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SEPA EPIC-58-91 - FIRST CAPITAL PARTNERS - QUESTAR RETAINING WALL
THE QUESTAR CENTER RETAINING WALL TO REPLACE EXISITING ROCKERY 15425 53RD AVE. S0. EPIC 58 -91 CITY OF UKWILA uthcenter Boulevard, Tukwila, Washington 98 MEMORANDUM TO: FROM: DATE: SUBJECT: (206) 433 -1800 it 7/ESE /7-'Z . S .Oi' ,62F CO/24$%4Z WE-Z) Cv.P.PEN TG % 467.6-/4/0- '. -.O - v i477AC4'A' /T- C ) _vs OB. 'BENE.O /GTlJ • Cc QQ 4FAD /[E G'"/YLE 1?)1g04 q z, • 1 DiPp err. 1r�lE . MA VE- . p‘ ( :.Icy .:1?: SePki ONS . I 0 p l�tpN : �2ri1V E , / s� w . 'fl )Q0'uqtt5r; 0, p'6 Taci j .' 2-A71 .N . %i1 N6:...:. 'rte N Ta :MAI r-A nj PLUS 11411-1 11 dv 400 Cu. \cpS c• °AT 40cp cu...`(.ps Cf 'ALL — ELI I "j ..D I 111P\1 . oo c..La c- YDS AD..Dalc.I\UA L v3L-tL NK5r 516AifF'4 tuczy Prii-rEeT- -9 ,per t iN rr1On1. - II I iV Aj CpycE'PNt A.Q r CITY OF TUKWILA DEPARTMENT OF COMMUNITY DEVELOPMENT FAX NUMBER: (206) 431 -3665 TO: ` ,J� DATE: i c ( 0 nn TITLE: FROM: j COMPANY: TITLE: �U j DEPARTMENT: DEPARTMENT: _ ___DCZ — ve.&rtrt,c,;CA FAX NOS, NUMBER OF PAGES TRANSMITTED, INCL. THIS COVER SHEET: SENT BY (INITIALS) : e.,.. e,;;>; h, s. N. iv:v;: ivi i,. vi.w.v Awi W+, i+: W...v isv;,; iviviviWiviM wivei4/iiiiil,x+I+iiiiiiw4W iK•' NiI Li' %ii % %iliiii / /2. • .!. ! % % %:'ii::•ii::•:•i::. / i /'i .:..'A; .. . /// i. - .....:n .... •....... l...l.. ./..... : r,.l..l ........ ....:.. / • ...... ...........:....... ...l..xa .r../... • �xS DEPARTMENT OF COMMUNITY DEVELOPMENT c Office: f `ice: (206) 431 -3670 6300 Southcenter Boulevard, Tukwila WA 98188 06 /15 /90 SENDER: • Complete items 1 and/or 2 for additional services. • Complete items 3, and 4a & b. • Print your name and address on the reverse of this form so that we can return this card to you. • Attach this form to the front of the mailpiece; or on the back if space does not permit. • Write "Return Receipt Requested" on the mail'piece below the article number. • The Return Receipt Fee will provide you the signature of the person.delivered to and the date of delivery, _ I also wish to receive the following services (for an extri fee): 1. ❑ Addressee's Address 2.. ❑ Restricted Delivery Consult postmaster for fee.. 3. Article Addressed to: Mr. Gregory Rich First Capital Partners' First Interstate. Plaza 1201 Pacific Ave., Sufi 6"140 Tacoma, WA 98402 • Fti �y� ti 5. Signature (Addressee) r U" r1 \ ` 8:. Addressee's—Address (Only if requesti 4a. Article Number 411 tk Service Type _ ot Registered (] Insured %Certified ❑ COD ❑ Express Mail ❑ Return Receipt for'. _ M e rchandise 3 7. Date of Delivery j 6. Signature (Agent) 22 C 22 � ✓ 'r- it�� . Genes Form 3811, Nov• r 1990 *U. z j and fee is paid) d 1- DOMESTIC RETURN. RECEIF Postmark or Date ' TOTAL Postage & Fees (Return Receipt Showing to Whom, Date, & Address of Delivery 1Return Receipt Showing to Whom &.Date Delivered [Restricted Delivery Fee Special Delivery Fee • Certified Fee a, m m m P.0.,,4tete & ZIP Code Street & No. r C(3 t1 W kt`C Ave (46o m o S S t• T r TJ -.1 w Cis Cr UNITED STATES POSTAL SERVICE Official Business 1 JAN 2 2 1992 CjT•l '1 KV.ARurit you name, address and ZIP Code i PENALTY FOR PRIVATE USE, $300 PLANNiNG • CITY nr Ti f(WILA DEPT. OF (,;G1:..;,.. <, I Y DEVLLCPMENT 6300 SOUINCENTER BLVD~ IINCWILA,WA 28186 here • 't 18E uuor to -t urall-urs*.,vlq algeugooe 8141 >I38 43 pa'" )san•6a& s! ld!aaaJ wnlai 11 14381 s1.p l0 1U011 9141 uo saoeds aleudoJdde 041 u! palsanbaj S931N8S 841 Jol saw Jelu3 •g 'apple 8141 40 lual 841 uo AU3Anaa GaLolu1sau asJOpua 'eassaJppe 8141 l0 watIe pazuoglne U8 01 Jo 'eassalppe 841 01 palowsaJ Nanpap lUem noA iagwnu 84101 lue3elpe o31S311O3U .Ld1303U NIMJ.3a 813118 to wall esJOpu3 'elope to loeq 8141 0l x118 'as!M,a4IO •s4WJed a3eds 1! spua pawwn6 8141 to sueaw-6q 813!8 841 l0 lual 8141 of 1! 4oe4e pue ' 1l gE wJOJ 'pied id!a30J wn1aJ e uo ssaJppe pue aweu inoi pue Jagwnu pew pag!va3 841 alum 'ld!a3aJ uJnl8J a luem noA 4 'E .813418 8141 pew pue 'ld!a3aJ 8143 u!el8J pue 43elap 'awl) 'apple 841 to ssaJppe wniai 84110946u 8141 0l gnus pawwn6 841 lops 'pa>liew1sod ldia3aJ s!41 wem 1ou op noA '(abJe143 eixa ou) Jawe3 leino in0A of i! pia! JO mopulm a ?was a3ylo tsod ale 813!8 841 luasaid pue papep8 ld!a081 8111 bumeal ssaJppe wnlaJ 841 l0 iljbu-a4i o1 gnis pawwn6 841 lops 'paJlJewls0d 1d!a3aJ s!41 wem noA tl t 1111011 888) S33IAN3S WNOU40 0313313S ANV NO3 S3ONVN3 ONV '33311VW 03I3I11133 '3O10SOd SSV13 LSNIA N3A03 01 313110V OL SdWtl1S 39VISOd )1311S City of Tukwila 6200 Southcenter Boulevard • Tukwila, Washington 98188 John W. Rants, Mayor 20 January 1992 Mr. Gregory Rich Fist Capital Partners First Interstate Plaza 1201 Pacific Avenue, Suite 1450 Tacoma, WA 98402 RE: EPIC- 58 -92, The Questar Center Rockery Replacement Dear Gregory: The City of Tukwila SEPA Official has issued a Mitigated Determination of Nonsignificance (MDNS) for the above referenced project. Mitigation measures require a landscape plan to include hydroseed and ivy. The hydroseed is to be planted within the exposed modules. Ivy would be required along the top of the wall. The landscape plan must be submitted to and approved by the Planning Department prior to the issuance of a building permit. The building permit application has been routed to the remaining departments in the interim and will be held in the Planning Department pending submittal of the landscape plan. Please feel free to contact me at 431 -3663 if you have any questions. Sincerely, Denni Shefrin Associate Planner Encl: MDNS and Required Mitigation CC: EIPC -58 -91 File !Phone: (206) 433 -1800 • City Hall Fax (206) 433 -1833 WAC 197 -11 -970 • MITIGATED DETERMINATION OF. NONSIGNIFICANCE Description of Proposal A 15 -foot high Crib - Wall /Retaining Wall to r.epTace:an existing Rockery. The _poject would involve 400 cubic yards of cut and 400 cubic yards of import fill. Proponent First Capital Partners, LTD./ Gregory Rich Building Manager. Location of Proposal, including street address, if any 15425 53rd Avenue South. Lead Agency: City of Tukwila File No. EPIC -58 -91 ** See required Mitigation Measures Attached The lead agency for this proposal has determined that it does not have a probable significant adverse impact on the environment. An environmental impact statement (EIS) is not required under RCW 43.21C.030(2)(c). This decision was made after review of a completed environmental checklist and other information on file with the lead agency. This information is available to the public on request. There is no comment period for this DNS El This DNS is issued under 197 -11- 340(2). Comments must be submitted by . The lead agency will not act on this proposal for 15 days from the date below. ,Responsible Official Rick Beeler Position /Title Planning Director Phone 433 -1846 Address 6200 Southcenter Boulevard, Tukwila _WA- •8188 Signature r " �� You may appeal this determination to the City Clerk at City Hall, 6200 Southcenter Boulevard, Tukwila, WA 98188 no later than 10 days from the above date by written appeal stating the basis of the appeal for specific factual objections. You may be required to bear some of the expenses for an appeal. Copies of the procedures for SEPA appeals are available with the City Clerk and Planning Department. FM.DNS / • EPIC -58 -91 The Questar Center REQUIRED MITIGATION MEASURES A landscape plan shall be submitted to and approved by the Department of Community Development prior to the issuance of a building permit. Landscaping shall include the following: 1. Hydroseed 2. Ivy planted along the top of the proposed crib /retaining wall. _ FIRST _ CAPITAL, PARTNERS January 6, 1992 First Interstate Plaza 1201 Pacific Avenue, Suite 1450 Tacoma, Washington 98402 (206) 383 -7111 FAX (206) 383 -7112 Ms. Denni Shefrin Dept. of Community Development City of Tukwila 6300 Southcenter Blvd. Tukwila, WA 98188 JAN 071992 CITY Ur I oKvVILA PLANNING DEPT. Subject: The Qestar Center -15425 53rd Ave. S, Tukwila, WA- Rockery Replacement Dear Denni: Enclosed for your review please find the Geotechnical Report and related correspondence which you requested regarding the above referenced project. Let me apologize for the memos from Design Edge Services, Inc. which are hand written and difficult to read. After you have had a chance to review the enclosed information, please contact me at your earliest convenience regarding the length of time you estimate will be required to complete the review process. Given the deteriorating condition of the rockery, and its close proximity to the building, I'm sure you can appreciate our desire to get the replacement project started. Thank you once again for your cooperation. Please feel free to call me with any questions or comments. I look forward to hearing from you soon. Sincerely, First Capital Partners, Ltd. GAgory i�� Property Manager Enclosures (7) CA %t. %10 • i Creative Engineering Options INC. A firm practicing in the geosciences TRAN S M ITTAL To: Air. (!740, /1 /,j Date: C_ • �d , /9/7 Address: / ' G 6.t.(,« Project: Q__ g__6_ 2.Pi/_ P 0. goy //75 Number: 90- /044;7 r�Gt_ , 444 9".0/ Attention: Subject: WA-14U 40i/rice/la- d 7,11, t Copies Date Description 4' / 4/I.9/ keieei koc, efryiior 014 / /013 -9 J. 64,6 , . ,, , / ,., ,„ Ciii /oc4 tat& 27es. 4— / / /-- ,4 hi ,• X v/se / 'I -219W , tta, At: 4 row .. plc./ Ord For Your: 0 Distribution Remarks: t "Use ❑ Records /IA, /€' dt,;i/ 0 Review 0 Approval ❑ Information i L . 1i,e /hi a, `lir i ". .(44 Cl-le /0G,.cf From: o�e/7 AiA )7/Z. Via: • c.c. J 5418 1 59th Place NE • Redmond, WA 98052 • (206) 883 -6889 • (206) 953-1173 • FAX 867 -9664 \1)-01 cam' Esu c `? =Lsm_fm-, dy\r/vA FIRST CAPITAL PARTNERS First Interstate Plaza 1201 Pacific Avenue, Suite 1450 Tacoma, Washington 98402 (206) 383 -7111 FAX (206) 383 -7112 December 11, 1991 Ms. Denni Shefrin Dept. of Community Development City of Tukwila 6300 Southcenter Blvd. Tukwila, WA 98185 Via FAX and regular mail EdLcMI D DEC 12 MI CITY OF TUKWILA PLANNING DEPT. Subject: The Qestar Center -15425 53rd Ave. S, Tukwila, WA- Rockery Replacement Dear Denni: Thank you for the opportunity to express my concerns regarding vegetation upgrades which may be mandated by the City of Tukwila in association with the above 'referenced project. As we discussed over the phone today, I do not feel that extensive landscaping is a fair requirement for this project for the following reasons: 1. The new retaining wall will not be within view of the street because it will be located approximately 270 feet away from, and approximately twelve feet above the road which parallels the front of the building. 2. Existing trees and other vegetation, which will not be disturbed by this project, hide the wall from view on the other two sides. 3. The existing building on the lot is located approximately six feet from the wall and extends along all but a few feet of the wall, which hides virtually the entire wall from view. 4. The existing building should remain on the lot well into the foreseeable future. If the lot is redeveloped, it seems fair that a more extensive landscaping project be mandated at that time. 5. The building has no windows which face the direction of the wall so the existing tenants in the building have little opportunity to see it. This is not to say that the building's owners are unwilling to improve the appearance of those sections of the wall which are visible from the front of the building. I would suggest that ivy or other suitable, low maintenance vegetation be planted along the top of the wall at each end of the existing building. Over the near future, this vegetation will grow and cover these portions of the wall with greenery and flowers. Thank you once again fo0?our coopeatiori: Please feel free to • me with any questions or comments. I look forward to hearing from you soon. Sincerely, First Capital Partners, Ltd. Grego y Ri Property Manager First Capital Partners, Ltd. 2 FIRST CAPITAL PARTNERS • • First Interstate Plaza 1201 Pacific Avenue, Suite 1450 Tacoma, Washington 98402 (206) 383 -7111 FAX (206) 383 -7112 December 10, 1991 Ms. Denni Shefrin Dept. Of Community Development City of Tukwila 6300 Southcenter Blvd. 98188 Re: Qestar Center- 15425 53rd Ave. South Dear Denni: Enclosed for your review please find the environmental checklist which I faxed to you earlier today. I have completed this form with the help of Retaining Walls Northwest, the proposed contractor. Also enclosed is a check for the $225.00 fee. Please feel free to call me if you have any questions or comments. Thank you for your cooperation. I look forward to hearing from you soon. Sinc rely, FirsijCapital Parfiners, Ltd. rego Property Manager Enclosure PLANNING �, DEC 11 1991 CITY OF TUKWILA PLANNING DEPT. 0 Conte No. Epic File No. 58-9 • Fee-44-'00.7H Receipt No. 410 4225 ,°2 • ENVIRONMENTAL CHECKLIST A. BACKGROUND 1. Name of proposed project, if applicable: The Questar Center Retaining Walls Northwest - Contractor; Dennis Ellis- Contact. 2. Name of applicant: First Capital Partners, Ltd. /Gregory Rich - Building Manager. 3. Address and phone number of applicant and contact person: 1450 First Interstate Plaza, Tacoma, WA 98402 4. Date checklist prepared: 11/27/91 \ON \ 5. Agency requesting Checklist: City of Tukwila 6. Proposed timing or schedule (including phasing, if applicable): Jan. 1, 1992 approx. 30 days from start date to completion. 7. Do you have any plans for future additions, expansion, or further activity related to or connected with this proposal? If yes, explain. No. 8. List any environmental information you know about that has been prepared, or will be prepared, directly related to this proposal. none. 9. Do you know whether applications are pending for governmental approvals of other proposals directly affecting the property covered by your proposal? If yes, explain. None. DEC 11 1991 1 uKvVILA DEPT. 10. List any government approvals or permits that will be needed for your proposal. City of Tukwila building permit. 11. Give brief, complete description of your proposal, including the proposed uses and the size of the project and site. There are several questions later in this checklist that ask you to describe certain aspects of your proposal. You do not need to repeat those answers on this page. Section E requires a complete description of the objectives and alternatives of your proposal and should not be summarized here. Construct a wall along the north side of the Qestar Center Building, replacing the existing failed rockery. 12. Location of the proposal. Give sufficient information for a person to understand the precise location of your proposed project, including a street address, if any, and section, township, and range, if known. If a proposal would occur over a range of area, provide the range or boundaries of the site(s). Provide a legal description, site plan, vicinity map, and topographic map, if reasonably available. While you should submit any plans required by the agency, you are not required to duplicate maps or detailed plans- submitted with any permit applica- tions related to this checklist. Qestar Commerce Center, Building Number 2, 15425 53rd Ave. S., Tukwila, WA. 13. Does the proposal lie within an area designated on the City's Comprehensive Land Use Policy Plan Map as environmentally sensitive? Yes. The slope behind the existing rockery is greater than 15 %. TO BE COMPLETED BY APPLIC• • Evaluation for Agency Use Only B. ENVIRONMENTAL ELEMENTS 1. Earth a. General description of the site (circle one): Flat, rolling, hilly, steep slopes, mountainous, other Gently slopes from the building to the street. b. What is the steepest slope on the site (approximate percent slope)? Behind existing rockery approx. 30 %. c. What general types of soils are found on the site (for example, clay, sand, gravel, peat, muck)? If you know the classification of agricultural soils, specify them and note any prime farmland. Glacial Till. d. Are there surface indications or history of unstable soils in the immediate vicinity? If so, describe. No., e. Describe the purpose, type, and approximate quanti- ties of any filling or grading proposed. Indicate source of fill. Cutting the hill to allow for the installation of the retaining wall. Backfillinq with clean imported material within and behind the retaining wall. Approx. 400 cubic yards to be cut, and 400 cubic yards::of imported fill material. f. Could erosion occur as a result of clearing, construction, or use? If so, generally describe. Exposed areas will be protected during construction. The backslope will be covered with visqueen and the slope will be replanted immediately upon completion. g. About what percent of the site will be covered with impervious surfaces after project construction (for example, asphalt or buildings)? The areas covered by impervious surfaces will renin the same. Approx. 95 %. The backslope behind the wall. • Evaluation for Agency Use Only h. Proposed measures to reduce or control erosion, or other impacts to the earth, if any: Exposed areas to remain covered until revegatated. 2. Air a. What types of emissions to the air would result from the proposal (i.e., dust, automobile odors, industrial wood smoke) during construction and when the project is completed? If any, generally describe and give approximate quantities if known. During construction emissions will occur from the equipment used on site. After construction, there will be no increased emissions as'a result of construction. b. Are there any off -site sources of emissions or odor that may affect your proposal? If so, generally describe. None. c. Proposed measures to reduce or control emissions or other impacts to air, if any: None. 3. Water a. Surface: 1) Is there any surface water body on or in the immediate vicinity of the site (including year - round and seasonal streams, saltwater, lakes, ponds, wetlands)? If yes, describe type and provide names. If appropriate, state what stream or river it flows into. None. Evaluation for Agency Use Only 2) Will the project require any work over, in, or adjacent to (within 200 feet) the described waters? If yes, please describe and attach available plans. No. 3) Estimate the amount of fill and dredge material that would be placed in or removed from surface water or wetlands and indicate the area of the site that would be affected. Indicate the source of fill material. N /A.,. 4) Will the proposal require surface water withdrawals or diversions? Give general description, purpose, and approximate quan- tities, if known. No. 5) Does the proposal lie within a 100 -year floodplain? If so, note location on the site plan. No. 6) Does the proposal involve any discharges of waste materials to surface waters? If so, describe the type of waste and anticipated volume of discharge. No. • • Evaluation for Agency Use Only b. Ground: 1) Will ground water be withdrawn, or will water be discharged to ground water? Give general description, purpose, and approximate quan- tities, if known. N /A. 2) Describe waste materials that will be discharged into the ground from septic tanks or other sour- ces, if any (for example: Domestic sewage; industrial, containing the following chemicals...; agricultural; etc.) Describe the general size of the system, the number of such systems, the number of houses to be served (if applicable), or the number of animals or humans the system(s) are expected to serve. None. c. Water Runoff (including storm water): 1) Describe the source of runoff (including storm water) and method of collection and disposal, if any (include quantities, if known). Where will this water flow? Will this water flow into other waters? If so, describe. Storm water as a result of this construction will be routed to the existing catch -basin system. • • Evaluation for Agency Use Only 2) Could waste materials enter ground or surface waters? If so, generally describe. None related to construction of retaining wall. d. Proposed measures to reduce or control surface, ground, and runoff water impacts, if any: None. 4. Plants a. Check or circle types of vegetation found on the site: x deciduous tree: alder, maple, aspen, other x evergreen tree: fir, cedar, pine, other shrubs grass _ pasture crop or grain wet soil plants: cattail, buttercup, bullrush, skunk cabbage, other water plants: water lily, eelgrass, milfoil, other other types of vegetation b. What kind and amount of vegetation will be removed or altered? Some of the weeds / grasses within the area of the excavation will be removed. c. List threatened or endangered species known to be on or near the site. None. 0 Evaluation for Agency Use Only d. Proposed landscaping, use of native plants, or other measures to preserve or enhance vegetation on the site, if any: None. The affected areas will be restored to original or better:condition. 5. Animals a. Circle any birds and animals which have been observed on or near the site or are known to be on or near the site: N /A. birds: hawk, heron, eagle, songbirds, other: mammals: deer, bear, elk, beaver, other: fish: bass, salmon, trout, herring, shellfish, other: b. List any threatened or endangered species known to be on or near the site. None. c. Is the site part of a migration route? If so, explain. No. d. Proposed measures to preserve or enhance wildlife, if any: None. • 6. Energy and Natural Resources III Evaluation for Agency Use Only a. What kinds of energy (electric, natural gas, oil, wood stove, solor) will be used to meet the completed project's energy needs? Describe whether it will be used for heating, manufacturing, etc. None related to retaining wall construction. b. Would your project affect the potential use of solar energy by adjacent properties? If so, generally describe. No. c. What kinds of energy conservation features are included in the plans of this proposal? List other proposed measures to reduce or control energy impacts, if any: None. 7. Environmental Health a. Are there any environmental health hazards, including exposure to toxic chemicals, risk of fire and explosion, spill, or hazardous waste, that could occur as a result of this proposal? If so, describe. No. 1) Describe special emergency services that might be required. None. 2) Proposed measures to reduce or control environ- mental health hazards, if any: None. IIIEvaluation for Agency Use Only b. Noise 1) What types of noise exist in the area which may affect your project (for example: traffic, equipment, operation, other)? None. 2) What types and levels of noise would be created by or associated with the project on a short - term or a long -term basis (for example: traf- fic, construction, operation, other)? Indicate what hours noise would come from the site. WORR. Construction equipment and dump trucks during daylight hours Monday through Saturday. 3) Proposed measures to reduce or control noise impacts, if any: None. 8. Land and Shoreline Use a. What is the current use of the site and adjacent properties? Commercial. b. Has the site been used for agriculture? If so, describe. No. c. Describe any structures on the site. 10,000 square feet commercial office building. • Evaluation for Agency Use Only d. Will any structures be demolished? If so, what? None. e. What is the current zoning classification of the site? Commercial. f. What is the current comprehensive plan designation of the site? Commercial. g. If applicable, what is the current shoreline master program designation of the site? N /A. h. Has any part of the site been classified as an "environmentally sensitive" area? If so, specify. The backslope behind the existing rockery has been classified as environmentally sensitive because the slope is greater than 15 %. i. Approximately how many people would reside or work in the completed project? None. j. Approximately how many people would the completed project displace? None. k. Proposed measures to avoid or reduce displacement impacts, if any: None. 1. Proposed measures to ensure the proposal is com- patible with existing and projected land uses and plans, if any: To comply with the current comprehensive plan designation. • Evaluation for Agency Use Only 9. Housing a. Approximately how many units would be provided, if any? Indicate whether high, middle, or low - income housing? N /A. b. Approximately how many units, if any, would be eli- minated? Indicate whether high, middle, or low - income housing. N /A. c. Proposed measures to reduce or control housing impacts, if any: N /A. 10. Aesthetics a. What is the tallest height of any proposed structure(s), not including antennas; what is the principal exterior building material(s) proposed? Approx. 15 feet high retaining wall. b. What views in the immediate vicinity would be altered or obstructed? None. c. Proposed measures to reduce or control aesthetic impacts, if any: Planting a cascading ivy above the wall and the base of the wall. • • Evaluation for Agency Use Only 11. Light and Glare a. What type of light or glare will the proposal produce? What time of day would it mainly occur? None. b. Could light or glare from the finished project be a safety hazard or interfere with views? No. c. What existing off -site sources of light or glare may affect your proposal? None. d. Proposed measures to reduce or control light and glare impacts, if any: None. 12. Recreation a. What designed and informal recreational oppor- tunities are in the immediate vicinity? None. b. Would the proposed project displace any existing recreational uses? If so, describe. No. c. Proposed measures to reduce or control impacts on recreation, including recreation opportunities to be provided by the project or applicant, if any: None. • . Evaluation for Agency Use Only 13. Historic and Cultural Preservation a. Are there any places or objects listed on, or pro- posed for, national, state, or local preservation registers known to be on or next to the site? If so, generally describe. No. b. Generally describe any landmarks or evidence of historic, archaeological, scientific, or cultural importance known to be on or next to the site. None. c. Proposed measures to reduce or control impacts, if any: None. 14. Transportation a. Identify public streets and highways serving the site, and describe proposed accss to the existing street system. Show on site plans, if any. 53rd Ave. S. and Renton -Three Tree Pt. Rd. b. Is the site currently served by public transit? If not, what is the approximate distance to the nearest transit stop? No. c. How many parking spaces would the completed project have? How many would the project eliminate? Same as prior to construction. None will be eliminated. • • Evaluation for Agency Use Only d. Will the proposal require any new roads or streets, or improvements to existing roads or streets, not including driveways? If so, generally describe (indicate whether public or private).' No. e. Will the project use (or occur in the immediate vicinity of) water, rail, or air transportation? If so, generally describe. No. f. How many vehicular trips per day would be generated by the completed project? If known, indicate when peak volumes would occur. None. g. Proposed measures to reduce or control transpor- tation impacts, if any: None. 15. Public Services a. Would the project result in an increased need for public services (for example: fire protection, police protection, health care, schools, other)? If so, generally describe. No. b. Proposed measures to reduce or control direct impacts on public services, if any. None. • • Evaluation for Agency Use Only 16. Utilities a. Circle utilities currently available at the site: electricity, natural gas, water, refuse service, telephone, sanitary sewer, septic system, other. Electricity, water, refuse service, telephone, sanitary sewer. b. Describe the utilities that are proposed for the project, the utility providing the service, and the general construction activities on the site or in the immediate vicinity which might be needed. Existing utilities to remain. C. Signature The above answers are true and complete to the best of my knowledge. I u derstand that the lead agency is relying on them to m;ke its d- ision. Signature: Date Submitted: (V(olci( PLEASE CONTINUE TO THE NEXT PAGE. TO BE COMPLETED BY APPLICA• ` Evaluation for Agency Use Only D. SUPPLEMENTAL SHEET FOR NONPROJECT ACTIONS (do not use this sheet for project actions) Because these questions are very general, it may be helpful to read them in conjunction with the list of the elements of the environment. When answering these questions, be aware of the extent the proposal, or the types of activities likely to result from the proposal, would affect the item at a greater intensity or at a faster rate than if the proposal were not imple- mented. Respond briefly and in general terms. 1. How would the proposal be likely to increase discharge to water; emissions to air; production, storage, or release of toxic or hazardous substances; or production of noise? None related to the construction of retaining wall. Proposed measures to avoid or reduce such increases are: None. 2. How would the proposal be likely to affect plants, ani- mals, fish, or marine life? No effects. Proposed measures to protect or conserve plants, ani- mals, fish, or marine life are: None. • ` Evaluation for Agency Use Only 3. How would the proposal be likely to deplete energy or natural resources? None from the construction of retaining wall. Proposed measures to protect or conserve energy and natural resourses are: None. 4. How would the proposal be likely to use or affect environmentally sensitive areas or areas designated (or eligible or under study) for governmental protection; such as parks, wilderness, wild and scenic rivers, threatened or endangered species habitat, historic or cultural sites, wetlands, floodplains, or prime farmlands? No use or affect. The slope greater than 15% will be restored with vegetation. Proposed measures to protect such resources or to avoid or reduce impacts are: None. 5. Now would the proposal be likely to affect land and shoreline use, inclduing whether it would allow or encourage land or shoreline uses incompatible with existing plans? No affect. 411 110 Evaluation for Agency Use Only Proposed measures to avoid or reduce shoreline and land use impacts area: None. How does the proposal conform to the Tukwila Shoreline Master Plan? N /A. 6. How would the proposal be likely to increase demands on transportation or public services and utilities? No affect. Proposed measures to reduce or respond to such demand(s) are: None. 7. Identify, if possible, whether the proposal may conflict with local, state, or federal laws or requirements for the protection of the environment. No conflicts. • • Evaluation for Agency Use Only 8. Does the proposal conflict with policies of the Tukwila Comprehensive Land Use Policy Plan? If so, what poli- cies of the Plan? No. Proposed measures to avoid or reduce the conflict(s) are: None. TO BE COMPLETED BY APPLICA• . Evaluation for Agency Use Only E. SUPPLEMENTAL SHEET FOR ALL PROJECT AND NON PROJECT PROPOSALS The objectives and the alternative means of reaching the objectives for a proposal will be helpful in reviewing the aforegoing items of the Environmental Checklist. This information provides a general overall perspective of the proposed action in the context of the environmental infor- mation provided and the submitted plans, documents, suppor- tive information, studies, etc. 1. What are the objective(s) of the proposal? The objective of this proposal is to replace the rockery running.the• length of the building with a CRIBLOCK retaining wall. The existing wall is failing (see geotechnical report.) 2. What are the alternative means of accomplishing these objectives? Reinstall a rockery to replace the failing rockery. 3. Please compare the alternative means and indicate the preferred course of action: The CRIBLOCK retaining wall seemed to be. the most effictive system for the project. It allows for a structural wall to be constructed while minimizing the excavation required. Evaluation for Agency Use Only 4. Does the proposal conflict with policies of the Tukwila Comprehensive Land Use Policy Plan? If so, what poli- cies of the Plan? No. Proposed measures to avoid or reduce the conflict(s) are: None. -23- 12/10/91 12:20 FAX 206 383 7112 1ST CAPITAL FIRST CAPITAL PARTNERS NERS First Interstate Plaza 1201. Pacific Avenue, Suite 1450 Tacoma, Washington 98402 (206) 383 -7111 FAX (206) 388 -7112 • —Mina] DEC 10 1991 CITY OF TUKWILA PLANNING DEPT. 001 FACSIMILE TRANSMISSION COVER SHEET NAME: 1)14\1 Si L 6 + DATELLZ:V J FIRM: Dept of Currt ie tump/, &V la FAX TELEPHONE NUMBER: t FROM: 6112,--c:::7 a. NUMBER OF PAGES (including this cover sheet): 24 FAX TELEPHONE NUMBER: (206) 383 -7112 We are sending you the following: Letter Leases Originals Prints Submittal Contracts Attached Under Separate Cover Other For your: As Requested Review & Comment(s) Info & Use Action Required: As Indicated For Signature &Return No action Comments: • 4.�� f l �L-� �..ft �1.;:{ 1 1 ' On., 5- , 12/05/21 11 . /1.1 11. U J FIRST CAPITAL PARTNERS FAX LUU JO.) 1112 • First Interstate Plaza 1201 Pacific Avenue, Suite 1450 Tacoma, Washington 98402 (206) 383 -7111 FAX (206) 383-7112 1ST CAPITAL ij001 DEC LE MI WO - 5 1991 CITY OF TUKWILA PLANNING DEPT. FACSIMILE TRANSMISSION COYER SHEET NAME: 1 *Oe t FIRM: FAX TELEPHONE NUMBER: L4 7 1- FROM: 61 P. NUMBER OF PAGES (including this cover sheet): FAX TELEPHONE NUMBER: (206) 383 -7112 alrYtitOlk VOt-b DATE: IZ c-/I We are sending you the following: Letter Submittal Attached Leases Originals Under Separate Cover Prints Contracts Other For your: As Requested Review & Comment(s) Info & Use Action Required: As Indicated For Signature & Return No action Comments: .0 4� -mac', — (. i7 + / (vL..�� -a, 0". r CC��v � -LAC ?r1l 2RG .3p. 7112 •1ST CAPITAL, • • r : 04 '91 17:40 RWN INC. FAX 266 - 747 -5292 F•2/ A. BACKGROUND 1. The Questar Center 2. Retaining Walls Northwest - Contractor; Dennis Ellis - Contact First Capital Partners, Ltd. /Gregory Rich -- Building Manager 3. 1450 First Interstate Plaza, Tacoma, WA 98402 4. 11/27/91 5. City of Tukwila 6. January 1. 1992 approximately 30 days from start date to completion. 7. No 8. None 9. None 10. City of Tukwila building permit 11. Construct a wall along the north side of the Questar Center Building, replacing the existing failed rockery. 12. Questar Commerce Center, Building Number 2, 15425 53rd Ave. S., Tukwila, WA 13. Yes. The slope behind the existing rockery is greater than 15 %. B. ENVIRONMENTAL ELEMENTS 1. Earth a. Gently slopes: from the building to the street. b. Behind existing rockery approximately 30% c. Glacial till. d. No e. Cutting the hill to allow for the installation of the retaining wall. Backfilling with clean imported material within and behind the retaining wall. Approximately 400 cubic yards to be cut, and 400 cubic yards of imported fill material. f. Exposed areas'Will be protected during . construction. The backslope will be covered with visqueen and the slope will be replanted immediately upon completion. g. The areas covered by impervious surfaces will remain the same. Approximately 958. The backslope behind the wall. h. Exposed areas to remain covered until revegetated. 2. Air • a. During construction emissions will occur from the equipment used on site. After construction, there will be no increased emissions as a result of construction. b. None c. None 3. Water a. Surface (1) None (2) No (3) N/A (4) NO (5) No 0")11(12' ' :pT . 2nr I,y/ 7119 .UU ? ST r.a7TTa ?. m nna • -DEC 24 '91.17:41 RWNY. FAX 266 -747 -5992 (6) No b. Ground (1) N/A (2) None c. Water Runoff (including storm water) (1) Storm water as a result of this construction will be routed to the existing catch -basin system. (2) None related to construction of retaining (3) None d. None 4. Plants a. deciduous tree: alder, maple, aspen, other ever green tree: pine grass b. Some of the weeds/ grasses within the area of excavation will be removed. c. None d. None. The affected areas will be restored to original or better condition. 5. Animals a. Nth. b. None c. No d. None 6. Energy and Natural Resources a. None related to retaining wall construction. b. No c_ None 7. Environmental Health a. No (1) None (2) None b. Noise (1) None (2) Construction equipment and dump trucks during daylight hours Monday thru Saturday. (3) None 8. Land and Shoreline Use. a. Commercial b. No c. 10,000 square foot commercial office building. d. None e. Commercial f. Commercial g. N/A h. The backslope behind the existing rockery has been classified as environmentally sensitive because the slope is greater than 15$. i. None j. None k. None 1. To comply with the current comprehensive plan designation. wall. 1/05 /F. 11;94. FAI 205 ;.V33 7112. 1ST r! IT L E0 • -DEC 04 '91 17:41 RWN INC. FAX 206-74? -5092 • P.4"5 9. Housing a. N/A b. N/A c. N/A 10. Aesthetics a. Approximately 15 feet high retaining wall. b. None c. Planting a cascading ivy above the wall and at the base of the wall. 11. Light and Glare a. None b. No c. None d. None 12. Recreation a. None b. No c. None 13. Historic and Cultural Preservation a. No b. None c. None 14. Transportation a. 53rd Ave S. and Renton -Three Tree Pt. Rd. b. No c. Same as prior to construction. None will be eliminated. d. No e. No f. None g. None 15. Public Services a. No b. None 16. Utilities a. electricity, water, refuse service, telephone, sanitary sewer. b. EXisting utilities to remain. C. SIGNATURE The above answers are true and complete to the best of my knowledge. 1 understand that the lead agency is relying on them to make its decision. Signature: wall. Date Submitted: D. SUPPLEMENTAL SHEET FOR NONPROJECT ACTIONS 1. 2. a. None related to the construction of retaining b. None a- No affects 12!05/2.1. 11:06 FArI 285 363. 7112 • • **DEC 04 '91 17:42 RWN INC. FAX 0E- 747 -5892 3. b. None ISI Cq?IT17 a. None from the construction of retaining wall. b. None 4 a. No use or affect. The slope greater then 15% will be restored with vegetation. b. None 5. 6. 7. 8. a. No affect b. None c_ N/A a. No affect b. None a. No conflicts a. No b. None E. SUPPLEMENTAL SKEET FOR ALL PROJECT AND NONFROJECT PROPOSALS 1. The objective of this proposal is to replace the rockery running the length of the building with a CRIBLOCK retaining wall. The existing wall is failing (see geotechnical report). 2. Reinstall a rockery to replace the failing rockery. 3. The CR /BLOCK retaining wall seemed to be the most effective system for the project. It allows for a structural wall to be constructed while minimizing the excavation required. 4. a. No b. Note l'aM°01 I.G• • • Creative Engineering Options INC. Geotechnical Engineers, Geologists & Environmental Scientists November 4, 1991 90 -1023 Mr. Dennis Ellis Retaining Walls Northwest 1299 - 152nd Avenue N.E. Bellevue, Washington 98007 Subject: Revised Crib Lock Wall Design Parameters Questar Center Rock Wall Replacement Tukwila, Washington Reference: 1. Design Edge Services, Inc., memo regarding criblock retaining wall design criteria, dated 8/21/91. 2. Creative Engineering Options, Inc., letter regarding Criblock Wall Design Parameters, dated October 23, 1991. 3. Design Edge Services, Inc., memo regarding modified criblock retaining wall design criteria, dated 10/30/91. Dear Dennis: As requested, I have reviewed the geotechnical aspects of the modified criblock retaining wall design summarized on the referenced Design Edge Services memo (reference 3) for the subject project. These modifications are based on our comments (reference 2) derived from a review of the original memo, reference 1. My comments and conclusions are presented below. It is clear from this modified series of wall design criteria that the potential surface vehicle load surcharge has been accommodated into the original design. I had already assumed that the slope surcharge was included in the original design. The data on the Preliminary Design Table indicates that the factors of safety are all in excess of 1.93. Further, according to this table, with three minor exceptions, the toe and heel pressures are all within the allowable soil bearing pressure of the supporting site soil and, as such, are acceptable. 5418 159th Place NE • Redmond, WA 98052 • (206) 883 -6889 (206) 953 -1173 • FAX 881 -3592 • • Geotechnical Consultation Services 90 -1081 Questar Center - Criblock Wall November 4, 1991 Page 2 The minor exceptions occur where the wall height is fifteen (15) feet, or more. Here, the toe pressures presented on the table are 3,427 and 3052 psf. In addition, at the highest wall section, there is apparently a heel pressure of 3068 psf. As indicated in reference 2, considering that the real in -situ bearing pressure provided by the site soil is significantly greater than three thousand (3,000) psf, we do not see this as detrimental to the wall design or its long term integrity. However, we do recommend that the wall subgrade in the area of the tallest section be examined when exposed to verify that adequate bearing is available. If the soil appears to be soft or unstable, we will provide geotechnical recommendations for remedial treatment at that time. We appreciate the opportunity to be of continued services on this project and for the opportunity to review the modified criblock wall design criteria for this project. As indicated in reference 2, our comments and conclusions have been derived in a manner consistent with that level of skill, care and competence ordinarily exercised by other members of the profession in good standing currently practicing under similar conditions in this area. No other warranty, express or implied, is made. Should you have any questions about any point raised in this letter, or about any other geotechnical aspect of the project, please call. Very truly yours, CREATIVE ENGINEERING OPTIONS, INC. Glen ann, P.E. President C.C. . gm/questar2/eb1 Mr. Greg Rich; Pacific Cities 15 27 RAN I AY. 20E- 747 -5892 • f Design Ed2o Services, Inc. 4620 S.E. Belmont /$u;ta 330 Portland, Orggon 97215 4503).238-M2 DATE: 'Cf191 P. 5/6 FACU Lti ie Teens) m l s9 i on Cover Sheet TO : ��tr.v w, a,u..a • Qe1t?N I,iFE7 "De rtN4= Tir r`,.Ij FP M: P1 .7FC? Cpw. E Z. :;p ttalr.. FAX N0. Zf? 9( c:UNCERNT140: 'iell-,._ i r I.l "v vt 3 t<4 c11-01 ' >n rt Ll Payeti to tallow enver 1r'eny.pageth were riot received!i,r there are any questions, ple1Qo Indicate voice response or cal); as coon as FoAsiblior. Commcnte: • ■ . S....: rtri t .,. , } I • �s roy k44es4t.a1 L'y� >1eh met m . t?r )4.45/9 1' I 1-1% y- kt . 11eut r�?v.Ie vt of 11 IL.- X1``1) Jestri mi qt,, ti `i elt44. 4 I 2t -�tr rjL'icn}glc t t i w ich 8 0kt C.,(1 -1%31\ 1 i-ho ft° T.,p. fltINT-071 /.4, �t,l•I /Ftn il !1 , 1 jj ggl.e (ptyt7h Mn,,, .J,4 _) 4111Y' 40 art t. 14 4..g4l41,,kc my chi +e AI,. 5171 �vti rdcr)4 0.94c •11N 11'11> p 1rt c 1 . *s • 1,L P ( 1 r. �•te t� if rd t e� 1,-71 7 lic rot Ne Al In- vt • co 1 j `S. Q C l.a )rite, ', 4 t 44 exr +aY 0� �he bk40( Rch , esign Mdp_geVviceg,' Inc, Signee otJvlse: JAN 06 '92 15:27 RWN INIIVAX 206- 747 -5892 C,dut:; T' t_ • 1'1 Ff ! H i. 1{ 3 F50 _ .s SP, $f , 2.l6 2.60 ,22248 4 s2 id 71 :s' :1.82 1,43 .2841 688 0 3 - 9.72. :?,/c, Li'tl [. /778 IZ y 12 3.3.7 2. i, ,2124 i44q _,. 14 2-73 R. 6o .;eifit r 75t2 f1s' IS 2.44 4J 11 4 771 1sB3 115' . 1 3,aqo� .280 115 - 3 1� 324 �s $40 3,6f 2135 3263 .21oss 4t P.6/6 • • Creative Engineering Options INC. Geotechnical Engineers, Geologists & Environmental Scientists October 23, 1991 90 -1023 Mr. Dennis Ellis Retaining Walls Northwest 1299 - 152nd Avenue N.E. Bellevue, Washington 98007 Subject: Crib Lock Wall Design Parameters Questar Center Rock Wall Replacement Tukwila, Washington Reference: 1. Design Edge Services, Inc., memo regarding criblock retaining wall design criteria, dated 8/21/91. Dear Dennis: As requested, I have reviewed the geotechnical aspects of the criblock retaining wall design summarized on the referenced Design Edge Services memo for the subject project. My comments and conclusions are presented below. From the information presented on the Preliminary Criblock Retaining Wall Design Criteria sheet the values used appear to be generally conservative and in general accord with our earlier oral recommendations. The equivalent fluid pressure is omitted but, given the phi angle of 30°, this should be on the order of forty (40) pcf. Since there is a short slope above the top of the wall, and considering that there is a paved parking lot atop the slope, we also suggest that you include a surcharge loading to accommodate these conditions. In our professional opinion, a surcharge of fifty (50) psf acting over the full wall height should be adequate. The data on the Preliminary Design Tib1e indicates that the factors of safety are all in excess of 1.99. Further, according to this table, with one minor exception the toe and heel pressures are all within the allowable soil bearing pressure of the supporting site soil and, as such, are acceptable. The minor exception is for a toe pressure of 3,006 psf. Considering that the real bearing pressure in the site soil is significantly greater than three thousand (3,000) psf, we do not see this as detrimental to the wall design or its long term integrity. 5418 159th Place NE • Redmond, WA 98052 • (206) 883 -6889 • (206) 953 -1173 • FAX 881 -3592 • Geotechnical Consultation Services 90 -1081 Questar Center - Crbblock Wall October 23, 1991 Page 2 The sketch provided on the Design Criteria sheet indicates that the drainage system is to be "by others ". While general recommendations were provided orally, it is clearly the responsibility of the contractor to install the drainage system and, as such, it must be part of the design. We appreciate the opportunity to review the criblock wall design criteria for this project. Our comments and conclusions have been derived in a manner consistent with that level of skill, care and competence ordinarily exercised by other members of the profession in good standing currently practicing under similar conditions in this area. No other warranty, express or implied, is made. Should you have any questions about any point raised in this letter, or about any other geotechnical aspect of the project, please call. Very truly yours, CREATIVE ENGINEERING OPTIONS, INC. M�- Glen Mann, P.E. President C.C. . gm/questar /ebl Mr. Greg Rich; Pacific Cities JAN rti6 '92 15: ',2f RWN IN AX 21 6- 747 -5E �' h. A. 44.1:'--1. DATE: cy/t-. /9( EDGE : Design Edge Services, Inc, 4520 S.E, Belmont /Suite 330 Portland, Oregon 97215 ICE fp.2 /6P 6 i Facsimile Transmission Cover Sheet TO: )4H{ >4.L�S r.>„ FROM: 1EN.. k A PROJECT: ,(Ax f (503) 238-111Z FAX NO. s-rAx �,, ' #'l0 , *c.gf CONCERNING: --1 T:..cm{1•.), m7�' {,, Pages to follow cover sheet:_.' if any pages were not received or there are any questions, ple4se indicate voice response or call as soon as possible. Comments 'Den 4/1/e C ltU. CDP 35PJ.te... ble7 R r e /1 e. Sam is E Ihder re t/NE'0./ q al je: lvr� rltti e yl rAr bd ial 1'7 11 ,nriti C( /Viet Q Q,!ks a wiigR pp WOaI.4F lha l Design Edge Services, inc. Signed )ATE JAN 06 ' 92 15: 25 RWN II■lerAR 20g-74?-589-2 1 E' •D. a E Y C E S P . 2i6' - =' PRELIMINARY CRIBLOCR RETAINING NALL DESIGN CRITERIA >ROJECT NAME r litE CEI• 1E R PROJECT NUMBER 2/ v 3. P1 jz0+ ;OIL DENSITY ;OIL INTERNAL ANGLE OF FRICTION ;QUIVALENT FLUID PRESSURE ,LLOWABLE SOIL BEAR/NC PRESSURE 3ETHOD OF ANALYSIS 30° 3000 CouLevwl8 This is a preliminary analysis and is not to be used for construction. This analysis includes retaining wall stability only, it does not consider stability of the soil beyond the interface of the soil and the wall. The above criteria and loading conditions are to be verified by a professional Soils Consultant. Results of this review to be delivered to Design Edge Services, Inc., prior to release for construction. d f' u 2J L pkAwAGE SySTGwl jiATIVE L.NDISTURBEp Sof `' _ JAN' BE ' 92 15 2E KWN If.—AT‹ 2-74-82 EDGE: V ICES F Np,4 /E' - 0 DATE PROJECT NAMELLKSTAit GgQTER PROJECT NUMBER_ The following ate preliatinary vall conffg rations and are to be iced for construction. 3' 14' 1,47q 2.31 Z7 So 70r X 16 2.1.3 3°404 "3 3, -2- 3,70 2,x02 3, to 3.31 1417 2413 • Creative Engineering Options INC. Geotechnical Engineers, Geologists & Environmental Scientists April 12, 1991 90 -1081 Mr. Greg Rich Pacific Cities P.O.Box 1193 Tacoma, Washington 98401 Subject: Rockery Condition Questar Commerce Center Building Number 2 Tukwila, Washington Reference: CEO Inc., Letter regarding Rockery Construction Guidelines, dated July 24, 1990. Dear Mr. Rich: As requested we have re- visited the subject site to evaluate the potential need for immediate rockery replacement. We visually examined the rockery along the west side of the site specifically noting the degree of visible damage or deterioration. Our comments and conclusions are presented below. From our visual examination of this rockery it is clear that the structure is currently subject to ongoing distortion from tree growth through the rockery face. This has resulted in lateral displacement of several rocks. What is unclear is the degree of destabilization that has occurred. In our professional opinion, this displacement is sufficient to be of concern and poses a potential threat to the building. Should this part of the rockery fail, it will almost certainly damage the building wall. We also noted some displacement of several rocks at the base of the highest part of the rockery in the southwest corner of the site. Apparently, these rocks have been moved laterally since construction. This movement has left a void behind the rocks. Because of the height of the wall, we estimate about fifteen (15) feet high, we believe this too is a dangerous situation that, should the wall fail, could also lead to building damage. 5418 159th Place NE • Redmond, WA 98052 • (206) 883 -6889 • (206) 953 -1173 • FAX 881 -3592 • • • Geotechnical Consultation Services 90 -1081 Questar Commerce Center Rockery April 12, 1991 Page 2 In addition, we noted that several individual rocks within the rockery structure are in the process of deteriorating. In time, these rocks will decay into a soil -like material and will lost their ability to support load. In this event, which may take several years, portions of the rockery may well collapse. In summary, there is in our opinion sufficient reason to be concerned about the stability and structural integrity of this rockery in the immediate future. While it is possible that, in spite of the visible distortion and deterioration, this rockery may last for several years in its present condition, it is equally likely that it will not. If it were to collapse or suffer localized failures there is a strong likelihood that as a result there will be damage to the building. It is also possible that such failure might also injure a passer by. We trust that this clarifies the situation for you regarding the need for rockery reconstruction. Should you have any questions about any point in this letter, or any other geotechnical aspect of the project, please call. Very truly yours, CREATIVE ENGINEERING OPTIONS, INC. Glen Mann, P.E. President gm/questar/b 10 • • July 24, 1990 90 -1081 Capital Consultants Capital Center 2300 S.W. First Avenue Portland, Oregon 97201 Attention: Subject: Reference: Ms. Karen I. Blomquist Rockery Construction. Guidelines Questar Commerce Center Building Number 2 Tukwila, Washington Plot Plan and Legal Description for Questar Commerce Center, Building No. 2 undated, provided by NDT Engineering Corp. Seattle, Washington. Dear Ms. Blomquist: Introduction As requested, this letter provides our recommendations and construction guidelines for a replacement rockery along the west side of the subject site in Tukwila, Washington. We understand that you are concerned because the existing rockery is suffering some minor distress due to tree growth, and also that there is little space currently available between the existing building and the rockery. We also understand that there are several potential rockery construction options being considered regarding the space between the rockery and the building. We are proceeding with our services on the basis of your written of July 17, 1990 authorization. Project Description From our discussions, we understand you wish to remove an existing rockery which was constructed along the west side of the subject site about four to five feet away from the existing building's wall. This rockery is currently suffering some minor distress because of recent • • Geotechnical Consultation Services 90 -1081 Questar Commerce Center - Building 2 Rockery July 24, 1990 Page 2 tree growth which is occurring through and within the rockery structure. Once the existing rockery has been removed, you wish to replace it with another. You are also considering several options that will reduce the somewhat claustrophobic feeling that exists between the existing rockery and building and, if possible, you wish to increase the space between the rockery and building. You would like to create sufficient space to allow for truck loading /unloading. The height of the existing rockery varies between approximately twelve (12) feet at the south end to seven feet at the north end. There is an approximately 2:1 (horizontal:vertical) slope above the rockery which extends to the property line. The rockery is approximately one hundred and twenty (120) feet long in a south to north direction. This structure also connects to another rockery extending onto adjacent property to the south. Development Options As indicated above, you are considering three rockery options for this space. According to the referenced Plot Plan, there is about twenty - three (23) feet between the building and the property line in which to reconstruct the rockery or build a new system. The potential options currently under consideration are: 1. Remove and replace the existing rockery with a similar rockery construction in the same location, 2. Remove and replace the existing rockery with a two stage rockery to create a more open area next to the building, or 3. Remove the existing rockery, excavate back toward the property line and build a new single stage rockery to create a load /unload area. On the basis of the space available (twenty -three [23] feet) and the approximate height of the ultimate excavation (about fourteen [14] to nineteen [19] feet) there does appear to be sufficient space to either reconstruct the existing rockery or to overexcavate and construct a new single stage rockery. Geotechnical Consultation Services 90 -1081 Questar Commerce Center - Building 2 Rockery July 24, 1990 Page 3 Staged rockery construction requires that the lower section be at least half the total rockery height and that there be a setback between the rear of the lower stage and the face of the upper stage equal to, or greater than, the height of the lower stage. Because the overall rockery height will increase by about seven feet, even if the rockery is begun in the same location as the existing rockery, there is insufficient space available to construct a two stage rockery. In the case of the third option, there will need to be an over - excavation and removal of about ten (10) to fourteen (14) feet of material to provide the requisite load /unload space and space for rockery construction. By setting this rockery back towards the property line, the height will be increased by up to approximately five feet. This will result in rockery construction on the order of between about seventeen (17) and twelve (12) feet in height at the south and north ends, respectively. This rockery too will be approximately one hundred and twenty (120) feet long. In each case, the new construction must be keyed into an existing rockery at the south end of the site. This rockery is on the order of fourteen (14) feet high. The City of Tukwila has requested that you provide a letter from a registered geotechnicai engineer substantiating the means of construction and the rockery's post construction integrity. Rockery Construction General You should be aware that a rockery is not considered a retaining structure in the way one would consider a reinforced concrete retaining wall. The primary function of a rockery is to protect the soil face in front of which it is constructed against the elements and to help reduce the potential for erosion. A rockery will not restrain hydrostatic pressures from excessive drainage or water flow behind the rocks. Rockery construction is a craft that is highly dependant on the contractor's experience, capabilities and equipment. Because of this, and considering each rock used has a different shape and "fit" to its neighbor, it is virtually impossible to "design" a rockery. However, providing your contractor adheres to the recommendations contained in this letter and the Associated Rockery Contractors (ARC) Standard Geotechnical Consultation Services 90 -1081 .Questar Commerce Center - Building 2 Rockery July 24, 1990 Page 4 . Rockery Construction Guidelines, by virtue of the mass of the rock used and its mechanically interlocking nature, some undetermined degree of gravity retention is achieved. Hence, the larger the rock used the greater the in -place mass and therefore the greater degree of retention that will exist. In our experience, it has been proven that sound construction practice typically results in the production of a competent and long lasting rockery. To help achieve this goal, we recommend the ARC Standard Rockery Construction Guidelines be closely adhered to during construction. A copy of these guidelines is attached for your information and use. If there should be a conflict between the recommendations in the guideline and this letter, this letter will govern. We have also provided a pictorial representation of the rockery's approximate location as Sheet 1 of 3. A sectional view of the higher section of the replacement rockery is provided on Sheet 2 of 3, and the set -back rockery on Sheet 3 of 3. These sketches are attached for your, and your contractor's, information and use. Keyway Once the appropriate excavation has been completed into the soil face to be protected, your contractor must provide an adequate keyway for the rockery. The keyway should extend at least twelve (12) inches down into the underlying competent native soil. It should be wide enough to place the basal rock and the filter drain rock layer, typically a distance of about five to six feet. The surface should slope very gently back to the rear of the keyway where a perforated or slotted drain line should be installed. The keyway subgrade should be proofrolled to tighten up the exposed surface. A walk- behind, twin vibrating drum steel wheel roller is adequate for this purpose. Such a roller can be found at most local rental stores. Any soft or potentially unstable areas should either be overexcavated and replaced with a compacted structural fill (described later in this letter) or, the area should be overlain with a layer of about ten (10) to twelve (12) inches, or more, of quarry spalls (two to four inch size). The spalls should then be tamped firmly into the subgrade to tighten it sufficiently to support the rockery load. • • Geotechnical Consultation Services 90 -1081 Questar Commerce Center - Building 2 Rockery July 24, 1990 Basal Rocks Page 5 Once the keyway has been prepared, the basal row of rock should be firmly tamped into place. Because of the nature of this site, and given the height of the rockery, we recommend that the basal row of rock consist of six -man size rocks only. As each rock is placed onto the keyway subgrade it should be tamped with the rock placement crane to firmly seat it into the underlying subgrade soil. Each rock should be placed in a manner that will achieve the best rock -to -rock fit and leave as little interstitial void space as possible. Rockery Construction Once the basal row of rock has been placed under either option, the construction of the rockery wall can continue. We recommend that for option 1 six -man size rock be used in the lower one third of the rockery, we estimate at least one to two rows from the keyway subgrade. Above this point, there should be one row of five man rock then the remainder should be of no less than four man -sized rock. For option 3, we recommend approximately the lower one half be of six - man sized rocks, an estimated three rows of rock. Above this should be one row of five -man rock with the remainder of four -man rock. All rockery rock should be placed so that the larger rocks are towards the base of the rockery and the smaller rocks towards the top. Wherever possible, the rocks should be placed with the longest rock dimension set back towards the soil face being protected. This will result in less face area of rock being presented, but a more structurally competent wall. It is also important that the rocks be placed in such a manner as to achieve the closest possible rock -to- rock contact both vertically and horizontally, and to leave as little void space as possible. Face Batter We recommend that the inclination, or batter, of the face of the rockery be set at 1:5 (horizontal:vertical). This should provide a clean, stable, and structurally sound rockery face. By generating a slightly flatter face it should also be possible to reduce the "chasmlike" effect next to the building and make the space lighter. • • Geotechnical Consultation Services 90 -1081 Questar Commerce Center - Building 2 Rockery July 24, 1990 Filter Rock Layer Page 6 As the rockery is raised, a layer of crushed filter rock must be placed between the rear face of the rocks and the soil face being protected. This rock should be about two to four inch sized crushed rock and should be soil free. As it is placed behind the rock, it should be tamped with the crane bucket to achieve as tight a fit as possible. The filter layer is raised contiguously with the rockery. The surface of the filter layer should be covered with an impermeable layer, such as visqueen, filter fabric or building paper. We recommend you backfill over this with a compacted impermeable soil fill in which a new vegetative cover can be grown. This will prevent surface water from seeping through into the rockery's filter layer. For this rockery we recommend that the filter rock layer be no less than eighteen (18) inches thick. Soil Slopes While it is preferable to have an essentially level soil surface above a rockery, in this case there will be a slope between the top -of- rockery and the property line. We, therefore, recommend that any sloping soil surface above a rockery be kept to a gradient of 2H:1V, or flatter. Achievement of this slope gradient will probably govern the actual maximum height of the rockery. A surface with this slope can be easily constructed or, in the case or an existing native slope, can be easily recompacted to provide a competent surface. We also recommend that any soil surface above a rockery be seeded with a rapid growth, deep rooted vegetative mat as quickly after construction is completed as possible. This will tend to help reduce the potential for surface erosion, the rate of surface water infiltration and raindrop impact. You may also wish to use a pegged in -place jute matting, or other geotechnical fabric, to help maintain the seed and mulch in -place until the root mat has had an opportunity to germinate and take hold. Precautionary Measures As indicated above, a rockery is not a retaining wall. It is more susceptible to damage from exterior causes than, for example, one would expect a reinforced concrete wail to be. Therefore, to achieve a stable and long lasting rockery structure we recommend that certain Geotechnical Consultation Services 90 -1081 Questar Commerce Center - Building 2 Rockery July 24, 1990 Page 7 practices be totally avoided once the rockery is complete. Wherever possible, excavation work should be performed before the rockery reconstruction gets underway. We recommend that no excavation be performed within five feet of the top of any rockery. This will help prevent the potential for collapse back into the excavation area of the upper rockery rocks should soil support be removed. More importantly, no excavation work should be conducted between the toe of the rockery and the existing building, nor should any excavation penetrate into an area defined by a 1H:1V line extended down from the front edge of the basal rock of the rockery. This will help prevent the possibility of undermining any rock and thus eliminating some portion of the rockery's foundation support. Drainage As indicated earlier, a perforated or slotted drain line is placed at the back edge of the keyway to collect any keyway subgrade seepage or surface water flow that filters down through the filter rock layer. The pipe should have a minimum diameter of four inches, be bedded on a free - draining material (such as coarse sand or pea - gravel) with the perforations or slots facing down. It should be tightiined to a positive and permanent discharge, such as a nearby storm drain. Use of Fabric There are wide variations of opinion regarding the use of fabric in rockery construction to "prevent" fines being flushed from the protected soil face out through the rock filter layer. In our opinion, and after detailed discussions with several fabric manufacturers representatives, fabric should not be used in rockery 'construction of this nature. For a geotechnical drainage fabric to function as designed. the manufacturer recommends that the interface between the soil face, fabric and backfill (the rockery filter rock in this case) should he such that.the fabric is very tightly sandwiched between the soil and backfill. This sandwiching effect keeps the filter cloth flat and in close contact with the surrounding soil which is what prevents soil particles from moving. • • Geotechnical Consultation Services 90 -1081 Questar Commerce Center - Building 2 Rockery July 24, 1990 .Page 8 Unfortunately, it is difficult, if not impossible, to achieve this form of contact in rockery construction. As a result, it is often possible for soil particles to be flushed from the face of the soil into the fabric. Over time, and this is often a short period, large portions of the fabric become clogged and this, coupled with subsurface seepage, can lead to buildup of hydrostatic pressure behind the rockery. Naturally, the rockery cannot withstand such pressures, and it moves and /or fails. In our opinion, this scenario can generally be avoided if the filter rock material is placed carefully so that the soil face is suitably protected. Construction Monitoring Because rockery construction is a craft, and one that it is so heavily dependant on the contractors staff and equipment, it is imperative that the construction process be monitored periodically throughout. By so doing, it is possible for us to verify that the recommendations contained in this letter and the ARC Standard Guidelines are being followed, that the rock is suitable, and the construction procedures appropriate. It also provides an opportunity to make modifications to the recommendations in the field should unexpected conditions be encountered. This avoids hindering the schedule and helps keep the project within budget. Your contractor has indicated that he expects the rockery construction to take approximately seven to ten working days to complete. Based on this schedule, we estimate that a visit of relatively short duration should be made every other day. This should result in about three to four visits to the site. At each visit a Rockery Examination Record sheet will be completed summarizing the progress and the quality and form of construction. Following completion of the rockery, a written summary report will be provided to you and the 'City of Tukwila. Copies of the Rockery Examination Records will be attached for your information. Closure The. recommendations contained in this letter pertain to the subject rockery and are for the exclusive use of Capital Consultants and their other consultants only. The recommendations have been made in a manner - consistent with that level of care and skill ordinarily Geotechnical Consultation Services 90 -1081 Questar Commerce Center - Building 2 Rockery July 24, 1990 Page 9 exercised by other members of the profession currently practicing under similar conditions in this area. No other warranty is expressed or implied. Providing the recommendations contained in this letter and the ARC Standard Guidelines are closely followed during construction, and the construction process is monitored, the completed rockery should function as required for the lifetime of the project. We trust this information is sufficient to allow you to proceed with construction. Should you have any questions about any point in this letter or the ARC Guidelines, please call. Very truly yours, CREATIVE ENGINEERING OPTIONS, INC. Glen Mann, P.E. President C.C. Attachment: gm Ms. Melisse Dynan; Pacific Cities ARC Standard Rockery Construction Guidelines Sheet 1 of 3, Rockery Location Sketch Sheet 2 of 3, Option 1 Rockery - Section Sheet 3 of 3, Option 3 Rockery - Section 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 40 41 42 43 44 45 Creative. Engineering Options INC. Geote hnical Engineers. Geologists & Environmental Scientists PROJECT exest'or Wag iZockery SUBJECT Rocker l-oc.ovfion Ske'hah PROJECT NO. 90 -10131 SHEET 1 OF g COMPUTED BY (SV► DATED '424190 CHECKED BY DATED 1111111111111111111110MMT1 D MEMEIFICIIMMV11 81111% ■ ■■ 1111■■ 1111■■ ■ 1111■ i■n■ ■■■■■ ■■■■r. ■�1■■■ ■■■■ 1111■■ ■ ■■■■ 11i1■11■ •■■ ■■■c ■ i�■■iri■ ■■■■ ■■■ Mai-L I�ita�■ h ■ ■■■ ■ /1I■ ■■■ ■ ■ ■.f/!!!' 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P' CA Visio GAO Geotechnical Engineers. Geologists & Environmental Scientists PROJECT QNes+Pt '6149,2 - 'Rockery SUBJECT 0riioh 3 2ockerl — SechiolA PROJECT NO. 90-10C SHEET 3 OF 3 COMPUTED BY 6M DATED 1'I2f /7o CHECKED BY DATED EE EE E EEEEEEEEEEEEEEihEEEEEEEEEEEEEEE EEEEE EEEEE EEEEE mmm®irmom maim m'" mmum 1EEE aaaaa EEEE EEU Ml ■ rilr ► ■ EEEE ■aaaaaaaazavaaEar EE EEE EEEmw i ®3hl hh■ EE EEEE EEEEE EEEE EEEXa nMEE EEEEE EEEE Er umEEE EE EE /I�uEEEE ■ .. MMEENSIIMMOMMIMMMENWAMMUMMINEMMEMMINIO IIMMIIIIIMMIUMMUMMOTAMWNIMMMIN2111111111111111111 11111 EEEEE ■ E1MI'/: UEN UMh=L 1�RMSO 111 ■E EE EEEEE ■ ■EE E' !'_� >�:E �iii/E ■ EEM 11111 EEEEEEEEEEE Eaur:/ci E;�d�MEEEEEEr�EEEEE EEE EE EMMIIM EEE SEEM �U . 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NOT 10 $CAL. ft-ANT INb' bT RIP . LANDSCAPE SalE04LE .. ep/ y II 2a211. 9uANr S�2E 7 0 $ 0 8 :. .. ®. :. co ' ar.urki or/ 1GAL (60• O.C. Tap oFwxill) d,00ps1,it Sucv Le..) Grow ,Hydro:Mead' 100 11880 Aee. SE Salto #102 Bellevue. NA 88004 (208/408-8 44, EUGENE RE 8 LS 2690 LAN1),CAPING PLAN ' PK@ARfc, Taq: I?O�get, Ai 49 Al w \ M • • Fes' P�cA}cipi 4 O ty, (' 1 JOB #Q .II0.1- OCl1 l e74< REVISw08 ' DRAW# J CHECKED Ch. ` DATE 1I1121°11