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HomeMy WebLinkAboutSEPA E96-0020 - CITY OF TUKWILA / PUBLIC WORKS - GILLIAM CREEK DRAINAGE IMPROVEMENTSGILLIAM CREEK DRAINAGE IMPROVEMENTS STORM DETENTION PONDS & WATER QUALITY IMPROVEMENTS 42ND AVE. S. & SR -518 E96-0020 AFFIDAVIT OF DISTRIBUTION I, MiLVIA WAAW_1.-E/v hereby declare that: LI Notice of Public Hearing O Notice of Public Meeting O Board of Adjustment Agenda Packet [Board of Appeals Agenda Packet JJ Planning Commission Agenda Packet 0 Short Subdivision Agenda Packet LI Notice of Application for Shoreline Management Permit 0 Shoreline Management Permit flDetermination of Non- significance YMitigated Determination of Nonsignificance Determination of Significance and Scoping Notice ONotice of Action Official Notice Other Other was mailed to each of the following addresses on 1-2(0- 9 . �S�+E a /-� I ACNr�� r•IT� /� � 'nn c/�n Name of Project&IWAM ( �i� 1)P-kI J gnature SIFc, v ' ` I rllilk ., I mp rev` File Number 10 -00Z© '� 6300 Southcenter Boulevard t9o8 Tukwila, WA 98188-2599 • WASHINGTON STATE DEPT OF FISHERIES & WILDLIFE 16018 MILL CREEK BLVD MILL CREEK, WA 98012 a u, 0, --cuuck,31u.A pu.p"L Wo0.-tS lQ3O 2 So u -n-1 C - 3 L - S ( or, .;.•da:�r..:.+..:A.:.vae.cl,.iecm�u.:h'.s:ia+�?.wM.7.n�..\:A,wn.r.i�'Y•?4�rZ':u':�•Strs�yet-a.�..:.:_.•et:�G'-•�-..•i�•'r::c$:I,wSuerriy City of Tukwila Department of Community Development 6300 Southcenter Boulevard Tukwila, WA 98188-2599 e'j\ 1 n1►=o 2 MxT1oc CTE► . KING COUNTY DEPARTMENT OF DEVELOPMENT 3600 - 136th Place SE Bellevue, WA 98006-1400 . • CITY OF TUKWILA 6200 SOUTHCENTER BLVD. TUKWILA, WA 98188-2599 (206) 433-1800 TO: DEPARTMENT OF ECOLOGY SEPA REVIEW SECTION PO'BOX 47703 OLYMPIA, WA 98504-7703 • AFFIDAVIT • OF DISTRIBUTION 1, Sy I. -v i A NIAttu ll -I- -t hereby declare that: O Notice of Public Hearing fl Notice of Public Meeting L Board of Adjustment Agenda Packet LI Board of Appeals Agenda Packet O Planning Commission Agenda Packet fj Short Subdivision Agenda Packet O Notice of Application for Shoreline Management Permit f Shoreline Management Permit fJDetermination of Non- significance plitigated Determination of Nonsignificance O Determination of Significance and Scoping Notice Notice of Action fl Official Notice 0 Other 0 Other was salaed to each of the following FAX E� I-1 N T A Qkvz I ►J s1A11VI T►MES IA(y- z2 - addresses on Name of Project%fI"I-IRAA CV26e, u 2AINA1 ignature .,c,-- File Number F.-9(49 - C)002-C)I AAP pcSYEn1Ts 411 CITY OF TUKWILA MITIGATED DETERMINATION OF NONSIGNIFICANCE (MDNS) DESCRIPTION OF PROPOSAL: RESTORE DAMS TO CREATE STORM DETENTION POND'S, PIPE RUFF FROM 42ND AVE THROUGH BIOSWALE, THEN INTO PC*D'S, INSTALL TRAIL LINKS PROPONENT: ENT: CITY OF TUKWILA PUBLIC WORKS LOCATION OF PROPOSAL, INCLUDING STREET ADDRESS, IF ANY: ADDRESS: PARCEL NO: SEC/TWN/RNG: GILLIAM CREEK, NORTH OF SR518, WEST OF 42ND AVE 5 L=AD AGENCY: CITY OF TUKWILA FILE NO: E96-0020 The. City has determined that the proposal does not have a probable i tgn i f : cant adverse impact on the environment. An environmental impact statt:nent. (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 avra i l ab y e to the public on request.. The conditions to this SEPA Determination ion 3r'e attached. This s DNS is Issued under 197-11-340(2). Comments must be submitted by At 1S?�, 199 . The lead agency will not act on this €:,. =pc.:a1 for 15 days from the date below. --- Lc -A- Date '7,teve Lancia: t.ek Rte:..fpon ible Official Date of Tukwila, ( s`06) 431-3680 6301 ScuLhcenter Boulevard .Tukwila, WA 9A1t3e3 Copies of the procedures for . SEPA appeals are available with the Department t of Community Development. • • CITY TUKWILA CONDITION'S Address: A,pplca:i.: PHIL FRASER Status: IS'SIIED °:-rm t Nc : E96 -0C20 Applied: 06/18/1996 Type: P -SPA DNSC Approved: 07/24/1996 Lc:cat cn: GILLIAM CREEK, NORTH OF SR51 , WEST OF 42ND AVE S Parcel sr- Wil 'i Yzg •.4•:L•b:k*.*:L*:A•4•t•§:A•:A•*;k•k.•.L,:4*•k:k**.l•*:k:*-i'*:M•kk•b•,L;4•***k•A:*4.444*444•kM*M4444.4k• 4. 4*• k*• k•4***•k•k•M•k* 1. EXISTING TREES TO BE SAVED SHALL BE MARKED IN THE FIELD PRIOR TO THE START OF CONSTRUCTION. 2 CLEARING LIMITS AND TREE PROTECTION MEASURES SHALL BE INSTALLED TO PREVENT 1INNE'S'SE'SfARY DISTURBANCE AND LOSS OF VEGETATION. • 3. THE SURVIVAL OF THE NEW PLANTINGS SHALL BE MONITORED FOR TWO `EARS AND ANY DEAD PLANTS OR TREES REPLACED. CHECKLIST: ENORONMENTAL REVIEW/SHORELINE PERMIT MAILINGS • () U.S. ARMY CORPS OF ENGINEERS () FEDERAL HIGHWAY ADMINISTRATION (, DEPT OF FISH & WILDUFE () OFFICE OF ARCHAEOLOGY () TRANSPORTATION DEPARTMENT () DEFT NATURAL RESOURCES () OFFICE OF THE GOVERNOR () DEPT OF COMMUNITY DEVELOP (DEPT OF FISHERIES & WILDUF () KC. PLANNING & COMMUNITY DEV. () BOUNDARY REVIEW BOARD () FIRE DISTRICT #11 () FIRE DISTRICT #2 () S CENTRAL SCHOOL DISTRICT () TUKWILA LIBRARIES () RENTON UBRARY () KENT UBRARY () CITY OF SEATTLE LIBRARY ()USWEST () SEATTLE CRY UGHT () WASHINGTON NATURAL GAS () HIGHLINE WATER DISTRICT ( ) SEATTLE WATER DEPARTMENT ( ) TCI CABLEVISION () OLYMPIC PIPELINE () KENT PLANNING DEPT ( ) TUKWILA CRY DEPAR3 aC) PUBLIC WORKS () POLICE () PLANNING () PARKS & REC. ENTS: () FIRE O FINANCE () BUILDING () MAYOR () PUGET SOUND REGIONAL COUNCIL () P.S. AIR POLLUTION CONTROL AGENCY () SW K C CHAMBER OF COMMERCE () MUCKLESHOOT INDIAN TRIBE () DUWAMISH INDIAN TRIBE () DAILY JOURNAL OF COMMERCE () VALLEY DAILY NEWS 7/12/95 C:WP51DATA\CHKLIST FEDERAL AGENCIES () U.S. ENVIRONMENTAL PROTECTION AGENCY () U.S. DEPT OF H.U.D. WASHINGTON STATE AGENCIES () DEPT OF SOCIAL & HEALTH SERV. () DEPT OF ECOLOGY, SHORELANDS DIV ( DEPT OF ECOLOGY, SEPA DMSIO () OFFICE OF ATTORNEY GENERAL * SEND CHECKLIST WITH DETERMINATIONS * SEND SITE MAPS WITH DECISION KING COUNTY AGENCIES () KC. DEPT OF PARKS () HEALTH DEPT () PORT OF SEATTLE BUILDING & LAND DEV. DIV -SEPA INFO CENTE SCHOOLS/LIBRARIES () HIGHLINE SCHOOL DISTRICT () K C PUBUC UBRARY () SEATTLE MUNI REF UBRARY () SEATTLE SCHOOL DISTRICT () RENTON SCHOOL DISTRICT UTILITIES () PUGET SOUND POWER & LIGHT () VAL-VUE SEWER DISTRICT () WATER DISTRICT #20 () WATER DISTRICT #125 () CITY OF RENTON PUBUC WORKS () RAINIER VISTA () SKYWAY CITY AGENCIES () RENTON PLANNING DEPT () CITY OF SEA -TAC () CITY OF BURIEN ( ) TUKWILA PLANNING COMMISSION MEMBERS ( ) TUKWILA CITY COUNCIL MEMBERS OTHER LOCAL AGENCIES () METRO ENVIRONMENTAL PLANNING DIV. OFFICE/INDUSTRIAL 5,000 GSF OR MORE RESIDENTIAL 50 UNITS OR MORE RETAIL 30,000 GSF OR MORE MEDIA ( HIGHLINE TIMES SEATTLE TIMES • • PUBLIC NOTICE MAILINGS FOR PERMITS SEPA MAILINGS Mail to: (comment period starts on date of mailing) Dept. of Ecology Environmental Review Section Applicant Other agencies as necessary (checked off on attached list) Include these documents: SEPA Determination (3 -part form from Sierra) Findings (staff report, usu. with MDNS) SEPA Checklist (filled out by applicant) Drawings/Plans of project (site plan, elevations, etc. from PMT's) Affidavit of Dlstribution (notice was mailed & sent to newspaper). SHORELINE MAILINGS Notice of Application: Notice of application for a substantial development Permit must be mailed to owners and to property owners within 300 feet of subject property, prepare an affidavit of publication, and publish two consecutive weeks with deadline for comments due 30 days after last newspaper publication date. Shoreline Permit: Mail to: (within 8 days of decision; 30 -day appeal period begins date received by DOE) Department of Ecology Shorelands Section State Attorney General Applicant Indian Tribes Other agencies as necessary (checked off on attached list). Include these documents: Shoreline Substantial Development Permit (3 -part form from Sierra) Findings (staff report, if applicable) Shoreline Application Form (filled out by applicant) Drawings/Plans of project (site plan, elevations, etc. from PMT's) Site plan, with mean high water mark & improvements Cross-sections of site w/structures & shoreline Grading plan Vicinity map SEPA Determination (3 -part form from Sierra) Findings (staff report, usu. with MDNS) SEPA Checklist (filled out by applicant) Any background studies related to impacts on shoreline Notice of Application Affidavit of Distribution (notice was mailed & sent to newspaper) Affidavit of Publication (notice was published in newspaper). Memorandum TO: Jack Pace FROM: Nora Gierloff Id , RE: SEPA - Gilliam Creek Drainage Improvements DATE: July 22, 1996 Project File No. E96-0020 Project Description: The project will provide detention and water quality improvements along the Gilliam Creek corridor between 42nd Avenue S. and 40th Lane S. in the City of Tukwila. Two ponds will be reconstructed and expanded within the existing stream by reconstruction of two dam structures crossing the existing ravine. They will provide detention volume to reduce existing peak flows of the creek by the available pond capacity and compensate for the additional paved roadway from the upcoming 42nd Avenue S. widening project. The biofiltration swale will provide improved water quality for both the existing stream base flow and the roadway runoff. Each will be diverted to the biofiltration swale prior to discharge downstream. A trail will be constructed between 42nd Avenue S. and 40th Lane S. along the north side of the creek to provide pedestrian access for viewing of the stream and maintenance access to the check dams. Agencies With Jurisdiction: Washington State Department of Fish and Wildlife Comments to SEPA Checklist: Gary Schulz, Urban Environmentalist: Based on the sensitive area regulations combined with the tree ordinance, the proposed landscape plan is appropriate. Steep slopes and associated vegetation will remain undisturbed where possible. Tree replacement exceeds the amount required by the tree ordinance. In addition, the planting plan includes a variety of native shrubs. Summary of Primary Impacts: 1. Earth - Soil will be disturbed during construction of the dams and pedestrian trail. Erosion control and revegetation measures will be used to minimize the effects of this disturbance. The access road and trail will be gravel, so no impervious surfaces will be created by this project. Page 1 • 2. Air - There will be exhaust emissions from construction equipment during construction. The project will have no air emissions when complete. 3. Water - Runoff from the new roadway facility will be collected along 42nd Avenue S. and directed to the biofiltration swale and ponds being constructed prior to discharge into Gilliam Creek.. The detention system will provide detention time for sediment removal and clean the stormwater prior to discharge. 4. Plants - Disturbed areas will be planted according to the revegetation plans. The eleven trees removed for construction of the dams will be replaced by 24 new trees. Measures will be taken to protect existing trees and shrubs from the construction activity. 5. Animals - No endangered or candidate species are known to be on site. 6. Energy and Natural Resources - The project will require energy for construction equipment and for vehicles coming to the site. 7. Environmental Health - No environmental health hazards are anticipated. Construction equipment operation will need to comply with Tukwila's noise ordinance. 8. Land and Shoreline Use - The project will not affect the existing single family house on site. 9. Housing - The proposal will not result in a change to the housing supply. 10. Aesthetics - The project is not subject to BAR requirements. 11. Light and Glare - The proposal will not generate light or glare. 12. Recreation - The proposal will provide new opportunities for area residents to access and view the creek. 13. Historical and Cultural Preservation - The site is not known to have any historical or cultural significance. 14. Transportation - The proposal is not expected to result in more vehicular traffic 15. Public Services - The project is not likely to generate any increase in demand for public services. 16. Utilities - The project is not likely to increase demand on utility systems. Recommended Threshold Determination: Mitigated determination of non -significance. Page 2 • • Mitigation Measures: 1. Existing trees to be saved shall be marked in the field prior to the start of contruction. , 2. Clearing limits and tree protection measures shall be installed to prevent unnecessary disturbance and loss of vegetation. 3. The survival of the new plantings shall be monitored for two years and any dead plants or trees replaced. Page 3 MEMORANDUM TO: Nora Gierloff, Assistant Planner FROM: Gary Schulz, Urban Environmentalist DATE: July 22, 1996 RE: Environmental Review for Gilliam Creek Drainage Improvements. Listed below are comments related to SEPA and City regulations. Please let me know if you have any questions. TREE REGULATIONS: Based on the sensitive area regulations combined with the tree ordinance, the proposed landscape plan is appropriate. Steep slope and associated vegetation will remain undisturbed where possible. Tree replacement exceeds the amount required by the tree ordinance. In addition, the planting plan includes a variety of native shrubs. The only conditions you may want to consider would be to require that saved trees be marked in the field prior to the start of construction. Also, clearing limits and tree protection measures be installed to prevent unnecessary disturbance. There should be a monitoring program to insure the survival of the plantings. In the past I have performed this function on some City projects but it should be mentioned in the SEPA because it was left out of the plans. Gilliam Creek Water Quality Monitoring Technical Memorandum .prepared by Ado(fsan Associates, Inc. Introduction. The City of Tukwila has retained Perteet Engineering, Inc. to prepare design documents associated with improvements to 42nd Avenue SE in Tukwila, Washington. One section of the roadway to be improved crosses Gilliam Creek. Because of the crossing, there is a potential for water quality degradation due to both construction activities. and to the flrture use of the improved road surface. Accordingly, the City determined that baseline water quality data should beobtained so that potential impacts from the road improvements may be identified during and following construction. Perteet Engineering subconsulted that portion of their design project to Adolfson Associates,• Inc. This Technical Memorandum summarizes water quality characteristics obtained from a baseline sampling event. Zunialing. Duplicate water.samples weretaken on 15 June 1995 from Gilliam Creek upstream of the 42nd Avenue crossing. Field instrumentation was used to determine pH and temperature. Samples were also delivered to Analytical Resources, Inc., an EPA- certified laboratory, .for analysis of dissolved heavy metals, total petroleum hydrocarbons, organophosphorous 'pesticides, and dissolved oxygen. Retult§. The pH of Gilliam Creek was slightly acidic: Sample #1 had a pH of 6.22, Sample #2 had a pH of 6.33. The water temperature in both samples was 11 °C. • Dissolved oxygen (DO) in Sample #1 was 9.7 mg/L, and Sample #2 had a DO level of 8.9 mg/L; note that the units "mg/L" are sometimes referred to as "parts per million," or ppm. Dissolved heavy metals analyzed included cadmium (Cd), copper (Cu), lead (Pb), and zinc (Zn). No Cd, Cu, or Pb was found in either sample above the analytical detection limits (0.0002 mg/L for Cd, 0.002 mg/L for Cu, 0.001 for.Pb). However, detectable levels of Zn were found in both samples. Sample #1 had a Zn concentration of 0.022 mg/L and Sample #2 had a Zn concentration of 0.015 mg/L. The levels of total petroleum hydrocarbons (TPH) in both samples were also below the analytical detection limit of 1.0 mg/L.. Similarly, no organophosphorous pesticides were • detected in either sample. The pesticides which were included in the analysis include the following: TEPP, Dichlorvos, Mevinphos, Demeton, Ethoprop, Naled, Sulfotepp, Monocrotophos, Phorate, Dimethoate, Diazinon, Disulfoton, Methyl Parathion, Ronne(, Malathion, Chlorpyrifos, Fenthion, Ethyl Parathion, Trichloronate, Stirophos, • • Fensulfothion, Tokuthion, Merphos, Bolstar, EPN, Methyl Azinphos, and Coumaphos. isc1ssion.. The pH values obtained from both samples were well within:the range... expected for freshwater streams. From a fisheries resources perspective, the EPA has determined that streamwater pH values should be in the range of 6.5 to 9,0 to comply with the Clean Water Act. The temperature of Gilliam Creek was in the optimal range for RECEIVED salmonid fishes, and well below lethal levels for adult fish (typically between 20 and 25 : CITY• QFTUKWILA JUN 1 -8 1996 Gilliam Creek Water QualityPERMITCE Pagel LATER 8T09-692-90Z-T:131 9NIeI33NI9N3 1.331.3d 20'd Z00'oN TS:8 96 2Z UPI !, • • °C). Note,however, that no populationsof salmonid fishes are known to exist in this reach of Gilliam Creek... The DO levels detected in these samples were also within the recommended range for.supporting salmonid populations. While no salmonids utilize this reach of the stream, water from the study area is conveyed to downstream reaches were salmonid use is possible. Since no detectable levels of Cd, Cu, Pb, TPH;'.or pesticides were found, these chemical species do not appear to present a°risk to aquatic organisms. Further, the only potential pollutant which was detected - Zn.- was found in concentrations that were significantly lower than those necessary to adversely. impact aquatic populations. Summary. The water quality of this reach .of Gilliam Creek on 15 June 1995 can be characterized as good.: Temperature, pH, DO, and Zn levels were all within ranges sufficient to support salmonid resources, either existing downstream populations or populations which may be introduced to the stream within the project vicinity. No detectable amounts of potentially harmful pollutants - including Cd, Cu, Pb, pesticides, and TPH - were found.. • 4 ndr w 3; Castelle Director of Natural Sciences Giliiarn Creek Water Quality Page 2. V0'd Z00'°N IS:8 96 SZ UPI 8109 -622 -90Z -T:131 9NI�133NI9N3 1331d3d • • ENVIRONMENTAL CHECKLIST A. BACKGROUND 1.Name of Proposed Project, if Applicable: City of Tukwila - Gilliam Creek Drainage Improvements 2.Name of Applicant: City ofTukwila 3.Address and Phone Number of Applicant and Contact Person: Phil Fraser City of Tukwila Dept. of Public Works 6300 Southcenter Blvd. Tukwila, WA 98188 4.Date Checklist Prepared: June 17, 1996 5. Agency Requesting Checklist: City of Tukwila, Public Works Department 6.Proposed timing or Schedule (including phasing, (if applicable): Purchase Easements Summer, 1996 Bid Project: Winter, 1996 Construct: March, 1997 through October 1997 Planting - Octobeer 1997 through Spring 1998 &.1'- 00,90 7.Do you have any plans for future additions, expansion, or further activity related to or connected with this proposal? If "yes", explain. 42 Avenue S. - Phase 3 construction is proposed for the next 1 to 3 years. Drainage will outfall to the ponds and biofiltration swale for detention and water quality enhancement. 8.List any environmental information you know about that has been prepared, or will be prepared, directly related to this proposal. A water quality report was prepared by Adolfson Associates, Inc. to determine the viablility of fish for survival in the waters of Gilliam Creek within the project limits(Copy of report attached). RECEIVED PITY OF TUKWM JUN 1 81996 FfPwrr OEM'ER • • 9. Do you know whether applications are pending for governmental approvals of other proposals directly affecting the property covered by your proposals? If yes, explain. None 10. List any government approvals or permits that will be needed for your proposal, if known. Washington State Dept. of Fish and Wildlife HPA. 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. The project will provide detention and water quality improvements along the Gilliam Creek corridor between 42nd Ave. South and 40th Lane South in the City of Tukwila. Two ponds will be reconstructed and expanded within the existing stream by reconstruction of two dam structures crossing the existing ravine. They will provide detention volume to reduce existing peak flows of the creek by the available pond capacity and compensate for the additional paved roadway from the upcoming 42nd Avenue South widening project. The biofiltration swale will provide improved water quality for both the existing stream base flow and the roadway runoff. Each will be diverted to the biofiltration swale prior to discharge downstream. As the pond locations approximate historical trout rearing ponds, the new ponds are also intended to be permanent pools for support of stocked residential fish that will be planted by local school children. Upstream of the ponds, a series of check dams will be constructed to help create smaller pools and riffles where residential fish can utilize the existing stream corridor. A trail will be constructed between 42nd Ave. South and 40th Lane South, along the north side of the creek to provide pedestrian access for viewing of the stream and maintenance access to the check dams. 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 applications related to this checklist. The project is located in Section 22, T23N, R4E, WM. Construction of the improvement will occur within right-of-way of both the City of Tukwila and WSDOT and also drainage easements procured for this project from adjacent property owners. Environmental Checklist - Page 2 • • B. ENVIRONMENTAL ELEMENTS 1. Earth a. General description of the site (circle one): Flat, rolling, hilly, steep slopes, mountainous, other. b. What is the steepest slope on the site (approximate percent slope)? 66% 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. The existing site has been filled during construction of SR 518 immediately south of the creek, while a steep natural bank exists to the north of the creek. The surface soils consist of glacial till with rock armoring along the westerly two thirds of the site. The bed of the stream consists of loose sand and sediment over the glacial till bed. d. Are there surface indications or history of unstable soils in the immediate vicinity? If so, describe. None. e. Describe the purpose, type, and approximate quantities of any filling or grading proposed. Indicate source of fill. Grading of the site for construction of the dams will be kept to a minimum to avoid disturbance of the existing slopes and creek corridor as much as possible. The existing stream channel will not be disturbed except to the cut and fill limits of the dams and pedestrian trail. It is anticipated to import less than 500 cubic yards of material (CSTC, gabion rock and concrete), to establish the pedestrian trail, dams and access roadway. Native material excavated from the dam foundations will be replaced adjacent to the dam structures to match into existing contours. f. Could erosion occur as a result of clearing, construction, or use? If so, generally describe. The site is fairly steep along both sides of the creek corridor. If the slopes were left unprotected during construction once the foundation for the dam structures were cleared and grubbed, the slopes could experience erosion. The contractor will need to protect the exposed subgrade in accordance with the Temporary Erosion/Sedimentation Control Plan at all times and reestablish vegetation (as described on the attached Landscaping Plan) as soon as possible to assure stability from erosion. g. About what percent of the site will be covered with impervious surfaces after project construction (for example, asphalt or buildings)? None of the proposed site is anticipated to be paved with this project. The new access road will be in the same location as the existing access to the back of the property, but will be formalized by constructing a new gravel surface. The pedestrian trail will also be constructed with a gravel surface. Environmental Checklist - Page 3 • • h. Proposed measures to reduce or control erosion, or other impacts to the earth, if any: Silt fences and straw bale check dams, as detailed in the Temporary Erosion/Sedimentation Control Plan, will be installed in all areas stripped of vegetation. Clearing will be limited to the actual area of grading within the project limits. Existing trees and vegetation will be maintained as much as is practical to assure stability of the onsite soils 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. Emissions of dust and vehicle exhaust would be generated during construction activities. 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. The site is within the stream corridor of Gilliam Creek. The dams will be constructed across the creek itself to re-establish the two detention ponds. Gilliam Creek continues easterly from the site for approximately 1/4 mile to a point where it enters an enclosed system which emerges to open channels prior to discharge into the Green River/Duwamish Channel. 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. Yes. (See answer 1 and attached plans.) 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. It is anticipated to import less than 500 cubic yards of material (crushed surfacing top course, gabion rock and concrete), to establish the pedestrian trail, dams and access roadway Environmental Checklist - Page 4 • • 4) Will the proposal require surface water withdrawals or diversions? Give general description, purpose, and approximate quantities if known. The stream will be diverted through bypass pipes during construction of the dams. 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 b. Ground: 1) Will ground water be withdrawn, or will water be discharged to ground water? Give general description, purpose, and approximate quantities if known. No 2) Describe waste material that will be discharged into the ground from septic tanks or other sources, 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. N/A 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. Runoff from the new roadway facility will be collected along 42nd Ave. South and directed to the biofiltration swale and ponds being constructed for treatment and detention of the runoff prior to discharge downstream in Gilliam Creek, which discharges into the Green River/Duamish Channel approximately two miles downstream from the site. 2) Could waste materials enter ground or surface waters? If so, generally describe. No d. Proposed measures to reduce or control surface, ground, and runoff water impacts, if any: The detention system will attenuated developed flows to replicate existing conditions for the site. Flow through the detention system will provide detention time for sediment removal from the runoff and polish the stormwater prior to discharge. Environmental Checklist - Page 5 • • 4. Plants a. Check or circle types of vegetation found on the site: X deciduous tree: alder, maple X evergreen tree: Douglas Fir/Hemlock/Cedar X shrubs _X_ grass Pasture crop or grain _X_ wet soil plants: cattail, buttercup, bulrush, skunk cabbage, other. (reed canary grass) water plants: water lily, eelgrass, milfoil, other _X_ other types of vegetation b. What kind and amount of vegetation will be removed or altered? Trees and shrubs will be removed for construction of the dams. The existing grass will be stripped in preparation of the subgrade for the access road. Tree Replacement Chart: (as shown on the Landscaping Plan) Size Quantity Replace Mitigation (Diam.) Removed Ratio Quantity 4"-8" 2 1 2 8"-12" 7 2 14 >12"-18" 2 4 8 Totals: 11 24 c. List threatened or endangered species known to be on or near the site, if any: None d. Proposed landscaping, use of native plants, or other measures to preserve or enhance vegetation on the site, if any: Existing vegetation will be utilized where practical and mitigations for the necessary tree removal shall be as depicted on the mitigation plan included with the design drawings. 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: birds: hawk, heron, eagle, songbirds, other: ducks mammals: deer, bear, elk, beaver, other: fish: bass, salmon, trout, herring, shellfish, other: Environmental Checklist - Page 6 • • 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: Construction of the ponds will provide a larger permanent pool for use by ducks. Existing songbirds will have the same habitat opportunities at completion of the project as currently exists. 6. Energy and Natural Resources a. What kinds of energy (electric, natural gas, oil, wood stove, solar) will be used to meet the completed project's energy needs? Describe whether it will be used for heating, manufacturing, etc. Fossil fuels would be used during 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 of other proposed measures to reduce or control energy impacts, if any: N/A 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. None 1) Describe special emergency services that might be required. N/A 2) Proposed measures to reduce or control environmental health hazards, if any: N/A Environmental Checklist - Page 7 • • b. Noise 1) What types of noise exist in the area which may affect your project (for example: traffic, equipment, operation, aircraft, other? N/A 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: traffic, construction, operation, other)? Indicate what hours noise would come from the site. Slight noise impacts would be generated by construction activities 3) Proposed measures to reduce or control noise impacts, if any: Construction activities will be limited to weekdays between 7:00 AM and 5:30 PM, and meet the requirements of the City of Tukwila Noise Ordinance. 8. Land and Shoreline Use a. What is the current use of the site and adjacent properties? The site is currently an uncontrolled stream with rock armored slopes through most of the corridor. Immediately south of the site is SR 518. At the top of slope to the north, there are apartment buildings. At the east end of the site, adjacent to the existing and proposed access road, there is a single family house which is owned by the City of Tukwila and occupied through the City's low rent housing program. b. Has the site been used for agriculture? If so, describe. In past years, the site was used for personal use fish rearing ponds by the residential owner. c. Describe any structures on the site. One City owned single family house. The house will be maintained as -is. d. Will any structures be demolished? If so, what? No. e. What is the current zoning classification of the site? N/A f. What is the current comprehensive plan designation of the site? N/A g. If applicable, what is the current shoreline master program designation of the site? N/A Environmental Checklist - Page 8 • • h. Has any part of the site been classified as an "environmentally sensitive" area? If so, specify. Yes. The site contains a Type 2 stream and steep slopes. The stream is not populated with fish at this time, and downstream impediments preclude migration of fish upstream to this reach. Geotechnical investigations indicate the project can be constructed without disturbing the existing steep slopes. i. Approximately how many people would reside or work in the completed project? N/A j. Approximately how many people would the completed project displace? None k. Proposed measures to avoid or reduce displacement impacts, if any: N/A 1. Proposed measures to ensure the proposal is compatible with existing and projected land uses and plans, if any: N/A 9. Housing a. Approximately how many units would be provided, if any? N/A b. Approximately how may units, if any, would be eliminated? 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? N/A b. What views in the immediate vicinity would be altered or obstructed? N/A Environmental Checklist - Page 9 • • c. Proposed measures to reduce or control aesthetic impacts, if any: N/A 11. Light and Glare a. What type of light or glare will the proposal produce? What time of day would it mainly occur? N/A b. Could light or glare from the finished project be a safety hazard or interfere with views? N/A c. What existing off-site sources of light or glare may affect your proposal? N/A d. Proposed measures to reduce or control light and glare impacts, if any: N/A 12. Recreation a. What designated and informal recreational opportunities 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 opportunities to be provided by the project or applicant, if any: The project includes construction of a new access roadway to the ponds and a pedestrian trail along the northerly side of the creek. This will provide new opportunities for area residents to access and view the creek. 13. Historic and Cultural Preservation a. Are there any places or objects listed on, or proposed 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? Environmental Checklist - Page 10 • • None c. Proposed measures to reduce or control impacts, if any: N/A 14. Transportation a. Identify public streets and highways serving the site, and describe proposed access to the existing street system. Show on site plans, if any. The site can be accessed from 42nd Ave. South at the east and 40th Lane South at the west. The access points will be improved, but will not result in increased use by vehicular traffic. b. Is site currently served by public transit? If not, what is the approximate distance to the nearest transit stop? N/A c. How may parking spaces would the completed project have? How many would the project eliminate? N/A 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). N/A e. Will the project use (or occur in the immediate vicinity of) water, rail, or air transportation? If so, generally describe. N/A f. How many vehicular trips per day would be generated by the completed project? If known, indicate when peak volumes would occur. N/A g. N/A Proposed measures to reduce or control transportation impacts, if any: Environmental Checklist - Page 11 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: It is not anticipated that there will be any need for increased public services of water or sewer, because of the project. The new ponds, check dams and biofiltration swale will increase the maintenance effort for continuous efficient operation of the system. If vandalism of parked vehicles occurs after construction of the facility, increased police protection may be necessary. b. Proposed measures to reduce or control direct impacts on public services, if any. N/A 16. Utilities a. Circle utilities currently available at the site: electricity, natural gas, water, refuse service, telephone, sanitary sewer, septic system, other. 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. N/A C. SIGNATURE The above answers are true and complete to the best of my knowledge. I understand that the lead agency is relying on them to make its decision. Signature: Date submitted: 33 , Environmental Checklist - Page 12 O CITY OF TUKWILA TUKWILA, WASHINGTON GILLIAM CREEK DRAINAGE IMPROVEMENTS PROJECT NO. 93-DRO8 SHEET INDEX LEGEND 1 PLAN SHEETS 2,3 NORTH POND SECTION & DETAILS 4 SOUTH POND SECTION & DETAILS 5 T.E.S.C.P. 6 LANDSCAPING PLANS 7,8 1=J5 VICINITY MAP ® Perteet Engineering INCORPORATED Civil Civil and Transportation Consultants 2828 Colby Avenue • Suite 410 • Everett. WA 98201.12061 252.7233 CITY OFFICIALS CITY COUNCIL MEMBERS PAM CARTER, PRESIDENT JOE H. DUFFIE JOAN HERNANDEZ ALLAN EKBERG STEVE MULLET JIM HAGGERTON PAMELA LINDER CITY ADMINISTRATION JOHN W. RANTS, MAYOR JOHN McFARLAND, CITY ADMINISTRATOR JANE CANTU, CITY CLERK ROSS A. EARNST, P.E., DIRECTOR OF PUBLIC WORKS CITY ENGINEER RON CAMERON, P.E. RECEIVED JUL 2 2 1996 COMMUN7Y DEVELOPMENT • • ABBREVIATIONS AP. - ANGLE POINT BACK S/W - TOP BACK OF SIDEWALK C.B. - CATCH BASIN C.S.T.C. - CRUSHED SURFACING TOP COURSE D.I.S.S.P. - DUCTILE IRON STORM SEWER PIPE D/W - DRIVEWAY E.B.T. - EDGE OF PAVEMENT EL. - ELEVATION EXIST.- EXISTING F.H. - FIRE HYDRANT G.E. - GRATE ELEVATION I.E. - INVERT ELEVATION LT. - LEFT M.H. - MANHOLE MON. - MONUMENT N.I.C. - NOT INCLUDED IN CONTRACT N.T.S. - NOT TO SCALE P.C.S.S.P. - PLAIN CONCRETE STORM SEWER PIPE P.P. - POWER POLE PL - PROPERTY LINE P.V.C. - POLYVINYL CHLORIDE RT. - RIGHT R/W - RIGHT OF WAY SIG. - SIGNAL S.O. - STORM ORAN SL. - STREETLIGHT S.P. - SERVICE POLE SPEC. - SPECIFICATIONS STA. - STATION STD. - STANDARD TELE. PED. - TELEPHONE PEDESTAL T.P. - TELEPHONE POLE TYP. - TYPICAL U.C. - UNDER GROUND W.M. - WATER METER W.V. - WATER VALVE W.V.M. - WATER VALVE MARKER POST ---E� EXISTING DITCH OR CHANNEL PROPOSED DITCH OR CHANNEL 1 J T T t- N.' L '� EXISTING RIGHT OF WAY LINE PROPOSED RIGHT OF WAY UNE CATCH LINES - CUT - FILL EXISTING FENCE NEW OR RELOCATED FENCE EXISTING DRAIN PIPE WHEELCHAIR RAMP LEGEND 0 0/® SI 0 CO 03 001 EXISTING UNDERGROUND TELEPHONE 1 I) t11 1 11 111 EXISTING WATER UNE EXISTING GAS LINE EXISTING SANITARY SEWER LINE PROPOSED STORM DRAIN LINE EXISTING STORM DRAN UNE EXISTING UNDERGROUND POWER EXISTING SEWER STUBS PROPOSED "REPLACE EXIST. SERVICE" (WATER) EXISTING EDGE OF PAVEMENT/DRIVEWAY EXISTING CURB. GUTTER 1 SIDEWALK EXISTING TREE (CONIFER) EXISTING TREE (DECIDUOUS) SECTION CORNER MONUMENT QUARTER SECTION CORNER MONUMENT 0 SURVEY MONUMENT CASE (EXIST.) 0 0 0 'o • Cati.t /�I O O MANHOLE CATCH BAST! TYPE 1/CONC. INLET(EX)ST./PROPOSED) CATCH BASIN TYPE 2 (EXIST./PROPOSED) VALVE (EXIST./PROPOSED) METER (EXIST./PROPOSED) FIRE HYDRANT (EXIST./PROPOSED) OTeITY POLE (EXIST) GUY ANCHOR Y. RDLIGNT LIRJINAIRE (EXIST) LUMINAINE (PROPOSED) J -BOX (EXIST./PROPOSED) TRAFFIC SIGNAL CONTROLLER TELEPHONE PEDESTAL ELECTRICAL VMA.T TELEPHONE MANHOLE MAILBOX (EXIST./PROPOSED) RETAINING WALL (EXIST./PROPOSED) ROCKERY (EXIST./PROPOSED) SIGNS (EXIST./PROPOSED) EXISTING TREE EXISTING SHRUB/TREE LINE PROPOSED PEDESTRIAN PATH PROPOSED GABON CHECK DAM EXISTING ROCK SLIDE PROTECTION CONSTRUCTION NOTE DRAINAGE NOTE TAX LOT NUMBER 121 1= E=4U R PUBLIC WORKS DEFT. —ENQINEERI A ARKS—BUILOINC-- by dote designed HJJ 3/96 drown EJO 3/96 checked Low 3/96 proj eng proj dr Feld bk ne c©RoaRantao Perteet Engineering ..--INCORPORATISD�� Civil and Transportation Consultants 2823 _olby A•+Nue• Suite 4 • E.vstt. ca_pt•I_,..E_._•__- CITY OF TUKWILA GILLIAM CREEK LEGEND I 1 18 I file no no date revisions scale dote 1 1 TRAIL PROFILE 1 1 NTS 1 1 E.W.CONANT EASEMENT _ 260 R JR. SW 1/4, SEC 22, TWP. 23N, RGE. 4E STA 11.16 (35' LT) CONSTRUCT 22 LF 48'1 DIA./ CONC. CULVERT. PLAC INVERT 1' BELOW FLO LINE (SEE TRAIL PROFILE.) STA 11.80 (351T) END 10' WIDE TRAIL BEGIN 6' WIDE TRAIL REMOVE 6 LF OF CHAIN LINK FENCE TYPE 1. INSTALL 2 0255 END POSTS FOR CHAIN LINK FENCE AT CROSSING. CONSTRUCT PEDESTRIAN TRAIL. SEE DETAIL THIS SHEET. MATCH LINE - STA 14.50 Ian ,• 0 r/II* MOM MERINO ■1e1C /37.1' 11:111 BeniRE SOWN. `11111-11111s. Ob. ,u..—�. 1Ob. 11111■1 1111CtlS��O%e1e1G)ifael�����0 ■1�p� -wee■ � ■e:feel ■eue►es . -"•�: ie 10,E � ■111■ tit S STA 14-35 (10' LT) CONSTRUCT 21' WIDE GABION CHECK DAM 0 20 40 60 SCALE IN FEET / z" STA 13-65 (2'LT) CONSTRUCT 33' WIDE GABION CHECK DAM /STA 10-00 (97' LT) BEGIN 10' WIDE PATH CONSTRUCT 2 /BOLLARDS FOR TRAIL MARKER (SEE STD. DETAIL) / STA 10.22 (60' LT) 7ao�'F; o - 1• 4"A 10-05 (83' LT) /CONSTRUCT 3 BOLLARDS. 4' O.C. LENGTH AS REOUIRED REMOVE 20 LE OF CHAIN ---- LINK FENCE TYPE 1. _ - INSTALL 2 END POSTS FOR CHAIN LINK FENCE AT CROSSING - F -------- STA OW LINE STA 10.75 (35' LT) STA 12.75 (1' RT) CONSTRUCT 24' WIDE GABION CHECK DAM EXISTING SLOPE PROTECTION (typ) STA 11.75 (3' RT) CONSTRUCT 21' WIDE GABION CHECK DAM SEE DETAIL THIS SHEET (typ) PLACE RIP RAP AT OUTFALL CONSTRUCT 5OLF PEDESTRIAN HANDRAIL (FIELD FIT TO SLOPES) 3'x3'z3' GABIONS i. SECTION GABION CHECK DAM DETAIL NTS PROFILE PLACE ROCK FOR ROCKERY (12" DIA.) BEHIND GABION FOR EROSION CONTROL ------------------ EXISTING GROUND___ SELECTIVE CLEARING LIMITS • VARIES to' 10' MAX. 6' 10' 2'/. 4"-12" 01A— TREATED TIMBERS / /`/ / _ / / / / / / / • NOTE SELECTIVE CLEARING LIMIT CANNOT EXTEND BEYOND EASEMENT NOM CUT REBAR FLUSH WITH CENTER OF LOG. PEDESTRIAN TRAIL DETAIL NTS ./ K.C.A.S. TEMP. BENCH MARK CATCH BASIN RIM STA. 68.22 (18'LT) ELEV. 216.17 1 -�� PUBLIC WORKS DEPT. 1305 —ENGINEERI A ARKS—BUILDING— a • ao•o +�c�s�caN /ONAL f by igned HJJ drown OJO checked K6■ proj eng dote 3/96 3/96 3/96 proj dr field bk nq ICC)R H a n is o CITY OF TUKWILA GILLIAM CREEK RPerteet Engineering PLAN INCORPORATED�� Civil and Transportation Consultants BEGIN T 0STA 4-.50 ___5 COM, A•ewe • Suite 4k• • Everett. tar ?5201.4C•E. 25:-7.33 no dote revisions 8 Ian no scale dote 1 EXISTING GROUND - � 3 / • INSTALL ROCKERY STA 16.50.(401(T) TO STA 17.05 (30'RT) :C•:ESS �G D 1.25' 4" CSTC COMPACTED SUBGRADE 8" GRAVEL. BORROW 6" TOPSOIL TYPE A SWALE AND ACCESS ROAD' DETAIL NTS CONSTRUCTION NOTE OPRESERVE EXISTING TREE OCLEARING LIMITS ARE TO THE CUT & FILL LINES AS SHOWN (TYP.) // SW 1/4, SEC 22, TWP. 23N, RGE. 4E CONSTRUCT PEDESTRIAN TRAIL SEE DETAIL, SHT. 2 EXISTING DAM STRUCTURE TO REMAIN D'AMBROSIO EASEMENT PROTECT EXIST. 12" STORM ORAN (APPROX. LOCATION) 0 20 40 60 SCALE IN FEET PROTECT EXIST. 18" STORM DRAIN (APPROX. LOCATION) REMOVE EXISTING TREE AS NEEDED (TYP) NORTH DAM SEE DETAIL. SHT. 4 • n i - i'-iric i, REMOVE EXISTING CONCRETE ELEV. 212.8 A.P. SWALE STA 16.25 (23'RT) ELEV. 213.7 BEGIN SWALE SOUTH DAM SEE DETAIL, SHT. 5 CONSTRUCT STEPS AS REQUIRED SEE SOUTH DAM DETAILS er e'-"'"" STA 69.60 (42nd AVE`) • STA 18.50 (CONTROL LINE) STA 69.44 (15'LT) STA 18.01 CONSTRUCT 2 BOLLARDS FOR TRAIL MARKER (SEE STD. PLAN) STA 69.03 (18'LT) CONTROL STRUCTURE 2 SEE NORTH DAM DETAIL. SHT. 4 CONSTRUCT ACCESS ROAD AND SWALE SEE DETAILS THIS SHEET. /4=1 TEMP. BENCH MARK CATCH BASIN RIM STA. 68.22 (18'LT) 7. ELEV. 216.17 a / ' = . STA 16.30 (42' RT) CONSTRUCT 3 BOLLARDS. 4' 0.C. CONSTRUCT 12" SO PIPE (10 LF) UNDER TRAIL • AS REODU(EO :I, /A O 442 / i CONTROL STRUCTURE 1 G.E. 220.0 SEE DETAIL. SHT. 5 MATCH LINE 14+50 'L i /�! % /`c K.C.AS. i / /O BENCH MARK 1 TOP BOLT BOTTOM FLANGE N -NW SIDE OF FIRE HYDRANT ON NORTH SIDE OF S 154TH ST. 200'•/- E. OF 42ND AVE. ELEV. 219.81 PUBLIC WORKS . DEPT. —ENGINEERI A ARKS—BUILDING— �[ ILMI[ 9/30/961 esigned rows checked proj eng proj dir riekt bk na by HJJ OJO dote 3/96 3/96 Kar 3/96 c©nouHune [Z]Perteet Engineering INCORPORATED�� Civil and Transportation Consultants •_Nt, Avenue . Suite 410 . E.uett. WA 90201.1_tc' CITY OF TUKWILA GILLIAM CREEK PLAN STA 14+50 TO END I3 s (ie no no date revisions stole dote 0 10 20 30 24OPIPE 1. zr S• 0.048'/ft SCALE IN FEET STA 17.63 (21'LT) - CB TYPE 2-48= - - W/ CL -AUT SHEARGATE . (SEE st0.91,ms no .PIPE ENO' RIP RAP 24" SD PPE 19' •SC 0.053711 VA 17.51(61.D PIPE ENO I.E. 206.0. • • • • , ," cj • / , ST 17-43 (9'RT) PIP END •-•.. • I. 210 (N, 4,)" cr) 12" SO PIPE 1.• 16' S- 0.008r/ft CONTROL STRUCTURE STA 17-59 (31'RT) SEE DETAIL THIS SHEET. PLAN SCALE: r• to. 12" SD PIPE L • 40' S•0.0057'/It STA 18-00 (36'RT) PIPE END (CAPPED) I.E. 210.10 214 100 YR STORM EVENT V 212 LIVE STORAGE: 1 v 2,0 am maxi 7725 CF 6" COVER •40 12" 0.C. (TYP) •40 12" 0.C. (TYP) 1.s. • SEE DETAIL THIS SHEET •40 12" 0.C. (TYP) 215 EXISTING SURFACE 209.0 FLOWUNE 17+40 GLACIAL TILL 17+60 • la • CONTROL bENSITY FILL A 17+80 210 205 200 rtowuNt PLACE RIP RAP AT OUTFALL 181-00 PROFILE SCALE: 1"• 5' 40 30 20 10 10 20 30 .220 215 19' 20' 22' 17.5' 210 205 EXISTING SURFACE CONCRETE DAM I• • • 206 200 GLACIAL TILL VARIES 6: AVE. N CONTROL DENSITY FILL BAFFLE REINFORCMENT DETAIL (TYP) SCALE: NTS DENSE FILL 12" SPLICE OVERLAP (TYP) CONTROL DENSITY FILL SECTION A -A SCALE: STA 17 • 60 SECTION SCALE: 1" • 5' G.E. 214.55 212.00 POND 2 12" I.E. 210.00 0.81Z 209.87 207.87 CONTROL STRUCTURE STA. 17.59 (31'RT) N.T.S. 12" 2.81% CATCH BASIN TYPE 2-54" ORIFICE DIA 3.55" I.E. 209.0D• PUBLIC WORKS DEPT. —ENGINIZERING—STREETS—WATER—SEWER—PARKS—BUILDING— ri roj mid bk no by HJJ 0.10 F.611 dote 3/96 3/96 3/96 conoKEIaniRo Perteet Engineering INCORPORATED Civil and Transportation Consultants 2525 Coey Avenue • Suite 41,:: • 5.e'etl A552O.2S4. 25:-7233 CITY OF TUKWILA GILLIAM CREEK NORTH DAM DETAIL ...fie no no date revisions scale date 0 10 20 SCALE IN FEET 30 08 TYPE 2,-48". WITH'CLEANOUT/SHEARGATE GE219,25 , 11.219:50 -•• 3' WIOF,' x 3,"HIGH GABION WING WALL RIP RAP - 24••,S0 PIPE . - 30'LF • ---5.0.0167-'/fl STA 17•61 -C31. -T) PIPE ENO LE. 211.0 _ - 40 LF S-0.010 '/' 12" SO PIPE _ - STA -16.20 (41'1331 _ Y- -4 _-•G.E.219.0•/- I.E.- STA 76••11 (22' __ -CB TYPE 2-54" G.E. 2-17.0-/- - -l.E. 214.60 POND 1 I.E. 214.00 STA 15=72 (30'RT) PIPE END ' I.E. 214.0 ; 24" S0/ PIPE 16 LF S•0.005 '/It C.E. 220.00 PLAN SCALE: 1" - 10' 218.00 TO SWALE CATCH BASIN TYPE 2-54" CONTROL STRUCTURE STA. 15.98 (26'RT) . N.T.S. ORIFICE DIA. 2.52" SD_PIPE - 14 LF 5.0.100 '/' PUBLIC WORKS DEPT _ENGINEER) A ARKS•-BUILDING- STA 15.98 (26'RT) CONTROL STRUCTURE SEE DETAIL. THIS SHEET EXIST. PROFILE ALONG ALIGNMENT EXISTING SURFACE STA 16.44 (76'RT) CAP PIPE END I.E.-214.2 LP ISOMETRIC IhkOp1 cxwc yr oiw 1 by designed HJJ drawn OJb checked 7. U pro) eng Prof der field bk na date 3/96 3/96 3/96 1.5' 219 100 YR. STORM E VENT V 1.5' 1.5: 8900 CF 217 TOP OF LIVE 21.4.1.09. DEAD STORAGE --- STORAGE V I�I� n Ifiltati•Ahm ����� TRIM GABION d RBEASaKDETS AS . 1• 0.25' CONCRETE CAP. SEE SPECIFICATIONS 0.75' GABION MATTRESS SPALLS.ENCASEL1 IN CONCRETE 0.75' GA810N MATTRES 2ff VARIES 6' AVE. RIP RAP GEOTEXTILE FOR v II I�U1�IU ICjI Etc GLACIAL TILL 2'x2' KEYWAY 3'x3' GARIONS GEOTEXTILE FOR EROSION CONTROL 3' 3'x3' HIGH GABION BAFFLE 220 215 11 1:S GABION RIP AP 212.25 211: 210 205 CONTROL DENSITY FILL 200 • • EROSION CONTROL 15+75 •4 0 12" 0.0 3" COVER 12" EMBEDDMEN1 6' 16+00 6' 1 16+25 PROFILE SCALE: 1" - 5' 225 220 215 EXISTING SURFACE '1119.75 Q 3' 24' TYP.) 7 5' 16.5: 219 00 \ 218.25 217.5C 210 205 30 25 20 GRAVEL 0.75' CASON MATTRESS SPALLS IN CONCRETE. 217.00 ENCASED 0.25' CONC. CAP 3'x3'x3'GABIONS (TYP) FINISHED SLOPE EXCAVATION SLOPE 'a`' :1•..„,.1. .•1• •e.•1.}'1..• ..L: •1.• ..17. . ° 4• \•J 4: ag 7. .. t BORROW CONTROL DENSITY FILL 15 1 0 5 GRAVEL. BORROW 35 40 Perteet Engineering INCORPORATED�� Civil and Transportation Consultants -Y.- =.,2y ,en•e•Swte 4t: • E,erett.'NA .-__. __.• SECTION SCALE: 1" • 5' CITY OF TUKWI,LA GILLIAM CREEK SOUTH DAM DETAIL 8 file no no dote revisions scale dote 2"x4" DOUGLAS FIR OR EOUAL — NEWLY GRADED OR DISTURBED SIDE SLOPE FILTER FABRIC MATERIAL —. T • 8 -- TYPICAL CROSS SECTION F&TER FABRIC MATERIAL NAAFI IOOX OR EOUILAVENT STAPLES OR WIRE RINGS (TYPICAL) 2"62".)4 GA WELDED WIRE FABRIC OR EQUAL 6' u u n II 11 14 11 11 11 11 Y 1/2" MAX. PERFORATIONS 24" CMP RISER -PERFORATED • 3' MIN T MIN. WASHED COARSE AGGREGATE FILTER MATERIAL PER WSDOT SPEC. 9-03.-1(3)C. GRADING NO. 4. 7- TEMPORARY DIVERSION DAM 4' POND BOTTOM — BURY BOTTOM OF FILTER FABRIC 2"x4" DOUGLAS FIR - 4' O.C. MATERIAL IN 8"x8" TRENCH. NO. 1GRADE OR EQUAL BACKFILL WITH COMPACTED GRAVEL BORROW. ELEVATION SILT FENCE STAKE BALES TO MNNTNN POSITION AS REQUIRED NTS ELEV. 214 GRAVEL FILTER MAY 8E HELD IN WITH WIRE MESH OUTLET PIPE STABLE BASE COVER GAPS N CONNECTION WITH FILTER FABRIC MATERIAL. INTI -SEEP COLLAR CMP RISER NTS TEMPORARY INTERCEPTOR SWALE DETAIL STRAW BALE AS REQUIRED 6 av 1'-0" MIN. FREEBOARD STRAW BALE DAM NTS LEGEND 666:6:::. 4.11.0414.110 O - • SILT FENCE - • CONSTRUCTION ENTRANCE - • STRAW BALE DAM ® - RISER PIPE & DAM IS - INTECEPTOR SWALE NTS 5 LF ADDITIONAL 24" TEMP DRAIN PIPE •1 . , , , . ; is 0 (STA 15.80•/-). 209 (STA 17.50•/-) PERMANENT CATCH BASIN & PIPES. (SEE SHEET 4). 10 LF ADDITIONAL 24" TEMP DRAIN PIPE TEMP. SEDIMENT POND 20 40 60 . ■ ■ s ■ SCALE N FEET 20 LF ADDITIONAL 24" TEMP DRAIN PIPE PERMANENT CATCH BASIN & PIPES. (SEE SHEET 5). , 10 LF ADDITIONAL 24" TEMP DRAIN PIPE — II jr%',...- 'i .1e. I: i. ii o - 1 • V i — ice_ • • • ni • 1 1 I1' I • I • -;i PUBLIC WORKS DEPT. —ENGINEERI A ARK3-BU1lA1NCi— I 17 ao.o .9 +fCIS7Ep i • • / to W IO ' o6 ,Zr) z. • t II 1 / 4"-8" QUARRY SPALLS, V- DEPTH (MIN.) 1:1 E=4 by designed HJJ drown ode checked 1611 dote 3/96 3/96 3/96 proj eng proj dir fie4d bk ne (cow viwrvs 1 co01�1touRaWiao ® Perteet. Engineering INCORPORATED Civil and Transportation Consultants 2 _olb1 Avenue• Suet 4l0•Eve,ell .m SE:Jl•t:oe :52.7733 CITY OF TUKWILA GILLIAM CREEK T.E.S.C.P. no dote revisions 6 i 8 file no scale dote NOTE: BASE INFORMATION SHOWN TO ASSIST PLANTING OPERATIONS ONLY. DO NOT USE THIS SHEET FOR GRADING/CONSTRUCTION PURPOSES. / j ca �- 1 PEDESTRIAN 41/ / HANDRAIL j, ; j _------ _- -- 1 O it j _ == ,i \ _ „,/ _ ------__ash, . j 0 MATCH LINE 14+50 ''', -f_ , ':::,----:-:-•,:'--;::: - i 1::::LIV!fris . ilP ' •sis • A r ; 1 AIr ,41s est 1 P:8111 -rrr:- 10,,,,, fie. i...i�i....mr,lkilgEwa ; r • • / trii�tras .eisR::atr Iltrir.iQr:Q rs:lis_: 4-it•tra:ir Rvtrig ` ty.�:iparo. - ei:esr ,��ariotptr trcitii ia•witst.�- Iwo/Crew et,'"eird. meal .L } skiSass- REFER TO PLANTING PLAN - LOWER REACH FOR PLANT SYMBOLS. �i1ollP%i■■lBB►s-■ !!lll' • 1' 1;Z,... � IIMia7tr- -ill�1Nl44lll7llll1■l!1;dab ellR - 1 ' .QrOsVtr.,i` i . t l �-- r o-, �liaPQA.'a'tt•n, ro!ieylGr�a prRtle 203 • -250-- CONTAINER PLANTING • ., 0 20 40 60 SCALE IN FEET . i ./- „.- ..-' /i i z z • i z i i / �• i• EVCAVATE HOLE 2( LARGER THAN CONTAINER OR NATURAL ROOT SPREAD ROUGHEN SIDES OF PLANTING NOTE BURY TRUNX/STEM NO DEEPER THAN NURSERY LEVEL CREATE r emcee AROUND PLANE STAKING NOT RECOMMENDED BARE -ROOT PLANTING ADOLFSON ASSOCIATES. INC. NOTE: For tree Planting/Staldng Detail, see standard plan. OTREE/SHRUB PLANTING DETAIL SECTION NO SCALE -PUBLIC WORKS DEPT. -ENQINEER1 A ARKS-BUILDINGl- by date designed HJJ 6/95 drawn 0 4 6/95 checked SEW 6/95 Prof eng pro dir efd bk no ©©nogHanne PerEeet E' ngineering INCORPORATED Civil and Transportation Consultants 2823 Colby A.enue • Site 4*. E.eretL WA 9820) -(206) 232.7233 CITY OF TUKWILA GILLIAM CREEK PLANTING PLAN - UPPER REACH freslwq i; oat= now, no dote revisions Me no r scab date PLANT SCHEDULE SYMBOL SCIENTIFIC NAME COMMON NAME QUANTITY SIZE Trees: 8 S Q CO CD•S Co -5 Shrubs: A // Betula papyrifera Picea sitchensis Populus tremuloides Thuja piicata Thuja plcata Thuja pficata Acer circinatum Berberis nervosa Cams stolonifera Corylus comuta Polystichum munitum Rubus spectabilis Symphoricarpos elbus Vaccinum parvifolium Paper birch SiIke spruce Quaking aspen Westem red cedar Westem red cedar Westem red cedar Vine maple Cascade Oregongrape Red -osier dogwood Hazelnut Sword-fem Salmonbeny Common snowbeny Red huddebeny Seed: Apply 400/acre to all areas of disturbed sal. Bedunannia syzigachne American slough grass Deschampsia oespitosa Tufted hairgrass Northwestern manna grass Glyceria occidentalis Abbreviations: gal.. gallon wt. = weight 13 15 4 7 3 2 1 gal. 1 gal. 1 gat 1gat 3 gal. 5 gal. 18 1 gal. 30 4' pot 7 1 gal. 10 1 gat 48 1 gal. 30 1 gal. 19 1 gal. 28 1 gal. 40% by wt. 40% by wt 20% by wt. GENERAL NOTES 1. This planting plan is designed to replicate natural plant communities in species composition and arrangement Even spacing and straight -row planting are not desired. 2. Plant locations are based on anticipated sod and sun conditions after grading and soil preparation activities are completed. Planting locations may need to be adjusted per actual field conditions. 3. Most trees will be planted in areas of dense blackberry shrubs. Prepare a planting area fa each tree by removing blackberry canes, vines, grasses, and other invasive plant material within a 6' diameter circle for each tree (low growing herbs may remain). Pit plant each tree and shrub per the planting detail (Sheet 2). 4. Alt plant material shall be nursery -grown stock. 5. ;The Contraeoorisrequked.to,provide. some type of staking or marking system to assist the Layout, plahtng, and final approval activities. 6. Bareroot plant stock may be used where seasonally available, and generally must be installed during the dormant season (approximately October 31st through April 1st). 7. Depending on the availability of natural rainfall, the landscape contractor may need to provide supplemental watering to ensure reasonable plant survival (*reasonable plant survivar will be judged by vegetative cover of growing. native plant species). 8. Small minimum plant saes are specified to increase plant survival by reducing transplant stress. Larger plant saes will be acceptable C requested by the property owner and providing the landscape contractor assures equal or better survival rates. 9. Plant procurement, transport, storage, handing, planting techniques, care of existing soil and vegetation, and watering are to be performed per landscape industry standards. 10. Method of grass seed application may be chosen by the landscape contractor. 11 by hydroseedng, avoid spraying seed mixture on branches and leaves of trees, shrubs, and herbs. SW 1/4, SEC 22, TWP. 23N, RGE. 4E 0 20 40 60 SCALE 81 FEET TREE REPLACEMENT CHART SIZE . QUANTITY REPLACE MITIGATION lomm.) I REMOVED RATIO QUANTTTY 4" -Er 2 1 2 e'-12" . 1 7 2 14 »12"-18' ! 2 4 a TOTALS: 11 24 NOTE Clearing limits are to the cut or fill lines as shown. EASEMENT i ‘1.1111 1111.1 1188,1, t. ss r , , r ;,r • i 0 '0 ;I • i :�h: • • Q '05 teffif N ,; /. ,% ;0 0 Z N; MATCH LINE 14*50 r>i / NOTE: BASE INFORMATION SHOWN TO ASSIST PLANTING OPERATIONS ONLY. DO NOT USE THIS SHEET FOR GRADING/CONSTRUCTION PURPOSES. / 1908 PUBLIC WORKS DEPT. —ENGINE ERIN A ARKS—BUILDINQ— by designed dote drawn checked proj eng 'raj der rest bk no conoaEltRaniRo PerEeet Engineering INCORPORATED Civ 1 and Transportation Consultants 2828 Coby Mea. 4 Site 4S -Everett. WA 98201.1206) 252-7233 CITY OF TUKWILA GILLIAM CREEK PLANTING PLAN - LOWER REACH leov FL04411N4 L4t.cf.loW.; /0k no dote revisions Me no scale date r