnnone eark N 'Bye a 5 TA6t's 5107•.' 4 99 ad i f a 51115t5tm a 5 Director St N 596th St 5 99th 5t 5 99th P1 S 100th St s lark' stGLENDALE S 102nd StL CY N < 4 Hamlin *Almon ,„ Sthae1 T ark Beverly Park Elementary School 4 c 3 5 91st St S 93rd St 1 5 95th St 961.11 St + N Bonn Id N ".Po. J' q. 'oo s 5 87th PI • Glen Aaes Gey Bcwwy pas SOUTHERN HEIGHTS 5 112th St �eJ 5 Webs-. r S` .3" • S Aust.1St 5 Austin 5t S Holden St K 5. 5 °ortI00d St A Sthicaeo St vs S Kenyon St ark Or qN 5'u D 9 0 4 „ wwg lake [le•nenury kneel Yen Asset ElenNnUry School 3 m F � 5, N _ Meseom of r1Sht 1 50th St S98t1".'4 5 103rd 55 5 104th Sl 4 m o L D a ",;,_ L F.; . 5 107th 5t C Miner Emil. Country Qyj a S 115th 51 5 116th 51 5 117th St Seat W r Bwlmi . knee. , s•a1•aknk Phonedent P:18\8039010\GIS\803901002 F1 v S 10815 St.3 •B Notes: 1. The locations of all features shown are approximate. 2. This drawing is for information purposes. It is intended to assist in showing features discussed in an attached document. GeoEngineers, Inc. cannol guarantee the accuracy and content of electronic files. The master file is stored by GeoEngineers, Inc. and will serve as the official record of this communication. Data Source: Mapbox Open Street Map, 2015 Projection: NAD 1983 UTM Zone 10N .o 5, rn 4o S t� 6,a 2,000 1120 5t 0 s Q�Ot�st Sar DULNAMISH 5, D g 5 Thistle 51 N 5 So"'iva., '1 Q 5 Cloverdale SI al 0 45 Cloverda 4 15 ✓ S Kenyon 5t 5 K»nyan 5 o _N 5 s D 4 A N w in S- 4 5 Trenton St kai Pe L G ec` m ve 4A y5 Barton St c N • ve Eat QuwarNsh X 5 Bertefrt 5t 0, elieh > > r Is' a q� :IL 7 SS M 9 ti 5, 2 F, 5(0urr'm s5, 5' 5 Pdgn51 2 5Pcny St 7 ac 3 11 Norfolk at 4 9: 5%C o D N N Ait90 S 004th P1 piwaiMsh (4 Prese51 t5th st Green fiver Tref. 5116th St 5'16° St A se 2,000 Feet 11* Vicinity Map Museum of Flight B-52 Foundation Tukwila, Washington GEOENGINEERS Figure 1 P:\8\8039010\02\CAD\GeoiecfB039010-02 Figure 2(Slte Plan).dwg TAB:layoutl Date Exported: 02/04/16- 0:37 ey ctlkkel BACKFLOW PREVENTION ASSEMBLY TEST REPORT NAME OF PREMISE T5— ✓""` i"w \O AL P9'" Commercial 6I' Residential 0 SERVICE ADDRESS 9404 E. . MAQ61 NA -L- by5 . CITY Sertne ZIP eiatOb CONTACT PERSON "1-000 (S5) PHONE SU- stfzz FAX ( ) LOCATION OF ASSEMBLY Se C09 -Kew OF SCBE DOWNSTREAM PROCESS X-Ff-S454MOa DCVA \0" RPBA ❑ PVBA 0 OTHER NEW INSTALL 0 EXISTING' REPLACEMIENT 0 OLD SER. # PROPER - SG INSTALLATION? YES 0 MAKE OF ASSEMBLY �i.41 MODEL q YJ2t 2.- SERIAL NO. Mal t -1 a SIZE , INITIAL TEST ,,��• PASSED la FAILED ❑ DCVA 1 RPBA DCVA/RPBA RPBA PVBA/SVBA CHECK VALVE NO.1 CHECK VALVE NO.2 OPENED AT PSID AIR INLET OPENED AT PSID LEAKED 0 CLOSED) TIGHT n -6 PSID #1 CHECK PSID LEAKED • CLC)SED TIGHT Q 8 • PSID I)ID NOT C)PEN ■ AIR GAP OK? NEW PARTS❑ AND REPAIRS t'UAN RLPL\CL PART CLLAN REPLACt: PART 0 0 ULAN RtiPLACL- PART CHECK VALVE HELI) AT PSID • a • LEAKED 0 ❑ ❑ ❑ • 0 0 • • 0 • II ■ ❑ ❑ ❑ ❑ CLEANED REPAIRED 0 TEST AFTER REPAIRS PASSED 0 FAILED ■ LEAKED 0 CLOSED TIGHT 0 PSID OPENED AT PSID AIR INLET PSID LEAKED ■ CLOSED TIGHT0 PSID #I CHECK PSII) CHK VALVE PSID AIR GAP INSPECTION: Required tniniunlul air gar ,epar.tu n provided? Yes 0 No ❑ Detector Meter Reading REMARKS: LINE PRESSURE tCJ PSI CONFINED SPACE? NC) TESTERS SIGNATURE: CERT. NO. 13 (921 LI DATE 14- 171 2019 TESTERS NAME PRINTED: Ky Ie ROCK TESTERS PHONE # { 2S3 ) 1431.37 5 I REPAIRED BY: DATE FINAL TEST BY: CERT. NO.1l DATE CALIBRATION DATE CP / I5/ OGAUGE # 1!J JZ.5 ' MODEL MitlethERVICE RESTORED? YES ter NO 0 sy5-5 I certify That this report is ocean*. and 1 have used W'.f :21b-290-190 approved test' methods and test equlpnrnL GEOENG1NEERS7 APPENDIX A Field Explorations GEOENGINEERS 8410154tAvenue NE Redmond, WA 98052 425.861.6000 Field Report File Number: 8039-010-03 Project: Museum of Flight B 52 foundations Date: 1/11/19 Owner: Museum of Flight Time of Arrival: 0900 Report Number: FR -2 Prepared by: Jon C. Koloski Location: Tukwila, WA Time of Departure: 0930 Page: 1 of 1 Purpose of visit: Construction Observation Weather: Cloudy, —50 °F Travel time: 1 Permit Number: Upon arrival to the site I assessed personal safety hazards: ❑ Yes or El Referred to Site Safety Plan and Safety Tailgate if applicable Safety Hazards Were Addressed by : El Staying Alert to Construction and Equipment Hazards 0 Other (describe) A site visit was made today to observe the excavations for the B-52 foundation pads met with Eric Haubrich with Sellen Construction. B-52 Foundation Excavation At the time of our visit the east wall and west footing excavations had been completed. been excavated to subgrade about 2.5 to 3.5 feet below the surrounding ground the excavations consist of 11/4 inch -minus crushed rock. We understand that about for the east wall and about 2 feet for the west footing and was compacted with a large were evaluated by probing with a 1 inch diameter steel probe rod. The probe depths Based on our observations and evaluations, it is our opinion that the footing subgrades in general accordance with the geotechnical aspects of the project plans and specifications. c - Wit" ,m asa at the Museum of We understand surface. Subgrade conditions 18 inches of the crushed vibratory sled. were typically less evaluated today �J Flight. While on site we the areas had excavated in the base of rock was placed The subgrade conditions than 1 inch. have been prepared '."'�,----s�, sr '`.::: -- .�.,...r. 0 THIS FIELD REPORT IS PRELIMINARY A preliminary report is provided solely as evidence that field observation was performed. Observations and/or conclusions and/or recommendations conveyed in the final report may vary from and shall take precedence over those indicated in a preliminary report. FIELD REPRESENTATIVE DATE Jon C. Koloski 01-11-19 .NITHIS FIELD REPORT IS FINAL A final report is an instrument of professional service. Any conclusions drawn from this report should be discussed with and evaluated by the professional involved. REVIEWED BY DATE Nancy L Tochko 01-18-2019 This report presents opinions formed as a result of our observation of activities relating to our services only. We rely on the contractor to comply with the plans and specification throughout the duration of the project irrespective of the presence of our representative. Our work does not include supervision or direction of the work of others. Our firm will not be responsible for job or site safety of others on this project DISCLAIMER:Any electronic form, facsimile or hard copy of the original document (email, text, table, and/or figure), if provided, and any attachments are only a copy of the original document. The original document is stored by GeoEngineers, Inc. and will serve as the official document of record. Attachments: Distribution: Sellen D = su N. CD cD Z N O O N OD O O IW " O O N N O 0 GEOENGINEER 8410154t Avenue NE Redmond, WA 98052 425.861.6000 Field Report File Number: 8039-010-03 Project: Museum of Flight B 52 foundations Date: 1/21/19 Owner: Museum of Flight Time of Arrival: 0930 Report Number: FR -3 Prepared by: Jon C. Koloski Location: Tukwila, WA Time of Departure: 1000 Page: 1 of 1 Purpose of visit: Construction Observation Weather: Cloudy, —50°F Travel time: 1.0 Permit Number: Upon arrival to the site I assessed personal safety hazards: 0 Yes or ® Referred to Site Safety Plan and Safety Tailgate if applicable Safety Hazards Were Addressed by : ® Staying Alert to Construction and Equipment Hazards 0 Other (describe) A site visit was made today to observe the excavations for the B-52 foundation pads met with Eric Haubrich with Sellen Construction. B-52 Foundation Subgrade Evaluation At the time of our visit the east and west footings and the wall footing subgrade understand these areas had excavated been excavated to 18 inches below foundation subgrade elevation with a City of Seattle Type 2 (11/4 inch -minus crushed rock). compacted with a large vibratory sled. The subgrade conditions were evaluated by rod. The probe depths were typically less than 1 inch. Based on our observations and evaluations, it is our opinion that the footing subgrades in general accordance with the geotechnical aspects of the project plans and specifications. rY _...— IC �.: `11R at the Museum of Flight. While on site we preparation work had been completed. We subgrade. The areas were backfilled to The backfill was placed in lifts and was probing with a 1/2 inch diameter steel probe evaluated today have been prepared 0 THIS FIELD REPORT IS PRELIMINARY A preliminary report is provided solely as evidence that field observation was performed. Observations and/or conclusions and/or recommendations conveyed in the final report may vary from and shall take precedence over those indicated in a preliminary report. FIELD REPRESENTATIVE DATE Jon C. Koloski 01-21-19 V THIS FIELD REPORT IS FINAL A final report is an instrument of professional service. Any conclusions drawn from this report should be discussed with and evaluated by the professional involved. REVIEWED BY DATE Nancy L Tochko 01-25-2019 This report presents opinions formed as a result of our observation of activities relating to our services only. We rely on the contractor to comply with the plans and specification throughout the duration of the project irrespective of the presence of our representative. Our work does not Include supervision or direction of the work of others. Durfirm will not be responsible for Job or site safety of others on thls project. DISCLAIMER:Any electronic form, facsimile or hard copy of the original document (email, text, table, and/orfigure), if provided, and any attachments are only a copy of the original document. The original document is stored by GeoEngineers, Inc. and will serve as the official document of record. Attachments: Distribution: Sellen 0 D 'n cro,�. CD (0 Z N O O N W O O Ncri O F- H` O O GEOENGINE 8410154th Avenue NE Redmond, WA 98052 425.861.6000 Field Report File Number: 8039-010-03 Project: Museum of Flight B 52 foundations Date: 2/28/19 Owner: Museum of Flight Time of Arrival: 0745 /1315 Report Number: FR-4 Prepared by: Jon C. Koloski Location: Tukwila, WA Time of Departure: 0915/1345 Page: 1 of 1 Purpose of visit: Construction Observation Weather: Sunny, —50 °F Travel time: 1.25 Permit Number: Upon arrival to the site I assessed personal safety hazards: 0 Yes or ® Referred to Site Safety Plan and Safety Tailgate if applicable Safety Hazards Were Addressed by : ® Staying Alert to Construction and Equipment Hazards 0 Other (describe) A While Backfill We of covered large steel landscaped. plates Based for ( site visit was made today at the request of Eric Haubrich with Sellen Construction observe ongoing construction activities. on site we met with Eric (Sellen) and with Dan with GMCC (earthwork contractor). Our observations were as follows. Evaluation observed the contractor place and compact fill adjacent to the poured foundations and landscape wall. The fill soils consist onsite silty fine sand soils generated from the foundation excavation work. The soils had been stockpiled on site and were with plastic sheeting. The fill was being placed in loose lifts about 10 inches thick and was being compacted with a vibratory sled and with a jumping jack compactor. The compacted backfill was evaluated by probing with a 1h inch diameter probe rod. The probe depths typically ranged from about 4 to 6 inches. We understand the area being filled today will be We understand that the B-52 plane will be moved across this area on route to the foundations pads. Large steel will be placed over the recently placed fill prior to the moving the plane. on our observations and evaluations, it is our opinion that the backfill evaluated today has been adequately compacted landscape areas. O THIS FIELD REPORT IS PRELIMINARY A preliminary report is provided solely as evidence that field observation was performed. Observations and/or conclusions and/or recommendations conveyed in the final report may vary from and shall take precedence over those indicated in a preliminary report. FIELD REPRESENTATIVE DATE Jon C. Koloski 02-28-19 _ V THIS FIELD REPORT IS FINAL A final report is an instrument of professional service. Any conclusions drawn from this report should be discussed with and evaluated by the professional involved. REVIEWED BY DATE Nancy L Tochko 03-11-2019 This report presents opinions toned as a result of ourobservation of activities relatingto ourservices only. We rely on the contractor to comply with the plans and specification threugiouttheduration of the projectirrespective of the presence of our representative. Ou rwork does not inckide supervision ordirection of the work of others. Ou rfi mr will notbe responsible forjob orsite safety of others on this project DISCLAIMER: Anyelectronic form, facsimile or hard copy of the original document (email, text, table, and/orfigure), if provided, and any attachments are on ly a copy of the orignal document. The original document's stored by GeoEngineers, Inc. and vdll serve as the official documentof record. Attachments: Distribution: Sellen 00-T10-6£08 '0N al!k GEOENGINEERSS....0 8410154th Avenue NE Redmond, WA 98052 425.861.6000 Field Report File Number: 8039-010-03 Project: Museum of Flight B 52 foundations Date: 3/1/19 Owner: Museum of Flight Time of Arrival: 0945 Report Number: FR -5 Prepared by: Jon C. Koloski Location: Tukwila, WA Time of Departure: 1030 Page: 1 of 1 Purpose of visit: Construction Observation Weather: Sunny, —40°F Travel time: 1.25 Permit Number: Upon arrival to the site I assessed personal safety hazards: 0 Yes or ® Referred to Site Safety Plan and Safety Tailgate if applicable Safety Hazards Were Addressed by : ® Staying Alert to Construction and Equipment Hazards 0 Other (describe) A site visit was made today at the request of Eric Haubrich with Sellen Construction observe ongoing While on site we met with Eric (Sellen) and with Dan with GMCC (earthwork contractor). Ourobservations Backfill Evaluation We observed the contractor place and compact fill adjacent to the poured foundations and landscape future landscape area consist of onsite silty fine sand soils generated from the foundation excavation was in progress along the outside of the landscape wall in a future sidewalk area. The backfill material 11/4 inch minus crushed rock. The fill was being placed in loose lifts about 10 inches thick and was jumping jack compactor. The subgrade conditions were evaluated by probing with a 1/2 inch diameter steel depths in the native soil backfill typically ranged from about 4 to 6 inches. Probe depths in the crushed ranged from about 1 to 2 inches. Based on our observations and evaluations, it is our opinion that the backfill • co.- evaluated today has been placed and compacted in general accordance with , •-- -~� .r those portions of the plans and specifications that pertain to our services. �R' construction activities. were as follows. wall. The fill soils in the work. Backfilling work in this area consist of being compacted with a probe rod. The probe rock backfill typically •• - • • , • ;R 0 THIS FIELD REPORT IS PRELIMINARY A preliminary report is provided solely as evidence that field observation was performed. Observations and/or conclusions and/or recommendations conveyed in the final report may vary from and shall take precedence over those indicated in a preliminary report. FIELD REPRESENTATIVE DATE Jon C. Koloski 03-1-19 V THIS FIELD REPORT IS FINAL A final report is an instrument of professional service. Any conclusions drawn from this report should be discussed with and evaluated by the professional involved. REVIEWED BY DATE Nancy L Tochko 03-11-2019 This report presents opinions formed as a result of our observation of activities relating to our services only. We rely on the contractor to comply with the plans and specification throughout the duration of the project irrespective of the presence of our representative. Our work does not include supervision or direction of the work of others. Our firm will not be responsible for job or site safety of others an this protect DISCLAIMER:Any electronic form, facsimile or hard copy of the original document (email, text, table, and/orfigure), if provided, and any attachments are only a copy of the original document. The original documentis stored by GeoEngineers, Inc. and will serve as the official document of record. Attachments: Distribution: Sellen 00-T10-6£08 '0N al!: GEOENGINEERS...0 8410 154th Avenue NE Redmond, WA 98052 425.861.6000 Field Report File Number: 8039-010-03 Project: Museum of Flight B 52 foundations Date: 3/4/19 Owner: Museum of Flight Time of Arrival: 1100 Report Number: FR -6 Prepared by: Jon C. Koloski Location: Tukwila, WA Time of Departure: 1130 Page: 1 of 1 Purpose of visit: Construction Observation Weather: Sunny, —40 °F Travel time: 1.25 Permit Number: Upon arrival to the site I assessed personal safety hazards: 0 Yes or ® Referred to Site Safety Plan and Safety Tailgate if applicable Safety Hazards Were Addressed by : ® Staying Alert to Construction and Equipment Hazards 0 Other (describe) A site visit was made today at the request of Eric Haubrich with Sellen Construction to observe ongoing construction activities. While on site we met with Eric (Sellen) and with Dan with GMCC (earthwork contractor). Our observations were as follows. Backfill Evaluation U- 1 - We observed the contractor had placed and compacted fill adjacent to the poured landscape wall. The fill soils in this area consist of silty ! r:' , ,'j , fine sand onsite soils generated from the foundation excavation work `' .. The fill had been placed in loose lifts about 10 inches thick and had !"717, "'-. , - , `- been compacted with a jumping jack compactor. The backfill was . + `. evaluated by probing with a 1/2 inch diameter steel probe rod. The probe depths in the native soil backfill typically ranged from about 4_ to 6 inches. `° I Based on our observations and evaluations, it is our opinion that the backfill evaluated today has been placed and compacted in general accordance with those portions of the plans and specifications that L. pertain to our services. Si I, 0 THIS FIELD REPORT IS PRELIMINARY A preliminary report is provided solely as evidence that field observation was performed. Observations and/or conclusions and/or recommendations conveyed in the final report may vary from and shall take precedence over those indicated in a preliminary report. FIELD REPRESENTATIVE DATE Jon C. Koloski 03-4-19 V THIS FIELD REPORT IS FINAL Afinal report is an instrument of professional service. Any conclusions drawn from this report should be discussed with and evaluated bythe professional Involved. REVIEWED BY DATE Nancy L Tochko 03-11-2019 This report presents opinions formed as a result ofourobservationofactivities relatingtoourseMcesonly. We rely on the contractor to comply with the plans and specification througooutthedurationofthe projectinespectiveof the presence ofourrepresentative. Ourworkdoes notincludesupervislonordirectionoftheworkofothers. Ourfinnwillnotberesponslbleforjoborsitesafetyofothersanthisproject DISCLAIMER: Any electronic fonn, facsimile or hard copy of theoriginal document (email, text, table, and/orfigure), if provided, and any attachments are onlya copy of the odgnal document. The origina I document is stored by GeoEngineers, Inc. and will serve as the official documentof record. Attachments: Distribution: Sellen IIlk v oa m N 00-1Z0-6£08 'ON ally GEOENGINEER_O 8410 154th Avenue NE Redmond, WA 98052 425.861.6000 Field Report File Number: 8039-010-03 Project: Museum of Flight B 52 foundations Date: 3/19/19 Owner: Museum of Flight Time of Arrival: 1145 Report Number: FR -7 Prepared by: Jon C. Koloski Location: Tukwila, WA Time of Departure: 1215 Page: 1 of 1 Purpose of visit: Construction Observation Weather: Sunny, —70°F Travel time: 1.25 Permit Number: Upon arrival to the site I assessed personal safety hazards: 0 Yes or ® Referred to Site Safety Plan and Safety Tailgate if applicable Safety Hazards Were Addressed by : ® Staying Alert to Construction and Equipment Hazards 0 Other (describe) A site visit was made today at the request of Eric Haubrich with Sellen While on site we met with GMCC (earthwork contractor). Our observations Subgrade Evaluation We observed the contractor had completed footing subgrade preparation the plane. We understand the foundations had been excavated to areas had been backfilled prior to our arrival with 11/4 minus crushed inches thick and had been compacted with a jumping jack compactor. with a 1 inch diameter steel probe rod. The probe depths were typically Based on our observations and evaluations, it is our opinion that the general accordance with those portions of the plans and specifications .w t r � f ' . . t 4, ., ' Construction were as work for about 18 inches rock. The backfill The crushed less than footing subgrades that pertain ii ►- ; to observe ongoing follows. a small brace structure below bottom of had been placed rock backfill was evaluated 1 inch. evaluated today to our services. y�1ll '4..:. - construction activities. under the wings of footing. The excavated in loose lifts about 10 today by probing has been prepared in - O THIS FIELD REPORT IS PRELIMINARY A preliminary report is provided solely as evidence that field observation was performed. Observations and/or conclusions and/or recommendations conveyed in the final report may vary from and shall take precedence over those indicated in a preliminary report. FIELD REPRESENTATIVE DATE Jon C. Koloski 03-19-19 4 THIS FIELD REPORT IS FINAL A final report is an instrument of professional service. Any conclusions drawn from this report should be discussed with and evaluated by the professional involved. REVIEWED BY DATE Nancy L Tochko 03-26-2019 This report presents opinions fonned as a result of our observation of activities relating to our services only. We rely on the contractor to comply with the plans and specification throughout the duration of the project irrespective of the presence of our representative. Our work does not include supervision or direction of the work of others. Ourfinn will not be responsible forjob or site safety of others en this project DISCLAIMER:Any electronic form, facsimile or hard copy of the original document (email, text, table, and/orfigure), if provided, and any attachments are only a copy of the original document. The original documentis stored by GeoEngineers, Inc. and will serve as the official document of record. Attachments: Distribution: Sellen 00 -TIO -6£08 '0N al!: APPENDIX A FIELD EXPLORATIONS Subsurface conditions at the site were explored on January 8, 2016 by advancing two borings (B-1 and B-2) at the approximate locations shown on Figure 2. The approximate exploration locations were established in the field by measuring distances from existing site features. The borings were completed to depths ranging from 31.5 to 41.5 feet using mini -track drilling equipment, owned and operated by Geologic Drill of Nine Mile Falls, Washington. The borings were continuously monitored by a geotechnical engineer from our firm who examined and classified the soils encountered, obtained representative soil samples, and observed groundwater conditions. Our representative maintained a detailed log of each boring. Disturbed samples of the representative soil types were obtained using a 2 -inch outside diameter standard penetration test (SPT) split -spoon sampler. One soil sample in each boring were obtained with a California sampler with a 3 -inch outside diameter as a larger sample. The soils encountered in the test borings were typically sampled at 5 -foot vertical intervals with the SPT split -spoon sampler through the full depth of the explorations. SPT sampling was performed using a 2 -inch outside -diameter split -spoon sampler driven with a standard 140 -pound hammer in accordance with ASTM D 1586, with the exception of where the California sampler was used. During the test, a sample is obtained by driving the sampler 18 inches into the soil with a hammer free -falling 30 inches. The number of blows required for each 6 inches of penetration is recorded. The Standard Penetration Resistance ("N -value") of the soil is calculated as the number of blows required for the final 12 inches of penetration (blows/foot). This resistance, or N -value, provides a measure of the relative density of granular soils and the relative consistency of cohesive soils. If the high penetration resistance encountered in the very dense soils precluded driving the total 18 -inch sample interval, the penetration resistance for the partial penetration is entered on logs as follows: if the penetration is greater than 6 inches and less than 18 inches, then the number of blows is recorded over the number of inches driven; 30 blows for 6 inches and 50 blows for 3 inches, for instance, would be recorded as 80/9 -inch. The blow counts are shown on the boring logs at the respective sample depths. The SPT is a useful quantitative tool from which soil density/consistency was evaluated. Soils encountered in the borings were classified in the field in general accordance with ASTM D 2488, the Standard Practice for Classification of Soils, Visual -Manual Procedure, which is summarized in Figure A-1. The boring log symbols are also described in Figure A-1, and logs of the borings are provided as Figures A-2 and A-3. GEOENGINEERSQ February 5, 2016 Page A-1 File No. 8039-010-02 SOIL CLASSIFICATION CHART MAJOR DIVISIONS SYMBOLS TYPICAL DESCRIPTIONS GRAPH LETTER COARSE GRAINED SOILS MORE THAN 50% RETAINED ON NO. 200 SIEVE GRAVEL AND GRAVELLY SOILS MORE THAN 50% OF COARSE FRACTION RETAINED ON NO. 451EVE CLEAN GRAVELS (LITTLE OR NO FINES) o�U< 0 1r3° ° ) n GW WELL -GRADED GRAVELS, GRAVEL - SAND MIXTURES D 0 0 O O C o o o 0 GP POORLY -GRADED GRAVELS, GRAVEL - SAND MIXTURES GRAVELS WITH FINES (APPRECIABLE AMOUNT OFFINES) Topsoil/ Forest Duff/Sod c d GM SILTY GRAVELS, GRAVEL -SAND -SILT MIXTURES liPC O 0 2 GC MYDE.Y GRAVELS, GRAVEL - SAND -CLAY MIXTURES SAND AND SANDY SOILS MORE THAN 50% OF COARSE FRACTION PASSING NO. 4 SIEVE CLEAN SANDS (LPI'TLE OR NO FINES) ........... SW WELL -GRADED SANDS, GRAVELLY SANDS SP POORLY -GRADED SANDS, GRAVELLY SAND SANDS WITH FINES (APPRECIABLE AMOUNT OF FINES) SM SILTY SANDS, SAND - SILT MIXTURES .SC CLAYEY SANDS, SAND - CLAY MIXTURES FINE GRAINED SOILS MORE THAN 50% PASSING NO. 200 SIEVE SILTS AND CLAYS LIQUID LIMIT LESS THAN 50 ML INORGANIC SILTS, ROCK FLOUR, CLAYEY SILTS WITH SLIGHT PLASTICITY /� CL INORGANIC CLAYS OF LOW TO MEDIUM PLASTICITY, GRAVELLY CLAYS, LEAN CLAYS S, SILTY No OL ORGANIC SILTS AND ORGANIC SILTY CLAYS OF LOW PLASTICITY SILTS CLAYS LIQUID LIMIT GREATER THAN 50 MH INORGANIC. SILTS, MICACEOUS OR DIATOMACEOUS SILTY SOILS //I i ` j CH INORGANIC CLAYS OF HIGH PLASTICITY v��n..A-A OH ORGANIC CLAYS AND SILTS OF MEDIUM TO HIGH PLASTICITY HIGHLY ORGANIC SOILS PEAT, HUMUS, SWAMP SOILS WITH HIGH ORGANIC CONTENTS == = = PT NOTE: Multiple symbols are used to indicate borderline or dual soil classifications LI • 11 Sampler Symbol Descriptions 2.4 -inch I.D. split barrel Standard Penetration Test (SPT) Shelby tube Piston Direct -Push Bulk or grab Continuous Coring Blowcount is recorded for driven samplers as the number of blows required to advance sampler 12 inches (or distance noted). See exploration log for hammer weight and drop. A "P" indicates sampler pushed using the weight of the drill rig. A "WOH" indicates sampler pushed using the weight of the hammer. ADDITIONAL MATERIAL SYMBOLS SYMBOLS TYPICAL DESCRIPTIONS GRAPH LETTER AC Asphalt Concrete CC Cement Concrete CR Crushed Rock/ Quarry Spalls TS Topsoil/ Forest Duff/Sod Groundwater Contact Measured groundwater level in exploration, well, or piezometer Measured free product in well or piezometer Graphic Log Contact Distinct contact between soil strata /Approximate contact between soil strata Material Description Contact Contact between geologic units %F %G AL CA CP CS DS HA MC MD OC PM PI PP PPM SA TX UC VS NS SS MS HS NT Contact between soil of the same geologic unit Laboratory / Field Tests Percent fines Percent gravel Atterberg limits Chemical analysis Laboratory compaction test Consolidation test Direct shear Hydrometer analysis Moisture content Moisture content and dry density Organic content Permeability or hydraulic conductivity Plasticity index Pocket penetrometer Parts per million Sieve analysis Triaxial compression Unconfined compression Vane shear Sheen Classification No Visible Sheen Slight Sheen Moderate Sheen Heavy Sheen Not Tested NOTE: The reader must refer to the discussion in the report text and the logs of explorations for a proper understanding of subsurface conditions. Descriptions on the logs apply only at the specific exploration locations and at the time the explorations were made; they are not warranted to be representative of subsurface conditions at other locations or times. i KEY TO EXPLORATION LOGS GEOENGINEERS FIGURE A-1 l?n„ r17/1R te/LibTem018le:GEOENGIN Date:2/4/16 Path:P:\B\8039010\GINT803901002 LOGS.GP Start End Drilled 1/8/2016 1/8/2016 Total 31.5 Depth (ft) Logged By CDL Checked By NLT Driller Geologic Drill, Inc. Drilling Hollow -Stem Auger Method • Surface Elevation (ft) Vertical Datum Undetermined Hammer Data Rope & Cathead 300 (lbs) / 30 (in) Drop Drilling Equipment Mini Track Drill Easting (X) Northing (Y) System Datum Notes: • Groundwater Date Measured Depth to Water (ftl Elevation (ftt FIELD DATA Graphic Log Group Classification MATERIAL DESCRIPTION Moisture Content, .2 p a 2' U oa ` REMARKS Elevation (feet) Depth (feet) Interval Recovered (in) 75 o m Collected Sample Sample Name Testing Water Level 18 10 34' 6 15 8 21 9 F 2 AA 3B 4 5 %F 6 7- SM Gray silty sand with gravel and trace organics - (loose to medium dense, moist) (fill) - _ 11 35 29 %F=30 `Blow count not representative - used sampler AL (non -plastic) %F=4 o u, o cn oI <n ir1 1 1 1 1 1 1 1 1 I I 1 I 1 1 2 15 3 18 18 SM Gray to brown silty fine to medium sand (medium dense, wet) (fill?) ML Gray silt with occasional sand (medium stiff, wet) _ EP SM _ Black fine to medium sand (loose to medium dense, wet) With occasional thin layers of silt Trace wood fibers Black silty fine sand (medium dense, wet) — Note: See Figure A-1 for explanation of symbols. • o • Log of Boring B-1 GEOENGINEERS • Project: Museum of Flight B-52 Foundation Project Location: Tukwila, Washington Project Number: 8039-010-02 Figure A-2 Sheet 1 of 1 Start End 1/8/2016 Total 41.5 Depth (ft) Logged By CDL Checked By NLT Driller Geologic Drill, Inc. , Drilling Hollow -Stem Auger Method Drilled 1/8/2016 Surface Elevation (ft) Vertical Datum Undetermined Hammer Rope & Cathead Data 300 (lbs) / 30 (in) Drop Drilling Mini Track Drill Equipment Collected Sample Samole Name Testing Easting (X) Northing (Y) System Datum Groundwater Elevation (ftl Depth to pate Measured Water (ftl Notes: • Brown to gray silty fine to medium sand with i e Elevation (feet) o o N o E. o c o Depth (feet) FIELD DATA Graphic Log Group Classification MATERIAL DESCRIPTION Moisture Content, Dry Density, (pcf) REMARKS v Interval Recovered (in) w -6 o 0 m Collected Sample Samole Name Testing Water Level SM/ML Brown to gray silty fine to medium sand with - gravel and sandy silt (medium dense/stiff, - moist) (fill) _ 12 20 F - _ 13 %F=26 8 2 MC 25 SM — Black silty fine sand (loose, wet) — 5' 12 110 *Blow count not representative MD_ ML Dark gray silt with organic matter (medium stiff, - moist to wet) - 18 8 4 SM/ML Black interbedded silty fine sand and sandy silt 31 - with trace organic matter (loose/medium stiff, wet) _ SP Black fine to medium sand (loose, wet) 12 9 5 - — 1 18 17 3A - - 27 SA (%F=43) 1 16 14 7 SM Black silty fine sand (medium dense, wet) 18 16 e- _ 1 11 9 '' ML - Dark gray sandy silt (medium stiff to stiff, wet) - 1,8 9 10 = _ • Note: See Figure A-1 for explanation of symbols. o' e Log of Boring B-2 GEOENG1NEERS Project: Museum of Flight B-52 Foundation Project Location: Tukwila, Washington Project Number ° 8039-010-02 Figure A-3 Sheet 1 of 1 , APPENDIX B Laboratory Testing APPENDIX B LABORATORY TESTING Soil samples obtained from the explorations were transported to our laboratory and evaluated to confirm or modify field classifications, as well as to evaluate engineering properties of the soil samples. Representative samples were selected for laboratory testing consisting of moisture content testing, percent fines (material passing the U.S. No. 200 sieve), sieve analyses and Atterberg Limits. The tests were performed in general accordance with test methods of the American Society for Testing and Materials (ASTM) or other applicable procedures. Additional soil chemical analytical testing was completed on some of the soil samples to provide a basis for developing general recommendations for soil handling during construction. The results of this testing is provided in a separate report dated September 25, 2014. Moisture Content and Density Testing Moisture contents and/or density tests were completed in general accordance with ASTM D 2216 and D 2937 for representative samples obtained from the explorations. The results of these tests are presented on the exploration logs in Appendix A at the depths at which the samples were obtained. Percent Passing U.S. No. 200 Sieve (%F) Selected samples were "washed" through the No. 200 mesh sieve to estimate the relative percentages of coarse and fine-grained particles in the soil. The percent passing value represents the percentage by weight of the sample finer than the U.S. No. 200 sieve. These tests were conducted to verify field descriptions and to estimate the fines content for analysis purposes. The tests were conducted in accordance with ASTM D 1140, and the results are shown on the exploration logs at the respective sample depths. Sieve Analyses Full sieve analyses were performed on one selected sample in general accordance with ASTM D-422. The wet sieve analysis method was used to determine the percentage of soil greater than the U.S. No. 200 mesh sieve. The results of the sieve analyses were plotted, classified in general accordance with the USCS, and presented in Figure B-1. Atterberg Limits Atterberg limits tests were used to classify the soils as well as to help determine the consolidation characteristics of the soils. The liquid limit and the plastic limit were determined in general accordance with ASTM D 4318. The results of the Atterberg limits testing indicated that the sample tested was non -plastic. GEOENGINEERS_O February 5, 2016 Page 8-1 File No. 8039-010-02 8039-010-02 Date Exported: 01/13/16 PERCENT PASSING BY WEIGHT 100 90 80 70 60 50 40 30 20 10 0 U.S. STANDARD SIEVE SIZE 3" 1.5" 3/4" 3/8" #4 #10 #20 #40 #60 #100 #200 • 1000 100 10 1 GRAIN SIZE IN MILLIMETERS 01 0.01 0.001 COBBLES GRAVEL SAND COARSE FINE COARSE MEDIUM FINE SILT OR CLAY Symbol Boring Number Depth (feet) Moisture (%) Soil Description • B-2 20 26.9 Fine to medium sand (SP) Note: This report may not be reproduced, except in full, without written approval of GeoEngineers, Inc. Test results are applicable only to the specific sample on which they were performed, and should not be interpreted as representative of any other samples obtained at other times, depths or locations, or generated by separate operations or processes. The grain size analysis results were obtained in general accordance with ASTM D 6913. APPENDIX C Reports from OnSite and AgSource Laboratories OnSite Environmental Inc. 14648 NE 95th Street, Redmond, WA 98052 • (425) 883-3881 January 13, 2016 Nancy Tochko GeoEngineers, Inc. 8410 154th Avenue NE Redmond, WA 98052 Re: Analytical Data for Project 8039-10-02 Laboratory Reference No. 1601-039 Dear Nancy: Enclosed are the analytical results and associated quality control data for samples submitted on January 8, 2016. The standard policy of OnSite Environmental, Inc. is to store your samples for 30 days from the date of receipt. If you require longer storage, please contact the laboratory. We appreciate the opportunity to be of service to you on this project. If you have any questions concerning the data, or need additional information, please feel free to call me. Sincerely, David Baumeister Project Manager Enclosures OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. Date of Report: January 13, 2016 Samples Submitted: January 8, 2016 Laboratory Reference: 1601-039 Project: 8039-10-02 Case Narrative 2 Samples were collected on January 8, 2016 and received by the laboratory on January 8, 2016. They were maintained at the laboratory at a temperature of 2°C to 6°C. Please note that any and all soil sample results are reported on a dry -weight basis, unless otherwise noted below. General QA/QC issues associated with the analytical data enclosed in this laboratory report will be indicated with a reference to a comment or explanation on the Data Qualifier page. More complex and involved QA/QC issues will be discussed in detail below. OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. Date of Report: January 13, 2016 Samples Submitted: January 8, 2016 Laboratory Reference: 1601-039 Project: 8039-10-02 Client ID ANALYTICAL REPORT FOR SAMPLES Laboratory ID Matrix Date Sampled Date Received Notes 3 Comp - 1 Comp -2 01-039-01 01-039-02 Soil 1-8-16 1-8-16 Soil 1-8-16 1-8-16 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. Date of Report: January 13, 2016 Samples Submitted: January 8, 2016 Laboratory Reference: 1601-039 Project: 8039-10-02 TOTAL METALS EPA 6010C/7471 B 4 Matrix: Soil Units: mg/kg (ppm) Date Date Analyte Result PQL EPA Method Prepared Analyzed Flags Lab ID: 01-039-01 Client ID: Comp - 1 Arsenic ND 11 6010C 1-11-16 1-11-16 Barium 49 2.8 6010C 1-11-16 1-11-16 Cadmium ND 0.56 6010C 1-11-16 1-11-16 Chromium 35 0.56 6010C 1-11-16 1-11-16 Lead ND 5.6 6010C 1-11-16 1-11-16 Mercury ND 0.28 7471B 1-12-16 1-12-16 Selenium ND 11 6010C 1-11-16 1-11-16 Silver ND 1.1 6010C 1-11-16 1-11-16 Lab ID: Client ID: 01-039-02 Comp -2 Arsenic ND 11 6010C 1-11-16 1-11-16 Barium 43 2.8 6010C 1-11-16 1-11-16 Cadmium ND 0.56 6010C 1-11-16 1-11-16 Chromium 23 0.56 6010C 1-11-16 1-11-16 Lead ND 5.6 6010C 1-11-16 1-11-16 Mercury ND 0.28 7471B 1-12-16 1-12-16 Selenium ND 11 6010C 1-11-16 1-11-16 Silver ND 1.1 6010C 1-11-16 1-11-16 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. 5 Date of Report: January 13, 2016 Samples Submitted: January 8, 2016 Laboratory Reference: 1601-039 Project: 8039-10-02 TOTAL METALS EPA 6010C/7471 B METHOD BLANK QUALITY CONTROL Date Extracted: 1-11&12-16 Date Analyzed: 1-11&12-16 Matrix: Soil Units: mg/kg (ppm) Lab ID: MB0111 SM1 &MB0112S1 Analyte Method Result PQL Arsenic 6010C ND 10 Barium 6010C ND 2.5 Cadmium 6010C ND 0.50 Chromium 6010C ND 0.50 Lead 6010C ND 5.0 Mercury 7471B ND 0.25 Selenium 6010C ND 10 Silver 6010C ND 1.0 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. 6 Date of Report: January 13, 2016 Samples Submitted: January 8, 2016 Laboratory Reference: 1601-039 Project: 8039-10-02 TOTAL METALS EPA 6010C/7471 B DUPLICATE QUALITY CONTROL Date Extracted: 1-11 &12-16 Date Analyzed: 1-11&12-16 Matrix: Soil Units: mg/kg (ppm) Lab ID: 01-039-01 Sample Duplicate Analyte Result Result RPD PQL Flags Arsenic ND ND NA 10 Barium 43.0 44.2 3 2.5 Cadmium ND ND NA 0.50 Chromium 31.0 36.6 17 0.50 Lead ND ND NA 5.0 Mercury ND ND NA 0.25 Selenium ND ND NA 10 Silver ND ND NA 1.0 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. 7 Date of Report: January 13, 2016 Samples Submitted: January 8, 2016 Laboratory Reference: 1601-039 Project: 8039-10-02 TOTAL METALS EPA 6010C/7471 B MS/MSD QUALITY CONTROL Date Extracted: 1-11&12-16 Date Analyzed: 1-11&12-16 Matrix: Soil Units: mg/kg (ppm) Lab ID: 01-039-01 Spike Percent Percent Analyte Level MS Recovery MSD Recovery RPD Flags Arsenic 100 96.5 97 97.1 97 1 Barium 100 153 110 151 108 1 Cadmium 50.0 52.7 105 53.0 106 1 Chromium 100 134 103 132 101 2 Lead 250 262 105 261 104 0 Mercury 0.500 0.455 91 0.451 90 1 Selenium 100 105 105 106 106 1 Silver 25.0 21.0 84 21.5 86 2 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. 8 Date of Report: January 13, 2016 Samples Submitted: January 8, 2016 Laboratory Reference: 1601-039 Project: 8039-10-02 % MOISTURE Date Analyzed: 1-11-16 Client ID Lab ID % Moisture Comp - 1 01-039-01 11 Comp - 2 01-039-02 10 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 Thus report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. 9 OnSite Environmental Inc. Data Qualifiers and Abbreviations A - Due to a high sample concentration, the amount spiked is insufficient for meaningful MS/MSD recovery data. B - The analyte indicated was also found in the blank sample. C - The duplicate RPD is outside control limits due to high result variability when analyte concentrations are within five times the quantitation limit. E - The value reported exceeds the quantitation range and is an estimate. F - Surrogate recovery data is not available due to the high concentration of coeluting target compounds. H - The analyte indicated is a common laboratory solvent and may have been introduced during sample preparation, and be impacting the sample result. I - Compound recovery is outside of the control limits. J - The value reported was below the practical quantitation limit. The value is an estimate. K - Sample duplicate RPD is outside control limits due to sample inhomogeneity. The sample was re -extracted and re -analyzed with similar results. L - The RPD is outside of the control limits. M - Hydrocarbons in the gasoline range are impacting the diesel range result. M1 - Hydrocarbons in the gasoline range (toluene-napthalene) are present in the sample. N - Hydrocarbons in the lube oil range are impacting the diesel range result. N1 - Hydrocarbons in diesel range are impacting lube oil range results. O - Hydrocarbons indicative of heavier fuels are present in the sample and are impacting the gasoline result. P - The RPD of the detected concentrations between the two columns is greater than 40. Q - Surrogate recovery is outside of the control limits. S - Surrogate recovery data is not available due to the necessary dilution of the sample. T - The sample chromatogram is not similar to a typical U - The analyte was analyzed for, but was not detected above the reported sample quantitation limit. U1 - The practical quantitation limit is elevated due to interferences present in the sample. V - Matrix Spike/Matrix Spike Duplicate recoveries are outside control limits due to matrix effects. W - Matrix Spike/Matrix Spike Duplicate RPD are outside control limits due to matrix effects. X - Sample extract treated with a mercury cleanup procedure. X1- Sample extract treated with a Sulfuric acid/Silica gel cleanup procedure. Y - The calibration verification for this analyte exceeded the 20% drift specified in method 8260C, and therefore the reported result should be considered an estimate. The overall performance of the calibration verification standard met the acceptance criteria of the method. Z - ND - Not Detected at PQL PQL - Practical Quantitation Limit RPD - Relative Percent Difference OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. m 0 Pi" 0 SD, v 0 o Cl Reviewed/Date m 00 0 N m 5 .0 c. a m O. Relinquished m 0 0 Relinquished ..r. 'Lab ID Sample Identification cn w 3 Project Manage Nwv1 c 1 To6,1, 1 Project Name: Project Number: Company: G• r•N,n..e-d Analytical Laboratory Testing Services 14648 NE 95th Street • Redmond, WA 98052 Phone: (425) 883-3881 • www.onsite-env.com 1 ,— 0 � 1.4 C f 0.cs .. o t— 5 \\•.,--e ll fi I�fr Y Ili / ir l' 1. " --t.3 n m d c Fo a (Check One) ❑ Same Day ❑ 1 Day ❑ 2 Days ❑ 3 Days Standard (7 Days) (TPH analysis 5 Days) (other) Turnaround Request (In working days) Reviewed/Date h �►� G Sr Company O Q 0 0 O 3 A m — -- Number of Containers NWTPH-HCID Laboratory Number: Q 1 Q 3 9 l — � C _o d :o NWTPH-Gx/BTEX NWTPH-Gx NWTPH-Ox ftss, fi6 CHalogenated Ce%I N 417 3 Volatiles 8260C Volatiles 8260C Semivolatiles 8270D/SIM (with low-level PAHs) Chromatograms with final report Comments/Special I PAHs 8270D/SIM (low-level) PCBs 8082A Organochlorine Pesticides 80818 Organophosphorus Pesticides 8270D/SIM v a `i, H Chlorinated Acid Herbicides 8151A x X Total RCRA Metals Total MTCA Metals TCLP Metals HEM (oil and grease) 1664A jK x 96 Moisture m 0 m 0 _ CCr D. i73 3 () P. • E • m d r�, ((DD 12- ▪ o o a3 d 9: co 3 co 3 C C .� N 0 0 3 � O -g a • 01 iiT �y • 3 w g- m - 73 O O_ • N 0. 0 o 0 .► (D S C. (D 0 • a. • k" Fir o 0 O1 — 0. ET 3" O 54) o C 3 D 0 • 0 0 0 0 0 N 0 N Of Of " 9 N V = V A AV O 0 3 0 o 0 c 0 0 0 < 0 co A 3 O r 9 to m co 3v ' N + � S-4 P 3 A 0 V a 0/ 0 0 o 000 coo .0 of -0 a y w o 6 z p m w 0 3 A .0 A W O. N C N 0 A iO 3 (1) 0) 0 C. 0c 0 o a Cr • 3 3. aois O = (3n 73 0 A 3 3 0. + o :4 3 ▪ • c P. m3 ▪ • m 0 Lg. f/1 'a 0 3 N C o it M D 3 — Of o e = 40 0 N O io N N o 0 0 0 0 A C1 o) 0 V o] N p A ▪ A x zp. 07 311SOdw00 91.02-Uef-£ 6 9602-Uef-£6 to 0 W panpoab Oleo palaodo Oleo .oN laagS uogewaolup ZS086 VM `aNOwa321 '3'N 3fN3AV H1vS6 06v8 ONI `S2133NIDN3 039 S2I33NIDN3 030 Zo860nV - 60860nV :Aq palliwgnS vPSvzDwn :aol pawwgnS # aOwes AJoleJogei kth d ea o 15 C -1 c 3 m 3 w A ^. (n N Ts N x. © io O N Q (/) C a) 4 — D A gg P N 0 3 .0 5 C) cn • 3 ,�. m • • v t N Q' NO Q 3 dat Df C1 • O co c a' <D = � y co f• (D O O • a ;" d y N C � N <D Q' 'a N O O A a.< Cr o N .. CD O. ID 0 c. ET a 3 c O • Gt d C. v 01 ~` O- •1 .► S O O 3 O N O 3 n -a CD a y C 0 f N <D 7 • N �' c a 0. < 3 m 3. Q - N eD O 0. a 0 O S N A 0 a 3 O • 0 0 0 0 0 0 0 3. 3 3 3 3 3 3 3 3 a 0 0 0 0 0 0 0 0 U) Ul cis w N N N U) m m m m m m m m uoi;eal;l;uapl eiduaeS;ue!IO O UJ U) -i —I N U) o > Q. .. C C '7 O. : K O N N If o N ch U) V N 0 X e O O O t0 e y r r c o e 0 0 o o :. 33 960Z-Uef-£L pan!aoaa a;ea papodaH alea 'ON;aags uo!;ewao;u! 29086 VM `aNOWa32l '3'N 3fN3AV H1b91. 014'8 3NI `S2133NION3 030 52133NIDN3 030 zoeionv- Lononv :iq pall!wgnS M'SPZOWn :Jo; pauiwgnS # whims fuo;eiogel O y APPENDIX D Previous Studies APPENDIX D PREVIOUS STUDIES GeoEngineers reviewed Togs of previous explorations completed in the general vicinity of the project. The locations of previous explorations are shown on the Site Plan, Figure 2. The logs of some of the previous explorations are presented in this appendix and include: ■ The logs of four borings (B-2 through B-4, and B=7) completed in 2009 by GeoEngineers in the report entitled "Geotechnical Engineering Services, Aviation High School at the Museum of Flight, Tukwila, Washington." GEOENGINEERSj February 5, 2016 Page D-1 File No. 8039-010-02 0/1/09 Path:W:\REDMOND\P • Start End Drilled 7/21/2009 7/21/2009 Total 14 Depth (ft) Logged By BPD Checked By NLT Driller Geologic Drill Drilling Hollow -stem Auger/SPT Method Surface Elevation (ft) Vertical Datum 18.0 Hammer Data Rope and Cathead 140 (lbs) / 30 (in) Drop Drilling Equipment XL Trailer Rig Latitude Longitude System Datum N/A Notes: Auger Data: 314 inches ID, 7 inches OD Groundwater Depth to Date Measured Water (ftl 7/21/2009 11 Elevation (ftl 7.0 i Elevation (feet) Depth (feet) FIELD DATA Collected Sample a E m o ° Z y J U y 01_i U d C:ii D j 2 E lnn m A o m co - U' (7U MATERIAL DESCRIPTION REMARKS - 5 — 1 18 5 2 wet) SM Dark brown silty fine sand (loose to medium _ dense, moist) 'j ML Gray silt with trace organic matter (medium stiff - 10— _ SZ 3 Note: See Figure A-1 for explanation of symbols. SP Black fine to medium sand (medium dense, wet) 10 SA, HA, %F=27 i Log of Boring B-2 G EO E N G 1 N E E R S Project: Project Location: Project Number: Aviation High School Seattle, Washington 2820-003-00 Figure A-3 Sheet 1 of 1 , • Start End Drilled 7/21/2009 7/21/2009 Total 14 Depth (ft) Logged By BPD Checked By NLT Driller Geologic Drill Drilling Hollow -stem Auger/SPT Method • Surface Elevation (ft) Vertical Datum 18.0 Hammer Data Rope and Cathead 140 (lbs) / 30 (in) Drop Drilling Equipment XL Trailer Rig Latitude Longitude System Datum N/A Notes: Auger Data: 3% inches ID, 7 inches OD • Groundwater Depth to Date Measured Water (ftl 7/21/2009 7 Elevation (ftl 11.0 i i Elevation (feet) o Depth (feet) FIELD DATA Z c Recovered (in) Water Level c 0 J (p U U .c0. y a =y 2 o ,p O o o MATERIAL DESCRIPTION REMARKS 51 (0 10 — 18 17 1 18 8 2 18 4 3 4 SM Dark brown silty fine to coarse sand with lenses of sandy silt (medium dense, moist) • ML Grayish black silt with sand and occasional wood fragments (medium stiff to stiff, moist) _ Grades to gray and wet Z. Note: See Figure A-1 for explanation of symbols. SP -SM Black fine sand with lenses of silt (medium dense, wet) 10 SA, %F=29 • i Log of Boring B-3 \ G EO E N G I N E E R J,.d/ Project: Aviation High School Project Location: Seattle, Washington Project Number: 2820-003-00 Figure A-4 Sheet 1 of 1 0 Start End Total Depth (ft) 14 Logged BPD Checked By NLT Driller Geologic Drill • •By Melthod Hollow -stem Auger/SPT Drilled 7/21/2009 7/21/2009 Surface Elevation (ft) Vertical Datum 19.0 Hammer Rope and Cathead Data 140 (lbs) / 30 (in) Drop Drilling Equipment XL Trailer Rig Latitude Longitude System N/A Datum Groundwater Depth to Date Measured Water (ft) Elevation (ftl Notes: Auger Data: 3% inches ID, 7 inches OD ♦ 7/21/2009 6 13.0 , FIELD DATA Graphic Log Group Classification MATERIAL DESCRIPTION Moisture I Content, m C c - REMARKS 11111111111111 Z5' '° 'S Elevation (feet) o o Depth (feet) i i I immii i i Iiiiiiii ' Interval c Recovered (in) N 0 m Collected Sample Sample Name Testing Water Level 7 2 10 1 2 3 • SM Dark reddish brown silty fine sand with chunks of silt (loose, moist) (fill) 15 SA, %F=34 ML _ Gray clayey silt with organic matter (soft, wet) SP -SM Grayish fine to medium sand with silt and lenses of clayey silt (loose to medium dense, wet) _ Note: See Figure A-1 for explanation of symbols. ♦ , Log of Boring B-4 GEOENGINEERS.g Project: Project Location: Project Number: Aviation High School Seattle, Washington 2820-003-00 Figure A-5 Sheet 1 of 1 , 3i x 0 2 0 0 E 0 8 Start End TotalLogged Depth (ft) 19 By BPD Checked By NLT Driller Geologic Drill Drillin Method Hollow -stem Auger/SPT Drilled 7/22/2009 7/22/2009 Hammer Rope and Cathead Data 140 (lbs) / 30 (in) Drop Drilling XL Trailer Rig Equipment A 2 (in) well was Well was developed Groundwater installed on 7/22/2009 to a depth of (ft). on 7/22/2009. Depth to Water ft Elevation (ft( Surface Elevation (ft) Vertical Datum 19.0 Top of Casing Elevation (ft) Latitude Longitude System Datum N/A Date Measured 8/5/2009 12.1 6.89 Notes: Auger Data: 4% inches ID, 8 inches OD to o 3• a FIELD DATA e • U m S CC 1 18 5- 10- 15 — 18 18 5 3 19 12 N E N .fl 0 u Sample Name 2 3 4 SM MATERIAL DESCRIPTION —2 inches asphalt concrete and 1Y2 -inch base course Dark brown silty fine sand with chunks of silt (fill) Brownish gray clayey silt with trace sand (soft, wet) SP -SM Dark brown fine sand with silt (medium dense, moist) SP Dark gray fine sand with trace silt (medium dense, wet) Note: See Figure A-1 for explanation of symbols. 6.0 WELL LOG locking J -plug Flush -mount steel monument /�. '/". Concrete surface seal Bentonite seal 2 -Inch Schedule 40 PVC well 4 4 casing 19.0 10-20 silica colorado sand 2 -inch Schedule 40 PVC screen, 0.02 inch slot width end cap plug Log of Monitoring Well B-7 G EO E N G I N E E RS Project: Project Location: Project Number: Aviation High School Seattle, Washington 2820-003-00 Figure A-8 Sheet 1 of 1 , APPENDIX E Report Limitations and Guidelines for Use APPENDIX E REPORT LIMITATIONS AND GUIDELINES FOR USE1 This appendix provides information to help you manage your risks with respect to the use of this report. Geotechnical Services Are Performed for Specific Purposes, Persons and Projects This report has been prepared for the exclusive use of the Museum of Flight and other project team members for the Museum's B-52 project in Tukwila, Washington. This report may be made available to prospective contractors for their bidding or estimating purposes, but our report, conclusions and interpretations should not be construed as a warranty of the subsurface conditions. This report is not intended for use by others, and the information contained herein is not applicable to other sites. GeoEngineers structures our services to meet the specific needs of our clients. For example, a geotechnical or geologic study conducted for a civil engineer or architect may not fulfill the needs of a construction contractor or even another civil engineer or architect that are involved in the same project. Because each geotechnical or geologic study is unique, each geotechnical engineering or geologic report is unique, prepared solely for the specific client and project site. Our report is prepared for the exclusive use of our Client. No other party may rely on the product of our services unless we agree in advance to such reliance in writing. This is to provide our firm with reasonable protection against open-ended liability claims by third parties with which there would otherwise be no contractual limits to their actions. Within the limitations of scope, schedule and budget, our services have been executed in accordance with our Agreement with the Client and generally accepted geotechnical practices in this area at the time this report was prepared. This report should not be applied for any purpose or project except the one originally contemplated. A Geotechnical Engineering or Geologic Report Is Based on a Unique Set of Project -Specific Factors This report has been prepared for the Museum of Flight B-52 project in Tukwila, Washington. GeoEngineers considered a number of unique, project -specific factors when establishing the scope of services for this project and report. Unless GeoEngineers specifically indicates otherwise, do not rely on this report if it was: • not prepared for you, • not prepared for your project, • not prepared for the specific site explored, or • Completed before important project changes were made. For example, changes that can affect the applicability of this report include those that affect: • the function of the proposed structure; • elevation, configuration, location, orientation or weight of the proposed structure; • composition of the design team; or • project ownership. 1 Developed based on material provided by ASFE, Professional Firms Practicing in the Geosciences; www.asfe.org . GEOENGINEERS. February 5, 2016 Page E-1 File Na. 8039-010-02 If important changes are made after the date of this report, GeoEngineers should be given the opportunity to review our interpretations and recommendations and provide written modifications or confirmation, as appropriate. Subsurface Conditions Can Change This geotechnical or geologic report is based on conditions that existed at the time the study was performed. The findings and conclusions of this report may be affected by the passage of time, by manmade events such as construction on or adjacent to the site, or by natural events such as floods, earthquakes, slope instability or groundwater fluctuations. Always contact GeoEngineers before applying a report to determine if it remains applicable. Most Geotechnical and Geologic Findings Are Professional Opinions Our interpretations of subsurface conditions are based on field observations from widely spaced sampling locations at the site. Site exploration identifies subsurface conditions only at those points where subsurface tests are conducted or samples are taken. GeoEngineers reviewed field and laboratory data and then applied our professional judgment to render an opinion about subsurface conditions throughout the site. Actual subsurface conditions may differ, sometimes significantly, from those indicated in this report. Our report, conclusions and interpretations should not be construed as a warranty of the subsurface conditions. Geotechnical Engineering Report Recommendations Are Not Final Do not over -rely on the preliminary construction recommendations included in this report. These recommendations are not final, because they were developed principally from GeoEngineers' professional judgment and opinion. GeoEngineers' recommendations can be finalized only by observing actual subsurface conditions revealed during construction. GeoEngineers cannot assume responsibility or liability for this report's recommendations if we do not perform construction observation. Sufficient monitoring, testing and consultation by GeoEngineers should be provided during construction to confirm that the conditions encountered are consistent with those indicated by the explorations, to provide recommendations for design changes should the conditions revealed during the work differ from those anticipated, and to evaluate whether or not earthwork activities are completed in accordance with our recommendations. Retaining GeoEngineers for construction observation for this project is the most effective method of managing the risks associated with unanticipated conditions. A Geotechnical Engineering or Geologic Report Could Be Subject to Misinterpretation Misinterpretation of this report by other design team members can result in costly problems. You could lower that risk by having GeoEngineers confer with appropriate members of the design team after submitting the report. Also retain GeoEngineers to review pertinent elements of the design team's plans and specifications. Contractors can also misinterpret a geotechnical engineering or geologic report. Reduce that risk by having GeoEngineers participate in pre-bid and preconstruction conferences, and by providing construction observation. GEOENGINEERS� February 5, 2016 Page E-2 File No. 8039-010-02 Do Not Redraw the Exploration Logs Geotechnical engineers and geologists prepare final boring and testing logs based upon their interpretation of field logs and laboratory data. To prevent errors or omissions, the logs included in a geotechnical engineering or geologic report should never be redrawn for inclusion in architectural or other design drawings. Only photographic or electronic reproduction is acceptable, but recognize that separating logs from the report can elevate risk. Give Contractors a Complete Report and Guidance Some owners and design professionals believe they can make contractors liable for unanticipated subsurface conditions by limiting what they provide for bid preparation. To help prevent costly problems, give contractors the complete geotechnical engineering or geologic report, but preface it with a clearly written letter of transmittal. In that letter, advise contractors that the report was not prepared for purposes of bid development and that the report's accuracy is limited; encourage them to confer with GeoEngineers and/or to conduct additional study to obtain the specific types of information they need or prefer. A pre-bid conference can also be valuable. Be sure contractors have sufficient time to perform additional study. Only then might an owner be in a position to give contractors the best information available, while requiring them to at least share the financial responsibilities stemming from unanticipated conditions. Further, a contingency for unanticipated conditions should be included in your project budget and schedule. Contractors Are Responsible for Site Safety on Their Own Construction Projects Our geotechnical recommendations are not intended to direct the contractor's procedures, methods, schedule or management of the work site. The contractor is solely responsible for job site safety and for managing construction operations to minimize risks to on-site personnel and to adjacent properties. Read These Provisions Closely Some clients, design professionals and contractors may not recognize that the geoscience practices (geotechnical engineering or geology) are far less exact than other engineering and natural science disciplines. This lack of understanding can create unrealistic expectations that could lead to disappointments, claims and disputes. GeoEngineers includes these explanatory "limitations" provisions in our reports to help reduce such risks. Please confer with GeoEngineers if you are unclear how these "Report Limitations and Guidelines for Use" apply to your project or site. Geotechnical, Geologic and Environmental Reports Should Not Be Interchanged The equipment, techniques and personnel used to perform an environmental study differ significantly from those used to perform a geotechnical or geologic study and vice versa. For that reason, a geotechnical engineering or geologic report does not usually relate any environmental findings, conclusions or recommendations; e.g., about the likelihood of encountering underground storage tanks or regulated contaminants. Similarly, environmental reports are not used to address geotechnical or geologic concerns regarding a specific project. GEOENGINEERSi February 5, 2016 Page E-3 File No. 8039-010-02 Biological Pollutants GeoEngineers' Scope of Work specifically excludes the investigation, detection, prevention or assessment of the presence of Biological Pollutants. Accordingly, this report does not include any interpretations,' recommendations, findings, or conclusions regarding the detecting, assessing, preventing or abating of Biological Pollutants and no conclusions or inferences should be drawn regarding Biological Pollutants, as they may relate to this project. The term "Biological Pollutants" includes, but is not limited to, molds, fungi, spores, bacteria, and viruses, and/or any of their byproducts. If Client desires these specialized services, they should be obtained from a consultant who offers services in this specialized field. GEOENGINEERS February 5, 2016 Page E-4 File No. 8039-010-02 Have we delivered World Class Client Service? Please let us know by visiting www.geoengiineers.com/feedback. GEOENGINEER1 MOF_B-52 Additional Response Information 4a. https://northwestmeadowscapes.com/pages/pacific-crabapple-project http://emerald.npsoregon.org/NGAPguides/NativeTreesBooklet.pdf Pacific Crabapple - Maus litsca (iyr is fusca) Pacific crabapple is a sturdy native tree with attractive, fragrant flowers that look very similar to the flowers of domesticated apple. In the fall, look for its berry -sized, yellow -to -red, tart fruit,. In the wild, it grows primarily in wet but sunny conditions. Pacific crabapple can grow either into a large 8- to 10 -foot, multi -stemmed shrub or into a 15- to 23 -foot tree. It can be planted on a wide variety of sites from standing water to well drained soils, For rapid growth and for fruit and flower production, this tree should receive at least 3 to 4 hours of sunlight each day. Pacific crabapple is generally drought tolerant within a year or two of planting. To best appreciate this trees fra- grant flowers, colorful fruit, and showy fall foliage, it should be planted as an individual specimen in a visible loca- tion, To achieve a treelike habit, it may be necessary initially to prune the plant into a tree shape with from one to three trunks. This trees durability and robust growth also makes it well suited for mixed hedges and wildlife areas, The prettyfierwersofPacific eramppie 1 We have no concerns about the suitability of Malus fusca on this site, especially given that this is an irrigated landscape. CORRECTIONLTR#1 +o REVISION N0, in- °WYO. • REC !VE YOF`�lEalLP NUV 28 2018 PERMIT CENTER 1 MOF_B-52 Additional Response Information 4b. https://landscapeplants.oregonstate.edu/plants/rhamnus-purshiana http://urbanforestnursery.com/inventory/tree-profiles/cascara/ College of Agricultural Sciences Deportment of Horticulture tt Landscape Plants Abc t Latin Names Common Nacres Wood, 'lint Search • ?.cortioral Info-ma:ion • Rhamnus purshiana Common name: Cascara Chittam Cascara Buckthorn Pronunciation: RAM -nus PURSH-i-an-a Family. Rhamnaceae - Genus: Rhamnus Synonyms: R. purshianus Type: Broadleaf Native to (or naturalized In) Oregon: Yes t Deciduous tree to 50 ft (15 m) tall, or an erect shrub 15 ft (4.5 ml tall; twigs soft and velvety pubescent at first; buds naked (without scales), 13 mm long, in 2-3 exposed segments, with rusty pubescence. Leaves alternate, simple, elliptic to oblong or ovate, 5-15 cm long, flat, round base, abruptly pointed apex, 10-15 conspicuous parallel veins, sparsely serrate or entire, dark green above, lighter below; fall color depending upon sun exposure and varies from pure yellow (shadelto yellow mixed with orange, red, and purple. Flowers small, green -white, sepals, petals, and stamens in 55, in clusters. Fruit 8 mm diameter, purplish -black, sickly sweet taste. Sun or shade. Best in moist, well -drained soils. + Hardy to USDA Zone 3b Native range from British Columbia south on the west side of the Cascade Mountains to lower California, east through Idaho to western Montana. The cured bark Is used as a mild laxative. purshiana; after Frederick T. Pursh (1774-1820), a German/U.S. botanist, one of the most important early North American plant collectors. Oregon State Univ., Peavy Arboretum, Arboretum Road. + Corvallis: northwest corner of Cloverland Park (Arthur and 29th St.) MOF_B-52 Additional Response Information 4a. https://northwestmeadowscapes.com/pages/pacific-crabapple-project http://emerald.npsoregon.org/NGAPguides/NativeTreesBooklet.pdf Pacific Crabapple - Maims fusca (Pyres *ca./ Pacific crabapple is a sturdy native tree with attractive, fragrant flowers that look very similar to the flowers of domesticated apple. In the fall, look for its berry -sized, yellow -to -red, tart fruit. In the wild, it grows primarily in wet but sunny conditions. Pacific crabapple can grow either into a large 8- to 1U -foot, multi -stemmed shrub or into a 15- to 25 -foot tree, It can be planted on a wide variety of sites from standing water to well drained soils, For rapid growth and for fruit and flower production, this tree should receive at least 3 to 4 hours of sunlight each day. Pacific crabapple is generally drought tolerant within a year or two of planting. To best appreciate this tree's fra- grant flowers, colorful fruit, and showy fall foliage, it should be planted as an individual specimen in a visible loca- tion, To achieve a treelike habit, it may be necessary initially to prune the plant into .a tree shape with from one to three trunks. This tree's durability and robust growth also makes it well suited for mixed hedges and wildlife areas, The pirily flowersofPacific a We have no concerns about the suitability of Malus fusca on this site, especially given that this is an irrigated landscape. REVIEWED FOR CODE COMPLIANCE APPROVED DEC 12 2018 City of Tukwila BUILDING DIVISION CORRECTION LTR# i +o REVISION NO; tIProR RECEIVED CITY OF TUKWILA NOV 2 8 2018 PERMIT CENTER • MOF_B-52 Additional Response Information 4b. https://landscapeplants.oregonstate.edu/plants/rhamnus-purshiana http://urbanforestnursery.com/inventory/tree-profiles/cascara/ College of Agnculturdl Sciences - Department of Horticulture rr Landscape Plants About Calm Names Common Nacres Woody Plant Search • Additional Information • Rhamnus purshiana Common name: Cascara Chittam Cascara Buckthorn Pronunciation: RAM -nus PURSH-i-an-a Family. Rhamnaceae Genus: Rhomnus Synonyms: R. purshianus Type: Broadleaf Native to (or naturalized in) Oregon: Yes r Deciduous tree to 50 ft (15 m) tall, or an erect shrub 15 ft (4.5 m) tall; twigs soft and velvety pubescent at first; buds naked (without scales), 13 mm long, in 2-3 exposed segments, with rusty pubescence. Leaves alternate, simple, elliptic to oblong or ovate, 5-15 cm long, flat, round base, abruptly pointed apex, 10-15 conspicuous parallel veins, sparsely serrate or entire, dark green above, lighter below; fall color depending upon sun exposure and varies from pure yellow (shade)to yellow mixed with orange, red, and purple. Flowers small, green -white, sepals, petals, and stamens in 5s, in clusters. Fruit 8 mm diameter, purplish•black, sickly sweet taste. Sun or shade. Best in moist, well -drained soils. r Hardy to USDA Zone 36 Native range from British Columbia south on the west side of the Cascade Mountains to lower California, east through Idaho to western Montana. the cured bark is used as a mild laxative. purhiono: after Frederick T. Pursh (17743820(, a German/U.S. botanist, one of the most important early North American plant collectors. ) Oregon State Univ., Peavy Arboretum, Arboretum Road. r Corvallis: northwest corner of Cloverland Park (Arthur and 29th St.) RECEIVED OCT 2 4 2018 TUKWILA PUBLIC WORKS STORMWATER TECHNICAL INFORMATION REPORT B-52 Memorial Park Phase 2 Tukwila, Washington REVIEWED FOR CODE COMPLIANCE APPROVED DEC 12 2018 City of Tukwila BUILDING DIVISION October 22, 2018 CORRECTION 40 REVISION N0: _1. Ancl REVISION.NO__2. RECEIVED CITY OF TUKWILA OCT 2 3 2018 PERMIT CENTER ■ MAGNUSSON KLEMENCIC ASSOCIATES 1301 Fifth Avenue, Suite 3200 Seattle, Washington 98101-2699 T: 206 292 1200 F: 206 292 1201 � b- 0088 MAGNUSSON I KLEMENCIC ASSOCIATES ■ SECTION 1: PROJECT OVERVIEW SECTION 2: CONDITIONS AND REQUIREMENTS SUMMARY SECTION 3• OFF-SITE ANALYSIS SECTION 4: FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN •► •1 SECTION 6: SPECIAL REPORTS AND STUDIES SPCTION 7: OTHER PERMITS SECTION 8: CONSTRUCTION STORMWATER POLLUTION PREVENTION PLAN ANALYSIS AND DESIGN SECTION 9: BOND QUANTITIES WORKSHEET, RETENTION/DETENTION FACILITY SUMMARY SHEET AND DECLARATION OF COVENANT SECTION 10: OPERATIONS AND MAINTENANCE MANUAL FIGURES APPENDIX Stormwater Technical Information Report B-52 Memorial Park Phase 1, Tukwila, Washington 1 2 4 4 5 5 5 5 9 9 Table of Contents II MAGNUSSON KLEMENCIC ASSOCIATES SECTION 1 • PROJECT OVERVIEW INTRODUCTION This report documents the stormwater and drainage design approach and proposal for the Museum of Flight (MOF) B-52 Memorial Park Phase 2 Project (Park). The report has been prepared using Chapter 5 of the City of Tukwila 2010 Infrastructure Design and Construction Standards and the 2016 King County Surface Water Design Manual (KCSWDM) as general guidelines for this abbreviated Stormwater Technical Information Report (TIR). In some cases, the information requested in the KCSWDM is specific to permitting in King County. Requested information that is directly related to work in King County has been omitted from this TIR. The project is located in the City of Tukwila directly southwest of Raisbeck Aviation High School (9229 East Marginal Way South), north of S 94th Place, in the southwestern -most portion of Parcel Number 572980-0010. See Figure 1-1 for a vicinity map showing the location of the site. The project site is currently owned by the Museum of Flight and was formerly owned by Container Properties. Work on the site will be completed in two phases. Phase 1 of the Park project, completed in Summer 2016, included the reconfiguration of the existing adjacent parking, the removal of asphalt pavement, the development of lawn areas, installation of an irrigation system, a new water service for irrigation, and the installation of a pervious gravel area for picnic tables. No significant grading was done for Phase 1. There have been no further site improvements since the completion of Phase 1. The scope of work for Phase 2 will create a landscaped area of natural vegetation, plantings, paved pathways, and a raised mound as well as a commemorative statue and flagpoles. All of these improvements are part of an exhibit for a restored B-52 aircraft. The project will also include foundations to support the aircraft, irrigation and lighting and removal of trees. The Phase 1 and 2 work were approved as a Planned Action in March 2016. Because this is a phased development, the land cover prior to the start of the Phase 1 improvements is considered the predeveloped condition for the purposes of this TIR. A copy of the TIR worksheet is provided in Appendix 1 of this report. EXISTING DRAINAGE Prior to the commencement of Phase 1, the site was entirely impervious consisting of asphalt or concrete paving and compacted soil and gravel surfacing. Aerial images dating as far back as 1990 show that this site has been impervious since at least that time. A portion of the site currently drains to an existing on-site conveyance system on the on the Raisbeck Aviation High School property. The system discharges to the Duwamish River through an existing 36 - inch outfall, owned by King County, at the northeast comer of Slip 6. This conveyance system was installed during the construction of Raisbeck Aviation High School. This conveyance system connects to an existing storm drain system that includes the King County outfall on the high school site. This system includes a water quality treatment device (StormFilter), installed by the high school project, that treats the pollution -generating impervious surfaces created by that project. The King County outfall also collects discharge from adjacent properties on the west side of East Marginal Way South as well as a portion of the runoff from the King County International Airport. Stormwater Technical Information Report B-52 Memorial Park Phase 2, Tukwila, Washington MAGNUSSON KLEMENCIC ASSOCIATES The remainder of the site has no collection or conveyance system and discharges as overland flow to the adjacent properties. The site drainage area, site characteristics, and the existing storm drain conveyance system are shown in Figure 1-2. PROPOSED DRAINAGE The Phase 1 improvements maintained the existing drainage system and catchment areas draining to the existing conveyance systems. No new conveyance systems were installed. Phase 2 will continue to maintain all existing drainage systems and there are no proposed drainage improvements. Overall peak flow rates will be reduced as a result of the reduction in impervious surfaces. SOILS King County Soil Survey maps are not available at the project site, as soils in urban areas are considered highly variable. Borings taken around the project site indicate the soils within 30 feet of the surface consist mainly of surficial fill overlying granular alluvial deposits. The geotechnical engineer has classified the fill as primarily medium -dense silty sand with some gravel, while the granular alluvial deposits consist of loose to medium -dense sand to silty sand. Based on explorations at neighboring downstream properties during Phase 1 improvements, the geotechnical engineer anticipates thicker silt layers at depths beyond 30 feet. Per the 2016 Surface Water Design Manual's Table 3.2.2.A, Tukwila is classified as SCS Hydrologic Soil Group "D," which shall be modeled as till soils. • . • . i • k SITE CONDITIONS • The site disturbance within the Phase 2 limits of work is 0.96 acres as shown on Figure 2-1. Areas of Phase 2 were previously disturbed for the Phase 1 work. • The existing pervious and impervious areas, prior to Phase 1, within the Phase 2 limits of work, are 0.06 acres and 0.90 acres respectively. See Figure 2-2. • The proposed pervious and impervious areas, after the completion of the Phase 2 work, within the Phase 2 limits of work are 0.76 acres and 0.20 acres respectively. See Figure 2-3. This represents an increase to the pervious area, and corresponding decrease to the impervious area, of 0.70 acres. • Prior to the Phase 1 work, the existing pollution -generating impervious surface area within the Phase 1 site disturbance area was 2,571 square feet (0.06 acres). All pollution -generating impervious surface areas within the site disturbance area were removed as part of the Phase 1 work. A total of 2,803 square feet of existing pollution -generating surface will be removed within the Phase 2 site disturbance area. No new pollution -generating surfaces are proposed for Phase 2. Stormwater Technical Information Report 2 B-52 Memorial Park Phase 2, Tukwila, Washington MAGNUSSON KLEMENCIC ASSOCIATES CORE REQUIREMENTS Evaluation of the project with respect to the Core and Special Requirements is outlined below. Core Requirement 1: Discharge at the Natural Location The drainage from the site disturbance area will maintain existing unconcentrated flow patterns. Flows will continue to drain to the existing off-site systems on the Container Properties site and Raisbeck Aviation High School, which eventually discharge to outfalls at the Duwamish River. Core Requirement 2: Off -Site Analysis Not applicable. The proposed development reduces the impervious surface and as a result there is no adverse change to the rate, volume, duration, or location of discharges to and from the site. Core Requirement 3: Flow Control Not applicable. The project is within the Duwamish River Basin and discharges via a closed conveyance system, with adequate capacity, to a point below River Mile 6, and is therefore exempt from the flow control requirement per the Direct Discharge Exemption. Core Requirement 4: Conveyance System There are no new conveyance systems required for this project. Existing on-site conveyance lines have not been analyzed since there is a decrease #erfhtto the peak flow rate as a result of the decrease in impervious area within the site disturbance area. Core Requirement 5: Construction Stormwater Pollution Prevention A Temporary Erosion and Sedimentation Control (TESC) plan has been prepared for the project and SWPPS measures discussed in Section 8. Core Requirement 6: Maintenance and Operation Not applicable. There is an existing water quality treatment facility outside the project limits of work on the Raisbeck Aviation High School site (see Figure] -2). Maintenance and operation of this facility is by the high school. Core Requirement 7: Financial Guarantees and Liability Not applicable. This is a requirement specifically related to work in unincorporated King County. Additionally, no drainage facilities will be constructed or modified during this project. Core Requirement 8: Water Quality There will be no new or replaced pollution -generating impervious surfaces in Phase 2. Additional water quality treatment beyond what currently exists on the high school site is not required. Pollution- Stormwater Technical Information Report 3 B-52 Memorial Park Phase 2, Tukwila, Washington MAGNUSSON KLEMENCIC ASSOCIATES ■ generating impervious surface areas were reduced as a result of the removal of asphalt paved parking areas in Phase 1 and removals proposed for Phase 2. Core Requirement 9: Flow Control BMPs The proposed development qualifies for the City of Tukwila and King County Direct Discharge Exemption; however, King County standards require that flow control gMeadjojacignied.. Because the site disturbance area is over 22,000 square feet, Targe lot BMP requirements are applicable to this project. Infiltration at this site isnot feasible; therefore, Basic Dispersion must be considered for feasibility to meet this core requirement. A minimum 10 -foot vegetative flow path is available in some areas for sheet flow from the new surfaces. Gravel strips are not required for pathways less than 10 feet wide. Surfaces where flows cannot be directed to vegetated areas via gravity are considered infeasible for Basic Dispersion. SPECIAL REQUIREMENTS Special Requirement 1: Other Adopted Area -Specific Requirements Not applicable. Special Requirement 2: Flood Hazard Area Delineation Not applicable. The project site appears on the National Flood Insurance Rate Map, dated May 16, 1995, Community Panel No. 53033C0645F, and is situated in Zone "X," an area determined to be outside the 500 -year floodplain. Special Requirement 3: Flood Protection Facilities Not applicable. There are no flood protection facilities on the project site. Special Requirement 4: Source Controls Not applicable. There will be no storage of pollutant material outdoors. Special Requirement 5: Oil Control Not applicable. The project is not a high -use site. SECTION 3- OFF-SITE ANALYSIS Not applicable per exemptions described in Section 2, Core Requirement 2. SECTION 4. FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND _ESIGAI Flow control analysis and design is not applicable. At the completion of Phase 2 the project will reduce the impervious surface within the site disturbance area. Stormwater Technical Information Report 4 B-52 Memorial Park Phase 2, Tukwila, Washington MAGNUSSON KLEMENCIC ASSOCIATES Water quality facility analysis and design is not applicable. During Phase 1, the project reduced the pollution -generating impervious surface within the site disturbance area. There are further reductions in pollution -generating surface proposed for Phase 2. SECTION 5. CONVEYANCE SYSTEM ANALYSIS AND DESIGN Not applicable. There are no changes proposed to the existing conveyance systems as discussed in Section 2, Core Requirement 4. SECTION A• SPECIAL REPORTS AND STUDIES Not applicable. The following permits apply to this project: • Shoreline Substantial Development Permit • Building Permit • Tree Permit SECTION 8: CONSTRUCTION STORMWATER POLLUTION PREVENTION PLAN ANAI PSIS AND DESIGN TESC REQUIREMENTS A TESC Plan has been prepared for the project and is included in this report as Figure 8-1. The plan will meet the minimum TESC requirements as discussed below. TESC Requirement 1: Clearing Limits Tree clearing and protection are identified on the landscape drawings. There is no planned pavement removal. TESC Requirement 2: Cover Measures Cover measures will be addressed in the TESC Plan Notes. TESC Requirement 3: Perimeter Protection A compost filter sock has been indicated at the grading/demolition limits. Stormwater Technical Information Report B-52 Memorial Park Phase 2, Tukwila, Washington 5 MAGNUSSON KLEMENCIC _ ASSOCIATES ■ TESC Requirement 4: Traffic Area Stabilization Stabilization will be provided by the existing pavement. The TESC Plan Notes will indicate that State water quality standards are applicable to construction site runoff. TESC Requirement 5: Sediment Retention Sediment retention in the form of catch basin inserts has been indicated. TESC Requirement 6: Surface Water Collection Compost filter socks have been shown on the plans. TESC Requirement 7: Dewatering Control Not applicable. No dewatering utilities are anticipated for this project. TESC Requirement 8: Dust Control Air quality will be addressed in the TESC Plan Notes. TESC Requirement 9: Flow Control Additional flow control not required. The proposed development reduces the total impervious surface and will decrease runoff peaks during construction. TESC Requirement 10: Control Pollutants Pollutant controls will be addressed in the TESC Plan Notes. TESC Requirement 11: Protect Existing and Proposed Flow Control BMPs Not applicable. The project limits of work do not include existing or proposed flow control devices. TESC Requirement 12: Maintain BMPs Project specifications and TESC notes require ongoing maintenance of BMPs. TESC Requirement 13: Manage the Project Project specifications require streamlined management of project BMPs STORMWATER POLLUTION PREVENTION AND SPILL PLAN DURING CONSTRUCTION Best management practices (BMPs) to prevent pollution from construction activities, in addition to the TESC requirements, shall be implemented during construction. These BMPs are based on the activity sheets in the 2016 King County Stormwater Pollution Prevention Manual for commercial, industrial, agricultural, public, and multifamily residential activities. Stormwater Technical Information Report B-52 Memorial Park Phase 2, Tukwila, Washington 6 MAGNUSSON KLEMENCIC ASSOCIATES Activity Sheet A-4 — Storage of Soil, Sand, and Other Erodible Materials • Cover and contain the stockpiles of raw materials to prevent stormwater from washing material to surface waters or a storm drainage system. The covers must be in place at all times when the stockpile is not in active use. Do not hose down the contained stockpile area to the storm drainage system. • Stockpiles located away from paved areas or where material will not be washed or tracked to the storm drainage system may not need to be covered unless windy conditions cause airborne particulate that could settle on hard surfaces and subsequently be washed into adjacent surface waters or storm drainage systems. • If the stockpiles are so large that they cannot feasibly be covered and contained, implement erosion control practices at the perimeter and as needed on site to prevent erosion and runoff of the stockpiled material into the storm drainage system or off site. See the King County Surface Water Design Manual, Appendix D (Erosion and Sediment Control Standards). • Required routine maintenance: — Sweep paved storage areas as needed and collect and dispose of loose solid materials. Do not hose down the area to a storm drain or ditch. — Stock cleanup materials, such as brooms, dustpans, and vacuum sweepers near the storage area. Activity Sheet A-11 – Cleaning or Washing of Tools and Equipment • Tool and equipment wash water is considered process water, and must discharge to the sanitary sewer, a holding tank, or a process treatment system, regardless of the washing method used. • You are encouraged to recycle your wash water with an enclosed loop system or use self-contained parts washers. Numerous products are commercially available that recycle and contain wash water and cleaning solvents. • If you cannot connect discharges to a sanitary sewer, process treatment system, or holding tank, you must contact the Washington State Department of Ecology and go through the Individual Wastewater Discharge permit process. • Lawnmowers may be rinsed with water only on a lawn or similar area as long as the rinsed -off gross clippings will not be washed to the storm drain system or surface waters when it rains. Wash water from oily or similarly contaminated lawn maintenance equipment is not allowed to flow to or discharge to any stormwater system or surface water. Activity Sheet A-20 – Concrete and Asphalt Application • Sweep parking lots, storage areas, and driveways as needed to collect dirt, waste, and debris. Do not hose down the area to the storm drainage system. Stormwater Technical Information Report B-52 Memorial Park Phase 2, Tukwila, Washington 7 MAGNUSSON KLEMENCIC ASSOCIATES • Cover and contain all nearby storm drains at the beginning of the workday. Drain covers and other containment devices are commercially available to keep runoff out of the storm drainage system. All solids collected must be disposed of properly at the end of the workday (or more frequently) prior to removing the containment or cover device(s). • Contain and collect the slurry from exposed aggregate washing. Never allow the slurry to get into a storm drain, ditch, roadway shoulder or gutter. Use a storm drain cover, inlet protection, or other containment device, such as a hand—dug, lined sump, to direct and contain slurry. All collected runoff must be disposed of properly. • Do not discharge concrete, slurry, or rinse water into gutters, storm drains, or drainage ditches or onto the paved surface of a roadway or driveway. • Designate an area on site where hand tools will be cleaned and the water collected for disposal. Commercial products and services are also available for concrete, slurry, and rinse water containment and disposal. • Sweep the pouring area at the end of the job or more frequently if needed. Collect loose aggregate chunks and dust. Do not hose down the area to a storm drain. Activity Sheet A-31 — Vehicle and Equipment Parking and Storage • Sweep parking lots, storage areas, and driveways as needed to collect dirt, waste, and debris. Do not hose down the area to the storm drainage system. • If washing/pressure washing of the parking lot occurs, the wash water must be collected and discharged to a sanitary sewer or other treatment system. There are services that will clean parking Tots and collect water for off-site disposal. Never drain wash water to the storm drainage system. • Gravel and dirt lots may require additional BMPs to prevent sediment -laden water from leaving the site. Vehicles can track dirt out of parking and storage areas onto public roadways. Basic sediment controls as outlined in Appendix D ("Erosion and Sediment Control Standard?) of the King County Surface Water Design Manual must be installed if other BMPs do not adequately control sediment laden water from entering off site storm water conveyance systems or surface water. Wheel wash facilities may need to be considered if track -out of mud becomes a problem. See Activity Sheet A- 41, "Wheel Wash and Tire Bath Operations." Activity Sheet A-42 — Potable Water Line Flushing or Tank Maintenance When flushing water lines, filter water through sediment traps. If super -chlorination or chemical treatment is used as part of flushing, the water must be discharged to the sanitary sewer (with applicable permits) or, if a sanitary sewer is not available, the water must be collected and disposed of appropriately. Water cannot be discharged directly to stormwater systems unless it is treated and water quality standards are met. Discharging treated water to stormwater systems requires approval from the Washington State Department of Ecology. Stormwater Technics( Information Report 8 B-52 Memorial Park Phase 2, Tukwila, Washington MAGNUSSON KLEMENCIC ASSOCIATES Activity Sheet A-44 — Dust Control and Soil Erosion and Sediment Control for Manufacturing and Other Commercial Operations • Sweep paved areas as needed where dust accumulates from commercial, manufacturing, and industrial operations. Use power vacuum cleaners and sweepers as appropriate to minimize generating airborne dust and for more efficient dust removal. • Regularly clean equipment and vehicles subject to dust accumulation from operations. Never wash down equipment or vehicles to the storm drainage system. • Stabilize or cover areas of exposed or disturbed soil where necessary to prevent soil erosion. See the King County Surface Water Design Manual, Appendix D, Erosion and Sediment Control Standards, for recommended erosion and sediment control practices and standards. • Ensure employees are trained in the proper operating procedures to minimize dust accumulation on the ground. SECTION 9: BOND QUANTITIES WORKSHEET, RETENTION/DETENTION FACILITY SUMMARY SHEET AND DEM ARATION OF COVENANT Not applicable. This item is specific to work in unincorporated King County. SECTIC)N 1O• OPERATIONS AND MAINTENANCE MANUAL Not applicable. There are no new flow control or water quality facilities proposed for this project. Stormwater Technical Information Report 9 B-52 Memorial Pork Phase 2, Tukwila, Washington FIGURES 1 MAGNUSSON KLEMENCIC ASSOCIATES MAGNUSSON KLEMENCIC FIGURES Sea le a WT sfiTT Mown afFfi t Ms wim.Y7Wrrs wniclr, PROJECT LOCATION Medina iselkaLe igwre Bellevue Mercer stand Bryn Mawr Skyway T Renton .7.531 —Osr Nk • y Cod Gerk AnA Newvbetl, FIGURE 1-1: VICINITY MAP Stormwater Technical Information Report B-52 Memorial Park Phase 2, Tukwila, Washington 1 10 10 0 10 E!!!!Lia!El sclle 1' 4C' 014 ExbriNc, wATE,R CUALITY IREATMENT IS I C WEL R: 'LSE 2 117 3ISTLREANCE AREA, "•,'P MAGNUSSON KLEMENCIC 1 I' . A' RAISBECK AVIATION HIGH SCHOOL 9151`,G S'ORM DRAIN, TY" DOANSTO, ADAM* WAVES R164 Aq tYIS"M; KING ra.X;P:"Y OLITFA.1 TO SIP 5 11-,6.7it 2 L1A15 OF SITE CISTJR3ANCE, - ---"1; • - PROPERTY UNE, TYP FIGURE 1-2: SITE DRAINAGE AREA, CHARACTER'S' ICS, \ AND EXISTING STORM DRAIN SYSTEM (PRIOR TO PHASE 1) \ Stormwater Technical Information Report B-52 Memorial Park Phase 2, Tukwila, Washington Y ID 20 0 10 sc:de 1" = 4C' feet Rt -t S 'jRLvNC. R+tA _11 Y; ACES MAGNUSSON KLEMENCIC AS �L A`H RAiBEOl( AVIATION HIGH SCHOOL • PHASE 2 SITE t 1111 DISTURBANCE PROPERTY LINE, TYP LIMITS, Tile —ter FIGIJRE2 : SITE DISTURBANCE AREA Stormwater Technical Information Report B-52 Memorial Park Phase 2, Tukwila, Washington 40 20 0 40 I. scale 1" = 40' Beet P: LASE 2 UNITS OF SITE I)GI'„ Y.BANCh, IYF r-"\ L___ '0" EXISRNG PERVIOUS AREA PRIOR TO PHASE 1 -0-06 ACRES EXISTING IMPERVIOIUS AREA PRIOR t0 FHASE I - 0.90 AC=r5 MAGNUSSON KLEMENCIC a5?G•. RAISBECK AVIATION HIGH SCHOOI. 1 • • • •• • •• • • • t • PROPERTY UNE, TVP FIGURE 2-2: EXISTING PERVIOUS AND IMPERVIOUS AREAS Stormwater Technical Information Report B-52 Memorial Park Phase 2, Tukwila, Washington 40 20 0 40 scale 10 = 40' `eet L_ MAGNUSSON KLEMENCIC RAISBECK AVIATION HIGH SCHOOL PHASE 2 IMPERVIOUS AREA - 0.20 ACRES , T IP 0 PHASE 2 UMITS OF SITE DISTURBANCE, TYP • PHASE 2 PERVIOUS AREA - 0.76 ACRES, TYP PROPERTY UNE, TYP \ FIGURE 2-3: PROPOSED PERVIOUS AND IMPERVIOUS AREAS \ Stormwater Technical Information Report B-52 Memorial Park Phase 2, Tukwila, Washington APPENDIX ■ MAGNUSSON KLEMENCIC ASSOCIATES KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Part 1 PROJECT OWNER AND PROJECT ENGINEER Project Owner Museum of Flight Foundation Phone 206.764.5700 Address 9404 E Marginal Way S, 98108 Project Engineer Rita Greene Company Magnusson Klemencic Associates Phone 206.215.8237 Part 3 TYPE OF PERMIT APPLICATION ❑ Landuse (e.g.,Subdivision / Short Subd. / UPD) 21 Building (e.g.,M/F / Commercial / SFR) ❑ Clearing and Grading r❑ Right -of -Way Use CJ Other Public Works Part 2 PROJECT LOCATION AND DESCRIPTION Project Name Museum of Flight B-52 Memorial Park Ph2 DPER Permit # N/A Location Township 24N Range 4E Section 33 Site Address 9725 E Marginal Way S, 98108 Part 4 OTHER REVIEWS AND PERMITS ❑ DFW HPA ❑ COE 404 ❑ DOE Dam Safety ❑ FEMA Floodplain U COE Wetlands a( Other Tree Permit a( Shoreline Management ❑ Structural Rockery/Vault/ ❑ ESA Section 7 Part 5 PLAN AND REPORT INFORMATION Technical Information N/A Not King County Project Type of Drainage Review (check one): Date (include revision dates): Date of Final: Report ❑ Full CITargeted ❑ Simplified CI Project CI Directed Site Improvement N/A Not King County Project Plan Type (check one): Date (include revision dates): Date of Final: Pian (Engr. Plans) ❑ Full ❑ Modified ❑ Simplified Approved Adjustment No. Date of Approval: Part 6 SWDM ADJUSTMENT APPROVALS Type (circle one): Standard / Experimental / Description: (include conditions in TIR Section 2) N/A Blanket Approved Adjustment No. Date of Approval: 2016 Surface Water Design Manual 1 4/24/2016 KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Part 7 MONITORING REQUIREMENTS Monitoring Required: Start Date: Describe: Yes NO Completion Date: Re: KCSWDM Adjustment No. Part 8 SITE COMMUNITY AND DRAINAGE BASIN Community Plan : N/A Special District Overlays: Drainage Basin: Stormwater Requirements: Part 9 ONSITE AND ADJACENT SENSITIVE AREAS N/A ❑ River/Stream ❑ Lake ❑ Wetlands ❑ Closed Depression ❑ Floodplain ❑ Other ❑ Steep Slope ❑ Erosion Hazard ❑ Landslide Hazard ❑ Coal Mine Hazard ❑ Seismic Hazard ❑ Habitat Protection Part 10 SOILS Soil Type SCS Soil Group D Slopes ❑ High Groundwater Table (within 5 feet) ❑ Other Erosion Potential ❑ Sole Source Aquifer ❑ Seeps/Springs ❑ Additional Sheets Attached 2016 Surface Water Design Manual 2 4/24/2016 KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Part 11 DRAINAGE DESIGN LIMITATIONS REFERENCE ❑ Core 2 — Offsite Analysis ❑ Sensitive/Critical Areas ❑ SEPA N/A ❑ LID Infeasibility ❑ Other LIMITATION / SITE CONSTRAINT ❑ Additional Sheets Attached Part 12 TIR SUMMARY SHEET (provide one TIR Summary Sheet per Threshold Discharge Area) Threshold Discharge Area: B-52 Project Redevelopment Site (name or description) Core Requirements (all 8 apply): Discharge at Natural Location Number of Natural Discharge Locations: 1 Offsite Analysis N/A, see report Level: 1 / 2 / 3 dated: Flow Control (include facility Level: 1 / 2 / 3 or Exemption Number summary sheet) N/A, see report Flow Control BMPs Basic Dispersion where feasible Conveyance System Spill containment located at: N/A, see report Erosion and Sediment Control / CSWPP/CESCL/ESC Site Supervisor: N/A Not King County Project Construction Stormwater Contact Phone: Pollution Prevention After Hours Phone: Maintenance and Operation Responsibility (circle one):IC:Jiat-e-D5 Public If Private, Maintenance Log Required: Yes /©o Financial Guarantees and Provided: Yes / No N/A Not King Liability County Project Water Quality (include facility Type (circle one): Basic / Sens. Lake / Enhanced Basic / Bog summary sheet) or Exemption No. N/A, see report Landscape Management Plan: Yes / No Special Requirements (as applicable): Area Specific Drainage Type: CDA / SDO / MDP / BP / LMP / Shared Fac. / one Requirements Name: Floodplain/Floodway Delineation Type (circle one): Major / Minor / Exemption / on - 100 -year Base Flood Elevation (or range): Datum: Flood Protection Facilities Describe: N/A, see report 2016 Surface Water Design Manual 3 4/24/2016 KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Part 12 TIR SUMMARY SHEET (provide one TIR Summary Sheet per Threshold Discharge Area) Source Control (commercial / industrial land use) Describe land use: Commercial, no Pollution Generating Surfaces Describe any structural controls: None Oil Control High -use Site: Yes /0 Treatment BMP: Maintenance Agreement: Yes / ©o with whom? Other Drainage Structures Describe: al/Cover Measures Part 13 EROSION AND SEDIMENT CONTROL REQUIREMENTS MINIMUM ESC REQUIREMENTS Type/Description MINIMUM ESC REQUIREMENTS DURING CONSTRUCTION Type/Description AFTER CONSTRUCTION Clearing Limits Rt Stabilize exposed surfaces al/Cover Measures gRemove and restore Temporary ESC Facilities L' Perimeter Protection al Clean and remove all silt and debris, ensure ❑ Traffic Area Stabilization operation of Permanent Facilities, restore operation of Flow Control BMP Facilities as ar Sediment Retention necessary ❑ Surface Water Collection ❑ Flag limits of SAO and open space preservation El Dewatering Control areas ar Dust Control ❑ Other ❑ Flow Control ❑ Protection of Flow Control BMP Facilities (existing and proposed) ❑ Maintain BMPs / Manage Project Part 14 STORMWATER FACILITY DESCRIPTIONS (Note: Include Facility Summary and Sketch) Flow Control Type/Description Water Quality Type/Description ❑ Detention ❑ Infiltration L3Regional Facility ❑ Shared Facility ❑ Flow Control BMPs ❑ Other ❑ Vegetated Flowpath ❑ Wetpool CI Filtration ❑ Oil Control ❑ Spill Control ❑ Flow Control BMPs ❑ Other N/A, see report 2016 Surface Water Design Manual 4 4/24/2016 KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Part 15 EASEMENTS/TRACTS Part 16 STRUCTURAL ANALYSIS ❑ Drainage Easement ❑ Covenant ❑ Native Growth Protection Covenant ❑ Tract ❑ Other N/A, see report ❑ Cast in Place Vault ❑ Retaining Wall ❑ Rockery > 4' High ❑ Structural on Steep Slope ❑ Other N/A, see report Part 17 SIGNATURE OF PROFESSIONAL ENGINEER I, or a civil engineer under my supervision, have visited the site. Actual site conditions as observed were inco porated into this worksheet and the attached Technical Information Report. To the best of my kn.;; dg : the 'nfor ation provided here is accurate. / 1 0/22/1 8 Signed/Date 2016 Surface Water Design Manual 4/24/2016 5 oo REVIEWED FOR ODE COMPLIANCE APPROVED -' DEC 12 2018 City of Tu ' rt''," p LTR v 4.0 RISION.NO1I iAna RESION N0.? 0, RECEIVED v OCT 2 4 2018 o. TUKWILA PUBLIC WORKS O w flECEIVED N CITY OF TUKWILA O OCT 23 2018 'Z.RMIT CENTER TABLE OF CONTENTS SECTION 00 01 01 - 1 SPECIFICATIONS B-52 MEMORIAL PARK, PHASE 2 THE MUSEUM OF FLIGHT 9404 E MARGINAL WAY S SEATTLE, WA 98108 DIVISION 1 Section DIVISION 2 Section GENERAL REQUIREMENTS 01 57 13 Temporary Erosion and Sediment Control SITE CONSTRUCTION 02 41 00 Selective Site Demolition DIVISION 3 CONCRETE Section 03 20 00 DIVISION 31 EARTHWORK Section 31 00 00 Section 31 11 00 Section 31 56 39 DIVISION 32 Concrete Reinforcing Earthwork Clearing and Grubbing Tree Protection EXTERIOR IMPROVEMENTS Section 32 11 23 Section 32 12 10 Section 32 12 16 Section 321320 Section 32 17 23 Section 32 84 00 Section 32 91 00 Section 32 92 00 Section 32 92 19 Section 32 93 00 Aggregate Base Course Tack Coats Asphalt Paving Site Concrete Finishes Pavement Markings Irrigation Planting Soils Turfs and Grasses Seeding Plants END TABLE OF CONTENTS 217021 B-52 MEMORIAL PARK PH 2 MUSEUM OF FLIGHT PERMIT SUBMITTAL 10/23/18 TEMPORARY EROSION AND SECTION 01 57 13 - 1 SEDIMENT CONTROL PART1 GENERAL 1.1 SUMMARY A. Section Includes: Requirements for work and materials to minimize erosion from disturbed areas and construct facilities for treating storm water runoff during construction. 1.2 RELATED SECTIONS A. Section 31 00 00, "Earthwork" 1.3 REFERENCES A. The latest versions (unless noted otherwise) of the publications listed below form a part of this specification to the extent referenced. The publications are referred to in the text by the basic designation only. B. American Society for Testing and Materials (ASTM): 1. ASTM D 4397: Polyethylene Sheeting for Construction, Industrial and Agricultural Applications C. Environmental Protection Agency (EPA): 1. TM -180: Test Method for Turbidity D. King County (KC): 1. SWDM: (2016) Surface Water Design Manual 2. SPPM: (2016) Stormwater Pollution Prevention Manual E. Washington State Department of Transportation (WSDOT): 1. SS -1: (2018) Standard Specifications for Road, Bridge, and Municipal Construction PART2 PRODUCTS 2.1 POLYETHYLENE SHEETING A. ASTM D 4397, translucent, 6 mil thickness. 2.2 STRAW MULCH A. SS -1, Section 9-14.4(1). All straw mulch material shall be in an air dried condition free of noxious weeds and other materials detrimental to plant life. Straw shall be seasoned before bailing or loading. Straw mulch so provided shall be suitable for spreading with mulch blower equipment. Hay is not acceptable. 2.3 CATCH BASIN INSERTS A. SS -1, Section 8-01.3(9), "Inlet Protection, Below Grate Inlet." 217021 B-52 MEMORIAL PARK PH 2 102318 THE MUSEUM OF FLIGHT BUILDING AND PUBLIC WORKS PERMIT TEMPORARY EROSION AND SECTION 01 57 13 - 2 SEDIMENT CONTROL 2.4 COMPOST FILTER SOCK A. SS -1, Section 9-14.5(6), "Compost Sock." Compost shall be in conformance with SS -1, Section 9-14.4(8), "Compost." PART 3 EXECUTION 3.1 GENERAL A. During construction the runoff of storm water flows shall be controlled and treated to minimize water quality impacts. The methods of clearing, dewatering, excavation and stockpiling materials shall provide for preventive measure to control silting and erosion, and to intercept and settle any runoff of turbid waters. Any downstream damage due to the failure by the contractor to fulfill these requirements will become the contractor's liability. Temporary erosion and sedimentation control are the Contractor's responsibility throughout the duration of the contract. The means and methods shown on the drawings and included in the specifications represent only minimum contract requirements and are not intended to represent a complete and comprehensive plan. It is the responsibility of the Contractor to maintain all erosion and sedimentation control systems to meet all requirements of this contract and all requirements of permitting and regulatory agencies. a. Any additions, improvements or changes to erosion control systems shall be designed in accordance with relevant regulations, the SWDM, and design standards, and shall be submitted for the Architect's approval. B. The Contractor shall implement Best Management Practices outlined in the SPPM to mitigate surface water pollution from construction activities. 3.2 INSTALLATION OF CATCH BASIN INSERTS A. Install at locations shown on the drawings and in accordance with manufacturer's recommendations. B. Install prior to commencement of any work. 3.3 INSTALLATION OF COMPOST FILTER SOCK A. Install at locations shown on the drawings and in accordance with manufacturer's recommendations. B. Install prior to commencement of any work. 3.4 PROTECTION OF EXPOSED SURFACES A. Protect newly graded areas from traffic, erosion, and settlements that may occur after clearing, installation of silt fences, stockpiling, or excavation until hydroseeding and planting for permanent erosion control can be installed or until indicated on the contract schedule. Repair or reestablish damaged grades, elevations, or slopes. All exposed earth surfaces with a slope of 2:1 or steeper shall be protected from inclement weather by hydroseeding or with polyethylene sheeting staked to the ground as indicated. Individual polyethylene sheeting shall be overlapped a minimum of 1'-6" at the adjacent sheets. Exposed earth surfaces, with slopes flatter than 2:1 shall be protected from erosion with straw mulch spread over areas where concentrated surface water runoff is anticipated. 217021 B-52 MEMORIAL PARK PH 2 102318 THE MUSEUM OF FLIGHT BUILDING AND PUBLIC WORKS PERMIT TEMPORARY EROSION AND SECTION 01 57 13 - 3 SEDIMENT CONTROL B. At all times, any disturbed areas left unworked for more than 30 days shall be seeded. May 1 through September 30, temporary cover measures shall be installed on all areas left undisturbed for more than seven days. October 1 through April 30, minimum wet season requirements apply: 1. Install temporary cover measures on all areas that will remain unworked for more than two days and on stockpiles and steep cut and fill slopes. 2. Retain onsite a quantity of cover measures materials sufficient to cover all disturbed areas. 3. By October 8, temporarily seed and mulch all areas that will be unworked during the wet season. 4. Mulch all seeded areas. 5. Stabilize all construction traffic areas, unless already graveled. 3.5 MAINTENANCE OF EROSION AND SEDIMENTATION CONTROL SYSTEMS A. The Contractor shall maintain, repair and replace all erosion and sediment control devices such that the system is in good working condition for the duration of the contract. B. All erosion control facilities shall be inspected each day and repaired as necessary to conform to detail requirements, or upon notification of deficiency. Repairs shall be made within 24 hours of notification. Additional facilities required by Contractor operations or scheduling of work shall be constructed by the Contractor at no additional cost. When sediment deposits reach a height of 6 inches on the sedimentation barrier, the barrier shall be cleaned or replaced. Replace inlet inserts based on manufacturer's recommendations. END OF SECTION 217021 B-52 MEMORIAL PARK PH 2 102318 THE MUSEUM OF FLIGHT BUILDING AND PUBLIC WORKS PERMIT SELECTIVE SITE DEMOLITION SECTION 02 41 00 - 1 PART1 GENERAL 1.1 SUMMARY A. Section Includes: Requirements for demolition and/or removal work as a part of new construction. 1.2 REFERENCES A. The latest versions (unless noted otherwise) of the publications listed below form a part of this specification to the extent referenced. The publications are referred to in the text by the basic designation only. B. Code of Federal Regulations (CFR): 1. 29 CFR 1910: Occupational Safety and Health Standards 2. 29 CFR 1926: Occupational Safety and Health Regulations for Construction 1.3 GENERAL REQUIREMENTS A. Do not begin demolition until authorization is received from the Owner. Remove rubbish and debris from the project site daily; do not allow accumulations inside or outside the building. Store materials that cannot be removed daily in areas specified by the Owner. 1.4 SUBMITTALS A. Submit the following in accordance with Section 01 33 00, "Submittal Procedures." 1. Submit the proposed Demolition Plan, which delineates demolition and removal procedures. 2. Demolition plan shall include procedures and coordination with other work in progress, a disconnection schedule of utility services, and a detailed description of methods and equipment to be used for each operation and of the sequence of operations. 1.5 REGULATORY AND SAFETY REQUIREMENTS A. Comply with federal, state, and local hauling and disposal regulations. B. Perform all excavation work in accordance with all applicable requirements of governing authorities and applicable rules and regulations of 29 CFR 1926 and 29 CFR 1929. 1.6 DUST AND DEBRIS CONTROL A. Prevent the spread of dust and debris to occupied portions of the building, on pavements, and avoid the creation of a nuisance or hazard in the surrounding area. Do not use water if it results in hazardous or objectionable conditions such as, but not limited to, ice, flooding, or pollution. Vacuum and dust the work area daily. Sweep pavements as often as necessary to control the spread of debris. 217021 B-52 MEMORIAL PARK PH 2 102318 THE MUSEUM OF FLIGHT BUILDING AND PUBLIC WORKS PERMIT SELECTIVE SITE DEMOLITION SECTION 02 41 00 - 2 1.7 PROTECTION A. Traffic Control Signs: Where pedestrian, and driver, safety is endangered in the area of removal work, use traffic barricades with flashing lights. Anchor barricades in a manner to prevent displacement. Notify the Owner prior to beginning such work. B. Existing Work: Protect existing work which is to remain in place, be reused, or remain the property of the Owner. Repair items, which are to remain and which are damaged during performance of the work to their original condition, or replace with new. Do not overload structural elements or pavements to remain. Provide new supports and reinforcement for existing construction weakened by demolition or removal work. Repairs, reinforcement, or structural replacement must have Owner approval. C. Facilities: Protect utility services. Where removal of existing utilities and pavement is specified or indicated, provide approved barricades, temporary covering of exposed areas, and temporary services or connections to utilities. 1.8 RELOCATIONS A. Perform the removal and reinstallation of relocated items as indicated with workmen skilled in the trades involved. Repair items to be relocated, which are damaged or replace damaged items with new undamaged items as approved by the Owner. PART2 PRODUCTS NOT USED PART 3 EXECUTION 3.1 EXISTING FACILITIES TO BE REMOVED A. Structures: Remove indicated existing structures and foundations. B. Utilities and Related Equipment: Remove existing utilities as indicated and terminate in a manner conforming to the nationally recognized code covering the specific utility and approved by the Owner. If utility lines are encountered that are not shown on drawings, contact the Owner for further instructions. C. Paving and Slabs: Provide neat sawcuts at limits of pavement removal as indicated. Remove sawcut concrete and asphaltic concrete paving and slabs as indicated. 3.2 FILLING A. Fill holes, open basements, and other hazardous openings in accordance with Section 31 00 00, "Earthwork." 3.3 DISPOSITION OF MATERIALS A. Title to Materials: Except where specified in other sections, all materials and equipment removed, and not reused, shall become the property of the Contractor and shall be legally removed from property. Title to materials resulting from demolition, and materials and equipment to be removed, is vested in the Contractor upon approval by the Owner of the Contractor's demolition and removal procedures, and authorization by the Owner to begin 217021 B-52 MEMORIAL PARK PH 2 102318 THE MUSEUM OF FLIGHT BUILDING AND PUBLIC WORKS PERMIT SELECTIVE SITE DEMOLITION SECTION 02 41 00 - 3 demolition. The Owner will not be responsible for the condition or loss of, or damage to, such property after contract award. Materials and equipment shall not be viewed by prospective purchasers or sold on the site. 3.4 CLEANUP A. Debris and Rubbish: Remove and transport debris and rubbish in a manner that will prevent spillage on pavements, streets or adjacent areas. Clean up spillage from pavements, streets and adjacent areas. END OF SECTION 217021 B-52 MEMORIAL PARK PH 2 THE MUSEUM OF FLIGHT BUILDING AND PUBLIC WORKS PERMIT 102318 CONCRETE REINFORCING SECTION 032000 - 1 PART 1 - GENERAL 1.1 RELATED DOCUMENTS A. The drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 1 Specification Sections, apply to this Section. 1.2 SUMMARY A. This section covers materials, fabrication, placement, and tolerances of reinforcement and reinforcement accessories. B. Related Sections: 1. None. 1.3 REFERENCE STANDARDS A. The latest versions of the publications listed below form a part of this specification; comply with provisions of these publications except as otherwise shown or specified. 1. ACI 117 Standard Specification for Tolerances for Concrete 2. ACI 301 Standard Specifications for Structural Concrete, including other standards referred to in ACI 301, such as ASTM, AWS, etc. 3. CRSI MSP Manual of Standard Practice 4. International Code Council, Evaluation Services (ICC -ES): Evaluation Reports 1.4 SUBMITTALS A. General: Submit the following data and drawings for review and acceptance before fabrication and execution. B. Placing Drawings: Submit placing drawings showing fabrication dimensions and locations for placement of reinforcement and reinforcement supports. Indicate splicing, laps, details of reinforcing, and accessories. 1. Show embedded plates, bolts, etc., for purposes of checking for potential interferences. 2. Indicate locations of construction joints in the concrete construction. C. Mechanical Splices: Submit the types of mechanical splices proposed for use. Include the latest ICC -ES (or IAPMO-ES equivalent) Reports for threaded or sleeve -type splices to verify compliance with specified requirements. D. Headed Bars or Terminators: Submit the types of headed bars or terminators proposed for use. Include the latest ICC -ES (or IAPMO-ES equivalent) reports to verity compliance with the specified requirements. 217021 B-52 MEMORIAL PARK PH 2 032618 THE MUSEUM OF FLIGHT PERMIT SUBMITTAL CONCRETE REINFORCING SECTION 032000 - 2 E. Product Data: Include specifications and installation instructions for all proprietary materials and reinforcement accessories. F. Welding Procedures and Qualifications: Submit description of reinforcement weld locations, welding procedures, and welder qualifications when welding is permitted. G. Mill Certificates: Submit mill certificates for all] reinforcing steel for information and record only. 1.5 QUALITY ASSURANCE A. Allowable Tolerances: Fabrication and placement tolerances shall be in accordance with ACI 117. B. Welder Qualifications: Welders shall be qualified in the last six months in accordance with the American Welding Society, AWS D1.4, and the Washington Association of Building Officials (WABO). Welding procedures qualified by others and welders qualified by another employer may be acceptable as permitted by AWS D1.4. If re -qualification is required, the cost of these qualification tests shall be borne by the Contractor. 1.6 DELIVERY, STORAGE, AND HANDLING A. Bundles of reinforcing bars shall be tagged showing quantity, grade, size, and suitable identification to allow checking, sorting, and pllacing. Identification of steel shall be maintained after bundles are broken. 1. Bundles of flat sheets and rolls of welded wire reinforcement shall be tagged showing quantity, style designation, width, and length. B. Reinforcing steel shall be stored off the ground in a manner that will prevent bending and be protected from earth, oil, or any other material that might impair bond to concrete. PART 2 - PRODUCTS 2.1 MATERIALS A. Reinforcing Bars: ASTM A615, Grade 60, deformed, unless otherwise indicated on drawings. B. Reinforcing Bars for Welding and Reinforcing Bars Specified as "Special Ductile Quality": ASTM A706, Grade 60, deformed. ASTM A615, Grade 60 reinforcement may be used in lieu of ASTM 706 if the following conditions apply: 1. The actual yield strength based on mill tests does not exceed the specified yield strength by more than 18,000 psi. 2. The ratio of the actual ultimate tensile strength to the actual tensile yield strength is not less than 1.25. C. Column Spirals (where noted): Plain, cold -drawn wire conforming to ASTM A82 or hot -rolled rods for spirals conforming to ASTM A615. 217021 B-52 MEMORIAL PARK PH 2 032618 THE MUSEUM OF FLIGHT PERMIT SUBMITTAL CONCRETE REINFORCING SECTION 032000 - 3 D. Welded Wire Reinforcement: ASTM A185 or ASTM A497; mesh and wre sizes as noted on Structural drawings. When used in slabs, provide flat sheets, not rolls. E. Bar Supports: In accordance with CRSI Manual of Standard Practice; types and sizes as required for the conditions of the installation. 1. For exposed to view concrete surfaces where legs of supports are in contact with forms, provide supports with legs that are hot -dipped, galvanized, plastic protected, or stainless steel, in accordance with CRSI Class 1 or Class 2 (Types A or B). 2. Provide precast concrete blocks not less than 4 inches square when supporting reinforcing steel on ground. Precast concrete blocks shall have a compressive strength equal to that of surrounding concrete. F. Tie Wire: No. 16 -gage minimum, annealed black wire. G. Threaded Splices: See General Notes on Structural Drawings. H. Headed Bars or Terminators: See General Notes on Structural Drawings. I. Steel Stud Assemblies or Studrails: ASTM 1044; Size, length, and assembly configuration as noted on the Structural Drawings. 2.2 FABRICATION A. Reinforcement: Bend reinforcement cold. Fabricate and detail to shapes and dimensions shown on drawings in accordance with CRSI Manual of Standard Practice and with fabricating tolerances in accordance with ACI 117. B. Welding: Welding or tacking of reinforcing bars is not permitted unless specifically indicated in the Contract Documents. When welding of reinforcement is indicated and required, provide welds in accordance with AWS D1.4. PART 3 - EXECUTION 3.1 INSTALLATION A. General: When concrete is placed, reinforcement shall be free of materials deleterious to bond. Reinforcement with rust, mill scale, or a combination of both will be considered satisfactory provided the minimum nominal dimensions, nominal weight, and the minimum average height of deformation of a hand -wire -brushed test specimen are not less than the applicable ASTM specification requirements. B. Reinforcement: Place, support, and fasten reinforcement as indicated in the Contract Documents. Do not exceed the placing tolerances specified in ACI 117 before concrete is placed. When necessary to move reinforcement beyond the specified placing tolerances to avoid interference with other reinforcement or embedded items, submit the resulting arrangement of reinforcement for acceptance. C. Cover: Allowable concrete cover for reinforcement is indicated in the project drawings. Tolerances on concrete cover shall meet the requirements of ACI 117. 217021 B-52 MEMORIAL PARK PH 2 032618 THE MUSEUM OF FLIGHT PERMIT SUBMITTAL CONCRETE REINFORCING SECTION 032000 - 4 D. Tie Wires: After cutting tie wires, turn wires to the inside of section and bend so that concrete placement will not force ends to exposed concrete surfaces. E. Welded Wire Reinforcement: Place, support, and fasten welded wire reinforcement as indicated in the Contract Documents. Do not exceed the placing tolerances specified in ACI 117 before concrete is placed. 1. Slabs on Grade: Extend welded wire reinforcement to within 2 inches of the concrete edge. Lap edges and ends of reinforcement sheets a minimum of one mesh spacing plus 2 inches, not less than 6 inches. Support welded wire reinforcement during placing of concrete to ensure required position in the slab. Do not place welded wire reinforcement on grade and subsequently raise into position in concrete. 2. Slabs on Steel Deck: Extend welded wire reinforcement to within 2 inches of the concrete edge. Lap edges and ends of reinforcement sheets a minimum of one mesh spacing plus 2 inches, not Tess than 6 inches. Support welded wire reinforcement during placing of concrete to ensure required position in the slab. Do not place welded wire reinforcement on deck and subsequently raise into position in concrete. F. Splicing: Make splices as indicated in the project drawings. Lapped bars shall be placed in contact and securely tied, or spaced transversely apart to permit the embedment of the entire surface of each bar in concrete. Lapped bars shall not be spaced farther apart than 1/5 the required length of lap, and not to exceed 6 inches. 1. Mechanical Splices: Mechanical splices for reinforcement not shown on the project drawings shall be submitted for review and accepted prior to use. Mechanical splices shall be in accordance with the recommendations of the manufacturer of the mechanical splicing device. G. Reinforcement shall not be field bent or straightened except when specifically permitted. H. Reinforcement shall not be cut in the field except when specifically permitted. 3.2 DEIFECTIVE WORK A. General: The following reinforcing steel work will be considered defective and shall be removed and replaced by the Contractor at no additional cost to the Owner: 1. Bars with kinks or bends not shown on drawings. 2. Bars injured due to bending or straightening. 3. Bars heated for bending. 4. Reinforcement not placed in accordance with the drawings and/or specifications. END OF SECTION 217021 B-52 MEMORIAL PARK PH 2 032618 THE MUSEUM OF FLIGHT PERMIT SUBMITTAL EARTHWORK SECTION 31 00 00 - 1 PART1 GENERAL 1.1 SUMMARY A. Section includes: Requirements for excavation, filling, grading, preparation of subgrade, imported material, trenching, backfilling, compaction and testing. 1.2 RELATED SECTIONS A. Section 01 33 00, "Submittal Procedures" 1.3 REFERENCES A. The latest versions (unless noted otherwise) of publications listed below form a part of this specification to the extent referenced. The publications are referred to in the text by the basic designation only. B. American Concrete Institute (ACI): 1. ACI 229 Controlled Low -Strength Materials C. American Society For Testing And Materials (ASTM): 1. ASTM D 698 Laboratory Compaction Characteristics of Soil Using Standard Effort (12,400 ft-Ibf/ft (600 kN-m/m)) 2. ASTM D 1556 Density and Unit Weight of Soil in Place by the Sand -Cone Method 3. ASTM D 1557 Laboratory Compaction Characteristics of Soil Using Modified Effort (56,000 ft-Ibf/ft (2,700 kN-m/m)) 4. ASTM D 2487 Classification of Soils for Engineering Purposes (Unified Soil Classification System) 5. ASTM D 4253 Maximum Index Density of Soils Using a Vibratory Table 6. ASTM D 4254 Minimum Index Density and Unit Weight of Soils and Calculation of Relative Density 7. ASTM D 6938 (2008) Standard Test Method for In -Place Density and Water Content of Soil and Soil -Aggregate by Nuclear Methods (Shallow Depth) D. Code of Federal Regulations (CFR) 1. 29 CFR 1910 2. 29 CFR 1926 Occupational Safety and Health Standards Occupational Safety and Health Regulations for Construction Corps of Engineers (COE) 1. COE EM -385-1-1 Safety and Health Requirements Manual Washington State Department of Transportation (WSDOT): 1. SS -1 Standard Specifications for Road, Bridge, and Municipal Construction 217021 B-52 MEMORIAL PARK PH 2 102318 THE MUSEUM OF FLIGHT BUILDING AND PUBLIC WORKS PERMIT EARTHWORK SECTION 31 00 00 - 2 1.4 QUALITY ASSURANCE A. Perform all excavation work in accordance with all applicable requirements of governing authorities and applicable rules and regulations of 29 CFR 1926 and 29 CFR 1929. 1.5 DEFINITIONS A. Backfill: A specified material used in refilling a cut, trench, or other excavation, placed at a specified degree of compaction. B. Capillary Break: A layer of clean, poorly graded crushed rock, stone, or natural sand or gravel having a high porosity which is placed beneath a building slab with or without a vapor barrier to cut off the capillary flow of pore water to the area immediately below the slab. C. Cohesive Materials: Cohesive materials include materials classified by ASTM D 2487 as GC, SC, ML, CL, MH, and CH. Materials classified as GM and SM will be identified as cohesive only when the fines have a plasticity index greater than zero. D. Cohesionless Materials: Cohesionless materials include materials classified by ASTM D 2487 as GW, GP, SW, and SP. Materials classified as GM and SM will be identified as cohesionless only when the fines have a plasticity index of zero. E. Compaction: The process of mechanically stabilizing a material by increasing its density at a controlled moisture condition. "Degree of Compaction" is expressed as a percentage of the maximum density obtained by the test procedure described in ASTM D 698 or ASTM D 1557 for general soil types or ASTM D 4253 and ASTM D 4254 (Relative Density) for isolated cohesionless materials, abbreviated in this specification as "XX percent ASTM D 1557 maximum density." F. Structural Fill: A specified soil mix or gradation of materials constructed to attain maximum bearing strength and minimize consolidation or differential settlement under a load. G. Embankment: A "fill" having a top that is higher than adjoining ground. H. Excavation: The removal of soil, rock, or hard material to obtain a specified depth or elevation. I. Fill: Specified material placed at a specified degree of compaction to obtain an indicated grade or elevation. J. Hard Material: Weathered rock, dense consolidated deposits or conglomerate materials, (excluding manmade materials such as concrete) which are not included in the definition of "rock" but which usually require the use of heavy excavation equipment with ripper teeth or the use of jack hammers for removal. K. In Situ Soil: Existing in place soil. L. Lift: A layer (or course) of soil placed on top of a previously prepared or placed soil. M. Rock: Solid, homogeneous, interlocking crystalline material with firmly cemented, laminated, or foliated masses or conglomerate deposits, neither of which can be removed without systematic drilling and blasting, drilling and the use of expansion jacks or feather wedges, or the use of backhoe -mounted pneumatic hole punchers or rock breakers; also large boulders, buried masonry, or concrete other than pavement, exceeding 1 cubic yard in volume. Removal of "hard material" will not be considered rock excavation because of intermittent drilling and blasting that is performed merely to increase production. 217021 B-52 MEMORIAL PARK PH 2 102318 THE MUSEUM OF FLIGHT BUILDING AND PUBLIC WORKS PERMIT EARTHWORK SECTION 31 00 00 - 3 N. Soil: The surface material of the earth's crust resulting from the chemical and mechanical weathering of rock and organic material. O. Subgrade: The material in excavation (cuts) and fills (embankments) immediately below any subbase, base, pavement, or other improvement. Also, as a secondary definition, the level below which work above is referenced. P. Topsoil: In natural or undisturbed soil formations, the fine-grained, weathered material on the surface or directly below any loose or partially decomposed organic matter. Topsoil may be a dark -colored, fine, silty, or sandy material with a high content of well decomposed organic matter, often containing traces of the parent rock material. Q. Unsatisfactory Material: Existing, in situ soil or other material which can be identified as having insufficient strength characteristics or stability to carry intended loads in fill or embankment without excessive consolidation or loss of stability. Materials classified as PT, OH, or OL by ASTM D 2487 are unsatisfactory. Unsatisfactory materials also include man-made fills, refuse, frozen material, uncompacted backfills from previous construction, unsound rock or soil lenses, or other deleterious or objectionable material. R. Unsuitable Material: Existing, in-situ materials classified as ML or MH by ASTM D 2487. S. Working Platform: A layer of compacted crushed rock or natural stone that replaces the in situ soil to provide a stable, uniform bearing foundation for construction equipment to facilitate further site construction. 1.6 SUBMITTALS A. Submit the following in accordance with Section 01 33 00, "Submittal Procedures." 1. Grain size distribution test results from the supplier for all imported materials including but not limited to structural fill and pipe bedding. The supplier's test results shall be no more than 6 months old. 2. Mix design for controlled density fill. 1.7 REGULATORY REQUIREMENTS A. Materials and workmanship specified herein with reference to SS -1 State Standard shall be in accordance with the referenced articles, sections and paragraphs of the standard except that measurement and payment provisions do not apply. Where the term "Engineer" is used, it shall mean "Owner's Representative." Where the term "State" is used it shall mean "Owner." 1.8 DELIVERY AND STORAGE A. Deliver and store materials in a manner to prevent contamination or segregation. 1.9 SITE CONDITIONS A. Dewatering Plan: Base on site surface and subsurface conditions and available soils and hydrological data. B. Movement of construction machinery and equipment over pipes and utilities during construction shall be at the Contractor's risk. Contact the utility companies for location(s) of their utilities. Perform work adjacent to privately owned utilities in accordance with procedures outlined by the utility company. Excavation made with power -driven equipment is not permitted within 2 feet of known utility or subsurface construction. For work immediately adjacent to or 217021 B-52 MEMORIAL PARK PH 2 102318 THE MUSEUM OF FLIGHT BUILDING AND PUBLIC WORKS PERMIT EARTHWORK SECTION 31 00 00 - 4 for excavations exposing a utility or other buried obstruction, excavate by hand. Start hand excavation on each side of the indicated obstruction and continue until the obstruction is uncovered or until clearance for the new grade is assured. Support uncovered lines or other existing work as affected by the contract excavation until approval for backfill is granted by the Owner's Representative. PART2 PRODUCTS 2.1 SOIL MATERIALS A. All imported materials for drainage backfill, structural fill, pipe bedding, and capillary break shall be provided by a WSDOT approved source for the material specified. All imported material shall be clean and free of contamination. B. Provide materials free from debris, roots, wood, scrap materials, vegetable matter, refuse or frozen material. Maximum particle size permitted is 3 inches. C. Structural Fill: 1. Dry Weather: "Common Borrow" meeting the requirements of Section 9-03.14(3) of SS -1. Common borrow will be suitable for use as structural fill during dry weather conditions only. 2. Wet Weather: "Gravel Borrow: meeting the requirements of Section 9-03.14(1) of SS -1 except that no more than 5 percent shall pass the No. 200 sieve. D. Fill and Backfill: Provide fill as specified in this section or indicated on the drawings. Soft, spongy, highly plastic, or otherwise unstable material is prohibited. On-site materials may be suitable for use as fill. This material shall meet the requirements of the specified material and only be used during dry weather and only if specified densities can be achieved, and as approved by the Owner's Representative. Provide imported materials if on-site materials are not suitable. E. Working Platform: Material and thicknesses of working platform for support of construction equipment shall be at the discretion of the construction contractor. The gradation and placement of such material shall not create large void spaces upon which overlying work is indicated to be placed. F. Trench Backfill: Provide structural fill as specified in this section or indicated on the drawings. Soft, spongy, highly plastic, or otherwise unstable material is prohibited. On-site materials may be suitable for use as trench backfill. On-site material shall only be used if specified densities can be achieved, and as approved by the Owner's Representative. G. Pipe Bedding: "Gravel Backfill for Pipe Zone Bedding" meeting the requirements of Section 9-03.12(3) of SS -1. 2.2 CONTROLLED DENSITY FILL (CDF) A. Controlled density fill (CDF), also known as Controlled Low Strength Materials (CLSM) is a self compacting, cementitious, flowable material requiring no subsequent vibration or tamping to achieve consolidation. CDF shall be mixed in accordance with ACI 229 by a ready -mix concrete producer. CDF shall have a minimum 28 -day strength of 50 psi and a maximum 28 -day strength of 300 psi. The CDF consistency shall be flowable (approximate slump 3 to 10 inches). Controlled density fill (CDF) shall be placed where indicated or approved by the Owner's Representative prior to being used as fill or backfill material. 217021 B-52 MEMORIAL PARK PH 2 102318 THE MUSEUM OF FLIGHT BUILDING AND PUBLIC WORKS PERMIT EARTHWORK SECTION 31 00 00 - 5 2.3 BURIED WARNING AND IDENTIFICATION TAPE A. Polyethylene plastic warning tape manufactured specifically for warning and identification of buried utility lines. Provide tape on rolls, 3 -inch minimum width, color coded as specified below for the intended utility with warning and identification imprinted in bold black letters continuously over the entire tape length. Warning and identification to read, "CAUTION, BURIED (intended service) LINE BELOW" or similar wording. Color and printing shall be permanent, unaffected by moisture or soil. 1. Warning Tape Color Codes: a. Red: Electric b. Orange: Telephone and Other Communications c. Blue: Water Systems d. Green: Sewer Systems (Storm and Sanitary) 2. Acid and alkali -resistant polyethylene plastic tape conforming to the width, color, and printing requirements specified above. Minimum thickness of tape shall be 0.003 inch. Tape shall have a minimum strength of 1,500 psi lengthwise, and 1,250 psi crosswise, with a maximum 350 percent elongation. 2.4 BURIED DETECTION WIRE A. Detection wire shall be insulated single strand, solid copper with a minimum of 12 AWG. PART 3 EXECUTION 3.1 PROTECTION A. Shoring: Provide shoring where required. In addition to Section 25 A and B of COE EM -385- 1-1, and other requirements of this contract meet the following: 1. Prevent undermining of pavements, foundations and slabs. 2. Slope banks where space permits. 3. Where shoring and sheeting materials remain in place in completed work to prevent settlements or damage to adjacent structures or as directed, backfill the excavation to 3 feet below the finished grade and remove the remaining exposed portion of the shoring before completing the backfill. B. Drainage and Dewatering: Plan for and provide the structures, equipment, and construction for the collection and disposal of surface and subsurface water encountered in the course of construction. 1. Drainage: Dispose of surface water which may accumulate in open excavations, unfinished fills, or other low areas. Remove water by trenching where approved, pumping, or other methods to prevent softening of exposed surfaces. Surface dewatering plan shall include rerouting of any storm water runoff or natural drainage if necessary and shall comply with requirements specified in Section 01 57 13, "Temporary Erosion and Sediment Control." 2. Dewatering: a. Groundwater flowing toward or into excavations shall be controlled to prevent sloughing or excavation slopes and walls, boils, uplift and heave in the excavation and to eliminate interference with orderly progress of construction. French drains, sumps, ditches or trenches will not be permitted within 3 feet of the foundation of any structure, except with specific written approval, and after specific contractual 217021 B-52 MEMORIAL PARK PH 2 102318 THE MUSEUM OF FLIGHT BUILDING AND PUBLIC WORKS PERMflT EARTHWORK SECTION 31 00 00 - 6 provisions for restoration of the foundation area have been made. Control measures shall be taken by the time the excavation reaches the water level in order to maintain the integrity of the in situ material. While the excavation is open, he water level shall be maintained continuously, at least 1 foot below the working level. b. Operate the dewatering system until construction work below existing water levels is complete. Measure and record the performance of the dewatering system at the same time each day by use of observation wells and piezometers installed in conjunction with the dewatering system. Have a back-up pump and system available for immediate use. See Section 01 57 13, "Temporary Erosion and Sediment Control," for additional requirements. C. Protection and Restoration of Surfaces: Protect newly graded areas from traffic, erosion, and settlements. Repair and reestablish damaged or eroded slopes, elevations or grades and restore surface construction prior to acceptance. Protect existing streams, ditches and storm drain inlets from water -borne soil by means of straw bale dikes or filter fabric dams as indicated. Conduct work in accordance with requirements specified in Section 01 57 13, "Temporary Erosion and Sediment Control." D. Disposal of Excavated Material: Dispose of clean excavated material in such a manner that it will not obstruct the flow of runoff, streams, endanger a partly finished structure, impair the efficiency or appearance of facilities, or be detrimental to the completed work. 3.2 SURFACE PREPARATION A. Clearing and Grubbing: As specified in Section 31 11 00, "Clearing and Grubbing.". B. Stripping of Unsatisfactory and Organic Material: Remove organic matter, sod, muck, rubbish, and unsuitable soils under embankments and under pavements, slabs on grade, and all areas indicated to have new grading. Typical depth of removal of such material shall be 6 to 12 inches. 3.3 EXCAVATION A. Excavate to contours and dimensions indicated. Keep excavations free from water while construction is in progress. Notify the Owner's Representative immediately in writing in the event that it becomes necessary to remove rock, hard material, or contaminated material defined as unsatisfactory to a depth greater than indicated. Refill excavations cut below the depths indicated with general or structural fill and compact as specified herein. Excavate soil disturbed or weakened by construction operations or soils soften from exposure to weather. Refill with structural fill and compact as specified herein. B. Excavations for Structures and Pavements: Excavate existing remediation soil material beneath the building and pavements as indicated and replace with structural fill. C. Shoring: Shore excavations as required. D. Blasting will not be permitted. 3.4 TRENCHING A. Keep excavations free from water while construction is in progress. Notify the Owner's Representative immediately in writing if it becomes necessary to remove rock or hard, unstable, or otherwise unsatisfactory material to a depth greater than indicated. Make trench sides as nearly vertical as practicable except where sloping of sides is allowed. Sides of trenches shall not be sloped from the bottom of the trench up to the elevation of the top of the 217021 B-52 MEMORIAL PARK PH 2 102318 THE MUSEUM OF FLIGHT BUILDING AND PUBLIC WORKS PERMIT EARTHWORK SECTION 31 00 00 - 7 pipe, conduit, or duct. Excavate ledge rock, boulders, and other unyielding material to an overdepth at least 6 inches and a maximum of 2 feet below the bottom of the pipe, conduit, duct, and appurtenances unless otherwise indicated or specified. As required, place a minimum thickness of 12 inches of structural fill topped by bedding materials to stabilize the bottom of the excavation. Blasting will not be permitted. Overexcavate soft, loose, organic and unsuitable material a minimum of 2 feet below the pipe invert elevation and replace with trench backfill material. Use bedding material placed in 6 -inch maximum layers to refill overdepths to the proper grade. At the Contractor's option, the excavations may be cut to an overdepth of not less than 8 inches and refilled to required grade as specified. Grade bottom of trenches accurately to provide uniform bearing and support for each section of pipe, conduit, duct, or structure on undisturbed soil, or bedding material as indicated or specified at every point along its entire length except for portions where it is necessary to excavate for bell holes and for making proper joints. Dig bell holes and depressions for joints after trench has been graded. Dimension of bell holes shall be as required for properly making the particular type of joint to ensure that the bell does not bear on the bottom of the excavation. Trench dimensions shall be as indicated or specified. B. Shoring: Shore excavations as required to prevent injury to persons and damage to structures. Arrange shoring to preclude injurious caving during removal. Obtain approval from the Owner's Representative prior to removing shoring or bracing in excavations adjacent to structural elements. 3.5 BEDDING A. Of materials and depths as indicated or specified for utility lines and utility structures. Place bedding in 6 -inch maximum loose lifts. Provide uniform and continuous support for each section of structure except at bell holes or depressions necessary for making proper joints. Bring up evenly on each side and along the full length of the pipe, conduit, duct or structure. Ensure that no damage is done to the utility or its protective coating. Ensure that the material placed is tamped firmly under pipe haunches. 3.6 BURIED WARNING AND IDENTIFICATION TAPE A. Install tape in accordance with manufacturer's recommendations except as modified herein. Bury tape at the depth indicated. 3.7 BURIED DETECTION WIRE A. Bury detection wire directly above non-metallic piping at a distance not to exceed 12 inches above the top of pipe. The wire shall extend continuously and unbroken, from structure to structure. The ends of the wire shall terminate inside the structure at each end of the pipe, with a minimum of 3 feet of wire, coiled, remaining accessible in each manhole or catch basin. The wire shall remain insulated over its entire length. 3.8 BORROW MATERIALS A. Select borrow materials to meet requirements and conditions of the particular fill materials to be used. Obtain borrow materials from approved sources off the project site. 3.9 FILLING AND BACKFILLING A. Subgrade Preparation: 1. Subgrade Proofrolling: After stripping and removal of topsoil or other overburden, proofroll the existing subgrade with at least two passes of a minimum 15 -ton vibratory 217021 B-52 MEMORIAL PARK PH 2 102318 THE MUSEUM OF FLIGHT BUILDING AND PUBLIC WORKS PERMIT EARTHWORK SECTION 31 00 00 - 8 roller or fully loaded, 10 cubic yard dump truck. Operate the roller or truck in a systematic manner to assure the number of passes over all areas, and at speeds between 2.5 and 3.5 miles per hour. Proofrolling shall be done in the presence of the Owner's Representative. 2. Perform proof rolling only when weather conditions permit. Do not proof roll wet or saturated subgrades. If subgrade soils are to wet to proof roll, then probing shall be used to evaluate the subgrade. Materials degraded by proof rolling a wet or saturated subgrade shall be replaced by the Contractor as directed by the Owner's Representative at no cost to the Owner. Notify the Owner's Representative 3 days prior to proof rolling. B. Fill and Backfill: Place required backfill material adjacent to structures and compact in a manner that prevents wedging action or eccentric loading upon or against the structures. Step or serrate slopes bounding or within areas to be backfilled to prevent sliding of the fill. Moisten or aerate material as necessary to provide the moisture content that will readily facilitate obtaining the specified compaction with the equipment used. Fill and backfill shall be placed in uniform horizontal layers not to exceed 8 inches loose thickness for heavy equipment compactors and 4 inches loose thickness for hand -operated mechanical compactors. Do not place material on surfaces that are muddy, frozen, or contain frost. Do not use equipment for backfilling operations or for the formation of embankments against structures that will overload the structure. Backfilling against concrete will be done only after the concrete has attained its 28 -day compressive strength. 1. General Fill: Place general fill where required in uniform horizontal layers of no more than 8 inches loose thickness for heavy equipment compactors and 6 inches for hand - operated mechanical compactors. Place material on firm, non -yielding subgrade soils. Do not place material on surfaces that are muddy, frozen, or contain frost. Compact with equipment well suited to the soil being compacted. Moisten or aerate material as necessary to maintain the moisture content within 3 percent of the optimum moisture content. Compact each lift as specified herein before placing the overlaying lift. Compaction shall be accomplished continuously over the entire area. Sufficient passes shall be made to ensure that specified density is obtained. 2. Structural Fill: Place structural fill where iidicated in uniform horizontal layers of no more than 8 inches loose thickness for heavy equipment compactors and 6 inches for hand - operated mechanical compactors. Place material on firm, non -yielding subgrade soils. Do not place material on surfaces that are muddy, frozen, or contain frost. Compact with equipment well suited to the soil being compacted. Moisten or aerate material as necessary to maintain the moisture content within 2 percent of the optimum moisture content. Compact each lift as specified herein before placing the overlaying lift. Compaction shall be accomplished continuously over the entire area. Sufficient passes shall be made to ensure that specified density is obtained. C. Trench Backfill for Utilities: Construct backfill (final backfill) for utility lines and other utility appurtenances using the material and compaction requirements specified herein for the adjacent or overlying work. Bedding and initial) backfill requirements are specified in this section. Backfilling against concrete will be done only after the concrete has attained its 28 -day compressive strength D. Weather Limitations: Fill and backfill shall not be constructed when weather conditions detrimentally affect the quality of the finished course. Place fill and backfill only if the atmospheric temperature is above freezing in the shade and is rising. Do not construct fill and backfill in the rain or on saturated subgrades. If weather conditions are windy, hot or arid, with high rate of evaporation, schedule the placement in cooler portions of the day and furnish equipment to add moisture to the fill or backfill during and after placement. 217021 B-52 MEMORIAL PARK PH 2 102318 THE MUSEUM OF FLIGHT BUILDING AND PUBLIC WORKS PERMIT EARTHWORK SECTION 31 00 00 - 9 3.10 CONTROLLED DENSITY FILL (CDF) A. Controlled density fill (CDF) shall be placed where indicated or in lieu of other backfill materials as approved by the Owners Representative. B. CDF shall not be placed on frozen ground. C. CDF batching, mixing and placing shall commence only when weather conditions are favorable. The ambient temperature must be at least 34 degrees F and rising. At the time of placement, CDF shall have a minimum temperature of 40 degrees F. Mixing and placing of CDF shall stop when the ambient temperature is 38 degrees F or less and falling. Each CDF filling stage shall be as continuous an operation as is practical. D. CDF shall be discharged from the mixer by any reasonable means into the area to be filled. Each lift of CDF shall be brought up to a uniform elevation. 3.11 COMPACTION A. Use hand -operated, plate -type, vibratory, or other suitable hand tampers in areas not accessible to larger rollers or compactors. Avoid damaging pipes and protective pipe coatings. Compact material in accordance with the following unless otherwise specified. If necessary, alter, change, or modify selected equipment or compaction methods to meet specified compaction requirements. B. Compact each layer or lift of material specified so that the in-place density tested is not less than the percentage of maximum density specified in Table 1 below. For utilities under structures and pavements compact backfill as specified under paragraph entitled "Special Earthwork Installation Requirements." Table 1. Compaction Percent ASTM D 1557 Material Maximum Density Upper 2 Feet of Trench Backfill Below Pavements and Sidewalks 95 Trench Backfill Below Upper 2 Feet Under Pavements and 90 Sidewalks • Fill Below Landscape Areas 85 Pipe Bedding 95 3.12 SPECIAL EARTHWORK INSTALLATION REQUIREMENTS A. Manholes and Other Appurtenances: Provide at least 12 inches clear from outer surfaces to the embankment or shoring. Remove rock as specified herein. Remove unstable soil that is incapable of supporting the structure to an overdepth of one foot and refill with bedding material to the proper elevation. Refill overdepths with bedding material to the required grade and compact to 95 percent of ASTM D 1557 maximum density. B. Compaction for Structures and Pavements: Place backfill in 4 -inch maximum loose lifts for hand -operated mechanical compactors. If a vibratory roller is used for compaction of backfill, the loose lift thickness can be increased to 8 inches maximum. Compact all backfill surrounding pipes, ducts, conduits, and other structures as specified in this Section. 217021 B-52 MEMORIAL PARK PH 2 102318 THE MUSEUM OF FLIGHT BUILDING AND PUBLIC WORKS PERMIT EARTHWORK SECTION 31 00 00 - 10 1. Backfill to permit the rolling and compacting of the completed excavation with the adjoining material, providing the specified density necessary to enable paving of the area immediately after backfilling has been completed. 3.13 FINISH OPERATIONS A. Finished Site Grading: Grade to finished grades indicated within 0.10 foot. Grade areas to drain water away from structures and to provide suitable surfaces for mowing machines. Existing grades which are to remain but are disturbed by the Contractor's operations shall be restored as specified herein. B. Finishing Subgrades: Finish surface of top lift of fill or top of subgrade to the elevation and cross section indicated. Finished surface shall be smooth and of uniform texture. Lightly scarify or blade the finished surface to bring the finished surface to within 0.10 foot of the indicated grade and to eliminate imprints made by compaction and shaping equipment. Surface shall show no deviations in excess of 3/8 inch when tested with a 10 -foot straightedge. C. Disposition of Surplus Material: Surplus or other soil material not required or suitable for filling, backfilling, or embankment shall be removed from the project site. D. Protection of Surfaces: Protect newly graded areas from traffic, erosion, and settlements that may occur and as required in the Section 01 57 13, "Temporary Erosion and Sediment Control," and as specified in the paragraph entitled "Protection and Restoration of Surfaces." Repair or reestablish damaged grades, elevations, or slopes prior to acceptance of work. 3.14 FIELD QUALITY CONTROL A. In -Place Densities: Determine field in-place density in accordance with ASTM D 6938. Check the calibration curves and adjust using only the sand cone method as described in ASTM D 1556. Check the calibration curves furnished with the moisture gauges along with density calibration checks as described in ASTM D 6938; check the calibration of both the density and moisture gauges at the beginning of a job on each different type of material encountered. When test results indicate, as determined by the Owner's Representative, that compaction is not as specified, remove the material, replace, and recompact to meet specification requirements. Perform tests on recompacted areas to determine conformance with specification requirements. In -Place Density Test Frequency: 1. Subgrade: One test for every 1,000 square feet or fraction thereof. 2. Fill and Backfill: One test per lift for every 1,000 square feet or fraction thereof. 3. Trench Bedding and Backfill: One test per lift for every 50 feet of trench or fraction thereof. 4. Appurtenance Structures: One test per lift per 100 square feet or fraction thereof. END OF SECTION 217021 B-52 MEMORIAL PARK PH 2 102318 THE MUSEUM OF FLIGHT BUILDING AND PUBLIC WORKS PERMIT CLEARING AND GRUBBING SECTION 31 11 00 - 1 PART1 GENERAL 1.1 SUMMARY A. This section includes requirements for clearing and grubbing of trees, shrubs and organic material and the disposal of cleared and grubbed materials. 1.2 RELATED SECTIONS A. Section 31 00 00, "Earthwork" PART 2 PRODUCTS -- NOT USED PART 3 EXECUTION 3.1 PROTECTION A. Roads: Keep roads free of dirt and debris at all times. B. Trees, Shrubs, and Existing Facilities: Protect landscape areas and trees to remain as indicated on the landscape drawings. C. Utility Lines: Protect existing utility lines that are indicated to remain from damage. Notify the Owner's Representative immediately of damage to or an encounter with an unknown existing utility line. The Contractor shall be responsible for the repairs of damage to existing utility lines that are indicated or made known to the Contractor prior to start of clearing and grubbing operations. When utility lines, which are to be removed, are encountered within the area of operations, notify the Engineer in ample time to minimize interruption of the service. 3.2 CLEARING A. Clearing shall consist of felling, trimming, and cutting of the existing trees into sections and the satisfactory disposal of the trees and other vegetation designated for removal, including brush and rubbish occurring within the areas to be cleared. Cut off flush with or below the original ground surface, trees, stumps, roots, brush, and other vegetation in areas to be cleared except for trees and vegetation indicated or directed to be left standing. Clearing shall include the disposal of any rubbish or man made materials encountered. 3.3 TREE REMOVAL A. Where indicated, remove designated trees, stumps, and grub roots. 3.4 GRUBBING A. Remove and dispose of roots larger than 3 inches in diameter, and the matted roots from the indicated grubbing areas. Excavate this material together with organic and metallic debris, brush, and refuse and remove to a depth of not less than 18 inches below the original soil surface in areas to be grubbed and in areas indicated as construction areas under this contract. Fill depressions made by grubbing with suitable material and in accordance with the requirements specified in Section 31 00 00, "Earthwork." 2217021 B-52 MEMORIAL PARK PH 2 102318 THE MUSEUM OF FLIGHT BUILDING AND PUBLIC WORKS PERMIT CLEARING AND GRUBBING SECTION 31 11 00 - 2 3.5 DISPOSAL OF CLEARED AND GRUBBED MATERIAL A. All timber on the project site noted for clearing and grubbing shall become the property of the contractor and shall be removed from the site. END OF SECTION 2217021 B-52 MEMORIAL PARK PH 2 102318 THE MUSEUM OF FLIGHT BUILDING AND PUBLIC WORKS PERMIT TREE PROTECTION SECTION 315639 - 1 PART 1 - GENERAL 1.1 RELATED DOCUMENTS A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section. 1.2 SUMMARY A. Work of this Section consists of the protection, trimming, and maintenance of existing trees, shrubs, and groundcover that interfere with or are affected by execution of the Work, whether temporary or permanent construction. B. Related Documents and Sections: Examine Contract Documents for requirements that directly affect or are affected by Work of this Section. A list of those Documents and Sections include, but is not limited to the following: 1. Drawings and general provisions of the Contract, including General and Supplementary Conditions and General Requirements, DIVISION 01 Specification Sections. 2. Division 01 Section "Summary' for limits placed on Contractor's use of the site. 3. Division 01 Section "Temporary Facilities and Controls" for temporary tree protection. 4. Division 31 Section "Site Clearing" for removal limits of trees, shrubs, and other plantings affected by new construction. 5. Division 31 "Site Clearing" for temporary erosion and sedimentation control measures and removal of above- and below -grade improvements and utilities. 6. Division 31 "Landscape Demolition and Salvage" for demolition and chipping of existing trees and shrubs, salvage of trees, and stripping and stocking topsoil. 1.3 DEFINITIONS A. Tree Protection Zone: Area surrounding individual trees or groups of trees to remain during construction, and defined by the drip line of individual trees or the perimeter drip line of groups of trees, unless otherwise indicated. 1.4 SUBMITTALS A. Product Data: For each type of product indicated. B. Tree Pruning Schedule: Written schedule from arborist detailing scope and extent of pruning trees to remain that interfere with or are affected by construction. C. Qualification Data: For tree service firm and arborist. D. Certification: From arborist, certifying that trees indicated to remain have been protected during construction according to recognized standards and that trees were promptly and properly treated and repaired when damaged. E. Maintenance Recommendations: From arborist, for care and protection of trees affected by construction during and after completing the Work. 217021 B-52 MEMORIAL PARK PH2 10-23-18 MUSEUM OF FLIGHT PERMIT SUBMITTAL TREE PROTECTION SECTION 315639 - 2 1.5 QUALITY ASSURANCE A. Field review all trees and plants to be protected that have been tagged or designated by Owner's Representative. Plants to protect will be indicated on the Drawings. B. Before tree protection and trimming operations begin, meet with representatives of authorities having jurisdiction, Owner, Architect, consultants, and other concerned entities to review tree protection and trimming procedures and responsibilities. C. Tree Service Firm Qualifications: An experienced tree service firm that has successfully completed tree protection and trimming work similar to that required for this Project and that will assign an experienced, qualified arborist to Project site during execution of tree protection and trimming. D. Arborist Qualifications: An arborist certified by ISA or licensed in the jurisdiction where Project is located. Engage arborist prior to commencement of demolition work. E. Tree Pruning Standard: Comply with ANSI A300 (Part 1), "Tree, Shrub, and Other Woody Plant Maintenance --Standard Practices (Pruning)." F. Preinstallation Conference: Conduct conference at Project site to comply with requirements in Division 01 Section "Project Management and Coordination. PART 2 — PRODUCTS 2.1 MATERIALS A. Drainage Fill: Selected crushed stone, or crushed or uncrushed gravel, washed, ASTM D 448, Size 24, with 90 to 100 percent passing a 2 -1/2 -inch sieve and not more than 10 percent passing a 3/4 -inch sieve. B. Planting Soil: Refer to Section 329100, Planting Soil C. Filter Fabric: Manufacturer's standard, nonwoven, pervious, geotextile fabric of polypropylene, nylon, or polyester fibers. D. Chain -Link Fence: Metallic -coated steel chain-link fence fabric of 0.120 -inch- diameter wire; a minimum of 6 feet high; with 1.9 -inch- diameter line posts; 2 -3/8 -inch- diameter terminal and corner posts; 1 -5/8 -inch diameter top rail; and 0.177 -inch -diameter bottom tension wire; with tie wires, hog ring ties, and other accessories for a complete fence system. E. Treatment Materials: 1. Anti-dessicant: 'Wiltpruf as manufactured by Wiltpruf Products, Inc. P.O. Box 4280, Greenwich, CT 06830, (203) 531-4740, or equal. 2. Hog fuel: wood chips free of non -wood material. 3. Wetting Agent: PHC BioPakT"' with YuccahTM 217021 B-52 MEMORIAL PARK PH2 10-23-18 MUSEUM OF FLIGHT PERMIT SUBMITTAL TREE PROTECTION SECTION 315639 - 3 PART 3 - EXECUTION 3.1 PREPARATION A. Temporary Fencing: Install temporary fencing around tree protection zones to protect remaining trees and vegetation from construction damage. Refer to Tukwila Municipal Code section 18.44.080 for fencing requirements. Review fence locations with Owner and Arborist prior to installation. Maintain temporary fence and remove when construction is complete. 1. Install chain-link fence according to ASTM F 567 and manufacturer's written instructions. B. Protect tree root systems from damage caused by runoff or spillage of noxious materials while mixing, placing, or storing construction materials. Protect root systems from ponding, eroding, or excessive wetting caused by dewatering operations. C: Where clearing and grubbing has been directed within tree protection zones, place 4- to 6 -inch thick layer of mulch within drip line of trees to remain. 1. Do not place mulch over existing vegetation in tree protection zones that have not been cleared and grubbed. 2. Do not place mulch within 6 inches of tree trunks. 3. Mulch to be wood chips created from clearing and grubbing operation, hog fuel, or as approved. D. Maintain tree protection zones free of weeds and trash. E. Do not allow fires within tree protection zones. 3.2 WORK WITHIN DRIPLINE A. Where work must occur within the tree protection zone, the Contractor shall employ all methods to minimize adverse impact to these existing trees including limbs and roots. These methods include but are not limited to: 1. Temporary chain link construction fencing. 2. Temporary tie-up of low limbs. 3. Application of a 4- to 6 -inch thick layer of mulch (or wood chips salvaged from clearing and grubbing operations) within the drip -line of trees. 4. Timber or steel planking for protection of surface roots from Equipment. 5. Tree root pruning or other tree root treatment as directed by the Engineer and/or Urban Forester. B. The Contractor shall notify the Landscape Architect of any construction work within the drip -line of trees at least (5) Working Days before the scheduled activity. C. No storage of equipment or materials shall be allowed within the dripline of trees not designated for removal. Steel planking, or timber planking made of 4 -inch thick material, each plank covering a minimum of 8 square feet, shall be used to support backhoe and other Equipment stabilizers when set within the drip -line of a tree to remain. D. Pavement removal and placement operations that occur within the dripline shall be reviewed, approved, and performed under the supervision of Arborist. 217021 13-52 MEMORIAL PARK PH2 10-23-18 MUSEUM OF FLIGHT PERMIT SUBMITTAL TREE PROTECTION SECTION 315639 - 4 3.3 EXCAVATION AROUND TREES A. Tree protection where construction occurs within the dripline of existing trees not designated for removal shalll be in accordance with the City of Tukwila Municipal Code 18.44.080 (most recent edition), and defined zone clearance requirements. B. Where trenching for utilities is required within drip line, tunnel under or around roots by hand digging. Do not cut main lateral roots or tap roots. The Contractor shall notify the Owner's representative prior to cutting roots over 3/4" in diameter. Certified arborist shall cut roots larger than 3/4". Contractor may be allowed to prune roots with approval and direction from certified arborist. C. Do not leave roots exposed to sun or drying for more than 24 hours. Protect all exposed roots with moist soil backfill as soon as possible. D. Where excavating for new construction is required within drip line of tree, excavate by hand to minimize damage to roots and perform as follows: 1. Use narrow tine spading forks and comb soil to expose roots. 2. If main lateral roots are immediately adjacent to location of new construction cut roots three (3) inches from new construction. 3. Do not allow exposed roots to dry out before permanent backfill is placed. 4. Provide temporary earth cover, or pack with peat moss and wrap with burlap. 5. Water and maintain in moist condition until covered with backfill. E. Air spading 1. Engage a certified arborist to air spade. Air spade to create planting pockets for new understory plantings. Coordinate number of pockets with quantity of plants to be installed per planting plan. 2. Backfill with imported topsoil per Soils specification. 3.4 REGRADING A. Grade Lowering: Where new finish grade is indicated below existing grade around trees, slope grade away from trees as recommended by Arborist. 1. Root Pruning: Prune tree roots exposed during grade lowering. Do not cut main lateral roots or taproots; cut only smaller roots. Cut roots with sharp pruning instruments; do not break or chop. B. Minor Fill: Where existing grade is 6 inches or (less below elevation of finish grade, fill with topsoil. Place topsoil in a single uncompacted layer and hand grade to required finish elevations. 3.5 TRIMMING OF EXISTING TREES A. General: Engage a qualified arborist to selectively remove branches from trees. Do not prune unless approved and directed by the Owner's representative. B. Pruning: Cut branches with sharp pruning instruments and do no break or chop. Prune to outside edge of branch collar per ANSI pruning standards. 217021 B-52 MEMORIAL PARK PH2 10-23-18 MUSEUM OF FLIGHT PERMIT SUBMITTAL TREE PROTECTION SECTION 315639 - 5 C. Tree removal or tree trimming within 10 feet of any overhead utility line requires the Contractor to make the notification specified in City of Seattle Standard Specifications (most recent edition), Section #1-07.28. 3.6 TREE REPAIR AND REPLACEMENT A. Plant material protected within fencing that becomes damaged or dies shall be replaced as required by Tukwila Municipal Code section 18.44.080. B. Contractor to engage and pay for a certified and licensed arborist to perform tree repair work damaged by construction operations. Make repairs promptly after damage occurs to prevent progressive deterioration of damaged trees. C. Damaged and destroyed trees which cannot be replaced shall be paid for at the rate of $50.00 per square inch of cross sectional area measured three (3) feet above existing grade for trees up to and including six (6) inch caliper. This amount shall be credited to the Owner. Remove any damaged and destroyed trees from the site as determined by the arborist to be incapable of restoration to a normal growth pattern. Grub stumps and repair the ground surface. All costs shall be borne by the Contractor. D. Replacement plants shall be in good health and approved by Owner before installation. 3.7 IRRIGATION OF TREES DURING CONSTRUCTION A. Ensure trees are irrigated during construction to maintain health of the tree. B. Contractor to establish temporary automatic irrigation system. Temporary system may tie into adjacent Owner irrigation mainlines. System to be "Design Build" and shall operate through the duration of construction. C. Water trees deeply at regular intervals and a minimum of once every two weeks during the growing season (March through October). The water should penetrate the soil to a depth of at least six (6) inches. D. Take necessary precautions to prevent over -watering, excessive runoff, and erosion from occurring. E. Do not irrigate if specified irrigation requirements occur naturally through rainfall. 3.8 DISPOSAL OF WASTE MATERIAL A. Burning is not permitted. B. Disposal: Remove excess excavated material and displaced trees from Owner's property. END OF SECTION 217021 B-52 MEMORIAL PARK PH2 10-23-18 MUSEUM OF FLIGHT PERMIT SUBMITTAL AGGREGATE BASE COURSES SECTION 32 11 23 - 1 PART1 GENERAL 1.1 SUMMARY A. Section Includes: Requirements for materials, placement and testing of base course under all roads, drives, pavements and walks. 1.2 REFERENCES A. The publications listed below form a part of this specification to the extent referenced. The publications are referred to in the text by the basic designation only. B. American Society for Testing and Materials (ASTM): 1. ASTM D 1556 Density and Unit Weight of Soil in Place by the Sand -Cone Method 2. ASTM D 1557 Laboratory Compaction Characteristics of Soil Using Modified Effort (56,000 ft-Ibf/ft) 3. ASTM D 6938 Standard Test Method for In -Place Density and Water Content of Soil and Soil -Aggregate by Nuclear Methods (Shallow Depth) C. Washington State Department of Transportation (WSDOT): 1. SS -1 (2018) Standard Specifications for Road, Bridge, and Municipal Construction 1.3 SUBMITTALS A. Submit the following in accordance with Section 013300, "Submittal Procedures." 1. Factory Test Reports: Submit test reports for gradation of base course material taken at the source. 2. Field Test Reports: Submit test results for smoothness, density and thickness of in-place base course. 1.4 DELIVERY AND STORAGE A. Inspect materials delivered to site for damage and store as to prevent segregation and contamination. 1.5 WEATHER LIMITATIONS A. Do not construct base course when atmospheric temperature is below 35 degrees Fahrenheit or when rainfall or other weather conditions detrimentally affect the quality of the finished course. 1.6 CONSTRUCTION EQUIPMENT A. Equipment shall be dependable and adequate for the purpose intended. Maintain equipment in satisfactory and safe operating condition. Subject to approval, special equipment dictated by local conditions may be used. Calibrated equipment, such as scales, batching equipment, spreaders, and similar items, shall have been recalibrated by an approved calibration laboratory within 12 months of commencing work. 217021 B-52 MEMORIAL PARK PH 2 102318 THE MUSEUM OF FLIGHT BUILDING AND PUBLIC WORKS PERMIT AGGREGATE BASE COURSES SECTION 32 11 23 - 2 PART2 PRODUCTS 2.1 MATERIALS A. Aggregates: Provide base course in accordance with applicable requirements of SS -1 except where specified otherwise. 1. Base course materials shall be as specified SS -1, Section 9-03.9(3) "Crushed Surfacing Base Course." PART 3 EXECUTION 3.1 BASE COURSE A. Construct the graded aggregate base course on a previously constructed subbase course, as indicated. Provide line and grade stakes for control. Place grade stakes in lanes parallel to the centerline of areas to be paved and space for string lining or other control methods. The base course shall consist of aggregate processed, deposited, spread, and compacted on a prepared surface. The Contractor shall be responsible for protection of completed areas against detrimental effects. Recondition, reshape, and recompact areas damaged by freezing, rainfall, or other weather conditions. 3.2 PLACING A. Do not dump mixed materials in piles, but place on prepared subbase in layers of uniform thickness with a spreader. When a compacted course 6 inches in thickness is required, place material in a single layer. When a compacted course in excess of 6 inches is required, place material in layers of equal thickness. Do not exceed 6 inches or have less than 3 inches in thickness for any compacted layer. Place layers so that when compacted, they will be true to grades or levels required with the least possible surface disturbance. Where the base course is constructed in more than one layer, clean previously constructed layers of loose and foreign matter. Maintain material water content during the placing period to obtain the compaction specified. Make adjustments in placing procedures or equipment to obtain true grades, to minimize segregation and degradation, to reduce or increase water content, and to insure a satisfactory base course. 3.3 COMPACTING AND FINISHING A. Immediately following the placing, spread the finished mixture uniformly in a layer and bring to optimum moisture content. The loose thickness and the surface of the layer shall be such that the specified density and the required thickness shall be obtained after compaction. Compact the layer with steel -faced, vibrating or pneumatic -tired rollers, or other suitable compacting equipment or combinations thereof. Continue compacting until the layer is compacted through the full depth to a field density of at a minimum of 95 percent of the ASTM D 1557 maximum density. In areas not accessible to rollers or compactors, compact the mixture with mechanical hand tampers. If the mixture is excessively moistened by rain, aerate by blade graders, or other suitable equipment. Aerate until the moisture content of the material is that needed to obtain the required density. Finish the surface of the layer by a combination of rolling and blading. Final surface shall be smooth and free from waves, irregularities, and ruts or soft yielding spots. 217021 B-52 MEMORIAL PARK PH 2 102318 THE MUSEUM OF FLIGHT BUILDING AND PUBLIC WORKS PERMIT AGGREGATE BASE COURSES SECTION 32 11 23 - 3 3.4 PROOF ROLLING A. In addition to compacting the base course to the required density, proof roll the top surface of the completed base course by making eight coverages with a heavy rubber -tired roller having four tires with each tire loaded to 30,000 pounds or more and inflated to at least 150 psi. Make four coverages over other areas to be paved. A coverage is defined as one application of one tire print over each point in the surface of the designated area. When under the action of the proof rolling, the base course yields, pumps, or otherwise fails, remove, replace with suitable materials, and recompact materials in the base course or in the underlying layers indicated to be unsatisfactory. The speed of the roller shall not exceed 5 miles per hour. Obtain approval upon completion of the proof rolling of the base course. 3.5 FINISHING AT EDGES OF BASE COURSE A. Place earth or other approved materials along the edges of the base course in such quantity that it will compact to the thickness of the course being constructed. When the course is being constructed in two or more layers, place material to the thickness of each layer. In each operation, allow at least a one -foot width of the shoulder to be rolled and compacted simultaneously with the rolling and compacting of each layer. 3.6 FIELD QUALITY CONTROL A. Approve materials and material sources in advance of the use of such materials in the work. Replace base where samples are removed. B. Testing: 1. Smoothness Tests: Test with a 10 -foot straightedge, applied parallel with and at right angles to the center line of the paved area. Correct deviations in the surface in excess of 3/8 inch by loosening, adding or removing material, reshaping, watering, and compacting. The smoothness requirements specified herein apply only to the top layer when base course is constructed in more than one layer. 2. Field Density Tests: ASTM D 6938. Take one test for each 500 square yards of each layer of base course. 3. Laboratory Density Tests: In accordance with ASTM D 1557. 4. Thickness Tests: Measure thickness of base course at intervals such that there will be a depth measurement for at least each 500 square yards of complete base course. Make depth measurements by test holes, at least 3 inches in diameter, through the base course. Where base course deficiency is more than 1/2 inch, correct by scarifying, adding mixture of proper gradation, reblading, and recompacting. Where the measured thickness is more than 1/2 inch thicker than indicated, consider it as the indicated thickness plus 1/2 inch for determining the average. The average thickness is the average of the depth measurements and shall not underrun the thickness indicated. 3.7 MAINTENANCE A. After construction is completed, maintain the base course throughout, except where portion of the succeeding course is under construction thereon. Maintenance includes drainage, rolling, shaping, and watering, as necessary, to maintain the course in proper condition. Correct deficiencies in thickness, composition, construction, smoothness, and density, which develop during the maintenance, to conform to the requirements specified herein. Maintain sufficient moisture by Tight sprinkling with water at the surface to prevent a dusty condition. END OF SECTION 217021 B-52 MEMORIAL PARK PH 2 102318 THE MUSEUM OF FLIGHT BUILDING AND PUBLIC WORKS PERMIT TACK COATS SECTION 32 12 10 - 1 PART1 GENERAL 1.1 SUMMARY A. Section Includes: Requirements for materials and placement of tack coat. 1.2 REFERENCES A. The latest versions (unless noted otherwise) of publications listed below form a part of this specification to the extent referenced. The publications are referred to in the text by the basic designation only. B. American Association of State Highway and Transportation Officials (AASHTO): 1. AASHTO T102: Spot Test of Asphaltic Materials C. Washington State Department of Transportation (WSDOT): 1. SS -1: (2018) Standard Specifications for Road, Bridge, and Municipal Construction 1.3 SUBMITTALS A. Submit the following in accordance with Section 01 33 00, "Submittal Procedures." Certification stating that emulsified asphalt meets the requirements of the specification. 1.4 DELIVERY AND STORAGE A. Inspect the materials delivered to the site for contamination and damage. Unload and store the materials with a minimum of handling. 1.5 WEATHER LIMITATIONS A. Apply the tack coat only when the surface is dry. Apply the tack coat only when the ambient temperature is 50 degrees Fahrenheit or above and when the temperature has not been below 35 degrees Fahrenheit for 12 hours immediately prior to application, unless otherwise directed. PART2 PRODUCTS 2.1 MATERIALS A. Bituminous material for the tack coat shall be emulsified asphalt. B. Emulsified Asphalt: SS -1, Section 9-02.1(6). Type CSS -1. Dilute the emulsified asphalt with equal parts of water. The base asphalt used to manufacture the emulsion shall show a negative spot when tested in accordance with AASHTO T102 using standard naphtha. 2.2 CONSTRUCTION EQUIPMENT A. Provide equipment dependable and adequate for the purpose intended and properly maintained in satisfactory and safe operating condition. Calibrated equipment such as asphalt 217021 B-52 MEMORIAL PARK PH 2 102318 THE MUSEUM OF FLIGHT BUILDING AND PUBLIC WORKS PERMIT TACK COATS SECTION 32 12 10 - 2 distributors, scales, batching equipment, spreaders and similar equipment, shall have been recalibrated by a calibration laboratory within 12 months prior to commencing work. B. Bituminous Distributor: The bituminous distributor shall be designed and equipped to distribute the bituminous material uniformly at even heat on variable widths of surface at readily determined and controlled rates from 0.05 to 2.0 gallons per square yard, with a pressure range of 25 to 75 pounds per square inch and with an allowable variation not to exceed 5 percent from any specified rate. Distributor equipment shall include a separate power unit for the bitumen pump, full -circulation spray bars, acoumeter, pressure gauges, volume -measuring devices, adequate heaters for heating the materials to the proper application temperature, a thermometer for reading the temperature of the tank contents, and a hose and spray nozzle attachment suitable for applying bituminous material to spots unavoidably missed by the distributor and to areas inaccessible to the distributor. The distributor shall be equipped to circulate and agitate the bituminous material during the heating process. C. Heating Equipment for Storage Tanks: The equipment for heating the bituminous material shall be steam, electric, or hot oil heaters. Steam heaters shall consist of steam coils and equipment for producing steam, so designed that the steam cannot get into the material. An armored thermometer with a temperature range from 40 degrees Fahrenheit to 400 degrees Fahrenheit shall be fixed to the tank so that the temperature of the bituminous material may be determined at all times. D. Brooms and Blowers: Brooms and blowers shall be of the power type suitable for cleaning the surfaces for application of the bituminous material. PART 3 EXECUTION 3.1 PREPARATION OF SURFACE A. Immediately before applying the tack coat, remove loose material, dirt, clay, and other objectionable material from the surface to be treated by a power broom or blower supplemented with hand brooms. After the cleaning operation and prior to the application of the tack coat, inspect the area to be paved to determine the fitness of the area to receive the bituminous material. 3.2 APPLICATIION OF BITUMINOUS MATERIAL A. Apply the tack coat when the surface to be treated is dry. Immediately following the preparation of the surface for treatment, apply the bituminous material by means of the bituminous distributor, within the limits of temperature specified herein and at a rate of not less than not less than 0.05 gallon nor more than 0.15 gallon of diluted emulsion per square yard. Apply the bituminous material so that uniform distribution is obtained over the entire surface to be treated. Treat lightly coated areas and spots missed by the distributor with the bituminous material. Following the application of bituminous material, allow the surface to cure without being disturbed for period of time necessary to permit setting of the tack coat. Apply the bituminous tack coat only as far in advance of the placing of the overlying layer as required for that day's operation. Maintain and protect the treated surface from damage until the succeeding course of pavement is placed. B. Application Temperature for Emulsified Asphallt: Between 75 degrees Fahrenheit and 130 degrees Fahrenheit. 217021 B-52 MEMORIAL PARK PH 2 102318 THE MUSEUM OF FLIGHT BUILDING AND PUBLIC WORKS PERMIT TACK COATS SIECTION 32 12 10 - 3 3.3 TRAFFIC CONTROLS A. Keep traffic off surfaces freshly treated with bituminous material. Provide sufficient warning signs and barricades so that traffic will not travel over freshly treated surfaces. END OF SECTION 217021 B-52 MEMORIAL PARK PH 2 102318 THE MUSEUM OF FLIGHT BUILDING AND PUBLIC WORKS PERMIT ASPHALT PAVING SECTION 32 12 16 - 1 PART1 GENERAL 1.1 SUMMARY A. Section Inclludes: Requirements for materials, placement and testing of asphalt concrete pavement. 1.2 RELATED SECTIONS A. Section 31 00 00, "Earthwork" B. Section 32 11 23, "Aggregate Base Courses" C. Section 3212 10, "Tack Coats" 1.3 REFERENCES A. The latest versions (unless noted otherwise) ot'the publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only. B. American Association of State Highway and Transportation Officials (AASHTO): 1. AASHTO T209: Method of Test for Maximum Specific Gravity of Bituminous Paving Mixtures - "Rice Density." C. Washington State Department of Transportation (WSDOT): 1. SS -1: (2018) Standard Specifications for Road, Bridge, and Municipal Construction 2. TM -8: In -Place Density of Hot Mix Asphalt Using the Nuclear Moisture -Density Gauge 1.4 SUBMITTALS A. Submit the following in accordance with Section 01 33 00, "Submittal Procedures." B. Mix Delivery Record Data: Record and submit the following information to each load of mix delivered to the job site. Submit within one day after delivery. 1. Truck No. 2. Time In 3. Time Out 4. Tonnage and Discharge Temperature 5. Mix Type 6. Location 7. Stations Placed C. Mix Design: Submit results of laboratory tests performed on each mix design. Testing shall have been accomplished not more than one-year prior to date of material placement. 217021 B-52 MEMORIAL PARK PH 2 102318 THE MUSEUM OF FLIGHT BUILDING AND PUBLIC WORKS PERMIT ASPHALT PAVING SECTION 32 12 16 - 2 D. Submit reports for testing specified under paragraph entitled "Field Quality Control." 1. Density 2. Thickness 3. Straightedge Test E. Pavement Cores: Submit 2 pavement cores when using the in-place nuclear density method. 1.5 QUALITY ASSURANCE A. Regulatory Requirements: Provide work and materials in accordance with applicable requirements of SS -1. Sections and Paragraphs mentioned herein refer to those specifications. Paragraphs in SS -1 entitled "Measurement and Payment" shall not apply. Where "state" is used it shall mean "Owner." PART 2 PRODUCTS 2.1 ASPHALT CONCRETE A. Provide asphalt concrete in accordance with the applicable requirements of the SS -1, Section 5-04, "Hot Mix Asphalt." 2.2 SUBGRADE/SUBBASE A. As specified in Section 31 00 00, "Earthwork." 2.3 BASE COURSE A. As specified in Section 32 11 23, "Aggregate Base Courses." 2.4 COMPOSITION OF MIXTURE REQUIREMENTS A. Aggregates: Shall confirm to SS -1, Section 9-03.8, "Aggregate for Hot Mix Asphalt, Class 1/2 inch. B. Asphalt Cement: In accordance with SS -1, Section 9-02.1(4), "Performance Graded Asphalt Binder," PG 58-22. PART 3EXECUTION 3.1 PREPARATION A. Excavation and Filling: Excavation and filling to establish elevation of subgrade is specified in Section 31 00 00, "Earthwork." B. Prior to the laying of the asphalt concrete, clean underlying course of foreign or objectionable matter with power blowers or power brooms, supplemented by hand brooms and other cleaning methods where necessary. 217021 B-52 MEMORIAL PARK PH 2 102318 THE MUSEUM OF FLIGHT BUILDING AND PUBLIC WORKS PERMIT ASPHALT PAVING SECTION 32 12 16 - 3 C. Spray contact surfaces of previously constructed pavement with a tack coat. Paint contact surfaces of structures, concrete pavements and walks and utility appurtenances with tack coat prior to placing the asphalt concrete. 3.2 CONSTRUCTION A. Provide construction in accordance with the applicable requirements of the SS -1, except where indicated or specified otherwise. B. Methods of construction of asphalt concrete pavement shall be in accordance with SS -1. Compact asphalt mixture to 92 percent of the maximum attained in a laboratory specimen of the same mixture prepared in accordance with AASHTO T209. Placement will not be permitted unless the Contractor has a working asphalt thermometer on site. 1. The range of temperatures of the mixtures at the time of spreading shall be between 250 degrees Fahrenheit and 300 degrees Fahrenheit. Bituminous concrete having temperatures less than minimum spreading temperature when dumped into the spreader will be rejected. Adjust spreader and regulate speed so that the surface of the course is smooth and continuous without tears and pulling, and of such depth that, when compacted, the surface conforms with the cross section, grade, and contour indicated. Unless otherwise directed, begin the placing along the centerline of areas to be paved on a crowned section or on the high side of areas with a one-way slope. Place mixture in consecutive adjacent strips having a minimum width of 10 feet except where the edge lanes require strips less than 10 feet to complete the area. Construct longitudinal joints and edges to true line markings. Establish lines parallel to the centerline of the area to be paved, and place string lines coinciding with the established lines for the spreading machine to follow. Provide the number and location of the lines needed to accomplish proper grade control. When specified grade and smoothness requirements can be met for initial lane construction by use of an approved long ski -type device of not Tess than 30 feet in length and for subsequent lane construction by use of a short ski or shoe, in-place string lines for grade control may be omitted. Place mixture as nearly continuous as possible and adjust the speed of placing as needed to permit proper rolling. 2. Shovelers and rakers shall follow the spreading machine. Add or remove hot mixture and rake the mixture as required to obtain a course that when completed will conform to requirements specified herein. Broadcasting or fanning of mixture over areas being compacted is prohibited. When segregation occurs in the mixture during placing, suspend spreading operation until the cause is determined and corrected. Correct irregularities in alignment left by the spreader by trimming directly behind the machine. Immediately after trimming, compact edges of the course by tamping laterally with a metal lute or by other approved methods. Distortion of the course during tamping is prohibited. 3. In areas where the use of machine spreading is impractical, spread mixture by hand. The range of temperatures of the mixtures when dumped onto the area to be paved shall be between 250 and 300 degrees Fahrenheit. Mixtures having temperatures less than minimum spreading temperature when dumped onto the area to be paved will be rejected. Spread hot mixture with rakes in a uniformly loose layer of a thickness that, when compacted, will conform to the required grade, thickness, and smoothness. During hand spreading, place each shovelful of mixture by turning the shovel over in a manner that will prevent segregation. Do not place mixture by throwing or broadcasting from a shovel. Do not dump loads any faster than can be properly handled by the shovelers and rakers. 4. Compact mixture by rolling. Begin rolling as soon as placement of mixture will bear rollers. Delays in rolling freshly spread mixture shall not be permitted. Start rolling longitudinally at the extreme sides of the lanes and proceed toward center of pavement, or toward high side of pavement with a one-way slope. Operate rollers so that each trip overlaps the previous adjacent strip by at least one foot. Alternate trips of the roller shall 217021 B-52 MEMORIAL PARK PH 2 102318 THE MUSEUM OF FLIGHT BUILDING AND PUBLIC WORKS PERMIT ASPHALT PAVING SECTION 32 12 16 - 4 be of slightly different lengths. Conduct tests for conformity with the specified crown, grade and smoothness immediately after initial rolling. Before continuing rolling, correct variations by removing or adding materials as necessary. If required, subject course to diagonal rolling with the steel wheeled roller crossing the lines of the previous rolling while mixture is hot and in a compactable condition. Speed of the rollers shall be slow enough to avoid displacement of hot mixture. Correct displacement of mixture immediately by use of rakes and fresh mixture, or remove and replace mixture as directed. Continue rolling until roller marks are eliminated and course has a density as specified in this section. During rolling, moisten wheels of the rollers enough to prevent adhesion of mixture to wheels, but excessive water is prohibited. Operation of rollers shall be by competent and experienced operators. Provide sufficient rollers for each spreading machine in operation on the job and to handle plant output. In places not accessible to the rollers, compact mixture thoroughly with hot hand tampers. Skin patching of an area after compaction is prohibited. Remove mixture that becomes mixed with foreign materials or is defective and replace with fresh mixture compacted to the density specified herein. Roller shall pass over unprotected edge of the course only when laying of course is to be discontinued for such length of time as to permit mixture to become cold. 5. Joints shall present the same texture and smoothness as other portions of the course, except permissible density at the joint may be up to 2 percent less than the specified course density. Carefully make joints between old and new pavement or within new pavements in a manner to ensure a thorough and continuous bond between old and new sections of the course. Vertical contact surfaces of previously constructed sections that are coated with dust, sand, or other objectionable material shall be painted with tack coat just before placing fresh mixture. a. Transverse Joints: Roller shall pass over unprotected end of freshly laid mixture only when laying of course is to be discontinued. Except when an approved bulkhead is used, cut back the edge of previously laid course to expose an even, vertical surface for the full thickness of the course. When required, rake fresh mixture against joints, thoroughly tamp with hot tampers, smooth with hot smoothers, and roll. Transverse joints in adjacent lanes shall be offset a minimum of 2 feet. b. Longitudinal Joints: Space 6 inches apart. Do not allow joints to coincide with joints of existing pavement or previously placed courses. Spreader screed shall overlap previously placed lanes 2 to 3 inches and be of such height to permit compaction to produce a smooth dense joint. With a lute, push back mixture placed on the surface of previous lanes to the joint edge. Do not scatter mix. Remove and waste excess material. When edges of longitudinal joints are irregular, honeycombed, or poorly compacted, cut back unsatisfactory sections of joint and expose an even vertical surface for the full thickness of the course. When required, rake fresh mixture against joint, thoroughly tamp with hot tampers, smooth with hot smoothers, and roll while hot. C. Subgrade/Subbase: Section 31 00 00, "Earthwork." D. Base Course: Section 32 11 23, "Aggregate Base Courses." 3.3 FIELD QUALITY CONTROL A. Sample shall be taken by Contractor as specified herein. Contractor shall replace pavement where sample cores have been removed. B. Core Identification: 1. Place each core in a container and securely seal to prevent loss of material. Tag each sample for identification. Tag shall contain the following information: 217021 B-52 MEMORIAL PARK PH 2 102318 THE MUSEUM OF FLIGHT BUILDING AND PUBLIC WORKS PERMIT ASPHALT PAVING SECTION 32 12 16 - 5 a. Contract No. b. Sample No. c. Quantity d. Date of Sample e. Sample Description f. Source/Location/Stations Placed/depth below the finish grade g. Intended Use h. Thicknesses of various lifts placed C. Testing: 1. Testing of Pavement Course: a. Density: Determine density by testing pavement in accordance with TM -8 the day the pavement is placed. Perform 3 density tests for each 200 tons, or fraction thereof, of pavement placed. b. Thickness: Determine thickness of finished pavement by use of following equation: t = w/(0.75d) where: t = pavement thickness, in inches w = average weight per square yard of mixture actually used in work d = compacted density as measured by nuclear density device c. Straightedge Test: Test compacted pavement of binder course and with a straightedge as work progresses. Apply straightedge parallel with and at right angles to center line after final rolling. Variations in the binder course surface shall not be more than 1/4 inch from the lower edge of the 10 -foot straightedge; variations in wearing course surface shall not be more than 1/4 inch from the lower edge of the 10 -foot straightedge. Pavement showing irregularities greater than that specified shall be corrected as directed by the Engineer. d. Compaction: Test compacted asphalt density in accordance with TM -8. 3.4 PROTECTIION A. Do not permit vehicular traffic, including heavy equipment, on pavement until surface temperature has cooled to at least 120 degrees Fahrenheit. END OF SECTION 217021 B-52 MEMORIAL PARK PH 2 102318 THE MUSEUM OF FLIGHT BUILDING AND PUBLIC WORKS PERMIT SITE CONCRETE FINISHES SECTION 321320 - 1 PART 1 GENERAL 1.1 RELATED DOCUMENTS Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section 1.2 SUMMARY A. This Section includes finishes for exterior cast in place concrete for the following 1. Cast -in-place concrete walkways 2. Cast -in-place concrete site walls B. Related Sections include the following: 1. Division 03 Section Cast -in -Place Concrete for general building applications of concrete 2. Division 03 Section Concrete Formwork for general formwork requirements 3. Division 02 Section "Earth Work" for subgrade preparation, grading, and subbase course. 1.3 SUBMITTALS A. Product Data: For each type of manufactured material and product indicated. B. Material Certificates: Signed by manufacturers certifying that each of the.following materials complies with requirements 1. Isolation Joint filler strip. 1.4 QUALITY ASSURANCE A. Mockups: Cast 24" x 24" mockups of full-size sections of concrete pavement and cast -in- place concrete site walls and plinth to demonstrate typical joints, edges, reveals, surface finish, texture, color, and standard of workmanship to 1. Build mockups in the location and of the size indicated or, if not indicated, as directed by Architect. 2. Notify Architect seven days in advance of dates and times when mockups will be constructed. 3. Obtain Architect's approval of mockups before starting construction. 4. Maintain approved mockups during construction in an undisturbed condition as a standard for judging the completed pavement. 5. Demolish and remove approved mockups from the site when directed by Architect. 6. Approved mockups may become part of the completed Work if undisturbed at time of Substantial Completion. 7. Concrete Pavement a. Full size section of concrete pavement to demonstrate typical joints, surface finish, texture and standard of workmanship. b. Provide (2) 24" x 24" mock-up samples for each type of concrete pavement finish for review and approval. c. Broom Finish Concrete Pavement: i. Provide 2 Mock-up samples for broom finish concrete for review and approval. Provide 1 light broom and 1 medium broom finish mock-up. 217021 B-52 MEMORIAL PARK PH2 10-23-18 MUSEUM OF FLIGHT PERMIT SUBMITTAL SITE CONCRETE FINISHES SECTION 321320 - 2 ii. Architect will select finish for broom finish site concrete from these mock-up panels as an approved sample for remaining broom finish concrete on site. d. Sandblast Finish Concrete Pavement: i. Provide 3 Mock-up samples for sandblast finish concrete for review and approval. Provide 1 light sandblast, 1 medium sandblast and 1 heavy sandblast finish mock-up. ii. Architect will select finish for sandblast finish concrete pavement from these mock-up panels as an approved sample for remaining sandblast finish concrete on site. e. Integral Color: Davis Color "Light Gray 8084," where indicated on Drawings. f. Sandblast Vertical Concrete (walls, etc.): i. Provide 2 Mock-up samples for sandblast finish concrete for review and approval. Provide 1 light and 1 medium finish. ii. Architect will select finish for sandblast finish site concrete from these mock-up panels as an approved sample for remaining sandblast finish concrete on site. B. Preinstallation Conference: Conduct conference at Project site to comply with requirements in Division 01 Section "Project Management and Coordination." 1. Before submitting design mixtures, review concrete pavement mixture design and examine procedures for ensuring quality of concrete materials and concrete pavement construction practices. Require representatives, including the following, of each entity directly concerned with concrete pavement, to attend conference: a. Contractor's superintendent. b. Independent testing agency responsible for concrete design mixtures. c. Ready -mix concrete producer. d. Concrete pavement subcontractor. PART 2 PRODUCTS 2.1 FORM -FACING MATERIALS A. Rough -Formed Finished Concrete: Plywood, lumber, metal, or another approved material. Provide lumber dressed on at least two edges and one side for tight fit. B. "Architectural" Concrete: 1. Form facing panels for board -formed, as -cast finishes; utility grade 1 "x6" boards, mill applied release agent. C. Rustication Strips: Wood, metal, PVC, or rubber strips, kerfed for ease of form removal. D. Form Release Agent: Commercial formulation, silicone -free form -release agent, to suit conditions of application which will not bond with, stain, or leave film residue, or adversely affect concrete surfaces, and which will not impair subsequent treatment of concrete surfaces requiring bond or adhesion nor impede wetting of surfaces which will be cured with water, steam, or curing compounds. 1. Before each pour, coat forms (including HDO plywood forms) with Nox-Crete "Crete -Lease VOC-880," L&M "Debond Form Coating," W.R. Meadows Sealtight "Duogard II," or accepted, to suit type of form material. 217021 B-52 MEMORIAL PARK PH2 10-23-18 MUSEUM OF FLIGHT PERMIT SUBMITTAL SITE CONCRETE FINISHES SECTION 321320 - 3 2. Agent used shall be compatible with finish scheduled to be placed on surface. 3. Confirm that form coatings are compatible with water repellent specified in Sections 071910, Water Repellent Coatings on Vertical Surfaces 2.2 MATERIALS A. Comply with "Quality Assurance" provisions, Specifications, and Manufacturer's Data. Where these may be in conflict, the more stringent requirements govern. B. Provide materials required to produce selected finish and scoring. C. Provide all equipment, tools, methods, and accessory items required. D. Provide necessary protective safety devices 2.3 RELATED MATERIALS A. Isolation -Joint -Filler Strips: ASTM D 1751, asphalt -saturated cellulosic fiber. Provide in locations as indicated per Drawings. Hold down W below finish grade of concrete. PART 3 EXECUTION 3.1 BROOM FINISHING A. Broom finish direction to be perpendicular to major route of pedestrian travel or as indicated on Drawings. B. Medium -to -Fine Textured Broom Finish: Draw a soft bristle broom across float finished concrete surface perpendicular to line of traffic to provide a uniform, fine -line texture C. Medium -to -Course Textured Broom Finish: Provide a coarse finish by striating float finished concrete surface 1/8 inch deep with a stiff -bristled broom, perpendicular to line of traffic. 3.2 SANDBLASTING A. Sandblast Finish: Walls 1. Apply sandblast finish in locations indicated on the Drawings. 2. Materials required to produce selected finish: a. Cement, Water, Admixtures: Specified in Section 033000. b. Blasting nozzle, compressor, lines, hoses, and blasting compounds to match finish samples. Size of blasting sand to be determined by reviewed mock-up. c. Provide all equipment, tools, methods, and accessory items required. d. Provide necessary protective safety devices. 3.3 JOINTS Control Joints: Form weakened -plane contraction joints, sectioning concrete into areas as indicated. Construction contraction joints for a depth equal to at least one-fourth of the concrete thickness, as follows: 217021 B-52 MEMORIAL PARK PH2 10-23-18 MUSEUM OF FLIGHT PERMIT SUBMITTAL SITE CONCRETE FINISHES SECTION 321320 - 4 1. Sawed Joints: Form contraction joints with power saws equipped with shatterproof abrasive or diamond -rimmed blades. Cut 1/8 -inch and 3/8 -inch wide joints into concrete when cutting action will not tear, abrade, or otherwise damage surface and before developing random contraction cracks. B. Expansion Joints: Place expansion (isolation) joints where paving meets vertical surfaces as described in detail 1/L3.10 1. Hold top of expansion joint 1/2 -inch below finished surface. 2. Apply no joint sealant or caulk in joints. C. Construction Joints: Form construction joints between two adjacent pours. Individual pours shall be bound by control joint locations as shown in plans. 1. Provide 12 -inch #4 tie bars every 24 -inches on center. Grease one end. 2. Finished surface (corners) of construction joints to match adjacent control joints 3.4 PROTECTION A. Facility will be occupied. Contractor is responsible for protection of concrete and will repair or replace as required by Owner. END OF SECTION 217021 B-52 MEMORIAL PARK PH2 10-23-18 MUSEUM OF FLIGHT PERMIT SUBMITTAL PAVEMENT MARKINGS SECTION 32 17 23 - 1 PART1 GENERAL 1.1 SUMMARY A. Section includes requirements for furnishing and installing pavement markings for parking. 1.2 REFERENCES A. The latest versions (unless noted otherwise) of the publications listed below form a part of this specification to the extent referenced. The publications are referred to in the text by the basic designation only. B. Washington State Department of Transportation (WSDOT): 1. SS -1 (2018) Standard Specifications for Road, Bridge, and Municipal Construction. 1.3 SUBMITTALS A. Submit the following in accordance with Section 01 33 00, "Submittal Procedures." 1. Manufacturer's catalog data for paints. 2. Material Safety Data Sheets. 1.4 DELIVERY AND STORAGE A. Deliver paints and paint materials in original sealed containers that plainly show the designated name, specification number, batch number, color, date of manufacture, manufacturer's directions, and name of manufacturer. Provide storage facilities at the job site for maintaining materials at temperatures recommended by the manufacturer. 1.5 WEATHER LIMITATIONS A. Apply paint to clean, dry surfaces, and unless otherwise approved, only when air and pavement temperature is at least 5 degrees above the dew point and the air and pavement temperatures are above 50 degrees F and less than 110 degrees F for water-based materials. Maintain paint temperature within these same limits. 1.6 EQUIPMENT A. Machines, tools, and equipment used in the performance of the work shall be maintained in Satisfactory operating condition. 1. Paint Applicator: Provide hand -operated push -type applicator machine of a type commonly used for application of paint to pavement surfaces. Paint applicator machine shall be acceptable for marking small street and parking areas. Applicator machine shall be equipped with the necessary paint tanks and spraying nozzles, and shall be capable of applying paint uniformly at coverage specified. 217021 6-52 MEMORIAL PARK PH 2 102318 THE MUSEUM OF FLIGHT BUILDING AND PUBLIC WORKS PERMIT PAVEMENT MARKINGS SECTION 32 17 23 - 2 PART2 PRODUCTS 2.1 MATERIALS A. Paints for pavements: SS -1, Section 9-34.2(3) Low VOC Waterborne Paint. Color as indicated on the drawings. B. Precast Concrete Wheelstops: As manufactured by Oldcastle Precast or approved equal. PART 3 EXECUTION 3.1 SURFACE PREPARATION A. Allow new pavement surfaces to cure for a period of not Tess than 14 days before application of marking materials. Thoroughly clean surfaces to be marked before application of the paint. Remove dust, dirt, and other granular surface deposits by sweeping, blowing with compressed air, rinsing with water, or a combination of these methods as required. Remove residual curing compounds and other coatings adhering to the pavement by waterblasting. Scrub affected areas where oil or grease is present on old pavements to be marked with several applications of trisodium phosphate solution or other approved detergent or degreaser and rinse thoroughly after each application. After cleaning oil -soaked areas, seal with shellac or primer recommended by the manufacturer to prevent bleeding through the new paint. Do not commence painting in any area until pavement surfaces are dry and clean. 3.2 APPLICATION A. Rate of Application: Apply paint evenly to the pavement surface to be coated at a rate of 105 plus or minus 5 square feet per gallon. B. Painting: Apply paint pneumatically with approved equipment at rate of coverage specified herein. Provide guidelines and templates as necessary to control paint application. Take special precautions in marking numbers, letters, and symbols. Manually paint numbers, letters, and symbols. Sharply outline all edges of markings. The maximum drying time requirements of the paint specifications will be strictly enforced, to prevent undue softening of bitumen and pickup, displacement, or discoloration by tires of traffic. Discontinue painting operations if there is a deficiency in drying of the markings until cause of the slow drying is determined and corrected. C. Precast Concrete Wheelstops: Install as indicated on the drawings. 3.3 TRAFFIC CONTROL AND PROTECTION A. Place warning signs near the beginning of the work site and well ahead of the work site for alerting approaching traffic from both directions. Place small markers along newly painted lines to control traffic and prevent damage to newly painted surfaces. Mark painting equipment with large warning signs indicating slow-moving painting equipment in operation. END OF SECTION 217021 B-52 MEMORIAL PARK PH 2 102318 THE MUSEUM OF FLIGHT BUILDING AND PUBLIC WORKS PERMIT IRRIGATION SECTION 328400 - 1 PART 1 - GENERAL 1.1 RELATED DOCUMENTS A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section. 1.2 SUMMARY A. Section Includes: 1. Furnish all labor, materials, supplies, equipment, tools, and transportation, and perform all operations in connection with and reasonably incidental to the complete installation of a permanent, underground, automatically controlled irrigation system. 2. In -grade irrigation system will be used in all planting areas. B. Related sections include the following: 1. Division 32 Section "Hydroseeding" for exterior plants and seeding. 2. Division 32 Section "Planting Soil" for planting soils. 1.3 QUALITY ASSURANCE A. Qualifications: The contractor for this work shall be a firm specializing in irrigation work with a minimum 10 years of continuous engagement in landscape irrigation and a minimum of five projects that are similar in scale and complexity. 1.4 SUBMITTALS A. Submit complete materials list prior to performing any work. Submit manufacturer catalog data and full descriptive literature, including current manufacturer's price list. B. Equipment or materials installed or furnished without prior approval of the Architect will be rejected and such materials will be required to be removed and replaced with approved materials at the complete expense of the Contractor. C. Qualifications: Submit statement and outline of landscape subcontractors' qualifications per 1.4 Quality Assurance. D. Record Drawings: Submit 2 copies of As -Built Drawings, for review by Architect. Revise and resubmit 2 copies, after making additions and/or changes requested by Architect for Record Drawings. E. 0 & M Manual: Submit one copy of the 0 & M Manual, including the materials described below, for review by Architect: 1. 0 & M Manual shall be contained within a hard -bound black 3 ring binder, with project title and date appearing on side and front cover. Inside page shall include project name, date, contractor's name, address, phone number and other contact information. 217021 B-52 MEMORIAL PARK PH2 10-23-18 MUSEUM OF FLIGHT PERMIT SUBMITTAL IRRIGATION SECTION 328400 - 2 2. Include cut sheets for all specified products, including exploded versions of valves, with parts clearly labeled. 3. Provide a list of product suppliers, with phone numbers and addresses. 4. Provide detailed recommendations for annual spring start up and fall winterization process. 5. Provide one full size copy of the approved Record Drawings, and warranty information for irrigation. 1.5 PROJECT CONDITIONS: A. Underground utilities and elements: Locate all underground utilities and elements prior to digging and/or driving stakes. Take care, to neither disturb nor damage any existing above ground or underground utilities or elements. Keep streets, sidewalks and site clean, free from debris and affected drains open and free flowing at all times. Engage the services of a private utilities locating service for location of utilities within the site. Contact the Owner for "as -built" information for on-site irrigation and water system information. B. Site inspection and layout: Before proceeding with any work, the Contractor shall inspect the site, carefully check all grades and verify all dimensions and conditions affecting the work to satisfy him/her that he/she may safely proceed. Changes or alterations to the system to meet actual conditions shall be made at the Contractor's expense. Irrigation plan is diagrammatic and is not intended to show exact locations of existing or proposed piping or valves. Locate new items as closely as possible to related curbs, walls, fences or edges of paving. Pipelines shown parallel on drawing may be placed in a common trench but separated by at least 6 inches. 1.6 GUARANTEE A. Contractor shall provide one year written guarantee as per Paragraph 3.9 of this section. B. Guarantee shall include restoration of planted or paved areas due to settlement of trenches. C. Guarantee shall include one complete winterization and one complete de -winterization of the irrigation system. 1.7 EXTRA MATERIALS A. Furnish extra materials that match products installed that are packaged with protective covering for storage and identified with labels describing content. Supply (3) of the following: 1. Rotary Nozzles: Supply (3) of each type specified 217021 B-52 MEMORIAL PARK PH2 10-23-18 MUSEUM OF FLIGHT PERMIT SUBMITTAL IRRIGATION SECTION 328400 - 3 PART 2 - PRODUCTS 2.1 PLASTIC PIPE: A. PVC pipe (mainline) shall be Class 200 or better and shall conform to all requirements of ASTM D1785-86. B. All PVC pipe shall be marked with the manufacturer's name, class of pipe and NSF seal. Pipe shall bear no evidence of interior or exterior extrusion marks. Pipe walls shall be uniform, smooth and glossy. Pipe may be pre -belled or with individual solvent -weld couplings. C. All PVC fittings shall be of the solvent weld type except Where risers, valves, etc., require threaded transition fittings. All fittings shall conform to the requirements of ASTM D2466-78. All threaded PVC fittings and nipples shall be Schedule 40 or 80 (refer to details). D. All PVC pipe must be delivered in at least twenty foot (20') lengths. E. All PVC pipes and fittings for swing joints shall conform to all requirements of ASTM D3139. F. Sleeves required for main lines located under paving shall be Schedule 40 PVC, with the inside diameter (I.D.) of sleeve to be twice the outside diameter (O.D.) of the insert pipe, maximum 1 insert pipe per sleeve. G. Use Teflon tape on all threaded fittings. H. Primer color shall be purple and glue color shall be grey. 2.2 SLEEVES A. Sleeves required for lateral lines located under paving where vehicles are anticipated shall be Schedule 40 PVC or better. The inside diameter (I.D.) of sleeve to be twice the outside diameter (O.D.) of the insert pipe, maximum 1 insert pipe per sleeve. All wiring shall be in its own separate Schedule 40 PVC sleeve, independent from the piping sleeves. 2.3 MASTER CONTROL VALVES: A. As Shown on Drawings 2.4 FLOW SENSORS A. As Shown on Drawings 2.5 QUICK COUPLING VALVES: A. As Shown on Drawings 217021 B-52 MEMORIAL PARK PH2 10-23-18 MUSEUM OF FLIGHT PERMIT SUBMITTAL IRRIGATION SECTION 328400 - 4 B. Provide five (5) operating keys and hose swivels. 2.6 MANUAL CONTROL VALVES A. As Shown on Drawings 2.7 AUTOMATIC VALVES A. As Shown on Drawings B. Valves shall be electrically operated, actuated by a solenoid utilizing AC current, 24 volts, and rated at not more than 8.5 VA with an in -rush maximum of 1.0 amp. The solenoid coil is to be sealed in an "Epoxy" materials so it is completely waterproof. C. Operation shall be normally closed solenoid control capable of operating within minimum flow requirements. D. Diaphragm operated of one-piece construction. The diaphragm is to be fully pressure balanced in both the open and closed positions. E. Solenoid to be mounted directly on the valve or bonnet. All parts and tubing downstream of the entrance must be of larger size to permit passage of foreign particles. F. A flow adjustment stem with cross handle shall be provided that limits the travel of the valve plug from full closed to full open, allowing manual closure or flow regulation. A manual control is to be provided for operation with or without the control wiring installed. G. Construction is to be so that all operating parts are accessible and removable from the top by removing the bonnet without having to disconnect the valve body from the pipeline. The valve must be capable of being operated in any position. 2.8 VALVE BOXES A. Individual gate valves and quick coupler valves shall be enclosed in a 10" round valve box of polyolefin and fibrous material with a latch lock and cover. Box and lid to be green. B. Provide two (2) sets of all keys required for valves, valve box covers, and protective sleeve covers unless otherwise noted. C. Valve boxes shall be as below or approved equal. 1. Ametek or Carson 10 inch diameter round box (for quick couplers and gate valves), green color. 2. Ametek or Carson Rectangular Standard Valve box (for automatic control valves), color green 217021 B-52 MEMORIAL PARK PH2 10-23-18 MUSEUM OF FLIGHT PERMIT SUBMITTAL IRRIGATION SECTION 328400 - 5 2.9 CONTROL WIRE FOR AUTOMATIC VALVES A. Control wire shall be insulated single strand copper designed for twenty (20) to fifty (50) volts and UL approved as Type U.F. (Underground Feeder). The UL and U.F. designations shall be clearly marked or indented on the insulation jacket of the wire. B. Flow sensor control wire: Houston Wire D1501802 (direct bury, shielded, 2-18 gauge copper wires, drain wire) or approved. C. Expansion curls shall be provided within three (3) feet of each wire connection to solenoid and at least every three hundred (300) feet in length of control wire length. Expansion curls are formed by wrapping at least 5 turns of control wire around a rod or pipe 1" or more in diameter. Withdraw the rod or pipe once curls are formed. D. Copper conductors must meet or exceed ASTM B-3 requirements. E. White, black and orange color wires shall be used. F. One spare wire (orange) for each 4 zones is required unless otherwise shown on the Drawings. 2.10 AUTOMATIC IRRIGATION CONTROLLER A. As Shown on Drawings 2.11 SPRINKLERS A. All heads shall have a built-in pressure -regulating device. The device shall regulate nozzle pressure to the design pressure. The pressure -regulating device shall Ibe an internal part of the pop-up stem. B. The heads shall have matched precipitation rate nozzles with adjusting screws. C. All heads shall have screens under the nozzles. D. When noted on schedule, the heads shall be equipped with check valves to prevent low head drainage. E. Sprayheads shall be per drawings or approved equal. 2.12 RISERS AND SWING JOINTS A. Quick coupler swing joints must be constructed according to the Details. B. All threaded joints are to have Teflon tape or pipe dope applied to male threads only. C. Quick couplers shall have swing joints that allow the head to be set perpendicular and flush with finish grades. 217021 B-52 MEMORIAL PARK PH2 10-23-18 MUSEUM OF FLIGHT PERMIT SUBMITTAL IRRIGATION SECTION 328400 - 6 2.13 OTHER SUPPLIES A. Electrical tape shall be black plastic, three-quarters inch (3/4") wide and a minimum of 0.007 inches thick and the all-weather type. B. Teflon tape shall be used for all threaded connections. Tape shall be set back a minimum of one quarter inch (1/4") into the pipe threading. 2.14 IDENTIFICATION A. Underground - Type Plastic Line Markers: Permanent, bright -colored, continuous -printed plasticized aluminum tape, intended for direct -burial service; not less than 3" wide x 5 mils thick. Provide blue tape with black printing reading "CAUTION IRRIGATION LINE BURIED BELOW". Line Tec. Inc., PO Box 67, Glen Ellyn, IL 60138. Detectable Marking Tape; Allen Systems, P.O. Box 33569, Houston, TX 77233 (713)943-7213, (800) 231-2077; or Magnatec by Thor Enterprises, Inc. P.O. Box 450, Sun Prairie, WI 53590. B. Christy's identification tags manufactured from polyurethane Behr Desopan, incorporating an integral attachment neck and reinforced attachment hole and will be capable of withstanding 180 pounds pull force. Tag shall be 2 1/4" x 2 3/4" in size. All lettering shall be hot stamped in black and capable of withstanding outdoor use. Tag color shall be yellow. Marking tag shall be double side stamp with zone valve number. 2.15 BACKFILL MATERIAL A. Sand for backfill around all irrigation heads use: common builder's sand. B. Suitable bedding material for use around all pipes and equipment as shown on the Details, use: native topsoil with no rocks or other debris more than 1 inch diameter or common builder's sand. PART 3 - EXECUTION 3.1 GENERAL A. Pre -installation Conference: Prior to installation of any irrigation equipment, (not including sleeving), contractor to arrange an on-site pre -installation conference to include, at a minimum, the landscape architect, landscape contractor foreman, general contractor field representative. The intent of the meeting is to review the proposed irrigation system design, installation procedures, schedule, and other related work 3.2 INSPECTIONS AND REVIEWS A. Site Inspections: 1. Verify site conditions, including meeting with facilities staff. Note irregularities affecting work of this section. Report irregularities to the Architect prior to beginning work. 217021 B-52 MEMORIAL PARK PH2 10-23-18 MUSEUM OF FLIGHT PERMIT SUBMITTAL IRRIGATION SECTION 328400 - 7 2. Beginning work of this section implies acceptance of existing conditions. B. Irrigation System Layout Review: 1. Irrigation system layout review will occur after the layout has been completed. Notify the Architect five (5) working days in advance of review. 2. Verify locations of underground utilities 3.3 LAYOUT OF WORK A. Before starting work, determine that work may proceed without disruption of activities of other trades. B. The Contractor shall carefully check grades to ensure that area is ready to begin work. C. Contractor is responsible for taking all reasonable investigative actions and precautions when working around all utility systems 3.4 TRENCHING A. Exercise care when excavating trenches near existing trees. Where roots are two inches (2") and greater in diameter hand excavate and tunnel. When Targe roots are exposed, wrap with heavy burlap for protection and prevent excessive drying. Trenches dug by machines adjacent to trees having roots two inches (2") and less in diameter shall have the sides hand trimmed making a clean cut of the roots. Trenches having exposed tree roots shall be back-filled within twenty-four (24) hours unless adequately protected with moist burlap or canvas. B. The planting soil shall be kept separate from subsoil and shall be replaced as the top layer when backfill is made. C. Trenches shall allow for 12 inches of soil cover over sprinkler lateral lines and 18 inches of soil cover for irrigation main lines. Maintain a minimum clearance of 3- inches between irrigation lines within a common trench. Stacking of pipes in a common trench will not be accepted. Trenches for sleeves shall allow for a minimum of 18 inches of cover unless existing or proposed utilities require changes and as approved by Architect. Excavate no wider at any point than is necessary to lay pipe or install equipment. Excavate with vertical sides and provide bracing and shoring as required. D. Materials unsuitable for bedding of pipe to be removed to a depth 4" below trench bottom, and replaced with suitable bedding material. Suitable bedding material shall be: excavated trench material, free from rocks, roots, sticks, debris or other sharp objects over one inch in diameter; or sand, as required. E. All trenches must be straight, with appropriate pipe -fittings used to allow pipe to be laid without undue bending and not have abrupt changes in grade. F. The trench bottom must be free of rocks or sharp -edged objects. 217021 B-52 MEMORIAL PARK PH2 10-23-18 MUSEUM OF FLIGHT PERMIT SUBMITTAL IRRIGATION SECTION 328400 - 8 G. The use of an underground vibratory plow or similar device to pull pipe will not be permitted. 3.5 INSTALLATION A. PVC Pipe and Fittings: 1. The Contractor shall exercise care in handling, loading, unloading and storing to avoid damage. The pipe and fittings shall be stored under cover, and shall be transported in a vehicle with a bed long enough to allow the length of pipe to lay flat, so as not to be subject to undue bending or concentrated external load at any point. Any pipe that has been dented or damaged shall be discarded until such damage has been cut out and the pipe is rejoined with a coupling. 2. PVC pipe ends shall be cut to ninety (90) degrees to the pipe length and cleaned of all cutting burrs prior to cementing. Use approved reaming tool. Pipe ends shall be wiped clean with a rag and lightly wetted with PVC primer. Cement shall be applied with a Tight coat on the inside of the fitting and heavier coat on the outside of the pipe. Pipe shall be inserted into the fitting and given a quarter turn to seat the cement. Excess cement shall be wiped from the outside of the pipe. Pipe will be tested as indicated elsewhere in these specifications. No back filling will be permitted other than at the centers of pipe lengths until the pressure test is completed. 3. Appropriate primer shall be used with solvent glue. Solvent welded joints shall be given at least fifteen (15) minutes set-up time before moving or handling. Pipe shall be partially center loaded to prevent arching and slipping. No water shall be permitted in pipe until a period of at least ten (10) hours has elapsed for solvent weld setting and curing. 4. Before pressure testing, soluble weld joints shall be given at least twenty-four (24) hours curing time. 5. No PVC pipe may be threaded or connected to a threaded fitting without an adapter. Use Teflon tape on all male threads. 6. Great care must be taken to insure that the inside of the pipe is absolutely clean. Any pipe ends not being worked on must be protected and not left open. B. Control Wiring: 1. Control wires are to be taped together at five (5) foot intervals with electrical tape; then this bundle is to be taped to the bottom of the supply line at ten foot (10') intervals with at least three (3) wraps of electrical tape. A bare copper wire #14 or greater, will be installed on top of the PVC supply line for future detection with the wire ends clearly exposed in the valve boxes. 2. Tie a loose 24 inches long loop in all wiring at changes of direction greater than 30 degrees. Untie all loops after all connections have been made. 3. Splices will be permitted only at junction boxes, valve boxes, or at control equipment and never between valves or valve and controller. A minimum of 24 inches of excess conductor shall be left at all splices, terminal and control valves to facilitate inspection and future splicing. All splices must be encapsulated with sealant in approved splice kit. 4. One unconnected spare orange control wire (one spare wire for each 5 valves) is to be run from the controller through each intermediate control valve box. Provide a twenty-four inch (24") long, tight loop in each box. Where control valves run in opposite directions from the controller, run a separate spare wire in each direction. 5. A schedule diagram shall be posted in the controller to facilitate the selection of the valves to be operated. 217021 B-52 MEMORIAL PARK PH2 10-23-18 MUSEUM OF FLIGHT PERMIT SUBMITTAL IRRIGATION SECTION 328400 - 9 6. Location and type of monitoring of controllers shall be directed by the Owner or as shown on the Plans. 7. Minimum size of wire is to be determined strictly by the following chart: No. of Maximum Length of Common Wire Valves 500' 1000' 2000' 3000' 1 14 14 14 14 2 14 14 14 10 3 14 14 10 8 4 14 14 10 8 5 14 10 8 6 6 14 10 6 6 7 14 8 6 4 8 14 8 6 4 9 14 8 4 4 10 10 6 4 2 11 10 6 4 - 8. The control wires shall be color coded as follows: a. Neutral or common wire - White. b. Lead-in wire - Black. c. Extra wire — Orange 9. Control wires to be installed in 1 1/2 inch minimum PVC schedule 40 sleeve under all paved areas. C. Sleeves: 1. Trenches located under areas of existing or new paving shall have sleeves installed. Sleeves shall extend 12" beyond the pavement on each side. Trenches shall be back-filled with sand (6 inches above and 4 inches below the pipe) and compacted in layers to 95% compaction, using manual or mechanical tamping devices. Trenches for piping shall be compacted to equal the compaction of the existing adjacent undisturbed soil and shall be left in firm unyielding condition. All trenches shall be left flush with the adjoining grade. The Contractor shall set in place; cap and pressure test aII piping under paving prior to paving work. D. Risers and Swing Joints: 1. All pop-up sprinkler heads and quick coupler swing joints must be constructed according to the Details. 2. Minimum riser size shall be the pipe size of the sprinkler head. 3. All threaded joints are to have Teflon tape or pipe dope applied to male threads only. 4. Risers are to be capped after installation in preparation for pressure testing. 5. All pop-up sprinkler heads and quick couplers shall have swing joints that allow the head to be set perpendicular and flush with finish grades. E. Pop-up Sprinkler Heads: 1. Install heads as designated on the Plans and Details. 2. Spacing of heads shall not exceed spacing shown on the Plans for any reason. 3. Heads along curbs, walks, paving, etc. shall be placed 1/2 inch above finish grade and no closer than 4 inches from paving edge. 4. All heads shall be set perpendicular to finish grade unless otherwise designated on the plans. 5. Backfill around heads with sand per the Details. 217021 B-52 MEMORIAL PARK PH2 10-23-18 MUSEUM OF FLIGHT PERMIT SUBMITTAL IRRIGATION SECTION 328400 - 10 F. Flow Sensor: 1. Installed at point of connection by mechanical contractor per manufacturer's specifications. 2. For PVC flow sensors, install with 10 pipe diameters of straight pipe with no fittings upstream of flow sensor, and 5 pipe diameters of straight pipe with no fittings downstream of flow sensor. 3. Coordinate wiring with control equipment. G. Gate Valves 1. Gate valves in landscape: Enclose all gate valves and ball valves in the landscape via an 8 inch Schedule 40 PVC riser, notched to straddle piping, squarely mount on at least two masonry unit supports placed on a compacted crushed rock base over a compacted subgrade, with 1 to 2 inches of clearance between the frame, piping, valves, and masonry supports, ensurung PVC frame is centered over valve with notched openings sealed externally with firmly permanently affixed filter fabric as to inhibit soil intrusion over the long term, with the PVC frame cut to a length to accommodate a Carson 910 enclosure on top. H. Automatic Valves 1. Before installation of automatic valves, the supply line must be thoroughly flushed. 2. Automatic valves shall be enclosed in valve boxes. Valve box extension may be required. Locate valve boxes in shrub and groundcover planting beds as reviewed by Architect. 3. Locate outside of paved areas and grouped together where possible. Where valves occur adjacent to paved areas, install so that valve boxes will not be closer than 36 inches to paving and perpendicular or parallel to it. Group boxes shall be spaced evenly to provide a neat appearance. 4. Valves and valve boxes shall not be placed over the mainline. 5. Valve boxes shall be set on bricks at corners and sides if applicable; not at the ends. 6. There shall be a maximum of 8 inches between the valve and the valve box lid. 7. Valve boxes shall have at two -inches clearance between top of cutouts and piping. 8. Valve box cutouts shall be "sealed", with drain cloth on outside of valve box to inhibit soil from filling the valve box. 9. Ensure automatic valve is fully accessible for manual operation, adjusting dismantling and servicing. 10. Provide 3" depth, clean, washed pea gravel in base of valve boxes I. Automatic controller: 1. Install electrical wiring according to local code. Include the cost of electrical work required to make the automatic equipment operate properly in this contract. Electrical power and conduit are provided under Division 26. 2. Landscape Architect shall approve controller location and type of mounting of controller. 3. Reduce a copy of the reproducible Mylar as -built to 50%, cut into 8.5" x 11" sections, color key circuits, and laminate both sides with 5 -mil or heavier plastic to make 217021 B-52 MEMORIAL PARK PH2 10-23-18 MUSEUM OF FLIGHT PERMIT SUBMITTAL IRRIGATION SECTION 328400 - 11 waterproof. Also laminate accordingly a system zone control directory listing zone number, head type, number of heads per zone, and a zone description using compass directions, references to surrounding landmarks, and/or significant plat types and species. J. Quick Couplers: 1. All quick coupling valves shall be installed in a 10" diameter valve box as shown in the Details. K. Backfilling: 1. Back -filling shall be done when pipe is not in an expanded condition due to heat or pressure. Cooling of the pipe can be accomplished by operating the system for a short time before back -fill, or by back -filling in the early part of the morning before the heat of the day. 2. In refilling the trenches, the fill around, 4 inches below, and 6 inches above the pipe and fittings shall be suitable bedding material or sand, as required, and tamped. The remainder of the backfill shall contain no lumps or rocks larger than three inches. A six inch separation is required between all pipes when more than one pipe occupies the trench. If no sodding is required, the top 6 inch of backfill shall be replaced by topsoil where it exists (free of rocks over one inch, subsoil or trash) or selected fill soil or sand if soil conditions are rocky. 3. All roots, rocks and surplus excavation shall be removed from the site unless otherwise directed. Any turf areas buried under ditch excavation shall be raked clean of any excavated material. 4. Trenches under roads or paved areas shall be back-filled and tamped with a mechanical tamper in successive six inch (6") lifts. Paving shall be replaced to the satisfaction of the Architect. 5. Prior to completing backfill, place detection tape 12 inches above installed supply mains for future line detection. Provide extra length to clearly expose ends in the valve boxes. 6. Before complete back -filling, all underground appurtenances including, valves, drain valves, and joints must remain exposed so that they can be viewed during testing and located "as -built" by the Owner. It is suggested that the Contractor partially backfill the pipe as it is laid, leaving all joints exposed; then complete back -filling later after flushing, pressure testing, inspection and "record drawing" ;ovation. The location, inspecting and testing provisions of these specifications will be strictly adhered to. If, for any reason, any part of the system is back-filled before approved location, testing, or inspection is authorized, it must be completely uncovered and exposed until approved for back -filling by the Architect 3.6 CLEAN-UP A. Upon completion of operations and prior to watering, clean all adjoining areas such as paving, curbs, and lawns of debris caused by the work on this project, or any part of this project. All hard surfaced areas shall be washed clean. Daily clean up shall be required on all areas used for circulation, parking, or other daily use. 3.7 TESTING AND INSPECTIONS A. Pressure Testing: 217021 B-52 MEMORIAL PARK PH2 10-23-18 MUSEUM OF FLIGHT PERMIT SUBMITTAL IRRIGATVON SECTION 328400 - 12 1. Make hydrostatic tests only in the presence of the Owner and Architect. No pipe shall be backfilled until it has been inspected, tested and approved. 2. Furnish necessary pump, gauges and all other test equipment. 3. All PVC main lines with valves installed and closed shall be flushed and pressure tested with all joints exposed to one hundred fifty (150) psi until watertight. Maximum psi Toss in a thirty (30) minute test period shall be five (5) PSI. 4. To be valid, all tests must be witnessed and approved by the Owner. The contractor must give the Owner forty eight (48) hours notice prior to the anticipated date of inspection. 5. All gauges used in the testing of water pressures shall be certified correct by an independent testing laboratory immediately prior to use on the project. Gauges shall be re -tested when directed by the Owner. 6. All testing shall be approved prior to installation of valves. B. Coverage Test: 1. Before the irrigation system will be accepted, the Contractor, in the presence of the Architect, shall perform a water coverage test for each zone of the system. Contractor to be responsible to change nozzles, etc. at discretion of Architect in order to obtain full coverage with minimum over spray. Contractor will be required to adjust and/or replace nozzles, etc. to meet this requirement. Prior to arrival of Architect, the Contractor shall accomplish the following: complete all work including balancing, adjusting the system (pressure reducing valves, flow adjustment keys, nozzles, etc.) to provide optimum coverage without fogging. 2. Notify the Architect at least 5 -days in advance of coverage test. C. Complete System Inspection (Punch List): 1. Upon approved completion of trenching and installation of all equipment, the Contractor shall request a Complete System Inspection of the entire irrigation system including: backfilling, valves, valve boxes and all other equipment. 2. From this inspection, a punch list shall be prepared by the Architect and presented to the Contractor for completion. The Architect shall give a date for completion of the punch list, not to exceed two weeks. 3. Notify the Architect at least forty-eight (48) hours in advance of Complete System Inspection. D. Substantial Completion: 1. Contractor shall write a letter to the Owner requesting substantial completion of the irrigation system. 2. Refer to General Conditions of these specifications for information about how the irrigation system shall be determined to be substantially complete. E. System Operations Orientation: 1. System Operation Training Session: a. Prior to the training and orientation session. The date and time of the session shall be subject to approval of the Owner. b. The As Built plans shall be reviewed and all features explained. The As Built plans shall consist of red -lined corrections, notes, comments, etc. on a clean print. All critical dimensions shall be shown to the nearest inch. The Architect shall review and approve the As Built plan submitted and prepare Record Drawings on Mylar for archive storage. c. A complete maintenance and operations manual will be prepared by the Contractor and three copies turned over to the Owner at the final inspection. The manuals shall consist of three ring binders containing: (1) catalogs of all materials 217021 B-52 MEMORIAL PARK PH2 10-23-18 MUSEUM OF FLIGHT PERMIT SUBMITTAL IRRIGATION SECTION 328400 - 13 used, (2) a complete parts list of all materials, (3) a written summary of all operations data including spring start-up and winterization techniques, controller programming, valve cleaning, irrigation adjustments and any other information required to operate and maintain system, (4) two local distributors. 2. The contractor shall provide the Owner the necessary keys and/or other tools necessary to operate/drain/activate the system and spend sufficient time with the Owner to insure that the system operation/maintenance/winterizing can continue after departure of the Contractor. The Contractor will be liable for all damages or losses resulting from failure to comply with the provisions of this paragraph. F. Controller Charts: a. As Built drawings shall be approved by the Architect before charts are prepared. The chart shall be a reduction of the actual As Built Drawing prepared by the Architect. b. Provide one controller chart per controller. Controller chart shall fit in behind controller door. c. Chart shall be a blackline print with a different pastel transparent color to show each separate zone. Verify that the zone number as shown on the Controller Chart matches the number on the actual control valve identification tag d. When completed and approved, hermetically seal the chart between two pieces of plastic. e. The charts shall be completed before the project can be considered complete. 1. The contractor shall provide the Owner the necessary keys and/or other tools necessary to operate/drain/activate the system and spend sufficient time with the Owner to insure that the system operation/maintenance/winterizing can continue after departure of the Contractor. The Contractor will be liable for all damages or losses resulting from failure to comply with the provisions of this paragraph. G. Functional Test: 1. Functional test of the control system shall be performed and demonstrate that all parts of the control system function as specified or intended. The functional test for each new system shall consist of not less than 30 days of continuous, satisfactory operation. H. Any materials determined to be faulty in part of the installation shall be replaced or corrected by the Contractor at his expense in a manner respective to the Plans, Details and other sections of this Specification. In the event of a system failure due to a faulty part of installation, the 30 day period will be repeated until testing is complete I. Any materials determined to be faulty in part of the installation shall be replaced or corrected by the Contractor at his expense in a manner respective to the Plans, Details and other sections of this Specification. In the event of a system failure due to a faulty part of installation, the 30 day period will be repeated until testing is complete 3.8 FINAL COMPLETION A. Upon completion and approval of all tests, inspections, training, manuals, as -built drawings, and other requirements of this Section, the Owner shall write a letter to the Contractor transferring the project to the Owner's Maintenance and Operation's personnel. B. Completion of the system will be contingent upon Contractor providing signed and approved irrigation/plumbing/health/electrical permits as may be applicable. 217021 B-52 MEMORIAL PARK PH2 10-23-18 MUSEUM OF FLIGHT PERMIT SUBMITTAL IRRIGATLON SECTION 328400 - 14 3.9 GUARANTEE A. Contractor shall submit a written guarantee, in approved form, stating that all work showing defects in materials or workmanship will be repaired or replaced at no cost to the Owner for a period of one (1) year from date of Final Completion. B. A final site meeting shall take place eleven months after the date of final Completion. The system shall be examined by the Owner to determine if the system requires alterations or replacements covered in the Guarantee. C. The sample Guarantee Form following this section may be re -typed on Contractor's letterhead and contain the following information: 217021 B-52 MEMORIAL PARK PH2 10-23-18 MUSEUM OF FLIGHT PERMIT SUBMITTAL IRRIGATION SECTION 328400 - 15 GUARANTEE FOR IRRIGATION SYSTEM B-52 Memorial Park Museum of Flight We hereby guarantee that the irrigation system we have furnished and installed for the Museum of Flight B-52 Memorial Park is free from defects in materials and workmanship, and the work has been completed in accordance with the drawings and specifications, ordinary wear and tear and unusual abuse, or neglect excepted. We agree to repair or replace any defects in materials or workmanship, which may develop during the period of one year from date of Final Completion. We also agree to correct any damage resulting from the repairing or replacing of such defects at no additional cost to the Owner. We shall make such repairs or replacements within a reasonable time, as determined by the Owner, after receipt of written notice. In the event of our failure to make such repair or replacements within a reasonable time after receipt of written notice, we authorize the Owner to proceed to have said repairs or replacements made at our expense and we will pay the costs and charges therefore upon demand. Project Name: Designer of Work: Project Location: Authorized Contractor Representative Signed: Date Title: Approved by: (Project Owner) effective Dates of Guarantee Start (Approved Date of Final Completion): Warranty Testing Date / Completion of Guarantee Period: END OF SECTION 328400 217021 B-52 MEMORIAL PARK PH2 10-23-18 MUSEUM OF FLIGHT PERMIT SUBMITTAL PLANTING SOILS SECTION 329100 - 1 SECTION 329115 — SOIL PREPARATION PART 1 - GENERAL 1.1 RELATED DOCUMENTS A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section. 1.2 SUMMARY A. Section Includes: 1. Soil specifications and amendments for on -grade, on -structure applications, and suspended paving systems. B. Related Sections: 1. Division 31 Section " Tree and Plant Protection" for protecting, trimming, pruning, repairing, and replacing existing trees to remain that interfere with, or are affected by, execution of the Work. 2. Division 31 Section "Earth Moving" for excavation, filling, and rough grading and for subsurface aggregate drainage and drainage backfill materials. 3. Division 32 Section "Plants" for exterior plants and mulch. 4. Division 32 Section "Suspended Paving System" C. References: The following specifications and standards of the organizations and documents listed in this paragraph form a part of the Specification to the extent required by the references thereto. In the event that the requirements of the following referenced standards and specification conflict with this specification section the requirements of this specification shall prevail. 1. ASTM: American Society of Testing Materials cited section numbers. 2. U.S. Department of Agriculture, Natural Resources Conservation Service, 2003. National Soil Survey Handbook, title 430 -VI. Available Online. 3. US Composting Council www.compostingcouncil.org and http://composti ngcouncil.org/admin/wp-content/plugi ns/wp- pdfupload/pdf/191/LandscapeArch Specs.pdf. 4. Methods of Soil Analysis, as published by the Soil Science Society of America (http://www.soils.org/). 5. Up by Roots: healthy soils and trees in the built environment. 2008. J. Urban. International Society of Arboriculture, Champaign, IL. 217021 B-52 MEMORIAL PARK PH2 10-23-18 MUSEUM OF FLIGHT PERMIT SUBMITTAL PLANTING SOILS SECTION 329100 - 2 1.3 DEFINITIONS A. Acceptable drainage: Drainage rate is sufficient for the plants to be grown. Not too fast and not too slow. Typical rates for installed Planting Soil are between 1 - 5 inches per hour. In natural undisturbed soil a much lower drainage rate, as low as 1/8th inch per hour can still support good plant growth. Wetland plants can grow on top of perched water layers or even within seasonal perched water layers, but could become unstable in high wind events. B. Amendment: material added to Topsoil to produce Planting Soil Mix. Amendments are classified as general soil amendments, fertilizers, biological, and pH amendments. C. Biological Amendment: Amendments such as Mycorrhizal additives, compost tea or other products intended to change the soil biology. D. Compacted soil: soil where the density of the soil is greater that the threshold for root limiting, and further defined in this specification. E. Compost: well decomposed stable organic material as defined by the US Composting Council and further defined in this specification. F. Drainage: The rate at which soil water moves through the soil transitioning the soil from saturated condition to field capacity. Most often expressed as saturated hydraulic conductivity (Ksat; units are inches per hour). G. End of Warranty Acceptance: The date when the Owner's Representative accepts that the plants and work in this section meet all the requirements of the warranty. It is intended that the materials and workmanship warranty for Planting, Planting Soil, and Irrigation (if applicable) work run concurrent with each other, and further defined in this specification. H. Existing Soil: Mineral soil existing at the locations of proposed planting after the majority of the construction within and around the planting site is completed and just prior to the start of work to prepare the planting area for soil modification and/or planting, and further defined in 'this specification. I. Fertilizer: amendment used for the purpose of adjusting soil nutrient composition and balance. 1. Fine grading: The final grading of the soil to achieve exact contours and positive drainage, often accomplished by hand rakes or drag rakes other suitable devices, and further defined in this specification, and further defined in this specification. K. Finished grade: surface or elevation of Planting Soil after final grading and 12 months of settlement of the soil, and further defined in this specification. L. Graded soil: Soil where the A horizon has been stripped and relocated or re -spread; cuts and fills deeper than 12 inches, and further defined in this specification. M. Installed soil: Planting soil and existing site soil that is spread and or graded to form a planting soil, and further defined in this specification. N. Minor disturbance: Minor grading as part of agricultural work that only adjusts the A horizon soil, minor surface compaction in the top 6 inches of the soil, applications of fertilizers, installation of utility pipes smaller than 18 inches in diameter thru the soil zone. 217021 B-52 MEMORIAL PARK PH2 10-23-18 MUSEUM OF FLIGHT PERMIT SUBMITTAL PLANTING SOILS SECTION 329100 - 3 0. Owner's Representative: The person or entity, appointed by the Owner to represent their interest in the review and approval of the work and to serve as the contracting authority with the Contractor. The Owner's Representative may appoint other persons to review and approve any aspects of the work. P. Ped: a clump or clod of soil held together by a combination of clay, organic matter, and fungal hyphae, retaining the original structure of the harvested soil. Q. Planting Soil: Topsoil, or Planting Soil Mixes which are imported or existing at the site, or made from components that exist at the site, or are imported to the site; and further defined in this specification. R. Poor drainage: Soil drainage that is slower than that to which the plants can adapt. This is a wide range of metrics, but generally if the soil is turning grey in color it is reasonable preferable to either to plant moisture adaptive plants at smaller sizes that are young in age with shallow root balls or look at options to improve the drainage S. Scarify: Loosening and roughening the surface of soil and sub soil prior to adding additional soil on top, and further defined in this specification. T. Soil Fracturing: Deep loosening the soil to the depths specified by using a back hoe, and further defined in this specification. U. Soil Horizons: as defined in the USDA National Soil Survey Handbook http://www.nres. usda.gov/wps/porta I/nres/deta iI/soils/scientists/?cid=nres142p2_054242. V. Soil Ripping: Loosening the soil by dragging a ripping shank or chisel thru the soil to the depths and spacing specified, and further defined in this specification. W. Soil Tilling: Loosening the surface of the soil to the depths specified with a rotary tine tilling machine, roto tiller, (or spade tiller), and further defined in this specification. X. Soil trenching: Cutting narrow trenches thru the soil at the depths and spacing specified to loosen the soil profile, and further defined in this specification. Y. Subgrade: surface or elevation of subsoil remaining after completing excavation, or top surface of a fill or backfill, before placing Planting Soil. Z. Substantial Completion Acceptance: The date at the end of the Planting, Planting Soil, and Irrigation installation (if applicable) where the Owner's Representative accepts that all work in these sections is complete and the Warranty period has begun. This date may be different than the date of substantial completion for the other sections of the project, and further defined in this specification. AA. Topsoil: naturally produced and harvested soil from the A horizon or upper layers or the soil as further defined in this specification. BB. Undisturbed soil: Soils with the original A horizon intact that have not been graded or compacted. Soils that have been farmed, subjected to fire or logged but not graded, and natural forested land will be considered as undisturbed. 217021 B-52 MEMORIAL PARK PH2 10-23-18 MUSEUM OF FLIGHT PERMIT SUBMITTAL PLANTING SOILS SECTION 329100 - 4 1.4 SUBMITTALS A. Product data and certificates: For each type of manufactured product, submiit data and certificates that the product meets the specification requirements, signed by the product manufacturer, and complying with the following: 1. Submit manufacturers or supplier's product data and literature certified analysis for standard products and bulk materials, complying with testing requirements and referenced standards and specific requested testing. a. For each Compost product submit the following analysis by a recognized laboratory: 1) pH 2) Salt concentration (electrical conductivity) 3) Particle size % passing a selected mesh size, dry weight basis 4) Stability carbon dioxide evolution rate mg CO2 -C per g OM per day 5) Physical contaminants (inerts) %, dry weight basis 6) US EPA Class A standard, 40CFR § 503.13, Tables 1 and 3 levels Chemical Contaminants mg/kg (ppm) b. For Coarse Sand product submit the following analysis by a recognized laboratory: 1) pH 2) Particle size distribution B. Samples: Submit samples of each product and material, where required by Part 2 of the specification, to the Owner's Representative for approval. Label samples to indicate product, characteristics, and locations in the work. Samples will be reviewed for appearance only. 1. Samples of all Topsoil, Coarse Sand, Compost and Planting Soil shall be submitted at the same time as the particle size and physical analysis of that material. C. Soil testing for Imported Topsoil and Planting Soil Mixes. 1. Topsoil and Planting Soil Mix testing: Submit soil test analysis report for each sample of Topsoil and Planting Soil from an approved soil -testing laboratory and where indicated in Part 2 of the specification as follows: a. Submit Topsoil, Planting Soil, Compost, and Coarse Sand for testing at least 8 weeks before scheduled installation of Planting Soil Mixes. Submit Planting Soil Mix test no more than 2 weeks after the approval of the Topsoil, Compost and Coarse Sand. Do not submit to the testing laboratory, Planting Soil Mixes, for testing until all Topsoil, Compost and Coarse Sand have been approved. b. If tests fail to meet the specifications, obtain other sources of material, retest and resubmit until accepted by the Owner's Representative. c. All soil testing will be at the expense of the Contractor. 2. Provide a particle size analysis (% dry weight) and USDA soil texture analysis. Soil testing of Planting Soil Mixes shall also include USDA gradation (percentage) of gravel, coarse sand, medium sand, and fine sand in addition to silt and clay. 3. Provide the following other soil properties: a. pH and buffer pH. b. Percent organic content by oven dried weight. 217021 B-52 MEMORIAL PARK PH2 10-23-18 MUSEUM OF FLIGHT PERMIT SUBMITTAL PLANTING SOILS SECTION 329100 - 5 c. Nutrient levels by parts per million including: phosphorus, potassium, magnesium, manganese, iron, zinc and calcium. Nutrient test shall include the testing laboratory recommendations for supplemental additions to the soil for optimum growth of the plantings specified. d. Soluble salt by electrical conductivity of a 1:2 soil water sample measured in Milliohm per cm. e. Cation Exchange Capacity (CEC). 1.5 OBSERVATION OF THE WORK A. The Owner's Representative may observe the work at any time. They may remove samples of materials for conformity to specifications. Rejected materials shall be immediately removed from the site and replaced at the Contractor's expense. The cost of testing materials not meeting specifications shall be paid by the Contractor. B. The Owner's Representative shall be informed of the progress of the work so the work may be observed at the following key times in the construction process. The Owner's Representative shall be afforded sufficient time to schedule visit to the site. Failure of the Owner's Representative to make field observations shall not relieve the Contractor from meeting all the requirements of this specification. 1. EXCAVATION REVIEW: Observe each area of excavation prior to the installation of any Planting Soil. 2. DRAINAGE LAYER INSTALLATION REVIEW: Upon completion of the installation of drainage layer and prior to the installation of any Planting Soil. 3. COMPLETION of SOIL MODIFICATIONS REVIEW: Upon completion of all soil modification and installation of planting soil. 4. COMPLETION OF FINE GRADING AND SURFACE SOIL MODIFICATIONS REVIEW: Upon completion of all surface soil modifications and fine grading but prior to the installation of shrubs, ground covers, or lawns. 1.6 PRE -CONSTRUCTION CONFERENCE A. Schedule a pre -construction meeting with the Owner's Representative at least seven (7) days before beginning work to review any questions the Contractor may have regarding the work, administrative procedures during construction and project work schedule. 1.7 QUALITY ASSURANCE A. Installer Qualifications: A qualified landscape Installer whose work has resulted in successful establishment of plants. 1. Experience: Submit statement and outline of qualifications showing five years' experience in landscape installation and a minimum of five projects that are similar in 217021 B-52 MEMORIAL PARK PH2 10-23-18 MUSEUM OF FLIGHT PERMIT SUBMITTAL PLANTING SOILS SECTION 329100 - 6 scale and complexity in addition to requirements in Division 01 Section "Quality Requirements." 2. Installer's Field Supervision: Require Installer to maintain an experienced full-time supervisor on Project site when work is in progress. B. Soil -Testing Laboratory Qualifications: an independent laboratory, with the experience and capability to conduct the testing indicated and that specializes in USDA agricultural soil testing, Planting Soil Mixes, and the types of tests to be performed. Geotechnical engineering testing labs shall not be used. C. All delivered and installed Planting Soil shall conform to the approved submittals sample color, texture and approved test analysis. 1. The Owner's Representative may request samples of the delivered or installed soil be tested, at the cost of the Contractor, for analysis to confirm the Planting Soil conforms to the approved material. 2. All testing shall be performed by the same soil lab that performed the original Planting Soil testing. 3. Testing results shall be within 10% plus or minus of the values measured in the approved Planting Soil Mixes. 4. Any Planting Soil that fails to meet the above criteria, if requested by the Owner's Representative, shall be removed and new soil installed. 1.8 SITE CONDITIONS A. It is the responsibility of the Contractor to be aware of all surface and subsurface conditions, and to notify the Owner's Representative, in writing, of any circumstances that would negatively impact the health of plantings. Do not proceed with work until unsatisfactory conditions have been corrected. 1. Should subsurface drainage or soil conditions be encountered which would be detrimental to growth or survival of plant material, the Contractor shall notify the Owner's Representative in writing, stating the conditions and submit a proposal covering cost of corrections. If the Contractor fails to notify the Owner's Representative of such conditions, they shall remain responsible for plant material under the warrantee clause of the specifications. 2. This specification requires that all Planting Soil and Irrigation work be completed and accepted prior to the installation of any plants. B. Environmental Requirements: 1. Plant or install materials during normal planting seasons for each type of planting required. 2. Planting shall not be permitted during the following conditions: a. Cold weather: less than 32° F. b. Hot weather: greater than 90° F. c. Wet weather: saturated soil. d. Windy weather: wind velocity greater than 30 m.p.h. 217021 B-52 MEMORIAL PARK PH2 10-23-18 MUSEUM OF FLIGHT PERMIT SUBMITTAL PLANTING SOILS SECTION 329100 - 7 3. Prepare soil only when topsoil is not saturated, muddy or frozen. 1.9 SOIL COMPACTION — GENERAL REQUIREMENTS A. Except where more stringent requirements are defined in this specification, the following parameters shall define the general description of the threshold points of soil compaction in existing, modified or installed soil and subsoil. 1. Standard Proctor Method ASTM D 698 B. The following are threshold levels of compaction as determined by each method. 1. Acceptable Compaction: Good rooting anticipated, but increasing settlement expected as compaction is reduced and/or in soil with a high organic matter content. a. Standard Proctor Method — 75-85%; soil below 75% is unstable and will settle excessively. 2. Root limiting Compaction: Root growth is limited with fewer, shorter and slower growing roots. a. Standard Proctor Method — above approximately 85%. 3. Excessive Compaction: Roots not likely to grow but can penetrate soil when soil is above field capacity. a. Standard Proctor Method—Above90%. 1.10 DELIVERY, STORAGE, AND HANDLING A. Weather: Do not mix, deliver, place or grade soils when frozen or with moisture above field capacity. B. Protect soil and soil stockpiles, including the stockpiles at the soil blender's yard, from wind, rain and washing that can erode soil or separate fines and coarse material, and contamination by chemicals, dust and debris that may be detrimental to plants or soil drainage. Cover stockpiles with plastic sheeting or fabric at the end of each workday. C. All manufactured packaged products and material shall be delivered to the site in unopened containers and stored in a dry enclosed space suitable for the material and meeting all environmental regulations. Biological additives shall be protected from extreme cold and heat. All products shall be freshly manufactured and dated for the year in which the products are to be used. D. Deliver all chemical amendments in original, unopened containers with original labels intact and legible, which state the guaranteed chemical analysis. Store all chemicals in a weather protected enclosure. E. Bulk material: Coordinate delivery and storage with Owner's Representative and confine materials to neat piles in areas acceptable to Owner's Representative. 217021 B-52 MEMORIAL PARK PH2 10-23-18 MUSEUM OF FLIGHT PERMIT SUBMITTAL PLANTING SOILS SECTION 329100 - 8 1.11 EXCAVATING AND GRADING AROUND UTILITIES A. Contractor shall carefully examine the civil, record, and survey drawings to become familiar with the existing underground conditions before digging. B. Determine location of underground utilities and perform work in a manner that will avoid damage. Hand excavate as required. Maintain grade stakes set by others until parties concerned mutually agree upon removal. C. Notification of the local utility locator service is required for all planting areas. The Contractor is responsible for knowing the location and avoiding utilities that are not covered by the local utility locator service. 1.12 WARRANTY A. Special Warranty: Installer agrees to warrant all work for one year from the date of Final Completion. PART 2 - PRODUCTS 2.1 IMPORTED TOPSOIL A. Type A: "Bioretention Mix", as available from Corliss Resources, (253) 343-8169: 1. A Mix of Sand, and Compost. The approximate Mix ratio shall be: Mix component% by moist volume Utility Sand 60-70% Medium Compost 30-40% 2. Final tested organic matter between 4.0 and 7.0% (by dry weight). 3. Conductivity in mmhs/cm <2 4. pH shall be 6.0-7.5 5. CEC shall be 5-10 meq/100g 6. Soluble salt content shall be less than 3.0 mmhos/cm. 7. At the time of final grading, add fertilizer if required to the Planting Soil at rates recommended by the testing results for the plants to be grown. 2.2 COMPOST A. Composted material must be in compliance with WA Department of Ecology's specifications, which appear in WAC Chapter 173-350 Section 220; plus the following additional requirements: 1. The carbon to nitrogen ratio of the compost shall be below 25:1 or below 35:1 if the proposed plantings are composed entirely of plants native to the Puget Sound lowlands region. 217021 B-52 MEMORIAL PARK PH2 10-23-18 MUSEUM OF FLIGHT PERMIT SUBMITTAL PLANTING SOILS SECTION 329100 - 9 2. The compost shall have an organic matter content of 35% to 65% as determined by "loss on ignition" test method. B. Compost feedstocks shall be: 98% landscape waste (Type I) 2% food waste (Type III) C. Compost shall meet the following particle size distribution: D. E. F. G. H. J. K. Sieve 1 inch (9.5 mm) 5/8 inch (9.5 mm) 1/4 inch (9.5 mm) Percent passing 99-100 90-100 40-90 pH shall be between 5.5 and 8.0. Manufactured inert material shall be less than 1% percent by dry weight. Organic matter content shall be between 45 and 65 percent by dry weight. Soluble salt content less than 6.0 mmhos/cm. Maturity shall be over 80% per TMECC 05.05-A, "Germination and Vigor." Stability shall be 7 or below per TMECC method 05.08-B. Yard waste shall be from a permitted composting facility. Provide a two gallon sample with manufacturer's literature and material certification that the product meets the requirements. 2.3 COARSE SAND A. Clean, washed, sand, free of toxic materials 1. Coarse concrete sand, ASTM C-33 Fine Aggregate, with a Fines Modulus Index of 2.8 and 3.2. 2. Coarse Sands shall be clean, sharp, natural Coarse Sands free of limestone, shale and slate particles. Manufactured Coarse Sand shall not be permitted. 3. pH shall be lower than 7.0. 4. Provide Coarse Sand with the following particle size distribution: Sieve Percent passing 3/8 inch (9.5 mm) 100 No 4 (4.75 mm) 95-100 No 10 (2.36 mm) 75-90 No 40 (.30 mm) 25-40 No 100 (.15 mm) 4-10 No 200 (0.75 mm) 2-5 217021 B-52 MEMORIAL PARK PH2 MUSEUM OF FLIGHT PERMIT SUBMITTAL 10-23-18 PLANTING SOILS SECTION 329100 - 10 B. Efforts should be made to use aggregate with gradation meeting Coefficient of Uniformity equal to 4 or above; and Coefficient of Curve of 1 to 3. C. Provide a two gallon sample with manufacturer's literature and material certification that the product meets the requirements. 2.4 LIME A. ASTM C 602, agricultural limestone containing a minimum 80 percent calcium carbonate equivalent and as follows: 1. Class: Class T, with a minimum 99 percent passing through No. 8 sieve and a minimum 75 percent passing through No. 60 sieve. 2. Provide lime in form of dolomitic limestone. B. Provide manufacturer's literature and material certification that the product meets the requirements. 2.5 PLANTING SOIL MIXES A. Planting Mix Mix component% by moist volume Imported Topsoil 100% 1. Imported Topsoil, as available from Corliss Resources, (253) 343-8169. 2. Imported Topsoil to be used at meadow planting area, bioretention area, shrub area and lawn. 3. Depths: a. As shown in landscape details. 4. Final tested organic matter between 4 and 7% (by dry weight). 5. At the time of final grading, add fertilizer if required to the Planting Soil at rates recommended by the testing results for the plants to be grown. 6. Provide testing data that includes recommendations for chemical additives for the types of plants to be grown. Samples and testing data shall be submitted at the same time. PART 3 -EXECUTION 3.1 SITE EXAMINATION A. Prior to installation of Planting Soil, examine site to confirm that existing conditions are satisfactory for the work of this section to proceed. 1. Confirm that the subgrade is at the proper elevation and compacted as required. Subgrade elevations shall slope as shown on the drawings. 2. Confirm that surface of all areas to be filled with Planting Soil are free of construction debris, refuse, compressible or biodegradable materials, stones greater than 2 inches 217021 B-52 MEMORIAL PARK PH2 10-23-18 MUSEUM OF FLIGHT PERMIT SUBMITTAL PLANTING SOILS SECTION 329100 - 11 diameter, soil crusting films of silt or clay that reduces or stops drainage from the Planting Soil into the subsoil; and/or standing water. Remove unsuitable material from the site. 3. Confirm that subgrade has been prepared. 4. Confirm that no adverse drainage conditions are present. 5. Confirm that no conditions are present which are detrimental to plant growth. 6. Confirm that utility work has been completed per the drawings. 7. Confirm that irrigation work, which is shown to be installed below prepared soil levels, has been completed. B. If unsatisfactory conditions are encountered, notify the Owner's Representative immediately to determine corrective action before proceeding. 3.2 COORDINATION WITH PROJECT WORK A. The Contractor shall coordinate with all other work that may impact the completion of the work. B. Prior to the start of work, prepare a detailed schedule of the work for coordination with other trades. C. Coordinate the relocation of any irrigation lines, heads or the conduits of other utility lines that are in conflict with tree locations. Root balls shall not be altered to fit around lines. Notify the Owner's Representative of any conflicts encountered. 3.3 GRADE AND ELEVATION CONTROL A. Provide grade and elevation control during installation of Planting Soil. Utilize grade stakes, surveying equipment, and other means and methods to assure that grades and contours conform to the grades indicated on the plans. 3.4 SITE PREPARATION A. Excavate to the proposed subgrade. Maintain all required angles of repose of the adjacent materials as shown on the drawings or as required by this specification. Do not over excavate compacted subgrades of adjacent pavement or structures. Maintain a supporting 1:1 side slope of compacted subgrade material along the edges of all paving and structures where the bottom of the paving or structure is above the bottom elevation of the excavated planting area. B. Remove all construction debris and material including any construction materials from the subgrade. C. Confirm that the subgrade is at the proper elevation and compacted as required. Subgrade elevations shall slope approximately parallel to the finished grade as shown on the drawings. D. In areas where Planting Soil is to be spread, confirm subgrade has been scarified. 217021 B-52 MEMORIAL PARK PH2 10-23-18 MUSEUM OF FLIGHT PERMIT SUBMITTAL PLANTING SOILS SECTION 329100 - 12 E. Protect adjacent walls, walks and utilities from damage or staining by the soil. Use 1/2 inch plywood and or plastic sheeting as directed to cover existing concrete, metal and masonry work and other items as directed during the progress of the work. 1. At the end of each working day, clean up any soil or dirt spilled on any paved surface. 2. Any damage to the paving or site features or work shall be repaired at the Contractor's expense. 3.5 SOIL MOISTURE A. Volumetric soil moisture level, in both the Planting Soil and the root balls of all plants, prior to, during and after planting shall be above permanent wilt point and below field capacity for each type of soil texture within the following ranges. Soil texture Permanent wilting point Field capacity Sand, Loamy sand, Sandy loam 5-8% 12-18% Loam, Sandy clay, Sandy clay loam 14-25% 27-36% Clay loam, Silt loam 11-22% 31-36% Silty clay, Silty clay loam 22-27% 38-41% B. If moisture is too low, the planting holes shall be filled with water and allowed to drain before starting any planting operations. If the moisture is too high, suspend planting operations until the soil moisture drains to below field capacity. 3.6 PLANTING SOIL AND PLANTING SOIL MIX INSTALLATION A. Prior to installing any Planting Soil Mixes blended off site, the Owner's Representative shall approve the condition of the subgrade and the previously installed subgrade preparation and the installation of subsurface drainage. B. All equipment utilized to install or grade Planting Soils shall be wide track or balloon tire machines rated with a ground pressure of 4 psi or Tess. All grading and soil delivery equipment shall have buckets equipped with 6 inch long teeth to scarify any soil that becomes compacted. C. In areas of soil installation above existing subsoil, scarify the subgrade material prior to installing Planting Soil. 1. Scarify the subsoil of the subgrade to a depth of 3 — 6 inches with the teeth of the back hoe or loader bucket, tiller or other suitable device. 2. Immediately install the Planting Soil. Protect the loosened area from traffic. DO NOT allow the loosened subgrade to become compacted. 217021 B-52 MEMORIAL PARK PH2 10-23-18 MUSEUM OF FLIGHT PERMIT SUBMITTAL PLANTING SOILS SECTION 329100 - 13 3. In the event that the loosened area becomes overly compacted, loosen the area again prior to installing the Planting Soil. D. Install the Planting Soil in 12 -18 inch lifts to the required depths. Apply compacting forces to each lift as required to attain the required compaction. Scarify the top of each lift prior to adding more Planting Soil by dragging the teeth of a loader bucket or backhoe across the soil surface to roughen the surface. E. Phase work such that equipment to deliver or grade soil does not have to operate over previously installed Planting Soil. Work in rows of lifts the width of the extension of the bucket on the loader. Install all lifts in one row before proceeding to the next. Work out from the furthest part of each bed from the soil delivery point to the edge of the each bed area. F. Where possible place large trees first and fill Planting Soil around the root ball. G. Where travel over installed soil is unavoidable, limit paths of traffic to reduce the impact of compaction in Planting Soil. Each time equipment passes over the installed soil it shall reverse out of the area along the same path with the teeth of the bucket dropped to scarify the soil. Comply with the paragraph "Compaction Reduction" (section 3.9) in the event that soil becomes over compacted. H. The depths and grades shown on the drawings are the final grades after settlement and shrinkage of the compost material. The Contractor shall install the Planting Soil at a higher level to anticipate this reduction of Planting Soil volume, taking into account the displacement of root balls and container stock. A minimum settlement of approximately 10 - 15% of the soil depth is expected. All grade increases are assumed to be as measured prior to addition of surface Compost till layer, mulch, or sod. 3.7 COMPACTION REQUIREMENTS FOR INSTALLED PLANTING SOIL A. Compact installed Planting Soil to the compaction rates indicated and using the methods approved for the soil mockup. Compact each soil lift as the soil is installed. B. Maintain moisture conditions within the Planting Soil during installation or modification to allow for satisfactory compaction. Suspend operations if the Planting Soil becomes wet. Apply water if the soil is overly dry. C. Provide adequate equipment to achieve consistent and uniform compaction of the Planting Soils. Use the smallest equipment that can reasonably perform the task of spreading and compaction. Use the same equipment and methods of compaction used to construct the Planting Soil mockup. D. Do not pass motorized equipment over previously installed and compacted soil except as authorized below. 1. Light weight equipment such as trenching machines or motorized wheel barrows is permitted to pass over finished soil work. 2. If work after the installation and compaction of soil compacts the soil to levels greater than the above requirements, follow the requirements of the paragraph "Over Compaction Reduction" below. 217021 B-52 MEMORIAL PARK PH2 10-23-18 MUSEUM OF FLIGHT PERMIT SUBMITTAL PLANTING SOILS SECTION 329100 - 14 3.8 OVER COMPACTION REDUCTION A. Any soil that becomes compacted to a density greater than the specified density and/or the density in the approved mockup shall be dug up and reinstalled. This requirement includes compaction caused by other sub -contractors after the Planting Soil is installed and approved. B. Surface roto tilling shall not be considered adequate to reduce over compaction at levels 6 inches or greater below finished grade. 3.9 INSTALLATION OF CHEMICAL ADDITIVES A. Following the installation of each soil and prior to fine grading and installation of mulch layer, apply chemical additives as recommended by the soil test, and appropriate to the soil and specific plants to be installed. B. Types, application rates and methods of application shall be approved by the Owner's Representative prior to any applications. 3.10 FINE GRADING A. The Owner's Representative shall approve all rough grading prior to fine grading, planting, and mulching. B. Grade the finish surface of all planted areas to meet the grades shown on the drawings, allowing the finished grades to remain higher (10 — 15% of depth of soil modification) than the grades on the grading plan, as defined in paragraph Planting Soil Installation, to anticipate settlement over the first year. C. Utilize hand equipment, small garden tractors with rakes, or small garden tractors with buckets with teeth for fine grading to keep surface rough without further compaction. Do not use the flat bottom of a loader bucket to fine grade, as it will cause the finished grade to become overly smooth and or slightly compressed. D. Provide for positive drainage from all areas toward the existing inlets, drainage structures and or the edges of planting beds. Adjust grades as directed to reflect actual constructed field conditions of paving, wall and inlet elevations. Notify the Owner's Representative in the event that conditions make it impossible to achieve positive drainage. E. Provide smooth, rounded transitions between slopes of different gradients and direction. Modify the grade so that the finish grade before adding mulch and after settlement is one or two inches below all paving surfaces or as directed by the drawings. F. Fill all dips and remove any bumps in the overall plane of the slope. The tolerance for dips and bumps in shrub and ground cover planting areas shall be a 2 inch deviation from the plane in 10 feet. The tolerance for dips and bumps in lawn areas shall be a 1 inch deviation from the plane in 10 feet. 217021 B-52 MEMORIAL PARK PH2 10-23-18 MUSEUM OF FLIGHT PERMIT SUBMITTAL PLANTING SOILS SECTION 329100 - 15 3.11 CLEAN-UP A. During installation, keep the site free of trash, pavements reasonably clean and work area in an orderly condition at the end of each day. Remove trash and debris in containers from the site no less than once a week. 1. Immediately clean up any spilled or tracked soil, fuel, oil, trash or debris deposited by the Contractor from all surfaces within the project or on public right of ways and neighboring property. B. Once installation is complete, wash all soil from pavements and other structures. Ensure that mulch is confined to planting beds and that all tags and flagging tape are removed from the site. 1. Make all repairs to grades, ruts, and damage to the work or other work at the site. 2. Remove and dispose of all excess Planting Soil, subsoil, mulch, plants, packaging, and other material brought to the site by the Contractor. 3.12 PLANTING SOIL PROTECTION A. The Contractor shall protect installed Planting Soil from damage including contamination and over compaction due to other soil installation, planting operations, and operations by other Contractors or trespassers. Maintain protection during installation until acceptance. Utilize fencing and matting as required or directed to protect the finished soil work. Treat, repair or replace damaged Planting Soil immediately. B. Loosen compacted Planting Soil and replace Planting Soil that has become contaminated as determined by the Owner's Representative. Planting Soil shall be loosened or replaced at no expense to the Owner. 1. Till and restore grades to all soil that has been driven over or compacted during the installation of plants. 3.13 PROTECTION DURING CONSTRUCTION A. The Contractor shall protect planting and related work and other site work from damage due to planting operations, operations by other Contractors or trespassers. 1. Maintain protection during installation until the date of plant acceptance (see specifications section — Planting). Treat, repair or replace damaged work immediately. 2. Provide temporary erosion control as needed to stop soil erosion until the site is stabilized with mulch or plantings. B. Damage done by the Contractor, or any of their sub -contractors to existing or installed plants, or any other parts of the work or existing features to remain, including large existing trees, soil, paving, utilities, lighting, irrigation, other finished work and surfaces including those on adjacent property, shall be cleaned, repaired or replaced by the Contractor at no expense to the Owner. The Owner's Representative shall determine when such cleaning, replacement or repair is satisfactory. Damage to existing trees shall be assessed by a certified arborist. 217021 B-52 MEMORIAL PARK PH2 10-23-18 MUSEUM OF FLIGHT PERMIT SUBMITTAL PLANTING SOILS SECTION 329100 - 16 3.14 SUBSTANTIAL COMPLETION ACCEPTANCE A. Upon written notice from the Contractor, the Owners Representative shall review the work and make a determination if the work is substantially complete. B. The date of substantial completion of the planting soil shall be the date when the Owner's Representative accepts that all work in Planting, Planting Soil, and Irrigation installation sections is complete. 3.15 FINAL ACCEPTANCE / SOIL SETTLEMENT A. At the end of the plant warranty and maintenance period, (see Specification section 329300 Plants) the Owner's Representative shall observe the soil installation work and establish that all provisions of the contract are complete and the work is satisfactory. 1. Restore any soil settlement and or erosion areas to the grades shown on the drawings. When restoring soil grades remove plants and mulch and add soil before restoring the planting. Do not add soil over the root balls of plants or on top of mulch. B. Failure to pass acceptance: If the work fails to pass final acceptance, any subsequent observations must be rescheduled as per above. The cost to the Owner for additional observations will be charged to the Contractor at the prevailing hourly rate of the Owner's Representative. END OF SECTION 217021 B-52 MEMORIAL PARK PH2 10-23-18 MUSEUM OF FLIGHT PERMIT SUBMITTAL TURF AND GRASSES SECTION 329200 - 1 PART 1 GENERAL 1.1 SUMMARY A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and division 01 Specification Sections, apply to this Section B. Section Includes: 1. Sod. 2. Hand -seeding as needed for existing lawn restoration. C. Related Sections: 1. Division 32 Section "Irrigation" for landscape irrigation. 2. Division 32 Section "Plants" for exterior plants and mulch. 3. Division 32 Section "Planting Soil" for planting soils. 1.2 DEFINITIONS A. Finish Grade: Elevation of finished surface, which is top of mulch for planting areas, top of planting sod for hydroseeding and seeding areas, and top of sod for sod areas. B. Pesticide: A substance or mixture intended for preventing, destroying, repelling, or mitigating a pest. This includes insecticides, miticides, herbicides, fungicides, rodenticides, and molluscicides. It also includes substances or mixtures intended for use as a plant regulator, defoliant, or desiccant. C. Pests: Living organisms that occur where they are not desired or that cause damage to plants, animals, or people. These include insects, mites, grubs, mollusks (snails and slugs), rodents (gophers, moles, and mice), unwanted plants (weeds), fungi, bacteria, and viruses. D. Planting Soil: Standardized topsoil; existing, native surface topsoil; existing, in-place surface soil; imported topsoil; or manufactured topsoil that is modified with soil amendments and perhaps fertilizers to produce a soil mixture best for plant growth. E. Subgrade: Surface or elevation of subsoil remaining after excavation is complete, or top surface of a fill or backfill before planting soil is placed. F. Subsoil: All soil beneath the topsoil layer of the soil profile, and typified by the lack of organic matter and soil organisms. 1.3 REFERENCES A. Turf Grass Producers International (TPI): 1. Guideline Specifications to Turfgrass Sodding. 1.4 SUBMITTALS A. Product Data: For each type of product indicated. 1. Pesticides and Herbicides: Include product label and manufacturer's application instructions specific to this Project. 217021 B-52 MEMORIAL PARK PH2 10-23-18 THE MUSEUM OF FLIGHT PERMIT SUBMITTAL TURF AND GRASSES SECTION 329200 - 2 B. Certification of Grass Seed: From seed vendor for each grass -seed monostand or mixture stating the botanical and common name, percentage by weight of each species and variety, and percentage of purity, germination, and weed seed. Include the year of production and date of packaging. C. Certification of each seed mixture for turfgrass sod. Include identification of source and name and telephone number of supplier. D. Qualification Data: For qualified landscape Installer. E. Product Certificates: For fertilizers, from manufacturer. F. Maintenance Instructions: Recommended procedures to be established by Owner for maintenance of grasses during a calendar year. Submit before expiration of required initial maintenance periods. 1.5 QUALITY ASSURANCE A. Installer Qualifications: A qualified landscape Installer whose work has resulted in successful turf establishment. 1. Professional Membership: Installer shall be a member in good standing of either the Professional Landcare Network or the American Nursery and Landscape Association. 2. Experience: Five years' experience in turf installation in addition to requirements in Division 01 Section "Quality Requirements." 3. Installer's Field Supervision: Require Installer to maintain an experienced full-time supervisor on Project site when work is in progress. 4. Pesticide Applicator: State licensed, commercial. B. Preinstallation Conference: Schedule conference at with Architect a minimum of two weeks prior to the start of work. 1.6 DELIVERY, STORAGE, AND HANDLING A. Seed and Other Packaged Material: Deliver packaged materials in original, unopened containers showing weight, certified analysis, name and address of manufacturer, and indication of conformance with state and federal laws, as applicable. B. Sod: Harvest, deliver, store, and handle sod according to requirements in "Specifications for Turfgrass Sod Materials" and "Specifications for Turfgrass Sod Transplanting and Installation" in TPI's "Guideline Specifications to Turfgrass Sodding." Deliver sod in time for planting within 24 hours of harvesting. Protect sod from breakage and drying. C. Bulk Materials: 1. Do not dump or store bulk materials near structures, utilities, walkways and pavements, or on existing turf areas or plants. 2. Provide erosion -control measures to prevent erosion or displacement of bulk materials; discharge of soil -bearing water runoff; and airborne dust reaching adjacent properties, water conveyance systems, or walkways. 3. Accompany each delivery of bulk materials with appropriate certificates. 217021 B-52 MEMORIAL PARK PH2 10-23-18 THE MUSEUM OF FLIGHT PERMIT SUBMITTAL TURF AND GRASSES SECTION 329200 - 3 1.7 PROJECT CONDITIONS A. Seeding and sod installation prior to April 15th and after October 15th may proceed only upon approval by Architect. B. Weather Limitations: Proceed with planting only when existing and forecasted weather conditions permit planting to be performed when beneficial and optimum results may be obtained. Apply products during favorable weather conditions according to manufacturer's written instructions. 1.8 SEQUENCING/SCHEDULING A. Provide the following notices to the Architect and Owner: 1. Before Owner is to assume maintenance responsibility: 5 days. 2. In advance of final surface preparation prior to planting operations: 5 days. 3. Before time requested for inspection for Substantial Completion: 5 days 4. Architect may choose to waive or shorten the required lead time for project reviews, at their discretion. 1.9 WARRANTY A. Special Warranty: Installer agrees to repair or replace plantings and accessories that fail in materials, workmanship, or growth within specified warranty period. 1. Failures include, but are not limited to, the following: a) Death and unsatisfactory growth, except for defects resulting from abuse, lack of adequate maintenance, or neglect by Owner, or incidents that are beyond Contractors control. 2. The warranty of all plant materials including turf and grasses will extend one year from the date of Final Completion for all work under this contract. 3. Include the following remedial actions as a minimum: a) Immediately remove dead plants and replace unless required to plant in the succeeding planting season. b) Replace plants that are more than 25 percent dead or in an unhealthy condition at end of warranty period. c) A limit of one replacement of each plant will be required except for losses or replacements due to failure to comply with requirements. d) Provide extended warranty for period equal to original warranty period, for replaced plant material. 1) Acceptance of lawn areas will be based upon growth of a uniform color and dense stand of grass, without bare spots larger than 5" x 5" square. Seeded or sodded areas, which fail to produce acceptable growth, shall be re -sodded at no change in Contract Amount. 2) Another inspection will be conducted at the end of the extended warranty period if any, to determine acceptance or rejection. 1.10 MAINTENANCE SERVICE A. Initial Turf Maintenance Service: Provide full maintenance by skilled empbyees of landscape Installer. Maintain as required in Part 3. Begin maintenance immediately after each area is planted and continue until acceptable turf is established but for not less than the following periods: 217021 B-52 MEMORIAL PARK PH2 10-23-18 THE MUSEUM OF FLIGHT PERMIT SUBMITTAL TURF AND GRASSES SECTION 329200 - 4 1. Seeded Turf: When initial maintenance period has not elapsed before end of planting season, or if turf is not fully established, continue maintenance during next planting season. 2. Sodded Turf: 90 days from date of Final Completion. PART 2 PRODUCTS 2.1 TURFGRASS SOD A. Turfgrass Sod: Certified, including limitations on thatch, weeds, diseases, nematodes, and insects, complying with "Specifications for Turfgrass Sod Materials" in TPI's "Guideline Specifications to Turfgrass Sodding." Furnish viable sod of uniform density, color, and texture, strongly rooted, and capable of vigorous growth and development when planted. B. Turfgrass Species: Grass species as follows, with not less than 95 percent germination, not Tess than 85 percent pure seed, and no weed seed. 1. Three-way blend of perennial ryegrasses 2.2 SEED A. Grass Seed: Fresh, clean, dry, new -crop seed complying with AOSA's "Journal of Seed Technology; Rules for Testing Seeds" for purity and germination tolerances. B. Turfgrass Species: Seed of grass species as follows, with not Tess than 95 percent germination, not less than 85 percent pure seed, and no weed seed. 1. Three-way blend of perennial ryegrasses 2.3 PESTICIDES A. General: Pesticide, registered and approved by EPA, acceptable to authorities having jurisdiction, and of type recommended by manufacturer for each specific problem and as required for Project conditions and application. Do not use restricted pesticides unless authorized in writing by authorities having jurisdiction. B. Pre -Emergent Herbicide (Selective and Non -Selective): Effective for controlling the germination or growth of weeds within planted areas at the soil level directly below the mulch layer. C. Post -Emergent Herbicide (Selective and Non -Selective): Effective for controlling weed growth that has already germinated. PART 3 EXECUTION 3.1 EXAMINATION A. Examine areas to be planted for compliance with requirements and other conditions affecting performance. 1. Verify that no foreign or deleterious material or liquid such as paint, paint washout, concrete slurry, concrete layers or chunks, cement, plaster, oils, gasoline, diesel fuel, paint thinner, turpentine, tar, roofing compound, or acid has been deposited in soil within a planting area. 2. Do not mix or place soils and soil amendments in frozen, wet, or muddy conditions. 3. Suspend soil spreading, grading, and tilling operations during periods of excessive soil moisture until the moisture content reaches acceptable levels to attain the required results. 217021 B-52 MEMORIAL PARK PH2 10-23-18 THE MUSEUM OF FLIGHT PERMIT SUBMITTAL TURF AND GRASSES SECTION 329200 - 5 4. Uniformly moisten excessively dry soil that is not workable and which is too dusty. B. Proceed with installation only after unsatisfactory conditions have been corrected. C. If contamination by foreign or deleterious material or liquid is present in soil within a planting area, remove the soil and contamination as directed by Architect and replace with new planting soil. 3.2 PREPARATION A. Protect structures, utilities, sidewalks, pavements, and other facilities, trees, shrubs, and plantings from damage caused by planting operations. 1. Protect grade stakes set by others until directed to remove them. B. Install erosion -control measures to prevent erosion or displacement of soils and discharge of soil -bearing water runoff or airborne dust to adjacent properties and walkways. 3.3 HAND -SEEDING A. Hand -seed to repair existing lawn areas damaged or removed by construction activity. Apply seed at manufacturer's recommended rate. B. Seeding shall not be done during windy weather or when the ground is frozen. 3.4 SOD INSTALLATION A. Lay sod within 24 hours of harvesting. Do not lay sod if dormant or if ground is frozen or muddy. B. Lay sod to form a solid mass with tightly fitted joints. Butt ends and sides of sod; do not stretch or overlap. Stagger sod strips or pads to offset joints in adjacent courses. Avoid damage to subgrade or sod during installation. Tamp and roll lightly to ensure contact with subgrade, eliminate air pockets, and form a smooth surface. Work sifted soil or fine sand into minor cracks between pieces of sod; remove excess to avoid smothering sod and adjacent grass. 1. Lay sod across angle of slopes exceeding 1:3. 2. Anchor sod on slopes exceeding 1:6 with wood pegs spaced as recommended by sod manufacturer but not Tess than 2 anchors per sod strip to prevent slippage. a) Saturate sod with fine water spray within two hours of planting. During first week after planting, water daily or more frequently as necessary to maintain moist soil to a minimum depth of 1-1/2 inches below sod. 3.5 TURF MAINTENANCE A. Maintain and establish turf by watering, fertilizing, weeding, mowing, trimming, replanting, and performing other operations as required to establish healthy, viable turf. Roll, regrade, and replant bare or eroded areas and remulch to produce a uniformly smooth turf. Provide materials and installation the same as those used in the original installation. 1. Fill in as necessary soil subsidence that may occur because of settling or other processes. Replace materials and turf damaged or lost in areas of subsidence. 2. Apply treatments as required to keep turf and soil free of pests and pathogens or disease. Use integrated pest management practices whenever possible to minimize the use of pesticides and reduce hazards. 217021 B-52 MEMORIAL PARK PH2 10-23-18 THE MUSEUM OF FLIGHT PERMIT SUBMITTAL TURF AND GRASSES SECTION 329200 - 6 3. Do not use pesticides or herbicides on hydroseeded areas until allowed by seed supplier. No weed control products should be used in the first 60 days of grass establishment. B. Mow turf as soon as top growth is tall enough to cut. Repeat mowing to maintain specified height without cutting more than 1/3 of grass height. Remove no more than 1/3 of grass -leaf growth in initial or subsequent mowings. Do not delay mowing until grass blades bend over and become matted. Do not mow when grass is wet. Schedule initial and subsequent mowings to maintain the following grass height: Mow grass to a height of 1-1/2 to 2 inches. D. Watering: 1. Schedule watering to prevent wilting, puddling, erosion, and displacement of seed or mulch. 2. Water turf with fine spray at a minimum rate of 1 inch per week unless rainfall precipitation is adequate. 3.6 SATISFACTORY TURF A. Turf installations shall meet the following criteria as determined by Architect: 1. Satisfactory Sodded Turf: At end of maintenance period, a healthy, well -rooted, even - colored, viable turf has been established, free of weeds, open joints, bare areas, and surface irregularities. 2. Satisfactory Seeded Turf: At end of maintenance period, a healthy, uniform, close stand of grass has been established, free of weeds and surface irregularities, with coverage exceeding 90 percent over any 10 sq. ft. and bare spots not exceeding 5 by 5 inches. B. Use specified materials to reestablish turf that does not comply with requirements and continue maintenance until turf is satisfactory. 3.7 CLEANUP AND PROTECTION A. Promptly remove soil and debris created by turf work from paved areas. Clean wheels of vehicles before leaving site to avoid tracking soil onto roads, walks, or other paved areas. B. Erect temporary fencing or barricades and warning signs as required to protect newly planted areas from traffic. Maintain fencing and barricades throughout initial maintenance period and remove after plantings are established. C. Remove nondegradable erosion -control measures after grass establishment period. END OF SECTION 217021 B-52 MEMORIAL PARK PH2 10-23-18 THE MUSEUM OF FLIGHT PERMIT SUBMITTAL SEEDING SECTION 329219 - 1 PART 1 - GENERAL 1.1 SUMMARY A. Furnish all materials, equipment, and labor necessary for Hydroseeding area. B. Section Includes: 1. Soil Preparation — see section 329100 2. Liming and Fertilizing. 3. Seed Mixes for Various Applications. 4. Maintenance and Establishment. C. Related Sections: 1. Division 31 Section "Earth Moving" for excavation, filling, and rough grading and for subsurface aggregate drainage and drainage backfill materials. 2. Division 32 Section "Soils" for planting soils. 1.2 SUBMITTALS A. Submit in accordance with Sections 013310, Submittal Procedures, and 013323, Product Data and Samples. B. Submit seed vendor's certification for required grass seed mixtures, indicating percentage by weight and percentages of purity, germination and weed seed for each species. C. Qualification Data: For qualified landscape Installer. Include list of similar projects completed by Installer demonstrating Installer's capabilities and experience. Include project names, addresses, and year completed, and include names and addresses of owners' contact persons. D. Product Certificates: For each type of manufactured product, from manufacturer, and complying with the following: 1. Manufacturer's certified analysis of standard products. 2. Analysis of other materials by a recognized laboratory made according to methods established by the Association of Official Analytical Chemists, where applicable. 1.3 QUALITY ASSURANCE A. The seed shall be furnished in containers that show the following information: seed name, lot number, net weight, percentage of purity, germination, weed seed and inert material. Seed that has become wet, moldy, or otherwise damaged will not be accepted. Seed shall conform to the requirements of the Washington State seed law and when applicable the Federal Seed Act, and shall be "certified" grade or better. 217021 B-52 MEMORIAL PARK PH2 10-23-18 MUSEUM OF FLIGHT PERMIT SUBMITTAL SEEDING SECTION 329219 - 2 1.4 DELIVERY, STORAGE, AND HANDLING A. Deliver seed and fertilizer materials in original unopened containers showing weight, analysis, and name of manufacturer. Store the seed in such a manner that will prevent the wetting and deterioration of the seed. B. Bulk Materials: 1. Do not dump or store bulk materials near structures, utilities, walkways and pavements, or on existing turf areas or plants. 2. Provide erosion -control measures to prevent erosion or displacement of bulk materials, discharge of soil -bearing water runoff, and airborne dust reaching adjacent properties, water conveyance systems, or walkways. 1.5 PROJECT CONDITIONS A. Grading Inspection: Finish grading, soil placement and preparation shall be inspected and approved by the Architect prior to hydroseed application. B. Field Measurements: Verify actual grade elevations, service and utility locations, irrigation system components, and dimensions of plantings and construction contiguous with new plantings by field measurements before proceeding with planting work. C. Environmental Requirements: 1. Plant or install materials during normal planting seasons for each type of planting required. 2. Planting shall not be permitted during the following conditions: a. Cold weather: less than 32° F. b. Hot weather: greater than 90° F. c. Wet weather: saturated soil. d. Windy weather: wind velocity greater than 30 m.p.h. 3. Prepare soil only when topsoil is not saturated, muddy or frozen. PART 2- PRODUCTS 2.1 SOIL MIX: REFER TO 329100 PLANTING SOILS 2.2 SAND: REFER TO 329100 PLANTING SOILS 2.3 NATIVE AND ADAPTIVE SEED MIX (CUSTOM) A. Seed Rate = 1 Ib./ 1000 sq. ft. B. The Seed Mix: See Planting Plan C. Manufacturer: 1. Heritage Seedlings & Liners, Inc. 2. 4194 - 71st Ave. SE Salem OR 97317 217021 B-52 MEMORIAL PARK PH2 10-23-18 MUSEUM OF FLIGHT PERMIT SUBMITTAL SEEDING SECTION 329219 - 3 3. 503-585-9835 2.4 FERTILIZER A. Initiafl fertilization 1. Contractor to propose amendments based on laboratory nutrient analysis of installed topsoil. No amendments shall be added without approval by Landscape Architect. B. Submittals: submit sample of fertilizer and manufacturer's literature 2.5 JUTE MESH A. Jute Mesh: Jute mesh shall be a uniform, open, plain weave cloth of undyed and unbleached single jute yarn. The yarn shall be of a loosely twisted construction and it shall not vary in thickness more than one-half its normal diameter. Jute mesh shall be furnished in rolled strips and shall meet the following requirements: Width - 48 inches, plus or minus one inch 78 warp - ends per width of cloth, 41 weft - ends per yard. Weight shall average 1.22 pounds per linear yard with a tolerance of plus or minus 5%. PART 3 - EXECUTION 3.1 EXAMINATION A. Examine areas to receive plants for compliance with requirements and conditions affecting installation and performance. 1. Verify that no foreign or deleterious material or liquid such as paint, paint washout, concrete slurry, concrete layers or chunks, cement, plaster, oils, gasoline, diesel fuel, paint thinner, turpentine, tar, roofing compound, or acid has been deposited in soil within a planting area. Soil shall not be saturated at the time of seeding. B. Proceed with installation only after unsatisfactory conditions have been corrected. C. If contamination by foreign or deleterious material or liquid is present in soil within a planting area, remove the soil and contamination as directed by Architect and replace with new planting soil. 3.2 PREPARATION A. Protect structures, utilities, sidewalks, pavements, and other facilities and turf areas and existing plants from damage caused by planting operations. B. Install erosion -control measures to prevent erosion or displacement of soils and discharge of soil - bearing water runoff or airborne dust to adjacent properties and walkways. 217021 B-52 MEMORIAL PARK PH2 10-23-18 MUSEUM OF FLIGHT PERMIT SUBMITTAL SEEDING SECTION 329219 - 4 3.3 SEED BED PREPARATION A. Limit subgrade preparation to areas that shall be planted in the immediate future. B. Refer to 329100 Planting Soils for subgrade prep and soil installation. C. Install 3" deep Sand seed bed directly over uncompacted topsoil. Grade areas to be seeded to a smooth, even surface with loose, uniformly fine texture. Roll and rake, remove ridges, and fill depressions to meet finish grades. D. Refer to 329100 Planting Soils for sand specification. E. Moisten prepared areas to be seeded prior to planting when soils are dry. Water thoroughly and allow surface to dry before seeding. Do not create muddy conditions. Restore prepared areas if eroded or disturbed after fine grading and before planting. 3.4 BROADCAST SEEDING A. Thoroughly mix seed with moistened sawdust carrier. B. Broadcast seeding shall be accomplished using hand -operated "cyclone -type" seeders or rotary broadcast equipment. All machinery shall be equipped with metering devices. Broadcasting by hand shall be acceptable on small, isolated areas. Prior to hand broadcast seeding, divide the seed required into two portions. Apply the first half of the seed and then follow up by applying the second portion to ensure complete coverage by seed. When broadcast seeding, passes shall be made over each site to be seeded in a manner to ensure an even distribution of seed. When using hopper type equipment, seed shall be frequently mixed within the hopper to discourage seed settling and uneven planting distribution of species. C. Broadcast seeding shall take place immediately following the completion of final seedbed preparation techniques and upon inspection and approval of Landscape Architect. Broadcast seeding should not be conducted when wind velocities would prohibit even seed distribution. 3.5 JUTE MESH A. Jute Mesh shall be applied immediately after seeding has been completed. Jute Mesh shall then be anchored to the soil with staples. B. Seeding shall not be done during windy weather (above 25 mph) or when the ground is overly wet (saturated) or frozen. Contractor shall give the Owner 48 hours' notice of seeding operations. Seeding, fertilizing, and mulching of prepared areas shall be performed during the following time frames: 1. Seeding shall be done from April 1 to May 31 or from September 1 to October 31. 2. No seeding shall be done before or after these dates without the Engineer's written approval. Written permission to seed from June 1 to August 31 may be granted only if automatic irrigation is available and operational at the site. Permission to seed from November 1 to March 31 will only be given when completion of the project is imminent and the environmental conditions are conductive to acceptable growth. No seeding shall be done on weekends or legal holidays without written approval of the Engineer. 217021 B-52 MEMORIAL PARK PH2 10-23-18 MUSEUM OF FLIGHT PERMIT SUBMITTAL SEEDING SECTION 329219 - 5 3. Application of pre -germinated seed, moisture retention agents and/or provision for supplemental watering may be required by the Engineer should the Contractor schedule this portion of the Work outside the time frames listed in item 1 immediately above. 4. All areas that are partially completed to grade, shall be prepared and seeded during the first available planting period and shall not be allowed to sit idle for long periods of time without receiving the erosion control specified in the Contract. 5. When environmental conditions are not conductive to acceptable results from seeding operations, the Engineer may order the Work suspended, and it shall be resumed only when the desired results are likely to be obtained. 3.6 MAINTENANCE AND ESTABLISHMENT: A. Maintain all seeded areas until seed mix is well established and exhibits a vigorous growing condition. B. Maintenance shall include protection, watering, fertilizing, weeding and overseeding, as necessary to establish full coverage of seeded area 3.7 PHYSICAL COMPLETION: A. Inspection to determine Final Completion of seeded areas will be made by the Architect upon the Contractor's request. Provide notification at least five (5) working days before requested inspection date. 1. Seeded areas shall be accepted provided all requirements, including maintenance, have been complied with and meadow is well established and exhibits a vigorous growing condition. 2. Areas failing to show a uniform meadow shall be reseeded at the Contractor's expense. B. Upon Final Completion, the Owner will assume maintenance. 3.8 CLEANUP AND PROTECTION: Perform cleaning during installation of the work and upon completion of the work. Remove from the site all excess materials, soil, debris, and equipment. Repair the damage resulting from seeding operations. 3.9 WARRANTY AND REPLACEMENT: All seeded areas must have a relatively uniform stand of grass or other seed mixes as specified with no bare spots over 6" square at the time of Final Completion. Reseed at the original rate and fertilize at the rates as for all blended materials. All areas failing to vigorously establish within 90 days after germination or one growing season (whichever is longest), shall be redone at the Contractor's expense. END OF SECTION 217021 B-52 MEMORIAL PARK PH2 10-23-18 MUSEUM OF FLIGHT PERMIT SUBMITTAL PLANTS SECTION 329300 - 1 PART1 GENERAL 1.1 RELATED DOCUMENTS A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section. 1.2 SUMMARY Section Includes: 1. Plants. 2. Mulch. 3. Tree stabilization. 4. Landscape edging. 5. Weed barrier fabric. B. Related sections include the following: 1. Division 31 Section "Site Clearing" for protection of existing trees and plantings, topsoil stripping and stockpiling, and site clearing. 2. Division 31 Section "Earth Moving" for excavation, filling, and rough grading and for subsurface aggregate drainage and drainage backfill materials. 3. Division 32 Section "Turf & Grasses" for sod lawn and seeding. 4. Division 32 Section "Planting Soils" for planting soils. 5. Division 33 Section "Storm Drainage". 1.3 DEFINITIONS A. Backfill: The earth used to replace or the act of replacing earth in an excavation. B. Balled and Burlapped Stock: Plants dug with firm, natural balls of earth in which they were grown, with ball size not less than diameter and depth recommended by ANSI Z60.1 for type and size of plant required; wrapped with burlap, tied, rigidly supported, and drum laced with twine with the root flare visible at the surface of the ball as recommended by ANSI Z60.1. C. Balled and Potted Stock: Plants dug with firm, natural balls of earth in which they are grown and placed, unbroken, in a container. Ball size is not less than diameter and depth recommended by ANSI Z60.1 for type and size of plant required. D. Container -Grown Stock: Healthy, vigorous, well -rooted plants grown in a container, with a well-established root system reaching sides of container and maintaining a firm ball when removed from container. Container shall be rigid enough to hold ball shape and protect root mass during shipping and be sized according to ANSI Z60.1 for type and size of plant required. E. Duff Layer: The surface layer of native topsoil that is composed of mostly decayed leaves, twigs, and detritus. F. Fabric Bag -Grown Stock: Healthy, vigorous, well -rooted plants established and grown in - ground in a porous fabric bag with well-established root system reaching sides of fabric 217021 B-52 MEMORIAL PARK PH2 10-23-18 THE MUSEUM OF FLIGHT PERMIT SUBMITTAL PLANTS SECTION 329300 - 2 bag. Fabric bag size is not Tess than diameter, depth, and volume required by ANSI Z60.1 for type and size of plant. G. Finish Grade: Elevation of finished surface, which is top of mulch for planting areas, top of planting soil for hydroseeding and seeding areas, and top of sod for sod areas. H. Manufactured Topsoil: Soil produced off-site by homogeneously blending mineral soils or sand with stabilized organic soil amendments to produce topsoil or planting soil. Pesticide: A substance or mixture intended for preventing, destroying, repelling, or mitigating a pest. This includes insecticides, miticides, herbicides, fungicides, rodenticides, and molluscicides. It also includes substances or mixtures intended for use as a plant regulator, defoliant, or desiccant. J. Pests: Living organisms that occur where they are not desired, or that cause damage to plants, animals, or people. These include insects, mites, grubs, mollusks (snails and slugs), rodents (gophers, moles, and mice), unwanted plants (weeds), fungi, bacteria, and viruses. K. Planting Area: Areas to be planted. L. Planting Soil: Standardized topsoil; existing, native surface topsoil; existing, in-place surface soil; imported topsoil; or manufactured topsoil that is modified with soil amendments and perhaps fertilizers to produce a soil mixture best for plant growth. M. Plant; Plants; Plant Material: These terms refer to vegetation in general, including trees, shrubs, vines, ground covers, ornamental grasses, bulbs, corms, tubers, or herbaceous vegetation. N. Root Flare: Also called "trunk flare." The area at the base of the plant's stem or trunk where the stem or trunk broadens to form roots; the area of transition between the root system and the stem or trunk. O. Stem Girdling Roots: Roots that encircle the stems (trunks) of trees below the soil surface. P. Subgrade: Surface or elevation of subsoil remaining after excavation is complete, or the top surface of a fill or backfill before planting soil is placed. Q. Subsoil: All soil beneath the topsoil layer of the soil profile, and typified by the lack of organic matter and soil organisms. R. Surface Soil: Soil that is present at the top layer of the existing soil profile at the Project site. In undisturbed areas, the surface soil is typically topsoil; but in disturbed areas such as urban environments, the surface soil can be subsoil. 1.4 SUBMITTALS A. Product Data: For each type of product indicated. 1. Plant Materials List: Include quantities, sizes, quality, and sources for plant materials. 2. Pesticides and Herbicides: Include product label and manufacturer's application instructions specific to the Project. 217021 B-52 MEMORIAL PARK PH2 10-23-18 THE MUSEUM OF FLIGHT PERMIT SUBMITTAL PLANTS SECTION 329300 - 3 Plant Photographs: Include color photographs in digital 3- by 5 -inch print format of each required species and size of tree material as it will be furnished to the Project. Take photographs from an angle depicting true size and condition of the typical tree to be furnished. Include a scale rod or other measuring device in each photograph. For species where more than 20 trees are required, include a minimum of two photographs showing the average tree and the best quality tree. Identify each photograph with the full scientific name of the plant, plant size, and name of the growing nursery. B. Samples for Verification: For each of the following: 1. Bark Mulch: one half cubic foot in sealed plastic bag labeled with composition of materials by percentage of weight and source of mulch. Each Sample shall be typical of the lot of material to be furnished; provide an accurate representation of color, texture, and organic makeup. 2. Weed Control Barrier: 12 by 12 inches. 3. Edging Materials and Accessories: Manufacturer's standard size, to verify color selected. C. Qualification Data: For qualified landscape Installer. Include list of similar projects completed by Installer demonstrating Installer's capabilities and experience. Include project names, addresses, and year completed, and include names and addresses of owners' contact persons. D. Product Certificates: For each type of manufactured product, from manufacturer, and complying with the following: 1. Manufacturer's certified analysis of standard products. 2. Analysis of other materials by a recognized laboratory made according to methods established by the Association of Official Analytical Chemists, where applicable. E. Maintenance Instructions: Recommended procedures to be established by Owner for maintenance of plants during a calendar year. Submit before start of required maintenance periods. F. Warranty: Sample of special warranty. 1.5 QUALITY ASSURANCE A. Installer Qualifications: A qualified landscape Installer whose work has resulted in successful establishment of plants. 1. Experience: Submit statement and outline of qualifications showing five years' experience in landscape installation and a minimum of five projects that are similar in scale and complexity in addition to requirements in Division 01 Section "Quality Requirements." 2. Installer's Field Supervision: Require Installer to maintain an experienced full-time supervisor on Project site when work is in progress. 3. Pesticide Applicator: State licensed, commercial. B. Provide quality, size, genus, species, and variety of plants indicated, complying with applicable requirements in ANSI Z60.1. C. Measurements: Measure according to ANSI Z60.1. Do not prune to obtain required sizes. 1. Trees and Shrubs: Measure with branches and trunks or canes in their normal position. Take height measurements from or near the top of the root flare for field - 217021 B-52 MEMORIAL PARK PH2 10-23-18 THE MUSEUM OF FLIGHT PERMIT SUBMITTAL PLANTS SECTION 329300 - 4 grown stock and container grown stock. Measure main body of tree or shrub for height and spread; do not measure branches or roots tip to tip. Take caliper measurements 6 inches above the root flare for trees up to 4 -inch caliper size, and 12 inches above the root flare for larger sizes. 2. Other Plants: Measure with stems, petioles, and foliage in their normal position. D. Plant Material Observation: Architect may observe plant material either at place of growth or at site before planting for compliance with requirements for genus, species, variety, cultivar, size, and quality. Architect retains right to observe trees and shrubs further for size and condition of balls and root systems, pests, disease symptoms, injuries, and latent defects and to reject unsatisfactory or defective material at any time during progress of work. Remove rejected trees or shrubs immediately from Project site. 1. Notify Architect of sources of planting materials 90 days in advance of delivery to site or 30 days prior to end of digging season whichever date comes first, no exceptions. E. Preinstallation Conference: Conduct conference at Project site. 1.6 DELIVERY, STORAGE, AND HANDLING A. Packaged Materials: Deliver packaged materials in original, unopened containers showing weight, certified analysis, name and address of manufacturer, and indiication of conformance with state and federal laws if applicable. B. Bulk Materials: 1. Do not dump or store bulk materials near structures, utilities, walkways and pavements, or on existing turf areas or plants. 2. Provide erosion -control measures to prevent erosion or displacement of bulk materials, discharge of soil -bearing water runoff, and airborne dust reaching adjacent properties, water conveyance systems, or walkways. C. Do not prune trees and shrubs before delivery. Protect bark, branches, and root systems from sun scald, drying, wind burn, sweating, whipping, and other handling and tying damage. Do not bend or bind -tie trees or shrubs in such a manner as to destroy their natural shape. Provide protective covering of plants during shipping and delivery. Do not drop plants during delivery and handling. Handle planting stock by root ball. E. Deliver plants after preparations for planting have been completed, and install immediately. If planting is delayed more than six hours after delivery, set plants and trees in their appropriate aspect (sun, filtered sun, or shade), protect from weather and mechanical damage, and keep roots moist. 1. Set balled stock on ground and cover ball with soil, peat moss, sawdust, or other acceptable material. 2. Do not remove container -grown stock from containers before time of planting. 3. Water root systems of plants stored on-site deeply and thoroughly with a fine -mist spray. Water as often as necessary to maintain root systems in a moist, but not overly -wet condition. 217021 B-52 MEMORIAL PARK PH2 10-23-18 THE MUSEUM OF FLIGHT PERMIT SUBMITTAL PLANTS SECTION 329300 - 5 1.7 PROJECT CONDITIONS A. Field Measurements: Verify actual grade elevations, service and utility locations, irrigation system components, and dimensions of plantings and construction contiguous with new plantings by field measurements before proceeding with planting work. B. Interruption of Existing Services or Utilities: Do not interrupt services or utilities to facilities occupied by Owner or others unless permitted under the following conditions and then only after arranging to provide temporary services or utilities according to requirements indicated: 1. Notify Architect no fewer than two days in advance of proposed interruption of each service or utility. 2. Do not proceed with interruption of services or utilities without Architects written permission. C. Environmental Requirements: 1. Plant or install materials during normal planting seasons for each type of planting required. 2. Planting shall not be permitted during the following conditions: a. Cold weather: less than 32° F. b. Hot weather: greater than 90° F. c. Wet weather: saturated soil. d. Windy weather: wind velocity greater than 30 m.p.h. 3. Prepare soil only when topsoil is not saturated, muddy or frozen. 1.8 SEQUENCING/SCHEDULING A. Provide the following notices to the Architect and Owner: 1. In advance of plant material delivery so that plants may be inspected upon site delivery: 5 days. 2. Before Owner is to assume maintenance responsibility: 5 days. 3. In advance of final surface preparation prior to planting operations: 5 days. 4. Before time requested for inspection for Substantial Completion: 5 days 5. Architect may choose to waive or shorten the required lead time for project reviews, at their discretion. 1.9 WARRANTY AND REPLACEMENT A. Special Warranty: Installer agrees to repair or replace plantings and accessories that fail in materials, workmanship, or growth within specified warranty period. 1. Failures include, but are not limited to, the following: a. Death and unsatisfactory growth, except for defects resulting from abuse, lack of adequate maintenance, or neglect by Owner, or incidents that are beyond Contractor's control. b. Structural failures including plantings falling or blowing over. c. Faulty performance of tree stabilization and edgings. d. Deterioration of metals, metal finishes, and other materials beyond normal weathering. 2. The warranty of plant materials will extend one year from the date of Final Completion for all work under this contract. 3. Include the following remedial actions as a minimum: a. Immediately remove dead plants and replace unless requlired to plant in the succeeding planting season. 217021 B-52 MEMORIAL PARK PH2 10-23-18 THE MUSEUM OF FLIGHT PERMIT SUBMITTAL PLANTS SECTION 329300 - 6 b. Replace plants that are more than 25 percent dead or in an unhealthy condition at end of warranty period. c. A limit of one replacement of each plant will be required except for losses or replacements due to failure to comply with requirements. d. Provide extended warranty for period equal to original warranty period, for replaced plant material. 4. Another inspection will be conducted at the end of the extended warranty period, if any, to determine acceptance or rejection. 1.10 MAINTENANCE SERVICE A. Initial Maintenance Service for Trees, Shrubs, Groundcovers and other plants: Provide maintenance by skilled employees of landscape Installer. Maintain as required in Part 3. Begin maintenance immediately after plants are installed and continue until plantings are acceptably healthy and well established but for not less than maintenance period below. 1. Maintenance Period - Initial: 90 days from date of Final Completion. PART 2 PRODUCTS 2.1 PLANT MATERIAL A. General: Furnish nursery -grown plants true to genus, species, variety, cultivar, stem form, shearing, and other features indicated in Plant Schedule or Plant Legend shown on Drawings and complying with ANSI Z60.1; and with healthy root systems developed by transplanting or root pruning. Provide well -shaped, fully branched, healthy, vigorous stock, densely foliated when in leaf and free of disease, pests, eggs, larvae, and defects such as knots, sun scald, injuries, abrasions, and disfigurement. 1. Trees with damaged, crooked, or muutiple leaders; tight vertical branches where bark is squeezed between two branches or between branch and trunk ("included bark"); crossing trunks; cut-off limbs more than 3/4 inch in diameter; or with stem girdling roots will be rejected. 2. Collected Stock: Do not use plants harvested from the wild, from native stands, from an established landscape planting, or not grown in a nursery unless otherwise indicated. B. Provide plants of sizes, grades, and ball or container sizes complying with ANSI Z60.1 for types and form of plants required. Plants of a larger size may be used if acceptable to Architect, with a proportionate increase in suze of roots or balls. C. Root -Bail Depth: Furnish trees and shrubs with root balls measured from top of root ball, which shall begin at root flare according to ANSI Z60.1. Root flare shall be visible before planting. D. Labeling: Label at least one plant of each variety, size, and caliper with a securely attached, waterproof tag bearing legible designation of common name and full scientific name, including genus and species. Include nomenclature for hybrid, variety, or cultivar, if applicable for the plant as shown on Drawings. E. If formal arrangements or consecutive order of plants is shown on Drawings, select stock for uniform height and spread, and number the labels to assure symmetry in planting. 217021 B-52 MEMORIAL PARK PH2 10-23-18 THE MUSEUM OF FLIGHT PERMIT SUBMITTAL PLANTS SECTION 329300 - 7 2.2 MULCHES A. Compost Mulch: Free from deleterious materials and suitable as a top dressing of trees and shrubs. 2.3 PESTICIDES A. General: Pesticide registered and approved by EPA, acceptable to authorities having jurisdiction, and of type recommended by manufacturer for each specific problem and as required for Project conditions and application. Do not use restricted pesticides unless authorized in writing by authorities having jurisdiction. B. Pre -Emergent Herbicide (Selective and Non -Selective): Effective for controlling the germination or growth of weeds within planted areas at the soil level directly below the mulch layer. C. Post -Emergent Herbicide (Selective and Non -Selective): Effective for controlling weed growth that has already germinated. 2.4 TREE STABILIZATION MATERIALS A. Stakes and Guys: 1. See Details (as indicated on the drawings). 2. Staking -and -Guying Devices: Stake and adjustable tie systems to secure each new planting by plant stem; sized as indicated and per manufacturer's written recommendations. a. Products: Subject to compliance with requirements, provide one of the following or approved equal: 1) Wire tie loops and polypropylene tree tie straps. 2) Heavy duty, plastic chainlock tree ties. 2.5 LANDSCAPE EDGINGS A. Steel Edging: Standard commercial -steel edging, rolled edge, fabricated in sections of standard lengths, with loops stamped from or welded to face of sections to receive stakes. 1. Basis -of -Design Product: Subject to compliance with requirements, provide one of the following or approved equal: a. "Border Guard", manufactured by Border Concepts, Charlotte, N.C., 704-541- 5509. 2. Edging Size: 3/16 inch thick by 4 inches deep. 3. Stakes: Tapered steel, a minimum of 15 inches long. 4. Accessories: Standard tapered ends, corners, and splicers. 5. Finish: Galvanized. 2.6 MISCELLANEOUS PRODUCTS A. Antidesiccant: Water -insoluble emulsion, permeable moisture retarder, film forming, for trees and shrubs. Deliver in original, sealed, and fully labeled containers and mix according to manufacturer's written instructions. B. Weed Barrier Fabric: Nonwoven Geotextile polypropylene or polyester fabric, 3 oz./sq. yd. minimum, composed of fibers formed into a stable network so that fibers retain their relative 217021 B-52 MEMORIAL PARK PH2 10-23-18 THE MUSEUM OF FLIGHT PERMIT SUBMITTAL PLANTS SECTION 329300 - 8 position. Fabric shall be inert to biological degradation and resist naturally -encountered chemicals, alkalis, and acids. PART 3 EXECUTION 3.1 EXAMINATION A. Examine areas to receive plants for compliance with requirements and conditions affecting installation and performance. 1. Verify that no foreign or deleterious material or liquid such as paint, paint washout, concrete slurry, concrete layers or chunks, cement, plaster, oils, gasoline, diesel fuel, paint thinner, turpentine, tar, roofing compound, or acid has been deposited in soil within a planting area. B. Proceed with installation only after unsatisfactory conditions have been corrected. C. If contamination by foreign or deleterious material or liquid is present in soil within a planting area, remove the soil and contamination as directed by Architect and replace with new planting soil. 3.2 PREPARATION A. Protect structures, utilities, sidewalks, pavements, and other facilities and turf areas and existing plants from damage caused by planting operations. B. Install erosion -control measures to prevent erosion or displacement of soils and discharge of soil -bearing water runoff or airborne dust to adjacent properties and walkways. Lay out individual tree and shrub locations and areas for multiple plantings. Stake locations, outline areas, adjust locations when requested, and obtain Architect's acceptance of layout before excavating or planting. Make minor adjustments as required. D. Apply antidesiccant to trees and shrubs using power spray to provide an adequate film over trunks. (before wrapping), branches, stems, twigs, and foliage to protect during digging, handling, and transportation. 1. If deciduous trees or shrubs are moved in full leaf, spray with antidesiccant at nursery before moving and again two weeks after planting. 3.3 EXCAVATION FOR TREES AND SHRUBS A. Planting Pits and Trenches: As shown on the Drawings. B. Subsoil removed from excavations may be used as planting soil only when combined with equal parts imported planting soil for use in plant pit backfill. C. Obstructions: Notify Architect if unexpected rock or obstructions detrimental to trees or shrubs are encountered in excavations. 1. Hardpan Layer: Drill 6 -inch diameter holes, 24 inches apart, into free -draining strata or to a depth of 10 feet, whichever is less, and backfill with free -draining material. 2. Drainage: Notify Architect if subsoil conditions evidence unexpected water seepage or retention in tree or shrub planting pits. Drill 6 -inch diameter holes, 24 inches apart, 217021 B-52 MEMORIAL PARK PH2 10-23-18 THE MUSEUM OF FLIGHT PERMIT SUBMITTAL PLANTS SECTION 329300 - 9 into free -draining strata or to a depth of 10 feet, whichever is less, and backfill with free -draining material. 3.4 TREE AND SHRUB PLANTING A. Before planting, verify that root flare is visible at top of root ball according to ANSI Z60.1. If root flare is not visible, remove soil in a level manner from the root ball to where the top- most root emerges from the trunk. After soil removal to expose the root flare, verify that root ball still meets size requirements. B. Remove stem girdling roots and kinked roots. Remove injured roots by cutting cleanly; do not break. C. Set trees and shrubs stock plumb and in center of planting pit or trench with root flare 2 inches above adjacent finish grades. 1. Backfill: Equal parts excavated native soil and specified imported topsoil. 2. After placing some backfill around root ball to stabilize plant, carefully cut and remove burlap, rope, and wire baskets from tops of root balls and from sides, but do not remove from under root balls. Remove pallets, if any, before setting. Do not use planting stock if root ball is cracked or broken before or during planting operation. 3. Backfill around root ball in layers, tamping to settle soil and eliminate voids and air pockets. When planting pit is approximately one-half filled, water thoroughly before placing remainder of backfill. Repeat watering until no more wafer is absorbed. 4. Place planting tablets in each planting pit when pit is approximately one-half filled; in amounts recommended in soil reports from soil -testing laboratory. Place tablets beside the root ball about 1 inch from root tips; do not place tablets in bottom of the hole. 5. Continue backfilling process. Water again after placing and tamping final layer of soil. D. When planting on slopes, set the plant so the root flare on the uphill side is flush with the surrounding soil on the slope; the edge of the root ball on the downhill side will be above the surrounding soil. Apply enough soil to cover the downhill side of the root ball. 3.5 GROUNDCOVER PLANTING A. Set out and space ground cover as shown on Drawings. B. Use imported planting soil for backfill. C. Dig holes large enough to allow spreading of roots. D. For rooted cutting plants supplied in flats, plant each in a manner that will minimally disturb the root system but to a depth not less than two nodes. E. Work soil around roots to eliminate air pockets and leave a slight saucer indentation around plants to hold water. F. Water thoroughly after planting, taking care not to cover plant crowns with wet soil. G. Protect plants from hot sun and wind; remove protection if plants show evidence of recovery from transplanting shock. 217021 B-52 MEMORIAL PARK PH2 10-23-18 THE MUSEUM OF FLIGHT PERMIT SUBMITTAL PLANTS SECTION 329300 - 10 3.6 TREE, SHRUB AND GROUNDCOVER PRUNING A. Remove only dead, dying, or broken branches. Do not prune for shape. Prune, thin, and shape trees, shrubs, and vines according to standard professional horticultural and arboricultural practices. Unless otherwise indicated by Architect, do not cut tree leaders; remove only injured, dying, or dead branches from trees and shrubs; and prune to retain natural character. C. Do not apply pruning paint to wounds. 3.7 TREE STABILIZATION/STAKING A. As shown on Drawings. 3.8 PLANTING AREA MULCHING A. Mulch backfilled surfaces of planting areas and other areas indicated within 2 days after planting. 1. Mulch in Planting Areas: Apply 2 -inch average thickness of mulch over whole surface of planting area, and finish level. Hold 1" below adjacent paved surfaces and top of planter walls. Do not place mulch within 2 -inches of trunks or stems. 3.9 EDGING INSTALLATION A. Steel Edging: Install steel edging where indicated according to manufacturer's written instructions. Anchor with steel stakes spaced per manufacturer's instructions, driven below top elevation of edging. 3.10 PLANT MAINTENANCE A. Maintain plantings by pruning, cultivating, watering, weeding, fertilizing, mulching, restoring planting saucers, adjusting and repairing tree -stabilization devices, resetting to proper grades or vertical position, and performing other operations as required to establish healthy, viable plantings. Spray or treat as required to keep trees and shrubs free of insects and disease_ B. Fill in as necessary soil subsidence that may occur because of settling or other processes. Replace mulch materials damaged or lost in areas of subsidence. C. Apply treatments as required to keep plant materials, planted areas, and soils free of pests and pathogens or disease. Use integrated pest management practices whenever possible to minimize the use of pesticides and reduce hazards. Treatments include physical controls such as hosing off foliage, mechanical controls such as traps, and biological control agents. D. Watering: Water planting areas at a minimum rate of 1 inch per week unless rainfall precipitation is adequate. 3.11 PESTICIDE APPLICATION A. Apply pesticides and other chemical products and biological control agents in accordance with authorities having jurisdiction and manufacturer's written recommendations. 217021 B-52 MEMORIAL PARK PH2 10-23-18 THE MUSEUM OF FLIGHT PERMIT SUBMITTAL PLANTS SECTION 329300 - 11 Coordinate applications with Owner's operations and others in proximity to the Work. Notify Owner before each application is performed. B. Pre -Emergent Herbicides (Selective and Non -Selective): Apply to tree, shrub, and ground - cover areas in accordance with manufacturer's written recommendations. Do not apply to seeded areas. C. Post -Emergent Herbicides (Selective and Non -Selective): Apply only as necessary to treat already -germinated weeds and in accordance with manufacturer's written recommendations. 3.12 CLEANUP AND PROTECTION A. During planting, keep adjacent paving and construction clean and work area in an orderly condition. B. Protect plants from damage due to landscape operations and operations of other contractors and trades. Maintain protection during installation and maintenance periods. Treat, repair, or replace damaged plantings. C. After installation and before Final Completion remove nursery tags, nursery stakes, tie tape, labels, wire, burlap, and other debris from plant material, planting areas, and Project site. 3.13 DISPOSAL A. Remove surplus soil and waste material including excess subsoil, unsuitable soil, trash, and debris and legally dispose of them off Owner's property. END OF SECTION 217021 B-52 MEMORIAL PARK PH2 10-23-18 THE MUSEUM OF FLIGHT PERMIT SUBMITTAL SRG SRG ARCHITECTURE, INC 621 SW MORRISON, SUITE 200 PORTLAND, OREGON 97205 503 222 1917 110 UNION SUITE 300 SEATTLE WASHINGTON 96101 206 973 1700 SRGPARTNERSHIP COM 23 July 2018 Bill Rambo Permit Technician City of Tukwila Department of Community Development 6300 Southcenter Boulevard, Suite #100 Tukwila, WA 98188 Subject: Response for Correction Letter #1 to Revision #1, and Correction Letter #2 Building Permit Application Number D18-0088 The Museum of Flight - B-52 Plaza - 9404 E Marginal Way S Dear Mr. Rambo, This letter accompanies the Building Permit Revision Submittal in response to Correction Letter #1 to Revision #1, and Correction Letter #2, both dated 10 July 2018, for The Museum of Flight's B-52 Plaza project (Permit Application Number D18-0088). This letter includes narrative responses to questions posed by the Planning department. PLANNING DEPARTMENT: 1. SRG has received a Notice of Decision, dated July 19, 2018, for the Shoreline Substantial Development permit (L18-0031), as provided by the City of Tukwila Department of Community Development. A copy of the Notice of Decision is attached for your reference. For additional reference, a copy of the Notice of Decision, dated July 17, 2018, for the Shoreline Tree Removal and Vegetation Clearing permit (L18-0030), as provided by the City of Tukwila, is also attached herein. We appreciate your continued attention to this project. Please contact me at 206-973-1685 if you have any questions. Sin erelciAlt,„\_., y, UPI Elias Gardner, Assoc. AIA SRG Partnership Cc: Clark Miller, The Museum of Flight Chris Mailander, The Museum of Flight RECEIVED CITY OF TUKWIL i; JUL 2 3 2018 PERMIT CENTER CORRECTION 41)1(6,t10`646 f � Department of Community Development - Jack Pace, Director STAFF REPORT SHORELINE SUBSTANTIAL DEVELOPMENT Allan Ekberg, Mayor 1. SUMMARY OF PROPOSED ACTION This project proposes to create a permanent exhibit of a B -52G Stratofortress 59-2584 Midnight Express aircraft and a Veteran's Memorial Plaza in a park -like setting. The project site is not adjacent to the Duwamish River but a significant portion of the project lies within 200 feet of the Ordinary High Water Mark (OHWM) of the river. 2. GENERAL INFORMATION Project: File Number: Applicant: Location: Associated Applications/ Permits: Museum of Flight's B-52 Memorial Park, Phase 2 L18-0031: Shoreline Substantial Development Permit Elias Gardner, SRG Partnership, Inc. 9229 E. Marginal Way South, Tukwila King County Parcel #5729800010 RECEIVED CITY OF TUKWILA JUL 2 3 2018 PERMIT CENTER E16-0001 SEPA L18-0030 Shoreline Tree Removal and Vegetation Clearing Permit D18-0088 Development Permit Comprehensive Plan/ Zoning Designation: Manufacturing Industrial Center/Heavy Industrial (MIC/H) SEPA Determination: Staff Contact: Lynn Miranda, Senior Planner Attachments: 1. Geotechnical Engineering Report prepared by GeoEngineers and dated February 5, 2016. 2. Report Addendum to Geotechnical Report prepared by GeoEngineers and dated May 15, 2018. 3. Stormwater Technical Information Report prepared by Magnusson Klemencic and dated March 26, 2018. 4. No Net Loss Checklist submitted April 9, 2018. 5. Letter from Stanley Jaworowski to DCD RE: Shoreline Tree Removal and Vegetation Clearing Permit for B-52 Memorial Park and Vietnam Veteran's Memorial and dated April 9, 2018. 6. Comment Letter from WA Dept. of Archaeology and Historic Preservation, dated May 1)01(6/00(6iC Approval as a Planned Action on March 10, 2016 (E16-0001) ORRE TION LTR# 1 Shoreline Substantial Developm' July 19, 2018 24, 2018. 7. Memo from Stan Jaworoski to Lynn Miranda RE: L18-0031 Shoreline Substantial Development for B-52 Memorial Park and dated May 30, 2018, addressing the project's consistency with applicable Shoreline Master Plan goals and policies. 8. Cultural Resource Assessment for the B-52 Memorial Park prepared by Anchor QEA, dated lune 2018. 9. Response letter from WA Dept. of Archaeology and Historic Preservation, dated July 12, 2018. 3. PROJECT DESCRIPTION This project proposes to create a permanent exhibit of a B -52G Stratofortress 59-2584 Midnight Express aircraft and a Veteran's Memorial Plaza in a park -like setting which will be open to the public as part of the Museum of Flight. On-site work includes constructing deep foundations for two tie -downs (a total of eight 18 -inch diameter auger -cast pilings) to support the B-52 aircraft, a 650 square -foot rain garden, landscaping, walkways of permeable pavement, and a plaza. The plaza will consist of a low seating wall, a statue depicting a returning aviator honoring veterans, 7 flag poles, educational exhibits, and lighting (see Figure 1). Due to direct conflicts with the proposed B-52 wing location, 13 existing trees along the south property line will be removed, requiring 80 replacement trees in conformance with TMC 18.44.080.B. 23 replacement trees will be planted on-site and in -lieu fees for the remaining 57 trees will be paid into the City's tree replacement fund. Project Site The project site is part of a larger parcel located at 9229 E. Marginal Way South (Parcel #5729800010) and outlined in red in the Figure 2 below. Paved parking areas for Aviation High School and adjacent office uses surround the project site on the north and east sides. Aviation High School and the Museum of Flight's Aviation Pavilion are situated nearby, east of the project site. The site is separated from Slip 6 of the Duwamish River on the south side by a strip of land approximately 25 feet wide owned by the Boeing Company. The site has no direct access t& tRiver. There is an existing King County storm drain easement running diagonal on the site ?tom the southwest towards the northeast. Remaining on-site are three trailers currently accommodating the ongoing operations and activities of the Boeing Employees Amateur Radio Society (B.E.A.R.S.). The trailers house sensitive communication antennae and equipment, and provide emergency communication services for Boeing and: the local public service communities. The site is relatively flat and consists of exposed soil) across much of the site and some crushed gravel. The Museum has undertaken clean-up actions on the site over the past 10 years and it was found to be successfully remediated of hazardous materials per the Environmental Protection Agency in 2017. Existing trees on the site include 13 tall, mature trees along the 2 Shoreline Substantial Development July 19, 2018 i �/ southern property line, including 11 Lombardi poplars and 2 native Bitter cherries. Figure 1. Site Plan 1 4/ 41 . . - I!AH. Rain Garden 3 B-52 Aircraft I Existing BEARS trailers to remain Permeable paving Vietnam 0.77.Veteran's Memorial .. Plaza Shoreline Substantial Developmr *. July 19, 2018 Slip 6 Duwamish River Figure 2. Project Location Aviation High School 4. TUKWILA SHORELINE MASTER PROGRAM Museum of Flight Aviation Pavilion The City of Tukwila adopted a new Shoreline Master Program (SMP) on August 15, 2011 which was approved by the Washington State Department of Ecology on October 14, 2011 and became effective October 28, 2011. This project is subject to the new Shoreline Master Program. A. SHORELINE ENVIRONMENT DESIGNATION The shoreline environment designation for the site its High Intensity; the purpose of the High Intensity environment is to focus on water -oriented commercial, transportation, and industrial uses, with a priority on water -dependent uses. Non -water oriented uses should not be allowed except as part of a mixed use development, in limited situations where they would not conflict with or limit opportunities for water -oriented uses, or on sites where there is no direct access to the shoreline. New development should promote vegetation conservation and enhancement, sensitive areas protection, and preservation of water quality to assure no net loss of shoreline ecological functions. Visual and public access should be provided, where feasible. The shoreline buffer in the High Intensity environment is measured as 100 feet from the OHWM of the Duwamish River. A portion of the B-52 Memorial Park project, including one support structure for the B-52 aircraft landing gear, a rain garden, landscaping, and walkways of permeable pavement fall within the 100 foot shor&ine buffer. Other project elements, including the two deep foundations for two tie -downs (a total of eight 18 -inch diameter auger - cast pilings) for the aircraft and the half of the park plaza, lie outside the buffer but within the 4 Shoreline Substantial Development July 19, 2018 7 200 foot shoreline jurisdiction. There is a small portion of the site that is located completely outside of the shoreline environment — see Figure 3. 200' from OHWM 100' from OHWM Figure 3. Shoreline Buffers r ,."A 1 ,�+.r r i •4 1 ti 1 R• t t i r. t 1 B. SHORELINE MASTER PROGRAM GOALS AND POLICIES The following section discusses the Shoreline Master Program (SMP) goals and policies that apply to this project and are excerpted from Chapter 6 of the City's SMP. 6.3 Land Development Use and Economic Vitality Goal: Development along the shoreline that fosters the economic vitality of Tukwila while preserving the long-term benefits of the river. Policy 5.3.8: Ensure that non -water dependent shoreline development in the MIC provides for shoreline multiple uses to the extent that site security and the success of industrial operations are not jeopardized; ensures no net loss of shoreline function and provides adequate mitigation for the loss of shoreline multiple use opportunities. Applicant Response: The Museum of Flight (MOF) 8-52 Park is an extension of the Museum of Flight Air Pavilion, and the greater Museum complex. The MOF draws over half a million visitors 5 Shoreline Substantial Developm' July 19, 2018 per year and employs nearly 200 people. The B-52 Park will add an additional exhibit of a restored B -52G, while maintaining visual access to the river and an ecologically restored park area for visitors to enjoy. The applicant feels this use meets the goals for both economic vitality and preserving the benefits of the river. The B-52 project site is within the shoreline buffer but is separated from the actual high-water line by a 25' strip of land owned by the Boeing Company so that there is no direct access to the river from the project site. Shoreline access is controlled by the Boeing Company. The applicant believes that the development of the B-52 park provides flexibility for future development or shoreline function in that it has no permanent structures other than footings for the aircraft in the shoreline buffer area. Staff concurs with the applicant's response. The applicant has also provided a No Net Loss (NNL) checklist which is provided as Attachment 4 to this staff report. A NNL analysis of shoreline function was not required of the applicant, as the applicant is improving the existing soil, water, and shoreline jurisdictions conditions. Prior to the improvements, the site consisted of compacted gravel paving. Park improvements will include landscaping, a rain garden, and permeable paving, resulting in better soil stabilization, improved runoff water quality, and enhanced habitat for wildlife. 6.6 Access and Recreational Use Goal: Increase the amount and diversity of opportunities for public recreation and access to and along the river, including visual and cultural access, access to the water's edge, opportunities for small boat navigation and access, and connections to other neighborhoods, consistent with the shoreline character. Applicant Response: The B-52 project site is within the shoreline buffer, but is separated from the actual high-water line by a 25 foot strip of land owned by the Boeing Company so that there is no direct access to the river from the project site. However, the applicant is creating a park space that will be open to the public with many recreational amenities, including a loop path around the aircraft and a memorial plaza located on a raised mound surrounded by lawn from which one can view to the river. Staff concurs with the applicant's response. Policy 5.6.14: For MIC properties not included in the King County Green River Trail Plan, require shoreline development to provide public access or a private natural area in lieu of public access, or otherwise mitigate the loss of public access. Applicant Response: The B-52 project is providing nearly an acre of open space with a native meadow planting, raingarden, loop path and memorial plaza. Because the project site is not directly adjacent to the river and is very flat, views from the southwest corner nearest the high- water line are not very clear. Therefore, the plaza area will be raised to allow for views to the 6 Shoreline Substantial Development July 19, 2018 f river. The plaza and paths all meet ADA requirements, and furnishings including benches, handrails, and site lighting are provided. The park plantings are native/adaptive in accordance with Vegetation Protection and Landscaping section of the Tukwila Shoreline Master Program, and any tree removal is being either replaced or paid for by the Museum in lieu of planting additional trees, based on the restrictions inherent in our program. Staff concurs with the applicant's response. The project site is not included in the King County Green River Trail Plan. Policy 5.10.1: Design, locate, and manage shoreline development including streets, flood control projects, surface water drainage and sewer systems, clearing and grading activities, and landscaping in a manner which minimizes opportunities for pollutants to enter the river, provides erosion control and otherwise protects water quality. Applicant Response: Minimal grading will occur on the site. The former compacted gravel parking area was de -compacted and replaced with hydroseeded meadow as part of the first phase of this project, which has been completed. Next phases will enhance the meadow and add additional planting and permeable paving. At the low point of the site where water currently pools, a rain garden will be added to increase infiltration and filter any pollutants that may be carried with runoff across the site. Staff concurs with the applicant's response. 5. SHORELINE REGULATIONS TMC 18.44.130.8.3. Shoreline Administration states that a substantial development permit shall be granted only when the development proposed is consistent with the shoreline master program. The relevant SMP policies were discussed above. Below is a discussion of the relevant shoreline master program regulations that are incorporated into the zoning code that apply to this permit application. A. Permitted Uses: TMC 18.44.060 identifies permitted uses in the High Intensity environment. Under TMC 18.44.060.6.1 the following components of the proposed project are listed as permitted uses in the High Intensity buffer (100 feet from OHWM): c. Public parks, recreation and open space. d. Public and/or private promenades, footpaths or trails. f. Recreation structures such as benches, tables, viewpoints, and picnic shelters, provided no such structure shall exceed 15 feet in height and 25 square feet in area and no views of the shoreline are blocked from adjacent properties. Project elements within the High Intensity buffer consist of one support structure for the 6-52 aircraft landing gear, a rain garden, landscaping, and walkways of permeable pavement. 7 Shoreline Substantial Developmr -* July 19, 2018 TMC 18.44.060.C.1 sets forth the permitted uses in the High Intensity environment area located outside of the buffer (within 200 feet of the OHWM): "All uses permitted in the High Intensity Buffer and/or the Shoreline Use Matrix may be allowed." Project elements within this area are considered permitted uses, consisting of two deep foundations for two tie -downs (a total of eight 18 -inch diameter auger -cast pilings) to support the B-52 aircraft, landscaping, walkways of permeable pavement, and a plaza. The plaza will consist of a low seating wall, a statue depicting a returning aviator honoring veterans, 2 of the 7 flag poles, educational exhibits, and lighting. B. Development Standards - TMC 18.44.070.0 The following development standards apply to this project. • TMC 18.44.070.C.1 Standards — The proposed project meets the development standards for the underlying Manufacturing industrial Center/Heavy Industrial (MIC/H) zone. • TMC 18.44.070.C.2. Setbacks and site configuration - The yard setback adjacent to the river is 100 feet. The one structure proposed within the buffer is an undercarriage support for the aircraft's wingtip which will be 8 feet in height and is a permitted use within this area. • TMC 18.44.070.C.3. Height restrictions - The project does not exceed the maximum height limitation of 15 feet in within the River Buffer area or 45 outside the river buffer but within the shoreline jurisdiction. The maximum height of the fuselage or main body of the 8-52 plane, when mounted, is anticipated to be 17 feet 11 inches above grade. The top of the vertical tail fin is anticipated to be 42 feet 1 inch above grade. The project structures will not block the views of the river for any residents. • TMC 18.44.070.C.4 Lighting — Two lighting fixtures mounted on 25 foot -tall poles will illuminate the site and be designed to limit spillover and glare on the property to the south where Slip 6 of the Duwamish River is located. Three uplights will illuminate the statue and flag pole base. Additional illumination of the pathways internal to the site is not provided, as the site is not intended to be used after dark or after Museum operating hours. C. Surface Water and Water Quality - TMC 18.44.070.D The project meets the requirements of this section, including incorporating low impact development techniques such as a rain garden and permeable pavement for the pedestrian pathways, and significant amounts of landscaping. D. Archaeological, Cultural and Historic Resources - TMC 18.44. 070.G A Cultural Resource Assessment was prepared for the project site prior to construction of the project and shared with the WA Department of Archaeology and Historic Preservation (DAHP). See Attachments 6 and 8 for their comment letters. The project will be conditioned to ensure the provisions of TMC 18.44.070.G are met. See Section 6 — Public Comments below for more discussion. 8 Shoreline Substantial Development July 19, 2018 l " E. Environmental Impact Mitigation - TMC 18.44.070.H All shoreline development and uses will occur in a manner that results in no net loss of shoreline ecological functions through the careful location and design of all allowed development and uses. An Environmental Checklist was submitted for the B-52 Memorial Park Phase 1 and 2 (E16-0001) and a Notice of Decision was issued approving the proposal as a Planned Action on March 10, 2016. a. Avoiding the impact altogether by not taking a certain action or parts of an action. The project site is not adjacent to the Green River. The site is separated from Slip 6 on the Green River by approximately 25 feet of property owned by Boeing. The project avoids construction on the riverbank and underwater. b. Minimizing impacts by limiting the degree or magnitude of the action and its implementation by using appropriate technology or by taking affirmative steps to avoid or reduce impacts. • 13 trees will be removed on-site due to disease and site layout constrictions, and per TMC 18.44.080.B, 80 replacement trees are required. A minimum of 23 trees will be planted on site by the applicant and payment into the City's tree fund is allowed for up to 57 of the replacement trees. A tree adjacent to the site will be retained and protected during construction. • Low Impact Developments (LID), including a rain garden and pathways of permeable pavement will be incorporated in the proposed project to address runoff. • Landscaping, including native vegetation, will replace the former paving and compacted soil and gravel surfacing. • All pollution -generating impervious surface area within the site disturbance area was removed as part of previous work on the site in 2016. • Park lighting will be directed away from the river to prevent spillover. c. Rectifying the impact by repairing, rehabilitating, or restoring the affected environment. d. Reducing or eliminating the impact over time by preservation and maintenance operations. e. Compensating for the impact by replacing, enhancing, or providing substitute resources or environments. f. Monitoring the impact and the compensation projects and taking appropriate corrective measures. Impacts to vegetation in the shoreline jurisdiction will be addressed by increasing the amount of trees on the site. A Shoreline Tree Removal and Vegetation Clearing permit to remove 13 existing trees within the shoreline environment was approved on July 17, 2018. Per TMC 18.44.080.B, 80 replacement trees are required, which was determined based on the number and size of trees removed. The applicant will plant a minimum of 23 of the required replacement trees on site. The applicant will also pay a fee in lieu into the City's tree replacement fund for each of the remaining 57 trees which are not able to be planted on site due to King County easement restrictions and the design intent and the operational requirements of the project. An existing tree located close to the park on the 9 Shoreline Substantial Developmr +' July 19, 2018 adjacent parcel to the south will be retained and its critical root zone protected during construction. F. Signs - TMC 18.44. 070.L Signs within the shoreline jurisdiction will be limited to interpretive signs. G. Vegetation Protection and Landscaping - TMC 18.44.080 A total of 13 trees will be removed within the shoreline jurisdiction along the southern border of the proposed 3-52 Bomber Memorial Park site when this project is implemented. The subject trees include 11 Lombardi poplars and two native Bitter cherries,ranging from 25 feet to 85 feet in height and 8 to 26 inches in diameter at 4.5 feet from the ground. Three trees were previously topped at 35 feet, and two trees are diseased and considered not viable. Per TMC 18.44.080.B, 80 native trees are required as replacement, which was determined based on the number and size of trees removed. The applicant is proposing planting 23 of the required replacement trees on site and paying a fee in lieu into the City's tree replacement fund for each of the remaining 57 trees. A number of alternatives were considered to increase the proposed number of replacement trees planted on site, including adding trees to the eastern portion of the site, screening the B.E.A.R.S. trailers on the south side of the property, adding trees in large planters along the King County stormwater easement that could be moved, if needed, and planting trees off-site adjacent to Slip 6. The applicant believed placing more trees on the site was not feasible due to the following reasons: • Planting more trees on the eastern border of the site conflicted with project goals of maintaining visibility of the military branch flags, sculpture, and the aircraft from surrounding vantage points. • Operational requirements of the site, including King County's requirement to keep access to a storm drain manhole along the western portion of the site free of trees. • At the south side of the project site, the Museum of Flight has long accommodated the ongoing operations and activities of the Boeing Employees Amateur Radio Society (B.E.A.R.S.). The trailers here house sensitive communication antennae and equipment, and provide emergency communication services for Boeing and the local public service communities. Existing trees are being removed from this area in order to limit the potential for damage or interference with B.E.A.R.S. operations. • Trees in planters have a low survival rate and have limited mobility. • Given the known soil conditions on the project site, it is speculated that adjacent properties may likely contain contamination, unstable soils, or invasive existing plantings, suggesting that a more intrusive soils investigation, tree survey, and planting study could ensue. The Boeing parcels adjacent to the project site and to Slip 6 (King County Parcel Nos. 562420-1038 and 562420-1032) are further understood to be high - security facilities, and the applicant believes coordination of existing conditions investigations and tree plantings at Slip 6 to be operationally prohibitive. 10 Shoreline Substantias Development July 19, 2018 l " On-site trees to be removed The 23 replacement trees to be planted on-site include a native mix of Western Red Cedar, Cascara, Shore Pine, and Oregon Ash. An existing tree located close to the park on the adjacent parcel to the south will be retained and its critical root zone protected during construction per TMC 18.54.070.1-11. Tree removal and replacement was approved in a Notice of Decision issued on July 17, 2018. Landscape maintenance will occur as needed for successful establishment of the plantings. The applicant will need to submit annual photos of all 23 trees to the City's Urban Environmentalist to ensure proper maintenance and a 100% survival rate for three years following the initial landscape inspection. Per TMC 18.44.080.B.5, the property owner is required to ensure the viability and long-term health of trees planted for replacement through proper care and maintenance for the life of the project. Replaced trees that do not survive must be replanted in the next appropriate season for planting. H. Public Access - TMC 18.44.100 Public access is not required for this project as the site does not abut the Duwamish River shoreline. However, the 8-52 park project is providing nearly an acre of open space with a loop path and memorial plaza. The plaza will be raised to allow for views to the river. The plaza and paths all meet ADA requirements, and furnishings including benches, handrails, and site lighting are provided. L Shoreline Design Guidelines - TMC 18.44.110 1. Relationship of Structure to Site. 2. Building Design. These sections of the TMC do not apply as no buildings are being constructed, only the 11 Shoreline Substantial ()evelopnn- } July 19, 2018 support structures for the B-52 aircraft. 3. Design of Public Access. The project is consistent with the public access design guidelines. An attractively designed and welcoming park will provide visual access to the Duwamish River and nearly an acre of open space with a loop trail to view the B-52 plane and the surrounding area. Site landscaping will consist of native vegetation, consistent with TMC 18.44.080. Durable seating is provided via a low seating wall around the memorial plaza and four benches of metal and wood. Environmentally friendly porous pavement is used on the pedestrian pathways. 6. PUBLIC COMMENTS Comments were received during the Notice of Application period from Gretchen Kaehler of the Washington Department of Archaeology and Historic Preservation on May 24, 2018 (see Attachment 6). Ms. Kaehler notified staff that the project area has a high potential to contain archaeological resources due to the site's location on an old Oxbow Bend of the Duwamish River and proximity to four recorded precontact archaeological sites within 1 mile of the project. She requested that a professional archaeological survey of the project area prior to ground disturbance be conducted to ensure that protected resources would not be inadvertently damaged during construction. Response: A Cultural Resource Assessment was conducted in response to comments from DAHP and submitted to the City, DAHP, King County, and the Muckleshoot, Snoqualmie, Suquamish, and Tulalip tribes on June 26, 2018. The assessment included background research using sources such as geotechnical reports, public records, and historic maps and resources to develop a full of the history of land use and archaeological potential in the project area. The conclusions and recommendations of the Cultural Resource Assessment include the following: "Parcel history, geotechnical borings, and nearby monitoring indicate that at least 4 to 7 feet of recent fill, and possibly more, are present in the study area. Groundwater is likely present at around 10 feet, representing a likely lower boundary of occupation or use. Native sediments could be present between 4 and 10 feet below the surface. Archaeological potential, however, is low to moderate. The native ground surface may have been removed by the cleanup, if not by prior industrial activity. However, the presence of historical artifacts at 12 feet below the surface on the adjacent parcel indicates that some potential remains. The footprint of ground disturbance deeper than 4 feet below the surface is limited to the eight auger -cast piles that form the foundation for the two tie - downs for the project. If possible, given construction methods, archaeological monitoring should occur at those locations, to comply with TMC 18.50.110. An archaeological monitoring plan should be developed and provided to DAHP and interested Native American Tribes. An Inadvertent Discovery Plan should also be 12 Shoreline Substantial Development July 19, 2018 r / developed, to guide actions in the event that archaeological materials are encountered when the monitor is not on site." DAHP staff submitted a follow-up letter dated July 12, 2018 (See Attachment 8) to the City stating they have reviewed the report and concur with the recommendation that ground disturbance for the project be monitored by a professional archaeologist under an archaeological monitoring and inadvertent discovery plan (MDIP) reviewed by DAHP and the Tribes. DAHP also requested that an MDIP be prepared and submitted to DAHP and the Tribes for review prior to ground disturbance and monitoring. The Assessment report's and DAHP recommendations will be included as a condition of approval of this permit. 7. SEPA AND OTHER CITY APPROVALS An Environmental Checklist was submitted for the B-52 Memorial Park proposal (E16-0001) and a Notice of Decision was issued approving the proposal as a SEPA Planned Action on March 10, 2016. A Shoreline Tree Removal and Vegetation Clearing permit (L18-0030) was approved for this project on July 17, 2018. The applicant must obtain a building permit for park structures. 8. RECOMMENDATION Approval of the shoreline substantial development permit with the following condition: 1. Per the conclusions and recommendations of the Cultural Resource Assessment conducted for this project, the following actions are required: a. Develop and distribute an archaeological monitoring plan to DAHP and interested Native American Tribes prior to ground disturbance and monitoring. b. A professional archaeologist who meets the Secretary of the Interior standards for Professional Archaeology shall be on site to monitor excavation and placement of the eight auger -cast piles that form the foundation for the two tie -downs. c. Develop an Inadvertent Discovery Plan to guide actions in the event that archaeological materials are discovered when the monitor is not on site. 13 1 City of Tukwila Allan Ekberg, Mayor Department of Community Development - Jack Pace, Director July 17, 2018 STAFF REPORT AND NOTICE OF DECISION TO: Elias Gardner, Applicant, SRG Washington State Department of Ecology Washington State Department of Fish and Wildlife King County Department of Assessments This letter serves as a Notice of Decision and is issued pursuant to TMC 18.104.170 on the following project and permit approval. I. PROJECT INFORMATION Project File Number: L18-0030 Applicant: Elias Gardner, SRG Partnership, Inc. Type of Permit Applied for: Shoreline Tree Removal and Vegetation Clearing Project Description: Proposal is to remove and replace 13 trees within the shoreline jurisdiction on the proposed B-52 Memorial Park site. Location: King County Parcel # 5729800010 Associated Files: L18-0031 Shoreline Substantial Development Comprehensive Plan Designation/Zoning District: RECEIVED Manufacturing Industrial Center/Heavy Industrial {MIC/Kf ITY OF TU K W I LA II. DECISION JUL 2 3 2018 PERMIT CENTER SEPA Determination: An Environmental Checklist was submitted for the B-52 Memorial Park proposal ([16- 0001) and a Notice of Decision was issued approving the proposal as a Planned Action on March 10, 2016. Decision on Substantive Permit: The Community Development Director has determined that the special permission application does comply with applicable City and State code requirements and has approved that application, subject to the following conditions: 1 0RRE 0+x'4 �_TR# .�. t4- 00W6' 1. Applicant shall plant at least 23 of the required 80 replacement trees on-site per approved plans. Payment into the City's Tree Fund is allowed for up to 57 replacement trees. At the time of this writing, the fee per replacement tree is $124.00; this fee is subject to change. At the time of initial planting inspection associated with the building permit, payment into the City's Tree Fund will be at the rate codified/in place at the time of inspection. 2. Trees may be planted between October 15th and April 15th; this ensures the best start for tree health and retention for the mitigation monitoring period and beyond. Trees shall be planted after construction of the B-5 Park, as construction equipment has the potential to damage newly planted trees. 3. Trees should be watered weekly during the dry months (generally July -September or as necessary depending on conditions) for the first two growing seasons or until the plants are established. 4. Applicant shall submit annual photos of all 23 replacement trees to the City's Urban Environmentalist (_1. c'ra um'r r, a t.,nvid'iaw.1 guv) to ensure proper maintenance and a 100% survival rate for three years following the initial landscape inspection. 5. Per TMC 18.44.080.B.5, the property owner is required to ensure the viability and long-term health of trees planted for replacement through proper care and maintenance for the life of the project. Replaced trees that do not survive must be replanted in the next appropriate season for planting. 6. Topping of trees is prohibited (unless absolutely necessary to protect utility lines) and will be regulated as removal requiring tree replacement. 7. Contact the City's Urban Environmentalist (A^dreg . "m n u'tjAia nd F.,) for a post -construction inspection of protected trees. All corrective or reparative pruning must be conducted by a Qualified Tree Professional. III. FINDINGS This tree clearing permit application is to remove 13 trees within the shoreline jurisdiction along the southern border of the proposed B-52 Bomber Memorial Park site. The subject trees include 11 Lombardi poplars and two native Bitter cherries, ranging from 25 feet to 85 feet in height and 8 to 26 inches in diameter at 4.5 feet from the ground. Three trees were previously topped at 35 feet, and two trees are diseased and considered not viable. Per TMC 18.44.080.B, 80 replacement trees are required, which was determined based on the number and size of trees removed. The applicant is proposing planting 23 of the required replacement trees on site. Several options were considered to increase the number of replacement trees planted on site, including adding trees to the eastern portion of the site, screening the trailers on the south side of the property, or adding trees in Targe planters that could be moved, if needed. Per the applicant, these options conflicted with project goals of maintaining visibility of the military branch flags, sculpture, and the aircraft, as well as operational requirements of the site. The trees to be planted on site include a native mix of Western Red Cedar, Cascara, Shore Pine, and Oregon Ash. An irrigation system is included to ensure the viability and long-term health of the replacement trees. An existing tree located close to the park on the adjacent parcel to the south will be retained and its critical root zone protected during construction. Payment into the City's Tree Fund is allowed for up to 57 replacement trees. At the time of this writing, the fee per replacement tree is $124.00; this fee is subject to change. At the time of initial planting inspection associated with the building permit, payment into the City's Tree Fund will be required at the rate codified/in place at the time of inspection. ;:iti? 00) F� € .4.1 2 r 1 IV. YOUR APPEAL RIGHTS The Decision on this Permit Application is a Type 2 decision pursuant to Tukwila Municipal Code §18.104.010. Other land use applications related to this project may still be pending. One administrative appeal to the Hearing Examiner of the Decision on the Permit itself is permitted. A party who is not satisfied with the outcome of the Hearing Examiner appeal process may file an appeal in King County Superior Court from the Hearing Examiner's decision. IV. PROCEDURES AND TIME FOR APPEALING In order to appeal the Community Development Director's decision on the Permit Application, a written notice of appeal must be filed with the Department of Community Development within 14 -days of the issuance of this Decision, that is by July 31, 2018. The requirements for such appeals are set forth in Tukwila Municipal Code 18.116. All appeal materials shall be submitted to the Department of Community Development. Appeal materials MUST include: 1. The name of the appealing party. 2. The address and phone number of the appealing party; and if the appealing party is a corporation, association or other group, the address and phone number of a contact person authorized to receive notices on the appealing party's behalf. 3. A statement identifying the decision being appealed and the alleged errors in the decision, including any specific challenge to an MDNS. 4. The Notice of Appeal shall identify (a) the specific errors of fact or errors in application of the law in the decision being appealed; (b) the harm suffered or anticipated by the appellant, and (c) the relief sought. The scope of an appeal shall be limited to matters or issues raised in the Notice of Appeal. 5. Appeal fee per the current fee schedule, additional hourly charges may apply. In addition, all hearing examiner costs will be passed through to the appellant. V. APPEAL HEARINGS PROCESS Any administrative appeal regarding the Permit shall be conducted as an open record hearing before the Hearing Examiner based on the testimony and documentary evidence presented at the open record hearing. The Hearing Examiner decision on the appeal is the City's final decision. Any party wishing to challenge the Hearing Examiner decision on this application must file an appeal pursuant to the procedures and time limitations set forth in RCW 36.70C. An appeal challenging a DNS, an MDNS or an EIS may be included in such an appeal. If no appeal of the Hearing Examiner decision is properly filed in Superior Court within such time limit, the Decision on this permit will be final. The City's decision to issue a DNS, an MDNS or an EIS is final for this permit and any other pending permit applications for the development of the subject property. 3 VI. INSPECTION OF INFORMATI ON ON THE APPLICATION Project materials including the application, any staff reports, and other studies related to the permits are available for inspection at the Tukwila Department of Community Development, 6300 Southcenter Blvd., Suite 100, Tukwila, Washington 98188 from Monday through Friday between 8:30 a.m. and 5:00 p.m. The project planner is Lynn Miranda, who may be contacted at 206.433.7162 for further information. Property owners affected by this decision may request a change in valuation for their property tax purposes. Contact the King County Assessor's Office for further information regarding property tax valuation changes. The notice board must be removed at the expiration of the appeal period if no appeal is filed. • v Jack lace, Director Department of Community Development City of Tukwila 4 SRG SRG ARCHITECTURE, INC 621 SW MORRISON, SUITE 200 PORTLAND, OREGON 97205 503 222 1917 110 UNION SUITE 300 SEATTLE WASHINGTON 96101 20b 973 1700 SRGPARTNERSHIP COM l 23 July 2018 Bill Rambo Permit Technician City of Tukwila Department of Community Development 6300 Southcenter Boulevard, Suite #100 Tukwila, WA 98188 Subject: Response for Correction Letter #1 to Revision #1, and Correction Letter #2 Building Permit Application Number D18-0088 The Museum of Flight - B-52 Plaza - 9404 E Marginal Way S Dear Mr. Rambo, This letter accompanies the Building Permit Revision Submittal in response to Correction Letter #1 to Revision #1, and Correction Letter #2, both dated 10 July 2018, for The Museum of Flight's B-52 Plaza project (Permit Application Number 018-0088). This letter includes narrative responses to questions posed by the Planning department. PLANNING DEPARTMENT: 1. SRG has received a Notice of Decision, dated July 19, 2018, for the Shoreline Substantial Development permit (L18-0031), as provided by the City of Tukwila Department of Community Development. A copy of the Notice of Decision is attached for your reference. 2. For additional reference, a copy of the Notice of Decision, dated July 17, 2018, for the Shoreline Tree Removal and Vegetation Clearing permit (L18-0030), as provided by the City of Tukwila, is also attached herein. We appreciate your continued attention to this project. Please contact me at 206-973-1685 if you have any questions. Sinc rely, Elias Gardner, Assoc. AIA SRG Partnership Cc: Clark Miller, The Museum of Flight Chris Mailander, The Museum of Flight RECEIVED CITY OF TUKWILA JUL 2 3 2018 PERMIT CENTER t:\SS 00X`6 JARECTJON ;R# REVISION Hai_ Department of Community Development - Jack Pace, Director STAFF REPORT SHORELINE SUBSTANTIAL DEVELOPMENT Allan Ekberg, Mayor 1. SUMMARY OF PROPOSED ACTION This project proposes to create a permanent exhibit of a B -52G Stratofortress 59-2584 Midnight Express aircraft and a Veteran's Memorial Plaza in a park -like setting. The project site is not adjacent to the Duwamish River but a significant portion of the project lies within 200 feet of the Ordinary High Water Mark (OHWM) of the river. 2. GENERAL INFORMATION Project: File Number: Applicant: Location: Associated Applications/ Permits: Comprehensive Plan/ Zoning Designation: SEPA Determination: Staff Contact: Attachments: Museum of Flight's B-52 Memorial Park, Phase 2 L18-0031: Shoreline Substantial Development Permit Elias Gardner, SRG Partnership, Inc. 9229 E. Marginal Way South, Tukwila King County Parcel #5729800010 RECEIVED CITY OF TI.1 K\ i JUL 2 3 4V � 1 Pi n ia; 1 E16-0001 SEPA L18-0030 Shoreline Tree Removal and Vegetation Clearing Permit D18-0088 Development Permit Manufacturing Industrial Center/Heavy Industrial (MIC/H) Approval as a Planned Action on March 10, 2016 (E16-0001) CORREcTION LTR# Lynn Miranda, Senior Planner 1. Geotechnical Engineering Report prepared by GeoEngineers and dated February 5, 2016. 2. Report Addendum to Geotechnical Report prepared by GeoEngineers and dated May 15, 2018. 3. Stormwater Technical Information Report prepared by Magnusson Klemencic and dated March 26, 2018. 4. No Net Loss Checklist submitted April 9, 2018. REVISION N0. 5. Letter from Stanley Jaworowski to DCD RE: Shoreline Tree Removal and Vegetation Clearing Permit for B-52 Memorial Park and Vietnam Veteran's Memorial and dated April 9, 2018. 6. Comment Letter from WA Dept. of Archaeology and Historic Preservation, dated May 1 t)r�1 005 Shoreline Substantial Development July 19, 2018 24, 2018. 7. Memo from Stan Jaworoski to Lynn Miranda RE: L18-0031 Shoreline Substantial Development for B-52 Memorial Park and dated May 30, 2018, addressing the project's consistency with applicable Shoreline Master Plan goals and policies. 8. Cultural Resource Assessment for the B-52 Memorial Park prepared by Anchor QEA, dated June 2018. 9. Response letter from WA Dept. of Archaeology and Historic Preservation, dated July 12, 2018. 3. PROJECT DESCRIPTION This project proposes to create a permanent exhibit of a B -52G Stratofortress 59-2584 Midnight Express aircraft and a Veteran's Memorial Plaza in a park -like setting which will be open to the public as part of the Museum of Flight. On-site work includes constructing deep foundations for two tie -downs (a total of eight 18 -inch diameter auger -cast pilings) to support the B-52 aircraft, a 650 square -foot rain garden, landscaping, walkways of permeable pavement, and a plaza. The plaza will consist of a low seating wall, a statue depicting a returning aviator honoring veterans, 7 flag poles, educational exhibits, and lighting (see Figure 1). Due to direct conflicts with the proposed B-52 wing location, 13 existing trees along the south property line will be removed, requiring 80 replacement trees in conformance with TMC 18.44.080.8. 23 replacement trees will be planted on-site and in -lieu fees for the remaining 57 trees will be paid into the City's tree replacement fund. Project Site The project site is part of a larger parcel located at 9229 E. Marginal Way South (Parcel #5729800010) and outlined in red in the Figure 2 below. Paved parking areas for Aviation High School and adjacent office uses surround the project site on the north and east sides. Aviation High School and the Museum of Flight's Aviation Pavilion are situated nearby, east of the project site. The site is separated from Slip 6 of the Duwamish River on the south side by a strip of land approximately 25 feet wide owned by the Boeing Company. The site has no direct accels to the River. There is an existing King County storm drain easement running diagonal on tIle site from the southwest towards the northeast. Remaining on-site are three trailers currently accommodating the ongoing operations and activities of the Boeing Employees Amateur Radio Society (B.E.A.R.S.). The trailers house sensitive communication antennae and equipment, and provide emergency communication services for Boeing and the local public service communities. The site is relatively flat and consists of exposed soil across much of the site and some crushed gravel. The Museum has undertaken clean-up actions on the site over the past 10 years and it was found to be successfully remediated of hazardous materials per the Environmental Protection Agency in 2017. Existing trees on the site include 13 tall, mature trees along the ede 2 Shoreline Substantial Development July 19, 2018 southern property line, including 11 Lombardi poplars and 2 native Bitter cherries. Figure 1. Site Plan Rain Garden 3 B-52 Aircraft l Existing BEARS trailers to remain Permeable paving Vietnam AzVeteran's Memorial Plaza Shoreline Substantial Development July 19, 2018 Slip 6 Duwamish River Figure 2. Project Location Aviation High School 4. TUKWILA SHORELINE MASTER PROGRAM Museum of Flight Aviation Pavilion The City of Tukwila adopted a new Shoreline Master Program (SMP) on August 15, 2011 which was approved by the Washington State Department of Ecology on October 14, 2011 and became effective October 28, 2011. This project is subject to the new Shoreline Master Program. A. SHORELINE ENVIRONMENT DESIGNATION The shoreline environment designation for the site is High Intensity; the purpose of the High Intensity environment is to focus on water -oriented commercial, transportation, and industrial uses, with a priority on water -dependent uses. Non -water oriented uses should not be allowed except as part of a mixed use development, in limited situations where they would not conflict with or limit opportunities for water -oriented uses, or on sites where there is no direct access to the shoreline. New development should promote vegetation conservation and enhancement, sensitive areas protection, and preservation of water quality to assure no net loss of shoreline ecological functions. Visual and public access should be provided, where feasible. The shoreline buffer in the High Intensity environment is measured as 100 feet from the OHWM of the Duwamish River. A portion of the B-52 Memorial Park project, including one support structure for the B-52 aircraft landing gear, a rain garden, landscaping, and walkways of permeable pavement fall within the 100 foot shoreline buffer. Other project elements, including the two deep foundations for two tie -downs (a total of eight 18 -inch diameter auger - cast pilings) for the aircraft and the half of the park plaza, lie outside the buffer but within the 4 Shoreline Substantial Development July 19, 2018 / 200 foot shoreline jurisdiction. There is a small portion of the site that is located completely outside of the shoreline environment - see Figure 3. 200' from OHWM 100' from OHWM ti • • { Figure 3. Shoreline Buffers B. SHORELINE MASTER PROGRAM GOALS AND POLICIES • t . • t The following section discusses the Shoreline Master Program (SMP) goals and policies that apply to this project and are excerpted from Chapter 6 of the City's SMP. 6.3 Land Development Use and Economic Vitality Goal: Development along the shoreline that fosters the economic vitality of Tukwila while preserving the Tong -term benefits of the river. Policy5.3.8: Ensure that non -water dependent shoreline development in the MIC provides for shoreline multiple uses to the extent that site security and the success of industrial operations are not jeopardized; ensures no net loss of shoreline function and provides adequate mitigation for the loss of shoreline multiple use opportunities. Applicant Response: The Museum of Flight (MOF) B-52 Park is an extension of the Museum of Flight Air Pavilion, and the greater Museum complex. The MOF draws over half a million visitors 5 Shoreline Substantial Development July 19, 2018 \ per year and employs nearly 200 people. The B-52 Park will add an additional exhibit of a restored B -52G, while maintaining visual access to the river and an ecologically restored park area for visitors to enjoy. The applicant feels this use meets the goals for both economic vitality and preserving the benefits of the river. The B-52 project site is within the shoreline buffer but is separated from the actual high-water line by a 25' strip of land owned by the Boeing Company so that there is no direct access to the river from the project site. Shoreline access is controlled by the Boeing Company. The applicant believes that the development of the B-52 park provides flexibility for future development or shoreline function in that it has no permanent structures other than footings for the aircraft in the shoreline buffer area. Staff concurs with the applicant's response. The applicant has also provided a No Net Loss (NNL) checklist which is provided as Attachment 4 to this staff report. A NNL analysis of shoreline function was not required of the applicant, as the applicant is improving the existing soil, water, and shoreline jurisdictions conditions. Prior to the improvements, the site consisted of compacted gravel paving. Park improvements will include landscaping, a rain garden, and permeable paving, resulting in better soil stabilization, improved runoff water quality, and enhanced habitat for wildlife. 6.6 Access and Recreational Use Goal: Increase the amount and diversity of opportunities for public recreation and access to and along the river, including visual and cultural access, access to the water's edge, opportunities for small boat navigation and access, and connections to other neighborhoods, consistent with the shoreline character. Applicant Response: The B-52 project site is within the shoreline buffer, but is separated from the actual high-water line by a 25 foot strip of land owned by the Boeing Company so that there is no direct access to the river from the project site. However, the applicant is creating a park space that will be open to the public with many recreational amenities, including a loop path around the aircraft and a memorial plaza located on a raised mound surrounded by lawn from which one can view to the river. Staff concurs with the applicant's. response. Policy 5.6.14: For MIC properties not included in the King County Green River Trail Plan, require shoreline development to provide public access or a private natural area in lieu of public access, or otherwise mitigate the loss of public access. Applicant Response: The B-52 project is providing nearly an acre of open space with a native meadow planting, raingarden, loop path and memorial plaza. Because the project site is not directly adjacent to the river and is very flat, views from the southwest corner nearest the high- water line are not very clear. Therefore, the plaza area will be raised to allow for views to the 6 Shoreline Substantial Development July 19, 2018 7 river. The plaza and paths all meet ADA requirements, and furnishings including benches, handrails, and site lighting are provided. The park plantings are native/adaptive in accordance with Vegetation Protection and Landscaping section of the Tukwila Shoreline Master Program, and any tree removal is being either replaced or paid for by the Museum in lieu of planting additional trees, based on the restrictions inherent in our program. Staff concurs with the applicant's response. The project site is not included in the King County Green River Trail Plan. Policy 5.10.1: Design, locate, and manage shoreline development including streets, flood control projects, surface water drainage and sewer systems, clearing and grading activities, and landscaping in a manner which minimizes opportunities for pollutants to enter the river, provides erosion control and otherwise protects water quality. Applicant Response: Minimal grading will occur on the site. The former compacted gravel parking area was de -compacted and replaced with hydroseeded meadow as part of the first phase of this project, which has been completed. Next phases will enhance the meadow and add additional planting and permeable paving. At the low point of the site where water currently pools, a rain garden will be added to increase infiltration and filter any pollutants that may be carried with runoff across the site. Staff concurs with the applicant's response. 5. SHORELINE REGULATIONS TMC 18.44.130.6.3. Shoreline Administration states that a substantial development permit shall be granted only when the development proposed is consistent with the shoreline master program. The relevant SMP policies were discussed above. Below is a discussion of the relevant shoreline master program regulations that are incorporated into the zoning code that apply to this permit application. A. Permitted Uses: TMC 18.44.060 identifies permitted uses in the High Intensity environment. Under TMC 18.44.060.6.1 the following components of the proposed project are listed as permitted uses in the High Intensity buffer (100 feet from OHWM): c. Public parks, recreation and open space. d. Public and/or private promenades, footpaths or trails. f. Recreation structures such as benches, tables, viewpoints, and picnic shelters, provided no such structure shall exceed 15 feet in height and 25 square feet in area and no views of the shoreline are blocked from adjacent properties. Project elements within the High Intensity buffer consist of one support structure for the B-52 aircraft landing gear, a rain garden, landscaping, and walkways of permeable pavement. 7 Shoreline Substantial Development July 19, 2018 TMC 18.44.060.C.1 sets forth the permitted uses in the High Intensity environment area located outside of the buffer (within 200 feet of the OHWM): "All uses permitted in the High Intensity Buffer and/or the Shoreline Use Matrix may be allowed." Project elements within this area are considered permitted uses, consisting of two deep foundations for two tie -downs (a total of eight 18 -inch diameter auger -cast pilings) to support the B-52 aircraft, landscaping, walkways of permeable pavement, and a plaza. The plaza will consist of a low seating wall, a statue depicting a returning aviator honoring veterans, 2 of the 7 flag poles, educational exhibits, and lighting. B. Development Standards - TMC 18.44.070.0 The following development standards apply to this project. • TMC 18.44.070.C.1 Standards —The proposed project meets the development standards for the underlying Manufacturing Industrial Center/Heavy Industrial (MIC/H) zone. • TMC 18.44.070.C.2. Setbacks and site configuration - The yard setback adjacent to the river is 100 feet. The one structure proposed within the buffer is an undercarriage support for the aircraft's wingtip which will be 8 feet in height and is a permitted use within this area. • TMC 18.44.070.C.3. Height restrictions - The project does not exceed the maximum height limitation of 15 feet in within the River Buffer area or 45 outside the river buffer but within the shoreline jurisdiction. The maximum height of the fuselage or main body of the B-52 plane, when mounted, is anticipated to be 17 feet 11 inches above grade. The top of the vertical tail fin is anticipated to be 42 feet 1 inch above grade. The project structures will not block the views of the river for any residents. • TMC 18.44.070.C.4 Lighting — Two lighting fixtures mounted on 25 foot -tall poles will illuminate the site and be designed to limit spillover and glare on the property to the south where Slip 6 of the Duwamish River is located. Three uplights will illuminate the statue and flag pole base. Additional illumination of the pathways internal to the site is not provided, as the site is not intended to be used after dark or after Museum operating hours. C. Surface Water and Water Quality - TMC 18.44.070.D The project meets the requirements of this section, including incorporating low impact development techniques such as a rain garden and permeable pavement for the pedestrian pathways, and significant amounts of landscaping. D. Archaeological, Cultural and Historic Resources - TMC 18.44. 070.G A Cultural Resource Assessment was prepared for the project site prior to construction of the project and shared with the WA Department of Archaeology and Historic Preservation (DAHP). See Attachments 6 and 8 for their comment letters. The project will be conditioned to ensure the provisions of TMC 18.44.070.G are met. See Section 6 — Public Comments below for more discussion. 8 Shoreline Substantial Development July 19, 2018 E. Environmental Impact Mitigation - TMC 18.44.070.H All shoreline development and uses will occur in a manner that results in no net loss of shoreline ecological functions through the careful location and design of all allowed development and uses. An Environmental Checklist was submitted for the 8-52 Memorial Park Phase 1 and 2 (E16-0001) and a Notice of Decision was issued approving the proposal as a Planned Action on March 10, 2016. a. Avoiding the impact altogether by not taking a certain action or parts of an action. The project site is not adjacent to the Green River. The site is separated from Slip 6 on the Green River by approximately 25 feet of property owned by Boeing. The project avoids construction on the riverbank and underwater. b. Minimizing impacts by limiting the degree or magnitude of the action and its implementation by using appropriate technology or by taking affirmative steps to avoid or reduce impacts. • 13 trees will be removed on-site due to disease and site layout constrictions, and per TMC 18.44.080.B, 80 replacement trees are required. A minimum of 23 trees will be planted on site by the applicant and payment into the City's tree fund is allowed for up to 57 of the replacement trees. A tree adjacent to the site will be retained and protected during construction. • Low Impact Developments (LID), including a rain garden and pathways of permeable pavement will be incorporated in the proposed project to address runoff. • Landscaping, including native vegetation, will replace the former paving and compacted soil and gravel surfacing. • All pollution -generating impervious surface area within the site disturbance area was removed as part of previous work on the site in 2016. • Park lighting will be directed away from the river to prevent spillover. c. Rectifying the impact by repairing, rehabilitating, or restoring the affected environment. d. Reducing or eliminating the impact over time by preservation and maintenance operations. e. Compensating for the impact by replacing, enhancing, or providing substitute resources or environments. f. Monitoring the impact and the compensation projects and taking appropriate corrective measures. Impacts to vegetation in the shoreline jurisdiction will be addressed by increasing the amount of trees on the site. A Shoreline Tree Removal and Vegetation Clearing permit to remove 13 existing trees within the shoreline environment was approved on July 17, 2018. Per TMC 18.44.080.B, 80 replacement trees are required, which was determined based on the number and size of trees removed. The applicant will plant a minimum of 23 of the required replacement trees on site. The applicant will also pay a fee in lieu into the City's tree replacement fund for each of the remaining 57 trees which are not able to be planted on site due to King County easement restrictions and the design intent and the operational requirements of the project. An existing tree located close to the park on the 9 Shoreline Substantial Development July 19, 2018 adjacent parcel to the south will be retained and its critical root zone protected during construction. F. Signs - TMC 18.44. 070.L Signs within the shoreline jurisdiction will be limited to interpretive signs. G. Vegetation Protection and Landscaping - TMC 18.44.080 A total of 13 trees will be removed within the shoreline jurisdiction along the southern border of the proposed IB -52 Bomber Memorial Park site when this project is implemented. The subject trees include 11 Lombardi poplars and two native Bitter cherries, ranging from 25 feet to 85 feet in height and 8 to 26 inches in diameter at 4.5 feet from the ground. Three trees were previously topped at 35 feet, and two trees are diseased and considered not viable. Per TMC 18.44.080.B, 80 native trees are required as replacement, which was determined based on the number and size of trees removed. The applicant is proposing planting 23 of the required replacement trees on site and paying a fee in lieu into the City's tree replacement fund for each of the remaining 57 trees. A number of alternatives were considered to increase the proposed number of replacement trees planted on site, including adding trees to the eastern portion of the site, screening the B.E.A.R.S. trailers on the south side of the property, adding trees in large planters along the King County stormwater easement that could be moved, if needed, and planting trees off-site adjacent to Slip 6. The applicant believed placing more trees on the site was not feasible due to the following reasons: • Planting more trees on the eastern border of the site conflicted with project goals of maintaining visibility of the military branch flags, sculpture, and the aircraft from surrounding vantage points. • Operational requirements of the site, including King County's requirement to keep access to a storm drain manhole along the western portion of the site free of trees. • At the south side of the project site, the Museum of Flight has long accommodated the ongoing operations and activities of the Boeing Employees Amateur Radio Society (B.E.A.R.S.). The trailers here house sensitive communication antennae and equipment, and provide emergency communication services for Boeing and the local public service communities. Existing trees are being removed from this area in order to limit the potential for damage or interference with B.E.A.R.S. operations. • Trees in planters have a low survival rate and have limited mobility. • Given the known soil conditions on the project site, it is speculated that adjacent properties may Likely contain contamination, unstable soils, or invasive existing plantings, suggesting that a more intrusive soils investigation, tree survey, and planting study could ensue. The Boeing parcels adjacent to the project site and to Slip 6 (King County Parcel Nos. 562420-1038 and 562420-1032) are further understood to be high - security facillities, and the applicant believes coordination of existing conditions investigations and tree plantings at Slip 6 to be operationally prohibitive. 10 Shoreline Substantial Development July 19, 2018 f o.. On-site trees to be removed The 23 replacement trees to be planted on-site include a native mix of Western Red Cedar, Cascara, Shore Pine, and Oregon Ash. An existing tree located close to the park on the adjacent parcel to the south will be retained and its critical root zone protected during construction per TMC 18.54.070.1-11. Tree removal and replacement was approved in a Notice of Decision issued on July 17, 2018. Landscape maintenance will occur as needed for successful establishment of the plantings. The applicant will need to submit annual photos of all 23 trees to the City's Urban Environmentalist to ensure proper maintenance and a 100% survival rate for three years following the initial landscape inspection. Per TMC 18.44.080.8.5, the property owner is required to ensure the viability and Tong -term health of trees planted for replacement through proper care and maintenance for the life of the project. Replaced trees that do not survive must be replanted in the next appropriate season for planting. H. Public Access - TMC 18.44.100 Public access is not required for this project as the site does not abut the Duwamish River shoreline. However, the 8-52 park project is providing nearly an acre of open space with a loop path and memorial plaza. The plaza will be raised to allow for views to the river. The plaza and paths all meet ADA requirements, and furnishings including benches, handrails, and site lighting are provided. I. Shoreline Design Guidelines - TMC 18.44.110 1. Relationship of Structure to Site. 2. Building Design. These sections of the TMC do not apply as no buildings are being constructed, only the 11 Shoreline Substantial Development July 19, 2018 N support structures for the B-52 aircraft. 3. Design of Public Access. The project is consistent with the public access design guidelines. An attractively designed and welcoming park will provide visual access to the Duwamish River and nearly an acre of open space with a loop trail to view the B-52 plane and the surrounding area. Site landscaping will consist of native vegetation, consistent with TMC 18.44.080. Durable seating is provided via a low seating wall around the memorial plaza and four benches of metal and wood„ Environmentally friendly porous pavement is used on the pedestrian pathways. 6. PUBLIC COMMENTS Comments were received during the Notice of Application period from Gretchen Kaehler of the Washington Department of Archaeology and Historic Preservation on May 24, 2018 (see Attachment 6). Ms. Kaehler notified staff that the project area has a high potential to contain archaeological resources due to the site's location on an old Oxbow Bend of the Duwamish River and proximity to four recorded precontact archaeological sites within 1 mile of the project. She requested that a professional archaeological survey of the project area prior to ground disturbance be conducted to ensure that protected resources would not be inadvertently damaged during construction. Response: A Cultural Resource Assessment was conducted in response to comments from DAHP and submitted to the City, DAHP, King County, and the Muckleshoot, Snoqualmie, Suquamish, and Tulalip tribes on June 26, 2018. The assessment included background research using sources such as geotechnical reports, public records, and historic maps and resources to develop a full of the history of land use and archaeological potential in the project area. The conclusions and recommendations of the Cultural Resource Assessment include the following: "Parcel history, geotechnical borings, and nearby monitoring indicate that at least 4 to 7 feet of recent fill, and possibly more, are present in the study area. Groundwater is likely present at around 10 feet, representing a likely lower boundary of occupation or use. Native sediments could be present between 4 and 10 feet below the surface. Archaeological potential, however, is low to moderate. The native ground surface may have been removed by the cleanup, if not by prior industrial activity. However, the presence of historical artifacts at 12 feet below the surface on the adjacent parcel indicates that some potential remains. The footprint of ground disturbance deeper than 4 feet below the surface is limited to the eight auger -cast piles that form the foundation for the two tie - downs for the project. If possible, given construction methods, archaeological monitoring should occur at those locations, to comply with TMC 18.50.110. An archaeological monitoring plan should be developed and provided to DAHP and interested Native American Tribes. An Inadvertent Discovery Plan should also be 12 Shoreline Substantial Development July 19, 2018 developed, to guide actions in the event that archaeological materials are encountered when the monitor is not on site." DAHP staff submitted a follow-up letter dated July 12, 2018 (See Attachment 8) to the City stating they have reviewed the report and concur with the recommendation that ground disturbance for the project be monitored by a professional archaeologist under an archaeological monitoring and inadvertent discovery plan (MDIP) reviewed by DAHP and the Tribes. DAHP also requested that an MDIP be prepared and submitted to DAHP and the Tribes for review prior to ground disturbance and monitoring. The Assessment report's and DAHP recommendations will be included as a condition of approval of this permit. 7. SEPA AND OTHER CITY APPROVALS An Environmental Checklist was submitted for the B-52 Memorial Park proposal (E16-0001) and a Notice of Decision was issued approving the proposal as a SEPA Planned Action on March 10, 2016. A Shoreline Tree Removal and Vegetation Clearing permit (L18-0030) was approved for this project on July 17, 2018. The applicant must obtain a building permit for park structures. 8. RECOMMENDATION Approval of the shoreline substantial development permit with the following condition: 1. Per the conclusions and recommendations of the Cultural Resource Assessment conducted for this project, the following actions are required: a. Develop and distribute an archaeological monitoring plan to DAHP and interested Native American Tribes prior to ground disturbance and monitoring. b. A professional archaeologist who meets the Secretary of the Interior standards for Professional Archaeology shall be on site to monitor excavation and placement of the eight auger -cast piles that form the foundation for the two tie -downs. c. Develop an Inadvertent Discovery Plan to guide actions in the event that archaeological materials are discovered when the monitor is not on site. 13 L.� City of Tukwila Allan Ekberg, Mayor Department of Community Development - Jack Pace, Director July 17, 2018 STAFF REPORT AND NOTICE OF DECISION TO: Elias Gardner, Applicant, SRG Washington State Department of Ecology Washington State Department of Fish and Wildlife King County Department of Assessments This letter serves as a Notice of Decision and is issued pursuant to TMC 18104.170 on the following project and permit approval. Project File Number: Applicant: Type of Permit Applied for: Project Description: Location: Associated Files: Comprehensive Plan Designation/Zoning District: I. PROJECT INFORMATION L18-0030 Elias Gardner, SRG Partnership, Inc. Shoreline Tree Removal and Vegetation Clearing Proposal is to remove and replace 13 trees within the shoreline jurisdiction on the proposed B-52 Memorial Park site. King County Parcel # 5729800010 L18-0031 Shoreline Substantial Development RECEIVED CITY OF TUKWILA JUL 2 3 2018 PERMIT CENTER Manufacturing Industrial Center/Heavy Industrial (MIC/H) II. DECISION 0 N L T R # .,.,.... REVISION N0. L. SEPA Determination: An Environmental Checklist was submitted for the B-52 Memorial Park proposal (E16- 0001) and a Notice of Decision was issued approving the proposal as a Planned Action on March 10, 2016. Decision on Substantive Permit: The Community Development Director has determined that the special permission application does comply with applicable City and State code requirements and has approved that application, subject to the following conditions: 1 t6- 006 1. Applicant shall plant at least 23 of the required 80 repiacement trees on-site per approved plans. Payment into the City's Tree Fund is allowed for up to 57 replacement trees. At the time of this writing, the fee per replacement tree is $124.00; this fee is subject to change. At the time of initial planting inspection associated with the building permit, payment into the City's Tree Fund will be at the rate codified/in place at the time of inspection. 2. Trees may be planted between October 15th and April 15th; this ensures the best start for tree health and retention for the mitigation monitoring period and beyond. Trees shall be planted after construction of the B-5 Park, as construction equipment has the potential to damage newly planted trees. 3. Trees should be watered weekly during the dry months (generally July -September or as necessary depending on conditions) for the first two growing seasons or until the plants are established. 4. Applicant shall submit annual photos of all 23 replacement trees to the City's Urban Environmentalist (�.'e3 urr r,^, eA lawn, i) to ensure proper maintenance and a 100% survival rate for three years following the initial landscape inspection. 5. Per TMC 18.44.080.8.5, the property owner is required to ensure the viability and long-term health of trees planted for replacement through proper care and maintenance for the life of the project. Replaced trees that do not survive must be replanted in the next appropriate season for planting. 6. Topping of trees is prohibited (unless absolutely necessary to protect utility lines) and will be regulated as removal requiring tree replacement. 7. Contact the City's Urban Environmentalist (Andro3 d't..41;.Nd a h go%) fora post -construction inspection of protected trees. All corrective or reparative pruning must be conducted by a Qualified Tree Professional. III. FINDINGS This tree clearing permit application is to remove 13 trees within the shoreline jurisdiction along the southern border of the proposed B-52 Bomber Memorial Park site. The subject trees include 11 Lombardi poplars and two native Bitter cherries, ranging from 25 feet to 85 feet in height and 8 to 26 inches in diameter at 4.5 feet from the ground. Three trees were previously topped at 35 feet, and two trees are diseased and considered not viable. Per TMC 18.44.080.B, 80 replacement trees are required, which was determined based on the number and size of trees removed. The applicant is proposing planting 23 of the required replacement trees on site. Several options were considered to increase the number of replacement trees planted on site, including adding trees to the eastern portion of the site, screening the trailers on the south side of the property, or adding trees in large planters that could be moved, if needed. Per the applicant, these options conflicted with project goals of maintaining visibility of the military bunch flags, sculpture, and the aircraft, as well as operational requirements of the site. The trees to be planted on site include a native mix of Western Red Cedar, Cascara, Shore Pine, and Oregon Ash. An irrigation system is included to ensure the viability and long-term health of the replacement trees. An existing tree located cloy to the park on the adjacent parcel to the south will be retained and its critical root zone protected during construction. Payment into the City's Tree Fund is allowed for up to 57 replacement trees. At the time of this writing, the fee per replacement tree is $124.00; this fee is subject to change. At the time of initial planting inspection associated with the building permit, payment into the City's Tree Fund will be required at the rate codified/in place at the time of inspection. 2 N IV. YOUR APPEAL RIGHTS The Decision on this Permit Application is a Type 2 decision pursuant to Tukwila Municipal Code §18.104.010. Other land use applications related to this project may still be pending. One administrative appeal to the Hearing Examiner of the Decision on the Permit itself is permitted. A party who is not satisfied with the outcome of the Hearing Examiner appeal process may file an appeal in King County Superior Court from the Hearing Examiner's decision. IV. PROCEDURES AND TIME FOR APPEALING In order to appeal the Community Development Director's decision on the Permit Application, a written notice of appeal must be filed with the Department of Community Development within 14 -days of the issuance of this Decision, that is by July 31, 2018. The requirements for such appeals are set forth in Tukwila Municipal Code 18.116. AI appeal materials shall be submitted to the Department of Community Development. Appeal materials MUST include: 1. The name of the appealing party. 2. The address and phone number of the appealing party; and if the appealing party is corporation, association or other group, the address and phone number of a contact person authorized to receive notices on the appealing party's behalf. 3. A statement identifying the decision being appealed and the alleged errors in the decision, including any specific challenge to an MDNS. 4. The Notice of Appeal shall identify (a) the specific errors of fact or errors in application of the law in the decision being appealed; (b) the harm suffered or anticipated by the appellant, and (c) the relief sought. The scope of an appeal shall be limited to matters or issues raised in the Notice of Appeal. 5. Appeal fee per the current fee schedule, additional hourly charges may apply. In addition, all hearing examiner costs will be passed through to the appellant. V. APPEAL HEARINGS PROCESS Any administrative appeal regarding the Permit shall be conducted as an open record hearing before the Hearing Examiner based on the testimony and documentary evidence presented at the open record hearing. The Hearing Examiner decision on the appeal is the City's final decision. Any party wishing to challenge the Hearing Examiner decision on this application must file an appeal pursuant to the procedures and time limitations set forth in RCW 36.70C. An appeal challenging a DNS, an MDNS or an EIS may be included in such an appeal. If no appeal of the Hearing Examiner decision is properly filed in Superior Court within such time limit, the Decision on this permit will be final. The City's decision to issue a DNS, an MDNS or an EIS is final for this permit and any other pending permit applications for the development of the subject property. 3 VI. INSPECTION OF INFORMATION ON THE APPLICATION Project materials including the application, any staff reports, and other studies related to the permits are available for inspection at the Tukwila Department of Community Development, 6300 Southcenter Blvd., Suite 100, Tukwila, Washington 98188 from Monday through Friday between 8:30 a.m. and 5:00 p.m. The project planner is Lynn Miranda, who may be contacted at 206.433.7162 for further information. Property owners affected by this decision may request a change in valuation for their property tax purposes. Contact the King County Assessor's Office for further information regarding property tax valuation changes. The notice board must be removed at the expiration of the appeal period if no appeal is filed. 1�. "'rte Jack lace, Director Department of Community Development City of Tukwila 4 City of Tukwila Allan Ekberg, Mayor Department of Community Development - Jack Pace, Director STAFF REPORT. SHORELINE SUBSTANTIAL DEVELOPMENT 1. SUMMARY OF PROPOSED ACTION This project proposes to create a permanent exhibit of a B -52G Stratofortress 59-2584 Midnight Express aircraft and a Veteran's Memorial Plaza in a park -like setting. The project site is not adjacent to the Duwamish River but a significant portion of the project lies within Ordinary High Water Mark (OHWM) of the river. 2. GENERAL INFORMATION Project: File Number: Applicant: Location: Associated Applications/ Permits: Museum of Flight's B-52 Memorial Park, Phase 2 L18-0031: Shoreline Substantial Development P Elias Gardner, SRG Partnership, Inc. 9229 E. Marginal Way South, Tukwila King County Parcel #5729800010 REVIEWED FOR CODE COMPLIANCE ROVED DEC 12 2018 B it City of Tukwila O'EfA/ISION CITY OF i+RI L_J 01) i ; tom:,.,. i E16-0001 SEPA L18-0030 Shoreline Tree Removal and Vegetation Clearing Permit D18-0088 Development Permit Comprehensive Plan/ Zoning Designation: Manufacturing Industrial Center/Heavy Industrial (MIC/H) SEPA Determination: Approval as a Planned Action on March 10, 2016 (E16-0001) x RREcTION LTR# I Staff Contact: Lynn Miranda, Senior Planner Attachments: 1. Geotechnical Engineering Report prepared by GeoEngineers and dated February 5, 2016. 2. Report Addendum to Geotechnical Report prepared by GeoEngineers and dated May 15, 2018. 3. Stormwater Technical Information Report prepared by Magnusson Klemencic and dated March 26, 2018. 4. No Net Loss Checklist submitted April 9, 2018. REVISION N0. I 5. Letter from Stanley Jaworowski to DCD RE: Shoreline Tree Removal and Vegetation Clearing Permit for B-52 Memorial Park and Vietnam Veteran's Memorial and dated April 9, 2018. 6. Comment Letter from WA Dept. of Archaeology and Historic Preservation, dated May 1 Shoreline Substantial Development July 19, 2018 24, 2018. 7. Memo from Stan Jaworoski to Lynn Miranda RE: L18-0031 Shoreline Substantial Development for B-52 Memorial Park and dated May 30, 2018, addressing the project's consistency with applicable Shoreline Master Plan goals and policies. 8. Cultural Resource Assessment for the B-52 Memorial Park prepared by Anchor QEA, dated June 2018. 9. Response letter from WA Dept. of Archaeology and Historic Preservation, dated July 12, 2018. 3. PROJECT DESCRIPTION This project proposes to create a permanent exhibit of a B -52G Stratofortress 59-2584 Midnight Express aircraft and a Veteran's Memorial Plaza in a park -like setting which will be open to the public as part of the Museum of Flight. On-site work includes constructing deep foundations for two tie -downs (a total of eight 18 -inch diameter auger -cast pilings) to support the B-52 aircraft, a 650 square -foot rain garden, landscaping, walkways of permeable pavement, and a plaza. The plaza will consist of a low seating wall, a statue depicting a returning aviator honoring veterans, 7 flag poles, educational exhibits, and lighting (see Figure 1). Due to direct conflicts with the proposed B-52 wing location, 13 existing trees along the south property line will be removed, requiring 80 replacement trees in conformance with TMC 18.44.080.B. 23 replacement trees will be planted on-site and in -lieu fees for the remaining 57 trees will be paid into the City's tree replacement fund. Project Site The project site is part of a larger parcel located at 9229 E. Marginal Way South (Parcel #5729800010) and outlined in red in the Figure 2 below. Paved parking areas for Aviation High School and adjacent office uses surround the project site on the north and east sides. Aviation High School and the Museum of Flight's Aviation Pavilion are situated nearby, east of the project site. The site is separated from Slip 6 of the Duwamish River on the south side by a strip of land approximately 25 feet wide owned by the Boeing Company. The site has no direct accel;s to the River. There is an existing King County storm drain easement running diagonal on tlte site from the southwest towards the northeast. Remaining on-site are three trailers currently accommodating the ongoing operations and activities of the Boeing Employees Amateur Radio Society (B.E.A.R.S.). The trailers house sensitive communication antennae and equipment, and provide emergency communication services for Boeing and the local public service communities. • The site is relatively flat and consists of exposed soil across much of the site and some crushed gravel. The Museum has undertaken clean-up actions on the site over the past 10 years and it was found to be successfully remediated of hazardous materials per the Environmental Protection Agency in 2017. Existing trees on the site include 13 tall, mature trees along the 2 , Shoreline Substantial Development July 19, 2018 southern property line, including 11 Lombardi poplars and 2 native Bitter cherries. Figure 1. Site Plan ,1 .1 • - - 1 I Atf Rain Garden 01111111....M11111 3 8-52 Aircraft I Existing BEARS trailers to remain Permeable paving Vietnam Veteran's Memorial Air./.."7. Plaza Shoreline Substantial Development July 19, 2018 Slip 6 Duwamish River Figure 2. Project Location Aviation High School 4. TUKWILA SHORELINE MASTER PROGRAM Museum of Flight Aviation Pavilion The City of Tukwila adopted a new Shoreline Master Program (SMP) on August 15, 2011 which was approved by the Washington State Department of Ecology on October 14, 2011 and became effective October 28, 2011. This project is subject to the new Shoreline Master Program. A. SHORELINE ENVIRONMENT DESIGNATION The shoreline environment designation for the site is High Intensity; the purpose of the High Intensity environment is to focus on water -oriented commercial, transportation, and industrial uses, with a priority on water -dependent uses. Non -water oriented uses should not be allowed except as part of a mixed use development, in limited situations where they would not conflict with or limit opportunities for water -oriented uses, or on sites where there is no direct access to the shoreline. New development should promote vegetation conservation and enhancement, sensitive areas protection, and preservation of water quality to assure no net Toss of shoreline ecological functions. Visual and public access should be provided, where feasible. The shoreline buffer in the High Intensity environment is measured as 100 feet from the OHWM of the Duwamish River. A portion of the B-52 Memorial Park project, including one support structure for the B-52 aircraft landing gear, a rain garden, landscaping, and walkways of permeable pavement fall within the 100 foot shoreline buffer. Other project elements, including the two deep foundations for two tie -downs (a total of eight 18 -inch diameter auger - cast pilings) for the aircraft and the half of the park plaza, lie outside the buffer but within the 4 Shoreline Substantial Development July 19, 2018 200 foot shoreline jurisdiction. There is a small portion of the site that is located completely outside of the shoreline environment - see Figure 3. 200' from OHWM 100' from OHWM s,. t • 4 Figure 3. Shoreline Buffers B. SHORELINE MASTER PROGRAM GOALS AND POLICIES The following section discusses the Shoreline Master Program (SMP) goals and policies that apply to this project and are excerpted from Chapter 6 of the City's SMP. 6.3 Land Development Use and Economic Vitality Goal: Development along the shoreline that fosters the economic vitality of Tukwila while preserving the Tong -term benefits of the river. Policy 5.3.8: Ensure that non -water dependent shoreline development in the MIC provides for shoreline multiple uses to the extent that site security and the success of industrial operations are not jeopardized; ensures no net Toss of shoreline function and provides adequate mitigation for the loss of shoreline multiple use opportunities. Applicant Response: The Museum of Flight (MOF) B-52 Park is an extension of the Museum of Flight Air Pavilion, and the greater Museum complex. The MOF draws over half a million visitors 5 Shoreline Substantial Development July 19, 2018 per year and employs nearly 200 people. The B-52 Park will add an additional exhibit of a restored B -52G, while maintaining visual access to the river and an ecologically restored park area for visitors to enjoy. The applicant feels this use meets the goals for both economic vitality and preserving the benefits of the river. The B-52 project site is within the shoreline buffer but is separated from the actual high-water line by a 25' strip of land owned by the Boeing Company so that there is no direct access to the river from the project site. Shoreline access is controlled by the Boeing Company. The applicant believes that the development of the B-52 park provides flexibility for future development or shoreline function in that it has no permanent structures other than footings for the aircraft in the shoreline buffer area. Staff concurs with the applicant's response. The applicant has also provided a No Net Loss (NNL) checklist which is provided as Attachment 4 to this staff report. A NNL analysis of shoreline function was not required of the applicant, as the applicant is improving the existing soil, water, and shoreline jurisdictions conditions. Prior to the improvements, the site consisted of compacted gravel paving. Park improvements will include landscaping, a rain garden, and permeable paving, resulting in better soil stabilization, improved runoff water quality, and enhanced habitat for wildlife. 6.6 Access and Recreational Use Goal: Increase the amount and diversity of opportunities for public recreation and access to and along the river, including visual and cultural access, access to the water's edge, opportunities for small boat navigation and access, and connections to other neighborhoods, consistent with the shoreline character. Applicant Response: The B-52 project site is within the shoreline buffer, but is separated from the actual high-water line by a 25 foot strip of land owned by the Boeing Company so that there is no direct access to the river from the project site. However, the applicant is creating a park space that will be open to the public with many recreational amenities, including a loop path around the aircraft and a memorial plaza located on a raised mound surrounded by lawn from which one can view to the river. Staff concurs with the applicant's response. Policy 5.6.14: For MIC properties not included in the King County Green River Trail Plan, require shoreline development to provide public access or a private natural area in lieu of public access, or otherwise mitigate the loss of public access. Applicant Response: The B-52 project is providing nearly an acre of open space with a native meadow planting, raingarden, loop path and memorial plaza. Because the project site is not directly adjacent to the river and is very flat, views from the southwest corner nearest the high- water line are not very clear. Therefore, the plaza area will be raised to allow for views to the 6 Shoreline Substantial Development July 19, 2018 river. The plaza and paths all meet ADA requirements, and furnishings including benches, handrails, and site lighting are provided. The park plantings are native/adaptive in accordance with Vegetation Protection and Landscaping section of the Tukwila Shoreline Master Program, and any tree removal is being either replaced or paid for by the Museum in lieu of planting additional trees, based on the restrictions inherent in our program. Staff concurs with the applicant's response. The project site is not included in the King County Green River Trail Plan. Policy 5.10.1: Design, locate, and manage shoreline development including streets, flood control projects, surface water drainage and sewer systems, clearing and grading activities, and landscaping in a manner which minimizes opportunities for pollutants to enter the river, provides erosion control and otherwise protects water quality. Applicant Response: Minimal grading will occur on the site. The former compacted gravel parking area was de -compacted and replaced with hydroseeded meadow as part of the first phase of this project, which has been completed. Next phases will enhance the meadow and add additional planting and permeable paving. At the low point of the site where water currently pools, a rain garden will be added to increase infiltration and filter any pollutants that may be carried with runoff across the site. Staff concurs with the applicant's response. 5. SHORELINE REGULATIONS TMC 18.44.130.6.3. Shoreline Administration states that a substantial development permit shall be granted only when the development proposed is consistent with the shoreline master program. The relevant SMP policies were discussed above. Below is a discussion of the relevant shoreline master program regulations that are incorporated into the zoning code that apply to this permit application. A. Permitted Uses: TMC 18.44.060 identifies permitted uses in the High Intensity environment. Under TMC 18.44.060.8.1 the following components of the proposed project are listed as permitted uses in the High Intensity buffer (100 feet from OHWM): c. Public parks, recreation and open space. d. Public and/or private promenades, footpaths or trails. f. Recreation structures such as benches, tables, viewpoints, and picnic shelters, provided no such structure shall exceed 15 feet in height and 25 square feet in area and no views of the shoreline are blocked from adjacent properties. Project elements within the High Intensity buffer consist of one support structure for the 6-52 aircraft landing gear, a rain garden, landscaping, and walkways of permeable pavement. 7 Shoreline Substantial Development July 19, 2018 TMC 18.44.060.C.1 sets forth the permitted uses in the High Intensity environment area located outside of the buffer (within 200 feet of the OHWM): "All uses permitted in the High Intensity Buffer and/or the Shoreline Use Matrix may be allowed." Project elements within this area are considered permitted uses, consisting of two deep foundations for two tie -downs (a total of eight 18 -inch diameter auger -cast pilings) to support the B-52 aircraft, landscaping, walkways of permeable pavement, and a plaza. The plaza will consist of a low seating wall, a statue depicting a returning aviator honoring veterans, 2 of the 7 flag poles, educational exhibits, and lighting. B. Development Standards - TMC 18.44.070.0 The following development standards apply to this project. • TMC 18.44.070.C.1 Standards —The proposed project meets the development standards for the underlying Manufacturing Industrial Center/Heavy Industrial (MIC/H) zone. • TMC 18.44.070.C.2. Setbacks and site configuration - The yard setback adjacent to the river is 100 feet. The one structure proposed within the buffer is an undercarriage support for the aircraft's wingtip which will be 8 feet in height and is a permitted use within this area. • TMC 18.44.070.C.3. Height restrictions - The project does not exceed the maximum height limitation of 15 feet in within the River Buffer area or 45 outside the river buffer but within the shoreline jurisdiction. The maximum height of the fuselage or main body of the B-52 plane, when mounted, is anticipated to be 17 feet 11 inches above grade. The top of the vertical tail fin is anticipated to be 42 feet 1 inch above grade. The project structures will not block the views of the river for any residents. • TMC 18.44.070.C.4 Lighting — Two lighting fixtures mounted on 25 foot -tall poles will illuminate the site and be designed to limit spillover and glare on the property to the south where Slip 6 of the Duwamish River is located. Three uplights will illuminate the statue and flag pole base. Additional illumination of the pathways internal to the site is not provided, as the site is not intended to be used after dark or after Museum operating hours. C. Surface Water and Water Quality - TMC 18.44.070.D The project meets the requirements of this section, including incorporating low impact development techniques such as a rain garden and permeable pavement for the pedestrian pathways, and significant amounts of landscaping. D. Archaeological, Cultural and Historic Resources - TMC 18.44. 070.G A Cultural Resource Assessment was prepared for the project site prior to construction of the project and shared with the WA Department of Archaeology and Historic Preservation (DAHP). See Attachments 6 and 8 for their comment letters. The project will be conditioned to ensure the provisions of TMC 18.44.070.G are met. See Section 6— Public Comments below for more discussion. 8 Shoreline Substantial Development July 19, 2018 E. Environmental Impact Mitigation - TMC 18.44.070.H All shoreline development and uses will occur in a manner that results in no net loss of shoreline ecological functions through the careful location and design of all allowed development and uses. An Environmental Checklist was submitted for the B-52 Memorial Park Phase 1 and 2 (E16-0001) and a Notice of Decision was issued approving the proposal as a Planned Action on March 10, 2016. a. Avoiding the impact altogether by not taking a certain action or parts of an action. The project site is not adjacent to the Green River. The site is separated from Slip 6 on the Green River by approximately 25 feet of property owned by Boeing. The project avoids construction on the riverbank and.underwater. b. Minimizing impacts by limiting the degree or magnitude of the action and its implementation by using appropriate technology or by taking affirmative steps to avoid or reduce impacts. • 13 trees will be removed on-site due to disease and site layout constrictions, and per TMC 18.44.080.8, 80 replacement trees are required. A minimum of 23 trees will be planted on site by the applicant and payment into the City's tree fund is allowed for up to 57 of the replacement trees. A tree adjacent to the site will be retained and protected during construction. • Low Impact Developments (LID), including a rain garden and pathways of permeable pavement will be incorporated in the proposed project to address runoff. • Landscaping, including native vegetation, will replace the former paving and compacted soil and gravel surfacing. • All pollution -generating impervious surface area within the site disturbance area was removed as part of previous work on the site in 2016. • Park lighting will be directed away from the river to prevent spillover. c. Rectifying the impact by repairing, rehabilitating, or restoring the affected environment. d. Reducing or eliminating the impact over time by preservation and maintenance operations. e. Compensating for the impact by replacing, enhancing, or providing substitute resources or environments. f. Monitoring the impact and the compensation projects and taking appropriate corrective measures. Impacts to vegetation in the shoreline jurisdiction will be addressed by increasing the amount of trees on the site. A Shoreline Tree Removal and Vegetation Clearing permit to remove 13 existing trees within the shoreline environment was approved on July 17, 2018. Per TMC 18.44.080.B, 80 replacement trees are required, which was determined based on the number and size of trees removed. The applicant will plant a minimum of 23 of the required replacement trees on site. The applicant will also pay a fee in lieu into the City's tree replacement fund for each of the remaining 57 trees which are not able to be planted on site due to King County easement restrictions and the design intent and the operational requirements of the project. An existing tree located close to the park on the 9 Shoreline Substantial Development July 19, 2018 adjacent parcel to the south will be retained and its critical root zone protected during construction. F. Signs - TMC 18.44. 070.L Signs within the shoreline jurisdiction will be limited to interpretive signs. G. Vegetation Protection and Landscaping - TMC 18.44.080 A total of 13 trees will be removed within the shoreline jurisdiction along the southern border of the proposed B-52 Bomber Memorial Park site when this project is implemented. The subject trees include 11 Lombardi poplars and two native Bitter cherries, ranging from 25 feet to 85 feet in height and 8 to 26 inches in diameter at 4.5 feet from the ground. Three trees were previously topped at 35 feet, and two trees are diseased and considered not viable. Per TMC 18.44.080.B, 80 native trees are required as replacement, which was determined based on the number and size of trees removed. The applicant is proposing planting 23 of the required replacement trees on site and paying a fee in lieu into the City's tree replacement fund for each of the remaining 57 trees. A number of alternatives were considered to increase the proposed number of replacement trees planted on site, including adding trees to the eastern portion of the site, screening the B.E.A.R.S. trailers on the south side of the property, adding trees in large planters along the King County stormwater easement that could be moved, if needed, and planting trees off-site adjacent to Slip 6. The applicant believed placing more trees on the site was not feasible due to the following reasons: • Planting more trees on the eastern border of the site conflicted with project goals of maintaining visibility of the military branch flags, sculpture, and the aircraft from surrounding vantage points. • Operational requirements of the site, including King County's requirement to keep access to a storm drain manhole along the western portion of the site free of trees. • At the south side of the project site, the Museum of Flight has long accommodated the ongoing operations and activities of the Boeing Employees Amateur Radio Society (B.E.A.R.S.). The trailers here house sensitive communication antennae and equipment, and provide emergency communication services for Boeing and the local public service communities. Existing trees are being removed from this area in order to limit the potential for damage or interference with B.E.A.R.S. operations. • Trees in planters have a low survival rate and have limited mobility. • Given the known soil conditions on the project site, it is speculated that adjacent properties may likely contain contamination, unstable soils, or invasive existing plantings, suggesting that a more intrusive soils investigation, tree survey, and planting study could ensue. The Boeing parcels adjacent to the project site and to Slip 6 (King County Parcel Nos. 562420-1038 and 562420-1032) are further understood to be high - security facilities, and the applicant believes coordination of existing conditions investigations and tree plantings at Slip 6 to be operationally prohibitive. 10 Shoreline Substantial Development July 19, 2018 On-site trees to be removed The 23 replacement trees to be planted on-site include a native mix of Western Red Cedar, Cascara, Shore Pine, and Oregon Ash. An existing tree located close to the park on the adjacent parcel to the south will be retained and its critical root zone protected during construction per TMC 18.54.070.1-11. Tree removal and replacement was approved in a Notice of Decision issued on July 17, 2018. Landscape maintenance will occur as needed for successful establishment of the plantings. The applicant will need to submit annual photos of all 23 trees to the City's Urban Environmentalist to ensure proper maintenance and a 100% survival rate for three years following the initial landscape inspection. Per TMC 18.44.080.6.5, the property owner is required to ensure the viability and long-term health of trees planted for replacement through proper care and maintenance for the life of the project. Replaced trees that do not survive must be replanted in the next appropriate season for planting. H. Public Access - TMC 18.44.100 Public access is not required for this project as the site does not abut the Duwamish River shoreline. However, the B-52 park project is providing nearly an acre of open space with a loop path and memorial plaza. The plaza will be raised to allow for views to the river. The plaza and paths all meet ADA requirements, and furnishings including benches, handrails, and site lighting are provided. I. Shoreline Design Guidelines - TMC 18.44.110 1. Relationship of Structure to Site. 2. Building Design. These sections of the TMC do not apply as no buildings are being constructed, only the 11 Shoreline Substantial Development July 19, 2018 support structures for the B-52 aircraft. 3. Design of Public Access. The project is consistent with the public access design guidelines. An attractively designed and welcoming park will provide visual access to the Duwamish River and nearly an acre of open space with a loop trail to view the B-52 plane and the surrounding area. Site landscaping will consist of native vegetation, consistent with TMC 18.44.080. Durable seating is provided via a low seating wall around the memorial plaza and four benches of metal and wood. Environmentally friendly porous pavement is used on the pedestrian pathways. 6. PUBLIC COMMENTS Comments were received during the Notice of Application period from Gretchen Kaehler of the Washington Department of Archaeology and Historic Preservation on May 24, 2018 (see Attachment 6). Ms. Kaehler notified staff that the project area has a high potential to contain archaeological resources due to the site's location on an old Oxbow Bend of the Duwamish River and proximity to four recorded precontact archaeological sites within 1 mile of the project. She requested that a professional archaeological survey of the project area prior to ground disturbance be conducted to ensure that protected resources would not be inadvertently damaged during construction. Response: A Cultural Resource Assessment was conducted in response to comments from DAHP and submitted to the City, DAHP, King County, and the Muckleshoot, Snoqualmie, Suquamish, and Tulalip tribes on June 26, 2018. The assessment included background research using sources such as geotechnical reports, public records, and historic maps and resources to develop a full of the history of land use and archaeological potential in the project area. The conclusions and recommendations of the Cultural Resource Assessment include the following: "Parcel history, geotechnical borings, and nearby monitoring indicate that at least 4 to 7 feet of recent fill, and possibly more, are present in the study area. Groundwater is likely present at around 10 feet, representing a likely lower boundary of occupation or use. Native sediments could be present between 4 and 10 feet below the surface. Archaeological potential, however, is low to moderate. The native ground surface may have been removed by the cleanup, if not by prior industrial activity. However, the presence of historical artifacts at 12 feet below the surface on the adjacent parcel indicates that some potential remains. The footprint of ground disturbance deeper than 4 feet below the surface is limited to the eight auger -cast piles that form the foundation for the two tie - downs for the project. If possible, given "construction methods, archaeological monitoring should occur at those locations, to comply with TMC 18.50.110. An archaeological monitoring plan should be developed and provided to DAHP and interested Native American Tribes. An Inadvertent Discovery Plan should also be 12 Shoreline Substantial Development July 19, 2018 developed, to guide actions in the event that archaeological materials are encountered when the monitor is not on site." DAHP staff submitted a follow-up letter dated July 12, 2018 (See Attachment 8) to the City stating they have reviewed the report and concur with the recommendation that ground disturbance for the project be monitored by a professional archaeologist under an archaeological monitoring and inadvertent discovery plan (MDIP) reviewed by DAHP and the Tribes. DAHP also requested that an MDIP be prepared and submitted to DAHP and the Tribes for review prior to ground disturbance and monitoring. The Assessment report's and DAHP recommendations will be included as a condition of approval of this permit. 7. SEPA AND OTHER CITY APPROVALS An Environmental Checklist was submitted for the B-52 Memorial Park proposal (E16-0001) and a Notice of Decision was issued approving the proposal as a SEPA Planned Action on March 10, 2016. A Shoreline Tree Removal and Vegetation Clearing permit (L18-0030) was approved for this project on July 17, 2018. The applicant must obtain a building permit for park structures. 8. RECOMMENDATION Approval of the shoreline substantial development permit with the following condition: 1. Per the conclusions and recommendations of the Cultural Resource Assessment conducted for this project, the following actions are required: a. Develop and distribute an archaeological monitoring plan to DAHP and interested Native American Tribes prior to ground disturbance and monitoring. b. A professional archaeologist who meets the Secretary of the Interior standards for Professional Archaeology shall be on site to monitor excavation and placement of the eight auger -cast piles that form the foundation for the two tie -downs. c. Develop an Inadvertent Discovery Plan to guide actions in the event that archaeological materials are discovered when the monitor is not on site. 13 e following project and permit City of Tukwila Allan Ekberg, Mayor Department of Community Development - Jack Pace, Director July 17, 2018 STAFF REPORT AND NOTICE OF DECISION TO: Elias Gardner, Applicant, SRG Washington State Department of Ecology Washington State Department of Fish and Wildli King County Department of Assessments This letter serves as a Notice of Decision and is issued pur approval. Proiect File Number: Applicant: Type of Permit Applied for: Project Description: Location: Associated Files: Comprehensive Plan Designation/Zoning District: REVIEWED FOR CODE COMPLIANCE APPROVED DEC 122018 isot2Nri"r I. PROJECT INFORMATION L18-0030 Elias Gardner, SRG Partnership, Inc. Shoreline Tree Removal and Vegetation Clearing Proposal is to remove and replace 13 trees within the shoreline jurisdiction on the proposed B-52 Memorial Park site. King County Parcel # 5729800010 L18-0031 Shoreline Substantial Development RECEIVED CITY OF TUKWILA JUL 2 3 2018 PERMIT CENTER Manufacturing Industrial Center/Heavy Industrial (MIC/H) II. DECISION ti REVISION NO,..L, SEPA Determination: An Environmental Checklist was submitted for the B-52 Memorial Park proposal (E16- 0001) and a Notice of Decision was issued approving the proposal as a Planned Action on March 10, 2016. Decision on Substantive Permit: The Community Development Director has determined that the special permission application does comply with applicable City and State code requirements and has approved that application, subject to the following conditions: 1 DN- 00`6 1. Applicant shall plant at least 23 of the required 80 replacement trees on-site per approved plans. Payment into the City's Tree Fund is allowed for up to 57 replacement trees. At the time of this writing, the fee per replacement tree is $124.00; this fee is subject to change. At the time of initial planting inspection associated with the building permit, payment into the City's Tree Fund will be at the rate codified/in place at the time of inspection. 2. Trees may be planted between October 15th and April 15th; this ensures the best start for tree health and retention for the mitigation monitoring period and beyond. Trees shall be planted after construction of the B-5 Park, as construction equipment has the potential to damage newly planted trees. 3. Trees should be watered weekly during the dry months (generally July -September or as necessary depending on conditions) for the first two growing seasons or until the plants are established. 4. Applicant shall submit annual photos of all 23 replacement trees to the City's Urban Environmentalist (. „ ,. :) to ensure proper maintenance and a 100% survival rate for three years following the initial landscape inspection. 5. Per TMC 18.44.080.B.5, the property owner is required to ensure the viability and long-term health of trees planted for replacement through proper care and maintenance for the life of the project. Replaced trees that do not survive must be replanted in the next appropriate season for planting. 6. Topping of trees is prohibited (unless absolutely necessary to protect utility lines) and will be regulated as removal requiring tree replacement. 7. Contact the City's Urban Environmentalist (-,adr :.: . , .:, r,.t A.,.: .) fora post -construction inspection of protected trees. All corrective or reparative pruning must be conducted by a Qualified Tree Professional. III. FINDINGS This tree clearing permit application is to remove 13 trees within the shoreline jurisdiction along the southern border of the proposed B-52 Bomber Memorial Park site. The subject trees include 11 Lombardi poplars and two native Bitter cherries, ranging from 25 feet to 85 feet in height and 8 to 26 inches in diameter at 4.5 feet from the ground. Three trees were previously topped at 35 feet, and two trees are diseased and considered not viable. Per TMC 18.44.080.B, 80 replacement trees are required, which was determined based on the number and size of trees removed. The applicant is proposing planting 23 of the required replacement trees on site. Several options were considered to increase the number of replacement trees planted on site, including adding trees to the eastern portion of the site, screening the trailers on the south side of the property, or adding trees in large planters that could' be moved, if needed. Per the applicant, these options conflicted with project goals of maintaining visibility of the military bunch flags, sculpture, and the aircraft, as well as operational requirements of the site. The trees to be planted on site include a native mix of Western Red Cedar, Cascara, Shore Pine, and Oregon Ash. An irrigation system is included to ensure the viability and long-term health of the replacement trees. An existing tree located close to the park on the adjacent parcel to the south will be retained and its critical root zone protected during construction. Payment into the City's Tree Fund is allowed for up to 57 replacement trees. At the time of this writing, the fee per replacement tree is $124.00; this fee is subject to change. At the time of initial planting inspection associated with the building permit, payment into the City's Tree Fund will be required at the rate codified/in place at the time of inspection. 2 II IV. YOUR APPEAL RIGHTS The Decision on this Permit Application is a Type 2 decision pursuant to Tukwila Municipal Code §18.104.010. Other land use applications related to this project may still be pending. One administrative appeal to the Hearing Examiner of the Decision on the Permit itself is permitted. A party who is not satisfied with the outcome of the Hearing Examiner appeal process may file an appeal in King County Superior Court from the Hearing Examiner's decision. IV. PROCEDURES AND TIME FOR APPEALING In order to appeal the Community Development Director's decision on the Permit Application, a written notice of appeal must be filed with the Department of Community Development within 14 -days of the issuance of this Decision, that is by July 31, 2018. The requirements for such appeals are set forth in Tukwila Municipal Code 18.116. All appeal materials shall be submitted to the Department of Community Development. Appeal materials MUST include: 1. The name of the appealing party. 2. The address and phone number of the appealing party; and if the appealing party is a corporation, association or other group, the address and phone number of a contact person authorized to receive notices on the appealing party's behalf. 3. A statement identifying the decision being appealed and the alleged errors in the decision, including any specific challenge to an MDNS. 4. The Notice of Appeal shall identify (a) the specific errors of fact or errors in application of the law in the decision being appealed; (b) the harm suffered or anticipated by the appellant, and (c) the relief sought. The scope of an appeal shall be limited to matters or issues raised in the Notice of Appeal. 5. Appeal fee per the current fee schedule, additional hourly charges may apply. In addition, all hearing examiner costs will be passed through to the appellant. V. APPEAL HEARINGS PROCESS Any administrative appeal regarding the Permit shall be conducted as an open record hearing before the Hearing Examiner based on the testimony and documentary evidence presented at the open record hearing. The Hearing Examiner decision on the appeal is the City's final decision. Any party wishing to challenge the Hearing Examiner decision on this application must file an appeal pursuant to the procedures and time limitations set forth in RCW 36.70C. An appeal challenging a DNS, an MDNS or an EIS may be included in such an appeal. If no appeal of the Hearing Examiner decision is properly filed in Superior Court within such time limit, the Decision on this permit will be final. The City's decision to issue a DNS, an MDNS or an EIS is final for this permit and any other pending permit applications for the development of the subject property. 3 VI. INSPECTION OF INFORMATION ON THE APPLICATION Project materials including the application, any staff reports, and other studies related to the permits are available for inspection at the Tukwila Department of Community Development, 6300 Southcenter Blvd., Suite 100, Tukwila, Washington 98188 from Monday through Friday between 8:30 a.m. and 5:00 p.m. The project planner is Lynn Miranda, who may be contacted at 206.433.7162 for further information. Property owners affected by this decision may request a change in valuation for their property tax purposes. Contact the King County Assessor's Office for further information regarding property tax valuation changes. The notice board must be removed at the expiration of the appeal period if no appeal is filed. 13.t.- ILL v Jack lace, Director Department of Community Development City of Tukwila 4 Museum of Flight B-52 Park Landscape Maintenance Guidelines B-52 Park Landscape Maintenance Guidelines March, 2018 Overall Objectives • Ensure a healthy, thriving and beautiful landscape throughout the year. Provide regular and thorough maintenance of all landscape areas. Proactively address horticultural issues such as nutrition, drainage, irrigation, pests and weeds before they become problems. Keep all landscape areas free of trash, litter and weeds. Maintain the integrity of the original planting concept, while allowing for evolving cultural condi tions. Planting Concept Memorial: Planting around the memorial is meant to be decorative and to highlight the structures and sculptures associated with the memorial. This includes a mounded lawn with an ornamental grass buffer. Aircraft Field: A hand seeded native seed mix will grown to be a medium hegiht and colorful wildflower meadow. The perimeter tree lanting is meant to be a buffer to the adjacent properties, and a native hedgerow that will provide wildlife habitat. Planting Systems Overview Planting Soils: Soil in all areas consists of a standard bioretention mix, which consists of two parts medium compost and three parts mineral aggregate (sand). Mulch: • Memorial: Shrub plantings at the memorial are mulched with medium compost. The compost should be maintained such that it is lightly compacted, while still allowing for adequate drainage and aeration. Meadow: During seeding, a sawdust carrier will be laid down with the seed. Jute mesh fabric will be applied to the entire area afte CORRECTION LTR# D 1 8% se WEWED FOR CODE COMPLIANCE. APPROVED DEC 12 2018 City of Tukwila BU DI ► G D . I 1 1 RECEIVED CITY OF TUKWILA JUN 042018 PERMIT CENTER Museum of Flight B-52 ParkLandscape Maintenance Guidelines Irrigation Systems: • Automatic irrigation system will use existing point of connection installed during phase 1. Reuse existing remote control valves and pop-up spray heads. New heads MP rotator heads required for memorial planting area. Coupler MATCHLINE SEE L4.10 . , lT1 Quick Coupler \\ 42-52. \ MATCHLINE SEE L4.10 112. %" IRRIGATION SCHEDULE SYMBOL MANUPAn�wm Mn.00EEecsrwN PSI 00© .e1 PROD "'PIS'SCV 40 TM141e104, x(1621 an) ropupMN e.arM. .m....M Rn P..1. MVR.4 NOTE, nay. en PR2140 WO. M41Y000.4.e 0010:10. 1.41.101013. Mb 010 me. 0401. SM R I SALVAGE AND REUSE 400011NG IRRIGATION HEWS AND nurowe VALVES. ] CONNECT NM10Am1 SYSTEM TO EMSTNG P O.0 ASSEMBLY 1. 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L-: PVC G. 200 SOHO, N..1on Ma..: PVC Sw...0 POD M..: PVC 940..1.40 an 4 4114112•110n Maend Y BMW .E Museum of Flight B-52 Park Landscape Maintenance Guidelines Maintenance Protocols Schedule: • Frequency and type of maintenance visits shall be determined in agreement with the Property Manager, so as to ensure a clean and attractive landscape at all times. Roof -level planting beds shall be maintained at least twice per month between April and October and once per month between November and March. Additional maintenance may be required to ensure a clean and attractive amenity space. General Tasks: The contractor shall remove from the site all litter, debris and dead plant material on each visit. The contractor shall monitor plant health, soil moisture and damage to plants and property on each visit and take immediate and proactive action to correct any observed issues. The contractor shall provide a monthly report to the Property Manager, detailing all plant losses, relevant warranty coverage; damages to planting, irrigation and other property; and any other issues that may need to be addressed. Irrigation: • Always ensure that plants are receiving adequate—but not excessive—irrigation. Do not allow plants to wilt. Regular inspection of plant health and growth should ultimately determine appropriate levels of irrigation. o Duration of manual irrigation and automated schedules should be adjusted accordingly. • Avoid over -watering. o On the roof, excessive irrigation will rapidly deplete nutrients from the free -draining soil. o In the right-of-way tree pits, excessive irrigation can create anaerobic soil conditions. Soils should be moist, but not saturated. ❑ Moist soils will maintain vital microbial activity in the soil, even in the initial years when the tree roots have not extended throughout the suspending paving system. After installation, the rootballs of street trees should be irrigated daily for the first month, every other day for the next 3 months and weekly thereafter until established—typically for a full year. o For 3" caliper street trees, apply 6 gallons of water to the mulched area of the planting pit during each irrigation session. o Do not irrigate if soils are saturated. • After establishment, trees should be irrigated as needed during times of drought or stress. • Use a visual inspection to ensure that water is distributed appropriately. Do not rely solely on automated systems. Supplement with hand irrigation, as necessary. • The contractor will monitor irrigation systems to maintain proper functioning. Irrigation repairs or concerns should be immediately brought to the attention of the Property Manager. • The contractor will hand -water plants when and where necessary, including during any dry winter periods when automated systems are winterized or otherwise not performing adequately. • Irrigation system springtime activation maintenance includes: Museum of Flight B-52 ParkLandscape Maintenance Guidelines o Pressurize system: inspect for water leaks, faulty valves and broken heads. o Adjustment of heads for proper coverage as necessary. o Turn on controller, set program times and durations as necessary. o Property Manager shall be advised of springtime system repairs. Services shall be billed on a time -and -materials basis upon approval by the Property Manager. Irrigation system operation maintenance includes: o Adjust irrigation controller to operate after hours, preferably in the early morning. o Inspect planting areas throughout the growing season and adjust controller to correct over- and under -watering. o Adjust heads as necessary to ensure adequate coverage. Irrigation system winterization includes: o Blow out irrigation lines with power air compressor. o Open manual drain valves. o Set irrigation controller on standby. o Turn off main water valve and drain water from DCVA. • Irrigation backflow valve assembly inspection: o Service as necessary. Plant Nutrition: • In general, fertilizing should be kept to a minimum, and implemented only when necessary to correct nutrient deficiencies in planter soil, as indicated by soil analysis or by informed observation When applicable, contractor should perform seasonal fertilization using a granular slow- release product, unless results of soil testing indicate otherwise. Spot fertilizing will occur on an as -needed basis. o Excessive fertilization can lead to excessively lush growth that makes plants vulnerable to pests. Healthy plant growth is slow and steady, as appropriate to each species. Plant Pest and Disease Control: • The contractor must use IPM (Integrated Pest Management) practices in dealing with insect or disease infestations. Organic and cultural methods are the first line of defense, with an emphasis on prevention and pro -active management. o Diluted Dr. Bronner's Peppermint Castille Soap, neem oil and ladybugs can be used for aphid control on an as needed basis. Horticultural soaps and neem oil should not be used when temperatures exceed 85F. o When necessary, SLUGGO-based slug meal can be used to control slugs, carefully applied in areas where slug damage is evident. The last line of defense is chemical, applied by a licensed applicator only, with specific timed and limited use to target pests. Broad-spectrum pesticides are not used on a quarterly application or over a widespread area. Prior to applying any chemicals, Property Manager's approval is required. Museum of Flight B-52 Park Landscape Maintenance Guidelines Weed Control: The contractor must use an IPM strategy to address weed control. The primary method is manual removal. Inspection for weeds should occur every two weeks during the growing season and monthly in the winter. Weeds must be removed promptly. Under no circumstances should weeds remain long enough to set seed. Opportunities for weed establishment can be minimized by ensuring complete coverage of the planting soil with plants. Plant Replacement: • In general, declining or dead plants should be replaced immediately to ensure a healthy - looking landscape at all times. o Plants should be replaced with the same species and/or cultivar and in the same quantities and locations. o Replacement plants should be secured before plants are removed. o For plants that are not readily available from local sources, make arrangements to secure plants from mail order sources or through an appropriate plant broker. - The landscape architect, Site Workshop (206-285-3026), can also provide suggestions for plant sources. o Exceptions to in-kind plant replacement can be made with approval of the property manager only when a particular plant fails repeatedly due to a demonstrated cultural incompatibility. First verify that cultural problems cannot be corrected by other means, submitting soil and/or plant tissue to an appropriate lab for analysis. o Submit suggestions for alternate replacements for approval of the property manager. - Alternate replacements must be hardy in USDA zone 8; must be well -adapted to lower -nutrient, well -drained soil with limited irrigation; must provide similar aesthetic qualities to the plants they are replacing. Variegated plants are not acceptable under any circumstances. Management of Street Trees: • • Street trees should be pruned only by a certified arborist, only when necessary and according to ANSI A300 Pruning Standards. o Topping, flush cuts and stub cuts are not acceptable. o Pruning should not be used as an attempt to reduce the size of the tree, but only to shape its growth. Pruning should be proactive to minimize the size of wounds caused by cut limbs. Tree limbs should be maintained such that they do not interfere with pedestrian or vehicular traffic. The property and adjacent right-of-way should be kept clear of leaf litter and other tree debris. o Use of leaf blowers must be scheduled with and approved by the Property Manager to minimize conflicts with building operations. Museum of Flight B-52 ParkLandscape Maintenance Guidelines PLANT SCHEDULE TREES CODE BOTANICAL NAME COMMON NAME SIZE QTY ANNUALS/PERENNIALS CODE BOTANICAL NAME COMMON NAME CONT QTY * II Me douglml®m Douglas Ids 1 gel. 32 AS Amesnehiar eloftle Servimberry mux o12.5', 2.75', 3' 11 [3 SC Salvia nenmoea'CaredorneCardona Perennial SAoo 1 gr. 27 CR Cretaegue daoglo&I River Hawthorn me of 2.5', 2.75', 3' 9 BULBS CODE BOTANICAL NAME COMMON NAME CONT QTY FL Frexlnua Wider Oregon Aeh 3' cal. 6 AM Allium O'Millenium' Mglenium Ornamental Chive Bulb 50 MP Melee fuses Oregon Crab APPe mix o12.5'. 2.75', 3' 13 GRASSES CODE BOTANICAL NAME COMMON NAME COM CITY PC Pinus oonmrm'Conbb' Shore Pen 8'-10' ht4 0 CO Carex & ropte Slough Sedge 1 gel 36 RP Rhemmm ensnare Cascara me o12.5', 2.75', 3' 12 OT Desdrempsie coopilose Tufted Heir Gress 1 gat 32 TP Thula Peseta Western Red Ceder 10'-12' ht. 3 Q JT Juno. lends Poverty Rush 1 gel. 51 CODE BOTANICAL NAME COMMON NAME CONT OTY 0 5A Sellers auesnnds Autumn Moor Gress 1 gel 67 CP2 Chert se 0iifdius 'Pmssa5r' Segesef Rocboea 2 gal. 18 Pruning, Cutting Back & Plant Removal: • All plants will be allowed to develop their natural form. Hedging or other types of shearing are not acceptable. • Spent flowers should be removed to encourage continued blooming. • Dormant perennials should be left in place until the last week of February, at which time they should be cut back and removed from the site before new growth resumes. • Spent foliage should be gently combed from evergreen grasses and removed from the site. • Deciduous grasses should be cut back to a height of 6 inches during the last week of February. Initially installed plants (such as Eschscholzia californica) should be allowed to reseed themselves throughout the landscape. Reseeded plants can be removed periodically to prevent outcompeting other plants or otherwise becoming dominant in planting beds. All dead, diseased or damaged plant material, including clippings and other debris, shall be removed promptly from the site, using a route approved by the Property Manager and without interfering with building operations. Annotated Plant Schedule. Cost Control The contractor shall: • Be expected to bring proposals and ideas for landscape improvements to the attention of Property Manager or Owner at any time for review. Museum of Flight B-52 Park Landscape Maintenance Guidelines Maintenance contractor to review plant health and survival on an ongoing basis. Contractor to provide the property manager with proposals and costs of plant replacements monthly. Perform no work requiring additional compensation without prior written approval from the Property Manager. Exceptions include emergency repair of irrigation components and/or other issues that present immediate safety concerns or that may further damage property. o Immediately repair or remedy any such emergency and maintain record of repairs in a monthly report to the Property Manager. o Immediately inform Property Manager of work completed or in progress and present a record of work completed and associated costs. Warranty • The contractor guarantees installation of all plant materials for a period of twelve (12) months. The contractor shall replace, at no additional cost to the Owner, plant materials damaged as a result of improper maintenance attention or procedures. Replacement material shall be of the same size and variety as the removed material unless indicated otherwise by the Owner. The contractor shall inform the Property Manager on a monthly basis of all plant losses, regardless whether covered by guarantee or unrelated to the maintenance activities. Provide the Property Manager with the cause of the plant loss and recommendations with pricing for replacement, as well as for addressing the underlying cause of failure, if necessary. The contractor is not responsible for losses, repair or replacement of damaged work or plant material resulting from theft, uncharacteristically extreme weather conditions, fire, earthquakes, vandalism, vehicular incidents (other than contractor's vehicles), or the acts of others over whom the contractor has no reasonable control. Museum of Flight B-52 ParkLandscape Maintenance Guidelines MAINTENANCE CALENDAR Monthly Tasks RAKING Lawn // Rake clear debris 2x per month. All Plants // Weed all plants 2x per month in spring through fall growing season. ANNUAL TASKS FERTILIZER IN MID FEBRUARY AND JULY All Shurbs & Grasses // Apply a slow-release granular fertilizer. SHEARING IN LATE FEBRUARY -Carex obnupta // Trim back second week in February. -Sesleria autumnalis // Light/ selective trimming second week in February. -Deschampsia caespitosa //Trim back second week in February. WEED CONTROL River Cobble, Stone Mulch, Glass Mulch & flagstone // Weed and remove debris lx per month. REMOVE DEBRIS Catch Basins // Remove debris 2x per month. • ipp CHECK SOIL PH LEVELS IN MARCH Green Roof Sedum Mix // Check pH levels and apply fertilizer each year as needed. CLEANING Steel Edging, Metal Railings and Memorial Plaques // Clean powder coated surfaces minimum 1x per year or more as needed. WASH PAVEMENT IN SUMMER Concrete Paving // Power wash pavers minimum once per year. CHECK DRAINS IN OCTOBER Existing and New Drains // Inspect drainage structures minimum 1x per year for proper flow and clear debris from all clogged drains. WINTERIZE IRRIGATION IN OCTOBER /NOVEMBER Irrigation // Winterize system by early November. Museum of Flight B-52 Park Landscape Maintenance Guidelines ILLUSTRATIVE SITE PLAN SITE PLAN 1. GRAVEL PAVING 2. CONCRETE PAVING 3. FLAGS AND SCULPTURE 4. TRIBUTE WALL 5. LARGE DONOR SIGN 6. WETLAND 7. MEADOW 8. LAWN FILE STORMWATER TECHNICAL INFORMATION REPORT B-52 Memorial Park Phase 2 Tukwila, Washington May 25, 2018 CORRECTION LTR# Dib-ooss FkE VIEWEL CODE COMPLIANCE APPROVED DEC 12 2018 City of Tukwila BUILDING DIVISION RECEIVED CITY OF TUKWILA JUN 04 2018 PERMIT CENTER ■ MAGNUSSON KLEMENCIC ASSOCIATES 1301 Fifth Avenue, Suite 3200 Seattle, Washington 98101-2699 Ti 206 292 1200 F: 206 292 1201 MAGNUSSON KLEMENCIC ASSOCIATES SFCTION 1: PROJECT OVERVIEW SECTION 2: CONDITIONS AND REQUIREIMENTS SUMMARY SECTION 3: OFF-SITF ANALYSIS SECTION 4: FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN SECTION 5: CONVEYANCE SYSTEM_ANJZANALYSIS DESIGN SECTION 6 SPECIAL RFPORTS AND STUDJES SECTION 7. OTHER PERMITS SECTION 8: CONSTRUCTION STORMWATER POLLUTION PREVENTION PLAN ANALYSIS AND DESIGN SECTION 9: BOND QUANTITIES WORKSHEET, RETENTION/DETENTION FACILITY SUMMARY SHEET AND DECLARATION OF COVENANT SECTION 10: OPERATIONS AND MAINTENANCF MANUAL FIGURES APPENDIX Stormwater Technical Information Report B-52 Memorial Park Phase 1, Tukwila, Washington 1 2 4 4 5 5 5 5 9 9 Table of Contents MAGNUSSON KLEMENCIC ASSOC ATES SECTION 1 • PROJECT OVERVIEW INTRODUCTION This report documents the stormwater and drainage design approach and proposal for the Museum of Flight (MOF) B-52 Memorial Park Phase 2 Project (Park). The report has been prepared using the 2016 King County Surface Water Design Manual (KCSWDM) as a general guideline for this abbreviated Stormwater Technical Information Report (TIR). In some cases, the information requested in the KCSWDM is specific to permitting in King County. Requested information that is directly related to work in King County has been omitted from this TIR. The project is located in the City of Tukwila directly southwest of Raisbeck Aviation High School (9229 East Marginal Way South), north of S 94th Place, in the southwestern -most portion of Parcel Number 572980-0010. See Figure 1-1 for a vicinity map showing the location of the site. The project site is currently owned by the Museum of Flight and was formerly owned by Container Properties. Work on the site will be completed in two phases. Phase 1 of the Park project, completed in Summer 2016, included the reconfiguration of the existing adjacent parking, the removal of asphalt pavement, the development of lawn areas, installation of an irrigation system, a new water service for irrigation, and the installation of a pervious gravel area for picnic tables. No significant grading was done for Phase 1. There have been no further site improvements since the completion of Phase 1. The scope of work for Phase 2 will create a landscaped area of natural vegetation, plantings, gravel pathways, and a raised concrete plaza mound with a commemorative statue and flagpoles. All of these improvements are part of an exhibit for a restored B-52 aircraft. The project will also include foundations to support the aircraft, irrigation and lighting and removal of trees. The Phase 1 and 2 work were approved as a Planned Action in March 2016. Because this is a phased development, the land cover prior to the start of the Phase 1 improvements is considered the predeveloped condition for the purposes of this TIR. A copy of the TIR worksheet is provided in Appendix 1 of this report. EXISTING DRAINAGE Prior to the commencement of Phase 1, the site was entirely impervious consisting of asphalt or concrete paving and compacted soil and gravel surfacing. Aerial images dating as far back as 1990 show that this site has been impervious since at least that time. A portion of the site currently drains to an existing on-site conveyance system on the on the Raisbeck Aviation High School property. The system discharges to the Duwamish River through an existing 36 - inch outfall, owned by King County, at the northeast corner of Slip 6. This conveyance system was installed during the construction of Raisbeck Aviation High School. This conveyance system connects to an existing storm drain system that includes the King County outfall on the high school site. This system includes a water quality treatment device (StormFilter), installed by the high school project, that treats the pollution -generating impervious surfaces created by that project. The King County outfall also collects discharge from adjacent properties on the west side of East Marginal Way South as well as a portion of the runoff from the King County International Airport. Stormwater Technical Information Report B-52 Memorial Park Phase 2, Tukwila, Washington MAGNUSSON KLEMENCIC ASSOCATES E The remainder of the site has no collection or conveyance system and discharges as overland flow to the adjacent properties. The site drainage area, site characteristics, and the existing storm drain conveyance system are shown in Figure 1-2. PROPOSED DRAINAGE The Phase 1 improvements maintained the existing drainage system and catchment areas draining to the existing conveyance systems. No new conveyance systems were installed. Phase 2 will continue to maintain all existing drainage systems and there are no proposed drainage improvements. Overall peak flow rates will be reduced as a result of the reduction in impervious surfaces. SOILS King County Soil Survey maps are not available at the project site, as soils in urban areas are considered highly variable. Borings taken around the project site indicate the soils within 30 feet of the surface consist mainly of surficial fill overlying granular alluvial deposits. The geotechnical engineer has classified the fill as primarily medium -dense silty sand with some gravel, while the granular alluvial deposits consist of loose to medium -dense sand to silty sand. Based on explorations at neighboring downstream properties during Phase 1 improvements, the geotechnical engineer anticipates thicker silt layers at depths beyond 30 feet. Per the 2016 Surface Water Design Manual's Table 3.2.2.A, Tukwila is classified as SCS Hydrologic Soil Group "D," which shall be modeled as till soils. SECTION 2• CONDITIONS_ANQ RFOUJREMFNTS SUMMARY SITE CONDITIONS • The site disturbance within the Phase 2 limits of work is 0.83 acres as shown on Figure 2-1. Areas of Phase 2 were previously disturbed for the Phase 1 work. • The existing pervious and impervious areas, prior to Phase 1, within the Phase 2 limits of work, are 0.06 acres and 0.88 acres respectively. See Figure 2-2. • The proposed pervious and impervious areas, after the completion of the Phase 2 work, within the Phase 2 limits of work are 0.60 acres and 0.33 acres respectively. See Figure 2-3. This represents an increase to the pervious area, and corresponding decrease to the impervious area, of 0.55 acres. • Prior to the Phase 1 work, the existing pollution -generating impervious surface area within the site disturbance area was 2,571 square feet (0.06 acres). All pollution -generating impervious surface areas within the site disturbance area were removed as part of the Phase 1 work. There are no pollution -generating surfaces proposed for Phase 2. CORE REQUIREMENTS Evaluation of the project with respect to the Core and Special Requirements is outlined below. Stormwater Technical Information Report B-52 Memorial Park Phase 2, Tukwila, Washington MAGNUSSON KLEMENCIC ASSOC ArES Core Requirement 1: Discharge at the Natural Location The drainage from the site disturbance area will maintain existing unconcentrated flow patterns. Flows will continue to drain to the existing off-site systems on the Container Properties site and Raisbeck Aviation High School, which eventually discharge to outfalls at the Duwamish River. Core Requirement 2: Off -Site Analysis Not applicable. The proposed development reduces the impervious surface and as a result there is no adverse change to the rate, volume, duration, or location of discharges to and from the site. Core Requirement 3: Flow Control Not applicable. The project is within the Duwamish River Basin and discharges via a closed conveyance system, with adequate capacity, to a point below River Mile 6, and is therefore exempt from the flow control requirement per the Direct Discharge Exemption. Core Requirement 4: Conveyance System There are no new conveyance systems required for this project. Existing on-site conveyance lines have not been analyzed since there is a decrease to the to the peak flow rate as a result of the decrease in impervious area within the site disturbance area. Core Requirement 5: Construction Stormwater Pollution Prevention A Temporary Erosion and Sedimentation Control (TESC) plan has been prepared for the project and SWPPS measures discussed in Section 8. Core Requirement 6: Maintenance and Operation Not applicable. There is an existing water quality treatment facility outside the project limits of work on the Raisbeck Aviation High School site (see Figurel -2). Maintenance and operation of this facility is by the high school. Core Requirement 7: Financial Guarantees and Liability Not applicable. This is a requirement specifically related to work in unincorporated King County. Additionally, no drainage facilities will be constructed or modified during this project. Core Requirement 8: Water Quality There will be no new or replaced pollution -generating impervious surfaces in Phase 2. Additional water quality treatment beyond what currently exists on the high school site is not required. Pollution - generating impervious surface areas were reduced as a result of the removal of asphalt paved parking areas in Phase 1. Stormwater Technical Information Report B-52 Memorial Park Phase 2, Tukwila, Washington MAGNUSSON KLEMENCIC ASSOC ATES Core Requirement 9: Flow Control BMPs The proposed development qualifies for the Direct Discharge Exemption and does not include roof surfaces; Basic Dispersion must be considered for feasibility to meet this requirement. A minimum 10 - foot vegetative flow path is available in some areas for sheet flow from the new surfaces. Gravel strips are not required for pathways less than 10 feet wide. Surfaces where flows cannot be directed to vegetated areas via gravity are considered infeasible for Basic Dispersion. Additionally, two pathways have been designated as permeable pavement; see Figure 2-4. SPECIAL REQUIREMENTS Special Requirement 1: Other Adopted Area -Specific Requirements Not applicable. Special Requirement 2: Flood Hazard Area Delineation Not applicable. The project site appears on the National Flood Insurance Rate Map, dated May 16, 1995, Community Panel No. 53033C0645F, and is situated in Zone "X," an area determined to be outside the 500 -year floodplain. Special Requirement 3: Flood Protection Facilities Not applicable. There are no flood protection facilities on the project site. Special Requirement 4: Source Controls Not applicable. There will be no storage of pollutant material outdoors. Special Requirement 5: Oil Control Not applicable. The project is not a high -use site. SFCTION 3• OFF-SITE ANAI_YSJS Not applicable,per exemptions described in Section 2, Core Requirement 2. SECTION 4. FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN Flow control analysis and design is not applicable. At the completion of Phase 2 the project will reduce the impervious surface within the site disturbance area. Water quality facility analysis and design is not applicable. During Phase 1, the project reduced the pollution -generating impervious surface within the site disturbance area. There are no new pollution - generating impervious surfaces proposed for Phase 2. Stormwater Technical Information Report B-52 Memorial Park Phase 2, Tukwila, Washington MAGNUSSON KLEMENCIC ASSOC'.ATES C SECTION 5• CONVEYANCE SYSTFM ANALYSIS AND DESIGN Not applicable. There are no changes proposed to the existing conveyance systems as discussed in Section 2, Core Requirement 4. SECTION 6• SPECIAL REPORTS AND STUDIES Not applicable. SECTION 7• OTHER PERMITS The following permits apply to this project: ■ Shoreline Substantial Development Permit ■ Building Permit ■ Tree Permit SECTION 8: CONSTRUCTION STORMWATER POLLUTION • . IL 16.1 _ . I 1 TESC REQUIREMENTS A TESC Plan has been prepared for the project and is included in this report as Figure 8-1. The plan will meet the minimum TESC requirements as discussed below. TESC Requirement 1: Clearing Limits Tree clearing and protection are identified on the landscape drawings. There is no planned pavement removal. TESC Requirement 2: Cover Measures Cover measures will be addressed in the TESC Plan Notes. TESC Requirement 3: Perimeter Protection A compost filter sock has been indicated at the grading/demolition limits. TESC Requirement 4: Traffic Area Stabilization Stabilization will be provided by the existing pavement. The TESC Plan Notes will indicate that State water quality standards are applicable to construction site runoff. TESC Requirement 5: Sediment Retention Sediment retention in the form of catch basin inserts has been indicated. Stormwater Technical Information Report B-52 Memorial Park Phase 2, Tukwila, Washington MAGNUSSON KLEMENC[C ASSOC 'AtES TESC Requirement 6: Surface Water Collection Compost filter socks have been shown on the plans. TESL Requirement 7: Dewatering Control Not applicable. No dewatering utilities are anticipated for this project. TESC Requirement 8: Dust Control Air quality will be addressed in the TESC Plan Notes. TESC Requirement 9: Flow Control Additional flow control not required. The proposed development reduces the total impervious surface and will decrease runoff peaks during construction. TESC Requirement 10: Control Pollutants Pollutant controls will be addressed in the TESC Plan Notes. TESC Requirement 11: Protect Existing and Proposed Flow Control BMPs Not applicable. The project limits of work do not include existing or proposed flow control devices. TESC Requirement 12: Maintain BMPs Project specifications and TESC notes require ongoing maintenance of BMPs. TESC Requirement 13: Manage the Project Project specifications require streamlined management of project BMPs STORMWATER POLLUTION PREVENTION AND SPILL PLAN DURING CONSTRUCTION Best management practices (BMPs) to prevent pollution from construction activities, in addition to the TESC requirements, shall be implemented during construction. These BMPs are based on the activity sheets in the 2016 King County Stormwater Pollution Prevention Manual for commercial, industrial, agricultural, public, and multifamily residential activities. Activity Sheet A-4 — Storage of Soil, Sand, and Other Erodible Materials ■ Cover and contain the stockpiles of raw materials to prevent stormwater from washing material to surface waters or a storm drainage system. The covers must be in place at all times when the stockpile is not in active use. Do not hose down the contained stockpile area to the storm drainage system. Stormwater Technical Information Report B-52 Memorial Park Phase 2, Tukwila, Washington MAGNUSSON KLEMENCIC Assoc+ATes • Stockpiles located away from paved areas or where material will not be washed or tracked to the storm drainage system may not need to be covered unless windy conditions cause airborne particulate that could settle on hard surfaces and subsequently be washed into adjacent surface waters or storm drainage systems. • If the stockpiles are so large that they cannot feasibly be covered and contained, implement erosion control practices at the perimeter and as needed on site to prevent erosion and runoff of the stockpiled material into the storm drainage system or off site. See the King County Surface Water Design Manual, Appendix D (Erosion and Sediment Control Standards). • Required routine maintenance: — Sweep paved storage areas as needed and collect and dispose of loose solid materials. Do not hose down the area to a storm drain or ditch. — Stock cleanup materials, such as brooms, dustpans, and vacuum sweepers near the storage area. Activity Sheet A-11 – Cleaning or Washing of Tools and Equipment • Tool and equipment wash water is considered process water, and must discharge to the sanitary sewer, a holding tank, or a process treatment system, regardless of the washing method used. • You are encouraged to recycle your wash water with an enclosed loop system or use self-contained parts washers. Numerous products are commercially available that recycle and contain wash water and cleaning solvents. • If you cannot connect discharges to a sanitary sewer, process treatment system, or holding tank, you must contact the Washington State Department of Ecology and go through the Individual Wastewater Discharge permit process. • Lawnmowers may be rinsed with water only on a lawn or similar area as long as the rinsed -off grass clippings will not be washed to the storm drain system or surface waters when it rains. Wash water from oily or similarly contaminated lawn maintenance equipment is not allowed to flow to or discharge to any stormwater system or surface water. Activity Sheet A-20 – Concrete and Asphalt Application • Sweep parking lots, storage areas, and driveways as needed to collect dirt, waste, and debris. Do not hose down the area to the storm drainage system. • Cover and contain all nearby storm drains at the beginning of the workday. Drain covers and other containment devices are commercially available to keep runoff out of the storm drainage system. All solids collected must be disposed of properly at the end of the workday (or more frequently) prior to removing the containment or cover device(s). • Contain and collect the slurry from exposed aggregate washing. Never allow the slurry to get into a storm drain, ditch, roadway shoulder or gutter. Use a storm drain cover, inlet protection, or other containment device, such as a hand–dug, lined sump, to direct and contain slurry. All collected runoff must be disposed of properly. Stormwater Technical Information Report B-52 Memorial Park Phase 2, Tukwila, Washington MAGNUSSON KLEMENCIC ASSOC'ATES a • Do not discharge concrete, slurry, or rinse water into gutters, storm drains, or drainage ditches or onto the paved surface of a roadway or driveway. • Designate an area on site where hand tools will be cleaned and the water collected for disposal. Commercial products and services are also available for concrete, slurry, and rinse water containment and disposal. • Sweep the pouring area at the end of the job or more frequently if needed. Collect loose aggregate chunks and dust. Do not hose down the area to a storm drain. Activity Sheet A-31 — Vehicle and Equipment Parking and Storage • Sweep parking lots, storage areas, and driveways as needed to collect dirt, waste, and debris. Do not hose down the area to the storm drainage system. • If washing/pressure washing of the parking lot occurs, the wash water must be collected and discharged to a sanitary sewer or other treatment system. There are services that will clean parking lots and collect water for off-site disposal. Never drain wash water to the storm drainage system. • Gravel and dirt lots may require additional BMPs to prevent sediment -laden water from leaving the site. Vehicles can track dirt out of parking and storage areas onto public roadways. Basic sediment controls as outlined in Appendix D ("Erosion and Sediment Control Standards") of the King County Surface Water Design Manual must be installed if other BMPs do not adequately control sediment laden water from entering off site storm water conveyance systems or surface water. Wheel wash facilities may need to be considered if track -out of mud becomes a problem. See Activity Sheet A- 41, "Wheel Wash and Tire Bath Operations." Activity Sheet A-42 — Potable Water Line Flushing or Tank Maintenance • When flushing water lines, filter water through sediment traps. If super -chlorination or chemical treatment is used as part of flushing, the water must be discharged to the sanitary sewer (with applicable permits) or, if a sanitary sewer is not available, the water must be collected and disposed of appropriately. Water cannot be discharged directly to stormwater systems unless it is treated and water quality standards are met. Discharging treated water to stormwater systems requires approval from the Washington State Department of Ecology. Activity Sheet A-44 — Dust Control and Soil Erosion and Sediment Control for Manufacturing and Other Commercial Operations • Sweep paved areas as needed where dust accumulates from commercial, manufacturing, and industrial operations. Use power vacuum cleaners and sweepers as appropriate to minimize generating airborne dust and for more efficient dust removal. • Regularly clean equipment and vehicles subject to dust accumulation from operations. Never wash down equipment or vehicles to the storm drainage system. Stormwater Technical Information Report B-52 Memorial Park Phase 2, Tukwila, Washington MAGNUSSON KLEMENCIC ASSOCATES ■ Stabilize or cover areas of exposed or disturbed soil where necessary to prevent soil erosion. See the King County Surface Water Design Manual, Appendix D, Erosion and Sediment Control Standards, for recommended erosion and sediment control practices and standards. • Ensure employees are trained in the proper operating procedures to minimize dust accumulation on the ground. SECTION 9: BOND QUANTITIES WORKSHEET, RETENTION/DETENTION FACILITY SUMMARY SHEET AND DECLARATION OF COVENANT Not applicable. This item is specific to work in unincorporated King County. • ► 1' • : _ • ► LLD u _ ► ► L ► u ► Not applicable. There are no new flow control or water quality facilities proposed for this project. Stormwater Technical Information Report B-52 Memorial Park Phase 2, Tukwila, Washington FIGURES MAGNUSSON KLEMENCIC ASSOCIATES MAGNUSSON KLEMENCIC ASSOC ATES FIGURE 1-1: VICINITY MAP Stormwater Technical Information Report B-52 Memorial Park Phase 2, Tukwila, Washington 1 40 ZO 0 40 scale 1° = 40' feet EXISTING WATER QUALITY TREATMENT (STORMFILTERI, TYP PHASE 2 SITE DISTURBANCE AREA, TYP MAGNUSSON KLEMENCIC ASSOCIATES RAISBECK AVIATION HIGH SCHOOL EXISTING STORM DRAIN, TYP PHASE 2 LIMITS OF WORK, TYP PROPERTY LINE, TYP EXISTING KING COLNTY OUTFALL TO SUP 6 FIGURE 1-2: SITE DRAINAGE AREA, CHARACTERIStICS, AND EXISTING STORM DRAIN SYSTEM Stormwater Technical Information Report B-52 Memorial Park Phase 2, Tukwila, Washington 12 20 40 41 (iI . 11 441 l'AIS11^,,C. NAT. 1A11, "IkF. tmFrl, 2 'Id t• MACiNiP6ON EMENCIC RAISBECK AVIATION HIGH SCI,(X)I r-YrING :iTOM DRAIN. iv, 411INIMO•411.1m• mingroramm•NOr \ DRAINS TO EXISTNG RAMS STORM RAN SYSTEM )./9 Ag CATCHMFAIT ARRA orvir)E ,Yri7ING ALL 1.0 0 PROPERTY I INE, TYP 111GliRt: 1-2: `:.31i -L DRAINAGE AREA, CLIARACILRISNICS, AND EXISTING STORM DRAIN SYSTEM Stormwater Technical Information Report B-52 Memorial Park Phase 2, Tukwila, Washington . ' , i� 40 20 0 40 scale t° = 40' feet I — PHASE 2 LIMITS OF WORK, TYP .l L MAGNUSSON KLEMENCIC ASSOC'ArES RAISBECK AVIATION HIGH SCHOOL EXI$TNG IMPERVIOIUS AREA. PRIOR TO PHASE 1 solo m:4 EXLSITNG PERVIOUS AREA PRIOR TO PHASE PROPERTY LINE, TYP FIGURE 2-2: EXISTING PERVIOUS AND IMPERVIOUS AREAS Stormwater Technical Information Report B-52 Memorial Park Phase 2, Tukwila, Washington 1 40 20 0 40 scale 1° = 40' feet PHASE 2 IMPERVIOUS AREA, TYP �! I PHASE 1 IMPERVIOUS AREA MAGNUSSON KLEMENCIC ASSOC AtES RAISBECK AVIATION HIGH SCHOOL !q 'S $ ;• PHASE 2 UMITS PERVIOUS AREA , OF WORK, TYP TYP PHASE 1 IMPERVIOUS AREA PROPERTY LINE, TYP \ \.. FIGURE 2-3: PROPOSED PERVIOUS AND IMPERVIOUS AREAS Stormwater Technical Information Report B-52 Memorial Park Phase 2, Tukwila, Washington 1 40 20 0 40 scale 1° = 40' feet 10 -FT MINIMUM PHASE 1 - PHASE 2 LIMITS VEGETATIVE IMPERVIOUS- ' OF WORK, TYP FLOWPATH,TYP AREA ;71 MAGNUSSON KLEMENCIC ASSOCIATES RA1s8ECK AVIATION HIGH SCHOOL LEGEND Q DISPERSION FEASIBLE - SEE VEGETATIVE FLOWPATH OFFSET ® DISPERSION INFEASIBLE - MINIMUM FLOWPATH CANNOT BE MET ® PERMEABLE PAVEMENT 0 EXISTING IMPFRVIOLS 1h/1/ DIRECTION O'" FLOW 1 PERVIOUS AREA , TYP \ t4 FIGURE 2-4: PROPOSED FLOW CONTROL BMPS FOR PHASE II IMPERVIOUS SURFACES CATCHMENT AREA DIVIDE PHASE 1 IMPERVIOUS AREA PROPERTY LINE, TYP • Stormwater Technical Information Report 5 B-52 Memorial Park Phase 2, Tukwila, Washington APPENDIX MAGNUSSON KLEMENCIC ASSOCIATES KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Part 1 PROJECT OWNER AND PROJECT ENGINEER Project Owner Museum of Flight Foundation Phone 206.764.5700 Address 9404 E Marginal Way S, 98108 Project Engineer Rita Greene Company Magnusson Klemencic Associates Phone 206.215.8237 Part 3 TYPE OF PERMIT APPLICATION ❑ Landuse (e.g.,Subdivision / Short Subd. / UPD) 21 Building (e.g.,M/F / Commercial / SFR) ❑ Clearing and Grading ❑ Right -of -Way Use ❑ Other Part 2 PROJECT LOCATION AND DESCRIPTION Museum of Flight B-52 Project Name Memorial park Ph2 DPER Permit # N/A Location Township Range 4E Section 33 Site Address 9725 E Marginal Way S, 98108 24N Part 4 OTHER REVIEWS AND PERMITS ❑ DFW HPA ❑ COE 404 ❑ DOE Dam Safety ❑ FEMA Floodplain ❑ COE Wetlands a( Other Tree Permit L7 Shoreline Management ❑ Structural RockeryNault/ ❑ ESA Section 7 Part 5 PLAN AND REPORT INFORMATION Technical Information Report Type (circle one): Standard / Experimental / Description: (include conditions in TIR Section 2) N/A Site Improvement Plan (Engr. Plans) N/A Not King County Project Full N/A Not King CountyProject 1 ❑ Type of Drainage Review ❑ Targeted Approved Adjustment No. Full Plan Type (check (check one): ❑ Simplified one): ❑ Modified ❑ Large Project ❑ Simplified Date (include revision ❑ Directed Date (include revision dates): dates): Date of Final: Date of Final: Part 6 SWDM ADJUSTMENT APPROVALS Type (circle one): Standard / Experimental / Description: (include conditions in TIR Section 2) N/A Blanket Approved Adjustment No. Date of Approval: 2016 Surface Water Design Manual 4/24/2016 KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Part 7 MONITORING REQUIREMENTS Monitoring Required: Start Date: Describe: Yes No Completion Date: Re: KCSWDM Adjustment No. Part 8 SITE COMMUNITY AND DRAINAGE BASIN Community Plan : N/A Special District Overlays: Drainage Basin: Stormwater Requirements: Part 9 ONSITE AND ADJACENT SENSITIVE AREAS N/A ❑ River/Stream ❑ Lake ❑ Wetlands ❑ Closed Depression ❑ Floodplain ❑ Other ❑ Steep Slope ❑ Erosion Hazard ❑ Landslide Hazard ❑ Coal Mine Hazard ❑ Seismic Hazard ❑ Habitat Protection Part 10 SOILS Soil Type SCS Soil Group D Slopes ❑ High Groundwater Table (within 5 feet) ❑ Other Erosion Potential ❑ Sole Source Aquifer ❑ Seeps/Springs ❑ Additional Sheets Attached 2016 Surface Water Design Manual 2 4/24/2016 KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Part 11 DRAINAGE DESIGN LIMITATIONS REFERENCE ❑ Core 2 — Offsite Analysis ❑ Sensitive/Critical Areas ❑ SEPA N/A ❑ LID Infeasibility ❑ Other LIMITATION / SITE CONSTRAINT ❑ Additional Sheets Attached Part 12 TIR SUMMARY SHEET (provide one TIR Summary Sheet per Threshold Discharge Area) Threshold Discharge Area: B-52 Project Redevelopment Site (name or description) Core Requirements (all 8 apply): Discharge at Natural Location Number of Natural Discharge Locations: 1 Offsite Analysis N/A, see report Level: 1 / 2 / 3 dated: Flow Control (include facility Level: 1 / 2 / 3 or Exemption Number summary sheet) N/A, see report Flow Control BMPs Basic Dispersion where feasible Conveyance System Spill containment located at: N/A, see report Erosion and Sediment Control / CSWPP/CESCL/ESC Site Supervisor: N/A Not King County Project Construction Stormwater Contact Phone: Pollution Prevention After Hours Phone: Maintenance and Operation Responsibility (circle one): (rivate". Public If Private, Maintenance Log Required: Yes /©o Financial Guarantees and Provided: Yes / No N/A Not King Liability County Project Water Quality (include facility Type (circle one): Basic / Sens. Lake / Enhanced Basic / Bog summary sheet) or Exemption No. N/A, see report Landscape Management. Plan: Yes / No Special Requirements (as applicable): Area Specific Drainage Type: CDA / SDO / MDP / BP / LMP / Shared Fac. /None) Requirements Name: Floodplain/Floodway Delineation Type (circle one): Major / Minor / Exemption / on - 100 -year Base Flood Elevation (or range): Datum: Flood Protection Facilities Describe: N/A, see report 2016 Surface Water Design Manual 3 4/24/2016 KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Part 12 TIR SUMMARY SHEET (provide one TIR Summary Sheet per Threshold Discharge Area) Source Control (commercial / industrial land use) Describe land use: Commercial, no Pollution Generating Surfaces Describe any structural controls: None Oil Control High -use Site: Yes / Treatment BMP: Maintenance Agreement: Yes he with whom? Other Drainage Structures Describe: Cover Measures Part 13 EROSION AND SEDIMENT CONTROL REQUIREMENTS MINIMUM ESC REQUIREMENTS Type/Description MINIMUM ESC REQUIREMENTS DURING CONSTRUCTION Type/Description AFTER CONSTRUCTION Clearing Limits Stabilize exposed surfaces Cover Measures Sr Remove and restore Temporary ESC Facilities Perimeter Protection Clean and remove all silt and debris, ensure ❑ Traffic Area Stabilization operation of Permanent Facilities, restore operation of Flow Control BMP Facilities as ar Sediment Retention necessary ❑ Surface Water Collection ❑ Flag limits of SAO and open space preservation ❑ Dewatering Control areas Dust Control ❑ Other ❑ Flow Control ❑ Protection of Flow Control BMP Facilities (existing and proposed) ❑ Maintain BMPs / Manage Project Part 14 STORMWATER FACILITY DESCRIPTIONS (Note: Include Facility Summary and Sketch) Flow Control Type/Description Water Quality Type/Description ❑ Detention ❑ Infiltration ❑ Regional Facility I:1 Shared Facility ❑ Flow Control BMPs ❑ Other ❑ Vegetated Flowpath ❑ Wetpool ❑Filtration CI Oil Control ❑ Spill Control ❑ Flow Control BMPs ❑ Other N/A, see report 2016 Surface Water Design Manual 4 4/24/2016 KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Part 15 EASEMENTS/TRACTS Part 16 STRUCTURAL ANALYSIS ❑ Drainage Easement ❑ Covenant U Native Growth Protection Covenant ❑ Tract ❑ Other N/A, see report ❑ Cast in Place Vault ❑ Retaining Wall ❑ Rockery > 4' High ❑ Structural on Steep Slope ❑ Other N/A, see report Part 17 SIGNATURE OF PROFESSIONAL ENGINEER I, or a civil engineer under my supervision, have visited the site. Actual site conditions as observed were incorporated into this worksheet and the attached Technical Information Report. To the best of my knowledge the information provided here is accurate. Signed/Date 2016 Surface Water Design Manual 4/24/2016 5 May 24, 2018 Museum of Flight 9404 East Marginal Way Seattle, Washington 98108 Attention: Clark Miller REVIEWED FOR CODE COMPLIANCE APPROVED DEC 12 2018 City of Tukwila BUILDING DIVISION Subject: Review Letter Geotechnical Engineering Services Museum of Flight B-52 Plaza Foundations Tukwila, Washington City of Tukwila Permit No. D18-0088 File No. 8039-010-03 GEOENGINEERS 17425 NE Union Hill Road, Suite 250 Redmond, Washington 98052 425.861.6000 The purpose of this letter is to respond to a review comment received by the design team from the City of Tukwila that "the Geotech engineer of record shall review the drawings and submit a letter confirming that the plans meet all the condition/recommendation of the February 5, 2016 geotechnical report for MOF B-52 Foundation." GeoEngineers has reviewed the following for conformance with GeoEngineers' design recommendations for the project: ■ Drawing No. S001 prepared by Magnusson Klemencic Associates dated May 15, 2018 listing the general notes; • Drawing No. S002 prepared by Magnusson Klemencic Associates dated May 15, 2018 showing the plans, sections and details; and ■ Structural Calculation package prepared by Magnusson Klemencic Associates dated May 15, 2018. Based on our review of the plans, it is our opinion that the geotechnical aspects of these documents are generally consistent with the recommendations presented in our February 5, 2016 report and our report addendum dated May 15, 2018. CORRECTION N 8- 0098 RECEIVED CITY OF TUKWILA JUN 04 2018 PERMIT CENTER Museum of Flight May 24, 2018 Page 2 We trust this letter serves your current needs. Please call if you have any questions or require additional information. Sincerely, GeoEngineers, Inc. Nancy L. Tochko, PE Senior Geotechnical Engineer Matthew W. Smith, PE Principal NLT:MWS:nld Disclaimer: Any electronic form, facsimile or hard copy of the original document (email, text, table, and/or figure), if provided, and any attachments are only a copy of the original document. The original document is stored by GeoEngineers, Inc. and will serve as the official document of record. GEOENGINEERSI File No. 8039-010-03 SRG SRG ARCHITECTURE, INC 021 SW MORRISON, SUITE 200 PORTLAND, OREGON 97205 503 222 1917 110 UNION SUITE 300 SEATTLE WASHINGTON 98101 20797-3 1700 S1 0PARTNEIt;1-IIP CONI 23 July 2018 Bill Rambo Permit Technician City of Tukwila Department of Community Development 6300 Southcenter Boulevard, Suite #100 Tukwila, WA 98188 Subject: Response for Correction Letter #1 to Revision #1, and Correction Letter #2 Building Permit Application Number D18-0088 The Museum of Flight - B-52 Plaza - 9404 E Marginal Way S Dear Mr. Rambo, This letter accompanies the Building Permit Revision Submittal in response to Correction Letter #1 to Revision #1, and Correction Letter #2, both dated 10 July 2018, for The Museum of Flight's B-52 Plaza project (Permit Application Number D18-0088). This letter includes narrative responses to questions posed by the Planning department. PLANNING DEPARTMENT: 1. SRG has received a Notice of Decision, dated July 19, 2018, for the Shoreline Substantial Development permit (L18-0031), as provided by the City of Tukwila Department of Community Development. A copy of the Notice of Decision is attached for your reference. 2. For additional reference, a copy of the Notice of Decision, dated July 17, 2018, for the Shoreline Tree Removal and Vegetation Clearing permit (L18-0030), as provided by the City of Tukwila, is also attached herein. We appreciate your continued attention to this project. Please contact me at 206-973-1685 if you have any questions. Sincrely, Le„-. Elias Gardner, Assoc. AIA SRG Partnership REVIEWED FOR CODE COMPLIANCE APPROVCD DEC 122018 City of D NG DIVISION O N Clark Miller, The Museum of Flight Chris Mailander, The Museum of Flight RECRIVEi CITY O€= T UKV'y7ILA JUL 2 3 2018 PERMIT CENTER D1(6/ 00 X`6 JR RECT tN REVISION NO.., _ 1:131N3311i�1bi3d r IT) N 0 C (D cn • ciff7 ((DD C) _CO 0 m co 0 CD ✓ j. .. C) C) v o 0 O 93 CD CD - -n ✓ m N 1/1 O O O O 0 loaaia levo;gng i 0 F-� F4 N to w (J1 O N v CO O V 0 tri0 u1 I1 tD CD _C 0 O zi Z ID m - 4" iz:31) ,.,> Dc wpm 0 < o <V0 ITI r- -<= 0 z O O IIn Z m M rn 4' C < N m © • *v co 1 eIinn)Ini :uope3o1 ien;daauop :ma pig z4SHA Jo uanasnW iepouaaW ZS -8 SOW Construction Cost Estimate - Full Scope/Single Mobilization May 15, 2018 Museum of Flight 9404 East Marginal Way Seattle, Washington 98108 Attention: Clark Miller Subject: Report Addendum Geotechnical Engineering Services Museum of Flight B-52 Foundation Tukwila, Washington File No. 8039-010-03 REVIEWED FOR CODE COMPLIANCE APPROVED DEC 12 2018 City of Tukwila BUILDING DIVISION INTRODUCTION GEOENGINEERS 17425 NE Union Hill Road, Suite 250 Redmond, Washington 98052 425.861.6000 RECEIVED JUN 05 2018 TUKWILA PUBLIC WORKS REVIS1 N N This report addendum presents additional information concerning the proposed Museum of Flight's B-52 project at the Museum of Flight (MOF) in Tukwila, Washington. GeoEngineers previously provided geotechnical engineering design services for this project; the results of our design services were presented in our report dated February 5, 2016. The project site is shown relative to surrounding physical features on Figure 1, Vicinity Map and Figure 2, Site Plan. The foundation support for the B-52 was originally designed as a mat foundation. The project team has decided to support the B-52 on piles because of the proximity to a deep storm sewer line. Based on discussions with Robert Baxter of Magnusson Klemencic Associates (MKA) and information provided by MKA, we understand that the foundation will now consist of two piers with each pier supported on four piles. The piles will be subject to axial loads of up to 65 to 70 kips, and lateral loads of 9 to 10 kips. Drilled augercast piles are likely the most economical pile option and will provide the least disturbance to the nearby sewer line. Recommendations for augercast piles are presented in this addendum. PREVIOUS STUDIES GeoEngineers previously drilled two borings at the project site (B-1 and B-2) to depths of 31.5 and 41.5 feet. To evaluate the subsurface conditions at deeper depths, GeoEngineers reviewed the logs of explorations completed as part of previous studies in the vicinity of the project site, including those completed by GeoEngineers for the design of the Aviation Pavilion and the Aviation High School. The location of the explorations completed for these projects closest to the project site are also shown in Figure 2. The cone penetration log and boring log used in evaluating pile capacities are R€NED Appendix A, Previous Explorations. CITY OF TUKWILA bIB 0086 JUN 04 2018 PERMIT CENTER Museum of Flight May 15, 2018 Page 2 CONCLUSIONS AND RECOMMENDATIONS We recommend that the B-52 be supported on augercast piles which are 40 feet in length. Piles extending to this depth will mitigate most, but not all, of the possible settlement due to the presence of liquefiable deposits. Earthquake Engineering Regional Seismicity The Puget Sound region is located at the convergent continental boundary known as the Cascadia Subduction Zone (CSZ), which extends from mid -Vancouver Island to Northern California. The CSZ is the zone where the westward advancing North American Plate is overriding the subducting Juan de Fuca Plate. The interaction of these two plates results in three potential seismic source zones: (1) a shallow crustal source zone; (2) the Benioff source zone; and (3) the CSZ interplate source zone. The shallow crustal source zone is used to characterize shallow crustal earthquake activity within the North American Plate at depths ranging from 3 to 19 miles below the ground surface. The Seattle Fault Zone is considered a shallow crustal source zone. The site is located very close to the current geologic interpretation of the southernmost strand of the east -west trending Seattle Fault Zone. The most recent major earthquake on the Seattle Fault Zone is estimated to have occurred about 1,100 years ago. The Benioff source zone is used to characterize intraplate, intraslab or deep subcrustal earthquakes. Benioff source zone earthquakes occur within the subducting Juan de Fuca Plate at depths between 20 and 40 miles. In recent years, three large Benioff source zone earthquakes occurred that resulted in some liquefaction in loose alluvial deposits and significant damage to some structures. The first earthquake, which was centered in the Olympia area, occurred in 1949 and had a magnitude of 7.1. The second earthquake, which was centered between Seattle and Tacoma, occurred in 1965 and had a magnitude of 6.5. The third earthquake, which was located in the Nisqually valley north of Olympia, occurred in 2001 and had a magnitude of 6.8. The CSZ interplate source zone is used to characterize rupture of the convergent boundary between the subducting Juan de Fuca Plate and the overriding North American Plate. The depth of CSZ earthquakes is greater than 40 miles. No earthquakes on the CSZ have been instrumentally recorded; however, through the geologic record and historical records of tsunamis in Japan, it is believed that the most recent CSZ event occurred in 1700. International Building Code Seismic Design Information We recommend the use of the following 2015 International Building Code (IBC) parameters for Site Class, short period spectral response acceleration (Ss), 1 -second period spectral response acceleration (Si) and seismic coefficients (FA and Fv) for the project site. It should be noted that while our analyses indicate that potentially liquefiable soils are present at the site, the fundamental period of vibration of the planned structure is anticipated to be less than 0.5 seconds, and as a result, the exception presented in Section 20.3 of ASCE 7-10 applies for determining the site class. If the fundamental period of vibration of the structure is longer than 0.5 seconds, GeoEngineers should be contacted to provide further guidance. GEOENGINEERS .g _ ".0 8C39-C13-�3 Museum of Flight May 15, 2018 Page 3 2015 IBC SEISMIC DESIGN PARAMETERS 2015 IBC Parameter Recommended Value Site Class E Short Period Spectral Response Acceleration, Ss (percent g) 151 1 -Second Period Spectral Response Acceleration, Si (percent g) 58 Seismic Coefficient, Fa 0.9 Seismic Coefficient, Fv 2.4 Liquefaction Liquefaction is a phenomenon where soils experience a rapid Toss of internal strength as pore water pressures increase in response to strong ground shaking. The increased pore water pressure may temporarily meet or exceed soil overburden pressures to produce conditions that allow soil and water to flow, deform or erupt from the ground surface. Ground settlement, lateral spreading and/or sand boils may result from soil liquefaction. Structures, such as buildings, supported on or within liquefied soils may suffer foundation settlement or lateral movement that can be damaging to the buildings. Based on our analyses, the potential exists for liquefaction within zones of the loose to medium dense sand deposits encountered in the borings completed at the site. The evaluation of liquefaction potential depends on numerous site parameters, including soil grain size, soil density, site geometry, static stresses and the design ground acceleration. Typically, the liquefaction potential of a site is evaluated by comparing the cyclic shear stress ratio (the ratio of the cyclic shear stress to the initial effective overburden stress) induced by an earthquake to the cyclic shear stress ratio required to cause liquefaction. The cyclic shear stress ratio required to cause liquefaction was estimated using an empirical procedure developed by R.E. Moss (2003) based on cone penetration test (CPT) results obtained during field explorations. Estimated ground settlement resulting from earthquake - induced liquefaction was analyzed using empirical procedures by Tokimatsu and Seed (1987) that relate settlement to the CPT data. Analysis of the standard penetration test (SPT) data completed at the site and the SPT and CPT data from the Aviation Pavilion and the Aviation High School project indicates that there is a potential for liquefaction in silt and sand layers within the upper alluvial deposits for the design earthquake event. We estimate that the factor of safety is Tess than 1 during the design -level earthquake for most of the deposits above a depth of about 50 feet, and for isolated layers of sand and silt present at depths of 50 to 65 feet. Liquefaction -induced free -field ground settlement of the potentially liquefiable zones is estimated to be on the order of 6 to 10 inches for a design -level earthquake. The magnitude of liquefaction -induced ground settlement will vary as a function of the characteristics of the earthquake (earthquake magnitude, location, duration and intensity) and the soil and groundwater conditions. Lateral Spreading Lateral spreading involves lateral displacements of large volumes of liquefied soil. Lateral spreading can occur on near -level ground as blocks of surface soils are displaced relative to adjacent blocks. Lateral spreading also occurs as blocks of surface soils are displaced toward a nearby slope or free -face such as the nearby waterfront by movement of the underlying liquefied soil. Slip No. 6 of the Duwamish River GEOENGINEERS ple Nu 3039-01(: 03 Museum of Flight May 15, 2018 Page 4 waterway to the west of the site represents a free face condition. Slip No. 6 is a rip -rap faced cut slope which extends about 30 feet below the surrounding adjacent grades, based on available bathymetric information. The central portion of the airpark is about 400 feet from the top of the slope forming the slip. The evaluation of lateral spreading at the site was completed during the design of the Aviation Pavilion and the results of our analyses indicate that ground movement during lateral spreading could be greater than 18 inches if spreading were to occur. We understand that the B-52 foundation will not be designed to withstand lateral spreading. Surface Fault Rupture Based on the United States Geological Survey (USGS) maps of active faults in the Puget Sound region, the site is located close to the Seattle Fault zone. As the depth to bedrock in this area is on the order of about 150 to 250 feet, there is some risk for potential surface fault rupture. However, in our opinion, the risk for surface fault rupture at the project site is still relatively low considering the length and width of the Seattle Fault and the uncertainties associated to the fault location. B-52 Foundation Recommendations - Augercast Piles Augercast piles are an economical pile type in the northwest and typically provide the least disturbance to existing operations. Recommendations for 14- and 18 -inch -diameter augercast piles are provided below. We recommend that the piles extend 40 feet into the underlying sand deposits. Augercast piles are constructed using a continuous -flight, hollow -stem auger attached to a set of leads supported by a crane. The first step in the pile casting process consists of drilling the auger into the ground to the specified tip elevation of the pile. Grout is then pumped through the hollow stem during steady withdrawal of the auger and replaces the soils withdrawn on the flights of the auger. The final step is to install a steel reinforcing cage and typically a center bar into the column of fresh grout. One benefit of using augercast piles is that the auger provides support for the soils during the pile installation process, thus eliminating the need for temporary casing or drilling fluid. Another benefit is the elimination of vibrations associated with driven piles. Axial Capacity Axial pile capacity in compression is anticipated to be developed from a combination of side frictional resistance and end bearing capacity. Uplift pile capacity will be developed from side frictional resistance in the deposits which are not prone to liquefaction during a seismic event. Based on the explorations completed for the B-52 and the other nearby projects, we recommend that the piles have a minimum length of 40 feet. For augercast piles which have a minimum length of 40 feet, we recommend the following pile capacities be used for design: Allowable Axial Compression Capacity Allowable Axial Uplift Capacity Pile Type and Size (kips) (kips) 14 -inch augercast pile 50 20 18 -inch augercast pile 70 30 GEOENGINEERS File ' 8039&010 C3 Museum of Flight May 15, 2018 Page 5 These allowable values do consider a possible loss of a portion of the skin friction if some liquefaction were to occur, but some settlement could still occur if a very large earthquake resulted in liquefaction of most of this upper sand layer. As a result, it is recommended that the allowable pile capacities not be increased by one-third when considering seismic design loads, but may be increased by one-third for other short term loading such as wind. The allowable capacities are based on the strength of the supporting soils and include a factor of safety of 2 for static loading conditions. For seismic loading conditions, we estimate that the factor of safety is greater than approximately 1.25. The capacities apply to single augercast piles. Axial reduction factors for group effects do not need to be applied if the piles are spaced at least three pile diameters on center. The structural characteristics of the shaft materials and structural connections may impose limitations on shaft capacities and should be evaluated by the structural engineer. Lateral Capacity Lateral loads can be resisted by passive soil pressure on the vertical piles and by the passive soil pressures on the pile cap. Because of the potential separation between the pile -supported foundation components and the underlying soil from settlement, base friction along the bottom of the pile cap should not be included in calculations for lateral capacity. We evaluated the lateral capacity of a single 14- and 18—inch-diameter augercast pile using the computer software program LPILE v2013 produced by Ensoft, Inc. Each pile was assumed to be 40 feet long with the top of the pile modeled as a free -head and located at the bottom of the pile cap. Lateral capacities were evaluated for a range of lateral loads for a free -head condition. Lateral capacities were evaluated for both a static condition, assuming no liquefied soil, and a seismic condition where a reduced strength was assumed. The results of our analysis are presented in Figures 3 through 14. These figures present the deflection, moment and shear versus depth for free -head conditions for 14- and 18—inch-diameter augercast piles subjected to a range of lateral loads at the pile cap. Piles spaced closer than eight pile diameters apart will experience group effects that will result in a lower lateral Toad capacity for trailing rows of piles with respect to leading rows of piles for an equivalent deflection. We recommend that the lateral load capacity for trailing piles in a pile group spaced three pile diameters apart be reduced by a factor of 0.6. Reductions of the lateral load capacity for trailing piles at spacings greater than three pile diameters but less than eight pile diameters apart can be linearly interpolated. We recommend that the passive soil pressure acting on the pile cap be estimated using an equivalent fluid density of 300 pounds per cubic foot (pcf) where the soil adjacent to the foundation consists of structural fill compacted to at least 95 percent of MDD. The structural fill should extend out from the face of the foundation element for a distance at least equal to 2.5 times the height of the element. This passive resistance value includes a factor of safety of 1.5 and assumes a 2.5 -foot -deep pile cap and a minimum lateral deflection of 1 inch to fully develop the passive resistance. Deflections that are less than 1 inch will not fully mobilize the passive resistance in the soil. GEOENG1NEERS kne �0 9035-01C 03 Museum of Flight May 15, 2018 Page 6 Pile Settlement We estimate that the post -construction settlement of pile foundations, designed and installed as recommended, will be on the order of 1 inch or less. Maximum differential settlement should be less than about one-half the post -construction settlement. Most of this settlement will occur rapidly as loads are applied. Construction Considerations Augercast concrete piles should be installed to the recommended penetration discussed previously using a continuous -flight, hollow -stem auger. As is common practice, the pile grout is pumped under pressure through the hollow stem as the auger is withdrawn. Reinforcing steel for bending and uplift is placed in the fresh grout column immediately after withdrawal of the auger. An advantage of the augercast pile installation method is that it causes relatively little vibration and variable length piles can easily be installed. We recommend that the augercast piles be installed by a contractor experienced in their placement and using suitable equipment. Grout pumps should be fitted with a volume -measuring device and pressure gauge so that the volume of grout placed in each pile and the pressure head can be easily determined. While grouting, the rate of auger withdrawal should be uniform and controlled such that the volume of grout pumped is equivalent to at least 115 percent of the theoretical hole volume. A minimum grout line pressure of 100 pounds per square inch (psi) and a minimum grout head of 10 feet (depth of auger in ground when grout return is observed) should be maintained. We recommend that there be a waiting period of at least eight hours between installation of piles spaced closer than 8 feet center -to -center in order to avoid disturbance of concrete undergoing curing in a previously cast pile. Obstructions could be encountered during installation such that new pile locations may need to be selected and/or pile capacities may need to be reevaluated. There may be unexpected variations in the depth to and characteristics of the supporting soils. In addition, no direct information regarding the capacity of augercast piles (e.g., driving resistance data) is obtained while this type of pile is being installed. Therefore, it is particularly important that the installation of augercast piles be monitored by GeoEngineers. LIMITATIONS We have prepared this report for the exclusive use of the MOF and members of the design team for the B-52 Foundation project in Tukwila, Washington. The data and report should be provided to prospective contractors for their bidding or estimating purposes, but our report, conclusions and interpretations should not be construed as a warranty of the subsurface conditions. Within the limitations of scope, schedule and budget, our services have been executed in accordance with generally accepted practices in the field of geotechnical engineering in this area at the time this report was prepared. No warranty or other conditions, express or implied, should be understood. Any electronic form, facsimile or hard copy of the original document (email, text, table, and/or figure), if provided, and any attachments are only a copy of the original document. The original document is stored by GeoEngineers, Inc. and will serve as the official document of record. GEOENGINEERS .11 Fde \u 8039-01C 2.3 Museum of Flight May 15, 2018 Page 7 Please refer to the appendix titled "Report Limitations and Guidelines for Use" in our February 5, 2016 geotechnical report for additional information pertaining to use of this report addendum. We trust that this letter is satisfactory for your current needs. Please call if you have any questions regarding this information. Sincerely, GeoEngineers, Inc. 1404 Nancy L. Tochko, PE Senior Geotechnical Engineer Matthew W. Smith, PE Principal NLT:MDS:mce Attachments: Figure 1. Vicinity Map Figure 2. Site Plan Figures 3 through 14. LPile Results Appendix A. Previous Explorations Disclaimer: Any electronic form, facsimile or hard copy of the original document (email, text, table, and/or figure), if provided, and any attachments are only a copy of the original document. The original document is stored by GeoEngineers, Inc. and will eerve as the official document of record. GEOENGINEERS File No. 8039-010-03 .0 d: 05/10/18 by c O O Q v a Q F S Austin 505N .9 5 Holden St De a De 5 Portland Si 5 Chicago 55 5 Monroe 5t S Elmgrove 55 5 Elmgrove St 5 Southern 5t 5 Southern St 5 Donovan St a°p S Rose St v m a SD Sr 9 L L O- >Od11aS 5 Sullivan St g Ave 5 S Cloverdale St S Donovan St aS Concord 5t \ Health Centers ,As • S Henoerson 5t - 5 Henderson St Sea Mar Community 5 Director 5t 5 Director 5t 591st5t i' S 93rd St 5 96th 5t 5 35th 5t 5 9bt50 St 5 99550 5t 599th PI 9,w S 100th 5t S1Dtst St 5 a f, GLENDALE vL 2 5 102nd St< 47,.. s 5 103 w N — ' 5 m oa' Hamlin Robinson v, Srp School ing-t -.6..., e u Bevedy Park Elementary v $ 'I'S . School u b ¢ ; L u Q L 22 a a• h t ,n p 70. P: i ` '5 a S 107th St s 5 108t 5[ va, is Glen Acres Golf 5 E Country Club SOUTHERN HEIGHTS 5 103rd 5t 5 104th 5t Boeing Field SITE a Bashed( Avi., on High School 5 116th 557h -i N L 5 Webster 5` -5'. 1w Park Dr NHp UEt$ oaa S Austin 55 5 An 5t 01usti S Hoide, St n 5 Portland 5t r ry 5 Chicago 5t * H Othello Park L 6 Museum of Flight 5 96th" 5 112th 51 5 115th 51 5110th 51 5 117th 51 • Raimer GRIL 0 Country Club 'L. N c on 5112':h St rn 3 ▪ 50 o4' �P°Z Sy Green RNer Trail ldrh _I S 116rh 5551551155 SSKenyon St 5 Kenyon 5t 5 Kenyon 5 P �. > G v J tk j p WingSuke Elementary p e s en School m in Ij. N in Van Aselt Elementary School ;., S Thistle St 5k°ay 5No DUWAMISH s Sulhva, st w A m SCloverdale St v _ L5 Cloverda � d 5 Trenton St a y5 Barton 51 /0 Fast Duwamssh 5 Benefit 55 Greenbelt 14 ° v 5 Burns St 5 Pilgrim St 5 Perry St Oureamish HAI Preserve 5 Norfolk St p 115th St Rai E m 0 T C 7 P:\8\8039010\GIS\803901003 Song Silverdale Bainbridge Island Edands Point-Nitsap take Seat leBellevue Cl + BRnen_ Reneon I .Hoban Hent Duvall wew *nondate mie Xa h Bend Notes: 1. The locations of all features shown are approximate. 2. This drawing is for information purposes. It is intended to assist in showing features discussed in an attached document. GeoEngineers, Inc. cannot guarantee the accuracy and content of electronic files. The master file is stored by GeoEngineers, Inc. and will serve as the official record of this communication. Data Source: Mapbox Open Street Map, 2015 Projection: NAD 1983 UTM Zone 10N 2,000 2,000 Feet Vicinity Map Museum of Flight B-52 Foundation Addendum Tukwila, Washington GEOENGINEERS Figure 1 P:\8\8039010\CAD\03\GeoTech Addendum\803901003_F02_Site Plan.dwgTAB:Layoutl Date Exported: 05/14/18 - 9:44 by cstickel V r B-1 B-3 (2009) King County storm drain easement, rec. no. 9509180955 Existing manhole cover Area of monitoring wells, / � undisturbed vents to remain undisturbed 0,9naryH�Bh L7 - CPT -1 (2009) A Raisbeck Aviation High School Existing fire ifydrant Existing stall converted to accessible van park ng staff------ Install light pole and 1r bollards -25' east Remove existing light _Rol_nd bollards - B-7 (20094-'. f, \ ti b f --r-�-'=t--r- r--r----� \ 11 1 (LIL r I Picnictableityp / (OFOI) \, \ Future 8-52 aircraft ' ' (not in Ph 1 project) \ •0_• Future slab foundation (not in Ph I project) \ N'4'. N \ L --1--1--_I C, __ 1---1--, New one way - riping/parking 00 .'\ °,h\ c4 \ a ,\�2 ash \Property line, tyP \___.__. __._. _ 593605f) - -"-"- -" - Limits of work, tyP ( I I I I d' B-2 (2009) GEI-1(2014) A Aviation Pavilion ',New wheelstopsps; t)ip (65),plabes \\ Inapt' light po(eand bollards-25'east Remote existing I)gh pole ant,bollards Demolished striping, (29 spaces.ota3; Fire lane, typ•,' icX ( "�(' \,\\\ ' Connection to fire loop-'' 1\ )L' . Existing fire loop C \�/ Lobation of new irrigation," :'� infrastructure: Deduct Meter \ ,\ \ Backflow Preventer Exis9'ngX)viation ,\ , P2vilion generator pad \ ' Uncompectfd gravel - - -> v;A., A A \ \ this�ee (-6�osf) B-1 GEI-1 (2014) A CPT -1 (2009) A B-2 (2009) Legend Boring, Completed for this Study CPT, Completed for the Aviation Pavilion CPT, Completed for Aviation High School Boring, Completed for Aviation High school Notes: 1. The locations of all features shown are approximate. 2. This drawing is for information purposes. It is intended to assist in showing features discussed in an attached document. GeoEngineers, Inc. cannot guarantee the accuracy and content of electronic files. The master file is stored by GeoEngineers, Inc. and will serve as the official record of this communication. Data Source: Base data provided by SRG Partnership, Inc Projection: Washington State Plane, North Zone, NAD83, US Foot 40 0 Feet 40 Site Plan Museum of Flight B-52 Foundation Addendum Tukwila, Washington GEOENGINEERS r Figure 2 Project No. 8039-010-03 Exported on 5/14/18 14 -Inch Diameter Augercast Concrete Pile - Static Lateral Pile Deflection (inches) 0 0.2 0.4 0.6 0.8 1 12 o Shear - 5 kips Shear - 10 kips Shear - 15 kips Loading Input Axial = 42 kips (Compression) Free Head Condition LPile Results - Deflection 14 -inch -diameter - Static Museum of Flight B-52 Foundation Tukwila, Washington GEOENGINEERLO Figure 3 Project No. 8039-010-03 Exported on 5/14/18 Name M 14 -Inch Diameter Augercast Concrete Pile - Static Bending Moment (in -kips) 200 400 0 600 Shear - 5 kips Shear - 10 kips I Shear - 15 kips Loading Input Axial = 42 kips (Compression) Free Head Condition LPile Results - Bending Moment 14 -inch -diameter - Static Museum of Flight B-52 Foundation Tukwila, Washington GEOENGINEERS Figure 4 Project No. 8039-010-03 Exported on 5/14/18 0 0 14 -Inch Diameter Augercast Concrete Pile - Static Shear Force (kips) -5 0 5 10 Shear - 5 kips Shear - 10 kips Shear - 15 kips M 0 71- Loading Input Axial = 42 kips (Compression) Free Head Condition LPile Results - Shear 14 -inch -diameter - Static Museum of Flight B-52 Foundation Tukwila, Washington GEOENGINEERLO Figure 5 Project No. 8039-010-03 Exported on 5/14/18 14 -Inch Diameter Augercast Concrete Pile - Seismic Lateral Pile Deflection (inches) 0.5 1 1.5 2 0 kr; V) N `,r r v Shear - 5 kips n Shear - 10 kips AShear - 15 kips Loading Input Axial = 42 kips (Compression) Free Head Condition LPile Results - Deflection 14 -inch -diameter - Seismic Museum of Flight B-52 Foundation Tukwila, Washington GEOENGINEERSZ Figure 6 Project No. 8039-010-03 Exported on 5/14/18 14 -Inch Diameter Augercast Concrete Pile - Seismic Bending Moment (in -kips) 0 200 400 600 M Shear - 5 kips Shear - 10 kips ''Shear - 15 kips Loading Input Axial = 42 kips (Compression) Free Head Condition 0 LPile Results - Bending Moment 14 -inch -diameter - Seismic Museum of Flight B-52 Foundation Tukwila, Washington GEOENGINEER Figure 7 Project No. 8039-010-03 Exported on 5/14/18 0.1 immg D N 1' 14 -Inch Diameter Augercast Concrete Pile - Seismic Shear Force (kips) -5 0 5 10 1i5 Shear - 5 kips Shear - 10 kips Shear - 15 kips Loading Input Axial = 42 kips (Compression) Free Head Condition LPile Results - Shear 14 -inch -diameter - Seismic Museum of Flight B-52 Foundation Tukwila, Washington GEOENGINEERS...0 Figure 8 Project No. 8039-010-03 Exported on 5/14/18 -0.1 0 4 a= Nome� A o N ,n M 18 -Inch Diameter Augercast Concrete Pile - Static Lateral Pile Deflection (inches) 0 0.1 0.2 0.3 0.4 0.5 0!6 Shear - 5 kips Shear - 10 kips Shear - 15 kips Loading Input Axial = 45 kips (Compression) Free Head Condition LPile Results - Deflection 18 -inch -diameter - Static Museum of Flight B-52 Foundation Tukwila, Washington GEOENGINEER Figure 9 Project No. 8039-010-03 Exported on 5/14/18 Depth (ft) 0 35 30 25 20 15 10 5 0 18 -Inch Diameter Augercast Concrete Pile - Static Bending Moment (in -kips) 0 200 400 600 L - r • ',Shear - 5 kips .Shear - 10 kips Shear - 15 kips "71 - Loading Input Axial = 45 kips (Compression) Free Head Condition LPile Results - Bending Moment 18 -inch -diameter - Static Museum of Flight B-52 Foundation Tukwila, Washington GEOENG1NEERS ....0 Figure 10 18 -Inch Diameter Augercast Concrete Pile - Static Shear Force (kips) v Shear - 5 kips Shear - 10 kips ,,Shear - 15 kips Loading Input Axial = 45 kips (Compression) Free Head Condition LPile Results - Shear 18 -inch -diameter - Static Museum of Flight B-52 Foundation Tukwila, Washington GEOENGINEERS Figure 11 Project No. 8039-010-03 Exported on 5/14/18 V's 18 -Inch Diameter Augercast Concrete Pile - Seismic Lateral Pile Deflection (inches) 0.2 0.4 0.6 0.8 'Shear - 5 kips Shear - 10 kips Shear - 15 kips Loading Input Axial = 45 kips (Compression) Free Head Condition LPile Results - Deflection 18 -inch -diameter - Seismic Museum of Flight B-52 Foundation Tukwila, Washington GEOENGINEER51; Figure 12 Project No. 8039-010-03 Exported on 5/14/18 Depth (ft) 0 25 20 15 10 5 0 18 -Inch Diameter Augercast Concrete Pile - Seismic Bending Moment (in -kips) 0 200 400 600 1 • , r ; ?Shear - 5 kips .Shear - 10 kips in M Shear - 15 kips • O Loading Input Axial = 45 kips (Compression) Free Head Condition LPile Results - Bending Moment 18 -inch -diameter - Seismic Museum of Flight B-52 Foundation Tukwila, Washington GEOENGINEERS Figure 13 Project No. 8039-010-03 Exported on 5/14/18 18 -Inch Diameter Augercast Concrete Pile - Seismic Shear Force (kips) -5 0 5 4040 .r D o N 71 - 10 15 , Shear - 5 kips Shear - 10 kips Shear - 15 kips Loading Input Axial = 45 kips (Compression) Free Head Condition LPile Results - Shear 18 -inch -diameter - Seismic Museum of Flight B-52 Foundation Tukwila, Washington GEOENG1NEERS _L7 Figure 14 APPENDIX A Previous Explorations Tip Resistance Qc TSF 0 0 20 40 epth 60 (ft) 80 100 120 ueotngineers Operator: Dafni Sounding: CPT -1 Cone Used: DSG1029 CPT Date/Time: 7/22/2009 12:25:12 PM Location: Aviation High School Job Number: 2820-003-00 Friction Ratio Pore Pressure Soil Behavior Type* SPT N* Fs/Qc (%) Pw PSI Zone: UBC -1983 60% Hammer 400 0 4 -20 140 0 12 0 100 r Maximum Depth = 107.45 feet T T Depth Increment = 0.164 feet l { 1 sensitive fine grained • 4 silty clay to clay .7 silty sand to sandy silt • 10 gravelly sand to sand 2 organic material 15 clayey silt to silty clay 8 sand to silty sand M 11 very stiff fine grained (*) 3 clay ■ 6 sandy silt to clayey silt 9 sand 12 sand to clayey sand (*) • • ueotngineers - museum or riignt uoverea HirparK Tip Resistance Qt TSF 0 0 10 20 30 40 epth 50 (ft) 60 70 80 90 100 Operator: Springer Sounding: CPT - 01 Cone Used: DDG1238 Friction Ratio Fs/Qt (%) 500 0 L L , r - 7 -20 I — Maximum Depth = 93.67 feet CPT Date/Time: 5/7/2014 8:54:25 AM Location: Museum of Flight Job Number: 8039-10-00 Pore Pressure Pw PSI Soil Behavior Type* Zone: UBC -1983 140 0 12 F MOIL Depth Increment = 0.164 feet SPT N* 60% Hammer 0 120 1 sensitive fine grained • 4 silty clay to clay ® 7 silty sand to sandy silt • 10 gravelly sand to sand 2 organic material . 5 clayey silt to silty clay 8 sand to silty sand 11 very stiff fine grained (*) 3 clay 1 6 sandy silt to clayey silt 9 sand 12 sand to clayey sand (*) Stan Jaworowski From: Sent: To: Subject: Attachments: Stan Jaworowski Thursday, May 31, 2018 11:13 AM Stan Jaworowski FW: MOF B-52 Memorial Park: 2018--05-02 Meeting Notes -Easement. KCIA Slip 6 Pipe Maps.pdf; KCIA Slip 6 Pipe Reports.pdf From: Dumaliang, Peter [mailto:Peter.Dumaliang@kingcounty.gov] Sent: Wednesday, May 09, 2018 10:36 AM To: Clark Miller <CMiller@museumofflight.org> Subject: RE: MOF B-52 Memorial Park: 2018--05-02 Meeting Notes -Easement. My apologies, Clark. I was in a meeting this morning. Regarding status, we are moving forward with the MOU detailing our agreement. Mark Witsoe will initiate the draft and I will look into when he will get a draft ready for review. I will also follow up with Abhijit on the ROM estimates. The pipe inspection reports are attached but do not provide much detail on condition. I can supply you with the videos by uploading them to an FTP site or dropbox. They are fairly large (1 Gb total). Thanks. Peter Dumaliang, Environmental Engineer/PM Airport Engineering King County International Airport/Boeing Field 7277 Perimeter Rd. S. Seattle WA 98108 Direct: (206) 477-0212 Fax: (206) 296-0190 Cell: (206) 391-7577 From: Clark Miller [mailto:CMiller@museumofflight.org] Sent: Monday, May 07, 2018 4:23 PM To: Witsoe, Mark <Mark.Witsoe@kingcounty.gov>; Dumaliang, Peter <Peter.Dumaliang@kingcounty.gov> Cc: Chris Mailander<CMailander@museumofflight.org>; Stan Jaworowski <siaworow@srgpartnership.com>; Apgar, Dirk <Dirk.Apgar@kingcounty.gov>; abhijit@geometricseng.com Subject: RE: MOF B-52 Memorial Park: 2018--05-02 Meeting Notes -Easement. REVIEWED FOR CODE COMPLIANCE APPROVED DEC 12 2018 City of Tukwila BUILDING DNISION Mark and Peter, We are on such a tight schedule now that as soon as you have the results of the video and the agreement that the Museum can build over the easement, with the stipulations outlined in Stan's meeting notes, we can sure use that as soon as possible. If there is anything I can do please let me know. Thank you, Clark CORREC ION LTR# D18- 0038 1 RECEIVED CITY OF TUKWILA JUN 04 2018 PERMIT CENTER TWE MUSEUM OF FLIGHT Clark Miller 1 Vice President of Operations The Museum of Flight 9404 East Marginal Way S Seattle, WA 98108 Work: tei.+1 (206) 764-5737 www.museumofflight.org From: Stan Jaworowski[mailtc:sjaworow@srgpartnership.com] Sent: Monday, May 07, 2018 3:59 PM To: Mark.Witsoe@kingcounty.gov; Dirk.Apgar@kingcounty.gov; Dumaliang, Peter <Peter.Dumaliang@kingcounty.gov>; abhijit@ geometricseng.com; Clark Miller <CMiller@museumofflight.org>; Chris Mailander <CMailander@museumofflight.org>; Matt Gladney <mattg@sellen.com>; Bret Downing <BretD@sellen.com>; Mark Smith <MarkS@sellen.com>; Robert P. Baxter (rbaxter@mka.com) <rbaxter@mka.com>; Rita Greene (rgreene@mka.com) <rgreene@mka.com>; Natalie Ross - Site Workshop (natalier@siteworkshop.net) <natalier@siteworkshop.net> Subject: MOF B-52 Memorial Park: 2018--05-02 Meeting Notes -Easement. Greetings all, Attached please find notes from our meeting last week. Please return any comments or corrections you may have to me within two days; I will amend and re -distribute if required. Thanks - STAN JAWOROWSKI, AIA Senior Associate LEED AP D 206 973 1696 0 206 973 1700 SRG PARTNERSHIP, INC srgpartnership.com K 2 SRG SRG PARTNERSHIP. INC 621 SW COLUMBIA STREET PORTLAND. OREGON 97201 503 222 1917 110 UNION STREET. SUITE 300 SEATTLE. WASHINGTON 98101 206 973 1700 SRGPARTNERSHIP.COM MEETING MINUTES MEETING NAME:King County Easement PREPARED BY:SJaworowski, SRG PROJECT NAME: MOF B-52 Memorial Park PRESENT: BFI: Mark Witsoe, Dirk Apgar KCIA: Peter Dumaliang Geometrics: Abhijit Bathe MOF: Chris Mailander, Clark Miller SRG: Stan Jaworowski *Denotes part-time attendance MEETING DATE: 5/2/2018 REVISION DATE: Date SRG PROJECT #: 217021 DISTRIBUTION: BFI: M Witsoe, D Apgar KCIA: P Dumaliang Geometrics: A Bathe MOF: C Mailander, C Miller SRG: S Jaworowski Sellen: M Gladney, B Downing, Mark Smith MKA: R Baxter, R Greene Site Workshop: Natalie Ross Meeting was held at 3PM 5/2, Airport Terminal, 2nd Floor; agenda attached for reference. 1- Project Overview: Chris and Clark outlined the park purpose, layout, and timeline for construction. a. Origin of the project and overall design was described, perspective drawings of the site reviewed; b. Deadline for construction completion is now November; c. Plane is being disassembled and mega -loads arriving soon; aircraft (pieces) will be stored at the High School parking lot until reassembly occurs. KC noted that the pipe concrete, 3' in diameter, is old, on sandy soils, and could possibly fail regardless of the B-52 placement. 2- Access to SW manhole: Access not sufficient as currently shown. KC requests a minimum of 16' clear between west fence line, including west fence line plantings, to the plane's tail; vehicles (such as a vacuum truck) require 12-13 feet clear in height. Plan as shown does not account for the plantings. SRG will confer with Site Workshop to better understand the planting dimension and will reposition the aircraft to provide clearance as requested. MOF notes that the plane should be moved to the east as little as possible to achieve clearance. (It was later noted that the Museum may opt to pay a per tree fee and eliminate planting in the area, TBD.) 3- Cost issues, general: In the '72 version of the easement, KC was designated responsible for costs associated with the easement. The '95 modification reassigned that responsibility to the Museum. MOF asked to whether there might be some assistance; KC to talk informally, internally, regarding possible cost assist. Page 1 of 3 4- Review of easement options: SRG provided sketches of 5 options to address KC issues. Comment on each is as follows: a. Move plane to the east to provide greater clearance: i. as noted in SW manhole access note, the clearance shown is inadequate and will be widened by moving the plane, eliminating or reducing planting, or some combination therein. ii. Need to address the pipe and potential failure issues not considered here iii. It was noted that although it would be possible to move the plane after installation, the MOF strongly discourages that option. b. As above, and replace or reinforce pipe in place i. Considered to be a high-cost option due because the drainage must be maintained throughout the replacement- meaning a temporary pumping station and surface 'hose' would be required for duration of work. ii. Pipe depth makes replacement difficult- construction, shoring, groundwater issues represent challenges; iii. Replacement pipe would be 100 -year pipe construction (e.g. HPDE pipe in concrete); iv. Reduces likelihood that failure would occur at that location, but the basic accessibility issue remains. c. Move plane eastward (for clearance at west side) and re-route pipe to eliminate under -aircraft condition (preferred) i. KC preferred option provides long-term access to the pipe and easement without regard to B-52 placement; ii. Reduces possibility of liquefaction, sinkhole, or other potential geotechnical issues iii. Option can be phased to keep the overall project timeline intact. Details concerning this option to follow under that topic heading. d. Move aircraft for both footings to be on the same side of the easement and e. Move aircraft as far from easement as possible: i. For KC, neither option was acceptable because the easement/pipe would still be under the plane and the root issue of potential pipe failure would not be addressed; ii. For MOF and SRG, neither option was preferred because the relationship of the aircraft to the park and plaza and the overall landscape design suffered from the move. Page 2 of 3 5- Phasing option C: a. Construction of piles, pile caps and mounting the plane into position can occur per current schedule; the easement no longer is considered a factor in that regard; b. Design of the 'bypass' would commence as soon as an easement agreement is met. c. Bypass construction can be scheduled in either off two ways: i. Begin construction of the bypass after the aircraft installation; construction can be scheduled to coincide with contractor's low season, potehtially reducing cost, or ii. Monitor the pipe condition and keep the bypass plan in reserve until it is indicated that the pipe is suspected to be heading towards failure. Monitoring should consist of 1. Video inspection 2. Geo -physical testing 3. Ground penetration data 4. Microgravity surveying iii. Geometrics said that first evidence of problem with the pipe would likely allow approximately 6 months to start bypass construction. 6- Easement relocation: a. New easement would be 'swapped' for the existing one. This will be reviewed by KC and MOF legal advisors; b. Design for the new pipe will be by MOF (MKA) to be reviewed by KC; c. Design to occur after the easement approved, implemented when required; d. Per KC, slope of the pipe is not thought to be a factor because the redirected pipe is so close to the outfall; e. This project would likely be subject to City of Tukwila permit requirements. 7- Action items: a. SRG to re -position plane (move footings to the northeast, sliding along the easement) to provide access requested by KC. Site Workshop will provide diameter of trees at west side and the clear path will not include that area of vegetation. MOF has requested that the move be kept to a minimum. b. KC to provide information regarding the condition of the pipe and video to MOF/ design/ construction team. c. KC to begin internal discussion and create documentation for easement 'swap'. d. KC to provide ROM estimate for re-routing the pipe. e. KC to provide ROM estimate for annual pipe monitoring. f. MOF/MKA to begin new pipe design upon easement approval. END OF MEETING MINUTES Page 3 of 3 SRG SRG PARTNERSHIP. INC 621 SW COLUMBIA STREET PORTLAND. OREGON 97201 503 222 1917 110 UNION STREET SUITE 300 SEATTLE. WASHINGTON 98101 206 973 1700 SRGPARINERSHIP.COM MEETING AGENDA MEETING NAME:EaSement Issues MEETING LOCATION:KC Airport Terminal Rm 202 PREPARED BY:SJaworOwSki MEETING DATE: 5/2/2018 MEETING TIME: 3 PM PROJECT NAME: MOF B-52 Memorial Park SRG PROJECT #: 217021 ATTENDEES: Clark Miller, Chris Mailander, MOF; Stan Jaworowski, SRG Peter Dumaliang, Michael Colmant, Mark Witsoe, Dirk Apgar, KC 1- Project Overview 2- Project Permitting and Schedule a. Shoreline Substantial Development Permit comment & appeals periods end June 22 b. Aircraft disassembly under way c. Site construction begins Jun 25 d. Aircraft in place August 17 3- Submitted Plan and Aircraft Footing 4- Proposed Changes to that Plan: A. Pile cap instead of spread footing B. (option 1) Move aircraft to east, no other change C. (option 2) As above, and replace or reinforce pipe under and near aircraft D. (option 3) As above, re-route pipe and easement to avoid aircraft footings E. (option 4) Relocate aircraft so that footings are on same side of easement, further from easement F. (option 5) Relocate aircraft to maximize footing to easement 5- Other options (discussion) 6- Final direction for design, permit and construction END OF MEETING AGENDA Page 1 of 1 • 1 = N • J I j -J-_FJ • t--; • -4- it • rJY z ;-- rs-rr Q __ • Option 1: Slide aircraft forward to allow for over 16' clear at west side; Footing position relative to easement is as originally proposed. t RA•••-it'a-) *AA) 1-; 5 5 e..."1. -A L/ >> 1 ' s- •3/ , ...,- r, 1 .,..;;I:---.- \ , \ \. - --'„...... ...•/^.... ....- \ . ---_,-- \ \ -- - .•% V-,,:'''' ,, -• ,:\>,..).>,!,,' \ • \ , '• ;•.;'''.:',;,\ - - ,,,,,.....,•••:',.s / 2r. `..‘ • \ \ \'-' •-/-. 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Replace or reinforce pipe for area under/ near to under plane to avoid future maintenance. 1 11 I • • • • • • • z z N -r it • • • •Gr r r: firs % , - rrr ry r 1 /FX if- Fyrr'r ^A;. •••\ • \ • • • •, • • • \ ••\ \ ••\ \ •• • \ \ \ • `•�_ �` r`���r_f�,rf_ _� ,rte \U ▪ '` �. r � �-' �-r � 'r _ �. �" r - r -r'rs r J- r r1, s s ':t :r r , //rr,f• C r rs r rr -k'\ r f ?ss r err J_ _rte • .r f -- . •err fr'=_r�.rr -r � r r. r�r� �-r.t��-r J ...s • s_= risr /- 3 . 2E. l ttPE. ( P'`Jo`C> At2G(L -F-1"/ y'no-nr.1Css (wtw NEE V? -b P a jt Pc -1.5 E 0 t p W t ►moi G, G 0 61.7 \ • • ,\ \ • • Option 3: • • • Slide aircraft forward to allow for over 16' clear at west side; Re-route pipe so that it either: a- passes under wing tip or b- avoids plane entirely \ • • • Q - f / / f sr� J % s s -{-r 1~ Option 4: / reJ Slide aircraft forward to allow for over 16' clear at west side; Both footings on same side as easement; Distance from north footing to easement approx. 6' min. Wing cover over memorial area minimized. . _ _ _ _. -i- _ j /Wlf,t 7 / I I I Option 5 Maximize distance of footing to easement Pipe runs under wing, or - reroute pipe to run around the perimeter of the plane. 7 "ter-rcrc_„ • (i is G t71l-212- U,v nCZ- -''-2: (1-4,2-A STRUCTURAL CALCULATIONS Revision 1 B-52 Memorial Park — Phase II Museum of Flight Tukwila, Washington REVIEWED FOR CODE COMPLIANCE APPROVED DEC 12 2018 City of Tukwila BUILDING DIVISION REVISON. N May 30, 2018 RECEIVED JUN 00 2018 TUKWILA PUBLIC WORKS RECEIVED CITY OF TUKWILA JUN 04 2018 PERMIT CENTER DIS- 008 8 ■ MAGNUSSON KLEMENCIC ASSOCIATES 1301 Fifth Avenue, Suite 3200 Seattle, Washington 98101-2699 T: 206 292 1200 F: 206 292 1201 MUSEUM OF FLIGHT B-57 MEMORIAI PARK PHASE II M.AGNUSSON KLEMENCIC ASSOCIATES a The Museum of Flight is located in Tukwila, Washington, at 9404 East Marginal Way S. The current project involves the construction of foundations, pedestals and connections supporting a B-52 aircraft as part of a memorial park development. The design of these systems is summarized below. FOUNDATION The primary support of the aircraft is by four 18" diameter, 40ft long augercast piles foundations under each of the two main landing gear sets. These foundations are located adjacent to a King County storm drain easement, and augercast piles were selected to minimize disruption to the buried pipe. In addition, two small 6ft x 6ft footings are provided under the wingtip landing gear for additional stability and wingtip hold-down. PEDESTAL To allow the aircraft to be rolled in to place the top of foundation must be flush with the grade surface, and all pedestal components will be installed once the aircraft is in place. To minimize the duration of temporary support all pedestal structure will be fabricated from steel, with non-structural concrete encasement as required per the architect. CONNECTION TO AIRCRAFT The connection of the aircraft to the pedestal will utilize the aircraft's built-in jack mounting points. These mounting points are designed to support the aircraft at a significantly higher loaded weight than the as -installed condition, and will provide secure long-term support. BUILDING CODES The project is designed in accordance with the following building and material codes: BUILDING CODE Washington State Building Code, with reference to • International Building Code, 2015 Edition (IBC 2015) • State of Washington amendments to IBC 2015 • American Society of Civil Engineers, Minimum Design Loads for Buildings and Other Structures, 2010 Edition (ASCE 7-10) MATERIAL CODES • Reinforced Concrete: American Concrete Institute, Building Code Requirements for Structural Concrete and Commentary, 2011 Edition (ACI 318-1 1). Basis of Design Museum of Flight B-52 Memorial Park Phase II, Tukwila, Washington MAGNUSSON KLEMENCIC ASSOC:ATES • Structural Steel: American Institute of Steel Construction, Specification for Structural Steel Buildings, 2010 Edition, AISC 360. 1 OAfING CRITERIA A summary of the project -specific loading criteria follows. This loading meets or exceeds the requirements of the IBC, adapted as necessary for this non -building structure, and incorporates loading requirements specific to this project. RISK CLASSIFICATION The aircraft is not intended to function as a shelter. It will pose a low risk to human life in the event of a failure. Table 1. Risk Category Parameter Value Risk Category 1 GRAVITY LOADING The Museum of Flight has determined the empty weight of the aircraft to be 185,000#. SNOW DESIGN CRITERIA Snow loading is in accordance with the IBC and ASCE 7-10 requirements. Table 2. Snow Design Criteria Parameter Value Ground Snow Load (P9) 20 psf Terrain Category C Exposure Partially Exposed Snow Exposure Factor (Ce) 1 .0 Thermal Factor (C) 1 .2 Importance Factor (/) 0.8 Flat Roof Snow Load (P) 20 psf Basis of Design Museum of Flight B-52 Memorial Park Phase II, Tukwila, Washington MAGNUSSON KLEMENCIC ASSOCIATES The flat roof snow load of 20psf is based on a regional design value of 25psf multiplied by Is, and exceeds the value calculated per ASCE 7-10 section 7.3.4. The full projected area of the aircraft will conservatively be used for snow load calculation, ignoring potential reduction due to sloped slippery surfaces. WIND DESIGN CRITERIA Wind loading is in accordance with the IBC and ASCE 7-10 requirements. Design will be per Chapter 29 of ASCE 7-10, "Wind Loads on Structures and other Building Appurtenances". Table 3. Wind Design Criteria Parameter Value Basic Wind Speed, 3 -second gust UVJ 100 mph Exposure C Design Height h 40 ft Categorization "Solid Freestanding Walls & Solid Freestanding Signs" Reference Figure 29.4-1 Basis of Design Museum of Flight B-52 Memorial Park Phase II, Tukwila, Washington MAGNUSSON KLEMENCIC ASSOCIATES SEISMIC DESIGN CRITERIA Seismic loads are in accordance with the IBC and ASCE 7-10 requirements. Design will be per Chapter 15 of ASCE 7-10, "Seismic Design Requirements for Nonbuilding Structures". Site seismic parameters are based on the report for the adjacent Museum of. Flight Covered Airpark, by GeoEngineers, Nov 2014. Table 4. Seismic Design Criteria Parameter Value Building Location 47.517°N, 122.297°W Importance Factor (/e) 1.0 Seismic Response Analysis Type Site-specific Spectral Response Coefficients 544.5.= 1.091, Sas = 0.727 Nonbuilding structure type Inverted Pendulum Type Structures Response Modification Coefficient (R) 2 Seismic Response Coefficient C., = 0.364 Design Base Shear V= 67.3 kips Analysis Procedure Used Equivalent Lateral Force Analysis MATFRIAI S The material properties used for the design include the following: Table 5. Structural Steel Properties Member Standard, Strength Square or Rectangular Hollow Sections ASTM A500, Grade B, Fy = 46 ksi Miscellaneous Plates and Connection Material ASTM A572, Fy = 50 ksi High -Strength Bolts 7/8" diameter and smaller 1" diameter and larger ASTM A325 ASTM A490 Basis of Design Museum of Flight B-52 Memorial Park Phase II, Tukwila, Washington MAGNUSSON KLEMENC[C ASSOCIATES 0 Table 6. Concrete Properties Member Strength* Slab on Ground, Sidewalks, Curbs, Mechanical Pads f', = 4.0 ksi Footings and Piles fc = 5.0 ksi *28 -day strength, unless noted otherwise. Table 7. Reinforcement Properties Standard Strength ASTM A615, Grade 60 fy =60 ksi Basis of Design Museum of Flight B-52 Memorial Park Phase II, Tukwila, Washington Design Sheet MAGNUSSON KLEMENCIC ASSOCIATES ■ Structural + Civil Engineers PROJECT SHEET 1 LOCATION CLIENT DATE BY /OD -S2 C:akvUon S \"k: 128,0004 (ettpkd) Len 1Sa irJin Sion: i gS`0" pec : 4010" aroArktot oaC: rro yc flocs wee II mix u�cl.gor 111 1 i-� \1641 1$s ooVuo-&s : 64-7 low-a1401 oi,csse 1 IM,Cxo . 1\' 1zncks r ; 2-\, Ali M Molvi 11S 1ffeks - I . QSsU(L worn -E- cap 600 1 cco o. 66 12o) 2� . SOow oce: ¶co' M bin oC - 6578 At 2� 66 x Zo?s.Q = 132s6o . 13 2,h‘0. = 4b q56# 132700#'0.6,5= 86 164 5e15mic \cad ,,av erzec PQnotta v. J -6age IS. - =9 R Cs si'541()"2-/y/0 - 0.36 1W7ame .secsrnic 50. s;rnikwf 3-o OW( &7)C04 -7‘0.g 23jgci*3) Design Sheet PROJECT MAGNUSSON KLEMENCIC ASSOCIATES Structural + Civil Engineers SHEET 2. LOCATION CLIENT DATE BY ■ A\c), 1 oad oo(np\) Qsposutt C j Trc 6 a64e wrck• ?Qr iVT, cd,s 1116 tb' toa , 13 44 J 11•Zi) IF\s7 0•6s QCs -7 •�� -\or k-4 9eQc O(c' z r). 1G1 ,� c=0•0o256\C/_K�kkCd\l 1\ - V.002 lJ,1'04-,(1. ` lco.85?dOO2 V 34 cv 0.05 22•& psi )(O-gs,41.6 )(233 2 No -r6: Cc gMA-N6% AS y 4r fain 2-7\'\is ►; -;Pi no- („ 56r cteuanA- Mu�Or guy aG Q . D`i C e -to �('vt Ceox- seC) Ota C� kft �cP COCA: five' W 6" )(70.1k: ci • k -- •tQtt o.1 'k 10. x-12 . ";F tC Czar rAccotno e V \0H a 613 use 4Nse. 4(- / • Design Sheet PROJECT SHEET 3 MAGNUSSON KLEMENCIC ASSOCIATES Structural + Civil Engineers LOCATION CLIENT DATE BY ��� Nt ccq- CalSed %a o�b�e WW1 37 41l ,� Mdu_ 't� 1fountlfI dt(*, \E(Z. Sia Lrct) COUN-T ?cov;ck C4) Igp .(fOt Ian au arras � ?Iles les 1 ;'fin. ctrcAt : alz.Ts 4c- ll ---berm & Q \oacb -Qo r Slotk •\¢f rl Vv 1\4 CMS. 4,D \1QA-tccti \cad • i_ a R3 � 44or,20n-W Ick: V V Lv 0.141.7-1-1 D RSR or PoREtAcT: \'o 2.5o 91a: (10 )215) wg) IVCOM �1091a='14e15S4a X2.112 SNS Ion: 901 e/c : g63 7 S = =" I4 = (1) • IZ �ti1NJ ,QAD QAZ. PQ- 5Ct. k WcAtvERT = 0-Kgl`Sc1.1k = 2s•512- W7r6R,Hotia = x5q. k d 14 • c Design Sheet MAGNUSSON KLEMENCIC ASSOCIATES ■ Structural + Civil Engineers PROJECT SHEET L+ LOCATION CLIENT DATE BY E &Mlc L R. GaStAMC : �1 1 .Q1612., _ - 4-V7-1 4 - \©• 0. qtAS-- oho cQnsiCfr ; 0•2Sos. 41ade in O. -ZA- O.I4-5 Calc�o-�e p,er c/morr9,s uncG�� load cornDos 'D x-2.1 \2- "DiS 1-11'2-421'x\& D40.6W: [4-2.112. + 9.512,en.& T)40.q6 41112.04o-gyo. J } o. --x Iq'A. 0-01O.6\ • O'S'(4.2.I}Z --0-&)(%.S 2- 0.&D+o'7: Lo.b-ccIttclo.7)- o' g.712. (11-) lg Piers capaci7is nod Ased pcovick adliate. sceN30(4. 'ted Garbs Pier Dcztis\ ,hs PcN\ 6s2.. (_6) 442- va-k docs w/hz}Z-bp. PcoMQ, 5? -‘c4 07\49494- ?A6), z\e. uk',t01 tarc4cciq ?Qv-- Ib•10.3•q•q•2: -�� �rt°447(�-� m 0.103 J 0.005 Design Sheet MAGNUSSON KLEMENCIC ASSOCIATES ■ Structural + Civil Engineers PROJECT SHEET S LOCATION CLIENT DATE BY o\gsk, ax\-Qnftg.. --(G61Q, (ct.)Qk.� � o ;0(.1'. r c 11 Int o.�, 2i\ ' -1 4 - 0.02 »� 60 x12. 0.0125 (b) o•oR= O•octrt z 0.00 •21kk : 30 •8 =1 C 406 nr; PtSINJ 0.0 \IC)4 d-.1 x 4" . o • Go 4) ;CO1 4 CQ • 31 e O.62 c)m\cicl. may cDc INtftek 1 6tk:,coo ro educe. g ccS sem; ?cr fig. .�•�. y a dict : 1c3474 _ • S Ti)0) c).-4/93( .c‘ c) (.1449 r. ok( ID(Nor Design Sheet MAGNUSSON KLE VIENCIC ASSOCIATES ■ Structural + Civil Engineers PROJECT SHEET 6 LOCATION CLIENT DATE BY ---11k Gf 1.4D : \. tof •I�a 584 oo NkoM6N K 1.242.11.+i•VD•a. = q -°q N� ! 7MN't 1.2(b(2.1 k) I• opc2C•1R. 76.cAl Per I.. i 1e. f eackj %ay: G ja -i n @tic' k4- 0.qpi\Ofi aI.01(2c SI( k4e ft.?0A, RAV1/4x I.7-. •�� (.1.?_i0.14C)442..le Lg• �.31� \)P1L 10.qk. ?or LPi1 t t10A, Rnac Li -co %pi(, 343 ),Q.4 0.aD41-cc: CD •Q -o •14-s)x42°in. -11;.71z - 13.1 L4 \k t'Q Q() Rocky ocky '+Olz.• 1f) M) (5;.c1) 73) LBVt) LI24) 514) 1.5) b•),37.$) 0 o y o x 0 0 0 18 in diam. Code: ACI 318-14 Units: English Run axis: About X-axis _Run option: Investigation \. _.enderness: Not considered Column type: Structural Bars: ASTM A615 Date: 04/25/18 Time: 12:41:34 fs=0.5fy; fs=0 fs=0 fs=0.5fy P (kip) 1200 — (Pmax) (Pmax) -160 (Pmin) -200 — 3 '4 (Pmin) fs=0 fs=0 fs=0.5fy fs=0.5 160 Mx (k -ft) STRUCTUREPOINT - spColumn v5.10 (TM). Licensed to: Magnusson Klemencic Associates. License ID: 65542-1052901-4-1 D9EC-1 COEC File: I:\MoF-T1s\B52 park\180425 18in pier.col Project: MoF B52 Park Column: 18" augercas fc = 4 ksi fy = 60 ksi Ec = 3605 ksi Es = 29000 ksi fc = 3.4 ksi e_yt = 0.00206897 in/in e_u = 0.003 in/in '\eta1 = 0.85 Confinement: Tied phi(a) = 0.8, phi(b) = 0.9, phi(c) = 0.65 Engineer: RPB Ag = 254.469 in"2 As = 2.64 in"2 Xo=0.00in Yo = 0.00 in Min clear spacing = 4.25 in 6 #6 bars rho = 1.04% Ix = 5153 in"4 ly = 5153 in"4 Clear cover = 3.63 in • Design Sheet MAGNUSSON KLEMENCIC ASSOCIATES Structural + Civil Engineers PROJECT SHEET g LOCATION CLIENT DATE UY ?ac. ,`?Cc\u An otn l5., (b) cap ac 6 cad;cZa a19/Aak U¼eR P6S61\kb17/ gt 641a) • e �� : 33�4 s 14 33 %gin 14. b3 iO x(o ! t•39 Trsv +cl•S 5 61 0.G1 x17.2\62'CeoW —M cart _7 t - ille� c 11 acoutd. Ow ca . (211,2_1'14.S. ,+•6 -* :I . (Y� 1\itt="4>< MA S" .7 /2,1?))Z. -------;-> -- - rN\r\Ck c)Lik° '''\)r< /01' :.--. 0E1 u O'ClycZZ\ vV, 16' 2 o 1R.-11^ .c OK \ i Design Sheet MAGNUSSON KLEMENCIC ASSOCIATES Structural + Civil Engineers PROJECT SHEET 9 LOCATION CLIENT E,rbdt P‘ock: 'Dc?q(\ dow H;S �o m anchhcs 4c- \ ooc,) DATE BY be tomked an1,4am on k\12_ embed Ma I:1 wAA add ora. S8Q 4 bel� q17- Q-• j(1 i1 k.;(\:0.a� s\ _,12'`ts 'i..S2 Pco\ktk VL 2�• CIO ondws ac' act 6 6d, (cc: Q l) 4f..35 `? , - k 'opkor. Ism 41tottAs PC0v1 1 'r2 76 pg,ct Gcack -.1417 S8 fZs, cdQ„ (';5i-zr,(o.F5rs) 51,-; Op. We.1cC embed dor AIL cQj acc 0.4g.40.6%66), (.cc1 I.S1r) 57.7 Vk a 0.4c €' use. M(c). OK i V. Design Sheet VIAGNUSSON KLEMENCIC ASSOCIATES Structural + Civil Engineers PROJECT SHEET 10 LOCATION CLIENT DATE BY Olt? DesIcktv DIA v (Loc /2)t) v sper) ga)c no-Ptondr load as p .44.1,,t17g6#1.6i6.1.) :1'4-0.1 12 c‘)c t/04-amA 1oc 036Q : 1.2_D+I•cM 9 21D 1.1 \z =Mtik=i7o.11,,Cg(4\ 20'144.4- ± 11.q '23TA.1k..q) ss.3 )z41() 11(61_ Mt4r1D1'11Z)7: —G7spc2-St7 Sfb5 _D•2_. Q-4 14 14S. c -237i2i4 Design Sheet MAGNUSSON KLEMENCIC ASSOCIATES Structural + Civil Engineers PROJECT SHEET 1 LOCATION CLIENT DATE BY ick Min NOV' As 2 21 Pos-4.1\)Q_ Nkciv4; MAcky VI( ve Mo: O\Se._ ,U� Mbase 2t . 6' X(o°a,°20(a °q)(7akst) Q.Lf V`i'i .;0 "Tiansvcm cAsa 12. 56c: y) 0.-4 s 2.,170 r2 -1',c.42,‘ 1Q0.3 Design Sheet PROJECT SHEET t LOCATION CLIENT DATE BY MAGNUSSON KLEMENCIC ASSOCIATES Structural + Civil Engineers _2 hold-down: a, Ick ot.4SlgP wind v 185,0#x('°°'"P�{p1)2 : 10q) ,WC) uiligt 1x -15'A (11\ 10 SlyiTY443;11. %,\)( -Val) crec1 locAokllt RN"='51.7sIzsis 3.6 .g* S \Ok 041 . tm4& x61 1,7 0:‘ covq) avc. 6'4 '2 4O o t\SOpc-- 13, 9-044 C1tc I- 4(2111041s°) sig s� \,„. x/),'Al2.\ ' 3 6.2111. Ttk,, •ilDilk"4 PM° 'CI 'a* -ft x;NO•a)41)cq" z pamcca.�L 3"c ��� LL ver) 44-14 4-16 i q ?dctila @i2"0/e. 9S09180955 FiecoFd--At i egrsestOf Et. 620a King County Property Services Division Eminent DoaitgCEIVED SEP 14 2E3 COMMUNITY MODIFICATION TO SUPPLEMENTAL EASEMENT FOR UNDERGROUND CLOSED ORAINUNE erEVELOPMENT8 Rhone-Poulenc Inc.. a New York CorpereUon 'Grantor% authadzed to do business In the State of Washington, is the owner of record of a certain poral of land located in King County, Washington end which In subject to s certain comment attached hereto as Exhibit A (the 'Property'(. Rhena•Poulenc Inc. purchased such Property from Monsanto Company by deed dated September 28, 1988 end duly recorded on October I. 1980. Monsanto Company, a Delaware Corporation, the former owner of the Property. and King County, Washington, a munidpal corporation of the State of Washington ['Grantee'(, executed s supplemental moment dated July 29. 1971 to construct. operate and maintain one underground storm drain outtsll Otte ('Underground Facities, together with dghts of access to and from the Underground Fedgdes which aro described In Exhibit A. Grantor as the successor In interest to such easement. and Grantee hereby agree to delete Paragraphs 8 and 7 of 11t supplemental easement and replace them as follows: 8. Grantor shall not construct buildings aver tho Underground Facilities unless written permission Is given by the Grantee. The Grantor may, with Grantee's written pennlaalon, relocate the Underground Fedildu at the Grantor's sols expense to make room for the construction of buildings. Grantee's written permission hereunder eh&1 not be unreasonably withheld. 7. Two sero sewer connecdons will be furnished to Grantor along the Underground Facilities at such places and st such time es Grantor may desire provided that Grantor shdl allow only dean storm water ss defined by Storm Water Regulations In effect at the time, to enter Into the Grantee's Underground Fscillties. Said supplemental easement shag. In all other respects, be end remain In NO force and effect. IN WITNESS WHEREOF. the parties hereto have executed this Instrument by their proper officers the eunto duly authorized as of this day off . 1996. CORRETION LTR# Nes-- 00S64 044854110 EXCISE TAX NOT REQUIRED Kim Ca.RetaroeMem eR%txtur watt KING COUNTY, a Political Subdivision of the State of Washington BY: _ .i .... DATE: St !Pr /2? 4' APPROVED BY CUSTODIAL AGENCY: King County Intemedonsl Airport BY: "" Manager DATE:& / :A /41 APPRO_V LJ S TO FORM: BY: Sr. Oaputy Prosecuting Attorney DATE: 7- AT - !r— 15 V a 5 8 REVIE D FOR CODE CO PLIANCE APPR • VED DEC 1 City of BUILDING n 2018 kwila (VISION RECEIVE CITY OF TUKV%IILA JUN 04 201 PERMIT CEN STATE OF lieu Jersey COUNTY OF Middlesex On this day personally appeartd before me Mg" C. ttcLaugh1in to tae Down to be the Director of the Real Estate 3 Fat. Dept. the executed the foregoing instrument, and acknowledged the said instrument to be the free and voluntary act and deed of said corporation for the uses and purposes therein mentioned and that he was authorized to execute the said instrument. GfYEN under my band and official seal this day of .." ' .19 217 OTAIYPUBLIC its and for the State of rcsidIng at 3 c T My appointment .. .� �.e�;e 441 OWNS &wlEFEIRo Nemo MIK Stab et Roe Amy Cagey dwniirea brims New 111117 STATE OF WASHINGTON ) COUNTY Or KRIC )ss 1 certify that signed this insnsrment. on oath stated drat authorized by 1l! the Kin. Sammy FzerntIrs to execn!e the instrument, and ed it as the fpr of . , , .- „ . of King County, Washington to be p the free and voluntary net of said County for the and purposes mentioned in the instrunseot. CD NOTARY PUBLIC in and for the State of Washington residing at . My Date: appointment raphes STATE OF WASHINGTON ) ss Cowry OF MG ••• Aert 1 certify that rerofef,A1 MDT'sloped this instrument oo oath stated that she was authorized by the Pittway Ezeattive to =UM the instrument, end selmolviedged it as the Actint_Mankser of the Priam, Sertlea Divisitmof rag County. Washington to be the free and voluntary ea of said County for the ma and mole thendoned in the instrument Date: r/Ifigr WeaTapilm IMS) 9501610955 724 NOTARY PUBLIC in and Washington raiding at My appointment expires tate of l-1 EXHIBIT "A" DQ Jc ? UNDERGROUNDSUPPLEMENTACLOSED DRAINLINE .L EASEMENT 'FOR • �(%. X4":1 O4 RT. KNOW-ALL HEN BY' THESE PRESENTS, that Monsento'Company, e .Delaware 'corporation (hereinafter celled "Grantor"), for and In • .•consideration of the sum of•Ona and No/I00 Dollars (SI.00) and ••other valuable consideration In hand paid by King County, Washington, •'• a municipal corporation - i on, of the State 'of .Mesh i ngton (•here 1 na�f ter • '• :'-:.•cel 1•ed "Grantee"), the receipt. of :which la hereby ocknowlodged, '. , ▪ does hereby grant, subject to The termi, roservetlons,• covenants 0 :• and conditions hereinafter set forth, and Without any warranty, • ••: express or Implied, unto'aald Grantee, ifs successors.end•assigns,• . 43's o non-exclusive easement to, construct;•operate, end maintain one •C3 underground,storm drain outfall line;• consisting of 36 loch diameter. .., concrete tile and appurtenances thereto •(hereinafter celiac!' • • w nUnderground:Facilities"E:together•wlth.the right:of •access to. ., ;;•and •from .the Undargrcupd: Fael I itles over. other lends of Grantor, ' subject to the provisions hereof,. In, under. end across the ,fol loving.. • ▪ descrlbed•land, sltuated•In King County,• Washington, 'to -wit: ' •• • • • . ;A strip of land ten feet In wl.dth, being five feet on.either s4de•of the following described centerline: • ''.'Beginning at the Intersection of the North line of :No..2 Tract, Meadow's Addition, Francis McNatt O.L.C. No. 38, and the West right-of-way line of East ;'•Marginal Way; thence West along said North line o.f said tract 11.5 foot to the•Point of Beginning. . • • Thence South 39°08'57". West 758 feet more or less to • ..?:the tide water•of Slip No.'6 of the Ouwemish Water- ' .way. (heroin called "Easement Area"). The bearing of • • East MargIneI Way Is'•S23°41'03'!'E. The above described' tract Is a part of Tract No. 2, Needow's Addition, ' •Frenels McNatt D.L.C. No. 38, Section 33, Township` 24 • North Ringo 4 East. • • ' • •••.Grantor further grants; subject to the above and•to all • • the terms••end, condi•t•Ions' horeof,.the tompo.rary, easement .50 teat • ▪ In -width, fof purposes gf construction, lnclud)ng.ths:tlght to locate equipment and to work on saidlend es moy be reasonably,•. • • ::necessary to construct said•ilnderground Facilities. This ease-'• -• merit shell explre•upon completlon of. installotlonof tho•Under -. . ground FeclI l'tlos. , • • TO' HAYS ANO TO HOLO the above described easement and rights unto the sold,Grentee, Its successors.snd essigni, subject . to the foregoing and to'the•following tormsr reservations, covenants and conditions:. . , . • • . - • The•r1•ghts privileges and easements herein.granted ' • ire subject to"any"end Mil -existing restrictions and encumbrances, ,or.oxlsting rights or• Interests of any third persons or parties, • •, •• 411.-.:14, 1 .:1 n, to or •affecting any:of se:i d above desCri ped, l end, •whether or•• • •�'~' not of. record; O`' " 2 .Grantee shelfbe liable for, and 'hall Indemnify end. :. ! .'hold herml'ess Grentar .from and against, any 'end•:ail I lab i l it !`claims, suits, judgments,,daisegos, losses, costs end expenses on .. • ',Vaccount of Injury to ordeath of any person, or damage -to or loss • '• or destruction of any prop.rty, caused by or connected vlth' '; .• .. Grenteoss .exercise or purported exerclse,of: any of the-Tights, .::z:prlvl leges end easements, herein granted, or of any'act, omissl•on : ' . ...tor neglect of Grantee, Its agents; eroployes,•.Ileenseen or•con- "5.»treetors, Inconstruet.Ing, operating and maintaining said,Under- •. . ::.ground Fact i Itles .or any pertf; tbereo:provided, •however; the ':.:toregoing covenant shelI•not apply 'with respect to.'en.i. such Injury, %deeth..demege, • loss, or •destruction caused by the. solo -nog! Igence. . - .:;n1oGrantor; .Its agents, contractors Cr employes. .• • • • ' • .j; .During e11' periods of construction Cr. repair,' the - ' fol.lowlig'provlslons:shell.be observedby_Greitos,:Its agents, .employes or4,controetors et all •t t moi i : ' . ' •. • .1i•1`:'".: `•11I0i' Tie drlverays I'n'•I'ocat#Oas setisfsctory to Grantor, " • -"",'•e•!r -:•.aria ofediquetd wItli end urfae condition to 41,1:41V.11�Vi `'` "'eIo lr'sdiqueii'free end u,Jntirrupted passage of. •h' 1i''"�'•'!"•!.:' ;"' '=1Dotdr.�eh'I'eles t0'end •'frodl Granter's pient or • ' 1'%:!-•, %:1•rl''••. ps'rk.ing'sriei'on Grantor's pivots's over end' a r.•..';.••;••!.1.1.)...:•-• •:°creeithe •£diement Arai from East Marginal key, ' . • `••' •: if 1' Greeter shel•I gIva 'Grantee wrltten notice of .any • • breach or violation of the provisions and require- • • ••• • meats•of thli paragraph within 30 days atter the • ▪ • • shal•I be of a nature •whleh Is not Iamiedietely dls- •. covereble by Grantor, wlthln.30 days after such • • • . ...discovery. -If such .notice dhal I not be given', -, • ,occurronce•of such violation; or, if such violation ' •'" :. ' • ' •.:.Grantor •shel 1 'be deemed to have we tired such viorstlon. '• ., rCg) Upon completion of any construction, -Inspect loa,,or • ••,'?=:� :..:`' ,.maintenance work -'in the Eaeisent Area. which resiutte ,„. - . ; 's •,� t t .• ..:..1:.*... T. �;r "'in any dIstutbence of the soli: or any plant 'l lfe • �;•;.:t.1'• ▪ :or, vegeta ion hereon. Grintes she l re lac sed woos set the so 1 and shell restore the -surface theriof. • 4:1.....e • �Y` ;•� • 'In and -to es good a •condition es before. the die- . ••;•;_?+ •▪ *'•.'turbencs, Iiaving• .the same In a neat Ono clean con- ;ditlon. •Grantee shall'.replocw any exlating fence •- ` •. - owned- 6y Grantor and removed or damaged `by Grantee • • with feces of •cosperable'qua• 'ilty: • • '1'� 1 4 , In the event Grantee, Its successors or ass Ignl, ahel.l. - :..aeandon the uss•ef said Underground facilities, In whole or In part, • -"-from the Easement Area or any portion thereof,- whether voluntarily_••. ,'; -gr•pursusnt. to 'paragraph 6'hereof, the rights. prlvl leges••end ; . . - . . :-..• ''.'..easements granted hereby,, es' to the portion. or -•: port ions so . . f-_• • abandoned, shall .exp Ire.. and terminate at the tiate each such'portlon: r•:`; Shell is.so-abandoned, whereupon Grentor',_•.tts successors end `': " . =• nd com assigns, ;shalI ▪ have the:saoe and to such lends s0 •• • .:4 • S., This Instrument' end all of'the terms; covenants end:• ;}:•••.provisions hereof shall Inure to the 'benefit of and be bindings.... • '•.:upon each of the perttes'hereto and their respective legal repro- • • • :"6 sentatives, successors and assigns. • •• • 6. At any time' or from time to -floe upon•request from _ • . . ::-: • • '';c • • dated' the 28th' day of March, 1932; '' of footing. the Easement Area, . . , .recorde0 in the office of the County Auditor, No.'2716188.• ' IN WITNESS WHEREOF, the parties hereto, hove executed. it otfleer$ the�euntp'duly sutborlsed' • ....title iNstrurent by .their 111:Opi •es :of this •1� day of �t•% .. 1972. .. MONSANTO COMPANY . • • " ATTEST:.� • • • In • o• • . ATT •T. 15 ,, an ecretary.• _ ••,. KING COUNTY • 1 • • STATE OF MISSOURI 1 • . 1 COUNTY OF ST. LOUISI On "this....-21=day ofa. , IOU, Wore perfonel I appeared j.:00 G� �-�+•1+-+✓ : , to me Known to be thv P esldsnt of the corporation that executed the within and • foregoing Instrument, end ecknowledged,the sold instrument to los •the free and voluntary sot and deed of said Corporation. for the uses end.purpoais therein mentioned. and on esti; stated that he O- was authorized. to execute said Instrument; *and. that the• seal CD' '44 •effIxed ip the seal of,said corporation. • •. In•witness -whereof I;hereunto sat ay hand and official seal's- • 1.• r . otery`Public In and for the • • State f M[ssourl, scalding 'STATE OF WASHINGTON) ' I •: COUNTY OF ICING I On ibis,. Q *day of , •c?L f' , 1972, before ae personallY appeared /7D.LJtto ''1.4).--(49W-6', to no known • to 14,0r,4 uAt 4l." of /C'/ /f- 4.40rp • that executed the within and foregoing instrument, end acknowledged the said instrument to be the free and voluntary net and deed of -said ,f4 /1.)+-.�21,r'4 ., for the uses end purposes y • • • therein mentioned, and on oath stated thea he was authorized to' 177) execute laid Instrument, and that the see& affixed Is the seal' CD. : (itJD 610:f, -J � ' of sera . • C• In wttness'wbereol 1 hereunto set my hand end offleli, )eel . . • • . ,4 . .f. ity of lukyvila Department of Community Development - Jack Pace, Director NOTICE OF COMPLETE APPLICATION April 23, 2018 Mr. Stanley Jaworowski SRG Partnership, Inc 110 Union Street #300 Seattle, WA 98101 Subject: Museum of Flight B-52 Memorial Park Shoreline Tree Removal and Vegetation Clearing Permit #L18-003 Shoreline Substantial Development Permit #L 18-0031 Allan Ekberg, Mayor Dear Mr. Jaworowski: Your applications for a Shoreline Tree Removal and Vegetation Clearing Permit an Development Permit are considered complete on April 23, 2018 for the purposes of meeting state mandated time requirements. REVIEWED FOR CODE COMPLIANCE APPROVED DEC 12 2018 CBUILDINGTukwila 1V a • 11 • This determination of complete application does not preclude the ability of the City to require that you submit additional plans or information, if in our estimation such information is necessary to ensure the project meets the substantive requirements of the City or to complete the review process. This notice of complete application applies only to the permits identified above. It is your responsibility to apply for and obtain all necessary permits issued by other agencies. Please feel free to contact me with any questions at 206.4333162. Sincerely, - Lynn Miranda Senior Planner ttt RECEIVED CORRECTION CITY OF TUKWILA LTR#_,____ JUN 04 2018 PERMIT CENTER Tukwila City Hall • 6200 Southcenter Boulevard • Tukwila, WA 98188 • 206-433-1800 • Website: TukwilaWA.gov CITY OF TUKWILA Department of Community Development 6300 Southcenter Boulevard, Tukwila, WA 98188 Telephone: (206) 431-3670 AFFIDAVIT OF OWNERSHIP AND HOLD HA PERMISSION TO ENTER PROPER STATE OF WASHINGTON COUNTY OF KING The undersigned being duly sworn and upon oath states as follows: 1. I am the current owner of the property which is the subject of this application. OBE REVIEWED FOR COMPLIANCE APPROVED DEC 12 2018 City of Tukwila BUILDING DIVISION 2. All statements contained in the applications have been prepared by me or my agents and are true and correct to the best of my knowledge. 3. The application is being submitted with my knowledge and consent. 4. Owner grants the City, its empty ees, agents, engineers, contrasjors or other representatives the right to enter upon Owner's real property, located at'1 305— Mcofi.A. t i✓. s. h. kw:L. WA- ` lag for the purpose of application review, for the limited time necessary to complete that purpose. 5. Owner agrees to hold the City harmless for any loss or damage to persons or property occurring on the private property during the City's entry upon the property, unless the loss or damage is the result of the sole negligence of the City. 6. Non -responsiveness to a City information request for ninety (90) or more days, shall be cause to cancel the application(s) without refund of fees. � l A M EXECUTED at / Kiel/ (city), W4 (state), on a rc4 2 Z , 20 Notary Public State of Washington VICTORIA A JOHNSON . My Appointment Expires Feb 10. 2019 /14#hew EAyes (Print Name) / q (,` /144/1441,,,%/r,,r / W47 S. l t�4cu.i4 /Js, 1/ g%O� (Address) 2r'6--76'-.377 (Phone Number) (Signature) On this day personally appeared before me 7 d A€,tv �-l' to me known to be the individual who executed the foregoing instrument and acknowledged that he/she sign same as his/her voluntary act and deed for the uses and purposes mentioned therein. SUBSCRIBED AND SWORN TO BEFORE ME ON THIS '' •X'CiI� -Wi ' , 20 1 NOT 613L C in and 6yth .;te of Washington resit at �4 �, M Commission expireseson ycVi2raA., jtintiolblot- 00 03 CITY 0 TU MAR 2 6 2018 PERMIT CENTER STRUCTURAL CALCULATIONS B-52 Memorial Park - Phase II Museum of Flight Tukwila, Washington RECEIVED CITY OF TUKWILA MAR 26 2018 PERMIT CENTER March 23, 2018 REVIEWED FOR CODE COMPLIANCE APPROVED DEC 122018 City of Tukwila BUILDING DIVISION bB 0033 ■ MAGNUSSON KLEMENCIC ASSOCIATES 1301 Fifth Avenue, Suite 3200 Seettle, Washington 98101-2699 T: 206 292 1200 F: 206 292 1201 MAGNUSSON KLEMENCIC ASSOCIATES MUSEUM OF Fl IGHT B-52 MEMORIAI PARK PHASE 11 The Museum of Flight is located in Tukwila, Washington, at 9404 East Marginal Way S. The current project involves the construction of footings, pedestals and connections supporting a B-52 aircraft as part of a memorial park development. The design of these systems is summarized below. FOUNDATION The primary support of the aircraft is by two 1 2ft x 15ft foundations under the two main landing gear sets. These foundations are located adjacent to a King County storm drain easement, and have been lowered to ensure that no surcharge bearing pressure due to the footings is applied to the buried pipe. In addition, two small 6ft x 6ft footings are provided under the wingtip landing gear for additional stability and wingtip hold-down. PEDESTAL To allow the aircraft to be rolled in to place the top of foundation must be flush with the grade surface, and all pedestal components will be installed once the aircraft is in place. To minimize the duration of temporary support all pedestal structure will be fabricated from steel, with non-structural concrete encasement as required per the architect. CONNECTION TO AIRCRAFT The connection of the aircraft to the pedestal will utilize the aircraft's built-in jack mounting points. These mounting points are designed to support the aircraft at a significantly higher loaded weight than the as -installed condition, and will provide secure long-term support. BUILDING CODES The project is designed in accordance with the following building and material codes: BUILDING CODE Washington State Building Code, with reference to • International Building Code, 2015 Edition (IBC 2015) • State of Washington amendments to IBC 2015 • American Society of Civil Engineers, Minimum Design Loads for Buildings and Other Structures, 2010 Edition (ASCE 7-10) MATERIAL CODES • Reinforced Concrete: American Concrete Institute, Building Code Requirements for Structural Concrete and Commentary, 201 1 Edition (ACI 318-11). Basis of Design Museum of Flight B-52 Memorial Park Phase II, Tukwila, Washington MAGNUSSON KLEMENCIC ASSOCIATES • Structural Steel: American Institute of Steel Construction, Specification for Structural Steel Buildings, 2010 Edition, AISC 360. 1 C)ADING CRITFRIA A summary of the project -specific loading criteria follows. This loading meets or exceeds the requirements of the IBC, adapted as necessary for this non -building structure, and incorporates loading requirements specific to this project. RISK CLASSIFICATION The aircraft is not intended to function as a shelter. It will pose a low risk to human life in the event of a failure. Table 1. Risk Category Parameter Value Risk Category GRAVITY LOADING The Museum of Flight has determined the empty weight of the aircraft to be 185,000#. SNOW DESIGN CRITERIA Snow loading is in accordance with the IBC and ASCE 7-10 requirements. Table 2. Snow Design Criteria Parameter Value Ground Snow Load (P9) 20 psf Terrain Category C Exposure Partially Exposed Snow Exposure Factor (Ce) 1 .0 Thermal Factor (C) 1 .2 Importance Factor (/SJ 0.8 Flat Roof Snow Load (P) 20 psf Basis of Design Museum of Flight B-52 Memorial Park Phase II, Tukwila, Washington 7 . / MAGNUSSON KLEMENCIC ASSOCIATES n The flat roof snow load of 20psf is based on a regional design value of 25psf multiplied by Is, and exceeds the value calculated per ASCE 7-10 section 7.3.4. The full projected area of the aircraft will conservatively be used for snow load calculation, ignoring potential reduction due to sloped slippery surfaces. WIND DESIGN CRITERIA Wind loading is in accordance with the IBC and ASCE 7-10 requirements. Design will be per Chapter 29 of ASCE 7-10, "Wind Loads on Structures and other Building Appurtenances". Table 3. Wind Design Criteria Parameter Value Basic Wind Speed, 3 -second gust (tr9 100 mph Exposure C Design Height h 40 ft Categorization "Solid Freestanding Walls & Solid Freestanding Signs" Reference Figure 29.4-1 Basis of Design Museum of Flight B-52 Memorial Park Phase II, Tukwila, Washington MAGNUSSON KLEMENCIC ASSOCIATES SEISMIC DESIGN CRITERIA Seismic loads are in accordance with the IBC and ASCE 7-10 requirements. Design will be per Chapter 15 of ASCE 7-10, "Seismic Design Requirements for Nonbuilding Structures". Site seismic parameters ore based on the report for the adjacent Museum of Flight Covered Airpark, by GeoEngineers, Nov 2014. Table 4. Seismic Design Criteria Parameter Value Building Location 47.517°N, 122.297°W Importance Factor (4) 1 .0 Seismic Response Analysis Type Site-specific Spectral Response Coefficients SMs = 1.091, Sas = 0.727 Nonbuilding structure type Inverted Pendulum Type Structures Response Modification Coefficient (R) 2 Seismic Response Coefficient C5 = 0.364 Design Base Shear V= 67.3 kips Analysis Procedure Used Equivalent Lateral Force Analysis MATFRIAt S The material properties used for the design include the following: Table 5. Structural Steel Properties Member Standard, Strength Square or Rectangular Hollow Sections ASTM A500, Grade B, Fy = 46 ksi Miscellaneous Plates and Connection Material ASTM A572, Fy = 50 ksi High -Strength Bolts 7/8" diameter and smaller 1" diameter and larger ASTM A325 ASTM A490 Basis of Design Museum of Flight B-52 Memorial Park Phase II, Tukwila, Washington MAGNUSSON KLEMENCIC ASSOCIATES e. Table 6. Concrete Properties Member Strength* Slab on Ground, Sidewalks, Curbs, Mechanical Pads f'c = 4.0 ksi Footings f'c = 5.0 ksi *28 -day strength, unless noted otherwise. Table 7. Reinforcement Properties Standard Strength ASTM A615, Grade 60 fy =60 ksi Basis of Design Museum of Flight B-52 Memorial Park Phase II, Tukwila, Washington Design Sheet MAGNU S S ON KLEMENCIC ASSOCIATES ■ Structural + Civil Engineers PROJECT SHEET LOCATION CLIENT DATE BY 1W) aka/400S Wek \SS,000-1' (ern Len IC(' L WV\ S' : I gS‘0" Pe; L.: 4t0" arav; \ood: Froc1� t�eor uet wee i Th eor; assot 101 IA%hw ISS 000-3s : 6i, Igs aoo6o.6 lip. Snow ioctj: PCo lzeW 1GG(1 act 662 2 G6 �k x 2ofs.Q = k l6G0 a.fic04-x0.% . Itb q56# 132, c(*0.66 = 86,164.* Setsrni c \006 ; "nvected, P n�� - age IS -Lt Cs Sa5A(y) = (7.20-4) - 0.36if .5r,c IS,00c A%ume Setsrnic 11- s'Arn;`of 3ittut G7) 3c047,0. = 23j601# 67 004.v0•G- 1+3) 7 I low -all . Gitc.weJ n lzrtAs Fer ; 2-4-j Ali 11-4 Mc ci, IIS <4s = I rd+oh. 60, Design Sheet PROJECT SHEET MAGNUSSON KLEMENCIC ASSOCIATES Structural + Civil Engineers LOCATION CLIENT DATE BY ■ \C1; IGOI \)ex suCL CJ Tri ct .1Il600, lam` coaJ x 13` 1cdt, abe room . t P,71�i s�13) h=lq OCi�tl 9xOy&ok ()Rot = X22 J2 CV\ 7_ o • oa 2sO K /_ K kC, J , Gich 0.002 ,(1.04-icl.Govco.85 too' s" Cv 0.05 Qs� X o•gs,e14fc2Vo-R2- no -c6: Comizto-N6j AS y C to -4r oriqa otC641 skq. 2/1f\-ti1O Is; ��p (10 rekeueok-A, fpc(\oc. o glJ ketc o Dtdcbilt co or ccaksea O(\ Caret Ie. MCA: iktk6 C1 og4146"h O412 1 56 Ci0Dc't ",fr Ut l Uc 1 Czar W rroctS1G U i ccrlkc013 use k\,%93e. Poc- Design Sheet MAGNUSSON` KLEMENCICy ASSOCIATES ■ Structural + Civil Engineers PROJECT SHEET 3 LOCATION CLIENT DATE BY Nccco, ct:sed ?` above rote. Lk!' Tacit— kv - �Movnk.� n 90i4 Goc ok ions . 16OOps4- ton -pct 0.CCOpsQ 61d A---ke m. gt5s.\v e : 2OXJinog U cczcon: 0• Y aST \2O226,,1&kp20G,A4 14-14-4 _ U L ' l 12' ' �� w\S elSmoc Cases-. J Pio - 0 • G)( tiv\nc1 cos 0•C =O•&X 122T1 =7-2;x- 1.01) p-11,0 2 Pay 141 c‘Tpe easemik - -----) -gig 1o'44‘ = 601• 04n aad' 1 load no, ticsal 11;-f(St Design Sheet MAGNUSSON KLEMENCIC ASSOCIATES Structural + Civil Engineers PROJECT SHEET CE. LOCATION CLIENT DATE BY 5o1124 load 1():)(1 -CA-1 g 2S° at. �l Six = 6 ��1�12rIS� � 360 �-E3 s = � ��1,�tSXis) :450 A3 —ood 011; �=36D(cos(.21+44ts1nL251Z_ 36�-E3 q7[}2-.4 3 1332i13+G6gfSC_ 2W0 psi Cvck cxthr D•60; 0.6 vIS' 1 1401 s� Ki Design Sheet MAGNUSSON KLEMENCIC ASSOCIATES ■ Structural + Civil Engineers PROJECT SHEET LOCATION CLIENT DATE BY 1-vod '/ct tio\A: 1./7( 6.6g?s-c' +('4.6)K IrnIps-7<0•S 15112 v.SC 1(1111)4 113. 1YL x'�x6'x6'=34.41e/-e4) (ussw Wg: 0.9.f66C -N.6)'Scfi,sE' –S0c-c)s- 1'1061)61 :.-71c4 • ( /A) 6ssvirt %v\cie l$° 4ic% -P0041 2; cover ok= g" Cl\ed2 slur O•�Sx2�7(p,"KIS„ Powce 34. lz..Q"‘- (0.(161T—Qs‘ Co Co %,5c ).cHs " ) 0.0n Ail )(1c" at=1.4) 13 4 (/.00 OK. 7 7 Design Sheet MAGNUSSON KLEMENCIC ASSOCIATES Structural + Civil Engineers PROJECT SHEET LOCATION CLIENT DATE BY 42. D•qq) D•G36) [0.44SY0-1S) al(T4?) ictanS Lo.62_s)0. r6A) C206). p‘t kdth_ X k 3.. roiltj `tcc SC) V � iq em 'Tv e Lk -3.31z -K \tX = s •s� �' St1sly 0+0 0. 0- i n'' -- (o•Q )Coal 1' r9W\ch 4.'4 a 4)61: D•oo1gK12x24"=0Sq, (Qa" \-1.e.F.� ecs cvice,Q: C\o't- SQ\ -C41) QA -Q600 -V6 0111Ul'CDCC•1 a ae : ) 2 51.712 2a•a1- / e, ens�otr. (B.A. NA+ Lk' 4 %%\\AQ.� \0 x IDK)\X)AS 0 •Ct-f46hsi x OS 212012 •In ?)ziz wekl: 14 -932. -An �oYC. � g6 10"se (o" " i•Yt201•s . 7 Design Sheet PROJECT SHEET MAG NU S S ON KLEMENCIC' ASSOCIATES ■ Structural + Civil Engineers LOCATION CLIENT DATE BY Qom L- &. c\ c5 1�r3�j�z•i� Iia. k 11 `Pw\aQ. C3. 1 v2.1 •i sskk. coot 36 AsZ Ftk P ssk.*\ . ©• iesS11-1-;•s 'ZS; 0-357e r6)c ?(L4.2.5-‘) = \-4-12- 1SCI. off. *Base. Vie \\q.L?c' :238• )Q•'1C\ Pco‘f4t 11'7" 01\4 .01Y5Dizs\ (6.1C 1 .1g1C J �P Qqk @ C C Q ke�' 2q. a1 ,�, ��Agit st l q4. 'IQ, =-7 PL 1' •arS012-3'(0,(1-ri -fin SOK. Design Sheet MAGNUSSON KLEMENCIC ASSOCIATES ■ Structural + Civil Engineers PROJECT SHEET 8 LOCATION CLIENT DATE BY Wno\a-clow: Cokuk&e IA co, d2sl? wind 3,44: as_icro*,‹ (1°C471)101)1)1 = ID% CID* ICA, W; rut si):;m4:14);,. hl( \occw' RNT =S4'3511-1. %)‹ = 6.gk scn ‘ok dtst .1;C)Q. G*41 61 w '" CaviaJ \ Z cox 6'4'y (/4o Cktv:kv 4((i_ylto* iso) s qg ps� 5)(/),`)41?P ? 6.11k 71\)c. = o•-4-tx2xsoo xq'j lcq" = 6g 712. zoo u = 2•211ZIt i- =a•1321Z•-N- �� —� 0 M11 =0 act 1,93}2.1.1 x . 0.2p4`,tq" = 56.7 lz.4 -�d�C RECEIVED OCT 2 4 2018 TUKWILA PUBLIC WORKS STRUCTURAL CALCULATIONS B-52 Memorial Park - Phase 11 Museum of Flight Tukwila, Washington REVIEWED FOR CODE COMPLIANCE APPROVED DEC 12 2018 City of Tukwila BUILDING DIVISION October 23, 2018 CORRECTION LTR# REVISION N01___ Ard REVISION NO..__ RECEIVED CITY OF TUKWILA OCT 23 2018 PERMIT CENTER ■ MAGNUSSON KLEMENCIC ASSOCIATES 1301 Fifth Avenue, Suite 3200 Seattle, Washington 98101-2699 206 292 1200 F: 206 292 1201 MUSEUM OF FLIGHT 6-59 MEMORIAL PARK PHASE II MAGNUSSON KLEMENCIC ASSOCIATES The Museum of Flight is located in Tukwila, Washington, at 9404 East Marginal Way S. The current project involves the construction of foundations, pedestals and connections supporting a B-52 aircraft as part of a memorial park development. The design of these systems is summarized below. FOUNDATION The primary support of the aircraft is by a 12'9" x 12'9" x 18" thick spread footing under each of the two main landing gear sets. These foundations do not load or span over any subgrade infrastructure or easements. In addition, two small oft x 6ft footings are provided under the wingtip landing gear for additional stability and wingtip hold-down. PEDESTAL To allow the aircraft to be rolled in to place the top of foundation must be flush with the grade surface, and all pedestal components will be installed once the aircraft is in place. To minimize the duration of temporary support all pedestal structure will be fabricated from steel, with non-structural concrete encasement as required per the architect. CONNECTION TO AIRCRAFT The connection of the aircraft to the pedestal will utilize the aircraft's built-in jack mounting points. These mounting points are designed to support the aircraft at a significantly higher loaded weight than the as -installed condition, and will provide secure long-term support. RIJILDING CODES The project is designed in accordance with the following building and material codes: BUILDING CODE Washington State Building Code, with reference to • International Building Code, 2015 Edition (IBC 2015) • State of Washington amendments to IBC 2015 • American Society of Civil Engineers, Minimum Design Loads for Buildings and Other Structures, 2010 Edition (ASCE 7-10) MATERIAL CODES • Reinforced Concrete: American Concrete Institute, Building Code Requirements for Structural Concrete and Commentary, 2011 Edition (ACI 318-1 1). • Structural Steel: American Institute of Steel Construction, Specification for Structural Steel Buildings, 2010 Edition, AISC 360. Basis of Design Museum of Flight B-52 Memorial Park Phase II, Tukwila, Washington MAGNUSSON KLEMENCIC ASSOCIATES LOADING CRITERIA A summary of the project -specific loading criteria follows. This loading meets or exceeds the requirements of the IBC, adapted as necessary for this non -building structure, and incorporates loading requirements specific to this project. RISK CLASSIFICATION The aircraft is not intended to function as a shelter. It will pose a low risk to human life in the event of a failure. Table 1. Risk Category Parameter Value Risk Category GRAVITY LOADING The Museum of Flight has determined the empty weight of the aircraft to be 185,000#. SNOW DESIGN CRITERIA Snow loading is in accordance with the IBC and ASCE 7-10 requirements. Table 2. Snow Design Criteria Parameter Value Ground Snow Load (P9) 20 psf Terrain Category C Exposure Partially Exposed Snow Exposure Factor (Ce) 1 .0 Thermal Factor (C,) 1 .2 Importance Factor (/) 0.8 Flat Roof Snow Load (P) 20 psf The flat roof snow load of 20psf is based on a regional design value of 25psf multiplied by Is, and exceeds the value calculated per ASCE 7-10 section 7.3.4. The full projected area of the aircraft will Basis of Design Museum of Flight B-52 Memorial Park Phase II, Tukwila, Washington MAGNUSSON KLEMENCIC ASSOCIATES conservatively be used for snow load calculation, ignoring potential reduction due to sloped slippery surfaces. WIND DESIGN CRITERIA Wind loading is in accordance with the IBC and ASCE 7-10 requirements. Design will be per Chapter 29 of ASCE 7-10, "Wind Loads on Structures and other Building Appurtenances". Table 3. Wind Design Criteria Parameter Value Basic Wind Speed, 3 -second gust (V) 100 mph Exposure C Design Height h 40 ft Categorization "Solid Freestanding Walls & Solid Freestanding Signs" Reference Figure 29.4-1 SEISMIC DESIGN CRITERIA Seismic loads are in accordance with the IBC and ASCE 7-10 requirements. Design will be per Chapter 15 of ASCE 7-10, "Seismic Design Requirements for Nonbuilding Structures". Site seismic parameters are based on the report for the adjacent Museum of Flight Covered Airpark, by GeoEngineers, Nov 2014. Table 4. Seismic Design Criteria Parameter Value Building Location 47.517°N, 122.297°W Importance Factor (le) 1 .0 Seismic Response Analysis Type Site-specific Spectral Response Coefficients SMS = 1.091, Sos = 0.727 Nonbuilding structure type Inverted Pendulum Type Structures Response Modification Coefficient (R) 2 Basis of Design Museum of Flight B-52 Memorial Park Phase II, Tukwila, Washington MAGNUSSON KLEMENCIC _ ASSOCIATES El Parameter Value Seismic Response Coefficient CS = 0.364 Design Base Shear V= 67.3 kips Analysis Procedure Used Equivalent Lateral Force Analysis MATERIALS The material properties used for the design include the following: Table S. Structural Steel Properties Member Standard, Strength Square or Rectangular Hollow Sections ASTM A500, Grade B, F, = 46 ksi Miscellaneous Plates and Connection Material ASTM A572, F, = 50 ksi High -Strength Bolts 7/8" diameter and smaller 1" diameter and larger ASTM A325 ASTM A490 Table 6. Concrete Properties Member Strength* Slab on Ground, Sidewalks, Curbs, Mechanical Pads f'c=4.0ksi Footings and Piles f'c = 5.0 ksi *28 -day strength, unless noted otherwise. Table 7. Reinforcement Properties Standard Strength ASTM A615, Grade 60 f, =60 ksi Basis of Design Museum of Flight B-52 Memorial Park Phase II, Tukwila, Washington Design Sheet MAGNUSSON KLEMENCIC ASSOCIATES Structural + Civil Engineers PROJECT SHEET LOCATION CLIENT DATE BY'PE) atio,Jokons \N)2.# ; 1SS, 000-J ettpk1) 1-J2n Ah: 1Sa fir\ 1 gS'0" : 4o 0 CArakrAut locd: iroe�r �eor wee l - mix uuJeo; assurnt t ors4- corse 3%. we• ;ickh w Igs aooitno.66 \OIN-CW1 c ,cspec C� i COA \UR S Fr i 12 t, c114 OCA101 1IS WrICASrl M\. ct.Th 1S5 ooKo- : 64-i6o* Show \c,c : 9cR\ec,34 bin oso s 6625 At 2� 66k x Zofs-Q \256p A- 13 /,54X0• =, g364 13274-0-6,6= �6 164 5ecsenic load " nvecteJ P natittly, -6able 1 S • Li- R--72 C5 GP/ P 0 •�2�y,.) - o. IS me .96sa c Split s� i c ' to G7, 30~ "co • - 23 C7 o 4-3 771 Design Sheet MAGNUSSON KLEMENCIC ASSOCIATES Structural + Civil Engineers PROJECT SHEET LOCATION CLIENT DATE BY WIncl 1 cad loornp\\) ex?suc . Cj TreiPA. able qcovna. ?Qr 2CA'Lt 1 56 \-\ zon44 )ptityc.66 arm ..1)SO" $11-r- O . oD WK 4•QAAKd v fL h=0-oo2 Alep-x001(0.35 1002 . ZL G y)54 Cy.- d.05 = 22-& psi x 0 $ >‘1-6)(--3%-C42- 70.1 '1.5)(--3% 270.1 . y koa -4r Cowte 014(4J Skcir 2/ \'i -1 o isAct'% -tp, (104. rzeo0A-- • Mutoc:� of uta Q . 1)&64 e -co coc /ceoc based), Oil Caci CAW s� �jceK �R •+�6 � �01�- 5(1.-T1 �; ,,� = ---q b h o•ilz.� \O•'+R. NOTE : Coa-P J A n'J 6, j AS (1, (-eor gratccasa0,a \oc TAOj Use k\fiSe �o� ll Design Sheet MAGNUSSON KLEMENCIC ASSOCIATES ■ Structural + Civil Engineers PROJECT SHEET LOCATION CLIENT DATE BY UDR p ; C(2-) c)Qc. H 1(-1) \D*1Dti: {)r-.1.201:KUN: \C1-1 -k 1.6-11(4.7b-) e 2.1 =21•akx' 1%e i0Nc100-) , :O •q� fQ;X O. � \ Gil®, n corRN 81 0.c1,16\2S\ X 1.q•22102 -411 ,t e fi) • 1 y1 \ 1 �� 'Tr)," .��1�� at ocousd O€r cap.. y.C1.2..ic1.11.6V--)ol �f12 Combhd c -M CA, x•33 __ o �.� 1.3c12x %So �1•S — 6 c 23o �Z.-;r\ ., OK. Design Sheet MAGNUSSON KLEMENCIC ASSOCIATES Structural + Civil Engineers PROJECT SHEET LOCATION CLIENT DATE BY �� ate: �kslq� A-0 va(ow looked arthare on 4/2_ embed plod Act 1:1 wc* add ora. S`bE4 IS" CAA17 ak.? vP M9: q1"74.. 717.10,.;(\ /.S21,` Pc.cxiv4k �L 23•x' �f L £� . (nn acs - ,c Ioc - L1' 0,na, os (41 004 1- 10a4 (oE' Q 1) ! )wc,. citickAs I c6r. Pcoi'c 1 V' Pg3k Gcadk ?JG • „5- (15-4-211v) (0 • g51,3) \ Je.\ci Ac) embed -Por gy coact o /S -e65 �•� 5o• con�ol S, � 0.4540•bv“ (di 1•51r) 5 57•71'k d 5, D .1}11` use 1( (V (\ r7;,, - S8 5g 5�• TSR ©K. =Palm ifov, Design Sheet MAGNUSSON KLEMENCIC ASSOCIATES r \ Structural + Civil Engineers \ PROJECT SHEET LOCATION CLIENT DATE BY CO Melt Pitz-r6R Max kks4r hey 1 d b k o- c V\ =S'.6" -2��1•ow : P1.2;_t(120.S12-) 1-1 ;1.0 sq• 1�� 29•qk r -� 2q.qk (41,6c) 12.--°i() CAA loot on angor eccRs : (.toctiQ..-1() c k-70, NasKSVI PPRn 5.4.7. 49 AR 01( . SIWC Ca?Cterb : �\Jc. = `)- 0 • '5'` L" 31'r \loop `2. Pntt\ dei CI,. /SC, s -12' < 9-4"; LQ% Aviv\ = 0.75 )'-- = 0.1-24 (,3) \e 41f = 0.0 Sq4 PL Wa5lu 0(4 7-7 57-712_ 04-4.1 i_s-� Joy coot end. Qnc locoU e: 0•&51(0-gxsi2s; _2(Pcbrl Pty 1®• ' 41 _ 3 I -� pfahaz 1-1.•" 1 vAie '. Design Sheet MAGNUSSON KLEMENCIC ASSOCIATES / Structural + Civil Engineers / \ \ i PROJECT LOCATION CLIENT SqKns co rt1 av\ q41446 %\ciklsOD * C c tn� centro.. �J ( wi %SS.)e Cts ►ce = ? c4 Coes. -Qco(\ = 0.4-6 Nssrailt i Tt s t 'Zit -W c S,1 110 .5' Role SoS\ A e4« . V Lo6 irn o.S3 on -V004 ( n: ii9ctP r 21uksTas Cz) 4047 Ig 3h Say. ok�, �4� Sg12 Ecofim (A k. 282.23 k DATE SHEET BY c2i,C40/12-)lx s. s 7<-1 SO) \LO.34t2SS'xtio e) (t2.1cw17.q sl r o• 1 0) (aqs'Y 1. &7. boaciv Clvecsj nek OLac sos1 WeV4 ctwa — -\4(kI) ?<11()?c-Q 0 .n 124 DNA. = I.G4K-0.g.31*; 0.84- IQs - bop cyQ -Qat) Design Sheet MAGNUSSON KLEMENCIC ASSOCIATES ■ Structural + Civil Engineers PROJECT SHEET LOCATION CLIENT DATE BY Snow • S =26j164, O.bS _ 86 t xo•6 _ s • o� 514012_ 02.4sl• = 0 •32 Vs1' Win W=54.4. e Ette +66") W =51.1 C 1Fg4 ) _ 56 •2_ R' -= 0 .6/<5)7-VR4 Vto.s s_ (12.w% 346.4 0•c,1% 34031•• �4S•4 -13 = •CQ 125c• 45c_os;n Cka: eatO.6W CO.84-tD•a°I = \.`&3s -Q Limik = (,4'3)n1•512s- 004 ditch : 0•&,1)-0•GW = a o •aa : o • N)c9 nab. u 9; -Q -V -&, l Design Sheet MAGNUSSON KLEMENCIC ASSOCIATES Structural + Civil Engineers PROJECT SHEET LOCATION CLIENT DATE BY uN 'Tiol� � N' -1H Dr'J a" a" h \B' 4+1S" Cka ?wail sllcc (pcks-ker- bose: Mr" 1-tOct 1c2. -1r) Case A: Loh vQr. 'JQCk in C C Qce b4d =sc.' ? P;Lx \z = 14-1.&12, M O.L- 3401-1:nt<0•4 0•7sP<4-xJo Kss"•cIs" 145 Ccse j. �A-1.612 IVO ,M ;-- 0•4Ykoa kz• r^) (s4jez) 1 \1444 e ; 1.11 it\ 7i\J S. Xc- (1S''0x•18 0(1,-wonshat . 3.46 24.Nt v� = OK. 540c1.9--7‘2125- = S•3D 10-74w,�•� Design Sheet PROJECT LOCATION CLIENT DATE (�Rch -co,,.no\aidn -Ncuce Lizl. ch6 @ ¶5kO&CQC base • 4' C k CcGe A: P" vu dt c€ ; 1\P 2 'J ----7Costs ecpitIsAmik -90(- Ill = moct \Q.-:1(\ 40C111---ir\ 2,67 ■ s SHEET BY A MAGNUSSON KLEMENCIC ASSOCIATES ■ Structural + Civil Engineers Gq" 64" CfiSe Case B; \3Lt") f esis- M4 of M\ M/7 /4' -4 wAA c)\1262= 4,1" wS \z,1(1-4. qt4-1.2i21� co�gy�* 0.1+M3't Design Sheet MAGNUSSON KLEMENCIC ASSOCIATES Structural + Civil Engineers PROJECT SHEET LOCATION CLIENT DATE BY 10 CA\Q.C. rvun "OM¢l steel= imin = "�xI - •F70��'E- CornTofI—�, x0•+4-44 _ • Q64144 C (0\is 14Q -4. Ir2_ .k/J . B. 112 @4rcksitcs42 D4000P t,jerc pi\GS-eC Slab eGz,5Q ClOSQ Design Sheet MAGNUSSON KLEMENCIC ASSOCIATES ■ Structural + Civil Engineers PROJECT SHEET LOCATION CLIENT DATE BY w;hold-down: CaIcuk&2 asSly wind ec%: 000* (w,i1000)1 10c1) C'D* \ocl ga)44/(2_ sygD44,;(1. -1 Con4,1'10 W k--a?ere4 \ocA411: RNA = -�s� 3 �� _ 6 •gk � 3 Pl\z . Sa Octcin. ?01,1.& G, x6' , w a" cOvq, \'Z' 030c 6' .t6(1Y1(0o k\ SO i3 3)0-4 ClAck I- 4(i),:(1104, `SO) s SIg Fs� �vr 61)('),'),c12.? J 6.2( 0)c. = o • tX24 C� ‘):'x14 : B•712 tkk,„ z6.211zx 1•S=c1•1321z•,0- .4 4 Mo -- 0.1 veOl -s i x.7(0 -(2041),c1" = 56.7-1z.4 -�oK ?COv & C,4) 3�c; �I�J CL.1) val) 4 flies dcisla @12" 04. P:\8\8039010\02\CAD\GeoTech\8039010-02 Figure 2 (Site Plan).dwgTAB:Layoutl Date Exported: 02/04/16 - 9:37 by cstickel 1 j I i I I I I I L4= Raisbeck Aviation High School �'I II I I I I Existing fire hydrant: Fxis ing stall converted to accessible van PaiRirig s1alt--- � - Install light pole end bollards -25' east Remove existing light _ pole end bollards B-7 (2009) II L 1 c,r ., . B-1 • B3 (20091* King County stone drain easement rec. no. 9509180955 �- Existing manhole cover Area of monitoring wells, blosundisturbed vents to remain undisturbed — +_ Aviation Pavilion I Picnic table,'typ (0F01) ' - Future 8-52 aircraft • (not in Ph I project) \ \� Future slab foundation (not in Ph I project) i 1;1 ,I I ii I \y,: 1 I 1 141 i .- \\ --IL i4+l I ,F\ I' i I I 1 - I I I I' e I I 1 -1 1 1 1" -1-----1 1 1 1 ..___._.. mo o\ Property liheMP �- - - Limas of wo o N .1 'rstriping/ parking 1 r1'" 1 I \ 6 I 1 V r 1 L-- -1 New one way B-2 (2009) ';New wheelstopsr"'. typ (65) pla6es Install light ppleand� bollerds-25'east , Remove exlsting llgllt (\ poleantibolJards \„ j Demolished striping typ-'r;,\ (29 spacesyotall,: -' Fire lane, typ•'' 1 j off\ 1 ,c\I 4fV 1 --L— e3 0\ y4 '1 I • \,Connection to fire Ipop"' fxistingfire loop Location of new irrigation-' infrastructure: Deduct Meter Backflow Preventer Existing Aviation ,Pavilion generator pad Uncompacted gravel thissiea (-630sf) Legend B 1 Boring, Completed for this Study B-2 (2009) . Boring, Completed for Aviation High school 40 0 40 FEET Notes: 1. The locations of all features shown are approximate. 2. This drawing is for information purposes. It is intended to assist in showing features discussed in an attached document. GeoEngineers, Inc. cannot guarantee the accuracy and content of electronic files. The master file is stored by GeoEngineers, Inc. and will serve as the official record of this communication. Data Source: Base data provided by SRG Partnership, Inc Site Plan Museum of Flight B-52 Foundation Tukwila, Washington GEOENGINEERS Figure 2 L- 1 L J L1 L 1 REVIEWED FOR CODE COMPLIANCE APPROVED DEC 12 2018 City of Tukwila BUILDING DIVISION LI Geotechnical Engineering Services Museum of Flight B-52 Foundation Tukwila, Washington for i+ iut,4-u+„ ut February 5, 2016 MAR 26 2018 s 1 Have we delivered World Class Client Service? Please let us know by visiting www.geoengineers.com/feedback. GEOENGINEER. Biological Pollutants GeoEngineers' Scope of Work specifically excludes the investigation, detection, prevention or assessment of the presence of Biological Pollutants. Accordingly, this report does not include any interpretations, recommendations, findings, or conclusions regarding the detecting, assessing, preventing or abating of Biological Pollutants and no conclusions or inferences should be drawn regarding Biological Pollutants, as they may relate to this project. The term "Biological Pollutants" includes, but is not limited to, molds, fungi, spores, bacteria, and viruses, and/or any of their byproducts. If Client desires these specialized services, they should be obtained from a consultant who offers services in this specialized field. GEOENGINEERSQ February 5, 2016 Page E-4 File No. 8039-010-02 Do Not Redraw the Exploration Logs Geotechnical engineers and geologists prepare final boring and testing logs based upon their interpretation of field logs and laboratory data. To prevent errors or omissions, the logs included in a geotechnical engineering or geologic report should never be redrawn for inclusion in architectural or other design drawings. Only photographic or electronic reproduction is acceptable, but recognize that separating logs from the report can elevate risk. Give Contractors a Complete Report and Guidance Some owners and design professionals believe they can make contractors liable for unanticipated subsurface conditions by limiting what they provide for bid preparation. To help prevent costly problems, give contractors the complete geotechnical engineering or geologic report, but preface it with a clearly written letter of transmittal. In that letter, advise contractors that the report was not prepared for purposes of bid development and that the report's accuracy is limited; encourage them to confer with GeoEngineers and/or to conduct additional study to obtain the specific types of information they need or prefer. A pre-bid conference can also be valuable. Be sure contractors have sufficient time to perform additional study. Only then might an owner be in a position to give contractors the best information available, while requiring them to at least share the financial responsibilities stemming from unanticipated conditions. Further, a contingency for unanticipated conditions should be included in your project budget and schedule. Contractors Are Responsible for Site Safety on Their Own Construction Projects Our geotechnical recommendations are not intended to direct the contractor's procedures, methods, schedule or management of the work site. The contractor is solely responsible for job site safety and for managing construction operations to minimize risks to on-site personnel and to adjacent properties. Read These Provisions Closely Some clients, design professionals and contractors may not recognize that the geoscience practices (geotechnical engineering or geology) are far less exact than other engineering and natural science disciplines. This lack of understanding can create unrealistic expectations that could lead to disappointments, claims and disputes. GeoEngineers includes these explanatory "limitations" provisions in our reports to help reduce such risks. Please confer with GeoEngineers if you are unclear how these "Report Limitations and Guidelines for Use" apply to your project or site. Geotechnical, Geologic and Environmental Reports Should Not Be Interchanged The equipment, techniques and personnel used to perform an environmental study differ significantly from those used to perform a geotechnical or geologic study and vice versa. For that reason, a geotechnical engineering or geologic report does not usually relate any environmental findlings, conclusions or recommendations; e.g., about the likelihood of encountering underground storage tanks or regulated contaminants. Similarly, environmental reports are not used to address geotechnical or geologic concerns regarding a specific project. GEOENGINEERS T'ebruary 5, 2016 Page E-3 File No. 8039-010-02 If important changes are made after the date of this report, GeoEngineers should be given the opportunity to review our interpretations and recommendations and provide written modifications or confirmation, as appropriate. Subsurface Conditions Can Change This geotechnical or geologic report is based on conditions that existed at the time the study was performed. The findings and conclusions of this report may be affected by the passage of time, by manmade events such as construction on or adjacent to the site, or by natural events such as floods, earthquakes, slope instability or groundwater fluctuations. Always contact GeoEngineers before applying a report to determine if it remains applicable. Most Geotechnical and Geologic Findings Are Professional Opinions Our interpretations of subsurface conditions are based on field observations from widely spaced sampling locations at the site. Site exploration identifiessubsurface conditions only at those points where subsurface tests are conducted or samples are taken. GeoEngineers reviewed field and laboratory data and then applied our professional judgment to render an opinion about subsurface conditions throughout the site. Actual subsurface conditions may differ, sometimes significantly, from those indicated in this report. Our report, conclusions and interpretations should not be construed as a warranty of the subsurface conditions. Geotechnical Engineering Report Recommendations Are Not Final Do not over -rely on the preliminary construction recommendations included in this report. These recommendations are not final, because they were developed principally from GeoEngineers' professional judgment and opinion. GeoEngineers' recommendations can be finalized only by observing actual subsurface conditions revealed during construction. GeoEngineers cannot assume responsibility or liability for this report's recommendations if we do not perform construction observation. Sufficient monitoring, testing and consultation by GeoEngineers should be provided during construction to confirm that the conditions encountered are consistent with those indicated by the explorations, to provide recommendations for design changes should the conditions revealed during the work differ from those anticipated, and to evaluate whether or not earthwork activities are completed in accordance with our recommendations. Retaining GeoEngineers for construction observation for this project is the most effective method of managing the risks associated with unanticipated conditions. A Geotechnical Engineering or Geologic Report Could Be Subject to Misinterpretation Misinterpretation of this report by other design team members can result in costly problems. You could lower that risk by having GeoEngineers confer with appropriate members of the design team after submitting the report. Also retain GeoEngineers to review pertinent elements of the design team's plans and specifications. Contractors can also misinterpret a geotechnical engineering or geologic report. Reduce that risk by having GeoEngineers participate in pre-bid and preconstruction conferences, and by providing construction observation. GEOENGINEERSg February 5, 2016 Page E-2 File No. 8039-010-02 APPENDIX E REPORT LIMITATIONS AND GUIDELINES FOR USE1 This appendix provides information to help you manage your risks with respect to the use of this report. Geotechnical Services Are Performed for Specific Purposes, Persons and Projects This report has been prepared for the exclusive use of the Museum of Flight and other project team members for the Museum's B-52 project in Tukwila, Washington. This report may be made available to prospective contractors for their bidding or estimating purposes, but our report, conclusions and interpretations should not be construed as a warranty of the subsurface conditions. This report is not intended for use by others, and the information contained herein is not applicable to other sites. GeoEngineers structures our services to meet the specific needs of our clients. For example, a geotechnical or geologic study conducted for a civil engineer or architect may not fulfill the needs of a construction contractor or even another civil engineer or architect that are involved in the same project. Because each geotechnical or geologic study is unique, each geotechnical engineering or geologic report is unique, prepared solely for the specific client and project site. Our report is prepared for the exclusive use of our Client. No other party may rely on the product of our services unless we agree in advance to such reliance in writing. This is to provide our firm with reasonable protection against open-ended liability claims by third parties with which there would otherwise be no contractual limits to their actions. Within the limitations of scope, schedule and budget, our services have been executed in accordance with our Agreement with the Client and generally accepted geotechnical practices in this area at the time this report was prepared. This report should not be applied for any purpose or project except the one originally contemplated. A Geotechnical Engineering or Geologic Report Is Based on a Unique Set of Project -Specific Factors This report has been prepared for the Museum of Flight B-52 project in Tukwila, Washington. GeoEngineers considered a number of unique, project -specific factors when establishing the scope of services for this project and report. Unless GeoEngineers specifically indicates otherwise, do not rely on this report if it was: • not prepared for you, • not prepared for your project, • not prepared for the specific site explored, or • Completed before important project changes were made. For example, changes that can affect the applicability of this report include those that affect: ■ the function of the proposed structure; ■ elevation, configuration, location, orientation or weight of the proposed structure; ■ composition of the design team; or ■ project ownership. 1 Developed based on material provided by ASFE, Professional Firms Practicing in the Geosciences; www.asfe.org . GEOENGINEERS,..0 February 5, 2016 Page E-1 File No. 8039-010-02 APPENDIX E Report Limitations and Guidelines for Use Start EndLo Total 19 Depth (ft) 99 ed ByBPD Checked By NLT Driller Geologic Drill Drilling Hollow -stem Auger/SPT Method Drilled 7/22/2009 7/22/2009 Hammer Rope and Cathead Data 140 (lbs) / 30 (in) Drop Drilling XL Trailer Rig Equipment A 2 (in) welt was Well was developed Groundwater installed on 7/22/2009 to a depth of (ft). on 7/22/2009. Depth to Water ft Elevation (ft) Surface Elevation (ft) 19.0 Vertical Datum Top of Casing Elevation (ft) Latitude Longitude System Datum N/A Date Measured 8/5/2009 12.1 6.89 Notes: Auger Data: 4' inches ID, 8 inches OD • 1 0 L_ 1)a W h 0 m 0 9 0 0 FIELD DATA O 0 O m E W U Sample Name • MATERIAL DESCRIPTION C• tri U 0 2`U CI CI X18 5- 10- 15 — 18 18 5 3 19 12 2 3 4 AC SM -2 inches asphalt concrete and 11/2 -inch base course Dark brown silty fine sand with chunks of silt (fill) Brownish gray clayey silt with trace sand (soft, wet) SP -SM Dark brown fine sand with silt (medium dens moist) SP Dark gray fine sand with trace silt (medium dense, wet) Note: See Figure A-1 for explanation of symbols. WELL LOG locking J -plug Flush -mount steel monument ,\1�i1 Concrete surface 1.0—%4 seal 6.0 8.0— • y 18.0,•: ! 19.0 Bentonite seal 2 -inch Schedule 40 PVC well casing 10-20 silica colorado sand 2 -inch Schedule 40 PVC screen, 0.02 inch slot width end cap plug Log of Monitoring Well B-7 , G EO E N G I N E E R Project: Project Location: Project Number: Aviation High School Seattle, Washington 2820-003-00 Figure A-8 Sheet 1 of 1 , Start EndL Total Depth (ft) 14 099 ed ByBPD Checked By NLT Driller Geologic Drill Drilling MethoHollow-stem Auger/SPT Drilled 7/21/2009 7/21/2009 Surface Elevation (ft) 19 0 Vertical Datum Hammer Rope and Cathead Data 140 (lbs) / 30 (in) Drop Drilling XL Trailer Rig Equipment Latitude Longitude System N/A Datum Groundwater Depth to Date Measured Water (ftl Elevation (ftl Notes: Auger Data: 3'Y inches ID, 7 inches OD 7/21/2009 6 13.0 1 1 i i i ) i 1 1 1 1 1 1 I s 7 0 's Elevation (feet) o cn o Depth (feet) FIELD DATA Graphic Log Group Classification MATERIAL DESCRIPTION Moisture Content, % Dry Density, (pct) V REMARKS Interval Recovered (in) Blows/foot Collected Sample Sample Name Testing Water Level 11 18 18 111 1 18 7 2 10 1 2 3 a SM Dark reddish brown silty fine sand with chunks of - silt (loose, moist) (fill) 15 SA %F=34 ML— Gray clayey silt with organic matter (soft, wet) — - - - _ — — SP -SM Grayish fine to medium sand with silt and lenses of clayey silt (loose to medium dense, wet) _ _ _ Note: See Figure A-1 for explanation of symbols. I Log of Boring B-4 G EO E N G I N E E R Project: Project Location: Project Number: Aviation High School Seattle, Washington 2820-003-00 Figure A-5 Sheet 1 of 1 , J Start End Total 14 Depth (ft) Logged By BPD Checked By NLT Driller Geologic Drill Drilling Method Hollow -stem Auger/SPT Drilled 7/21/2009 7/21/2009 Surface Elevation (ft) 18.0 Vertical Datum Hammer Rope and Cathead Data 140 (lbs) / 30 (in) Drop Drilling XL Trailer Rig Equipment. Latitude Longitude System N/A Datum Groundwater Depth to Date Measured Water ft Elevation (ftl Notes: Auger Data: 3'/. inches ID, 7 inches OD 7/21/2009 7 11.0 e �p L N W 0 FIELD DATA 2 L E 7 awy O ! C1 MATERIAL DESCRIPTION ac ‘'C 2U . •y 8d C On REMARKSo --e 2 d ..q. cc o y m m EE 03 d m t5 p Vm E, rqF o) C �p s _• _43 18 17 8 11 1 2 3 4 •- • SM Dark brown silty fine to coarse sand with lenses of sandy silt (medium dense, moist) - 10 SA, %F=29 !! ML Grayish black silt with sand and occasional wood — fragments (medium stiff to stiff moist) — - Grades to gray and wet - - — — _5 _^O - 10— _ _ _h _ 18 1184 J18 SP -SM Black fine sand with lenses of silt (medium _ dense, wet) Note: See Figure A-1 for explanation of symbols. • 1 Log of Boring B-3 • G EO E N G I N E E R Project: Project Location: Project Number: Aviation High School Seattle, Washington 2820-003-00 Figure A-4 Sheet 1 of 1 • Start End TotalLogged Depth (ft) 14 By BPD Checked By NLT Driller Geologic Drill Drillin g Method Hollow stem Auger/SPT Drilled 7/21/2009 7/21/2009 Surface Elevation (ft) 18 0 Vertical Datum Hammer Rope and Cathead Data 140 (lbs) / 30 (in) Drop Drilling XL Trailer Rig Equipment Latitude Longitude System N/A Datum Groundwater Elevation (ftl Depth to Date Measured Water ft Notes: Auger Data: 3% inches ID, 7 inches OD • 7/21/2009 11 7.0 i FIELD DATA Z •c Recovered (in) 0 0 co Collected Sample d c re g s Z y U y E, - U ,F —c z a-- E't A m o re H 0 o 3 MATERIAL DESCRIPTION REMARKS h • 5- 1 18 5 10- 1 18 15 1 2 3 • • Dark brown silty fine sand (loose to medium dense, moist) ML Gray silt with trace organic matter (medium stiff, wet) Note: See Figure A-1 for explanation of symbols. SP Black fine to medium sand (medium dense, wet) 10 SA, HA, %F=27 • Log of Boring B-2 G EO E N G 1 N E E R S % Project: Project Location: Project Number. Aviation High School Seattle, Washington 2820-003-00 Figure A-3 Sheet 1 of 1 APPENDIX D PREVIOUS STUDIES GeoEngineers reviewed Togs of previous explorations completed in the general vicinity of the project. The locations of previous explorations are shown on the Site Plan, Figure 2. The logs of some of the previous explorations are presented in this appendix and include: • The logs of four borings (B-2 through B-4, and B-7) completed in 2009 by GeoEngineers in the report entitled "Geotechnical Engineering Services, Aviation High School at the Museum of Flight, Tukwila, Washington." GEOENGINEERSI Februaty 5, 2016 Page D-1 Rle No. 8039-010-02 APPENDIX D Previous Studies AgSource Laboratories A9tN#T;.C..+.TAri4+A0w.aa 040100 Submitted by: UMG24544 GEO ENGINEERS, INC 8410 154TH AVENUE N.E. REDMOND, WA 98052 Date Received 13 -Jan -2016 3i jixtt. ,eet - Umatilla, OR 97882 Te1:541-922-4894 umatilla@agsource.com Submitted for: GEO ENGINEERS Date Reported 18 -Jan -2016 Soil Analysis Laboratory Sample # AU01801 - AU01802 Information Sheet No. S9023 REPORT OF ANALYTICAL RESULTS Field COMPOSITE COMPOSITE COMPOSITE COMPOSITE COMPOSITE COMPOSITE COMPOSITE COMPOSITE Client Sample Identification 1 1 1 1 2 2 2 2 Analysis Clay Sand Silt Texture Texture Silt Sand Clay Result 0.1 % 92.9 % 17.9 % SILT LOAM SILT LOAM 12.0 % 96.9 % 0.1 % DISCLAIMER: Data and information In this report are intended solely for the individual(s) for whom samples were submitted. Reproduction of this report must be in its entirety. Levels listed are guidelines only. Data was reported based on standard laboratory procedures and deviations. Page 1 of 1 Laboratory Sample # Submitted for AU01801 - AU01802 GEO ENGINEERS GEO ENGINEERS, INC 8410 154TH AVENUE N.E. REDMOND, WA 98052 Information Sheet No. M 0 of V) Date Received 13 -Jan -2016 13 -Jan -2016 wW E a 0 U COMPOSITE w0 X Y �t W cl a � a LL a a u a a c E 111 a Z Z3 E 0 Cr w w Z E e vE a1 Q ▪ E •a . • W a> • to a7 C O 0 C a 0 ri O a? 0 n as N 1f> 0 03 0 0 CI d 0 Os O 0 0 0 1. m CI 03 r m d a a1 as J 1 g ' a 0 X 0 0 a m w a9 w ▪ Q Z a 0 0 0 1. • Is T 01 T N o 03 T0 0 7 7 Q Q 4- E O • . a 0 O . r 0 c• 0 ▪ 0 c m'- • rn • • E � ▪ b c m 1 3 It m m a.� E • 0. C t . 2▪ ,41 1a A • ° c c m t m • m d • d a ti v aa) 3 E La m O Q. V V 0 t d C 0 0 at •� E . O r w 0) C C▪ O O › A .1 ▪ 1% W 2 aci o c 0 ._ G , m 'oJ 7 0� • c 0 0, 1 Reviewed/Date Received Relinquished Received Relinquished Received Relinquished Ivy Lab ID Sample Identification Sampled by: CUr, 1 L a ••ktJlTC Project Manager: IBJC/•:4*) Cl TocIAL0 Project Name: Mo_ Project Number: (803°1—IQ—o1 Company: r Analytical Laboratory Testing Services 14648 NE 95th Street • Redmond, WA 98052 Phone: (425) 883-3881 • www.onsite-env.com 0 i1 c 3 - 1,iir? 4 ° Signature 1 o0 0E\ DJ 3 O a t/1 12' 3 4 m0 co 3 x (Check One) ❑ Same Day ❑ 1 Day ❑ 2 Days ❑ 3 Days Standard (7 Days) (TPH analysis 5 Days) (other) ,I Turnaround Request (In working days) CD' a 1 n n '30 .Cis ` 0 Q CD O — -- Number of Containers NWTPH-HCID Laboratory Number: Q 1- Q 3 9 ,� — Ls'NWfPH-Gx 4. c NWITPH-Gx/BTEX NWTPH-Dx 'N. Y N 6 3 Volatiles 8260C Halogenated Volat les 8260C Semivolatiles 8270D/SIM (with low-level PAHs) Chromatograms with final report I Comments/Special Instructions PAHs 8270D/SIM (i,ow-level) PCBs 8082A Organochlorine Pesticides 8081 B Organophosphorus Pesticides 8270D/SIM Chlorinated Acid I-ferbicides 8151A x X Total RCRA Metals Total MTCA Metals TCLP Metals HEM (oil and grease) 1664A jc )c. % Moisture CD 0 9 OnSite Environmental Inc. Data Qualifiers and Abbreviations A - Due to a high sample concentration, the amount spiked is insufficient for meaningful MS/MSD recovery data. B - The analyte indicated was also found in the blank sample. C - The duplicate RPD is outside control limits due to high result variability when analyte concentrations are within five times the quantitation limit. E - The value reported exceeds the quantitation range and is an estimate. F - Surrogate recovery data is not available due to the high concentration of coeluting target compounds. H - The analyte indicated is a common laboratory solvent and may have been introduced during sample preparation, and be impacting the sample result. I - Compound recovery is outside of the control lints. J - The value reported was below the practical quantitation limit. The value is an estimate. K - Sample duplicate RPD is outside control limits due to sample inhomogeneity. The sample was re -extracted and re -analyzed with similar results. L - The RPD is outside of the control limits. M - Hydrocarbons in the gasoline range are impacting the diesel range result. M1 - Hydrocarbons in the gasoline range (toluene-napthalene) are present in the sample. N - Hydrocarbons in the lube oil range are impacting the diesel range result. N1 - Hydrocarbons in diesel range are impacting lube oil range results. 0 - Hydrocarbons indicative of heavier fuels are present in the sample and are impacting the gasoline result. P - The RPD of the detected concentrations between the two columns is greater than 40. Q - Surrogate recovery is outside of the control limits. S - Surrogate recovery data is not available due to the necessary dilution of the sample. T - The sample chromatogram is not similar to a typical U - The analyte was analyzed for, but was not detected above the reported sample quantitation limit. U1 - The practical quantitation limit is elevated due to interferences present in the sample. V - Matrix Spike/Matrix Spike Duplicate recoveries are outside control limits due to matrix effects. W - Matrix Spike/Matrix Spike Duplicate RPD are outside control limits due to matrix effects. X - Sample extract treated with a mercury cleanup procedure. X1- Sample extract treated with a Sulfuric acid/Silica gel cleanup procedure. Y - The calibration verification for this analyte exceeded the 20% drift specified in method 8260C, and therefore the reported result should be considered an estimate. The overall performance of the calibration verification standard met the acceptance criteria of the method. z - ND - Not Detected at PQL PQL - Practical Quantitation Limit RPD - Relative Percent Difference OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. 8 Date of Report: January 13, 2016 Samples Submitted: January 8, 2016 Laboratory Reference: 1601-039 Project: 8039-10-02 % MOISTURE Date Analyzed: 1-11-16 Client ID Lab ID % Moisture Comp - 1 01-039-01 11 Comp - 2 01-039-02 10 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. 7 Date of Report: January 13, 2016 Samples Submitted: January 8, 2016 Laboratory Reference: 1601-039 Project: 8039-10-02 TOTAL METALS EPA 6010C/7471 B MS/MSD QUALITY CONTROL Date Extracted: 1-11&12-16 Date Analyzed: 1-11&12-16 Matrix: Soil Units: mg/kg (ppm) Lab ID: 01-039-01 Spike Percent Percent Analyte Level MS Recovery MSD Recovery RPD Flags Arsenic 100 96.5 97 97.1 97 1 Barium 100 153 110 151 108 1 Cadmium 50.0 52.7 105 53.0 106 1 Chromium 100 134 103 132 101 2 Lead 250 262 105 261 104 0 Mercury 0.500 0.455 91 0.451 90 1 Selenium 100 105 105 106 106 1 Silver 25.0 21.0 84 21.5 86 2 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. 6 Date of Report: January 13, 2016 Samples Submitted: January 8, 2016 Laboratory Reference: 1601-039 Project: 8039-10-02 TOTAL METALS EPA 6010C/7471 B DUPLICATE QUALITY CONTROL Date Extracted: 1-11&12-16 Date Analyzed: 1-11&12-16 Matrix: Soil Units: mg/kg (ppm) Lab ID: 01-039-01 Sample Duplicate Analyte Result Result RPD PQL Flags Arsenic ND ND NA ' 10 Barium 43.0 44.2 3 2.5 Cadmium ND ND NA 0.50 Chromium 31.0 36.6 17 0.50 Lead ND ND NA 5.0 Mercury ND ND NA 0.25 Selenium ND ND NA 10 Silver ND ND NA 1.0 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. 5 Date of Report: January 13, 2016 Samples Submitted: January 8, 2016 Laboratory Reference: 1601-039 Project: 8039-10-02 TOTAL METALS EPA 6010C/7471 B METHOD BLANK QUALITY CONTROL Date Extracted: 1-11&12-16 Date Analyzed: 1-11&12-16 Matrix: Soil Units: mg/kg (ppm) Lab ID: MB0111 SM1 &MB0112S1 Analyte Method Result PQL Arsenic 6010C ND 10 Barium 6010C ND 2.5 Cadmium 6010C ND 0.50 Chromium 6010C ND 0.50 Lead 6010C ND 5.0 Mercury 7471B ND 0.25 Selenium 6010C ND 10 Silver 6010C ND 1.0 OnSite Environmental, Inc. 14648 NE 9e Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. Date of Report: January 13, 2016 Samples Submitted: January 8, 2016 Laboratory Reference: 1601-039 Project: 8039-10-02 TOTAL METALS EPA 6010C/7471 B 4 Matrix: Soil Units: mg/kg (ppm) Date Date Analyte Result PQL EPA Method Prepared Analyzed Flags Lab ID: 01-039-01 Client ID: Comp -1 Arsenic ND 11 6010C 1-11-16 1-11-16 Barium 49 2.8 6010C 1-11-16 1-11-16 Cadmium ND 0.56 6010C 1-11-16 1-11-16 Chromium 35 0.56 6010C 1-11-16 1-11-16 Lead ND 5.6 6010C 1-11-16 1-11-16 Mercury ND 0.28 7471B 1-12-16 1-12-16 Selenium ND 11 6010C 1-11-16 1-11-16 Silver ND 1.1 6010C 1-11-16 1-11-16 Lab ID: Client ID: 01-039-02 Comp -2 Arsenic ND 11 6010C 1-11-16 1-11-16 Barium 43 2.8 6010C 1-11-16 1-11-16 Cadmium ND 0.56 6010C 1-11-16 1-11-16 Chromium 23 0.56 6010C 1-11-16 1-11-16 Lead ND 5.6 6010C 1-11-16 1-11-16 Mercury ND 0.28 7471B 1-12-16 1-12-16 Selenium ND 11 6010C 1-11-16 1-11-16 Silver ND 1.1 6010C 1-11-16 1-11-16 OnSite Environmental, Inc. 14648 NE g5th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. Date of Report: January 13, 2016 Samples Submitted: January 8, 2016 Laboratory Reference: 1601-039 Project: 8039-10-02 Client ID ANALYTICAL REPORT FOR SAMPLES Laboratory ID Matrix Date Sampled Date Received Notes 3 Comp - 1 Comp - 2 01-039-01 01-039-02 Soil 1-8-16 1-8-16 Soil 1-8-16 1-8-16 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individuall or company to whom it is addressed. Date of Report: January 13, 2016 Samples Submitted: January 8, 2016 Laboratory Reference: 1601-039 Project: 8039-10-02 Case Narrative 2 Samples were collected on January 8, 2016 and received by the laboratory on January 8, 2016. They were maintained at the laboratory at a temperature of 2°C to 6°C. Please note that any and all soil sample results are reported on a dry -weight basis, unless otherwise noted below. General QA/QC issues associated with the analytical data enclosed in this laboratory report will be indicated with a reference to a comment or explanation on the Data Qualifier page. More complex and involved QA/QC issues will be discussed in detail below. OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. 06. OnSite Environmental Inc. 14648 NE 95th Street, Redmond, WA 98052 • (425) 883-3881 January 13, 2016 Nancy Tochko GeoEngineers, Inc. 8410 154th Avenue NE Redmond, WA 98052 Re: Analytical Data for Project 8039-10-02 Laboratory Reference No. 1601-039 Dear Nancy: Enclosed are the analytical results and associated quality control data for samples submitted on January 8, 2016. The standard policy of OnSite Environmental, Inc. is to store your samples for 30 days from the date of receipt. If you require longer storage, please contact the laboratory. We appreciate the opportunity to be of service to you on this project. If you have any questions concerning the data, or need additional information, please feel free to call me. Sincerely, David Baumeister Project Manager Enclosures OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. APPENDIX C Reports from OnSite and AgSource Laboratories 8039-010-02 Date Exported: 01/13/16 PERCENT PASSING BY WEIGHT 100 90 80 70 60 50 40 30 20 10 0 U.S. STANDARD SIEVE SIZE 3" 1.5" 3/4" 3/8" #4 #10 #20 #40 #60 #100 #200 1 1 • 1000 100 10 1 GRAIN SIZE IN MILLIMETERS 01 0.01 0.001 COBBLES GRAVEL SAND COARSE FINE COARSE MEDIUM FINE SILT OR CLAY Symbol Boring Number Depth (feet) Moisture (%) Soil Description • B-2 20 26.9 Fine to medium sand (SP) Note: This report may not be reproduced, except in full, without written approval of GeoEngineers, Inc. Test results are applicable only to the specific sample on which they were performed, and should not be interpreted as representative of any other samples obtained at other times, depths or locations, or generated by separate operations or processes. The grain size analysis results were obtained in general accordance with ASTM D 6913. APPENDIX B Laboratory Testing APPENDIX B LABORATORY TESTING Soil samples obtained from the explorations were transported to our laboratory and evaluated to confirm or modify field classifications, as well as to evaluate engineering properties of the soil samples. Representative samples were selected for laboratory testing consisting of moisture content testing, percent fines (material passing the U.S. No. 200 sieve), sieve analyses and Atterberg Limits. The tests were performed in general accordance with test methods of the American Society for Testing and Materials (ASTM) or other applicable procedures. Additional soil chemical analytical testing was completed on some of the soil samples to provide a basis for developing general recommendations for soil handling during construction. The results of this testing is provided in a separate report dated September 25, 2014. Moisture Content and Density Testing Moisture contents and/or density tests were completed in general accordance with ASTM D 2216 and D 2937 for representative samples obtained from the explorations. The results of these tests are presented on the exploration logs in Appendix A at the depths at which the samples were obtained. Percent Passing U.S. No. 200 Sieve (%F) Selected samples were "washed" through the No. 200 mesh sieve to estimate the relative percentages of coarse and fine-grained particles in the soil. The percent passing value represents the percentage by weight of the sample finer than the U.S. No. 200 sieve. These tests were conducted to verify field descriptions and to estimate the fines content for analysis purposes. The tests were conducted in accordance with ASTM D 1140, and the results are shown on the exploration logs at the respective sample depths. Sieve Analyses Full sieve analyses were performed on one selected sample in general accordance with ASTM D-422. The wet sieve analysis method was used to determine the percentage of soil greater than the U.S. No. 200 mesh sieve. The results of the sieve analyses were plotted, classified in general accordance with the USCS, and presented in Figure B-1. Atterberg Limits Atterberg limits tests were used to classify the soils as well as to help determine the consolidation characteristics of the soils. The liquid limit and the plastic limit were determined in general accordance with ASTM D 4318. The results of the Atterberg limits testing indicated that the sample tested was non -plastic. GEOENGINEERS February 5, 2016 Page B-1 Ale No. 8039-010-02 Start End 1/8/2016 Total 41.5 Depth (ft) Logged By CDL Checked By NLT Driller Geologic Drill, Inc. Drilling Hollow -Stem Auer ` Method g Drilled 1/8/2016 Surface Elevation (ft) Vertical Datum Undetermined Hammer Rope & Cathead Data 300 (lbs) / 30 (in) Drop Drilling Mini Track Drill Equipment Easting (X) Northing (Y) System Datum Groundwater Elevation (ft) Depth to Date Measured Water ft Notes: 1 N Elevation (feet) 0 0 0 IV o EA o' u, o Depth (feet) 1 I 1 1 1 I I 1 i 1 1 I 1 1 1 1 I i i i i I i i i i I i i 1 i 1 I i i i I c 1 i i I FIELD DATA Graphic Log Group Classification MATERIAL DESCRIPTION Moisture Content, Dry Density, I (Pe) REMARKS Interval Recovered (in) o sa3 0 m Collected Sample Sample Name Testing Water Level SM/ML Brown to gray silty fine to medium sand with - gravel and sandy silt (medium dense/stiff, - moist) (fill) - 1 12 20 %F = . 13 %F=26 8 2 MC 25 SM — Black silty fine sand (loose, wet) — 5* i — 12 110 'Blow count not representative r3 ML Dark gray silt with organic matter (medium stiff, - moist to wet) - 8 4 SM/ML Black interbedded silty fine sand and sandy silt 31 118 - with trace organic matter (loose/medium stiff, wet) _ SP Black fine to medium sand (loose, wet) 1 12 9 5 1 18 17 8 SA - 27 SA (%F=43) 1 16 14 7 SM Black silty fine sand (medium dense, wet) 118 16 8 — — 1 11 9 ML - Dark gray sandy silt (medium stiff to stiff, wet) - 1 18 9 10 - _ Note: See Figure A-1 for explanation of symbols. Log of Boring B-2 ` GEOENG1NEERS_g Project: Museum of Flight B-52 Foundation Project Location: Tukwila, Washington Project Number: 8039-010-02 Figure A-3 Sheet 1 of 1 , w 0 0 ie w O C7 E O S 2 Z S 8 2 9 £ Start End 1/8/2016 Total Depth (ft) 31'5 Logged B CDL 099 Y Checked By NLT Driller Geologic Drill, Inc. Meting Hollow -Stem Auger Method Drilled 1/8/2016 Surface Elevation (ft) Vertical Datum Undetermined Hammer Rope & Cathead Data 300 (lbs) / 30 (in) Drop Drilling Mini Track Drill Equipment MATERIAL DESCRIPTION Easting (X) Northing (Y) REMARKS System Datum Groundwater Elevation (ft2 Depth to Date Measured Water (ftj Notes: • Gray silty sand with gravel and trace organics 1 Elevation (feet) o Depth (feet) I I 1 1 1 I i III FIELD DATA Graphic Log Group Classification Molsture Content, % Project: Museum of Flight B-52 Foundation Project Location: Tukwila, Washington Project Number: 8039-010-02 V Interval Recovered (in) o n o m Collected Sample Samele Name Testing Water Level MATERIAL DESCRIPTION 2 d 2•Sj 0 .a REMARKS SM Gray silty sand with gravel and trace organics - (loose to medium dense, moist) (fill) - 18 10 %F 11 %F=30 2 34• 2 '� 'Blow count not representative - used SM Gray to brown silty fine to medium sand 1 - (medium dense, wet) (fill?) sampler 10 A 15 6 L ML Gray silt with occasional sand (medium stiff, —AL wet) — 35 AL (non -plastic) 3 38 SPBlack fine to medium sand (loose to medium - _ dense, wet) 15_115 a With occasional thin layers of silt 20 18 8 ,F Trace wood fibers 29 %F=4 - ------ SM Black silty fine sand (medium dense, wet) 25 A 18 21 6 30 A 18 8 Note: See Figure A-1 for explanation of symbols. i Log of Boring B-1 G EO E N G 1 N E E R S Project: Museum of Flight B-52 Foundation Project Location: Tukwila, Washington Project Number: 8039-010-02 Figure A-2 Sheet 1 of 1 SOIL CLASSIFICATION CHART MAJOR DIVISIONS SYMBOLS TYPICAL DESCRIPTIONS GRAPH LETTER COARSE GRAINED SOILS ' MORE THAN 50% RETAINED ON NO. 200 SIEVE GRAVEL AND GRAVELLY SOILS MORE THAN 50% OF COARSE FRACTION RETAINED ON NO. 4 SIEVE CLEAN GRAVELS (LSE OR NO FINES) ova; c o °,„_° �) ) nC GW WELL -GRADED GRAVELS, GRAVEL - SAND MIXTURES 0 0 0 0 0 C 3 0 0 0 GP POORLY -GRADED GRAVELS, GRAVEL -SAND MIXTURES GRAVELS WITH FINES (APPRECWBLE AMOUNT OF FINES) 0 0J m c�, GM SILTY GRAVELS, GRAVEL - SAND - SILT MIXTURES c o/ . GC CLAYEY GRAVELS, GRAVEL - SAND - CLAY MIXTURES SAND AND SANDY SOILS MORE THAN 50% OF COARSE FRACTION PASSING NO. 4 SIEVE CLEAN SANDS (LITTLE OR NO FINES) ........% SW GRAVELLY SDDED S SANDS Sp POORLY -GRADED SANDS, GRAVELLY SAND SANDS WITH FINES OF FINES) (APPRECIABLE AMOUNT SM SILTY SANDS, SAND - SILT MIXTURES //) l SC CLAYEY SANDS, SAND - CLAY MIXTURES FINE GRAINED SOILS MORE THAN 50% PASSING NO. 200 SIEVE SILTS AND CLAYS LESS THAN 50 LIQUID LIMIT ML INORGANIC SILTS, ROCK FLOUR, CLAYEY SILTS WITH SLIGHT PLASTICITY / CL INORGANIC CLAYS OF LOW TO MEDIUM PLASTICITY, GRAVELLY CLAYS, CLAYS, SILTY CLAYS,LEAN CLAYS NO OL ORGANIC SILTS AND ORGANIC SILTY CLAYS OF LOW PLASTICITY SILTS CLAYS LIQUID LIMIT GREATER THAN 50 J J MH INORGANIC SILTS, MICACEOUS OR DIATOMACEOUS SILTY SOILS < j CH INORGANIC CY CLAYS OF HIGH OH ORGANIC CLAYS AND SILTS OF MEDIUM TO HIGH PLASTICITY HIGHLY ORGANIC SOILS PEAT, HUMUS, SWAMP SOILS WITH HIGH ORGANIC CONTENTS == _ _ = FT NOTE: Multiple symbols are used to indicate borderline or dual soil classifications El • 11 Sampler Symbol Descriptions 2.4 -inch I.D. split barrel Standard Penetration Test (SPT) Shelby tube Piston Direct -Push Bulk or grab Continuous Coring Blowcount is recorded for driven samplers as the number of blows required to advance sampler 12 inches (or distance noted). See exploration log for hammer weight and drop. A "P" Indicates sampler pushed using the weight of the drill rig. A "WOH" indicates sampler pushed using the weight of the hammer. ADDITIONAL MATERIAL SYMBOLS SYMBOLS TYPICAL DESCRIPTIONS GRAPH LETTER AC Asphalt Concrete CC Cement Concrete CR Crushed Rock/ Quart' Spalls TS Topsoil/ Forest Duff/Sod Groundwater Contact Measured groundwater level in exploration, well, or piezometer Measured free product in well or piezometer Graphic Log Contact Distinct contact between soil strata Approximate contact between soil strata Material Description Contact Contact between geologic units — — _ _ Contact between soil of the same geologic unit %F %G AL CA CP CS DS HA MC MD OC PM PI PP PPM SA TX UC VS NS SS MS HS NT Laboratory / Field Tests Percent fines Percent gravel Atterberg limits Chemical analysis Laboratory compaction test Consolidation test Direct shear Hydrometer analysis Moisture content Moisture content and dry density Organic content Permeability or hydraulic conductivity Plasticity index Pocket penetrometer Parts per million Sieve analysis Triaxial compression Unconfined compression Vane shear Sheen Classification No Visible Sheen Slight Sheen Moderate Sheen Heavy Sheen Not Tested NOTE: The reader must refer to the discussion in the report text and the Togs of explorations for a proper understanding of subsurface conditions. Descriptions on the logs apply only at the specific exploration locations and at the time the explorations were made; they are not warranted to be representative of subsurface conditions at other locations or times. KEY TO EXPLORATION LOGS • GEOENGINEERS.g FIGURE A-1 Rev. 02/16 APPENDIX A FIELD EXPLORATIONS Subsurface conditions at the site were explored on January 8, 2016 by advancing two borings (B-1 and B-2) at the approximate locations shown on Figure 2. The approximate exploration locations were established in the field by measuring distances from existing site features. The borings were completed to depths ranging from 31.5 to 41.5 feet using mini -track drilling equipment, owned and operated by Geologic Drill of Nine Mile Falls, Washington. The borings were continuously monitored by a geotechnical engineer from our firm who examined and classified the soils encountered, obtained representative soil samples, and observed groundwater conditions. Our representative maintained a detailed Ilog of each boring. Disturbed samples of the representative soil types were obtained using a 2 -inch outside diameter standard penetration test (SPT) split -spoon sampler. One soil sample in each boring were obtained with a California sampler with a 3 -inch outside diameter as a larger sample. The soils encountered in the test borings were typically sampled at 5 -foot vertical intervals with the SPT split -spoon sampler through the full depth of the explorations. SPT sampling was performed using a 2 -inch outside -diameter split -spoon sampler driven with a standard 140 -pound hammer in accordance with ASTM D 1586, with the exception of where the California sampler was used. During the test, a sample is obtained by driving the sampler 18 inches into the soil with a hammer free -falling 30 inches. The number of blows required for each 6 inches of penetration is recorded. The Standard Penetration Resistance ("N -value") of the soil is calculated as the number of blows required for the final 12 inches of penetration (blows/foot). This resistance, or N -value, provides a measure of the relative density of granular soils and the relative consistency of cohesive soils. If the high penetration resistance encountered in the very dense soils precluded driving the total 18 -inch sample interval, the penetration resistance for the partial penetration is entered on logs as follows: if the penetration is greater than 6 inches and less than 18 inches, then the number of blows is recorded over the number of inches driven; 30 blows for 6 inches and 50 blows for 3 inches, for instance, would be recorded as 80/9 -inch. The blow counts are shown on the boring logs at the respective sample depths. The SPT is a useful quantitative tool from which soil density/consistency was evaluated. Soils encountered in the borings were classified in the field in general accordance with ASTM D 2488, the Standard Practice for Classification of Soils, Visual -Manual Procedure, which is summarized in Figure A-1. The boring log symbols are also described in Figure A-1, and logs of the borings are provided as Figures A-2 and A-3. GEOENGINEERS February 5, 2016 Page A-1 Ale No. 8039-010-02 APPENDIX A Field Explorations a H � t s S Austin Stu' .S Holden St a p'. S Portland Sti S Chicago St 5 n 5 Monroe St 5 Elmgrove St S Elmgrove St b S Southern S[ S Southern St D . 5 Rohe St S Rose St cif at \`N t m DOar4, ra z <', e S S Cloverdale St l99[ -PIS Cloverdale St . S Donovan St,.`�' S Donovan St< Na 5 Concord St o_ - \ a S Henderson St 5 Director Sc 3';,. 5 Director S[ a n. >Marra -Dean na rl Park v, a S` 51 o1 v' p1 '3.5 5508` ¢ s' r m � h a 9 C a D < 5112th St 5 112t St < 5 112th St v y CRainier Golf & Country 5 ''o Orar 3 c'( ut ry , a5 115th St N Qo65 v/ Green 1114°. Tran 5-116thStm 5 116th St- N t srb� IIj S 176th St 5116 St �� C S 117th St O.a S 91st St S 93rd St S 95th St 5 96th St 5 99th St 5 99th PI S 100th St S101stSt.GLENDALE s 9 S 102nd Sta 9.es vt a a' Hamlin Robinson u, School Beverly Park Elementary School Q 5 87th PI 0 'ry S Webster 5` 5 Austin 5t 5 Austin St S Holden St c 5 Portland St 5 Chicago 5t '^ SKenyon Et * N Q a0thdlo Park t n 4 1, 7.- 07 • I 5 Kenyon St 5 Kenyon 5 3 73 m S a 13 I Wing Luke Elementary 5 y i Soho I < ut Fk I W 0 R N N Van Emelt Elementary ,. A , ,, School'' y j m M S Thistle St °' N 01 1 j. SSuIIIVah St a ,n‘,m `^SCloverdale St a do $S Cloverda i \\ u S Trenton S til 1.5 Barton St 0 a,* c a, East Duwamish -,C- ''-'1!, w y. 5 Banefrt St Gseeribelt `u o o t a i 3 e -5 % c' Museum of Flight 1 g uon ' m voi 5 96th St s3 S Burns St St 598th`' d 598th 5 Pilgrim St ''2 118-5 d 51 5 Perry St P,: x a. J ,n a SNottp*Sty s S Norfolk St c o .\ ' f n 0, d .`..,. 5 103rd St �::> J/�.. s �. us ! 5104th St ‘4` \i \ O ea ,,. A 21 .v a s c' 5108th Sc3 4 3 G NNt 7 pl�S • A N G P o ' a b V ' 25S wn *Yra' S s y b Wen Ares Golf & Country Club SOUTHERN HEIGHTS 5 107th St ry 3 DUWAMISH Ai19or 5104th P1 Durnmish Nill Pi15tb Sr d E ri 3 .Y P:\8\8039010\GIS\803901002 F1 anti? .Bainbridge Island Errands PoIntlKtitrap lake 1 Anendaie Duvall Seat le Belleyua Bwkn.r "sr0n eeid t.., Hewn Kent/ Notes: 1. The locations of all features shown are approximate. 2. This drawing is for information purposes. It is intended to assist in showing features discussed in an attached document. GeoEngineers, Inc. cannot guarantee the accuracy and content of electronic files. The master file is stored by GeoEngineers, Inc. and will serve as the offidal record of this communication. Data Source: Mapbox Open Street Map, 2015 Projection: NAD 1983 UTM Zone 10N 2,000 2,000 Feet Vicinity Map Museum of Flight IB -52 Foundation Tukwila, Washington GEOENGINEERS Figure 1 REFERENCES GeoEngineers, 2014, "Geotechnical Engineering Services, Museum of Flight Covered Airpark, Tukwila, Washington." GeoEngineers, 2009, "Geotechnical Engineering Services, Aviation High School at the Museum of Flight, Tukwila, Washington." GeoEngineers, 2007, "Phase 1 Environmental Site Assessment, 9229 East Marginal! Way South, Seattle, Washington." GeoEngineers, 2001, "Phase 1 Environmental Site Assessment, 9725 East Margin& Way South, Seattle, Washington." GeoEngineers, 2000, "Phase 1 Environmental Site Assessment, 9725 East Marginal Way South, Seattle, Washington." Idriss, I.M. and Boulanger, R.W. (2008), "Soil Liquefaction During Earthquakes." Earthquake Engineering Research Institute, Monograph MNO-12. Tokimatsu, K. and Seed, H.B. (1987). "Evaluation of Settlement in Sands due to Earthquake Shaking," Journal of Geotechnical Engineering, ASCE, Vol. 113, No. 8, August 1987, pp. 861-878. Troost, K., Booth, D., Wisher, A., and Shimal, A., 2005, "The Geologic Map of Seattle - A Progress Report," U.S. Geological Survey Open -File Report 2005-1252. Washington Administrative Code, Title 296, Part N, "Excavation, Trenching and Shoring." Washington State Department of Transportation, 2016, "Standard Specifications for Road, Bridge and Municipal Construction." Yount, et al., 1993, "Geologic Map of Surficial Deposits in the Seattle 30' x 60' Quadrangle, Washington," U.S. Geological Survey Open -File Report 93-233. GEOENGINEERS February 5, 2016 Page 11 Ale No. 8039-010-02 depending on the construction sequence and time of year. The contractor should be responsible for the design and installation of the temporary dewatering systems required to complete the project. Pipe Bedding Pipeline bedding material should be placed and compacted on the trench subgrade or foundation material until a layer that is a minimum of 6 inches thick or one-fourth of the outside pipe diameter, whichever is greater, is achieved. Where soft or loose soils are encountered below the pipe alignment, we recommend they be removed to a depth of 12 inches below the invert, or to firm material as directed by the engineer. The pipe bedding material should conform to the pipe manufacturer's recommendations, the design engineer's recommendations, the 2014 WSDOT Standard Specification 9-03.12(3), Gravel Backfill for Pipe Zone Bedding or equivalent City standards. Precedence in case of a conflict should be with the design engineer. From a geotechnical standpoint, the native soils will not be suitable for bedding materials. If select import fill is used for the backfill, the trench backfill will be more permeable than the surrounding soils and will fill with water over time. In this case, we recommend that all buried structures such as manholes be designed for uplift assuming that water will pond to within 5 feet of the top of the manholes. Trench Backfill After the pipe has been laid in the trench, the embedment material should be uniformly placed in maximum 8 -inch -thick loose lifts on each side of the pipe, vibrated or otherwise compacted around the pipe haunches (i.e., at and below the pipe spring line) to the top of the zone. We recommend that trench backfill be compacted as recommended in the "Fill Placement and Compaction Criteria" section of this report. A geotechnical engineer should observe the preparation for, placement, and compaction of structural fill. An adequate number of in-place density tests should be performed in the fill to evaluate if the specified degree of compaction is being achieved. At all times during the placement of the pipeline and placement/compaction of the pipeline embedment material, it is the contractor's responsibility to protect the pipeline from damage (e.g., overstressing or impacting the pipeline with heavy equipment, etc.). LIMITATIONS We have prepared this report for the exclusive use of the Museum of Flight and members of the design team for the B-52 Foundation project in Tukwila, Washington. The data and report should be provided to prospective contractors for their bidding or estimating purposes, but our report, conclusions and interpretations should- not be construed as a warranty of the subsurface conditions. Within the limitations of scope, schedule and budget, our services have been executed in accordance with generally accepted practices in the field of geotechnical engineering in this area at the time this report was prepared. No warranty or other conditions, express or implied, should be understood. Any electronic form, facsimile or hard copy of the original document (email, text, table, and/or figure), if provided, and any attachments are only a copy of the original document. The original document is stored by GeoEngineers, Inc. and will serve as the official document of record. Please refer to the appendix titled "Report Limitations and Guidelines for Use" for additional information pertaining to use of this report. GEOENGINEERS February 5, 2016 Page 10 Ale No. 8039-010-02 Until the permanent erosion protection is established and the site is stabilized, site monitoring should be performed by qualified personnel to evaluate the effectiveness of the erosion control measures and to repair and/or modify them as appropriate. Provisions for modifications to the erosion control system based on monitoring observations should be included in the erosion and sedimentation control plan. Utility Considerations Shoring We anticipate that trench excavations required to install utilities and sewers will range from about 3 to 6 feet in depth. All temporary cut slopes and shoring must comply with the provisions of Title 296 WAC, Part N, "Excavation, Trenching and Shoring." The contractor performing the work has the primary responsibility for the protection of workers and adjacent improvements. Temporary shoring will be necessary to support excavations where space limitations restrict the use of open cuts. It may be desirable to excavate partially sloping cuts and use a trench box or other shoring for the lower few feet of the trench. Temporary trench shoring using internal bracing can be designed using active soil pressures. We recommend that temporary shoring be designed using a lateral pressure equal to an equivalent fluid density of 35 pcf for conditions with horizontal backfill adjacent to the excavation. These lateral soil pressures do not include traffic, structure or construction surcharges that should be added separately, if appropriate. Shoring should be designed for a traffic influence equal to a uniform lateral pressure of 100 psf acting over the depth of the trench. More conservative pressure values should be used if the designer deems them appropriate. These soil pressure recommendations are predicated upon the construction being essentially dewatered; therefore, hydrostatic water pressures are not included. If portions of the shoring use passive elements such as anchor or reaction blocks, available soil resistance can be estimated using passive soil pressures assuming an equivalent fluid density of 275 pcf above the water table and 130 pcf below the water table. The above -recommended lateral soil pressures do not include the effects of hydrostatic pressures or surcharges behind the wall. The effects of surcharge loads behind the shoring should be considered in design. If effective dewatering methods are used to lower the groundwater level below the bottom of the excavation, hydrostatic pressures need not be added to the soil pressures within the exposed height of shoring. Dewatering The groundwater across the project area is partially influenced by tidal fluctuations of the Duwamish River. In general, based on our observations during construction of the Space Gallery and the Aviation High School, we anticipate that the groundwater is typically 7 to 10 feet below existing grade. However, the groundwater levels could be higher during extreme high tides or during extended periods of heavy precipitation. Because the soils at the project consist mostly of sand with variable amounts of silt, we recommend that the groundwater table be maintained at least 2 feet below the planned bottom of the excavations during construction. Otherwise, excessive groundwater flow into excavations could cause lateral movement of the granular soils into the excavations, possibly destabilizing the excavations or causing excessive ground settlement adjacent to the excavations. We anticipate that the temporary dewatering system could likely consist of sumps, but other dewatering measures might be necessary GEOENGINEERS February 5, 2016 Page 9 Ale No. 8039-010-02 • Structural fill placed in pavement or sidewalk areas, including utility trench backfill, should be compacted to 90 percent of the MDD estimated in general accordance with ASTM D 1557, except that the upper 2 feet of fill below final subgrade should be compacted to 95 percent of the MDD. • Structural fill placed as crushed rock base course below pavements should be compacted to 95 percent of the MDD estimated in general accordance with ASTM D 1557. • Nonstructural fill, such as fill placed in landscape areas, should be compacted to at least 85 percent of the MDD estimated in general accordance with ASTM D 1557. In areas intended for future development, a higher degree of compaction should be considered to reduce the settlement potential of the fill soils. We recommend that a representative from our firm be present during placement of structural fill. Our representative will evaluate the adequacy of the subgrade soils and identify areas needing further work, perform in-place moisture -density tests in the fill to evaluate if the work is being done in accordance with the compaction specifications, and advise on any modifications to procedure that may be appropriate for the prevailing conditions. Erosion and Sedimentation Control Potential sources or causes of erosion and sedimentation depend upon construction methods, slope length and gradient, amount of soil exposed and/or disturbed, soil type, construction sequencing and weather. Implementing an erosion and sedimentation control plan will reduce the project impact on erosion -prone areas. The plan should be designed in accordance with applicable city, county and/or state standards. The plan should incorporate basic planning principles, including: • Scheduling grading and construction to reduce soil exposure; • Retaining existing asphalt whenever feasible; • Revegetating or mulching denuded areas, • Directing runoff away from denuded areas; • Reducing the length and steepness of slopes with exposed soils; • Decreasing runoff velocities; • Preparing drainage ways and outlets to handle concentrated or increased runoff; • Confining sediment to the project site; and • Inspecting and maintaining control measures frequently. In addition, we recommend that sloped surfaces in exposed or disturbed soil be restored so that surface runoff does not become channeled. Some sloughing and raveling of slopes with exposed or disturbed soil should be expected. Temporary erosion protection should be used and maintained in areas with exposed or disturbed soils to help reduce erosion and reduce transport of sediment to adjacent areas and receiving waters. Permanent erosion protection should be provided by paving or landscape planting. GEOENGINEERS_O February 5, 2016 Page 8 Ale No. 8039-010-02 Structural Fill We understand the Museum desires to limit the amount of soil exported from the site. The on-site soils in the upper 5 feet typically consist of fine to medium sand with a high percentage of silt. Thus, the on-site sand may be considered for use as structural fill only for placement during periods of dry weather. This will likely not be practicable unless site work is completed during the normally dry summer months (July through September. Even if reused in landscape areas, the fill will be difficult to place and compact during wet weather. The following sections of this report present options for structural fill placement that will be dictated by the weather conditions. On-site Solis The surficial on-site near -surface soils are anticipated to consist of mainly silty fine to medium sand with gravel with some areas of sandy silt. In general, most of the on-site sand is anticipated to contain sufficient fines as to be moisture -sensitive and thus will be difficult to reuse as structural fill unless protected from rain during storage and placed and compacted during extended periods of dry weather. The silt should only be reused in landscape areas. Wet Weather Conditions If construction is planned for the wet winter months, we recommend that imported structural fill be included for construction of the foundation pads. Materials Materials used to support foundations, structures, roadways and parking areas are classified as structural fill for the purpose of this report. Structural fill material quality varies depending upon its use, as described below: ■ Structural fill to support the plane foundations should meet the criteria for common borrow as described in Section 9-03.14(3) of the 2014 Washington State Department of Transportation (WSDOT) Standard Specifications. Common borrow will be suitable for use as structural till during dry weather conditions only. If structural fill is placed during wet weather, the structural fill should consist of gravel borrow as described in Section 9-03.14(1) of the WSDOT Standard Specifications, with the additional restriction that the fines content by limited to no more than 5 percent. Alternatively, the structural fill can consist of recycled concrete or crushed rock base course in conformance with Section 9-03.9(3) of the WSDOT Standard Specifications. or Structural fill placed as crushed surfacing base course below sidewalks and pavements should meet the requirements of crushed rock base course in conformance with Section 9-03.9(3) of the WSDOT Standard Specifications. Fill Placement and Compaction Criteria Structural fill should be mechanically compacted to a firm, non -yielding condition. Structural fill should be placed in loose lifts not exceeding 8 to 10 inches in thickness. Each lift should be conditioned to the proper moisture content and compacted to the specified density before placing subsequent lifts. Structural fill should be compacted to the following criteria: • Structural fill placed below foundations should be compacted to 95 percent of the MDD estimated in general accordance with ASTM D 1557. GEOENGINEERS February 5, 2016 Page 7 File No. 8039-010-02 Temporary Cut Slopes All temporary cut slopes and shoring must comply with the provisions of Title 296 Washington Administrative Code (WAC), Part N, "Excavation, Trenching and Shoring." The contractor performing the work has the primary responsibility for protection of workers and adjacent improvements. We recommend temporary cut slope inclinations of 11/2H:1V (horizontal to vertical) in the existing fill and alluvial deposits encountered at the site. Some caving/sloughing of the cut slopes may occur at this inclination. The inclination may need to be flattened by the contractor if significant caving/sloughing occurs. These cut slope recommendations apply to fully dewatered conditions. For open cuts at the site, we recommend that: • No traffic, construction equipment, stockpiles or building supplies be allowed at the top of the cut slopes within a distance of at least 5 feet from the top of the cut. • Exposed soil along the slope be protected from surface erosion using waterproof tarps or plastic sheeting. • Construction activities be scheduled so that the length of time the temporary cut is left open is reduced to the extent practicable. • Erosion control measures be implemented as appropriate such that runoff from the site is reduced to the extent practicable. • Surface water be diverted away from the excavation. is The general condition of the slopes be observed periodically by GeoEngineers to confirm adequate stability. Because the contractor has control of the construction operations, the contractor should be made responsible for the stability of cut slopes, as well as the safety of the excavations. The contractor should take all necessary steps to ensure the safety of the workers near slopes. Subgrade Preparation The on-site soils below the existing pavement contain a significant amount of fines (silt) and are moisture - sensitive. Operation of equipment on these exposed soils will be difficult under wet conditions. Disturbance of shallow subgrade soils should be expected if subgrade preparation work is done during periods of wet weather. We anticipate that either existing sand fill or native silt and sand will be exposed across the excavation. If sand or granular fill is exposed, we recommend recompacting the exposed footing subgrade to a dense and unyielding condition. If silt is exposed, as discussed above we recommend that a woven geotextile be placed across the subgrade after all loose soil removed. We anticipate that the depth of the excavation required for the foundation will generally be above the water table. Perched groundwater may be encountered if work takes place during or immediately after extended wet weather. We anticipate that the perched water can be handled during construction by sump pumping, as necessary. All collected water should be routed to suitable discharge points. GEOENGINEERY; February 5, 2016 Page 6 file No. 8039-010-02 separation layer between the silt soil and the structural fill. The zone of structural fill should extend laterally beyond the footing edges a horizontal distance at least equal to the thickness of the fill where possible. All loose or disturbed soil must be removed prior to placing the structural fill pad. An allowable soil bearing value of 1,500 pounds per square foot (psf) may be used for support of the plane foundations supported on a zone of structural fill as described above. The allowable soil bearing value applies to the total of dead and longterm live loads and may be increased by up to one-third for wind or seismic loads. For this recommended bearing pressure, we anticipate that the footings will likely be about 7 to 10 feet in width and length to support the plane loads. We estimate that a new isolated footing subjected to a long-term dead load of 1,500 psf for a footing 10 feet square could experience between ih and 1.5 inches of settlement. As discussed above, we understand that the owner recognizes that this type of foundation is susceptible to additional settlement if an earthquake induces liquefaction in the underlying soils. Lateral Resistance Lateral loads can be resisted by passive resistance on the sides of the footings and by friction on the base of the footings. Passive resistance should be evaluated using an equivalent fluid density of 350 pcf where footings are surrounded by structural fill compacted to at least 95 percent of MDD, as recommended. The structural fill should extend out at least a distance equal to two and one-half times the depth of the foundation element from its face. A passive pressure of 250 pcf should be used if the footing is poured directly against existing fill or native soils. These values also assume the ground surface in front of the footing will be level for a horizontal distance equal to at least two times the depth of the footing. If soils adjacent to footings are disturbed during construction, the disturbed soils must be recompacted, otherwise the lateral passive resistance value must be reduced. Resistance to passive pressure should be calculated from the bottom of adjacent paving or below a depth of 1 foot where the adjacent area is unpaved, as appropriate. Frictional resistance can be evaluated using 0.45 for the coefficient of base friction against footings which are underlain by structural fill. The above values incorporate a factor of safety of about 1.5. Earthwork and Structural Fill Excavation Considerations The near -surface soils encountered in the explorations typically consist of sand with variable amounts of silt, and silt. We anticipate that these soils can be excavated with conventional excavation equipment such as backhoes, trackhoes and dozers. We anticipate that most excavations required for the project will be relatively shallow, on the order of 2 to 4 feet in depth. At this time, we do not anticipate the need for shoring other than possibly the use of trench boxes or trench shields for utility trenches, which is discussed in the "Utility Considerations" section of this report. We anticipate that the depth of the excavations required for the foundations will generally be above the anticipated water level. Perched groundwater may be encountered above this depth if work takes place during or immediately after extended wet weather. We anticipate that the perched water can be handled during construction by sump pumping, as necessary. All collected water should be routed to suitable discharge points. GEOENGINEERS� February 5, 2016 Page 5 File Na. 8039-010-02 sand and gravel deposits which contain some shell fragments, suggesting that they were deposited in an estuarine environment. Groundwater Conditions Groundwater was generally encountered during drilling at depths ranging from 7 to 9 feet below the ground surface. Based on observations during construction of the high school and the Covered Airpark, we anticipate that the groundwater is typically at a depth of 9 to 12 feet except during extreme high tide events or prolonged periods of precipitation. Groundwater conditions should be expected to fluctuate as a function of season, precipitation, and tidal fluctuations of the Duwamish River and other factors. CONCLUSIONS AND RECOMMENDATIONS Based on the results of our subsurface explorations and our geotechnical engineering evaluations, it is our opinion that the foundation for the B-52 bomber can be supported on shallow spread foundations as currently planned. We estimate that the foundations might experience 1 to 2 inches of settlement, but understand that the display can tolerate this amount of settlement. We understand that the Museum and project team are aware that the site is underlain by thick granular deposits which are susceptible to liquefaction during a large earthquake. Therefore, if a large earthquake event occurred, additional settlement or lateral spreading into Slip 6 could impact the foundations; we understand that the Museum is willing to accept this risk. The foundations will be close to the existing King County Storm drain. However, as the invert of the storm drain is 12 to 13 feet below existing grade, in our opinion the loads from the plane will have minimal impacts on the storm drain. The upper fill soils contain sufficient fines that they will become soft and easily disturbed if wet. To minimize disturbance of the near -surface soils and allow for amending these soils for landscaping purposes, we recommend that the earthwork and grading be accomplished during the dryer months of the year. It will be difficult to reuse excavated on-site soil during wet weather. We previously prepared a soil handling plan for the Museum's use during construction for the Covered Airpark. For this project, we have recommended to the Museum and project team members that it should be a goal to keep soil on the property. Although this portion of the Museum's property has been remediated, the soil likely still contains chemicals that, although not a regulatory condition, would need to be tested and handled appropriately if taken off site. B-52 Foundation Support We recommend that the shallow foundations used to support the B-52 bomber be founded on a zone of properly compacted structural fill to provide more uniform support near the base of the foundation. We recommend that the foundations be founded) on a layer of structural fill or crushed rock with a minimum thickness of 18 inches. The structural fill/crushed rock should be compacted to at least 95 percent of the maximum dry density (MDD) in general accordance with ASTM International (ASTM) D 1557. If sand is exposed at the base of the excavation, we recommend the exposed surface be recompacted. If silt is exposed along the base of the excavation, we recommend that a woven geotextile fabric such as Mirafi 500X be placed between the exposed soil and the new structural fill. The fabric will aid as a GEOENGINEERS February 5, 2016 Page 4 File No. 8039-010-02 action is ongoing under the direction of the Environmental Protection Agency (EPA) and is being conducted by the prior property owner, Container Properties. This remedial effort is unrelated to, and will not affect, the Museum's proposed B-52 display plans. GeoEngineers' Phase I ESA also concluded that "soil at the site may contain residual concentrations of hazardous substances (less than MICA cleanup levels) that may require special handling and disposal procedures during site redevelopment." As a part of past clean-up activities by Container Properties, most of the project area was previously excavated to a depth of about 3 feet to remove contaminated soils. These areas were backfilled with clean fill material, but the report does not comment on the degree of compaction applied to the fill soils placed to restore grades. Site Geology Published geologic information for the project vicinity includes a United States Geological Survey Map titled "Geologic Map of Surficial Deposits in the Seattle 30' x 60' Quadrangle, Washington" (Yount et al., 1993) and "The Geologic Map of Seattle - A Progress Report" (Troost et al., 2005). The surficial soils in the vicinity of the site are mapped as alluvial deposits and modified land. The alluvial deposits generally consist of interbedded layers of soil ranging from clay to sand and gravel. These soils were deposited across the valley by the meandering of the Duwamish River, are as much as 250 feet thick and are poorly consolidated. The modified land in this area is typically dredged fill placed to develop Boeing Field and adjacent industrial areas. Surface Conditions The site is relatively level and consists of exposed soil across much of the site and some crushed gravel across other portions of the site. The north and east portions of the site are adjacent to parking areas used for the high school. A 747 and a 737 are currently being stored on the east portion of the site. A fence is present along the south and west boundaries of the site. A large 27 -inch -diameter King County storm sewer is present diagonally across the site. Based on existing information, it appears that the invert for this storm drain is about 12 to 13 feet below existing grade. Subsurface Conditions Soil Conditions Based on the borings completed near the proposed foundation pads for the B-52, the soils within 30 feet of the surface consist mainly of surficial fill overlying mainly granular alluvial deposits. The fill consists of loose to medium dense silty sand with some gravel to stiff sandy silt and appears to be about 4 to 5 feet in thick. The fill is underlain by granular alluvial deposits consisting of loose to medium dense sand to silty sand with occasional interbedded layers of silt and sandy silt. A thin (2- to 3 -foot -thick) layer of medium stiff silt was encountered within the sand deposits. This upper layer of silt was thicker (5 to 7 feet) in the borings completed for the high school. A clean sand deposit was encountered at a depth ranging from about 11 to 14 feet. At a depth of about 24 feet, the alluvium transitions back to interbedded silty sand and sandy silt deposits. Based on our explorations completed for Aviation High School and the Covered Airpark, we anticipate that below a depth of about 30 to 40 feet, the silt layers are thicker and more numerous. At a depth of about 60 to 65 feet, the upper interbedded granular and fine-grained alluvial deposits are underlain by deposits of soft silt and clay with varying amounts of silt and organic matter (lacustrine fine- grained soils). The soft lacustrine fine-grained soil deposits are underlain by medium dense to very dense GEOENGINEERSI February 5, 2016 Page 3 File No. 8039-010-02 Additional Soil Characteristics The landscape architect for the project requested that the surficial soils at the site be tested for total metals and certain minerals and other plant nutrient characteristics. Composite soil samples were obtained by obtaining a soil sample from the upper 12 inches at three locations across the east and west half of the site. The samples from the three locations were mixed to develop two composite samples, one for the east half and the other for the west half. Composite 1 represents the west portion of the site and Composite 2 the eastern portion. OnSite Environmental tested the composite samples for total metals. AgSource Laboratories in Umatilla, Oregon tested the samples for nutrients and texture. The results of the soil tests are presented in Appendix C. PREVIOUS STUDIES GeoEngineers reviewed the logs of explorations completed as part of previous studies in the vicinity of the project site, including those completed by GeoEngineers for the design of the Covered Airpark and the Aviation High School. The location of the borings completed for the Aviation High School project closest to the project site are also shown in Figure 2. The boring logs from the borings shown on the Site Plan are presented in Appendix D. SITE CONDITIONS Setting and Site History The project site is located in the Duwamish Valley west of the Aviation High School and the Covered Airpark (currently under construction) in Tukwila, Washington, as shown in Figure 1. The project site is relatively flat. The south side of the project site is situated about 60 feet from Slip 6 which extends to the east off of the Duwamish River. The proposed plane foundation will be about 120 to 140 feet north and northeast of the slip. The site was originally developed in the 1930s for industrial purposes. The site was originally part of a larger parcel consisting of west and east parcels. The west parcel, abutting the Duwamish River, is where a large chemical processing plant operated. The east portion of the property (the portion of the historical site, now owned by the Museum) was used primarily for offices and lesser industrial facilities. The west and east parcels have been subject to numerous environmental assessments and cleanup actions. GeoEngineers previously completed a Phase I ESA on behalf of the Museum, the results of which are presented in our report for the Museum dated February 28, 2007. The Phase I Environmental Site Assessment (ESA) was completed as part of the Museum's due diligence prior to purchasing the east parcel from Container Properties, the previous property owner. At the time of the Phase I ESA, GeoEngineers concluded that the cleanup action had been successfully completed at the subject property and that no known or suspect environmental conditions were identified for the property with the exception of residual toluene in groundwater (and soil at the base of a remedial excavation) in the southwest portion of the property. These previous environmental cleanup actions consisted of remedial excavation of toluene and metals -contaminated soil across portions of the western half of the property. Additionally, an air sparging/vapor extraction system (AS/VE) is still operating in the southwest corner of the property to remediate toluene -contaminated groundwater remaining in this area of the property. This environmental GEOENGINEERS_O February 5, 2016 Page 2 File No. 8039-010-02 INTRODUCTION AND PROJECT DESCRIPTION This report presents the results of GeoEngineers' subsurface explorations and geotechnical engineering design services for the Museum of Flight's proposed B-52 project in Tukwila, Washington. The project site is shown relative to surrounding physical features on the Vicinity Map (Figure 1) and the Site Plan (Figure 2). We understand that the Museum of Flight (Museum) is currently planning to permanently display a B-52 bomber west of the covered airpark currently under construction. The site for the B-52 will be immediately south of the Aviation High School parking lot and north of Slip 6. The wheel loads for the plane are approximately 125 kips in the back and 60 kips in the front. At this time, the project will entail constructing a foundation to support the B-52 bomber and landscaping around the display. At a later date, other landscape features might be added. Our understanding of the project is based on information provided by Nathan Messmer with SRG Architects and discussions with various team members. The purposes of this study were to review existing geotechnical information and to complete additional subsurface explorations at the project site as a basis for providing geotechnical engineering conclusions and recommendations for the design and construction of the B-52 foundation. Our services were completed in general accordance with our proposal dated December 1, 2015. Our specific scope of services for the geotechnical engineering services included: • Reviewing previous explorations completed at the site and on adjacent properties; • Completing additional borings to characterize the subsurface conditions at the site; • Performing analyses to evaluate various foundation support options; • Completing soil nutrient analyses; and • Preparing this geotechnical engineering report. FIELD EXPLORATIONS AND LABORATORY TESTING Field Explorations The subsurface conditions at the site were evaluated by completing two borings (B-1 and B-2) to depths of 31.5 and 41.5 feet. The approximate locations of these explorations are shown in Figure 2. A detailed description of the field exploration program and the logs of the borings are presented in Appendix A. Laboratory Testing Soil samples were obtained during the drilling and taken to GeoEngineers' laboratory for further evaluation. Selected samples were tested for the determination of moisture content, percent fines, gradation characteristics and Atterberg limits (plasticity characteristics). The tests were performed in general accordance with test methods of the American Society for Testing and Materials (ASTM). A description of the laboratory testing and the test results are presented in Appendix B. GEOENGINEERS_O February 5, 2016 Page 1 File No. 8039-010-02 Table of Contents INTRODUCTION AND PROJECT DESCRIPTION 1 FIELD EXPLORATIONS AND LABORATORY TESTING 1 Field Explorations 1 Laboratory Testing 1 Additional Soil Characteristics 2 PREVIOUS STUDIES 2 SITE CONDITIONS 2 Setting and Site History 2 Site Geology 3 Surface Conditions 3 Subsurface Conditions 3 Soil Conditions 3 Groundwater Conditions 4 CONCLUSIONS AND RECOMMENDATIONS 4 B-52 Foundation Support 4 Lateral Resistance 5 Earthwork and Structural Fill 5 Excavation Considerations 5 Temporary Cut Slopes 6 Subgrade Preparation 6 Structural Fill 7 Erosion and Sedimentation Control 8 Utility Considerations 9 Shoring 9 Dewatering 9 Pipe Bedding 10 Trench Backfill 10 LIMITATIONS 10 REFERENCES 11 LIST OF FIGURES Figure 1. Vicinity Map Figure 2. Site Plan APPENDICES Appendix A. Field Explorations Figure A-1 - Key to Exploration Logs Figures A-2 through A-3 - Log of Borings Appendix B. Laboratory Testing Figure B-1- Sieve Analysis Results Appendix C. Reports from OnSite and AgSource Laboratories Appendix D. Previous Studies Appendix E. Report Limitations and Guidelines for Use GEOENGINEERSQ February 5, 2016 Page i File No. 8039-010-02 _. 1 Geotechnical Engineering Services Museum of Flight B-52 Foundation Tukwila, Washington File No. 8039-010-02 February 5, 2016 Prepared for: Museum of Flight 9404 East Marginal Way Seattle, Washington 98108 Attention: Laurie Haag Prepared by: GeoEngineers, Inc. 8410 154th Avenue NE Redmond, Washington 98052 425.861.6000 Nancy L. Tochko, PE Senior Geotechnical Engineer Matthew W. Smith, PE Principal NLT:MWS:nld Disclaimer: Any electronic form, facsimile or hard copy of the original document (email, text, table, and/or figure), if provided, and any attachments are onlya copy of the original document. The original document is stored byGeoEngineers, Inc. and will serve as the official document of record. Copyright© 2016 byGeoEngineers, Inc. All rights reserved. GEOENGINEERS...a0.. Geotechnical Engineering Services Museum of Flight B-52 Foundation Tukwila, Washington for Museum of Flight February 5, 2016 GEOENGINEER j 8410 154th Avenue NE Redmond, Washington 98052 425.861.6000 c BULLETIN B2 STANDARD CONSTRUCTION PLAN NOTES City of Tukwila Public Works Department 206-433-0179 Locations shown for existing utilities are approximate. Prior to starting construction, Contact ONE -CALL (811 or 1-800-424-5555) for utility locations. CONTACTS 1. Project Manager Provide Name and Contact Number 2. Design Engineer Provide Name and Contact Number 3. Owner: Provide Name and Contact Number 4. Other: Provide Name and Contact Number GEOTECHNICAL NOTE I, Sorr.N - 4.11/4vw ofc.crw s , the-architect/structural------ _--- engineer, reviewed the geotechnical report, titled M n F g.s� go„, AT, 0.4 , prepared by [�worl3(,tuc Ly and dated 2/57 ((o . I understand the report's recommendations, I explained to the Owner the risks due to slides and I incorporated the recommendations into the design. I established measures to reduce potential risk of injury or damage that might be caused by any earth movement predicted in the report. Signature �'J `-�J`�--- Date 0 3/40--ot The ftrifYE REVIec �c��ess 0' t. `LIANCE APPROVED DEC 12 2018 City of Tukwila BUILDING DIVISION Approved 05.16.02 Revised 02.21.03 Revised 06.09.04 ould be modified to fit the project, before they are included on the plans. RECEIVED CITY OF TUKWILA MAR 26 2018 PERMIT CENTER 4 BULLETIN B2 STANDARD CONSTRUCTION NOTES GENERAL 1. At least one week before beginning construction, contact Public Works Utilities Inspector and schedule a preconstruction meeting. 2. Notify the Utilities Inspector at 206-433-0179 at least 48 hours (2 working days) before starting project site work. 3. Request a Public Works utility inspection at least 24 hours (1 working day) in advance by calling 206-433-0179. 4. The Contractor assumes sole responsibility for worker safety, and damage to structures and improvements resulting from construction operations. 5. The Contractor shall have the permit(s) and conditions, the approved plans, and a current copy of City of Tukwila Development Guidelines and Design and Construction Standards available at the job site. 6. All work shall conform to these approved drawings. Any changes from the approved plans require pre -approval from the owner, the engineer, and the City of Tukwila. 7. All methods and materials shall meet City of Tukwila Development Guidelines and Design and Construction Standards, unless otherwise approved by the Public Works Director. 8. Contractor shall maintain a current set of record drawings on-site. 9. Contractor shall provide record drawings prior to project final approval. 10. Contractor shall provide traffic control and street maintenance plan for Public Works approval before implementation. 11. All surveying for public facilities shall be done under the direction of a Washington licensed land surveyor. Vertical datum shall be NAVD 1988. For projects within a flood control zone, the Permittee shall provide conversion calculations to NGVD 1929. Horizontal datum shall be State Plane Coordinates. 12. The Contractor shall replace, or relocate all signs damaged or removed due to construction. GRADING AND EROSION CONTROL NOTES 1. The erosion prevention and sediment control (ESC) measures on the approved plans are minimum requirements. 2. Before beginning any construction activities, establish the clearing limits and install construction entrance. 3. Before any ground disturbance occurs, all downstream erosion prevention and sediment control measures (ESC) must be constructed and in operation. Install and maintain all ESC measures according to the ESC plan. 4. ESC measures, including all perimeter controls, shall remain in place until final site construction is completed and permanent stabilization is established. 5. From May 1 through September 30, provide temporary and permanent cover measures to protect disturbed areas that will remain unworked for seven days or more. Approved 05.16.02 Revised 02.21.03 Revised 06.09.04 2 r BULLETIN B2 STANDARD CONSTRUCTION NOTES 6. From October 1 through April 30, provide temporary and permanent cover measures to protect disturbed areas that will remain unworked for two days or more. In addition to cover measures, the Contractor shall: • Protect stockpiles and steep cut and fill slopes if unworked for more than 12 hours. • Stockpile, on site, enough cover materials to cover all disturbed areas. 7. By October 8, seed all areas that will remain unworked during the wet season (October 1 through April 30). Mulch all seeded areas. UTILITY NOTES 1. All trench excavation operations shall meet or exceed all applicable shoring laws for trenches. All trench safety systems shall meet WISHA requirements. 2. Place power, cable, fiber optics, and telephone lines s in a trench with a 5' minimum horizontal separation from other underground utilities. 3. Adjust all manholes, catch basins, and valves in public rights-of-way or easements after asphalt paving. WORK IN RIGHT-OF-WAY 1. When activity is unattended, install a sign with minimum two-inch letters stating Permittee or company name, and day and evening phone numbers. TMC 11.08.140 2. Install barricades, signs, warning lights, and safety devices sufficient to notify public of obstruction or traffic hazard. Devices must remain until the obstruction is cleared and the right-of-way is restored. TMC 11.08.170.A 3. Maintain access to fire stations, fire hydrants, fire escapes, and firefighting equipment. TMC 11.08.180 4. Maintain access to property adjoining excavation or site work. 5. Preserve and protect all property adjoining excavation or site work. 6. Restore disturbance to private and public property. TMC 11.08.220.D 7. Disturbance of survey monuments and markers requires the Director's preapproval. A licensed surveyor shall replace disturbed monuments and markers. 8. Comply with all state and city laws and procedures to protect public from air, water and noise pollution. TMC 11.08.210 9. Install temporary sidewalk or curb ramp if permanent is blocked. TMC 11.08.220 10. Cover open excavation with non-skid steel plates ramped to elevation of contiguous right of way surface. TMC 11.08.220 11. Store all stockpile material shall be stored in a safe manner to protect the public. Approved 05.16.02 Revised 02.21.03 Revised 06.09.04 3 BULLETIN B2 STANDARD CONSTRUCTION NOTES PAVEMENT RESTORATION 1. Compact backfill to compaction of undisturbed ground or compact backfill to meet City standards. 2. Restore pavement to its original condition immediately following backfilling or when concrete is cured. a. Except for winter or other weather conditions which prevent paving, complete paving, resurfacing, or facility replacement: • On principal arterial, major or collector street within 3 calendar days. • On other streets within 7 calendar days b. For work prevented due to weather: • Provide a temporary patch. • Provide a construction schedule addressing means and methods to minimize traffic disruption and to complete work as quickly as possible. STORM DRAINAGE NOTES 1. All methods and materials shall meet City of Tukwila Development Guidelines and Design and Construction Standards, and the current King County Surface Water Design Manual, unless otherwise approved. 2. Mark all storm drain inlets with "Dump No Waste" and either "Drains to Streams", "Drains to Wetlands", or "Drains to Groundwater", as applicable. 3. Driveway culverts shall be of sufficient length to provide a minimum 3:1 slope from the edge of the driveway to the bottom of the ditch. Culverts shall have beveled end sections that match the side slope. 4. Single family residences constructed on lots created by subdivision must provide downspout infiltration shown on the approved plans. 5. Coordinate final stub -out locations with the Utilities Inspector. Provide a wire or other detection device and mark stub -out location with a 5 -foot 2"x4" stake, buried 4 -feet and labeled "storm' or "drain". SANITARY SEWER NOTES 1 All methods and materials shall meet City of Tukwila Development Guidelines and Design and Construction Standards, unless otherwise approved. 2. The Contractor shall mark the end of the side sewer, inside the property line, with a 4 foot pressure treated 2 x 4, buried in the ground 4 feet. The buried end shall have a 2 x 4 cleat nailed to it to prevent withdrawal of the stake. The exposed 1 -foot shall be painted traffic yellow and the depth to the side sewer or tee shall be indicated in black paint. 3. Install sanitary sewer lines at least 10 feet horizontally, measured edge to edge, from any existing or proposed water supply and at least 18 inches below the bottom of a water line. Approved 05.16.02 Revised 02.21.03 Revised 06.09.04 4 BULLETIN B2 STANDARD CONSTRUCTION NOTES WATER SUPPLY NOTES 1 The Contractor shall install corporate stops, water service lines, and meters. The City of Tukwila will install the meters. 2. Pressure test all water mains and appurtenances. 3. Flush and disinfect new, cleaned, or repaired water mains. 4. Install restrained joints at all bends, tees, and other direction changes. 5. All water mains shall have a blow -off assembly at low point and an air vacuum relief valve at high point of main. 6. Install fire hydrant assembly so it stands plumb and so that the lowest outlet is at 18" above the finished grade. The assembly shall have a clear zone around hydrant of at least 36" and the pumper port shall face street or fire access. 7. The installer of a fire line backflow prevention device installed outside the building and underground, shall have a Level III certificate of competency or a Level U contractor's certificate of competency. If the installer is different from the backflow prevention designer, the installer must stamp, sign, and date the plans, in addition to the designer's stamp, signature, and date. 8. Install water mains crossing sewer lines so that the bottom of the water main is at least 18 inches above the top of the sewer. Locate full section of water pipe so that its midpoint is above the sewer pipe at the crossing. This installation may require special structural support for the water and sewer pipe. 9. Install water supply lines at least 10 feet horizontally, measured edge to edge, from any existing or proposed sewer and at least 18 inches above the top of a sewer. Approved 05.16.02 Revised 02.21.03 Revised 06.09.04 5 1 Greenforest Incorporated p; 173 E, TO: Clark Miller, Director of Facilities The Museum of Flight 9404 East Marginal Way South Seattle, WA 98108 REFERENCE: Significant Tree Inventory and Report SITE ADDRESS: 9404 East Marginal Way South DATE: March 12, 2018 PREPARED BY: RECEIVED CITY OF TUKWILA MAR 2 7 2018 PERMIT CENTER Favero Greenforest, ISA Certified Arborist # PN -0143A ISA Tree Risk Assessment Qualified ASCA Registered Consulting Arborist® #379 The Museum of Flight will build a Commemorative Park for the B-52 Stratofortress. The selected site has an existing row of regulated trees1 that stand along the south border. I visited the site last week and inspected the trees, which are the subject of this report. Summary: the subject trees include 11 Lombardi poplar, and two native bitter cherries. Removal is proposed for all 13 trees and will require 58 replacement tree SUBJECT TREES VIEWED FROM THE NORTH 1 TMC §18.06.775 Significant Tree. A "significant tree" means a tree (Cottonwo inches or more in diameter as measured 4.5 feet above grade. DEC 12 2018 excluded) which is 4 City of Tukwila BUILDING DIVISION 4547 South Lucile Street, Seattle, WA 98118 Tel. 206-723-0656 Clark Miller, The Museum of Flight RE: Significant Tree Inventory and Report, 9404 East Marginal Way S March 12, 2018 Page 2 of 7 TREE EVALUATION —Tree Health, Condition and Viability I marked each tree with 1" x 3.5" aluminum tag indicating tree number. I visually inspected each tree from the ground and rated both tree health and structure. A tree's structure is distinct from its health. This inspection identifies what is visible with both. Structure is the way the tree is put together or constructed, and identifying obvious defects can be helpful in determining if a tree is predisposed to failure. Tree health assesses disease, insect infestation and old age. No invasive procedures were performed on any trees. The results of this inspection are based on what was visible at the time of the inspection. The attached inventory contains the following information and attributes for each regualted tree. Tree number as shown on tag in the field, and in the attached inventory. DBH stem diameter in inches measured 4.5 feet from the ground. Tree Species common name. Tree Height in feet. Dripline radius in feet as the distance to the furthest extent to the tree's branches. Structure and Health rating '1' indicates good to excellent condition: no visible health-related problems or structural defects, '2' indicates fair condition; minor visible problems or defects that may require attention if the tree is retained, and '3' indicates poor condition; significant visible problems or defects and tree removal is recommended. Comments on Condition obvious structural defects, tree form, or diseases visible at time of inspection. Viability a determination by the arborist whether the tree is viable for retention. REPLACEMENT TREES Replacement tree requirements are found in TMC §18.54.130, and required replacement tree quantities are calculated based on the size of the removed regulated tree. Greenforest Registered Consulting Arborist Clark Miller, The Museum of Flight RE: Significant Tree Inventory and Report, 9404 East Marginal Way S March 12, 2018 Page3of7 The quantity of replacement trees required based on the removal of all the subject trees is 58. (See attachment.) Minimum sizes for replacement trees shall be 2.5 -inch caliper for deciduous trees, 6 to 8 feet in height for evergreen trees. Replacement plants shall meet current American Association of Nurserymen standards for nursery stock. Planting and maintenance of required replacement vegetation shall be in accordance with best management practices for landscaping which ensure the vegetation's long-term health and survival. LIMITATIONS AND USE OF THIS REPORT This tree report establishes, via the most practical means available, the existing conditions of the trees on the subject property. Ratings for health and structure, as well as any recommendations are valid only through the development and construction process. This report is based solely on what is readily visible and observable, without any invasive means. There are several conditions that can affect a tree's condition that may be pre-existing and unable to be ascertained with a visual -only analysis. No attempt was made to determine the presence of hidden or concealed conditions which may contribute to the risk or failure potential of trees on the site. These conditions include root and stem (trunk) rot, internal cracks, structural defects or construction damage to roots, which may be hidden beneath the soil. Additionally, construction and post -construction circumstances can cause a relatively rapid deterioration of a tree's condition. Attachments: 1. Assumptions & Limiting Conditions 2. Certification of Performance 3. Tree Inventory 4. Site Exhibit Greenforest Registered Consulting Arborist Clark Miller, The Museum of Flight RE: Significant Tree Inventory and Report, 9404 East Marginal Way S March 12, 2018 Page 4 of 7 Attachment No. 1- Assumptions & Limiting Conditions 1) A field examination of the site was made 3/9/2018. My observations and conclusions are as of that date. 2) Care has been taken to obtain all information from reliable sources. All data has been verified insofar as possible; however, the consultant/arborist can neither guarantee nor be responsible for the accuracy of information provided by others. 3) Unless stated other wise: 1) information contained in this report covers only those trees that were examined and reflects the condition of those trees at the time of inspection; and 2) the inspection is limited to visual examination of the subject trees without dissection, excavation, probing, or coring. There is no warranty or guarantee, expressed or implied that problems or deficiencies of the subject tree may not arise in the future. 4) All trees possess the risk of failure. Trees can fail at any time, with or without obvious defects, and with or without applied stress. A complete evaluation of the potential for this (a) tree to fail requires excavation and examination of the base of the subject tree. 5) The consultant/appraiser shall not be required to give testimony or to attend court by reason of this report unless subsequent contractual arrangements are made. 6) Loss or alteration of any part of this report invalidates the entire report. 7) Unless required by law otherwise, possession of this report or a copy thereof does not imply right of publication or use for any purpose by any other than the person to whom it is addressed, without the prior expressed written or verbal consent of the consultant/appraiser. 8) The consultant does not assume any liability for the subject tree and does not represent the transfer of such for any risks associated with the tree from the landowner to the consultant. Risk management is solely the responsibility of the landowner. Greenforest Registered Consulting Arborist Clark Miller, The Museum of Flight RE: Significant Tree Inventory and Report, 9404 East Marginal Way S March 12, 2018 Page 5 of 7 Attachment No. 2 - Certification of Performance I, Favero Greenforest, certify that: • I have personally inspected the trees and the property referred to in this report and have stated my findings accurately. • I have no current or prospective interest in the vegetation or the property that is the subject of this report and have no personal interest or bias with respect to the parties involved. • The analysis, opinion, and conclusions stated herein are my own and are based on current scientific procedures and facts. • My analysis, opinion, and conclusions were developed and this report has been prepared according to commonly accepted arboricultural practices. • No one provided significant professional assistance to me, except as indicated within the report. • My compensation is not contingent upon the reporting of a predetermined conclusion that favors the cause of the client of any other party nor upon the results of the assessment, the attainment of stipulated results, or the occurrence of any subsequent events. I further certify that I am a member in good standing of International Society of Arboriculture (ISA), and the ISA PNW Chapter, I am an ISA Certified Arborist (#PN - 0143A) and am Tree Risk Assessment Qualified, and am a Registered Consulting Arborist® (#379) with American Society of Consulting Arborists. I have worked as an independent consulting arborist since 1989. Signed: GREENFORES'f, Inc. By Favero Greenforest, M. S. Digitally signed by Favero Greenforest Favero Greenforest DN: cn=Favero Greenforest, o,ou, email=greenforestinc@mindspring.com, c=US Date: 2018.03.12 09:18:09 -07'00' Date: March 12, 2018 Greenforest Registered Consulting Arborist P Clark Miller, The Museum of Flight RE: Significant Tree Inventory and Report, 9404 East Marginal Way S March 12, 2018 Page 6 of 7 Attachment No. 3 —Tree Invento Tree No. DBH Tree Species Tree Height Health Structure Comments on Condition Viable Tree Replacement Trees2 1 16" Lombardi poplar 65' 8' 1 1 Yes 4 2 21" Lombardi poplar 80' 11' 1 2 Previously topped at 35' Yes 6 3 26" Lombardi poplar 85' 12' 1 2 Yes 8 4 19" Lombardi poplar 85' 12' 1 2 Yes 6 5 15" Lombardi poplar 85' 10' 2 2 Yes 4 6 10" Lombardi poplar 70' 10' 1 2 Trunk canker Yes 2 7 13" Lombardi poplar 70' 11' 1 2 Double leader Yes 4 8 19" Lombardi poplar 85' 12' 1 2 Yes 6 9 19" Lombardi poplar 85' 12' 1 1 Yes 6 10 7" Bitter cherry 25' 10' 3 3 Dieback, diseased, decline, stumpsprout NO 1 11 8" Bitter cherry 25' 10' 3 3 NO 1 12 17" Lombardi poplar 85' 10' 1 1 Yes 4 13 21" Lombardi poplar 85' 11' 1 1 Yes 6 58 Clark Miller, The Museum of Flight RE: Significant Tree Inventory and Report, 9404 East Marginal Way S March 12, 2018 Page 7 of 7 Attachment No. 4 — Site Exhibit (Trees #1-#13, aerial view) Raisbeck Aviation -High•School Greenforest Registered Consulting Arborist • SRG SRG PARTNERSHIP, INC all SW COLUMBIA STREET POET ANU OREGON 91701 SOI 222 1911 11D UNION STREET SUITE 300 oEAT'LE. WASHINGTON 9910:. 7069731/00 S RG PA R T HE R S H 'P.GOM March 26, 2018 Department of Community Development and the Department of Public Works Permit Center City of Tukwila 6300 Southcenter Boulevard Tukwila, Washington 98188 Subject: Museum of Flight B-52 Memorial Park, Phase 2 Dear DCD and DPW, We're pleased to submit our Construction Permit and Public Works Permit applications for the second phase of development for the Museum of Flight's B-52 Memorial Park. As was described in Phase 1 documentation, the Park will display a restored B -52G Stratofortress in a park -like setting with educational exhibits and signage dedicated to aircraft that served in Vietnam. It will also honor veterans with a small flag plaza and a statue depicting a returning aviator. The disassembly of the aircraft at Paine Field in Everett has begun, and we are anxious to get all required permits in place to ready the site for its arrival in Tukwila. The Museum is working with Sellen Construction to mobilize as quickly as possible. Part of the current activity is revisiting exterior lighting strategy to maximize value and reduce cost. Because that is in progress, lighting fixture types have not yet been specified; we spoke to your plan reviewer regarding the Washington State Non - Residential Energy Code Compliance form for exterior lighting, and it was agreed that we will submit that form when the fixtures and Tamping have been selected and the electrical and lighting plan are submitted. Note as well that there is no new water or sewer service in this phase. Documents submitted include: Completed Construction Permit Application Public Works Fee Estimate Worksheet A2 Contractor's (Sellen) Cost Estimate of Work Plan Review Fee, Public Works Plan Review Fee Affidavit of Ownership and Hold Harmless Permission Two (2) Sets Structural Calculations Two Geotechnical Reports Five (5) Technical Information Reports Five (5) Plan Sets btSoOSS to Enter Property RECEIVED CITY OF TUKWILA MAR 26 2018 PERMIT CENTER We appreciate the City's continuing support of the Museum's vision- to be the foremost educational air and space museum in the world. Our partnership with the City of Tukwila is essential in making that happen. Sincerely, Stan Jaworowski, AIA Architect Page 2 of 2 r STORMWATER TECHNICAL INFORMATION REPORT B-52 Memorial Park Phase 2 Tukwila, Washington RECEIVED CITY OF TUKWILA MAR 26 2018 PERMIT CENTER March 26, 2018 REVIEWED FOR CODE COMPLIANCE APPROVED DEC 12 2018 BUILDING Tukwila DIVISION tA • 00 f)C3 ■ MAGNUSSON KLEMENCIC ASSOCIATES 1301 Fifth Avenue, Suite 3200 Seattle, Washington 98101-2699 Ti 206 292 1200 F: 206 292 1201 MAGNUSSON KLEMENCIC ASSOCIATES ■ SECTION 1: PROJECT OVERVIEW SECTION 2• CONDITIONS AND RFQUIREMENTS SUMMARY SECTION 4: FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN SECTION 5: CONVEYANCE SYSTEM AND ANALYSIS DESIGN SECTION 6• SPECIAL REPORTS AND STUDIES SECTION 7: OTHER PERMITS SECTION 8: CONSTRUCTION STORMWATER POLLUTION PREVENTION PLAN ANALYSIS AND DESIGN SECTION 9: BOND QUANTITIES WORKSHEET, RETENTION/DETENTION FACILITY SUMMARY SEIEET AND DECLARATION OF COVENANT SECTION 10: OPERATIONS AND MAINTENANCE MANUAL Stormwater Technical Information Report B-52 Memorial Park Phase 1, Tukwila, Washington 1 2 4 4 4 4 4 5 8 8 Table of Contents SECTION 1 • PROJECT OVERVIEW INTRODUCTION MAGNUSSON KLEMENCIC AssOCIATES N This report documents the stormwater and drainage design approach and proposal for the Museum of Flight (MOF) B-52 Memorial Park Phase 2 Project (Park). The report has been prepared using the 2009 King County Surface Water Design Manual (KCSWDM) as a general guideline for this abbreviated Stormwater Technical Information Report (TIR). In some cases the information requested in the KCSWDM is specific to permitting in King County. Requested information that is directly related to work in King County has been omitted from this TIR. The project is located in the City of Tukwila directly southwest of Raisbeck Aviation High School (9229 East Marginal Way South), north of S 94th Place, in the southwestern -most portion of Parcel Number 572980-0010. See Figure 1-1 for a vicinity map showing the location of the site. The project site is currently owned by the Museum of Flight and was formerly owned by Container Properties. Work on the site will be completed in two phases. Phase 1 of the Park project, completed in Summer 2016, included the reconfiguration of the existing adjacent parking, the removal of asphalt pavement, the development of lawn areas, installation of an irrigation system, a new water service for irrigation, and the installation of a pervious gravel area for picnic tables. No significant grading was done for Phase 1. There have been no further site improvements since the completion of Phase 1. The scope of work for Phase 2 will create a landscaped area of natural vegetation, plantings, gravel pathways, and a raised concrete plaza mound with a commemorative statue and flagpoles. All of these improvements are part of an exhibit for restored B-52 aircraft. The project will also include foundations to support the aircraft, irrigation and lighting and removal of trees. The Phase 1 and 2 work were approved as a Planned Action in March 2016. Because this is a phased development, the land cover prior to the start of the Phase 1 improvements is considered the predeveloped condition for the purposes of this TIR. EXISTING DRAINAGE Prior to the commencement of Phase 1, the site was entirely impervious consisting of asphalt or concrete paving and compacted soil and gravel surfacing. Aerial images dating as far back as 1990 show that this site has been impervious since at least that time. A portion of the site currently drains to an existing on-site conveyance on the on the Raisbeck Aviation High School property which discharges to the Duwamish River through an existing 36 -inch outfall, owned by King County, at the northeast corner of Slip 6. This conveyance system was installed during the construction of Raisbeck Aviation High School. This conveyance system connects to an existing storm drain system that includes the King County outfall on the high school site. This system includes a water quality treatment device (StormFilter), installed by the high school project, that treats the pollution - generating impervious surfaces created by that project. The King County outfall also collects discharge from adjacent properties on the west side of East Marginal Way South as well as a portion of the runoff from the King County International Airport. Stormwater Technical Information Report B-52 Memorial Park Phase 2, Tukwila, Washington MAGNUSSON KLEMENCIC ASSOC.A(FS The reminder of the site has no collection or conveyance system and discharges as overland flow to the adjacent Container Properties site. The site drainage area, site characteristics, and the existing storm drain conveyance system are shown in Figure 1-2. PROPOSED DRAINAGE The Phase 1 drainage did not modify the existing drainage system and the catchment areas draining to the existing conveyance systems were maintained. No new conveyance systems were installed. Phase 2 will maintain all existing drainage systems and there are no proposed improvements. Overall peak flow rates will be reduced as a result of the reduction in impervious surfaces. SFCTION ?• CONDITIONS AND RFOUIREMFNTS SUMMARY SITE CONDITIONS • The site disturbance within the Phase 2 limits of work is 0.83 acres as shown on Figure 2-1. Areas of Phase 2 were previously disturbed for the Phase 1 work. • The existing pervious and impervious areas, prior to Phase 1, within the Phase 2 limits of work, are 0.06 acres and 0.88 acres respectively. See Figure 2-2. • The proposed pervious and impervious areas, after the completion of the Phase2 work, within the Phase 2 limits of work are 0.66 acres and 0.27 acres respectively. See Figure 2-3. This represents an increase to the pervious area, and corresponding decrease to the impervious area, of 0.61 acres. • Prior to the Phase 1 work, the existing pollution -generating impervious surface area within the site disturbance area was 2,571 square feet. All pollution -generating impervious surface areas within the site disturbance area were removed as part of the Phase 1 work. There are not proposed pollution -generating surfaces proposed for Phase 2. CORE REQUIREMENTS Evaluation of the project with respect to the Core and Special Requirements is outlined below. Core Requirement 1: Discharge at the Natural Location The drainage from the site disturbance area will continue to drain to the existing off-site systems on the Container Properties site and Raisbeck Aviation High School, which eventually discharge to outfalls at the Duwamish River. Core Requirement 2: Off -Site Analysis Not applicable. The proposed development reduces the impervious surface and as a result there is no adverse change to the rate, volume, duration, or location of discharges to and from the site. Stormwater Technical Information Report B-52 Memorial Park Phase 2, Tukwila, Washington MAGNUSSON KLEMENCIC Assoc CAT S Core Requirement 3: Flow Control Not applicable. The project is within the Duwamish River Basin and discharges via a closed conveyance system, with adequate capacity, to a point below River Mile 6, and is therefore exempt from the flow control requirement. Core Requirement 4: Conveyance System There are no new conveyance systems required for this project. Existing on-site conveyance lines have not been analyzed since there is a decrease to the to the peak flow rate as a result of the decrease in impervious area within the site disturbance area. Core Requirement 5: Temporary Erosion and Sedimentation Control A Temporary Erosion and Sedimentation Control (TESC) plan has been prepared for the project. Core Requirement 6: Maintenance and Operation There is an existing water quality treatment facility on the Raisbeck Aviation High School site. Maintenance and operation of this facility is by the high school. Core Requirement 7: Financial Guarantees and Liability Not applicable. This is a requirement specifically related to work in unincorporated King County. Core Requirement 8: Water Quality There will be no new or replaced pollution -generating impervious surface. Additional water quality treatment beyond what currently exists on the high school site is not required. Pollution -generating impervious surface areas were reduced as a result of the removal of asphalt paved parking areas in Phase 1. There no new pollution -generating surfaces proposed for Phase 2. SPECIAL REQUIREMENTS Special Requirement 1: Other Adopted Area -Specific Requirements Not applicable. Special Requirement 2: Flood Hazard Area Delineation Not applicable. The project site appears on the National Flood Insurance Rate Map, dated May 16, 1995, Community Panel No. 53033C0645F, and is situated in Zone "X," an area determined to be outside the 500 -year floodplain. Special Requirement 3: Flood Protection Facilities Not applicable. There are no flood protection facilities on the project site. Stormwater Technical Information Report B-52 Memorial Park Phase 2, Tukwila, Washington Special Requirement 4: Source Controls Not applicable. There will be no storage of pollutant material outdoors. Special Requirement 5: Oil Control Not applicable. The project is not a high -use site. SECTION 3- OFF-SITE ANALYSIS Not applicable. MAGNUSSON KLEMENCIC ASSOC ATES Y SECTION 4. FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN Flow control analysis and design is not applicable. At the completion of Phase 2 the project will reduce the impervious surface within the site disturbance area. Water quality facility analysis and design is not applicable. During Phase 1, the project reduced the pollution -generating impervious surface within the site disturbance area. There are no new pollution - generating impervious surface proposed for Phase 2. SECTION 5• CONVEYANCE SYSTEM ANAI YSIS AND DESIIGN Not applicable. There are no changes proposed to the existing conveyance systems. SECTION A• SPECIAL REPORTS AND STUDIES Not applicable. SECTION 7• OTHER PERMITS The following permits apply to this project: • Shoreline Substantial Development Permit • Building Permit • Tree Permit Stormwater Technical Information Report B-52 Memorial Park Phase 2, Tukwila, Washington SECTION 8: CONSTRUCTION STORMWATER POLLUTION PREVENTION PLAN ANALYSIS AND DESIGN TESC REQUIREMENTS MAGNUSSON KLEMENCIC ASSOC AUS A TESC Plan has been prepared for the project and is included in this report as Figure 8-1. The plan will meet the minimum TESC requirements as discussed below. TESC Requirement 1: Clearing Limits Tree clearing and protection are identified on the landscape drawings. There is no planned pavement removal. TESC Requirement 2: Cover Measures Cover measures will be addressed in the TESC Plan Notes. TESC Requirement 3: Perimeter Protection A compost filter sock has been indicated at the grading/demolition limits. TESC Requirement 4: Traffic Area Stabilization Stabilization will be provided by the existing pavement. The TESC Plan Notes will indicate that State water quality standards are applicable to construction site runoff. TESC Requirement 5: Sediment Retention Sediment retention in the form of catch basin inserts has been indicated. TESC Requirement 6: Surface Water Control Compost filter socks have been shown on the plans. TESC Requirement 7: Dust Control Air quality will be addressed in the TESC Plan Notes. TESC Requirement 8: Wet -Season Construction Wet -season construction will be addressed in the TESC Plan Notes. TESC Requirement 9: Construction within Sensitive Areas and Buffers Not applicable. Stormwater Technical Information Report B-52 Memorial Park Phase 2, Tukwila, Washington MAGNUSSON KLEMENCIC ASSOC Alt d TESC Requirement 10: Maintenance Maintenance will be addressed in the TESC Plan Notes. TESC Requirement 11: Final Stabilization Final stabilization will be in accordance with the final paving and landscape plans for the project. STORMWATER POLLUTION PREVENTION AND SPILL PLAN DURING CONSTRUCTION Best management practices (BMPs) to prevent pollution from construction activities, in addition to the TESC requirements, shall be implemented during construction. These BMPs are based on the activity sheets in the 2009 King County Stormwater Pollution Prevention Manual. Activity Sheet A-4 – Storage of Soil, Sand, and Other Erodible Materials • Cover and contain the stockpiles of raw materials to prevent stormwater from washing material to surface waters or a storm drainage system. The covers must be in place at all times when the stockpile is not in active use. Do not hose down the contained stockpile area to the storm drainage system. • Stockpiles located away from paved areas or where material will not be washed or tracked to the storm drainage system may not need to be covered unless windy conditions cause airborne particulate that could settle on hard surfaces and subsequently be washed into adjacent surface waters or storm drainage systems. • If the stockpiles are so large that they cannot feasibly be covered and contained, implement erosion control practices at the perimeter and as needed on site to prevent erosion and runoff of the stockpiled material into the storm drainage system or off site. See the King County Surface Water Design Manual, Appendix D (Erosion and Sediment Control Standards). • Required routine maintenance: — Sweep paved storage areas as needed and collect and dispose of loose solid materials. Do not hose down the area to a storm drain or ditch. — Stock cleanup materials, such as brooms, dustpans, and vacuum sweepers near the storage area. Activity Sheet A-11 – Cleaning or Washing of Tools and Equipment • Tool and equipment wash water is considered process water, and must discharge to the sanitary sewer, a holding tank, or a process treatment system, regardless of the washing method used. • You are encouraged to recycle your wash water with an enclosed loop system or use self-contained parts washers. Numerous products are commercially available that recycle and contain wash water and cleaning solvents. Stormwater Technical Information Report B-52 Memorial Park Phase 2, Tukwila, Washington MAGNUSSON KLEMENCIC ASSOCIAres • If you cannot connect discharges to a sanitary sewer, process treatment system, or holding tank, you must contact the Washington State Department of Ecology and go through the Individual Wastewater Discharge permit process. • Lawnmowers may be rinsed with water only on a lawn or similar area as long as the rinsed -off grass clippings will not be washed to the storm drain system or surface waters when it rains. Wash water from oily or similarly contaminated lawn maintenance equipment is not allowed to flow to or discharge to any stormwater system or surface water. Activity Sheet A-20 — Concrete and Asphalt Application • Sweep parking lots, storage areas, and driveways as needed to collect dirt, waste, and debris. Do not hose down the area to the storm drainage system. • Cover and contain all nearby storm drains at the beginning of the workday. Drain covers and other containment devices are commercially available to keep runoff out of the storm drainage system. All solids collected must be disposed of properly at the end of the workday (or more frequently) prior to removing the containment or cover device(s). • Contain and collect the slurry from exposed aggregate washing. Never allow the slurry to get into a storm drain, ditch, roadway shoulder or gutter. Use a storm drain cover, inlet protection, or other containment device, such as a hand—dug, lined sump, to direct and contain slurry. All collected runoff must be disposed of properly. • Do not discharge concrete, slurry, or rinse water into gutters, storm drains, or drainage ditches or onto the paved surface of a roadway or driveway. • Designate an area on site where hand tools will be cleaned and the water collected for disposal. Commercial products and services are also available for concrete, slurry, and rinse water containment and disposal. • Sweep the pouring area at the end of the job or more frequently if needed. Collect loose aggregate chunks and dust. Do not hose down the area to a storm drain. Activity Sheet A-31 — Vehicle and Equipment Parking and Storage • Sweep parking lots, storage areas, and driveways as needed to collect dirt, waste, and debris. Do not hose down the area to the storm drainage system. • If washing/pressure washing of the parking lot occurs, the wash water must be collected and discharged to a sanitary sewer or other treatment system. There are services that will clean parking lots and collect water for off-site disposal. Never drain wash water to the storm drainage system. • Gravel and dirt lots may require additional BMPs to prevent sediment -laden water from leaving the site. Vehicles can track dirt out of parking and storage areas onto public roadways. Basic sediment controls as outlined in Appendix D ("Erosion and Sediment Control Standards") of the King County Surface Water Design Manual must be installed if other BMPs do not adequately control sediment laden water from entering off site storm water conveyance systems or surface water. Wheel wash Stormwater Technical Information Report B-52 Memorial Park Phase 2, Tukwila, Washington MAGNUSSON KLEMENCIC ASSOCIATES es facilities may need to be considered if track -out of mud becomes a problem. See Activity Sheet A- 41, "Wheel Wash and Tire Bath Operations." Activity Sheet A-42 — Potable Water Line Flushing or Tank Maintenance • When flushing water lines, filter water through sediment traps. If super -chlorination or chemical treatment is used as part of flushing, the water must be discharged to the sanitary sewer (with applicable permits) or, if a sanitary sewer is not available, the water must be collected and disposed of appropriately. Water cannot be discharged directly to stormwater systems unless it is treated and water quality standards are met. Discharging treated water to stormwater systems requires approval from the Washington State Department of Ecology. Activity Sheet A-44 — Dust Control and Soil Erosion and Sediment Control for Manufacturing and Other Commercial Operations ■ Sweep paved areas as needed where dust accumulates from commercial, manufacturing, and industrial operations. Use power vacuum cleaners and sweepers as appropriate to minimize generating airborne dust and for more efficient dust removal. ■ Regularly clean equipment and vehicles subject to dust accumulation from operations. Never wash down equipment or vehicles to the storm drainage system. • Stabilize or cover areas of exposed or disturbed soil where necessary to prevent soil erosion. See the King County Surface Water Design Manual, Appendix D, Erosion and Sediment Control Standards, for recommended erosion and sediment control practices and standards. • Ensure employees are trained in the proper operating procedures to minimize dust accumulation on the ground. SECTION 9: BOND QUANTITIES WORKSHEET, RETENTION/DETENTION FACILITY SUMMARY SHEET AND DECLARATION OF COVENANT Not applicable. This item is specific to work in unincorporated King County. SFCTION 1n• OPERATIONS AND MAINTENANCE MANUAL Not applicable. There are no new flow control or water quality facilities proposed for this project. Stormwater Technical Information Report B-52 Memorial Park Phase 2, Tukwila, Washington FIGURES ■ MAGNUSSON KLEMENCIC ASSOCIATES 10. MAGNUSSON KLEMENCIC ASSOC,ATES FIGURE 1-1: VICINITY MAP Stormwater Technical Information Report B-52 Memorial Park Phase 2, Tukwila, Washington 40 20 0 40 scale 1" 40' feet EXISTING WATER QUALITY TREATMENT (STORMFILTER(, TYP PHASE 2 SITE DISTURBANCE AREA, TYP MAGNUSSON KLEMENCIC ASSOC ALES RAISBECK AVIATION HIGH SCHOOL EXISTING STORM DRAIN, TYP 11111. Cr,M 1.1,11 PHASE 7 LIMITS OF WORK, TYP PROPERTY LINE, •`YP EXISTING KING COUNTY OUTFALL TO SLIP 6 FIGURE 1-2: SITE DRAINAGE AREA, CHARACTERISTICS, AND EXISTING STORM DRAIN SYSTEM \ Stormwater Technical Information Report B-52 Memorial Park Phase 2, Tukwila, Washington 11' 40 2. 0 0 40 scale 40' feet MA(..INt Kt I MI NCIC 1 .17 10 -A11,11 -NI l'T11 )1,V)11111,.'. - PHA -4- )11) 1 ARFA. • 411011,111•410180.90111101. 1)PA 11 TY)) '.-01kAiNS To EXIStriNertokiS $10001)444 " • iv.'STfm , —............ W 10 Or. MO °MINS TO ApJACENT PROPERTY CAICHNikNT ARA 1)X1111,J0 1-16 U.it IN, ) fiF _ 1 Pi1)),Pl.ktY [NL, FIGURE 1-2: SITE DRAINAGE AREA, CHARACTERISJICS, AND EXISTING STORM DRAIN SYSTEM Stormwater Technical Information Report B-52 Memorial Park Phase 2, Tukwila, Washington 1 40 20 0 40 scale 1" : 40' feet PHASE 2 SITE . DISTURBANCE AREA, TYP • -' L MAGNUSSON KLEMENCIC ASSOCALES NI RAISBECK AVIATION HIGH SCHOOL ..,co Ama, PHASE 2 LIMITS OF WORK, TYP PROPERTY LINE, TYP FIGURE 2-1: SITE DISTURBANCE AREA Stormwater Technical Information Report B-52 Memorial Park Phase 2, Tukwila, Washington 12 I, 40 20 0 40 scale 1" = 40' feet .1\1` PHASE 2 LIMITS OF WORK, TYP MIND ao EXISITNG PERVIOUS AREA PRIOR TO P EXISTING IMPERVIOIUS AREA PRIOR TO PHASE 1 MAGNUSSON KLEMENCIC ASSOC ALES RAISBECK AVIATION HIGH SCHOOL yo gig \ ®e \ • elk �\ e \ \ `l ee \ 11AS ee e " A✓ .� \\ r RASE I ..� \ \ .t/Nr�r atur►�:-'-, PROPERTY LINE, TYP FIGURE 2-2: EXISTING PERVIOUS AND IMPERVIOUS AREAS Stormwater Technical Information Report B-52 Memorial Park Phase 2, Tukwila, Washington 13 40 20 0 40 Miiiiii scale 1 :40' feet PHASE 2 IMPERVIOUS AREA, TYP PHASE 1 IMPERVIOUS AREA L MAGNUSSON KLEMENCIC ASSOC:AI ES W RAIS8EOK AVIATION HIGH SCHOOL 412•• PIO MO \ PHASE 1 IMPERVIOUS PHASE 2 OMITS AREA PROPERTY LINE. TYP PERVIOUS AREA , Oh WORK,. TYP TYP FIGURE 2-3: PROPOSED PERVIOUS AND IMPERVIOUS AREAS Stormwater Technical Information Report B-52 Memorial Park Phase 2, Tukwila, Washington 1,4 July 10, 2018 City of Tukwila Department of Community Development STAN JAWOROWSKI 110 UNION ST, SUITE 300 SEATTLE, WA 98101 RE: Correction Letter # 1 to Revision #1 DEVELOPMENT Permit Application Number D 18-0088 MUSEUM OF FLIGHT - B-52 PLAZA - 9404 E MARGINAL WAY S Dear STAN JAWOROWSKI, Allan Ekberg, Mayor Jack Pace, Director This letter is to inform you of corrections that must be addressed before your development permit can be approved. All correction requests from each department must be addressed at the same time and reflected on your drawings. I have enclosed comments from the following departments: PLANNING DEPARTMENT: Lynn Miranda at 206-433-7162 if you have questions regarding these comments. • No building or development permits can be approved until the Shoreline Substantial Development permit is approved. A NOD has not yet been issued. Please address the comments above in an itemized format with applicable revised plans, specifications, and/or other documentation. The City requires that two (2) sets of revised plan pages, specifications and/or other documentation be resubmitted with the appropriate revision block. In order to better expedite your resubmittal, a'Revision Submittal Sheet' must accompany every resubmittal. I have enclosed one for your convenience. Corrections/revisions must be made in person and will not be accepted through the mail or by a messenger service. Sincerely, Bill Rambo Permit Technician File No. D18-0088 6300 Southcenter Boulevard Suite #100 • Tukwila Washington 98188 • Phone 206-431-3670 • Fax 206-431-3665 July 10, 2018 r 1 c City of Tukwila Department of Community Development STAN JAWOROWSKI 110 UNION ST, SUITE 300 SEATTLE, WA 98101 RE: Correction Letter # 2 DEVELOPMENT Permit Application Number D 18-0088 MUSEUM OF FLIGHT - B-52 PLAZA - 9404 E MARGINAL WAY S Dear STAN JAWOROWSKI, Allan Ekberg, Mayor Jack Pace, Director This letter is to inform you of corrections that must be addressed before your development permit can be approved. All correction requests from each department must be addressed at the same time and reflected on your drawings. I have enclosed comments from the following departments: PLANNING DEPARTMENT: Lynn Miranda at 206-433-7162 if you have questions regarding these comments. • No building or development permits can be approved until the Shoreline Substantial Development permit is approved. A NOD has not yet been issued. Please address the comments above in an itemized format with applicable revised plans, specifications, and/or other documentation. The City requires that two (2) sets of revised plan pages, specifications and/or other documentation be resubmitted with the appropriate revision block. In order to better expedite your resubmittal, a 'Revision Submittal Sheet' must accompany every resubmittal. I have enclosed one for your convenience. Corrections/revisions must be made in person and will not be accepted through the mail or by a messenger service. Sincerely, R_tti Bill Rambo Permit Technician File No. D18-0088 6300 Southcenter Boulevard Suite #100 • Tukwila Washington 98188 • Phone 206-431-3670 • Fax 206-431-3665 April 05, 2018 J. City of Tukwila Department of Community Development STAN JAWOROWSKI 110 UNION ST, SUITE 300 SEATTLE, WA 98101 RE: Correction Letter # 1 DEVELOPMENT Permit Application Number D18-0088 MUSEUM OF FLIGHT - B-52 PLAZA - 9404 E MARGINAL WAY S Dear STAN JAWOROWSKI, Allan Ekberg, Mayor Jack Pace, Director This letter is to inform you of corrections that must be addressed before your development permit can be approved. All correction requests from each department must be addressed at the same time and reflected on your drawings. I have enclosed comments from the following departments: PLANNING DEPARTMENT: Lindsay Brown at (206)-433-7166 if you have questions regarding these comments. • 1. You'll need to apply for a Shoreline Substantial Development Permit. Please visit our Permit center at http://www.tukwilawa.gov/departments/permit-center/ and fill out an application. Shoreline permits require public notice and the State Shorelines Board prohibits action on an approved Shoreline permit for a 30 -day appeal period. 2. Please describe and depict the species and location of the replacement trees required for the proposed tree removal. If not all the replacement trees can be accommodated on the site, payment into the City's Tree Fund will be required. Currently the rate is $124 per replacement tree required; this number may change in the near future. Tree replacement calculations can be found in TMC 18.44.080. This request to modify landscaping in the Shoreline can be processed in conjunction with the Shoreline permit. 3. No building or development permits can be approved until the Shoreline permit is approved. PW DEPARTMENT: Joanna Spencer at 206-431-2440 if you have questions regarding these comments. • 1) The Storm Water TIR has been prepared using the 2009 King County Surface water design Manual, however the City of Tukwila has adopted the 2016 edition. Please revise your TIR report to reflect the 2016 KC SWDM. 2) Sheet L3.00 shows a bioretention planter. Please include a maintenance manual for the bioretention planter to assure that it will be functioning properly in the future. 3) Submit a copy of the recorded storm drainage easement KC recording # 199509180955. 4) Submit a letter from King County, who is the beneficiary of the above easement that they are not objecting to your proposal. What happens if the KC storm drainage pipe needs to be maintained and/or pipe segment under the displayed B-52 aircraft replaced. Should a proactive approach be taken to slip line this pipe segment now to avoid future pipe repair or maintenance? 5) The Geotech engineer of record shall review the drawings and submit a letter confirming that the plans meet all the conditions/recommendations of the Feb. 5, 2016 geotech report for MOF B-52 Foundation. Please address the comments above in an itemized format with applicable revised plans, specifications, and/or other documentation. The City requires that two (2) sets of revised plan pages, specifications and/or other documentation be resubmitted with the appropriate revision block. In order to better expedite your resubmittal, a 'Revision Submittal Sheet' must accompany every resubmittal. I have enclosed one for your convenience. Corrections/revisions must be made in person and will not be accepted through the mail or by a messenger service. i(3nn r.:.,, u 11111 n41Q4 - ni u 711.0 42 1 24'7n - c . ^)n.t 421 ?LLC Sincerely, Bill Rambo Permit Technician File No. D18-0088 6300 Southcenter Boulevard Suite # 100 • Tukwila Wachinatnn 9R 1 RR • Phnno 2fF_d 71 _ 7F7t1 • Fnr 71)F -e1? 1 - 7FF rf City of Tukwila Department of Community Development November 16, 2018 ELIAS GARDNER 110 UNION STREET, STE 300 SEATTLE, WA 98101 RE: Correction Letter # 1 to Revision #2 DEVELOPMENT Permit Application Number D18-0088 MUSEUM OF FLIGHT - B-52 PLAZA - 9404 E MARGINAL WAY S Dear ELIAS GARDNER, Allan Ekberg, Mayor Jack Pace, Director This letter is to inform you of corrections that must be addressed before your development permit can be approved. All correction requests from each department must be addressed at the same time and reflected on your drawings. I have enclosed comments from the following departments: PLANNING DEPARTMENT: Contact Lynn Miranda at 206-433-7162 if you have questions regarding these comments. • 1. Sheet C002. Under General, add note "Contact City's Urban Environmentalist (Andrea.cummins@Tukwilawa.gov) prior to any construction activity taking place to verify tree protection measures are installed. 2. L1.00. Show location of any lighting fixtures. 3. LI.10. Add lighting fixtures to Furnishings Schedule. 4. L5.10. a. Malus fusca is appropriate for a wetland area — replace with a more appropriate tree. b. Rhamnus purshiana is a shrub, not a tree. Identify an appropriate replacement tree. c. Add plant spacing for shrubs, annuals, grasses. d. Legend for shrub areas does not correspond to plan. e. Native meadow mix. Specify the type of species included in this mix. Add amount of native meadow seed grass — need 5-25 lbs. per acre, depending on species. f. Turf grass. Specify the species of grass proposed. Since most of this planting falls within the shoreline jurisdiction, it must be a native grass seed mix. 5. Sheet L5.20. 80 replacement trees are required as part of the project; 38 replacement trees are proposed. There is significantly more area available for planting on the west side of the site, even with the King County easement. Add more replacement trees on site. If additional trees cannot be planted on the site, the applicant shall pay $126 per tree into the City's Tree Replacement Fund. Please address the comments above in an itemized format with applicable revised plans, specifications, and/or other documentation. The City requires that two (2) sets of revised plan pages, specifications and/or other documentation be resubmitted with the appropriate revision block. In order to better expedite your resubmittal, a 'Revision Submittal Sheet' must accompany every resubmittal. I have enclosed one for your convenience. Corrections/revisions must be made in person and will not be accepted through the mail or by a messenger service. 6300 Southcenter Boulevard Suite #100 • Tukwila Washington 98188 • Phone 206-431-3670 • Fax 206-431-3665 Sincerely, --tca R-01 Bill Rambo Permit Technician File No. D18-0088 6300 Southcenter Boulevard Suite #100 • Tukwila Washington 98188 • Phone 206-431-3670 • Fax 206-431-3665 City of Tukwila Allan Ekberg, Mayor Department of Community Development - Jack Pace, Director October 2, 2018 Elias Gardner 110 Union St, Ste 300 Seattle, WA 98101 RE: Request for Application Extension #1 Permit Number D18-0088 Dear Elias Gardner, This letter is in response to your written request for an extension to Application Number D18-0088. The Building Official, Jerry Hight, has reviewed your letter and considered your request to extend the above referenced permit. It has been determined that the City of Tukwila Building Division will be granting an extension to the permit application through March 26, 2019. If you should have any questions, please contact our office at (206) 433-7165. Sincerely, V/ P11/1) Rachelle Ripley Permit Technician File: Permit No. D18-0088 Tukwila City Hall • 6200 Southcenter Boulevard • Tukwila, WA 98188 • 206-433-1800 • Website: TukwilaWA.gov Rachelle Ripley From: Michael Canales <MCanales@srgpartnership.com> Sent: Friday, August 31, 2018 12:00 PM To: Rachelle Ripley Cc: Elias Gardner; Aaron Pleskac Subject: Permit #D18-0088 Application Extension Good afternoon Rachelle, This email is in response to our earlier phone call, regarding Permit #D18-0088. The project name, for your reference, is titled "B-52 Memorial Park — Ph 2". As previously mentioned, SRG Partnership would like to extend the expiration date for this project's Building and Public Works Permit Application. The reason for this extension is that the Owner is requesting a redesign of the park and aircraft configuration, in order to satisfy King County requirements relating to the drainage easement that exists on the project site. Additionally, the design team anticipates resubmitting revised drawings and supporting documents as a Permit Revision towards the end of the month of September. I look forward to working with you through the permitting process. Have a great holiday weekend, Michael Canales, AIA Designer D 206 973 1684 0 206 973 1700 SRG PARTNERSHIP, INC srgpartnership.com CAUTION: This email originated from outside the City of Tukwila network. Please DO NOT open attachments or click links from an unknown or suspicious origin. 1iRequest for Extension. # Current Expiration Date: Extension Request: VApproved for days 1 Denied (provide explanation) 1 1 Signature •nitials 1 August 31, 2018 City of Tukwila Department of Community Development ELIAS GARDNER 110 UNION STREET, STE 300 SEATTLE, WA 98101 RE: Correction Letter # 2 Revision #1 DEVELOPMENT Permit Application Number D 18-0088 MUSEUM OF FLIGHT - B-52 PLAZA - 9404 E MARGINAL WAY S Dear ELIAS GARDNER, Allan Ekberg, Mayor Jack Pace, Director This letter is to inform you of corrections that must be addressed before your development permit can be approved. All correction requests from each department must be addressed at the same time and reflected on your drawings. I have enclosed comments from the following departments: PLANNING - C DEPARTMENT: Lynn Miranda at 206-433-7162 if you have questions regarding these comments. • Submit revised and updated sheets A100, C003, 10.00, L5.10, L5.20, S001 and S002 to reflect attached red lined notes. Please address the comments above in an itemized format with applicable revised plans, specifications, and/or other documentation. The City requires that two (2) sets of revised plan pages, specifications and/or other documentation be resubmitted with the appropriate revision block. In order to better expedite your resubmittal, a 'Revision Submittal Sheet' must accompany every resubmittal. I have enclosed one for your convenience. Corrections/revisions must be made in person and will not be accepted through the mail or by a messenger service. If you have any questions, I can be reached at (206)433-7165. Sincerely, Rachelle Ripley Permit Technician File No. D18-0088 6300 Southcenter Boulevard Suite #100 • Tukwila Washington 98188 • Phone 206-431-3670 • Fax 206-431-3665 Bill Rambo From: Elias Gardner <EGardner@srgpartnership.com> Sent: Wednesday, August 8, 2018 9:05 AM To: Bill Rambo Subject: Museum of Flight permit #D18-0088 Hello Bill — Thanks for fielding my call this morning. As discussed, I've inherited Stan Jaworoski's work on the Museum of Flight's B- 52 Plaza as he's stepped away from SRG Partnership, and I will act as the new primary point of contact for this permit. Please direct all forthcoming communications to me — my contact information is below. Many thanks to the team at City of Tukwila for the continued support and oversight for the Museum's endeavors. ELIAS GARDNER, Assoc. AIA Associate, LEED AP D 206 973 1685 0 206 973 1700 SRG PARTNERSHIP, INC 110 UNION STREET, SUITE 300 SEATTLE, WA 98101 srgpartnership.com CAUTION: This email originated from outside the City of Tukwila network. Please DO NOT open attachments or click links from an unknown or suspicious origin. RECEIVED CITY OF TUKWILA AUG 0 8 2018 PERMIT CENTER 1 8/1/2018 City of Tukwila Department of Community Development STAN JAWOROWSKI 110 UNION ST, SUITE 300 SEATTLE, WA 98101 RE: Permit Application No. D18-0088 MUSEUM OF FLIGHT - B-52 PLAZA 9404 E MARGINAL WAY S Dear STAN JAWOROWSKI, Allan Ekberg, Mayor Jack Pace, Director In reviewing our current application files, it appears that your permit applied for on 3/26/2018, has not been issued by the City of Tukwila Permit Center. Per the International Building Code, International Mechanical Code, Uniform Plumbing Code and/or National Electrical Code every permit application not issued within 180 days from the date of application shall expire and become null and void. Currently your application has a status of UNDER REVIEW and is due to expire on 9/26/2018. If you still plan to pursue your project, you are hereby advised to do one of the following: 1) If the plan review is complete for the project and your application is approved, you may pick up the application before the date of expiration. At the time of permit issuance the expiration date will automatically be extended 180 days. -or- 2) If the plan review is not completed submit a written request for application extension (7) seven days in advance of the expiration date. Address your extension request to the Building Official and state your reason(s) for the need to extend your application. The Building Code does allow the Building Official to approve one extension of up to 90 days. If it is determined that your extension request is granted, you will be notified by mail. In the event that we do not receive your written request for extension or request is denied, your permit application will expire and your project will require a new permit application, plans and specifications, and associated fees. Thank you for your cooperation in this matter. Sincerely, RVhilittat Permit Technician File No: D18-0088 17,,p(u) 6300 Southcenter Boulevard Suite #100 • Tukwila Washington 98188 • Phone 206-431-3670 • Fax 206-431-3665 PLAN REVIEW/ROUTING SLIT PERMIT NUMBER: D18-0088 DATE: 11/28/18 PROJECT NAME: MUSEUM OF FLIGHT- B-52 PLAZA SITE ADDRESS: 9404 E MARGINAL WAY S Original Plan Submittal Revision # X Response to Correction Letter # 1 before Permit Iss ed X Revision # 2 after Permit Issue ;d DEPARTMENTS: Building Division Public Works n Fire Prevention Structural Lr' A c Planning Divis on ❑ Permit Coordirttor IP PRELIMINARY REVIEW: Not Applicable n (no approval/review required) REVIEWER'S INITIALS: DATE: 11/29/18 Structural Review Required DATE: u APPROVALS OR CORRECTIONS: Approved Corrections Required n Approved with Conditions Denied (corrections entered in Reviews) (ie: Zoning Issues) DUE DATE: 12/27/18 n n Notation: REVIEWER'S INITIALS: DATE: Permit Center Use Only CORRECTION LETTER MAILED: Departments issued corrections: Bldg 0 Fire 0 Ping 0 PW D Staff Initials: 12/18/2013 PLAN REVIEW/ROUTING SLIP PERMIT NUMBER: D18-0088 DATE: 10/23/18 PROJECT NAME: MUSEUM OF FLIGHT B-52 PLAZA SITE ADDRESS: 9404 E MARGINAL WAY S Original Plan Submittal Revision # before Permit issued Response to Correction Letter # X Revision # 2 after Pern it Issued DEPARTMENTS: A-ic, AIA N//-�- tit(0 L./� COrrj2 11 -7-4 Division Fire Prevention PlanningDivis/t3- on g .).5 A W C. '1 Public Works Structural ❑ Permit CoordirNtor PRELIMINARY REVIEW: Not Applicable (no approval/review required) DATE: 10/2/18 Structural Review Required REVIEWER'S INITIALS: DATE: APPROVALS OR CORRECTIONS: Approved Corrections Required n Approved with Conditions Denied (corrections entered in Reviews) I ` (ie: Zoning Issues) DUE DATE: 11/22/18 Notation: REVIEWER'S INITIALS: DATE: Permit Center Use Only II �rj,�, CORRECTION LETTER MAILED: k `' ( S Departments issued corrections: Bldg D Fire D Ping)( PW ❑ Staff Initials: 12/18/2013 11 PLAN REVIEW/ROUTING SLIP PERMIT NUMBER: D18-0088 DATE: 10/23/18 PROJECT NAME: MUSEUM OF FLIGHT B-52 PLAZA SITE ADDRESS: 9404 E MARGINAL WAY S Original Plan Submittal X Response to Correction Letter # 2 Revision # before Permit Issued X Revision # 1 after Permit Issued DEPARTMENTS: Building Division Public Works Fire Prevention Structural Planning Division 111 ❑ Permit Coordinator EU PRELIMINARY REVIEW: Not Applicable ri (no approval/review required) DATE: 10/25/18 Structural Review Required REVIEWER'S INITIALS: DATE: n APPROVALS OR CORRECTIONS: Approved Approved with Conditions Corrections Required Denied (corrections entered in Reviews) (ie: Zoning Issues) DUE DATE: 11/22/18 n Notation: REVIEWER'S INITIALS: DATE: Permit Center Use Only CORRECTION LETTER MAILED: Departments issued corrections: Bldg ❑ Fire ❑ Ping ❑ PW ❑ Staff Initials: 12/18/2013 ERCT COORD COPY PLAN REVIEW/ROUTING SLIP PERMIT NUMBER: D18-0088 DATE: 07/24/18 PROJECT NAME: MUSEUM OF FLIGHT - B-52 PLAZA SITE ADDRESS: 9404 E MARGINAL WAY S Original Plan Submittal X Response to Correction Letter # 1 REV #1 Revision # before Permit Issued Revision # after Permit Issued DEPARTMENTS: Building Division Public Works Fire Prevention Structural leftel Planning Division %hilt Permit Coordinator ❑ PRELIMINARY REVIEW: Not Applicable ❑ (no approval/review required) DATE: 07/26/18 Structural Review Required REVIEWER'S INITIALS: DATE: APPROVALS OR CORRECTIONS: Approved Corrections Required ❑ Approved with Conditions ❑ Denied (corrections entered in Reviews) (ie: Zoning Issues) Notation: DUE DATE: 08/23/18 REVIEWER'S INITIALS: DATE: Permit Center Use Only l'hIP CORRECTION LETTER MAILED: tt Departments issued corrections: Bldg 0 Fire 0 Ping [] PW 0 Staff Initials: 12/18/2013 :=PERMIT COORD COPY 0 PLAN REVIEW/ROUTING SLIP PERMIT NUMBER: D18-0088 DATE: 07/24/18 PROJECT NAME: MUSEUM OF FLIGHT — B-52 PLAZA SITE ADDRESS: 9404 E MARGINAL WAY S Original Plan Submittal X Response to Correction Letter # 2 Revision # before Permit Issued Revision # after Permit Issued DEPARTMENTS: Building Division Public Works El El Fire Prevention Structural Pct G k /\ c6I I 1(6 Planning Division p Permit Coordinator PRELIMINARY REVIEW: Not Applicable ❑ (no approval/review required) DATE: 07/26/18 Structural Review Required REVIEWER'S INITIALS: DATE: APPROVALS OR CORRECTIONS: Approved Corrections Required ❑ Approved with Conditions ❑ Denied (corrections entered in Reviews) (ie: Zoning Issues) DUE DATE: 08/23/18 El Notation: REVIEWER'S INITIALS: DATE: Permit Center Use Only CORRECTION LETTER MAILED: Departments issued corrections: Bldg 0 Fire 0 Ping ❑ PW ❑ Staff Initials: 12/18/2013 11 r� `'PERMIT COORD COPY PLAN REVIEW/ROUTING SLIP PERMIT NUMBER: D18-0088 DATE: 06/04/18 PROJECT NAME: MUSEUM OF FLIGHT - B-52 PLAZA SITE ADDRESS: 9404 E MARGINAL WAY S Original Plan Submittal X Revision # 1 before Permit Issued Response to Correction Letter # Revision # after Permit Issued DEPARTMENTS: AT Al 194( 8 tik Building Division IN Fire Prevention Ne\ (44-46 Public Works Structural (07-48 n 144 CortZ1 8 Planning Division 110 Permit Coordinator PRELIMINARY REVIEW: Not Applicable n (no approval/review required) REVIEWER'S INITIALS: DATE: 06/05/18 Structural Review Required DATE: n APPROVALS OR CORRECTIONS: Approved n Corrections Required T (corrections entered in Reviews) DUE DATE: 07/03/18 Approved with Conditions ❑ Denied (ie: Zoning Issues) Notation: REVIEWER'S INITIALS: DATE: Permit Center Use Only CORRECTION LETTER MAILED: 0^ Departments issued corrections: Bldg ❑ Fire 0 Ping PW 0 Staff Initials: 12/18/2013 PERMIT COORD COPY PLAN REVIEW/ROUTING SLIP PERMIT NUMBER: D18-0088 DATE: 06/04/18 PROJECT NAME: MUSEUM OF FLIGHT - B-52 PLAZA SITE ADDRESS: 9404 E MARGINAL WAY S Original Plan Submittal Revision # before Permit Issued X Response to Correction Letter # 1 Revision # after Permit Issued DEPARTMENTS: Building Division nn PW(j ublic Works Fire Prevention Structural LP1 Corry Planning Divison ❑ Permit Coordinator 111 PRELIMINARY REVIEW: Not Applicable n (no approval/review required) DATE: 06/05/18 Structural Review Required REVIEWER'S INITIALS: DATE: n APPROVALS OR CORRECTIONS: DUE DATE: 07/03/18 Approved ❑ Approved with Conditions Corrections Required Denied (corrections entered in Reviews) (ie: Zoning Issues) Notation: REVIEWER'S INITIALS: DATE: Permit Center Use Only CORRECTION LETTER MAILED: ...7.-10'1 Y/ Departments issued corrections: Bldg ❑ Fire 0 Ping PW 0 Staff Initials: V� • 12/18/2013 1 � +JERMIT COORD COPY. PLAN REVIEW/ROUTING SLIP PERMIT NUMBER: D18-0088 DATE: 03/26/18 PROJECT NAME: MUSEUM OF FLIGHT - B-52 PLAZA SITE ADDRESS: 9404 E MARGINAL WAY S X Original Plan Submittal Revision # before Permit Issued Response to Correction Letter # Revision # after Permit Issued DEPARTMENTS: N /Att.; Building Division 11°�11ttd Public Works Irl Fire Prevention Structural 10) c o g. Planning Division ri Permit Coordinator II PRELIMINARY REVIEW: Not Applicable n (no approval/review required) DATE: 03/27/18 Structural Review Required REVIEWER'S INITIALS: DATE: APPROVALS OR CORRECTIONS: Approved Corrections Required (corrections entered in Reviews) Approved with Conditions Denied (ie: Zoning Issues) DUE DATE: 04/24/18 n n Notation: REVIEWER'S INITIALS: DATE: Permit Center Use Only CORRECTION LETTER MAILED: LAS _t Departments issued corrections: Bldg ❑ ,Fire 0 Ping jV PW [ Staff Initials: 12/18/2013 PROJECT NAME: Kneuw\ o Tit 1 -PZ' PERMIT NO: I 1e_ao 9$ SITE ADDRESS: CNOM rr1; w,,,1$ ORIGINAL ISSUE DATE: REVISION LOG REVISION NO. DATE RECEIVED STAFF INIT LS ISSUED DATE STAFF INIIT ALS 2, 1.0-2-5- fj�� ` 11-1 - t Summary of Revision: ret pe(vcaa I ov% a ► w1'e► dternt OJ Received by: 2 iM h (fJ REVISION NO. DATE RECEIVED STAFF INITIALS ISSUED DATE STAFF INITIALS 2, 1.0-2-5- we 11-1 - t Summary of Revision: Summary of Revision: Co ,i1,l r e re coy`,1.4��, 44Lty, i- 0. -c rot pt- ciAnct "?1,144—, Received by: vyi,v*------ et i iii,Crki (1a e print) REVISION NO. DATE RECEIVED STAFF INITIALS ISSUED DATE STAFF INITIALS Summary of Revision: Received by: Received by: (please print) REVISION NO. DATE RECEIVED STAFF INITIALS ISSUED DATE STAFF INITIALS Summary of Revision: Received by: Received by: (please print) REVISION NO. DATE RECEIVED STAFF INITIALS ISSUED DATE STAFF INITIALS Summary of Revision: Received by: (please print) REVISION NO. DATE RECEIVED STAFF INITIALS ISSUED DATE STAFF INITIALS Summary of Revision: Received by: (please print City of Tukwila Department of Community Development 6300 Southcenter Boulevard, Suite # 100 Tukwila, Washington 98188 Phone: 206-431-3670 Web site: http://www.TukwilaWA.gov REVISION SUBMITTAL Revision submittals must be submitted in person at the Permit Center. Revisions will not be accepted through the mail, fax, etc. Date: 11/28/2018 Plan Check/Permit Number: D18-0088 ❑ Response to Incomplete Letter # Xn Response to Correction Letter # 1, to Revision #2 Revision # after Permit is Issued Revision requested by a City Building Inspector or Plans Examiner Deferred Submittal # RECEIVED CITY OF TUKWILA NOV 28 2018 PERMIT CENTER Project Name: Museum of Flight_B-52 Plaza Project Address: 9404 E Marginal Way S. Contact Person: Michael Canales Phone Number: 206.973.1684 Summary of Revision: 1. Note added. 2. Proposed light fixtures have been added to sheet L1.00. 3. Proposed light fixtures have been added to the furnishing schedule on sheet L1.10. 4a. Malus fusca is not wetland obligate and does well throughout the PNW. It also shows up on a number of approved street tree lists for various regional municipalities and is considered to be reasonably tolerant of drought. See additional information attached. 4b. Rhamnus purshiana from the nursery will have a single trunk and will grow as a proper tree to 25'+ over time. See additional information attached. 4c. Plant spacing has been added to the plant schedule on sheet L5.10. 4d. The legend on sheet L5.10 has been updated to reflect what is shown on the plan. 4e. A meadow mix legend has been added to sheet L5.20. 4f. Turf grass mix legend has been added to sheet L5.20. 5. The project would like to pay into the City's Tree Replacement Fund for the 42 trees that are not being replaced. Sheet Number(s): C002, L1.00, L1.10, L5.10, L5.20 "Cloud" or highlight all areas of revision including 1date of revision Received at the City of Tukwila Permit Center by: h Ed Entered in TRAKiT on 11 IA /% W:\Permit Center\Templates\Forms\Revision Submittal Form.doc Revised. August 2015 11. Date: City of Tukwila REVISION SUBMITTAL Department of Community Development 6300 Southcenter Boulevard, Suite #100 Tukwila, Washington 98188 Phone: 206-431-3670 Web site: http://www.TukwilaWA.gov Revision submittals must be submitted in person at the Permit Center. Revisions will not be accepted through the mail, fax, etc. 10/23/18 Plan Check/Permit Number: D18-0088 ❑ Response to Incomplete Letter # • Response to Correction Letter # 2 Revision #1 Revision # a, after Permit is Issued ❑ Revision requested by a City Building Inspector or Plans Examiner ❑ Deferred Submittal # Project Name: Museum of Flight B-52 Plaza Project Address: 9404 E Marginal Way S Contact Person: MICHAEL CANALES Phone Number: 206.973.1684 RECEIVED CITY OF TUKWILA OCT 2 3 2018 PERMIT CENTER Summary of Revision: The design of the rnemorialpark has been revised to satisfy King County and Museum of Flight requirements relating to the drainage easement that exists on the project site. This included reconfiguring the aircraft so that it did not sit above the easement, redesigning the park around the new aircraft configuration, re -striping the adjacent parking areas, and revising the structural support of the aircraft. G100, A100, C001, C002, C101, C102, C201, C202, L0.00, L1.00, L1.10, L1.20, L2.10, L2.20, L3.00, Sheet Number(s): L3.10, L3.11, L4.10, L4.20, L4.30, L5.10, L5.20, L5.30, S000, S001, S002 "Cloud" or highlight all areas of revision including date of revision Received at the City of Tukwila Permit Center by: kr Entered in TRAKiT on W:lPermit Center (Brenda)\Forms\Permit Center Documents (Word»Revision Submittal Forn.doc Revised: August 2015 City of Tukwila Department of Community Development 6300 Southcenter Boulevard, Suite #100 Tukwila, Washington 98188 Phone: 206-431-3670 Web site: http://www.TukwilaWA.gov REVISION SUBMITTAL Revision submittals must be submitted in person at the Permit Center. Revisions will not be accepted through the mail, fax, etc. Date: 23 J''ki 1'° 1e) Plan Check/Permit Number: I 18 - 00 8 S n Response to Incomplete Letter # Lr Response to Correction Letter # I Revision # I after Permit is Issued ❑ Revision requested by a City Building Inspector or Plans Examiner ❑ Deferred Submittal # Project Name: /h NS Gvkvl Fit,9 hf — 8 52 //4Z9 Project Address: q q PL1 44 A rd 1\4 a' ! (A/m y 3 Contact Person: 1I as (r& �''o1 �v / Phone Number: 20& " q 13 - Summary of Revision: /rani114 leo re(G/Gncc RECEIVED CITY OF TUKWILA JUL 232018 PERMIT CENTER !. Ndfl't e o F Dec -4S t`ov+ / /tif-del _ i f di l7 2018/ ,co' 71h. S h c' e liln G S✓%t l- r► KI:,! OtvGI op e' -i , e..�,t .�- (1-10 - 0 0 31) 2. N otl'Le o f D t c -f ave d at -cd I7 J i ty ?Alb/ for 0-\o ft( m e TrLe. kot1 Vey -f� Cleo-�1*0 L (19- 0030) . J J Sheet Number(s): n la "Cloud" or highlight all areas of revision includin: dat oisi Received at the City of Tukwila Permit Center by: Entered in TRAKiT on 1 l 0 W:\Pennit Center \ Templates \For ns\Revision Submittal Form.doc Revised: August 2015 > City of Tukwila Department of Community Development 6300 Southcenter Boulevard, Suite #100 Tukwila, Washington 98188 Phone: 206-431-3670 Web site: http://www.TukwilaWA.gov REVISION SUBMITTAL Revision submittals must be submitted in person at the Permit Center. Revisions will not be accepted through the mail, fax, etc. Date: 23 JULY Plan Check/Permit Number: p 1 0 O O 8 S ❑ Response to Incomplete Letter # Iv( Response to Correction Letter # 2- ❑111 Revision # after Permit is Issued ❑ Revision requested by a City Building Inspector or Plans Examiner ❑ Deferred Submittal # Project Name: /14145614 M F119 hf` - Z3- SZ P 1414 Project Address: q `l 0 y 41 A.79 /yt ti / j^/i,y S Contact Person: E I aS G" t ra/n G✓' / Phone Number: Summary of Revision: frovidea' 0. re(eA I. W o t4 o F D Gvr3',?,t4 d Ate -g/ 1? Jai Tote/ >p . S h 0/.6 (,t46 Sak { ?Let', DL✓U � LS,,,,, (L/�_0o3/) RECEIVED CITY OF TUKWILA JUL 232018 PERMIT CENTER 2-06-973- /685- 2- 68S 2. Ndt)- DGM'SidAt dat-e-cl 17 it, lr wI d I fes- affv,t !line Trtc /LLMclw ) Rai," V tf- 'Ubu.✓) IvM;� CL 1$ - 003 0) Sheet Number(s): n /' "Cloud" or highlight all areas of revision includin da a of evi ''nn Received at the Ci of Tukwila Permit Ce ter I IU'l City by: Entered in TRAKiT on " 1 W:\Permit Ceater\Templates\Forms\Revision Submittal Form.doc Revised: August 2015 City of Tukwila Department of Community Development 6300 Southcenter Boulevard, Suite #100 Tukwila, Washington 98188 Phone: 206-431-3670 Web site: http://www.TukwilaWA.gov REVISION SUBMITTAL RECEIVED CITY OF TUKWILA JUN 0 4 2018 PERMIT CENTER Revision submittals must be submitted in person at the Permit Center. Revisions will not be accepted through the mail, fax, etc. Date: May 31, 2018 Plan Check/Permit Number: D18-0088 ❑ Response to Incomplete Letter # ❑ Response to Correction Letter # 1JRevision # 1 irmit is Issued Rev. 1: Plan change prior to Permit Issue (Changes initiated by Contractor Constructibility Review and King County Easement Review) ❑ Revision requested by a City Building Inspector or Plans Examiner ❑ Deferred Submittal # Project Name: Museum of Flight - B-52 Plaza Project Address: 9404 E Marginal Way S Contact Person: Stan Jaworowski, SRG Partnership Phone Number: (206) 973 1696 Summary of Revision: 1. Revise Aircraft Footing Type: Contractor review suggested pile and pile cap foundation for the aircraft supports instead of spread footing as had been shown in submitted permit drawings. Documentation: Revised structural drawings as noted below, supporting revised geotechnical report, attached. 2. Relocate Aircraft (Footings), Delete Trees indicated in Landscape Drawings. King County (King County Airport), in order to maintain access to a storm pipe manhole at the southwest corner of the project site, requested a minimum 16' clear path to that manhole for service equipment access should it be required. This requires deleting trees shown in the planting plan. The path is clear but will not be paved or otherwise distinguished from surrounding landscape seeding. Path of future easement is shown for reference, and is not being built at this time. Documentation: Revised site drawings, landscape drawings as noted below. Sheet Number(s). S000, S001, S002; G011, A100, L5.10, L5.20; revised geotechnical report, structural calcs "Cloud" or highlight all areas of revision including date of revision Received at the City of Tukwila Permit Center by: Entered in TRAKiT on O(v 10 y(/gY W:\Permit Center \Templates\Forms\Revision Submittal Form.doc Revised: August 2015 Pk) City of Tukwila REVISION SUBMITTAL Department of Community Development 6300 Southcenter Boulevard, Suite #100 Tukwila, Washington 98188 Phone: 206-431-3670 Web site: http://www.TukwilaWA.gov Revision submittals must be submitted in person at the Permit Center. Revisions will not be accepted through the mail, fax, etc. Date: May 30, 2018 Plan Check/Permit Number: D18-0088 ❑ Response to Incomplete Letter # RECEIVED CITY OF TUKWILA ® Response to Correction Letter # 1 ❑ Revision # after Permit is Issued JUN 0 4 2018 ❑ Revision requested by a City Building Inspector or Plans Examiner ❑ Deferred Submittal # PERMIT CENTER Project Name: Museum of Flight - B-52 Plaza Project Address: 9404 E Marginal Way S Contact Person: Stan Jaworowski, SRG Partnership Phone Number: (206) 973 1696 Summary of Revision: Planning Department 1. Apply for a Shoreline Substantial Development Permit Response: Permit applied for March 26, 2018; Considered complete on April 23, 2018 (attached) 2. Describe and depict the species and location of replacement trees. Response: See revised L0.00, L5.20, (attached). 3. No building or development permits can be approved until the Shoreline permit is approved. No response required. PW Department 1. Revise Storm Water TIR to reflect the 2016 KC SWDM: Response: Revised TIR attached 2. Provide maintenance manual for bioretention planter Response: See "Museum of Flight B-52 Park Landscape Maintenance Guidelines," attached. 3. Provide copy of the easement: Response: Attached. 4. Provide King County letter indicating they have no objection to the plan: Response: E-mail indicating acceptance attached. County currently drafting a Memo of Understanding detailing the agreement. Copy of the Memo will be provided as soon as it becomes available. 5. Provide Geotech Engineer letter confirming plans meet all the condition/recommendations of the 2016 Geotech Report: Attached. Sheet Number(s). L0.00, L5.20, (Rev TIR, Maint Guide, Easement, KC Easement e-mail, Geotech Engr letter). "Cloud" or highlight all areas of revision including date of revision Received at the City of Tukwila Permit Center by: Entered in TRAKiT on 0G(% 07! l d W:\Permit Center \Templates\Forms\Revision Submittal Form.doc Revised: August 2015 Au) SELLEN CONSTR CO INC IIomc Espanol Contact Search L&I A -Z Index Safety & Health Claims & Insurance Workplace Rights Washington State Department of Labor & Industries SELLEN CONSTR CO INC Owner or tradesperson BADGER, WILLIAM B Principals BADGER, WILLIAM B WAINHOUSE, WILFRED T, VICE PRESIDENT REDMAN, SCOTT B, VICE PRESIDENT AVERY, JOHN N (JACK), TREASURER MCCLESKEY, ROBERT P, PRESIDENT (End: 06/02/2017) REDMAN, RICHARD C, VICE PRESIDENT (End: 06/02/2017) BARRETT, ROBERT E, VICE PRESIDENT (End: 06/02/2017) BOYESON, WILLIAM R, VICE PRESIDENT (End: 06/02/2017) DICKERT, DENNIS A, VICE PRESIDENT (End: 06/02/2017) CARLSON, LORI L, VICE PRESIDENT (End: 06/02/2017) HAFENBRACK, CHARLES, VICE PRESIDENT (End: 06/02/2017) NULPH, KURT F, SECRETARY (End: 06/02/2017) HART, GARY D, TREASURER (End: 06/02/2017) WA UBI No. 578 006 698 PO BOX 9970 SEATTLE, WA 98109 206-682-7770 KING County Business type Corporation License Verify the contractor's active registration / license / certification (depending on trade) and any past violations. Construction Contractor Active. .................._.. _... _.. _......... . Meets current requirements. License specialties GENERAL License no. SELLEC*372ND Effective — expiration 08/20/1963— 06/01/2019 Bond FIDELITY & DEP CO OF MARYLAND $12,000.00 Page 1 of 6 Help My L&i Trades & Licensing Help us improve https://secure.lni.wa.gov/verify/Detail.aspx?UBI=578006698&LIC=SELLEC*372ND&SAW= 12/18/2018 SELLEN CONSTR CO INC Bond account no. 30268557 Received by L&I Effective date 02/21/2002 02/01/2002 Expiration date Until Canceled Insurance .............. American Contractors Ins Co Ri Policy no. GLI8AB00038 $2,000,000.00 Received by L&I Effective date 05/25/2018 06/01/2018 Expiration date 06/01/2019 Insurance history Savings No savings accounts during the previous 6 year period. Lawsuits against the bond or savings No lawsuits against the bond or savings accounts during the previous 6 year period. L&I Tax debts No L&I tax debts are recorded for this contractor license during the previous 6 year period, but some debts may be recorded by other agencies. License Violations No license violations during the previous 6 year period. Workers' comp Do you know if the business has employees? If so, verify the business is up-to-date on workers' comp premiums. This company has multiple workers' comp accounts. Active accounts L&I Account ID 700,374-00 Doing business as SELLEN CONSTRUCTION CO INC Estimated workers reported N/A L&I account contact (360)902-4817 Track this contractor 9 Self Insured. This business is certified to cover its own workers' comp costs. No premiums due. Public Works Strikes and Debarments Verify the contractor is eligible to perform work on public works projects. Contractor Strikes No strikes have been issued against this contractor. Contractors not allowed to bid No debarments have been issued against this contractor. Workplace safety and health Check for any past safety and health violations found on jobsites this business was responsible for. Inspection results date 10/08/2018 Inspection no. 317949232 Location 2100 7th Ave Seattle, WA 98121 Under appeal. The results of the inspection are being challenged. Date of appeal 10/12/2018 Page 2 of 6 Help us improve https://secure.lni.wa.gov/verify/Detail.aspx?UBI=578006698&LIC=SELLEC*372ND&SAW= 12/18/2018 SELLEN CONSTR CO INC Inspection results date 09/13/2018 Inspection no. 317950431 Location 3855 Montevilla Pkwy Bothell, WA 98021 Inspection results date 06/15/2018 Inspection no. 317949638 Location 234 9th Avenue North Seattle, WA 98101 Inspection results date 02/14/2018 Inspection no. 317947121 Location 1430 2nd Ave Seattle, WA 98101 Inspection results date 07/14/2016 Inspection no. 317940769 Location 415 106th Ave NE Bellevue, WA 98005 Inspection results date 05/11/2016 Inspection no. 317940048 Location 800 Howell street Seattle, WA 98101 Inspection results date 05/02/2016 Inspection no. 317940250 Location 17700 272nd st Covington, WA 98042 Inspection results date 04/25/2016 Inspection no. 317939512 Location 415 106th Ave NE Bellevue, WA 98004 Inspection results date 03/10/2016 Inspection no. No violations No violations Violations No violations No violations No violations No violations No violations Page 3 of 6 Help us improve https://secure.lni.wa.gov/verify/Detail.aspx?UBI=578006698&LIC=SELLEC*372ND&SAW= 12/18/2018 SELLEN CONSTR CO INC 317939678 Location 1063 Capital Way Olympia, WA 98501 Inspection results date 02/18/2016 Inspection no. 317938997 Location 2014 9th Ave Seattle, WA 98121 Inspection results date 07/30/2015 Inspection no. 317937143 Location 19602 Vashon Hwy SW Vashon, WA 98070 Inspection results date 07/24/2015 Inspection no. 317936754 Location 415 106th AVE NE Bellevue, WA 98004 Inspection results date 06/25/2015 Inspection no. 317936616 Location 9303 E marginal Way S Tukwila, WA 98108 Inspection results date 06/16/2015 Inspection no. 317936288 Location 501 Fairview Ave N Seattle, WA 98109 Inspection results date 04/30/2015 Inspection no. 317936079 Location 1083 Lake Washington Blvd. Nor Renton, WA 98057 Inspection results date 03/11/2015 Inspection no. 317617785 Location No violations No violations Violations No violations No violations No violations Violations Page 4 of 6 Help us improve https://secure.lni.wa.gov/verify/Detail.aspx?UBI=578006698&LIC=SELLEC*372ND&SAW= 12/18/2018 SELLEN CONSTR CO INC 4558 7th Av NE Seattle, WA 98122 Inspection results date 02/17/2015 Inspection no. 317424927 Location 21601 76th Ave W. Edmonds, WA 98026 Inspection results date 10/27/2014 Inspection no. 317552958 Location 505 Madison St Seattle, WA 98104 Inspection results date 03/26/2014 Inspection no. 316973783 Location 2400 11th Avenue East Seattle, WA 98109 Inspection results date 03/18/2014 Inspection no. 316963305 Location 2021 7th Ave Seattle, WA 98121 Inspection results date 03/17/2014 Inspection no. 316969260 Location 18550 Union Hill Road Redmond, WA 98052 Inspection results date 01/28/2014 Inspection no. 316881796 Location 646 Lenora St Seattle, WA 98121 Inspection results date 01/14/2014 Inspection no. 316960384 Location 1701 Pacific Ave. Tacoma, WA 98402 Violations No violations No violations No violations No violations No violations No violations Page 5 of 6 Help us improve https://secure.lni.wa.gov/verify/Detail.aspx?UBI=578006698&LIC=SELLEC*372ND&SAW= 12/18/2018 SELLEN CONSTR CO INC Page 6 of 6 Inspection results date 12/05/2013 Inspection no. 316907450 Location 2400 11th Ave E Seattle, WA 98102 No violations Q' Washington State Dept of Labor & Industries. Use of this site is subject to the laws of the state of Washirgton. Help us improve https://secure.lni.wa.gov/verify/Detail.aspx?UBI=578006698&LIC=SELLEC*372ND&SAW= 12/18/2018