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Permit L94-0060 - CITY OF TUKWILA - DUWAMISH RIVER TRAIL SHORELINE SUBSTANTIAL DEVELOPMENT
L94 -0060 shoreline CITY OF TUKWILA STATE OF WASHINGTON DEPARTMENT OF ECOLOGY Northwest Regional Office, 3190 - 160th Ave S.E. • Bellevue, Washington 98008 -5452 • (206) 649 -7000 December 8, 1994 City of Tukwila Parks and Recreation Department 6200 Southcenter Blvd. Tukwila, WA 98188 Dear Sirs: Re: City of Tukwila Permit #L94 -0060 City of Tukwila - Applicant Shoreline Substantial Development Permit #1994 -NW -10038 The subject Shoreline Management Shoreline Substantial Development Permit has been filed with this office by the City of Tukwila on December 17, 1994. The development authorized by the subject permit may NOT begin until the end of the appeal period on January 6, 1995. You will be notified in writing if this permit is appealed. Other federal, state, and local permits may be required in addition to the subject permit. If this permit is NOT appealed, this letter constitutes the Department of Ecology's final notification of action on this permit. Robert J. Fritzen Shorelands Specialist Shorelands c* n.1 CoasLml Management Program RF:rf RECSDP.WP cc: City of Tukwila, Dept. of Community Development RECEIVED DEC 0 9 7994 CUrvttvs ;.. FVELOPh4Er,1 r S,h ine Management Act of 19 PERMIT FOR SHORELINE MANAGEMENT SUBSTA F i l e Number: Status: Applied: E;pproved : EWration: L94 -0060 APPROVED 08/04/1994 11/22/1994 11/30/1997 'ur:uant to RCW. 90.58, a permit is hereby granted C(TY OF TUKWILA :o undertake the fo11owin e.ve;lo' meaai::' BI NK STABILIZATION TO INC d:LUDC•'THE USE OF "RIP„RAP,�`, , ' At D VEGETATION GENER:AaY' "LOCATED .,ALONG THE GREEN102 , R) VER AT THE EASJ ENO''OF ,SOU,T�-ICENlTER $BOIULEVARD �```+ � ` `IAL DEVELOPMENT to: spot the follow�ir)g�pr9perty:�: A( dress: ,,. �ti� .„ .. „ :'are el No: 35:9100, 02,8 �, .. ' ,/ 2;4 /:2 3'/'4, "s � „1 r' r x sec. Twr /Rnge: W � °' r THE, TROPO,SED PROJECT'�W`ILL BE WITHIN THE AREA OF THE��yy�GREEN'' RIVER ANO cITS ASSOCIATED WETLANDS,, WHICH IS A SHORELINE OF STATEWIDE �-.�. r e.ti, t 1.....�� d, ,MI'r''Q ' 1 SSI'.GNIFI.CANCE,'AND IS z DESIGNA,TED•� AS_AN URBAN ENVIRONMENyTL . .:; ‘(he following%master progrm,provisionsare/ pp i cab 1 e to this development: IT\ O U:WILA SHORELINE J i iA'” i E RP.L'rA(Nr j )evt 1 opment pu,rs,uan,t to this permit sha 1 1 the rrun!der� taken pursuant o the attacheeikt`erm"a�`nd conditions. '"n- 4',,-* �° • F t --' Thi. permit,; is,, ranted pursuant to the S'hone1 in`e,, Managemen't'T A,,ct 1971 an lot ing inthis permitc� shall excuse jthe'apOli,cant `#,rom complian$ with any ith •r Fede,ra�1, State o '. Iocal statutes, ��or>djnan;ces, or regulat�tiita s app ,cable to this ;pro_j ectP;,� but not `i ncons i stent ,<;wi th ;µth`e Sho:re'�I'i ne Man gement Act :Chap't`er 90. 58y -RCW) . '' S 's { ''�j rhi permit ma> e escinded pursuant to RCW 90.58.140(8Y /41;1" n the event the per �ittee fails to, comply with thetermsor conditipns,he,reof. :. C INSTRUCTION PURSUANTJO THIS PERMIT,WILL NOT.•BE.GI;NeOR IS NOT AUTHORIZED U ITIL THIRTY (30) DAYS` FROM "THE- :DATE,.OF _FILIIN:G: WITH THE DEPARTMENT OF E 'OLOGY AS DEFINED IN RCW X30: =58 ..1'4.O G5)� Af!1D 'WPIC 173 -14 -090, OR UNTIL ALL R VIEW PROCEEDINGS INITIATED WITHIN-THIRTY DAYS FROM THE DATE OF SUCH F LING AVE TERMINATED; EXCEPT AS PRO . y'IN RCW 90.50.140(5)(a)(b)(c). rat - - /�� -411— 01 ector, Planning Department L. Rick Beeler :on truction or substantial progress toward construction must begin within two years from date of issuance, per WAC 173 -14 -060. - CITY OF TUKWI.LA Ad cress: suite: T 'nan`t : Type: P -SHORE Par;e1 #: 359700 -0282 Permit No: L94 -0060 Status: APPROVED Applied: 08/04/1994 Issued: 11/22/1994 * *k kh**•k**** * *******•k****** k******h***.k***** ***** ************k***** * * ** * *k* Permit Conditions: ��_�,- �,,.,� " " '��� HEu END AND AROUND 1 6 -8 QUARRY SPACES SHALL -740. PLACED` 47, -�T, THE NEW GEOGRID. -----.....;;Mfr,-....,,,, 2 THE LARGE WOODY QEBR�ItS SHALL ;BE PLACED IN THE:�R'IER ACCORD- ING TO THE DETA` ' R'SUBMI1,TTEDr`i WITH THE FOLLOWING �Ct NGES : A. TRUNK DIfbETER (SHALL`t =BE •NO�.GREATER THAN /18 " "°` B; ROCKMMING TRUNK``F'IN` PLACE SHALL BEr "F;BOM 4:00 TO} 1,200 3 TWO LARGE ,,S�HAD?NG^ TREES. PLANTED ;�3,0 FEET ON' ��CENT R�, 'S ,� . <a `'� fir. � � Ft'' REQUIRWONDE ECTIQN 18.44' 13d (1,) (C) TMC; oNEED NOT..,BE' PLANTEb. WITH. THEE RECONSTRU�CTIPN OF :THE BANK, BUT MUST' BE INCORPORATED,, INTO,�r51�HE LANDSCAPING OF THIS AREA AND PLANTED WITH /THE CONSTRUCTION.O1 THE'R.IVER 'TRAIL 6 9• .A t 4k' • . ' 1 j 'w4kri t Fl A F F I D A V I T • O F D I S T R I B U T I O N I� Inez Lambert hereby declare that: 0 Notice of Public Hearing fl Determination of Non - significance a Notice of Public Meeting O Mitigated Determination of Nonsignificance O Board of Adjustment Agenda O Determination.'of Significance Packet and Scoping Notice O Board of Appeals Agenda Packet fl Notice of, Action planning Commission Agenda Q Official Notice Packet O Short Subdivision Agenda fl Other' Packet O Notice of Application for E Other Shoreline Management Permit Shoreline. Management Permit was mailed to each of the following 'addresses on 12- 5 -94'-' Distribution: .Washington Dept. of Ecology (Shoreline Permit Reviewer). •Muckeleshoot Indian Tribe Washington State Attorney General Mayors Office• City Cle'ks office Friends of the Duwamish Property Owner (City of Tukwila -Parks and Recreation) File 0 Faxed: Seattle Times (Publication 12 -9 -94 and. 12- 16 -94) Name of Project River Bank Stabilization Signaturelet File Number L94 =0060 • • . HOMEWOOD SUITES 6915 SOUTHCENTER BOULEVARD TUKWILA WA 98188 • FORT DENT II 6840 SOUTHENTER BLVD TUKWILA WA 98188 • A F F I D A V I T O F D I S T R I B U T I O N I, ROBIN R STANLEY hereby declare that: jJ Notice of Public Hearing O Notice of Public Meeting LJ Board of Packet Board of Packet Planning Adjustment Agenda Appeals Agenda Commission Agenda O Determination of Non - significance 0 Mitigated Determination of Nonsignificance Determination of Significance and Scoping Notice Notice of Action fl Of f icial Notice Packet fl Short Subdivision Agenda fl Other Packet XX)@Notice of Application for 0 Other Shoreline Management Permit fl Shoreline Management Permit was mailed to each of the following addresses on 8/29/94 MAILED TO FRIENDS OF DUWAMSIH MAILED TO MUCKELSHOOT INDIAN TRIBE MAILED TO DEPT. OF ECOLOGY MAILED TO ADJACENT PROPERTY OWNERS SENT TO THE MAYORS OFFICE SENT TO CITY CLERKS OFFICE SENT TO PUBLIC WORKS SENT TO GARY SCHULZ SENT TO THE PARKS & REC. DEPARTMENT Name of Project GREEN RIVER File Number L94 -0060 NOTICE OF APPLICATION FOR SHORELINE MANAGEMENT SUBSTANTIAL DEVELOPMENT PERMIT ACTIVITY #: L94-0060 NOTICE IS HEREBY GIVEN that CITY OF TUKWILA of the below described property has filed an application for a SHORELINE SUBSTANTIAL DEVELOPMENT permit for the development of: BANK STABILIZATION TO INCLUDE THEUSE-OF,RIPRAP AND VEGETATION GENERALLY LOCATED ALONG THE 'GREEN y . RIVER AT THE EAST END OF SOUTHCENTERBOULEVARD.,. LOCATED within the 24/23/4 in Tukwila, King County, Washington. Said .development is proposed to be within 200 feet of the Green River/DuWamishand/or it associated Agie0'ands. Any person desiring to express his views or to be notified of the action taken on this application should notify SHEFRIN,DENNI DEPARTMENT OF COMMUNITY DEVELOPMENT, PLANNING DIVISION, CITY OF TUKWILA', 6300 SOUTHCENTER BOULEVARD, SUITE 100, TUKWILA, WASHINGTON 98188, in : writing his interest within 30 (thirty) days of the final date of publication of this notice which is Sep 09, 1994. Written comments must be received by Oct 09, 1999 Published in : Seattle Times Sep 02, 1994 2nd Publication: Seattle Times - Sep 09, 1994 • • • • • • • • jC Distribution: City Clerk, Mayor, Adjacent Property Owners, Department of Ecology, Property Owner, File City of Tukwila John W. Rants, Mayer Department of Community Development Rick Beeler, Directs r November 9, 1994 SHORELINE SUBSTANTIAL DEVELOPMENT PERMIT File: #L94 -0060, SEPA #L94 -0059 Request: Shoreline Substantial Development Permit request to stabilize approximately 50 lineal feet of eroding riverbank on the Duwamish -Green River using riprap and vegetation. A construction access road, measuring 20 feet in width, and 240 feet in length, is also proposed. This road will lead from Southcenter Boulevard to the river bank. Location: The project is located on the west bank of the Duwamish -Green River, adjacent to Fort Dent, in the 6800 block of Southcenter Boulevard, in the west half of Section 24, Township 23 N, Range 4 E, in the City of Tukwila, Washington. Shoreline Designation: The project lies within the Tukwila Shoreline area, and the subject shore area is designated as an Urban Shoreline. CRITERIA Shoreline of State -Wide Significance. The Green River is considered a shoreline of state -wide significance, adhering to the following principles: 1. Recognize and protect the state -wide interest over local interest. 2. Preserve the natural character of the shoreline. 3. Result in Tong -term over short-term benefit. 4. Protect the resources and ecology of the shorelines. 5. Increase public access to publicly -owned areas of the shoreline. 6. Increase recreational opportunities for the public on the shoreline. All the Green River shoreline within the Tukwila Shoreline Master Program has been designated as 'Urban Environment`. The objectives of the Urban Environment is to utilize shorelines within urban areas by promoting public use and managing development for multiple use which enhances the shoreline environment. The 200 foot shoreline area is classified into three management zones as follows: River Zone: An impact buffer area which provides for resource protection, flood control maintenance, pollution control and landscape enhancement. This zone includes the first 40 feet from the mean high water mark. 6300 Southcenter Boulevard, Suite #100 • Tukwila, Washington 98188 • (206) 431-3670 • Fax- (206) 431-3665 Shoreline Substantial Development Permit #L94-0060, SEPA #L94 -0059 Low Impact Zone: High Impact Zone: Discussion A transition area intended to minimize physical and visual impact on the river zone while accommodating shoreline development. This 60 foot wide zone includes the area between 40 and 100 feet from the mean high water mark. An area to provide for more intensive use of the shoreline resource. This zone includes the area between 100 feet to 200 feet from the mean high water mark. River bank stabilization proposal are a permitted use within the 'Urban' Shoreline and the River Environment. The proposed bank stabilization project will provide protection of an existing river bank in preparation for construction of a public trail. As part of the project, native vegetation will be planted for slope stability, and woody debris will be provided for fish habitat. These will enhance the natural character of . the river. All bank stabilization work will take place within the 'River Zone'. The proposal meets the goals of state -wide significance. Shoreline Master Program Goals and Policies. Overall Goals and the Shoreline Master Program. The following are the general goals developed to express the intent of the Shoreline Management Act of 1971: 1. Promote reasonable and appropriate use of the shorelines which will promote and enhance public interest. 2. Protect against adverse effects against the public health, the land, its vegetation and wildlife and waters and their aquatic fife within Tukwila. 3. Protect public rights of navigation. 4. Recognize and protect private property rights consistent with public interest. 5. Maintain a high quality of environment along the shorelines of Tukwila. 6. Preserve and protect fragile natural resources and culturally significant features. 7. Provide safe and reasonable access for the public to the shorelines. 8. Recognize, protect, and improve aquatic habitats and spawning grounds oaf the Green River, which are invaluable natural resources. 9. Recognize, protect and improve those wildlife habitats which are valuable of resources of the State. 10. Encourage recreational activities unique to or dependent upon the use of the river which benefit the public interest. Shoreline Substantial Development Permit #L94-0060, SEPA #L94 -0059 Discussion The proposed project intends to stabilize a slope for future construction of a public trail. The proposed trail is a portion of the Duwamish -Green River trail which will eventually connect from Seattle to Auburn. The intention of the project in to stabilize an eroding bank with rip rapping and native plant species. The bank stabilization will protect the future public trail which will provide public access to the river. The proposed plantings will protect the slope and provide some habitat shading for the river. In addition, woody debris will be placed at the river edge, below mean high water to provide fish habitat, as recommended by the Department of Ecology. The proposed project meets the overall goals of the shoreline master program. Element Goals and Policies The following are goals and policies which specially address the proposed project. Public Access Element Goal 2. Assure that the intrusions created by public access will not endanger life, property or have adverse effects on fragile natural features. Policy 3. A trail system should be developed along the river. Discussion The project will repair an eroded bank and allow future construction of a public river trail. Recreation Element Policy 3. Those unique and fragile areas of the shoreline which cannot be maintained in a natural condition under human uses should be designed and maintained as open space for passive forms of recreation. Conservation Element Goal 2. Encourage the preservation of as much as possible of the natural character of the river and its shoreline. Goal 3. Encourage the protection of resources and ecology of the river and its shoreline. Discussion River bank stabilization is not, of course, the natural character of the Green River. However, the river has been contained by humans for many years for flood control purposes. The proposed bank stabilization project is not proposed for flood control, but rather to stabilize the bank for the future construction of a public river trail. Native plantings will be incorporated in the stabilization project. This public trail will provide open space and recreational opportunities along the river, while maintaining as natural a river character as possible. 3 ```, RIVER TRAIL BANK STABILIZATION Environmental Checklist August 1, 1994 Prepared for: City of Tukwila Parks & Recreation Department Tukwila, Washington Prepared by: KPFF Consulting Engineers. 1201 Third Avenue, Suite 900 Seattle, WA 98101 Control No. Epic File No. Fee RIVER TRAIL BANK STABILIZATION ENVIRONMENTAL CHECKLIST A BACKGROUND 1. Name of proposed project, if applicable: River Trail Bank Stabilization 2. Name of applicant: City of Tukwila Parks & Recreation Department 3. Address and phone number of applicant and contact person: Don Williams, Director City of Tukwila Parks & Recreation Department 6200 Southcenter Blvd. Tukwila, WA 98188 (206) 433 -1843 4. Date checklist prepared: August 1, 1994 5. Agency requesting checklist: City of Tukwila 6. Proposed timing or schedule (including phasing, if applicable): Estimated one month duration, with construction to begin approximately on October 1, 1994. 7. Do you have any plans for future additions, expansion, or further activity related to or connected with this proposal? If yes, explain. Receipt No.. RECEIVED AUG 3 1994 CUMMUNITY DEVELOPMENT A related project to this proposal is the connection of the Tukwila Trail a few hundred feet up and downstream from this project. The trail is to be located at the top of bank, thus requiring tho bank stabilization. 8. List any environmental information you know about that has been prepared, or will be prepared, directly related to this proposal. None. ENVIRONMENTAL CHECKLIST - PAGE 1 ...... ; °:: 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. 10. List any governmental approvals or permits that will be needed for your proposal. • Hydraulic Project Approval - WDF • SEPA Checklist - City of Tukwila • City Utility Permit - City of Tukwila • Flood Control Zone - City of Tukwila • Shoreline Substantial Development - City of Tukwila 11. Give a 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. The nature of the proposed improvements are to stabilize 'approximately 50 lineal' feet of eroding riverbank on the Duwamish -Green River using riprap and :vegetation. To perform this work, a temporary construction road will be required to get crews and equipment to and from the adjacent parking lots. 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 location of the eroding riverbank is on a south portion of the Duwamish -Green River adjacent to the Fort Dent 2 site, Section 24, Township 23 N, Range 4 E. The address for Fort Dent 2 is: 6840 Southcenter Blvd. Tukwila, WA 98188 13. Does this proposal lie within an area designated on the City Comprehensive Land Use Policy Plan as environmentally sensitive? Yes, the riverbank is designated as environmentally sensitive. ENVIRONMENTAL CHECKLIST - PAGE 2 B. ENVIRONMENTAL ELEMENTS 1. Earth a. General description of the site (circle one): Flat, rolling, hilly, steep slopes, mountainous, other: The area surrounding the river is generally flat, but the project involves stabilizing a steep slope that is sloughing along the riverbank. b. What is the steepest slope on the site (approximate percent slope)? 60% 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. Fine sands and silty sands. d. Are there surface indications or history of unstable soils in the immediate vicinity? If so, describe. Yes, a few hundred feet upstream of this location, a similar bank slough occurred and was repaired with quarry spalls and riprap. e. Describe the purpose, type and approximate quantities of any filling or grading proposed. Indicate source of fill. Two hundred cubic yards of quarry spalls and riprap backfill to be placed to approximately 2 feet above ordinary high water mark, and quarry spalls and gravel borrow above that point to match the existing bank. f. Could erosion occur as a result of clearing, construction or use? If so, generally describe? Yes, erosion could occur during construction because of the . temporary : removal:: of vegetation. 9. About what percent of the site will be covered with impervious surfaces after project construction (for example, asphalt or buildings)? None. ENVIRONMENTAL CHECKLIST - PAGE 3 Evaluation for Agency Use Only h. Proposed measures to reduce or control erosion, or other impacts to the earth, if any: The nature of the project is to prevent any more erosion of the slope into the river. During construction, appropriate erosion control measures will be used to minimize any unnecessary erosion. 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, minimal construction vehicular exhaust and dust emissions will occur. After completion, no emissions to the air should result. b. Are there any off -site sources of emissions or odor that may effect your proposals? If so, generally describe. No. c. Proposed measures to reduce or control emissions or other impacts to air, if any: Utilize appropriate BMP's to minimize emission and dust. Such BMP's may include, but not limited to, minimizing exposed surfaces, sweeping the parking lots, and spraying water on exposed surfacing. 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. 2 Adjacent to the project is the Duwamish -Green River. 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, the project requires stabilizing an existing bank that is currently sloughing into the river. ENVIRONMENTAL CHECKLIST - PAGE 4 Evaluation for Agency Use Only : > 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. Fifty cubic yards of excavation will be required to key the rock material into the bank. 4) Will the proposal require surface water withdrawals or diversions? Give general description, purpose, and approximate quantities, if known. No. 5) Does the proposal lie within a 100 -year floodplain? If so, note location on the site plan. Yes. 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. None. Evaluation for Agency Use Only ENVIRONMENTAL CHECKLIST - PAGE 5 c. Water Runoff (including stormwater) 1 ) Describe the source of runoff (including stormwater) 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. Stormwater runoff will sheet flow down the embankment into the Duwamish -Green River. Any runoff from the construction driveway will be collected by existing catch basins in the parking lot. 2) Could waste materials enter ground or surface waters? Is so, generally describe. Waste or toxic materials could enter surface water during construction as a result of an equipment malfunction or accidental spill which releases diesel fuel, hydraulic fluid or lubricants. d. Proposed measured to reduce or control surface, ground and runoff water impacts, if any: The proposed project will enhance water quality to the surface water by eliminating any more bank erosion. 4. Plants a. Check or circle types of vegetation found on the site: deciduous tree: alder, maple, aspen, other 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? Three hundred square yards of tall grass and black berry bushes for both the bank stabilization and the temporary construction road will be removed and replaced after construction. List threatened or endangered species known to be on or near the site. None. ENVIRONMENTAL CHECKLIST - PAGE ^.6 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: Native plants will replace all plants removed during construction of the project. 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: Canadian Geese. Crows, Robins mammals: deer, bear, elk, beaver, other: Deer fish: bass, salmon, trout, herring, shellfish, other: Salmon 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. The Green River is a spawning route for local salmon coming from the Puget Sound. d. Proposed measures to preserve or enhance wildlife, if any: Eliminating bank erosion should enhance fish migration upstream. 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. None. 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. ENVIRONMENTAL CHECKLIST - PAGE 7 Evaluation for Agency Use Only 7. Environmental Health Evaluation for Agency Use Only 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, see B.3.c.2. 1 ) Describe special emergency services that might be required. 2 b. Noise None. Proposed measures to reduce or control environmental health hazards, if any: None. 1 ) What types of noise exist in the area which may affect your project (for example: traffic, equipment, operation, other)? 2 None. What types and level 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. During construction, there will be noise from construction equipment. Normal working hours will be from 7:00 a.m. to 7:00 p.m. Heavy construction equipment includes trucks hauling construction materials, backhoe for earth excavation, and bull dozer for clearing and grubbing. 3) Proposed measures to reduce or control noise impacts, if any: Contractor will abide by the City of Tukwila's Noise Ordinance. 8. Land and Shoreline Use a. What is the current use of the site and adjacent properties? Current use of the site is a riverbank surrounded by commercial businesses. ENVIRONMENTAL CHECKLIST - PAGE 8 b. Has the site been used for agriculture? If so, describe. No. c. Describe any structures on the site. None. d. Will any structures be demolished? If so, what? No. e. What is the current zoning classification of the site? Regional Retail. f. What is the current comprehensive plan designation of the site? g. Commercial. If applicable, what is the current shoreline master program designation of the site? Urban. h. Has any part of the site been classified as an "environmentally sensitive" area? If so, specify. Yes, with this project being on the Duwamish -Green Riverbank, it is environmentally sensitive. i. Approximately how many people would reside or work in the completed project? None. Approximately how many people would the completed project displace? None. k. Proposed measures to avoid or reduce displacement impacts, if any: N/A I. Proposed measures to ensure the proposal is compatible with existing and projected land uses and plans, if any. The project is a maintenance issue to protect the current and projected land uses. ENVIRONMENTAL CHECKLIST - PAGE 9 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. None. b. Approximately how many units, if any, would be eliminated? Indicate whether high, middle, or low- income housing. None. c. Proposed measures to reduce or control housing impacts, if any: None. 10. Aesthetics a. What is the tallest height of any proposed structure(s), not including antennas; what is the principal exterior building materials(s) proposed? None. b. What views in the immediate vicinity would be altered or obstructed? None. c. Proposed measures to reduce or control aesthetic impacts, if any: None. 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 Tight or glare may affect your proposal? None. Evaluation for Agency Use Only ENVIRONMENTAL CHECKLIST - PAGE 10 d. Proposed measures to reduce or control Tight and glare impacts, if any. None. 12. Recreation a. What designed and informal recreational opportunities are in the immediate vicinity? Within a quarter mile to the northwest of the site is a City Park with baseball and soccer fields. 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. 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. N/A 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 project is accessed by Southcenter Boulevard. Within a half mile of the site, Southcenter Blvd. intersects Interurban Avenue in close proximity to access ramps for 1 -405. ENVIRONMENTAL CHECKLIST - PAGE 11 .^..' Evaluation for Agency Use Only b. Is site currently served by the 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? None. 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. g. None. Proposed measures to reduce or control transportation 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. 16. Utilities a. Circle utilities currently available at the site: electricity, natural gas, water, refuse service, telephone, sanitary sewer, septic system, other. N/A ENVIRONMENTAL CHECKLIST - PAGE 12 Evaluation for Agency Use Only 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. None. 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: ed,k441e e./ 4, Don Il / //4#7.r Date Submitted: 8-1-9? Please continue to the next page. Evaluation for Agency Use Only ENVIRONMENTAL CHECKLIST TO BE COMPLETED BY APPUCANT Evaluation for Agency Use Only D. SUPPLEMENTAL SHEET FOR NON- PROJECT 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 implemented. 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? Construction may result in an increase to all of these concerns, except production and storage which will not occur. The completed project will not affect the existing conditions. Proposed measures to avoid or reduce such increases are: During construction, the contractor will use all available means to minimize the impacts associated with the project (see B.2.c, B.3.d and B.7.b.3). 2. How would the proposal be likely to affect plants, animals, fish, or marine life? During construction, there may be a negative impact on plants, animals and fish, but once complete, the project should enhance fish habitats while plants and animals will quickly return to the existing conditions. Proposed measures to protect or conserve plants, animals, fish, or marine life are: All vegetation removed will be replaced immediately after_:; construction with native plants. The temporary elimination, of plants will be kept to a minimum. 3. How would the proposal be likely to deplete energy or natural resources are: N/A Proposed measures to protect or conserve energy and natural resources are: None. ENVIRONMENTAL CHECKLIST - PAGE 14 TO BE COMPLETED BY APPLICANT Evaluation for Agency Use Only 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? The project will restore the riverbank to its pre - failure state to preserve existing landscaping and fish migration. Proposed measures to protect such resources or to avoid or reduce impacts are: Design and construction will be in compliance with all rules and regulations of the Washington Department of Fisheries, Army Corps of Engineers and the City of Tukwila. 5. How would the proposal be likely to affect land and shoreline use, including whether it would allow or encourage land or shoreline uses incompatible with existing plans? By stabilizing the bank, the Tukwila Trail can be built on top of the bank as part of another related project proposed by the City —The Tukwila Trail Expansion. Proposed measures to avoid or reduce shoreline and land use impacts are: The stabilization of the bank will eliminate any more bank erosion at this location. How does the proposal conform to the Tukwila Shoreline Master Plan? This proposal does not conflict with the Tukwila Shoreline Master Plan. 6. How would the proposal be likely to increase demands on transportation or public services and utilities? During construction, two or three additional vehicles may use Southercenter Boulevard, but once the project is complete, no increases in transportation, public services or utility demands will occur. 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. None. ENVIRONMENTAL CHECKLIST - PAGE 15 TO BE COMPLETED BY APPLICANT Evaluation for Agency Use Only 8. Does the proposal conflict with policies of the Tukwila Comprehensive Land Use Policy Plan? If so, what policies of the Plan? No. Proposed measures to avoid or reduce the conflict(s) are: N/A E. SUPPLEMENTAL SHEET FOR ALL PROJECT AND NONPROJECT PROPOSALS The objectives and the alternative means of reaching the objectives for a proposal will be helpful in reviewing the foregoing items of the Environmental Checklist. This information provides a general overall perspective of the proposed action in the context of the environmental information provided and the submitted plans, documents, supportive information, studies, etc. 1. What are the objective(s) of the proposal? To stop the ongoing erosion of the bank into the river and to construct a stable riverbank at this location. 2. What are the alternative means of accomplishing these objectives? Alternatives include the placement of gabion walls and /or permanent geogrids to stop the erosion. 3. Please compare the alternative means and indicate the preferred course of action? Both gabion walls and geogrids are more costly and neither one will support the growth of vegetation. By placing additional fill with quarry spells and riprap in the sloughed area, vegetation can be planted that will not only help in preventing more erosion, but also provide a more natural appearance to the bank. 4. Does the proposal conflict with policies of the Tukwila Comprehensive Land Use Policy Plan? If so, what policies of the plan? No. Proposed measures to avoid or reduce the conflict(s) are: N/A ENVIRONMENTAL CHECKLIST - PAGE 16 RZA AG RA, Inc. Engineering Environmental Services 14 July 1994 Hough Beck & Baird, Inc. Lenora Square 100 Lenora Street, Suite 516 Seattle, Washington 98121 -2725 Attention: Ms. Colie Hough -Beck, ASLA Subject: Summary of Site Reconnaissance Proposed Tukwila Duwamish Green River Trail Tukwila, Washington Dear Ms. Hough -Beck: 11335 NE 122nd Way Suite 100 Kirkland, WA 98034 -6918 (206) 820 -4669 FAX (206) 821 -3914 11-09731-00 RECEIVED P6 10 COMMUNITY DEVELOPMENT Presented herein is a summary of the geotechnical reconnaissance we completed along the proposed route of the Tukwila Duwamish Green River Trail in Tukwila, Washington. This letter describes our observation of river bank conditions along the proposed trail route, and presents general recommendations regarding site drainage and monitoring. The purpose and scope of our reconnaissance were discussed during our 12 July 1994 meeting with representatives of Hough Beck & Baird, and the City of Tukwila Parks Department and Public Works Department. The purpose of reconnaissance was to observe conditions along the proposed trail route in order to assess potential areas of erosion or slope instability which could impact construction and utilization of the trail along the river. We also observed slope and soil conditions in order to provide assistance to the project designers in regard to surface water drainage. Authorization to proceed with this study was provided by Ms. Colie Hough -Beck on 12 July 1994. A preliminary set of the plans for the trail project were made available for our use. The plan set, dated 12 July 1994, included Sheets L -1, L -2, and L -7 through L -15, at a scale of 1 inch equal to 20 feet. The proposed trail consists of several sections which are intended to "fill in" between existing riverside trails or pathways. The largest portion of the trail extended from the northeast dead end of 48th Avenue South (48th Avenue South terminates at the Duwamish River) in the downstream direction to a point approximately 100 feet southeast of the southeast end of the 42nd Avenue South bridge over the Duwamish River. This portion of the proposed trail consisted of an existing gravel covered path, thickly vegetated undeveloped areas, as well as an existing sidewalk which will be incorporated into the trail. We also observed a shorter section of the trail route proposed to border the Green River in an area located southwest of the Black River Quarry and southeast of Fort Dent Park. This 0 AGRA Earth & Environmental Group Hough Beck and Baird, Inc. 14 July 1994 11-09731-00 Page 2 section of the trail will connect two existing developed trails along the river, one located on the Homewood Suites property to the east, and the other located on a commercial development to the west. This location is described as the Fort Dent office park. An engineering geologist from our firm conducted the field reconnaissance on 13 July 1994. The reconnaissance consisted of walking most of the proposed trail alignment, observing conditions along the route and on the adjacent sideslopes extending down to the rivers. Low water levels afforded the opportunity to walk along the toe of the river bank at many locations. A combination of steep slopes and extremely thick vegetation necessitated viewing slope conditions from the far side of the river along the Boeing Credit Union property and a portion of the Fort Dent office park. Measurements were made of the significant erosional features we observed, and the entire river bank was photographed. Our observations are described below. Reference to trail route stationing is presented where applicable. FORT DENT OFFICE PARK (PLAN SHEET L -1) The short section of trail in the Fort Dent office park extended approximately 620 feet along an inside curve of the Green River. This portion of the trail will connect existing trails located at the Homewood Suites development to the southeast and the Fort Dent office park to the west. This portion of the trail route was thickly vegetated with grasses, blackberry bushes, alders, and cottonwood trees. Evidence of past earthwork activity was observed as the topography was hummocky in the area near the Fort Dent office park. Our observations lead us to conclude that the river bank sideslopes adjacent to the proposed trail location are generally stable, but will be susceptible to erosion by flowing surface water. We did observe localized oversteepened and near - vertical sections up to 2 feet in height along the upper break in slope. These locations were typically noted between Station 10 +00 and approximately Station 11 + 50. Below the near vertical slope break, the sideslopes were estimated to have an inclination of approximately 1 H:1 V (Horizontal:Vertical). The sideslopes were well - vegetated at most locations. An ADS drain pipe was observed on the slope at approximately Station.10 +75. We did not observe water flowing from the pipe. The thick vegetation above obscured any evidence of past trench work. An erosional scar was observed between Stations 11 +50 and 11 +80. This feature, which we understand has already been identified and is currently being considered by the project design, was manifested as a steep sided ravine -like feature which increased in depth from the southwest to the northeast. AGRA Earth & Environmental Group Hough Beck and Baird, Inc. 14 July 1994 11- 09731 -00 Page 3 The toe of the slope at approximately Station 13 +30 contained a mound of soil debris which appears to have sloughed from the slope above at some time in the past. The mound was partially vegetated. The slope above the mound was well- vegetated, also. Sediment deposition has occurred in the bend of the river centered at approximately Station 13 + 50. The creation of a point bar this location serves to reduce potential toe of slope erosion at low river levels and velocities. Soils observed in exposures along the trail in the Fort Dent area consisted of silt and silty sand mixtures. It should be noted that these soils are highly susceptible to erosion by flowing water. 48th Avenue South to Sammis Property (Plan Sheets L -7 through L -11) This portion of the proposed trail follows a meandering portion of the Duwamish River for a distance of approximately 2,778 feet. The alignment follows a route which extends westward from the 48th Avenue South dead end at Station 20 +85, and terminates at the existing sidewalk located at the eastern side of the Sammis property. This interval includes an established gravel pathway, undeveloped and highly vegetated river bank areas adjacent to the Boeing Credit Union property, the Boeing property, and the existing business development located to the west. A 24 -inch diameter CMP was located on the river bank slope immediately north of the 48th Avenue South dead end. Some erosion of the slope below was apparent, as a vertical section of bank has been created by water discharging from the culvert. We do not consider this erosion to be significant enough to affect plans for the trail. We do recommend that the erosion in this area be monitored in the future. The gravel covered pathway extended from approximately Station 20 + 85 to Station 31 +00, a short distance east of the existing pump station location at approximately Station 31 +60. The pathway featured a compacted sand and gravel surface with numerous depressions which are interpreted to contain ponded water after periods of rainfall. The adjacent river bank typically consisted of a 1.5H:1 V to 2H:1 V sideslope extending downward either to the river, or to a terrace area locally as much as approximately 10 feet wide, before extending downward to the river. The sideslopes were generally well- vegetated and did not exhibit evidence of significant erosion or slope instability, except as noted below. Evidence of preferential surface water flow over the.sideslopes adjacent to the existing gravel path was observed at approximate Station locations of 25 + 60, 28 + 75, and 30 + 65. We have interpreted conditions at these locations to indicate that surface water periodically flows from the path in a concentrated form. These areas also appear to probably be used as river AGRA Earth & Environmental Group Hough Beck and Baird, Inc. 14 July 1994 11- 09731 -00 Page 4 bank fishing spots. While some of the vegetation disturbance and soil exposure may be resultant from foot traffic in the area, we believe that periodic surface water flow is leading to the erosion observed at these locations. We observed the soils along the bank at these locations to consist of fine sand and silty fine sand in a loose to medium dense condition. These soils should be considered extremely susceptible to disturbance by flowing water. The toe of the slope along the river at these locations varied from very gently sloping to vertical exposures up to approximately 18 inches high. That portion of the trail sideslope between approximately Station 31 +00 and the Boeing Credit Union property, located at approximately Station 35, featured a somewhat variable sideslope estimated to range from approximately 1.5H:1 V to 2H:1 V. Undercutting of the sideslope immediately adjacent to the river was evident along this location, but we would not consider it extreme. Vegetative cover in this area was very well established and is probably contributing to the stable banks at this location, in our opinion. The Boeing Credit Union property extends along the proposed trail alignment from approximately Station 35 to Station 43 +60. It would have been necessary to cut a substantial amount of brush along this portion of the sideslope in order to view slope conditions directly. We did not wish to do this on the Boeing Company private property. Consequently, we viewed the bank from the toe of slope on the adjacent property, as well as from the opposite side of the river during low water conditions in the afternoon. We observed conditions to generally be consistent with those described in the 1989 Dames and Moore "Updated Riverbank Stabilization Study" report prepared for the Boeing Employees Credit Union project (Project No. 10863- 003 -016, April 24, 1989). The river bank slope in this area was well- vegetated, contained relatively uniform slope inclinations, and did not exhibit evidence of obvious slope instability or extreme erosion, based upon our observations. Another commercial development, described as "Parcel B" on plan sheet L -11, extended from approximately Station 43 +60 to the adjacent Sammis property located at approximately Station 48 + 63. The proposed trail location in this area was bordered by gentle slopes extending downward to a terrace area, in turn adjacent to the most gentle river bank slopes we observed. Some localized near - vertical soil exposures of limited height were observed near the eastern side of the development. However, the overall slope inclination decreased in the northerly direction. The slopes appeared stable and did not exhibit evidence of what we would consider significant erosion. We observed the condition of the slope area adjacent to the storm water outfall located at Station 48 + 15. A 36 -inch inside diameter concrete culvert was present at this location. Water flow from the culvert has eroded an area into the bank which was approximately 20 feet wide perpendicular to the river, and extended along the river for a distance of AGRA Earth & Environmental Group Hough Beck and Baird, Inc. 14 July 1994 11- 09731 -00 Page 5 approximately 15 feet. The erosional feature extended to a depth of approximately 4 feet below the end of the culvert. We observed some scattered rip rap located at the base of the erosional feature, as well on the slope above. This feature should not be considered one that poses an immediate threat to the stability of the hillside or the proposed trail, however. We recommend that it be considered for future monitoring and long term erosion mitigation as needed. A 6 -inch inside diameter concrete drain pipe was located on the western side of the erosional feature at approximately Station 48 + 24. We did not observe water flowing from the pipe while we were on site. Sammis Property to Station 0 + 00 (Plan Sheets L -11, 12, 13) The proposed trail route will follow an existing concrete sidewalk and asphalt paved vehicle access area located within the Sammis property commercial development. This portion of the proposed trail extends for a distance of approximately 1,350 feet west from the Boeing Credit Union property and meets a short interval of trail to be constructed starting at Station 0 +00 as shown on plan sheet L -13. Our reconnaissance of this area showed the sidesiopes adjacent to the river to be quite steep. We estimated inclinations to range from 1.5H:1V to 1 H:1 V, with localized vertical sections immediately adjacent to the river ranging from approximately 18 inches to 6 feet in height. Most of the slope along this area was well- vegetated. We observed apparent dumping of landscaping debris adjacent to the landscaped lawn area which was located south of the break in slope. Localized areas which apparently have been subject to downslope displacement of the landscaping debris, resulting in vegetation removal, were observed along the Sammis property. We also observed a small slump feature, the western limit of which was located approximately 40 feet east of Station 0 +00 as shown on plan sheet L -13. This feature, which was approximately 50 feet in width, was characterized as a small slump block with an approximate 2 foot vertical downset of the slope. The area was landscaped, however, and featured substantial grass growth in the downset area. This feature was bordered by a vertical section of bank extending down to the river. This vertical section measured approximately 6 feet in height. A toppled tree was present at this location, also. Two storm sewer outfalls were located along the river bank within the Sammis property. Some erosion of the soil at the base of the concrete wall below the easternmost outfall has occurred. Soil has been eroded from below the concrete to a depth of approximately 10 inches. The slope below the outfall was mantled with rip rap and appeared to be performing well, however. We observed an apparent leaking irrigation valve on the slope adjacent to the river located approximately 120 feet east of the easterly storm sewer outfall. The soil on the slope below the valve was saturated. AGRA Earth & Environmental Group Hough Beck and Baird, Inc. 14 July 1994 11-09731-00 Page 6 Western End of Project, Station 0 + 00 to Station 1 + 40 (Plan sheet L -13) The westerly section of the proposed trail extended primarily through a landscaped area and gravel surface area adjacent to the Sammis property. This portion of the trail was set back a greater distance from the break in slope than most of the other portions of the trail. We observed the adjacent sideslope to be heavily vegetated and featured an inclination ranging from approximately 1 H:1 V to 2H:1 V. The slope immediately adjacent to the river was generally free of vegetation and exhibited evidence of what we would consider moderate erosion. Several leaning tress were observed along this location. Overall, we would consider the river bank slope adjacent to this portion of the trial to be stable. CONCLUSIONS AND RECOMMENDATIONS The reconnaissance included direct visual observation of much of the alignment, as well as observing some areas from the far side of the river. It is our conclusion that the existing slopes adjacent to the proposed trail route currently present no unstable conditions which will prevent construction and utilization of the trail as proposed. The erosional feature noted between Stations 11 + 50 and 11 + 80 in the Fort Dent area will require repair, but we understand that this feature is a known entity which is being addressed by the current design. We described several locations where apparent surface water flow and /or foot traffic have resulted in erosion to sideslope soils. While these features should not be considered a problem in their present condition, their condition should be monitored subsequent to trail construction, in our opinion. These features, observed at approximate Stations of 25 + 60, 28 + 75, and 30 + 65, would be eroded further if concentrated surface water flow from the hard surfaced trail is directed over the slope at these locations. We recommend that surface water either be directed away from these areas, or that their condition be assessed as part of a regular monitoring program. We observed erosion of the river bank at location of the storm drain outfall located at the dead end of 48th Avenue South, and at the outfall located at Station 48 +15. We do not consider this erosion to present a problem to construction or utilization of the trail as planned, at this time. We recommend that the outfall areas be monitored at least once a year in order to assist in development of potential future repairs. It is our opinion that the practice of disposing of landscaping debris over the break in slope adjacent to the Sammis property development is one which will lead to accelerated erosion of the river bank with time. Landscaping debris absorbs moisture during the wetter times of the year, and the attendant weight increase can lead to downslope displacement of the debris, removing river bank vegetation in the process. This can lead to accelerated erosion of the river bank. We described above evidence of past episodes of downslope displacement of landscaping debris. We recommend that this practice be eliminated in order to reduce erosion AGRA Earth & Environmental Group Hough Beck and Baird, Inc. 14 July 1994 11- 09731 -00 Page 7 >. t,%,,A, VI; .,..."::^ i._*:. 1s= r! tt: 1a MY: klt�rt:r�� ^C•.i�'a -'txr. .. of the river bank. We recommend that the river bank along the Sammis property be monitored at least twice a year, paying particular attention to the oversteepened portions of the river bank. We observed only one location where significant downslope displacement of soil was obvious (not to be confused with downslope displacement of landscaping debris). The monitoring program should be geared such that a determination of downslope soil displacement or erosion is carefully made and evaluated relative to potential impacts to the City property. The monitoring program should ideally take place during the spring or summer when water flow is low, as well as in the wetter winter months along the Sammis property. Monitoring during low river levels allows direct visual observation of conditions at the toe of the slope. This is the location of most of the oversteepened portions of the slopes adjacent to the trail. Also, we recommend that the portion of the river bank slopes between the trail and the edge of the river be observed in order to detect areas where surface water flow may be eroding the sand and silty sand soils. These soils are extremely susceptible to erosion by flowing water. If left unchecked, erosion of these soils could lead to sufficient soil loss which would require more expensive repair efforts than those undertaken when the erosion is at an early stage, in our opinion. This reconnaissance was intended to identify conditions along the trail slopes on a single occasion. It should be recognized that gradual erosion of the river banks will occur with time, especially along the outside bends of the river. This is a natural process, and its progression should be monitored as part of regular maintenance activity conducted along the City's riverfront property, in our opinion. 0 AGRA Earth & Environmental Group, Hough Beck and Baird, Inc. 14 July 1994 11- 09731 -00 Page 8 We hope this letter meets your current needs. It has been our pleasure to assist you with this project, and we look forward to its successful completion. If you should have any questions, please do not hesitate to contact the undersigned at your convenience. Respectfully submitted, RZA AGRA, Inc. David C. Williams Associate John E. Zipper, Senior. Associate DCW /JEZ /clt [EXPIRES 1 / 24/ 9 '5"-- AGRA Earth & Environmental Group DEPARTMENT OF FISHERIES HYDRAULIC PROJECT APPROVAL R.C.W. 75.20.100 R.C.W. 75.20.103 n November 1, 1994 (applicant should refer to this date in all PAGE 1 OF 2 PAGES DEPARTMENT OF FISHERIES General Administration Bldg. Olympia, Washington 98504 (206) 753 -6650 correspondence) 10 LAST NAME FIRST 18 CONTACT PHONE(S) City Tukwila 433 -1843 4 NUMBER of (206) 01- A3101 -01 19 STREET OR RURAL ROUTE 6200 Southcenter Boulevard, ATTN: Don Williams 7 8 9 09.0001 CIXY STATE ZIP Tukwila WA 98188 14 17 MJATER TRIBUTARY.TO River Duwamish River 11 TYPE OF PROJECT Bank Protection 13 DARTER SECTION TOWNSHIP RANGE(E-W) COUNTY SECTION W1/2 24 23N 04E King TIME LIMITATIONS: 5 THIS PROJECT NAY BEGIN I 1 6 AND MUST BE COMPLETED BY November 15, 1995 Immediately THIS APPROVAL IS TO BE AVAILABLE ON THE JOB SITE AT ALL TIMES AND ITS PROVISIONS FOLLOWED BY THE PERMITTEE AND OPERATOR PERFORMING THE WORK. ON REVERSE SIDE OF APPROVAL riprap will with within dry. damaged a minimum. integrity water. angular its being shall face to a point two be covered with willow cuttings. the above time banks. of bank that will prevent rock or other washed away by shall be deposited, be placed from shall be ermitted can be confined to ext. 107 SEE IMPORTANT GENERAL PROVISIONS PROJECT DESCRIPTION: Place 100 linear feet of feet above high water. The remainder of the bank biodegradeble erosion control blanket and planted 1. Work on the toe shall occur during low tide limitations when the work can be done in the 2. Bank protection work shall be confined to 3. Watercourse encroachment shall be held to 4. The toe shall be designed to protect the protection material. 5. Bank sloping shall be accomplished in a manner the release of overburden material into the 6. Bank protection material shall be clean material of a sufficient size to prevent water action. 7. Overburden material resulting from this project so it will not to reenter the water. 8. Bank protection and filter blanket material the bank or a barge. Dumping onto the bank only if the toe is established and the material the bank face. SEPA: MDNS, City of Tuckwila, October 1994 REGIONAL HABITAT MANAGER - 76 Phil Schneider 206/775 -1311 PATROL - Boone 30 (P3) APPLICANT - WILDLIFE - READER - PATROL - HAB. MGR. - WRIA AN DEPARTMENT OF FISHERIES ARV 1 -/ ' ap / •IRECTOR THIS APPROVAL IS TO BE AVAILABLE ON THE JOB SITE AT, ALL TIMES AND ITS PROVISIONS FOLLOWED BY THE, FERMITTEE AND OPERATOR PERFORMING THE WORK THE PERSON(S) TO WHOM THIS APPROVAL. IS ISSUED MAY BE HELD LIABLE FOR ANY LOSS OR DAMAGE TO FISHLIFE OR FISH HABITAT WHICH RESULTS FROM FAILURE TO COMPLY WITH THE PROVISIONS OF THIS APPROVAL FAILURE TO COMPLY WITH THE PROVISIONS OF THIS APPROVAL COULD RESULT IN A CIVIL PENALTY OF UP TO ONE HUNDRED DOLLARS PER DAY OR A GROSS MISDEMEANOR CHARGE, POSSIBLY PUNISHABLE BY FINE OR IMPRISONMENT. ALL HYDRAULIC PROJECT APPROVALS ISSUED PURSUANT TO RCW 75.20.100 ARE SUBJECT TO ADDITIONAL RESTRICTIONS, CONDITIONS, OR REVOCATION IF THE DEPARTMENT OF FISHERIES OR DEPARTMENT OF WILDLIFE DETERMINE THAT NEW BIOLOGICAL OR PHYSICAL INFORMATION INDICATES THE NEED FOR SUCH ACTION. THE PERMITTEE HAS THE RIGHT PURSUANT. TO CHAPTER 34.04 RCW TO APPEAL SUCH DECISIONS. ALL HYDRAULIC PROJECT APPROVALS ISSUED PURSUANT TO RCW 75.20.103 MAY BE MODIFIED BY THE DEPARTMENT OF FISHERIES OR DEPARTMENT OF WILDLIFE DUE TO CHANGED CONDITIONS AFTER CONSULTATION WITH THE PERMITTEE: PROVIDED HOWEVER, THAT SUCH MODIFICATIONS SHALL BE SUBJECT TO APPEAL TO THE HYDRAULIC APPEALS BOARD ESTABLISHED IN RCW 75.20.130. THIS APPROVAL PERTAINS ONLY TO THE PROVISIONS OF THE FISHERIES AND WILDLIFE CODES. ADDITIONAL AUTHORIZATION FROM OTHER PUBLIC AGENCIES MAY BE NECESSARY FOR THIS PROJECT: APPEALS - GENERAL INFORMATION IF YOU WISH TO APPEAL DENIAL OR CONDITIONS OF AN HPA, THERE ARE INFORMAL AND FORMAL APPEAL PROCESSES AVAILABLE. A. • INFORMAL APPEALS: - AN INFORMAL APPEAL (WAC 220 -110 -340) CONSISTS OF CONTACTING THE REGIONAL HABITAT MANAGER AND DISCUSSING ?OUR CONCERNS. MOST PROBLEMS ARE RESOLVED AT THIS LEVEL, BUT IF NOT, YOU MAY ELEVATE YOUR CONCERNS TO THE. CHIEF OF THE HABITAT MANAGEMENT DIVISION IN OLYMPIA. THE HABITAT MANAGEMENT DIVISION CHIEF'S DECISION SHALL BE APPROVED OR DISAPPROVED BY THE DIRECTOR OR DESIGNEE. IF YOU ARE NOT SATISFIED WITH THE RESULTS OF THIS INFORMAL APPEAL, A FORMAL APPEAL MAY BE FILED. B. FORMAL APPEALS: 1) FOR ALL CIVIL PENALTY APPEALS AND FOR OTHER HPA APPEALS WHICH ARE NOT ASSOCIATED WITH IRRIGATION OR STOCK-WATERING DIVERSIONS, A WRITTEN APPEAL REQUEST MUST BE FILED WTTH THE DEPARTMENT THAT ISSUED OR DENIED THE APPROVAL OR LEVIED THE CIVIL PENALTY YOU ARE APPEALING (WAC 220 -110 -350). 2) FOR APPEALS OF DENIAL OR CONDITIONS OF AN HPA ASSOCIATED WITH IRRIGATION OR STOCK - WATERING DIVERSIONS *OTHER THAN CIVIL PENALTY APPEALS, A WRITTEN APPEAL REQUEST MUST BE FILED WITH THE HYDRAULIC APPEALS BOARD PER WAC 259 -04. THE MAILING. ADDRESS OF THE APPEALS BOARD IS: ENVIRONMENTAL HEARINGS OFFICE, BUILDING TWO -ROWE SIX, LACEY, WASHINGTON 98504; TELEPHONE 206/459 -6327. 3) FAILURE TO APPEAL WITHIN 30 DAYS OF THE DATE OF ACTION YOU ARE APPEALING RESULTS IN FORFEITURE OF ALL APPEAL RIGHTS. DEPARTMENT OF FISHERIES HYDRAULIC PROJECT APPROVAL ,,. R.C.W. 7 5 . 20 .10 0 DEPARTMENT OF FISHERIES R.C.W. 75.20.103 General Administration Bldg. � Olympia, Washington 98504 p 1 November 1, 1994 (206).753-6650 (applicant should refer to this date in all correspondence) PAGE:2.0F 2 PAGES 10 LAST NAME City of Tukwila EU ONTACT PHONES) (206) 433 -1843 El CONTROL NUMBER 01- A3101 -01 WATERGreen River 0 WRIA 09.0001. 9. Alteration or disturbance of bank, or bank and shoreline vegetation shall be held to an extreme minimum, and all disturbed areas shall be protected from erosion and revegetated. 10. Work shall conform to the plans submitted to Washington Department of Fish and Wildlife (WDFW) dated October 14, 1994, except as modified by this approval. 11. At least 48 hours prior to starting this, project,. contact Phil Schneider at (206) 775 -1311, extension 107. 12. Work shall occur between March 15 and November 15 of any year within the above time limitations. LOCATION: On the left bank up river of Fort Dent Park in Tukwila. it 'REV 10/16/88 THIS APPROVAL IS TO BE AVAILABLE ON THE JOB SITE AT ALL TIMES AND ITS PROVISIONS FOLLOWED BY THE ?ERMITTEE AND OPERATOR PERFORMING THE WORK THE PERSON(S) TO WHOM THIS APPROVAL IS ISSUED MAY BE HELD LIABLE FOR ANY LOSS OR DAMAGE TO FISHLIFE OR FISH HABITAT WHICH RESULTS FROM FAILURE TO COMPLY WITH THE PROVISIONS OF THIS APPROVAL. FAILURE TO COMPLY WITH THE PROVISIONS OF THIS APPROVAL COULD RESULT IN A. CIVIL PENALTY OF UP TO ONE HUNDRED DOLLARS PER DAY OR A GROSS MISDEMEANOR CHARGE, POSSIBLY PUNISHABLE BY FINE OR IMPRISONMENT. ALL HYDRAULIC PROJECT APPROVALS ISSUED PURSUANT TO RCW 75.20.100 ARE SUBJECT TO ADDITIONAL RESTRICTIONS, CONDITIONS, OR REVOCATION IF THE DEPARTMENT OF FISHERIES OR DEPARTMENT OF WILDLIFE DETERMINE THAT NEW BIOLOGICAL OR PHYSICAL INFORMATION INDICATES THE NEED FOR SUCH ACTION. THE PERMITTEE HAS THE RIGHT PURSUANT TO CHAPTER 34.04 RCW TO APPEAL SUCH DECISIONS.' ALL HYDRAULIC PROJECT APPROVALS ISSUED PURSUANT TO RCW 75.20.103 MAY BE MODIFIED BY THE DEPARTMENT OF FISHERIES OR DEPARTMENT OF WILDLIFE DUE TO CHANGED CONDITIONS AFTER CONSULTATION WITH THE PERMITTEE: PROVIDED HOWEVER, THAT SUCH MODIFICATIONS SHALL BE SUBJECT TO APPEAL TO THE HYDRAULIC APPEALS BOARD ESTABLISHED IN RCW 75.20.130. THIS APPROVAL PERTAINS ONLY TO THE PROVISIONS OF THE FISHERIES AND WILDLIFE CODES. ADDITIONAL AUTHORIZATION FROM OTHER PUBLIC AGENCIES MAY BE NECESSARY FOR THIS PROJECT. APPEALS - GENERAL INFORMATION IF YOU WISH TO APPEAL DENIAL OR CONDITIONS OP AN HPA, THERE ARE INFORMAL AND FORMAL APPEAL PROCESSES AVAILABLE. A.' INFORMAL APPEALS: - AN INFORMAL APPEAL (WAC 220.110 -340) CONSISTS OF CONTACTING THE REGIONAL HABITAT MANAGER AND DISCUSSING YOUR CONCERNS. MO:T PROBLEMS ARE RESOLVED AT THIS LEVEL, BUT IF NOT, YOU MAY EI.EVATE YOUR CONCERNS TO THE CHIEF OF THE HABITAT MANAGEMENT DIVISION IN OLYMPIA. THE HABITAT MANAGEMENT DIVISION CHIEF'S DECISION SHALL BE APPROVED OR DISAPPROVED BY THE DIRECTOR OR DESIGNEE. IF YOU ARE NOT SATISFIED WITH THE RESULTS OF THIS INFORMAL APPEAL, A FORMAL APPEAL MAY BE FILED. B. FORMAL APPEALS: 1) FOR AI.L'CIVIL PENALTY APPEALS AND FOR OTHER HPA APPEALS WHICH ARE NOT ASSOCIATED WITH IRRIGATION OR STOCK- WATERING DIVERSIONS, A WRITTEN APPEAL REQUEST MUST BE FILED WITH THE DEPARTMENT THAT ISSUED OR DENIED THE APPROVAL OR LEVIED THE CIVIL PENALTY YOU ARE APPEALING (WAC 220- 110 -350). 2) FOR APPEALS OF DENIAL OR CONDITIONS OF AN HPA ASSOCIATED WITH IRRIGATION OR STOCK- ' WATERING DIVERSIONS OTHER THAN CIVIL PENALTY APPEALS, A WRITTEN APPEAL REQUEST MUST BE FILED WITH THE HYDRAUUC APPEALS BOARD PER WAC 259.04. THE MAILING ADDRESS OF THE APPEALS BOARD IS: ENVIRONMENTAL HEARINGS OFFICE, BUILDING TWO -ROWE SIX, LACEY, WASHINGTON 98504; TELEPHONE 206/459-6327. 3) FAILURE TO APPEAL WITHIN 30 DAYS OF THE DATE OF ACTION YOU ARE APPEALING RESULTS IN FORFEITURE OF ALL APPEAL RIGHTS. ■ SHORELINE SUBSTA TIAL DEVELOPMENT APPLICATION CITY OF TUKWILA DEPARTMENT OF COMMUNITY DEVELOPMENT 6300 Southcenter Boulevard, Tukwila, WA 98188 Telephone: (206) 431 -3680 1. BRIEFLY DESCRIBE YOUR PROPOSAL: bank using riprap and vegetation. The intent is to stablize the eroding river 2. PROJECT LOCATION: (Give street address or, if vacant, indicate lot(s), block, and sub- division; or tax lot number, access street, and nearest intersection) Green River at East end of Southcenter Boulevard. Quarter: W 1/2 Section: 24 Township: 23 Range: 4 (This information may be found on your tax statement) 3. APPLICANT:* Name: City of Tukwila - Parks and Recreation Department Address: 6200 Southcenter Boulevard, Tukwila, WA 98188 Phone. (206) 433 -1843 Signature: C '%is ;t4 / ��c "- QMo W % /iams Date: 8 - l ' 9¢ * The applicant is the person whom the staff will contact regarding the application, and to whom all notices and reports shall be sent, unless otherwise stipulated by applicant. AFFIDAVIT OF OWNERSHIP 4. PROPERTY Name: City of Tukwila OWNER Address: 6200 Southcenter Boulevard, Tukwila, WA 98188 Phone: (206) 433 -1843 I /WE,[signature(s)1 ! /A.49--) swear that I /we are the owner(s) or contract purchaser(s) of the property involved in this application and that the foregoing statements . and answers contained in this REomperyire true and correct to the best of my /our knowledge and belief. Date: $'3(q¢ ALS 31994 COMMUNITY DEVELOPMENT SHORELINE SUBSTANTIAL i. VELOPMENT APPLICATION Page 2 5. Present use of property: River Bank 6. Total construction cost and fair market value of proposed project (include additional future developments contemplated but not included in this application): n/a 7. List the master program policies (use program sections or page numbers) which are applicable to this development: n/a 8. List any other permits for this project from state, federal or local governmental agencies for which you have applied or will apply, including the name of the issuing agency, whether the permit has been applied for (and if so, the date of the application), whether the application was approved or denied and the date of same, and the number of the application or permit: Hydraulic Project Approval - WDF - Applied for August 1, 1994 SEPA Checklist - City of Tukwila - Submitted August 1, 1994 City Utility Permit _ City of Tukwila — Submitted August 1, 1994 Flood Control Zone - City of Tukwila - Utility Permit Submitted August 1, 1994 9. Nature of the existing shoreline. Describe type of shoreline, such as stream, lake, marsh, flood plain, floodway, delta; type of beach, such as erosion, high bank, low bank, or dike; material such as sand, gravel, mud, clay, rock, riprap; and extent and type of bulkheading, if any (to be completed by local official): ?2o)e-Tc 1 NvE ..GPM(— (1..k2(2tNITtl r azy» N 6 D 10. In the event that any of the proposed builidngs or structures will exceed a height of thirty -five feet above the average grade level, indicate the approximate location of and number of residential units existing and potential, that will have an obstructed view (to be completed by local official): §HORELINE SUBSTANTIAL ` VELOPMENT APPLICATION C Page 3 11. If the application involves a Conditional Use or Variance, set forth in full that portion of the Master Program which provides that the proposed use may be a Conditional Use or, in the case of a Variance, from which the variance is being sought (to be completed by local official): NJ 12. Give a brief narrative description of the general nature of the improvements and land use within one thousand (1,000) feet in all directions from the development site: The nature of the improvement is to stabilize the eroding river bank using riprap and vegetation. Land use to the west is commerical, north is park land, the eastis railroad right -of -way and south is the Green River and some commerical land adjacent to the river bank. L94 -0060 CITY OF TUKWILA SHORLINE n y.l ` ..} 1 w,`,s$u �•, v ua :° ': ,; ,,vs,z� c° � ,5 � �k' u'� '2 j > at ";:i : -. •.i .,tY ,it �- .a ans ,° ' , >. n'•a ,iE C 111111111111111 I I I I I I I I T111111111111111111.11111111111111111111M11 ,U .� "srv,,r�, . , �1:,'�, °I.:'.G y . " +,�,�cT �•', S ; fir, N� : MAYOR JOHN W. RANTS DIRECTOR OF PUBLIC WORKS ROSS A. EARNST, P.E. CITY ENGINEER RON CAMERON, PE CITY COUNCIL STEVE MULLET, PRESIDENT DENNIS ROBERTSON JOAN HERNANDEZ JOYCE CRAFT ALLAN EKBERG JOE DUFFIE DOROTHY DERODAS PROJECT SITE ---.\ LIST OF DRAWINGS SHEET NO TITLE 1 TITLE SHEET 2 PLAN SHEET 3 DETAILS 4 SECTIONS VICINITY MAP • WISES 6/1/. . . RECEIVED. OCT 14,1994 COMMUNI f'Y !DEVELOPMENT P° WE/LIC' WORKS K.P T. *ENGINEERING* STREETS * WATER * SEWER * BUILDING by date designed CER 10/94 drawn AEE 10/94 Checked RJL 10/94 proj eng RJL 10/94 Adir field bk no C4K9UItYQ & IReeve RIVERBANK STABILIZATION 201 Third Avenue Suite 800 Seattle Washington Sept 12060 622-5822 Fax WOW 622.6190 TITLE SHEET no date regions file no scale AS SHOWN date ,3.30T,l . "+[t +rz'•rusa�;:e • vw.: 5 ter:- ,- }` , - 5. 4 .. '.:i S ip .,I '.r .. .:. x.c_.;,,a�,��:.I -• 't �? .,.,�. 'i.wr �, -.F..+ u 'c FI. as ...',..e,ti -"+ t;; y' ��r: l..:. :ei';.':.,;;!i"i3'.i'3Fs•'7r.,. �i. }$t,!'. S,rn: ;,l: �.�i�ut���.b�,.',•�E��G`�S s'i��i:�: ^'$r�',-:vc: i,.i '.ir�:.L;::'i �. 1-111111 11 11IIII1I111II1111' 1' IIIIIII IIIIII11' I' 11 1111I111I1 1IIIIIIIIII111111IIIIIIIIIIIIII111I' I' IIIII' 111111III111III111111 'IIII1I111111111' 11111111111 1 111 1111111111I 11111i1i1i1111111 0 IETNSINCH 1 2 4 5 6 7 8 9 10 11 MApITIOIpH.NI 17 0 FLEXIBLE RULER-302AWoeu..,,.— _. IIF THIS MICROFILMED DOCUMENT IS LESS CLEAR THAN THIS NOTICE, IT IS DUE TO 1 THE QUALITY OF THE ORIGINAL DOCUMENT LZ 9.1. SZ vL EZ 6L lZ Oz 61. el LA 9l St VI. El et LL , .Ol 6 1!J,l, 414aIIl�� iII 14,11 ��� I���II�� I �au�! ! ll;l>:OJI!i,;l. ,ill,! 1,0,11l_�111�,�1I �IOrtiu,� 11►�� i ��I�il�u! 1P,031.1 M,L,IU,1lI i� .0 W11041440404944044„ ., , w1�JJ !! 14 1!�� �. CLUMP OF MAPLE TREES 36'0 AT BASE SPLITS INTO 5-8'0 TREES VERTICAL DATUM NOS D408 BM DISK FOUND :3 FEET ABOVE GROUND AND SET VERTICALLY IN THE SOUTH FACE OF A CONCRETE SUPPORT PIER'MUER THE INTERSTATE 405 OVERPASS ON SR -181. SAID PIER BEING THE, THIRD PIER NORTH OF THE MOST SOUTHERLY PIER BETWEEN THE NORTH BOUND AND SOUTH BOUND LANES OF SR -181. ELEVATION: 29.734 N.G.V.D. 29 N•116'17'03" W 5 N \ �� SMCiA HOC.. Bt , E' �gEE r4 N7 410------ CLUMP OF MAPLE TREES 50'0 AT BASE SPLITS INTO 4 -12'0 TO 18'0 TREES CLUMP OF MAPLE TREES 60'0 AT BASE SPLITS INTO 6-12 "0 TREES CLUMP OF MAPLE TREES 40 "e AT BASE SPLITS INTO 5 -12'e TO 15'e TREES 5 M01 E EEC\ „— x25.7 is r- 5'e AND 8'e i MAPLE TREES co L CLUMP OF 6'0 MAPLE TREES 0X 23.6 25.0 - 12'0 MAPLE TREE LEGAL DESCRIPTION THE NORTHWESTERLY AND NORTHEASTERLY 20 FEET OF PARCEL 2 OF CITY OF TUKWILA SHORT PLAT No. 79 -7 -SS, AS RECORDED UNDER KING COUNTY RECORDING No. 7908210370. MERIDIAN PER: CITY OF TUKWILA S.P. No. 79 -7 -SS REC. No. 7908210370 NOTES 1. APPROXIMATE LOCATION OF THE 100 YEAR FLOOD HAZARD AREA BASE ELEVATION PER FEDERAL EMERGENCY MANAGE- MENT AGENCY "FLOOD INSURANCE RATE MAP” PANEL 326 OF 650 MAP No. 53033C0328 0, EFFECTIVE DAZE: SEPTEMBER 29, 1969. ,2. UPLAND AREAS DETERMINED 10 BE OUTSIDE 500 -YEAR FLOOD PLAIN PER FEDERAL EMERGENCY MANAGEMENT AGENCY "FLOOD INSURANCE RATE MAP" PANEL 328 OF 650 MAP No. 53033C0328 0, EFFECTIVE DATE: SEPTEMBER 29, 1989. N 25 25.12 X25. e 2' • MAPLE TREE - • 26.10 x 22.6 APPROX. LOC. 100 YR. FLOOD HAZARD AREA BASE ELEVATION (SEE NOTE I) • 15'0 COTTONAOO TREE 0 5 10 20 40 SCALE 1”= 20“ 60 LEGEND x 22.15 EX. SPOT ELEVATION (TYPICAL) • FND REBAR W/ CAP O SET REBAR ON TRAIL CENTERLINE EXISTINGCONTOURS PROPOSEgICONTOURS Jfi LIGHT POLE F 0 BRUSH. & ',MAIL TREE LINE " ROCK TOE KEY (62 )- RIPRAP BANK (_ x22.1 •0 CLUMP 01 COTTOtFA00D TREES Cf 48'R AT RASE SPLITS 1010 f� \\ ,7 -12'a TREES \ 2,\ \ems. GREEN RIVER 2 \I \\ .r \ \ 20. FOOT DEd CATION TO REC CITY OF�t1�dWILA \ REcy — \ 1 CONSTRUCTION NOTES 01 CONSTRUCTION ACCESS VIA TEMPORARY EASEMENT THROUGH PROPERTY AT 6840 SOUTHCENTER BLVD., SEE DETAIL, THIS SHEET. 02 INSTALL TEMPORARY RAMP FROM PARKING LOT TO ACCESS ROAD. EXISTING CURB SHALL NOT BE DISTURBED DURING CONSTRUCTION. DAMAGE TO CURB SHALL BE REPAIRED AT CONTRACTOR'S EXPENSE. 03 INSTALL HEAVY LOOSE RIPRAP TOE AND KEY INTO STABLE BANK, SEE DETAIL 4, SHEET 3. ® INSTALL LIGHT LOOSE RIPRAP, SEE DETAIL 4, SHEET 3. GRADING LIMITS TRAIL EASEMENT F.X. CULVERT' 12 CMF' WEST END, 4 ..F. =19.48 ■) INSTALL QUARRY SPALL FILTER PAD AND VEGETATIVE GEOGRID FROM TOP OF RIPRAP TO TOP OF BANK, SEE DETAIL 4, SHEET 3. © STA. 11 +70, 62' RT. INSTALL LARGE WOODY DEBRIS, SEE DETAIL 5, SHEET 3. 07 ALL VEGETATED AREAS DISTURBED DURING CONSTRUCTION SHALL BE SEEDED, INCLUDING CONSTRUCTION ACCESS ROUTE. x 23.4 240' 3.1 23 CONSTRUCTION ACCESS ROUTE PROJECT SITE i z'r ,-,C \ ��pA� x26.6 /O AF/ iii / ?, -,- \ NOTES 1. ACCESS ROAD EASEMENT SHALL BE STAKED BY THE CONTRACTOR AND APPROVED BY THE ENGINEER PRIOR TO USE. EX. BUILIAN 53 CONSTRUCTION ACCESS DETAIL NTS oJ)'\ 75.99 RECEIVED OCT 141994 I DEVELOPMENT F UR.idI C WORKS DEPT. * ENGINEERING * STREETS *WATER * SEWER * BUILDING * by date designed CER 10/94 drawn AEE 10/94 cbeoked RJL 10/94 proj.eng RJL 10/94 prof dir field bk no JC oneultl'p evirare RIVERBANK STABILIZATION 2 7271 7T11'Id Avarua &dte 900 8esettle. Weetinatcn 98171 C?019 822-6822 Fax (2081822-8B0 PLAN SHEET no date revisions 4 J file no scale AS SHOWN date . !11P��j � tprn +� �ni-�. {�Zr y 1 a pr �w. . r -t... �•,rF s? . R � i 1 ��{ -r•It i � 1 �<y"i r �:� . � n `'k". i. . ,"1".w z r{ 7 4 .,i✓� d ii 6':Sr ,7, Y' i .'v .;1 1, . r�a� JiR J,ry. �+i 5,'r .Tti. _ 1 : t , ru ' - r,.i . �' L `,AFL:.., i.. +' �u _.•`*' ,t zr,�,�1 Fft7 {r.- ..-4'x "`, Ski„ s ' .,R, i • "•tu.w .t. '': r. .,. . -'` ?�.b.4w, ""P"Ma i, Si.`,'.. t:,irc:,aC:�:ui ._.r..,. »..r 1Yti��x. �; 7v' r :rz.;f•�;SM.fti?:i4'il':atir{r.a �Fnfl .A;..h?'e. 4Jn[��.:.'�1 IIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIII' IIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIII IIIIIII1IIIIIIIIIIIII111111IIIIIIIIII111111I IIII IIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII1 IIIIIIIIIIIIIIII 111111111 0 15TH51NCH 1 7 ti:` ...T. ' ITr R7'MiT.70TiRCxtt+`J I:tslnx. ••Karces mo-z n,vr-- „^".Ltot ?me. Derr^ ri^. tpr oe...,..,,mn,..r.,> +=w+•i•n,+.m.••a�: ..::ra.••2asae+e,.,..:. 1 •1 2 4 5 6 7 8 9 10 11 M4 (INGfPM.NY 1� FLEXIBLE RULER -302 AWa....,.„._ 9L SZ VG CZ LL LZ OZ 61. 9IL LL 9L GI • L - EIl ZL LL 0L 6 N nn111111iNdnnllNdNn1lulhNl 11i -1111 l),WIU! 111IIR0,11!1111/11,114111.11. ,llll11 l�llU�1 )!!!III�IIII,III�.!l�.IIIIIt 1100.1 II f., s Itkr,� 1 ..:i :- t Sri l 'J`t ""i"`Nr j. f B c. 9 S V 1U11 C Z rL ww O �tINI ,III)4.021j161. 111 , 1111,11,` 114111111l1a1111I1111 ,Y .. mares t�.r:nlasxn,raa.�tt_a� IF THIS MICROFILMED DOCUMENT IS LESS ;I CLEAR THAN THIS NOTICE, IT IS DUE TO ;THE QUALITY OF THE ORIGINAL DOCUMENT BACKFILL MATERIAL LIVE BRANCH CUTTINGS 3'-4' 10' -15' SAME DEPTH AS ROOT BALL —' NOTES: 1. BRANCHES OF DIFFERENT SPECIES, AGES AND THICKNESS SHALL BE PLACED IN A RANDOM CRISS – CROSSED PATTERN. 2. THE BUTT ENDS SHOULD ANGLE DOWN ALONG THE 10' -15' BENCH, AND THE TIPS SHOULD PROTRUDE BEYOND THE FACE OF THE SLOPE. 3. IF CONSTRUCTED DURING THE DRY SEASON, THOROUGHLY WET EACH LAYER OF BRANCHES AND BACKFILL MATERIAL. 'ORDINARY HIGH WATER MARK ELEV. 7.5 TYPICAL PLANTING DETAIL VEGETATED GEOGRID AREA LIVE CUTTINGS SEE DETAIL 1, THIS SHEET 8' QUARRY SPALL FILTER BLANKET PLACE RIPRAP TO ELEV. 10.0 LANDSCAPE RESTORATION PLANTING LIMITS LANDSCAPE RESTORATION PLANTINGS - SEE DETAIL 2, THIS SHEET COIR GEOTEXTILE FABRIC WIDTH OF PLANTING PIT EQUALS 2x WIDTH OF ROOTBALL, MINIMUM TREE, SHRUB OR GROUNDCOVER ROOTFLARE SHALL BE LOCATED ABOVE GROUND LINE, SLOPE AWAY FROM TRUNK BARK MULCH, 2 INCHES MINIMUM NATIVE SOIL EXISTING SUBGRADE NOTES: 1. ALL PLANTING SHALL BE PLACED IN A RANDOM PATTERN WITH PLANTS IN GROUPINGS OF 1, 2, OR 3 PLANTS. THE PLANT SPACING WITHIN THE GROUPINGS SHALL BE IN ACCORDANCE WITH THE PLANT LIST, DETAIL 3, THIS SHEET. 2. PLANTS MAY BE FIELD COLLECTED OR NURSERY GROWN. LANDSCAPE RESTORATION PLANTING DETAIL TRAIL EASEMENT 10' 10'- TOP OF SLOPE LIMITS OF GRADING BACKFILL MATERIAL HEAVY LOOSE RIPRAP ROCK TOE KEY 1 "X 2" WOOD STAKES 12' MIN. LENGTH PLACE 6' 0.C., FULL LENGTH 8" QUARRY SPALL FILTER BLANKET GREEN RIVER CHANNEL BED 5' 5' NOTE LIGHT'LOOSE RIPRAP SHALL MEET THE FOLLOWING REQUIREMENTS FOR GRADING MINIMUM SIZE – 40% TO 90% 70% TO 90% 10% TO 30% PLACE 2 LAYERS OF LIGHT LOOSE RIPRAP MIN. THICKNESS 4' GRADE EXISTING SLOPE BACK AT 2:1 BANK STABILIZATION DETAIL 1 TON (1/2 CU. YD.) 300 LBS (2 CU FT) 3 INCH PLACE FIVE 3' -5' MIN. DIA. ANCHORING ROCKS ALONG EXPOSED LENGTH OF TREE TRUNK 0 COMMON NAME SCIENTIFIC NAME BLACKBERRY WILLOW RED ELDERBERRY 20' MIN. RUBUS SPECTABILIS SALIX SPECTABILIS AMELANCH1ER AQUIFOLIUM SIZE CUTTINGS CUTTINGS 1 gal. PLANT LIST FOR LANDSCAPE RESTORATION GREEN RIVER CHANNEL BED 2' LAYER OF HEAVY LOOSE RIPRAP 1 1/2' LAYER OF ROUNDED GRAVEL 2' DIAMETER, 20' -30' LONG TREE TRUNK WITH ROOTS. IMBED TREE TRUNK 12' -16' INTO RIVERBED BELOW OIiWM. TREE TRUNK SHALL PROTRUDE AT AN ANGLE OF 2' TO 10' DOWNWARD TOWARDS THE STREAMBED AND AT A 30' TO 40' ANGLE TO THE BANK. LARGE WOODY DEBRIS DETAIL SPACING 2' o.c. 5' o.c. 3' o.c. RECEIVED OCT 1 41994 I CUIvlt iu I I Y DEVELOPMENT (tt% P UB'LI C W 0 RK,S D EP T . ®! z * ENGINEERING* STREETS *WATER *SEWER *BUILDING * ' - y , by date k , t t �,�;,�� Hnirleere tiny nrb� errs soo snra Weerrrteear RIVERBANK STABILIZATION file designed CER 10/94 checked RJL 10/94 DETAILS no ro• en / RJL 10 94 / :roid ir scale . AS SHOW date. field ' bk no no date revisions 1 11I1ll111111111111111111111111111ilili1i1l1llil1lllll1l1lllll► I1IIIII1I1I1III1I1IIIII1I1IIIII1I1IIIII1I1W111I1IIIII1I1IIIII1I1II1II1I1I11111111IIIIII1IIIII1l1111111111111111111111111111111 '1 0 1STHSINCH 1 2 4 5 6 7 8 9 10 11 MUIf1■14111M.NY 17 OE 6z de Lz y sz vl ez 111111141466416 .., . ,, . ;^•^ ,. e? FLEXIBLE RULER -302 LL Oz EH a 9L St 44I e� zl �a 01. 6 1 Ie s v eI z I� •.w 0 al.u,;,;1�!u).�I 4II I,II���IUIlAI IUti�llltll itll. I! 11��111lltlllll���.liltll!1lI�J �II !>,611ai��1U,I�IJ}�4J1luJ.R,l1l I,l �i11�11U,l U. Il 1. I. Ua�l llll, tu!, uil .�llllfll�lll��ililiiJiluglnlil, ..1 j IF THIS MICROFILMED DOCUMENT IS LESS THAN THIS NOTICE, IT IS DUE TO .THE QUALITY OF THE ORIGINAL DOCUMENT • VERTICAL DATUM -A0 tC) N 0+00 DATUM a SV 0+10 0+20 0+30 0+40 0+50 0+60 CROSS— SECTION B STA. 11 +67 0+70 0+80 0+90 0+100 1— o` wiz z 7-11=). W 5 N -1 - - I N I SHED E = 23.5 EL = 83.5 . .. FINISHED EL = 23.5 o W O E D z C...) c v 5 SLOPE ROUNDING .� �� . PROPOSED BANK EXIS`ING GROUND EXISTING G GROUND 0 s ., �, 5 BANK .. `, \. . "-- 5' SLv E �� ROUNDING - ? - EXISTING G UND . . D `, .' D EX RI ■ STING TOE OF .`. ER BANK ■ .\ EXITING TOE 0= \ \. 3 CTR. LINE o O N , `. N 0 f\ M M M ■ EXISTING TOE OF`. RIVER BA K , - LJ zo -J H U p C N N N. d N 0+00 DATUM a SV 0+10 0+20 0+30 0+40 0+50 0+60 CROSS— SECTION B STA. 11 +67 0+70 0+80 0+90 0+100 1— o` wiz z 7-11=). W 5 N . L- . F - I N I SHED E = 23.5 EL = 83.5 . .. . z W U o W O E 5 SLOPE ROUNDING .� �� . 45 EXIS`ING GROUND EXISTING G GROUND 0 s 1 PROPOSED \ BANK 5 . . `, .' D EX RI ■ STING TOE OF .`. ER BANK EXITING TOE 0= \ \. CTR. LINE o O N , N 0+00 0+10 0+20 0+30 0+40 0+50 0+60 0+70 0+80 0+90 AUTA SZ —40 P.5--- t N . L- . F FINISHED E EL = 83.5 . .. E 5' SLOPE':' � �` ` E "\ EXISTING G GROUND s `, .' D DROPOSED BgNK EXITING TOE 0= \ \. 20' DED. 21.9 f\ M M M CROSS— SECTION C STA. 11 +89 NGS,D408 BM DISK FOUND"3 FEET ABOVE GROUND AND SET VERTICALLY IN THE SOUTH FACE OF A CONCRETE SUPPORT PIER UNDER THE INTERSTATE 405 OVERPASS ON SR -181. SAID PIER BEING THE THIRD PIER:NORTH OF. THE MOST SOUTHERLY PIER BETWEEN THE NORTH BOUND AND SOUTH BOUND LANES OF SR -181. ELEVATION: 29.734 N.G.V.D. 29 100 GENERAL NOTES 1. ALL CONSTRUCTION SHALL BE IN ACCORDANCE WITH THE STANDARD SPECIFICATIONS, SPECIAL PROVISIONS, KING COUNTY SWM 'GUIDELINES FOR BANK STABILIZATION PROJECTS', CONTRACT PLANS AND CITY OF TUKWILA CODES, ORDINANCES AND POLICIES. 2. THE CONTRACTORS TEMPORARY EROSION CONTROL SYSTEM - SHALL BE APPROVED BY THE CITY AND INSTALLED PRIOR TO BEGINNING CONSTRUCTION. SUCH MEASURES SHALL REMAIN IN EFFECT UNTIL CONSTRUCTION IS COMPLETED AND THE POTENTIAL FOR EROSION HAS PASSED. 3. UNDER NO CIRCUMSTANCES ARE ANY TREES OR VEGETATION TO BE REMOVED OR DISTURBED WITHOUT APPROVAL OF THE CITY. ALL AREAS DISTURBED DURING CONSTRUCTION SHALL BE REVEGETATED IN ACCORDANCE WITH THE SPECIFICATIONS AND AS DIRECTED BY THE ENGINEER. 4. WHERE POSSIBLE TREE ROOTS 2' IN DIAMETER AND LARGER SHALL BE TUNNELED UNDER. WHERE CUTTING OF SUCH ROOTS IS UNAVOIDABLE THE ROOTS SHALL BE SAW CUT AND THE EXPOSED ENDS COATED WITH AN APPROVED SEALANT. 0 +100 RECEIVED OCT 141994 CROSS— SECTION A STA. 11 +50 CULv i .n' 1 Y DEVELOPMENT CHRIS ep/ P U.BLI C WORKS. 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