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HomeMy WebLinkAboutPermit L04-066 - HANSEN JON - TREE CLEARING SPECIAL PERMISSIONJON HANSEN KC Water & Land Resources Division remediation habitat restoration project 2724 S 112 ST L04 -066 FILE NUMBER: City of Tukwila Department of Community Development Steve Lancaster, Director Notice of Decision DATE: October 25, 2004 L04 - 051, Tree Clearing Permit L04 -066, Special Permission from the Director asking for a waiver of certain requirements of obtaining a Tree Permit. LOCATION: 11025 Tukwila International Blvd King County Parcel(s) 04230499114, 04230499118 APPLICANT: King County Department of Natural Resources and Parks PROPERY OWNER King County ZONING DESIGINATION: MIC/H SHORELINE CLASSIFICATION: Urban NOTIFICATION: Pursuant to TMC 18.54.150 both Land Use Applications are Type I Decisions and there are no notification requirements. SEPA DETERMINATION: DNS issued by King County Department of Natural Resources and Parks, dated May 24, 2004 OTHER REQUIRED CITY PERMITS: Type C Permit, City of Tukwila Department of Public Work's Department PERMITS REQUIRED FROM OTHER AGENCIES: National Environmental Policy Act Endangered Species Act (Section 7) Concurrence, USFWS and NMFS Clean Water Act Section 404 Authorization, US Army Corps of Engineers Clean Water Act Section 401 Permit, Washington State Department of Ecology Coastal Zone Management Act Consistency, Washington State Department of Natural Resources Aquatic Resources Easement, Washington State Department of Natural Resources Steven M. Mullet, Mayor l 6300 Southcenter Boulevard, Suite #100 • Tukwila, Washington 98188 • Phone: 206- 431 -3670 • Fax: 206 - 431 -3665 Hydraulic Project Approval, Washington State Department of Fish and Wildlife BACKGROUND: STAFF: Alice Strand, Senior Planner Brandon J. Miles, Assistant Planner King County Department of Natural Resources (KCDNR) has applied for a Tree Clearing Permit and Special Permission from the Director for expectations to the requirements for issuance of a tree- clearing permit. The project area, commonly known as North Wind Weir is located at 11025 Tukwila International Blvd (TIB). While the property is address off of TIB it is actually one block off of TIB and direct access to the site is from S. 112 Street. This project is a component of the Green/Duwamish Ecosystem Restoration Project and will restore salmon habitat along the lower Duwamish River. EXISTING DEVELOPMENT The 3.27 acre site is currently undeveloped and has not been used for commercial or residential activities in some time. There are two concrete foundations on the site that are the remnants of two homes that use to occupy the site. The site is generally flat with the steepest slope on the site being three percent. Soils on the site consists of old industrial fill. The edge of the property along the River has been significantly altered and a large amount of rip rap has been used to separate the property from the Duwamish River. SURRONDING LAND USES The site is bordered by commercial and industrial uses. PROJECT INFORMATION The purpose of the North Wind Weir Intertidal Restoration Project is to restore intertidal habitat within the lower Duwamish River, with the intent of specifically providing mudflat and saltmarsh habitats suitable for rearing and foraging by juvenile salmonids. This will be accomplished by removing fill material and regrading the site to intertidal elevations, reconnecting the site to the river, restoring the natural shoreline, and planting native intertidal and riparian vegetation. The project will involve the excavation and removal of approximately 65,000 cubic yards of fill and native soil material from the site. Much of the fill on the site is contaminated by hydrocarbons, likely from old underground storage tanks that were on the property. The majority of the site will be lowered to elevations ranging from -1 to +4 feet NGVD 88 and will be connected to the Duwamish River via an entrance off the east side of the rock weir and its associated scour pool. The applicant has submitted for Phase One of the project which involves the removal of much of the vegetation on the site and grading of the site which will include the removal of a significant amount of soil material. 2 The proposed work will involve the removal of a large number of significant trees within the shoreline environment (200 feet from the ordinary high water mark). TMC 18.06.775 defines a significant tree as a tree which is four inches or more in diameter as measured 4.5 feet above grade. SHORELINE REGULATIONS Phase I of this project is exempt from the requirement of having to obtain Shoreline Substantial Development Permit pursuant to WAC 173 -27 -040 (2)(P). TREE CLEARING PERMIT TMC 18.54 050 requires that a Tree Clearing Permit be obtained for the removal of any significant trees within the shoreline zone. TMC 18.54.080 lists the required information in order for the City to issue a Tree Clearing Permit. Additionally, under TMC 18.54.120 the applicant is required to submit a security instrument in the amount of the replacement cost of the removed vegetation. KCDNR has requested that the following code requirements and submittal requirements be waived in order to obtain a Tree Clearing Permit for the proposed project: 1. Reducing the number of trees required to mitigate the loss of significant trees and cottonwoods within 100 feet of the shorelines; 2. Reducing the size of the replacement trees to be planted; 3. Waiving the requirement for the posting of a bond/security; 4. Waiving certain plan requirements that relate to the landscaping plan; and 5. Allowing for the revegetation to be completed later in time (following phase 2), after the additional site grading has been completed. The Director of Community Development (Director) has the authority under TMC 18.54.090 to waive certain submittal requirements, which includes items three and four above. Additionally, under TMC 18.54.140 the Director may grant certain exceptions from the requirements of TMC 18.54.140. DISCUSSION Given the nature of the project, the waiver request is not unreasonable. The project when complete would restore much needed transitional habitat for juvenile salmonoids. In this low tide environment, juvenile salmonids would have the opportunity to feed, rest, and undergo smoltification prior to out - migrating through the Puget Sound to the Pacific Ocean. Additionally, the habitat would provide refuge, foraging, and possibility breeding habitat for a variety of other urban - adapted native fish and wildlife species. Request to reduce the number of trees required to mitigate the loss of significant trees and cottonwoods within 100 feet of the shorelines. The existing shoreline environment on the project is not natural, but is the result of over one century of human impact, including construction activities, fill and extensive modification of the shoreline along the property. This project will remedy many of these human activities that have occurred on the property. 3 When the project is complete, a majority of the property will be regularly inundated by tidal waters and will not be able to support tree species. A portion of the tidal area will be restored to an intertidal marsh with plant species that are typical of such an environment. Tree plantings are also limited by the presence of a Seattle City Light power lines to the north and an existing industrial building and concrete retaining wall to the south. The conceptual tree planting plan submitted by the applicant will utilize those areas capable of supporting large tree species. However, the number of trees added to the property would be less than what would be required per TMC 18.54.130 (2) (b). Reducing the size of the replacement trees to be planted TMC 18.54.130 (3)(c)(1) requires that replacement trees be 2.5 inch in caliper for deciduous trees and that evergreen trees be at least six to eight feet at time of planting. The applicant has noted that large trees perform poorly on this type of restoration project and would request to use smaller size trees. The applicant has noted that larger trees tend to take longer to establish on the site which leads to a high mortality rate. While smaller trees have a higher success rate. The applicant has more experience in these types of restoration project than the City and the City should defer to their judgment. Waiving the requirement for the posting of a bond/security The applicant has asked that due to the fact that they are a public agency that the City waive the requirement to the post a security bond. They have noted that typically they have not been required to bond for these types of restoration project. The applicant has noted that Phase I of the project is fully funded and that Phase II of the restoration project is in the 2005 budget that has been presented to the King County Council. The project is also dependent on Federal funds and King County will if necessary provide the necessary funding should the Federal funding become unavailable. This is the first example of an outside agency requesting the issuance of a tree - clearing permit. Waiver of bond requirements are often made for City projects, such as when Public Works submits for land use permits. Thus, there is precedent for waiving the bonding requirement. Additionally, given the large financial commitment that King County has already made on this project, it is highly unlikely that they would not complete the project. King County, like the City of Tukwila also has responsibility to follow the laws of all jurisdictions that they are working within. Waiving certain plan requirements that relate to the landscaping plan As this is a multi -phase project it is premature at this time for the applicant to submit a landscaping plan as required in TMC 18.54. The applicant has submitted a conceptual landscaping plan to the City and a final landscaping plan will be submitted prior to the start of work on Phase II of the restoration project. Allowing for the revegetation to be completed later in time (following phase 2), after the additional site grading has been completed 4 Phase I of the project will only consists of removal of the contaminated soil on the site. Phase II of the project will include extensive site excavation, final grading, revegetation, and connection of the newly created marsh habitat to the river. Phase I of the project will be completed during the fall /winter of 2004. Phase II of the project must occur during a "fish" window which is a low tide cycle. The proposed tree clearing work will includes the work for Phase I. The applicant will submit the landscaping plan as part of Phase II for City review. DECISION CRITERIA An expectation to TMC 18.54 shall not be granted unless all of the following criteria are met: • Strict compliance with the provisions of this code may jeopardize project feasibility or reasonable use of the property. • Proposed vegetation removal, replacement, and any mitigation measures proposed, are consistent with the purpose and intent given in this chapter • The granting of the expectation or standard reduction will not be detrimental to the public welfare or injurious to other property in the vicinity. Strict compliance with the provisions of this code may jeopardize project feasibility or reasonable use of the property Strict adherence to the City's Tree Regulations on this project would make this habitat restoration project unfeasible. The goal of this project is to restore much - needed habitat for juvenile salmonoids within the lower Duwamish River. This will be done by remedying many of the man made impacts that have occurred on the property and restoring the property to a natural state. A natural state does not necessarily include trees, but can include other vegetation species, which the applicant has proposed to installed. Given other restraints on the property such as the presence of overhead power lines and nearby industrial buildings it would be impossible to add the number of replacement trees as required in TMC 18.54. Proposed vegetation removal, replacement, and any mitigation measures proposed, are consistent with the purpose and intent given in this chapter TMC 18.54.020 provides the intent of the City's Tree Regulation chapter. This chapter includes a variety of goals all of which are aimed to mitigate building and site development. This project will revert a site that was an industrial development to a natural state which will be used for salmon habitat. This project will improve the quality of Tukwila's Urban Environment (TMC 18.54.020 (2). The project will remove a significant amount of contaminated soil and restore the natural state of the shoreline area. Additionally the project will enhance the aesthetic and ecological environment of the City of Tukwila by providing wildlife habitat, removing contaminated soils which are likely leaching into the Duwamish River, and enhancing the visual and aesthetic qualities of the City's urban environment. The granting of the expectation or standard reduction will not be detrimental to the public welfare or injurious to other property in the vicinity 5 In this case, granting the expectation will actually be beneficial to the public welfare and adjacent properties. The applicant will be removing a significant amount of contaminated soil and restoring the natural shoreline of the property. One of the policies of the King County Shoreline Master program, which the City of Tukwila administers is to where appropriate restore natural flora and fauna. Additionally, Policy 2 under the Conservation Element of the King County Shoreline Master Program notes that the natural topography of the site should not be substantially altered. With this project, the applicants will be restoring the site to a natural state. Policy 4 under the Conservation Element of the King County Shoreline Master Program encourages that the wildlife and aquatic habitats be protected, improved, and if appropriate increased. This project will increase the amount of habitat for juvenile salmoniods within the lower Duwamish River. CONCLUSION The North Wind Weir Habitat Restoration Project will provide essential salmon habitat within the lower Duwamish River. While the project will not comply with the code requirements listed under TMC 18.54, it does meet many of the goals of the chapter. The City's Tree Regulation Chapter is concerned with the environmental consequences of land development, the North Wind Weir Habitat Restoration Project will restore an area of land along the Duwamish River that has been impacted by previous industrial development. The overall environmental benefits of the project off set the minimal environmental impacts that will result from the project. DIRECTOR'S APPROVAL The removal of significant trees along the Duwamish River on the following King County Parcel(s) 04230499114, 04230499118 is approved. Additionally, the Director has allowed that the following expectations be made, pursuant to TMC 18.54.140: 1. The applicant may reduce the number of trees required to mitigate the loss of significant trees and cottonwoods within 100 feet of the shorelines. 2. Due to the applicant's expertise in the habitat restoration projects the applicant may reduce the size of the replacement trees to be planted. 3. The letter submitted by Don Althauser on October 21, 2004 shall substitute for the posting of a security bond in relation to the Tree Clearing Permit. 4. The landscaping plan does not have to be submitted during Phase I of the project. The applicant will be required to submit a landscaping plan prior to start of Phase II of the project. 5. To reduce the impact of the project on wildlife within the Duwamish River, revegetation may be completed following Phase II of the project, but revegetation of the site must be completed by August 31, 2006. Steve Lancaster, Director Community Development APPEAL INFORMATION 10 ZS- OV Date: 6 TMC 18.140.010 allows for the Tree Clearing Permit and the Special Permission of the Director to be appealed to the Hearing Examiner. A Notice of Appeal must be submitted to the City of Tukwila within 14 -days from issuance of this Notice of Decision. The Notice of Appeal must include the following: 1. The Name of the appealing party. 2. The address and the phone number of the appealing party; and if the appealing party is a corporation, association or other group, the address and phone number of a contact person authorized to receive notices on the appealing party's behalf. 3. A statement identifying the decision being appealed and the alleged errors in that decision. The Notice of Appeal shall state specific errors in fact or errors in application of the law in the decision being appealed; the harm suffered or anticipated by the appellant, and the relief sought. The scope of the appeal shall be limited to matter or issues raised in the Notice of Appeal. 4. The Notice of Appeal shall be distributed by the Department to the body designated to hear the appeal and to parties of record pursuant to TMC 18.112.020A. 7 October 21, 2004 Dear Ms. Strand: King County Water and Land Resources Division Department of Natural Resources and Parks King Street Center 201 South Jackson Street, Suite 600 Seattle, WA 98104 -3855 206 - 296 -6519 206 - 296 -0192 Fax Alice Strand City of Tukwila Department of Community Development 6300 Southcenter Boulevard, Suite 100 Tukwila, WA 98188 RE: North Wind's Weir Soil Remediation Project Funding Status — Reference Permit L04 -051 In your comment letter of October 20, 2004, you requested confirmation from King County that the North Wind's Weir project has sufficient funding to complete the project. At present, the project is fully funded for construction of Phase I, as outlined in the plans submitted for your review. Phase II will be jointly funded by both King County and the U.S. Army Corps of Engineers. King County's share of Phase II construction costs is included in the 2005 budget transmitted by King County Executive Ron Sims to the King County Council. King County considers this project to be a high- priority restoration project of regional significance and is committed to its completion. If, for some reason, the federal funds necessary for the completion of the project were unavailable, King County is committed to and will have adequate funding for restoration of the site, as required under Tukwila Municipal Code 18.54. Whether using project funds or utilizing the resources of the County's self - insurance program, any and all financial obligations rising from this project to satisfy City regulations will be available. Alice Strand October 21, 2004 Page 2 Thank you for your prompt consideration of this request. If you have any questions concerning this project, please contact me at 206 - 296 -8371. Sincerely, Don Althauser, P.E., Managing Engineer Surface Water Engineering Services Unit DA:JH:bgDI3 cc: Glenn Evans, Manager, Capital Projects and Open Space Acquisitions (CPOSA) Section, Water and Land Resources Division (WLRD) Kathy Wright, Program Manager, Endangered Species Act and Army Corps of Engineers Coordination, CPOSA Section, WLRD Robert Kniestedt, Business and Finance Officer, CPOSA Section, WLRD Jon Hansen, Senior Ecologist, Ecological Services Unit, WLRD Mark Wilgus, Senior Engineer, Surface Water Engineering Services Unit, WLRD October 20, 2004 Jon Hansen 201 S. Jackson Street, Suite 600 Seattle, WA 98104 Dear Mr. Hansen: Sine rely, u5 LS Al ce Strand S for Planner se City of Tukwila RE: North Winds Weir Intertidal Restoration: L04 -051, L04 -066 cc: Nora Gierloff, Planning Supervison Jill Mosquda, Public Works NOTICE OF COMPLETE APPLICATION Steven M. Mullet, Mayor Department of Community Development Steve Lancaster, Director Your applications for a Tree Clearing permit and a Special Permission, Director permit for deviation from tree regulations for the first phase of North Winds Weir Intertidal Restoration located at 2724 South 112 Street, Tukwila, WA have been found to be complete. on August 31, 2004 for the purposes of meeting state mandated time requirements. This determination of complete application does not preclude the ability of the City to require that you submit additional plans or information, if in our estimation such information is necessary to ensure the project meets the substantive requirements of the City or to complete the review process. Before these permits can be issued, you will need to provide a means of guaranteeing that the project has funding available to cover costs to its completion, including the replacement of trees as presented in the site plan. Because King County is a public agency, an actual bond is not needed. In lieu of a bond, the City requests a signed letter that includes the following: 1) the costs of the project to its completion 2) assurance that the project is included in the applicable capital improvement funding plan 3) assurance that full funding has been allocated to the project. This notice of complete application applies only to the permits identified above. It is your responsibility to apply for and obtain all necessary permits issued by other agencies. 6300 Southcenter Boulevard, Suite #100 • Tukwila, Washington 98188 • Phone: 206 - 431 -3670 • Fax: 206 - 431 -3665 Alice Strand - Re: North Wind's Weir Ham' -"at Restoration Project - question From: "Peter Beckwith" <asstatty @ci.tukwila.wa.us> To: <astrand @ci.tukwila.wa.us> Date: 10/19/04 3:48PM Subject: Re: North Wind's Weir Habitat Restoration Project - question I apologize for taking so long to respond to your question. I wanted to run this response by some other attorneys in the office to see if they had any more thoughts, which they did not. This e-mail is in response to a question posed to the Attorney's office regarding whether it is the business of the City to get involved in North Wind's Weir Habitat Restoration project by attaching conditions to a tree permit. As understood, this project involves three stages. A tree permit is required to remove trees that are presently on the property as part of stage one. As the tree permit is part of a larger project, it is suggested that all necessary permits be determined upfront. Due to the effect of this project on the surrounding neighbors, it is further suggested that a public notice and hearing be done for the entire project. From the public hearing, a determination can be made whether this project should go forward and what conditions, if any, should be placed on the applicant. If it is determined that the permits should be issued piecemeal, there are two issues that the City should be aware of. First, conditions attached to a permit need to relate to the permit. At this time, I cannot think of an applicable condition; however, that is not to say that you cannot. The condition suggested in the report, of the applicant providing signed letters of understanding from adjacent property owners, may allow for one holdout adjacent property owner to stall the permit. Second, in a worst -case scenario, the project may receive permits to begin the project but not receive permits to finish the job. If you have anymore questions please do not hesitate to ask. Peter Peter B. Beckwith Kenyon Disend, PLLC The Municipal Law Firm 11 Front Street South Issaquah, Washington 98027 425/392 -7090 - phone 425/392 -7071 - fax Peter @KenyonDisend.com »> "Alice Strand" <astrand @ci.tukwila.wa.us> 10/14/04 03:24PM »> Hi Shelley, King County and the Corps have applied to remove trees and contaminated soils to complete the first phase of the above project. The purpose of the completed project is to create an intertidal mudflat and saltmarsh. Extensive grading will be required to lower the elevation of this riverside property in order that the river will regularly inundate the property. This is actually moving the shoreline substantially closer to the edge of the property and also closer to neighboring properties. Some of these properties will thus be under shoreline regulations after the project is completed...when now they are not under shoreline regs. The question is this: Is it the business of the City to get involved in this problem..by attaching conditions to the special permission - tree regulations decision at this stage? (Note: although the current permit does not change the shoreline, we will be potentially granting the grading permit for this shoreline change in the future.) If it is our business, what is the best way to protect the City from liability? Please review this brief staff report..paying particular attention to highlighted areas. Please let me know Page 1 A l i c e Strand - Re: North Wind's Weir H ' ' t Restoration Project - question Page 2 if you need to meet on this to get more details. My next day in is Tuesday, October 19. It would be great to have a reply by then as I am out of the office from October 20 -31. Thanks Alice Alice Strand Senior Planner Department of Community Development City of Tukwila 6300 Southcenter Blvd Tukwila, WA 98188 voice 206 -431 -3655 fax 206 -431 -3665 astrand @ci.tukwila.wa.us October 12, 2004 Jon Hansen 201 S. Jackson Street, Suite 600 Seattle, WA 98104 Dear Mr. Hansen, Singerely, lice Strand enior Planner City of Tukwila Department of Community Development Steve Lancaster, Director RE: North Winds Weir Remediation L04 -051 and L04 -066 — consistency (per WAC 173 -27- 040 (2)(p) with King County Shoreline Management Master Program as administered by the City of Tukwila The above referenced project lies in a shoreline area regulated under the King County Shoreline Management Master Program, which is administered by the City of Tukwila. The City of Tukwila has reviewed the above referenced project design and related state and federal permits. Based upon this review, the City of Tukwila believes that the project is consistent with the King County Shoreline Management Master Program (KCSMMP). The North Winds Weir Soil Remediation is the first phase of a habitat restoration project on the lower Green/Duwamish River. Phase one of the project involves the removal of contaminated soils from the area, preventing future leaching and erosion of these contaminants into the river. The second phase includes alteration of the site to restore intertidal habitat with the intent of specifically providing mudflat and saltmarsh habitats suitable for rearing and foraging by juvenile salmonids as well as other wildlife. Pedestrian trails and interpretive signage will be a feature of the completed project. The project is located within the shoreline area designated "urban environment" under the KCSMMP. While this area is geared toward higher intensity uses, KCSMMP policies also include emphasis on the priority and value of developing visual and physical access to the shoreline and preventing degradation of the quality of the environment...both goals of this project. While KCSMMP policies also serve to protect water quality and aquatic life from the disturbance and destruction caused by grading and dredging, NEPA and SEPA environmental documents related to the project conclude that while there are minor impacts associated with the alteration of the existing site, the benefits to both fish and wildlife habitat are substantial. Steven M. Mullet, Mayor - 6300 Southcenter Boulevard, Suite #100 • Tukwila, Washington 98188 • Phone: 206 - 431 -3670 • Fax: 206 - 431 -3665 October 7, 2004 King County Water and Land Resources Division ATTENTION: Jon Hansen, Senior Ecologist 201 South Jackson Street, Suite 600 Seattle, Washington 98104 -3855 —So Dear: SUBJECT: North Wind's Weir Intertidal Restoration Project, Written Approval for Shorelines Exemption Application, Proposed Off Channel Refuge Area Habitat, Tributary to Duwamish River, King County, WRIA 09.0001 The Washington Department of Fish and Wildlife (WDFW) has reviewed the above referenced project design and performed a field review of the site. Based upon these reviews, WDFW believes the project should meet the criteria of Washington Administrative Code 173 -27 -040 (2)(p) for an exemption from a Shoreline Substantial Development Permit. This project is expected to provide valuable interdidal habitat for several species of salmonid fish and a variety of wildlife species. Chinook and chum salmon in particular are expected to benefit from the project. This category of habitat is severely lacking in the Duwamish River due to the pattern of its elimination as a result of diking and dredging to accomodate commercial and industrial development. The restoration of rearing and foraging habitat for juvenile fish is an important element in salmon recovery efforts in the Green/Duwamish River system. Thank you for the opportunity to provide these comments. If there are any questions concerning this, I may be contacted at 425 -649 -7042 or fisheldf @dfw.wa.gov. WDFW appreciates your cooperation in our efforts to preserve, protect, perpetuate, and manage the fish and wildlife resources of the state of Washington. Sincerely, Larry Fisher Area Habitat Biologist LF:lf:kcdnrhansen.wpd State of Washington DEPARTMENT OF FISH AND WILDLIFE Region 4 Office: 16018 Mill Creek Boulevard - Mill Creek, Washington 98012 - (425) 775 -1311 JN id O1 a 901zt C13/\13031.1 II RAULIC PROJECT APPRO, Ditctimeld RCW 77.55.100 - appeal pursuant to Chapter 34.05 RCW 11811aad WOLK PATE OF ISSUE: September 8.200 OLD sck o PERMITTEE King County Department of Natural Resources and Parks Water and Land Resources Division ATTENTION: Jon Hansen 201 South Jackson Street, Suite 600 Seattle, WA 98104 -3855 (206) 296-1966 AUTHORIZED AGENT OR CONTRACTOR Not Applicable PROJECT DESCRIPTION: New Permanent Fixed Estuarine on Bed Combination Habitat Refuge Area Off Channel PROJECT LOCATION: 2724 South 112'" Street, Tukwila, Washington 4730334 North Latitude, 122.29654 West Longitude WRIA WATER BODY 1 09.0001 Duwamish River TRIBUTARY TO Elliot Bay PROVISIONS COUNTY King 1. TIMING LIMITATIONS: The project may begin immediately and shall be completed by September 8, 2009, provided that excavation of the outlet of the off channel habitat area to the river shall occur at low tide between July 1 and August 15. Page 1 of 4 State of Washington . Department of Fish and Wildlife Habitat Program 600 Capitol Way North, MS 3155 Olympia, Washington 98501 -1091 J QG NUMBER: ST- G1586 -01 J14 SEC. ,SEC. TOWNSHIP RANGE SE 04 23 North 04 East 2. NOTIFICATION REQUIREMENT: The Area Habitat Biologist listed below shall be contacted at least three working days prior to start of work, and again within seven days of completion of work to arrange for compliance inspection for each significant component of the project. 3. Work shall be accomplished per plans and specifications entitled, "NORTH WINDS WEIR INTERTIDAL RESTORATION", dated December 23, 2003, submitted to the Washington Department of Fish and Wildlife, except as modified by this Hydraulic Project Approval. These plans reflect design criteria per Chapter 220 -110 WAC. These plans reflect mitigation procedures to significantly reduce or eliminate impacts to fish resources. A copy of these plans shall be available on site during construction. 4. During excavation, the new off channel area shall be isolated from the Duwamish River by not disturbing the existing riverbank at the proposed outlet. The undisturbed portion of riverbank at the proposed outlet shall be substantial enough to prevent flood flows at high tide from entering the new off channel area during construction. 5. The fish habitat log structures shall be of fir, cedar, or other approved coniferous species. 6. Before excavating the outlet of the off channel area to the Duwamish River, project grading shall be complete approved fish habitat components, streambed materials and bank protection to prevent erosion shall be in place. 7. Fish habitat components and bank protection material shall be installed to withstand the 100 year peak flows. H,,)RAULIC PROJECT APPRO„ 1L State of Washington RCW 77.55.100 - appeal pursuant to Chapter 34.05 RCW Department of Fish and Wildlife Habitat Program Vo 600 Capitol Way North, MS 3155 V Olympia, Washington 98501 -1091 ff p0`\ PATE OF ISSUE: September 8. 2004 �` ti JOG NUMBER: ST- G1586 -01 O o �r�oe� o o 8. Equipment used for this project shall be free of externa leum -based products. Equipment shall be checked daily for leaks and any necessary repairs shall be completed prior to commencing work activities. 9. .Alteration or disturbance of the existing intertidal habitat outlet shall be limited to that necessary to construct the project. Within seven calender days of project completion, all disturbed areas shall be protected from erosion using vegetation or other means. Prior to the start of the first growing season (March 1) following project grading, the approved planting plan (Provision 3) shall be installed. Plantings shall be maintained as necessary for three years to ensure 80 percent or greater survival. apnoea d lead WILDW 10. flat any time, as a result of project activities, fish are observed in distress, a fish kill occurs, or water quality problems develop (including equipment leaks or spills), operations shall cease and the Washington Department of Fish and Wildlife at (425) 649 -7042 and Washington Department of Ecology at (425) 649 -7000 shall be contacted immediately. Work shall not resume until further approval is given by the Washington Department of Fish and Wildlife. 11. Erosion control methods shall be used to prevent silt -laden water from entering the river during excavation of the outlet of the off channel area. These may include, but are not limited to, straw bales, filter fabric, floating turbidity curtain, pea gravel -filled burlap bags, and/or immediate mulching of exposed areas. 12. Prior to starting work, the selected erosion control methods (Provision 11) shall be installed. Accumulated sediments shall be removed during the project and prior to removing the erosion control methods after completion of work. 13. Wastewater from project activities and water removed from within the work area shall be routed to an area landward of the ordinary high water line to allow removal of fine sediment and other contaminants prior to being discharged to the river. 14. All waste material such as construction debris, silt, excess dirt or overburden resulting from this project shall be deposited in an approved disposal site. 15. If high flow conditions that may cause siltation to the Duwamish River are encountered during this project, work shall stop until the flow subsides. 16. Extreme care shall be taken to ensure that no petroleum products, hydraulic fluid, fresh cement, sediments, sediment - laden water, chemicals, or any other toxic or deleterious materials are allowed to enter or leach into the river. SEPA: DNS by King County DNRP final on June 10, 2004 APPLICATION ACCEPTED: September 8, 2004 ENFORCEMENT OFFICER: Chandler 134 [P2] Larry Fisher (425) 649 -7042 Area Habitat Biologist for Director WDFW Page 2 of 4 I)RAULIC PROJECT APPROIL RCW 77.55.100 - appeal pursuant to Chapter 34.05 RCW APPEALS - GENERAL INFORMATION Page 3 of 4 State of Washington Department of Fish and Wildlife Habitat Program 600 Capitol Way North, MS 3155 Olympia, Washington 98501 -1091 PATE OF ISSUE: September 8. 2004 t OQ G PRR �C IONS o � This Hydraulic Project Approval (HPA) pertains only to tivisions of the Fisheries Code (RCW 77.55 - formerly RCW 75.20). Additional authorization from other public agencies may be necessary for this project. LOG NUMBER: ST- G1586 -01 This HPA shall be available on the job site at all times and all its provisions followed by the permittee and operator(s) performing the work. This HPA does not authorize trespass. The person(s) to whom this HPA is issued may be held liable for any loss or damage to fish life or fish habitat which results from failure to comply with the provisions of this HPA. Failure to comply with the provisions of this Hydraulic` Project Approval could result in a civil penalty of up to one hundred dollars per day or a gross misdemeanor charge, possibly punishable by fine and/or imprisonment. All HPAs issued pursuant to RCW 77.55.100 or 77.55.200 are subject to additional restrictions, conditions or revocation if the Department of Fish and Wildlife determines 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 HPAs issued pursuant to RCW 77.55.110 may be modified by the Department of Fish and 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 77.55.170. IF YOU WISH TO APPEAL A DENIAL OF OR CONDITIONS PROVIDED IN A HYDRAULIC PROJECT APPROVAL, THERE ARE INFORMAL AND FORMAL APPEAL PROCESSES AVAILABLE. A. INFORMAL APPEALS (WAC 220 -110 -340) OF DEPARTMENT ACTIONS TAKEN PURSUANT TO RCW 77.55.100, 77.55.110, 77.55.140, 77.55.190, 77.55.200, and 77.55.290: A person who is aggrieved or adversely affected by the following Department actions may request an informal review of: (A) The denial or issuance of a HPA, or the conditions or provisions made part of a HPA; or • (B) An order imposing civil penalties. It is recommended that an aggrieved party contact the Area Habitat Biologist and discuss the concerns. Most problems are resolved at this level, but if not, you may elevate your concerns to his/her supervisor. A request for an INFORMAL REVIEW shall be in WRITING to the Department of Fish and Wildlife, 600 Capitol Way North, Olympia, Washington 98501 -1091 and shall be RECEIVED by the Department within 30 -days of the denial or issuance of a HPA or receipt of an order imposing civil penalties. The 30-day time requirement may be stayed by the Department if negotiations are occurring between the aggrieved party and the Area Habitat Biologist and/or his/her supervisor. The Habitat Protection Services Division Manager or his/her designee shall conduct a review and recommend a decision to the Director or its designee. If you are not satisfied with the results of this informal appeal, a formal appeal may be filed. . B. FORMAL APPEALS (WAC 220 -110 -350) OF DEPARTMENT ACTIONS TAKEN PURSUANT TO RCW 77.55.100 OR 77.55.140: A person who is aggrieved or adversely affected by the following Department actions may request an formal review of: (A) The denial or issuance of a HPA, or the conditions or provisions made part of a HPA; (B) An order imposing civil penalties; or 1 •• H,..)RAULIC PROJECT APPRO, ,41 RCW 77.55.100 - peal pursuant to Chapter 34.05 RCW � c \31 1. G ps (C) Any other "agency action" for which an adjudicate proceeding is required under the Administrative Procedure Act, Chapter 34.05 RCW. A request for a FORMAL APPEAL shall be in WRITING to the Department of Fish and Wildlife, 600 Capitol Way North, Olympia, Washington 98501 -1091, shall be plainly labeled as "REQUEST FOR FORMAL APPEAL" and shall be RECEIVED DURING OFFICE HOURS by the Department within 30 -days of the Department action that is being challenged. The time period for requesting a formal appeal is suspended during consideration of a timely informal appeal. If there has been an informal appeal, the deadline for requesting a formal appeal shall be within 30 -days of the date of the Department's written decision in response to the informal appeal. C. FORMAL APPEALS OF DEPARTMENT ACTIONS TAKEN PURSUANT TO RCW 77.55.110, 77.55.200, 77.55.230, or 77.55.290: A person who is aggrieved or adversely affected by the denial or issuance of a HPA, or the conditions or provisions made part of a HPA may request a formal appeal. The request for FORMAL APPEAL shall be in WRITING to the Hydraulic Appeals Board per WAC 259-04 at Environmental Hearings Office, 4224 Sixth Avenue SE, Building Two - Rowe Six, Lacey, Washington 98504; telephone 360/459 -6327. Ikpartna FISHad WILDLIFE PATE OF ISSUE: September 8. 2004 Page 4 of 4 State of Washington Department of Fish and Wildlife Habitat Program 600 Capitol Way North, MS 3155 Olympia, Washington 98501 -1091 TAG NUMBER: ST 61586 - 01 D. FORMAL APPEALS OF DEPARTMENT ACTIONS TAKEN PURSUANT TO CHAPTER 393, LAWS OF 2003: A person who is aggrieved or adversely affected by the denial or issuance of a HPA, or the conditions or provisions made part of a HPA may request a formal appeal. The FORMAL APPEAL shall be in accordance with the provisions of Chapter 393. The request for FORMAL APPEAL shall be in WRITING to the Environmental and Land Use Hearings Board. E. FAILURE TO APPEAL WITHIN THE REQUIRED TIME PERIODS RESULTS IN FORFEITURE OF ALL APPEAL RIGHTS. IF THERE IS NO TIMELY REQUEST FOR AN APPEAL, THE DEPARTMENT ACTION SHALL BE FINAL AND UNAPPEALABLE. CENWS- PM -PL -ER ftpv � t v( Maintenance and Monitoring Plan co��oe0 North Wind's Weir Intertidal Restoration U 8ject January 28, 2004 1. Introduction The U.S. Army Corps of Engineers, Seattle District (Corps) and the King County Department of Natural Resources and Parks, Water and Land Resources Division (King County DNRP) are proposing to restore intertidal mudflat and marsh habitat along the lower Duwamish River. Restoration is needed because nearly all intertidal marsh and mudflat habitats of the Duwamish River have been eliminated as a result of dredging and filling of the estuary for urban and industrial development; only about 1 percent of an estimated 4,000 acres of tidal and intertidal habitat remains today. As a result, the river and its estuary have lost the ecological functions of these intertidal areas, including critical rearing and refuge habitat for juvenile salmon. The majority of the project area has been excavated and filled with industrial debris, and much of the shoreline has been armored. As a result, the project area is substantially elevated above the river, isolated from tidal influence, inaccessible to fish, and virtually uninhabitable by native vegetation and wildlife species. The Corps and its partner agencies are therefore proposing to remove the historic fill and shoreline armoring and restore the connection of this site to the river and the tides. This project would restore critical intertidal functions such as foraging and refuge habitat for juvenile salmon by restoring mudflat, marsh, and riparian habitats. Upon completion of the project, King County DNRP will ensure that site maintenance and monitoring are conducted according to this plan. 1.1 Project Objectives The purpose of the North Wind's Weir Intertidal Restoration Project is to restore important intertidal habitat within the lower Duwamish River, with the intent of specifically providing mudflat and saltmarsh habitats suitable for rearing and foraging by juvenile salmonids. This will be accomplished by removing the fill and regrading the site to intertidal elevations, reconnecting the site to the river, restoring the natural shoreline, and planting native intertidal and riparian vegetation. As the result of this project, the native habitats and natural processes conducive to the survival of juvenile salmonids would be restored at this site. The resulting intertidal mudflat, salt marsh, and riparian habitats would provide critically important transitional habitat where juvenile salmonids would have the opportunity to feed, rest, and undergo smoltification prior to out - migrating through Puget Sound to the Pacific Ocean. These habitats would also provide important refuge, foraging, and perhaps breeding habitat for a variety of other urban- adapted native fish and wildlife species. The objectives of the North Wind's Weir Intertidal Restoration project include: 1. restoration of natural intertidal mudflat, saltmarsh, wetland and riparian habitats; 2. preservation of the existing saltmarsh to the greatest extent possible, and 3. creation of habitat conditions conducive to juvenile salmonid rearing. 1.2 Location REGE OC I12 DEVELOP ' The project area is located along the eastern bank of the lower Duwamish River at approximately River Mile 6.2, in the southeast quarter of Section 4, Township 23 North, Range 4 East, within the City of Tukwila Washington (Figure 1). The project area encompasses approximately 3.27 acres (including areas waterward of Mean Higher High Water that are exposed at low tide), and is bordered on the west by the Duwamish River and a fringe of intertidal habitats, to the north by Seattle City Light property, to the east by an existing industrial facility (Pacific Strapping Inc.), and to the south by South 112 Street. The project area is directly across the river from an intertidal habitat restoration project (the Cecil B. Moses Park) recently completed in early 2003. Existing land use consists of vacant industrial land on historic fill material. Property topography is flat, with 0 to 3 percent slopes. Approximately 11 feet in elevation below the eastern edge of the site, a small patch of intertidal saltmarsh dominated by Lyngby's sedge (Carex lyngbyei) and an extensive area of unvegetated mudflat fringe the Duwamish River. 2. Maintenance and Protection The restored habitats are designed to ultimately be self - sustaining. However, to ensure success of the plantings and the ultimate development of the targeted plant communities and habitats, certain maintenance and protection activities will be conducted. King County DNRP (as the local sponsor) will be responsible for the long -term maintenance of the site. Maintenance and protection activities will include: • Replacement of dead plants during the first year post - construction, including substitution of unsuccessful species to obtain targeted percent cover performance criteria for the site. Trees and shrubs that die over time would not be removed unless they pose a direct threat to safety of people or property. • Spring and fall inventories and removal of invasive species to be repeated annually for the first five years post - construction. Invasive species such as Himalayan and cut leaf blackberry, reed canarygrass, purple loosestrife, English ivy, butterfly bush, Scot's broom, and Japanese knotweed would be diligently controlled using manual methods to the greatest extent possible. Other control methods, including limited spot application of approved herbicide, could be employed if necessary if manual removal is not effective. • Weed control matting, protective tree collars, chemical browse- repellants, or other measures would be implemented, as necessary to limit competitive pressures or browse damage to plantings. • Irrigation of riparian and upland buffer plantings as necessary from the end of May through the end of October as warranted by regional weather or on -site soil conditions. The Corps will be responsible for irrigation of the riparian and upland buffer plantings for 2 years post construction; King County DNRP would be responsible for irrigation of the site if necessary after the two -year period of Corps irrigation is completed. • King County Sensitive Area signage will be placed along the outer perimeter of the site to identify the area a sensitive landscape feature. Interpretive signage has been incorporated into the site plan to provide educational functions for site visitors. 3. Monitoring 'sew 11 11W 3.1 Pre- construction and Construction Monitoring Because the success rate of restoration efforts is increased through the coordination and communication between all parties before and during construction, monitoring by the project biologists from King County DNRP and the Corps will take place during construction. A pre - construction meeting of the personnel responsible for the design and those responsible for implementation of the restoration site will take place prior to the onset of construction. The purpose of the meeting would be to review the intent of the restoration plan, establish a pathway of communication during construction, agree upon the construction sequence, and address and resolve any questions: As this is a habitat restoration project, the biological elements are critical to the design and ultimate success of the project. Therefore, the project biologists from King County DNRP and the Corps will play a significant role in all decisions regarding project construction. The project biologists will be present on -site during all stages of the restoration process, including but not limited to: (1) placement and monitoring of the temporary erosion and sediment control measures; (2) final grading and approval of materials such as topsoil and logs; (3) placement of habitat structures; (4) inspection of the plant materials and recommendation for their final placement before planting; (5) determining the correct type and application rate of amendments to the soil, if needed; (6) making adjustments in planting plans, as needed, in response to as-built field conditions; (7) ensuring that construction activities are conducted per the approved plan; and (8) resolving problems that arise during implementation, thus lessening problems that might occur later during the post - construction monitoring phase. The project biologists will also document the `as- built' site conditions (including elevations, number and species of installed plants, area of native marsh, and photo points) immediately following construction to create a baseline condition against which the future evolution of the site will be measured. 3.2 Post - Construction Monitoring As a restoration project, we expect this site will be dynamic and will evolve in accordance with the tidal regime, river flow, and sediment accumulation once we have set the appropriate stage by removing the fill material and creating appropriate elevations. Thus, strict achievement of predetermined `performance standards' will not necessarily predict the success or reveal the failure of the restoration effort. The monitoring and evaluation will be flexible and will focus on determining whether the overall goals and objectives of the restoration are being met, as measured by performance targets. We will also use `monitoring metrics', which do not have specific performance targets associated with them, in order to document some of the more unpredictable aspects of the development and use of the site. Evaluation of the evolution of the restored habitats will be based on the establishment of the targeted habitats within the restoration site and on the ecologic functioning of those habitats. All post - construction monitoring will be conducted in years 1, 3, and 5 following construction. Data collection will be used to further the understanding of estuarine RECEIVED ` • `'► oci 12 200 \ m�vE. OPh r restoration in an urban setting, with the focus on the development of mudflat and intertidal marsh habitats and their use by juvenile salmonids. Data collected will be integrated into the larger volume of fish -use data that has been gathered in the lower Duwamish River as part of the Green - Duwamish Ecosystem Restoration General Investigation. The Corps and King County DNRP will use the knowledge gained through this restoration project to adaptively manage the project site and to improve the design and implementation of future restoration efforts in the area. 3.2.1 Evaluation of Specific Objectives Objective 1: Restoration of natural intertidal mudflat, saltmarsh, wetland, and riparian habitats Performance Target 1, Aerial extent of mudflat and saltmarsh habitats: By the end of the five -year post - construction monitoring period, the majority of the site will support intertidal mudflat and saltmarsh habitats, as determined by direct measurement of the square footage of the site that supports unvegetated intertidal mudflat and native saltmarsh communities having no more than 10% coverage by invasive plant species. Photo points will be established at least four locations around the site and photographs will be taken at the same location and angle to document the development of the site over the monitoring period. Aerial extent measurements and photo points will take place near the height of the growing season for saltmarsh vegetation (generally mid - August to September). Performance Target 2, Plant survival: Because the river and tides will likely make adjustments in the elevations of the site, changes in the relative proportions of the site supporting mudflat and marsh communities are expected and will influence the number, species, and distribution of plants on the site. Plant survival would be assessed by counting (and marking for replacement) all dead trees and shrubs, and subtracting that number from the plant quantities listed on the As -Built planting plan. Plant mortality in excess of these standards would be replaced with the same species or a substitute species (depending on the extent and cause of the mortality) in quantities appropriate to maintain the survival and percent cover standards desired for this project. Planted and desirable volunteer trees and shrubs should be healthy and have a survival rate of: • 100% after one year (per one year guarantee on plant materials), • 80% after two years, and every year thereafter through the end of the five - year monitoring period. Because it is difficult to count each individual emergent plant installed over such a large area, the survival of the emergent plants would be determined based largely on the percent coverage of the plants (as detailed in Performance Standard 3, below). In areas where a particular emergent species has failed to thrive, it would be replaced by another emergent species that has survived well on the site at a similar elevation. If particular areas of the site . do not support the anticipated emergent species due to lower elevations or greater durations of inundation, no plants will be replaced in these areas. They will be left to develop as unvegetated mudflat communities. Cover Type Emergent saltmarsh community Scrub -Shrub and Forested Wetland Community (trees and shrubs) Riparian Forested Community (trees and shrubs) OCZ Performance Target 3, Percent coverage of plants: Percent coverageTaatasured within plots of a standard 30 -foot diameter using the Braun - Blanquet cob- abundance technique, or other similar methodology. We anticipate that site elevations will gradually change over time as the river and the tides redistribute sediments. The target percent cover will be initially applied to sample plots within areas anticipated to support the target plant communities based on `as- built' elevations, but may ultimately be applied to other areas of the site which evolve into the target communities. The condition the project is trying to achieve is for the planted and desirable volunteer tree, shrub, and herbaceous species to provide a minimum of the targeted percent cover as follows, or for the plants to be healthy, unsuppressed by invasive species, and expanding at a rate acceptable to the project team. This provision is intended to accommodate slower than anticipated growth due to unanticipated site conditions or the need for implementation of contingency measures: Years After Planting Target % Coverage One year 30% Three years 50% Five years 70% One year 25% Three years 35% Five years 50% One year 25% Three years 35% Five years 50% Monitoring Metric, Wildlife Habitat Functions: There are no specific performance standards for this metric. Data collected will be used to document use of restored habitats by wildlife and would be added to the data set of wildlife use of other restoration sites in the lower Duwamish River. Increases in wildlife habitat functions would be documented primarily by seasonal bird surveys conducted at the site at least three times per year, generally timed in the early spring, summer, and winter to document the greatest diversity of bird species using the restoration site. Incidental observations of mammals, reptiles, and amphibians made during any site visit would also be recorded. Objective 2: Preservation of the existing saltmarsh to the greatest extent possible by salvaging and reestablishing disturbed portions Monitoring Metric, Salvaging and Reestablishment of Natural Marsh: No specific performance standards are anticipated due to the experimental nature of the salvaging operation. However, area and percent cover of the salvaged portions of the saltmarsh will also be measured and reported. Based on similar work conducted in British Columbia on the Frasier River, we anticipate that at least 50% of the salvaged marsh will survive and ultimately spread over the restored emergent area. Objective 3: Creation of habitat conditions conducive to juvenile salmonid rearing I■/ RECEIVED 0(;T 12 200k Monitoring Metric 1, Fish Use: No specific performance standards are anticipa edQ� use of the restoration site. Fish use data will be gathered to document the extent ArLOPMENT frequency of fish use of the restoration site and to compare that use with other restoration and reference sites on the lower Duwamish River. Sampling of juvenile salmonid use of the restoration site will be conducted by deploying a fyke net, across the mouth of the tidal channel (or by other appropriate sampling means) to capture fish using the restoration site. Nets will be deployed at or near high slack tide and retrieved at low tide when the site has dewatered. Fish use will be sampled every two weeks between the beginning of February and the end of June during each of the monitoring years following construction (years 1, 3, and 5). Species, wild or hatchery, wet weight, and fork length will be recorded for each fish captured. We will also scan for coded wire tags within the captured juvenile fish and transmit our data regarding their use of the site to the appropriate researcher responsible for tracking the tagged fish. Monitoring Metric 2, Fish Diet: A subset (by size - class) of the fish caught during the fish use sampling efforts will be lavaged for subsequent diet analysis using a garden sprayer fitted with a small nozzle and hose to rinse stomach contents from the fish's foregut into a sieve. NOAA Fisheries and Washington Department of Fish and Wildlife collection permits will determine the numbers of fish sampled for diet analysis. Stomach contents will then be preserved and analyzed to determine the taxonomic group (to family or genus as applicable) of the organisms the fish had recently fed upon and that data compared with fish use and diet data collected at other restoration sites within the lower Duwamish River. Monitoring Metric 3, Availability of benthic and epibenthic invertebrate prey: Benthic and epibenthic invertebrates will be sampled using a 5cm inner diameter core taken to a depth of 15cm. Cores will be collected within the mudflat and saltmarsh communities during one sampling event in the spring and one in the summer of each of the sampling years post construction (years 1, 3, and 5). Cores will be sieved through sieves nested down to a 0.25mm mesh and the samples analyzed to determine the taxonomic group of the prey organisms generated at the restoration site and available to juvenile salmonids as prey. 4. Adaptive Management and Contingencies Potential scenarios that would require adaptive management of the site, along with conceptual approaches to correct problems, are presented below. Specific corrective actions would be determined based on site conditions and project history and would be determined collectively by King County DNRP and the Corps. Potential Scenario: Less than the targeted percent survival of planted vegetation species. Potential corrective actions: replanting to maintain targeted plant survival, substitution of failing species with different species more appropriate for site conditions. Potential Scenario: Percent coverage of plant not steadily increasing and/or does not meet targeted percent cover. Potential corrective actions: replanting, more aggressive invasive species control, substitution of species, fertilizer, soil amendment, irrigation, browse control measures, or other remedial actions to correct potential causes of poor growth. rr RECEIVED OCT 12 200'' Potential Scenario: Blackberry, knotweed, loosestrife, reed canarygrass, Scot's bgeZMENT English ivy, butterfly bush or other non - native, invasive plants constitute greater than 10% coverage of the restoration site. Potential corrective actions: manual removal, herbicide application, or mechanical grubbing of plants, off -site disposal required. Potential Scenario: Erosion or sedimentation at mouth of tidal channel or within the site, could result in site not draining completely at out -going tides and the stranding of juvenile salmonids (or other fish) within the restoration site at low tides. Potential corrective actions: determine the process creating the erosion or sedimentation, reconfiguration of tidal channel, regrading of elevations, removing accumulated sediments to reconnect to the river, placing large woody debris to change flow dynamics, opening a new channel to increase flow through the site, possible reinforcement of mouth of tidal channel if other techniques or options do not work and site is in danger of self - destructing. Note: the intention of the project is for the shoreline to be naturally deformable to the greatest extent possible. 4.1.1. Initiating Procedures Contingency measures would be implemented if the monitoring program (or any other documented observations by qualified personnel) indicates an issue. The Corps and King County DNRP, in coordination with regulatory and funding agencies, would assess the issues and initiate the implementation of corrective actions to address the identified issue. 4.1.2. Responsible Parties The contingency plan may require extension of the monitoring phase of the project, especially if major changes in the plan are required. The project biologists and engineers, in consultation with agency personel, would make recommendations for identified problems. The parties responsible for implementation of the restoration plan and any associated contingencies are as follows: Project Manager KCDNRP: Project Manager Corps: Project Biologists Corps: Mr. Jon Hansen King County Department of Natural Resources and Parks 206 - 296 -1966 Mr. Noel Gilbrough U.S. Army, Corps of Engineers, Seattle District 206 - 764 -3652 Mr. Michael Scuderi U.S. Army, Corps of Engineers, Seattle District 206 - 764 -7205 Ms. Torrey Luiting U.S. Army, Corps of Engineers, Seattle District 206 - 764 -4476 King County Water and Land Resources Division Department of Natural Resources and Parks King Street Center 201 South Jackson Street, Suite 600 Seattle, WA 98104 -3855 206- 296 -6519 206- 296 -0192 Fax October 1, 2004 Laurie Werle Administrative Support Technician City of Tukwila Department of Community Development 6300 Southcenter Boulevard, Suite 100 Tukwila, WA 98188 RE: North Wind's Weir Soil Remediation Special Permission Director Justification — Reference Permit L04 -051 Dear Ms. Werle: 113Inw 3Ago hOVc '17 0 IJ0 O3AEJ 33 The King County Department of Natural Resources and Parks (DNRP), in partnership with the U.S. Army Corps of Engineers (Corps), is requesting Special Permission from the Director so we can proceed with the first phase of a large habitat restoratiodproj ect on the lower Green/ Duwamish River. We are seeking relief from the standards of the Tree Clearing section of the Tukwila Municipal Code (TMC 18.54). Our goal is not to avoid compliance with City regulations, but to be granted permission to pursue a different strategy we believe will yield much greater environmental benefits. To assist the Director in the review of this request, background information about the project, a list of the items requiring special permission, and justification for the proposed deviations are outlined below. Project Background King County in partnership with the Corps is proposing to convert a 2.59 - acre upland site along the east side of the Duwamish River into approximately 2.3 acres of mudflat, emergent marsh, and scrub - shrub wetland. The balance of the site (0.29 acre) will be planted with riparian trees and shrubs and contain a trail and interpretive signs. To create those conditions, King County and the Corps plan to remove approximately 65,000 cubic yards of existing material from the site. This scale of excavation is necessary if we are to achieve the planned elevations for the intertidal mudflat and marsh. Unfortunately, this will also require the removal of all existing vegetation. Although there is impact associated with the loss of the trees on the property, it is our position that the proposed habitat enhancement project will provide far greater habitat value than the existing site. While not a direct match with Tukwila's significant tree replacement standards, we plan to plant a wide variety of vegetation, including trees and shrubs in the upland and wetland fringe areas. Laurie Werle October 1, 2004 Page 2 Need for Special Permission Because of timing constraints and funding issues, the project is being split into two distinct phases that are being permitted separately. Phase 1 involves the removal of contaminated soils, while Phase 2 will involve the creation of the intertidal marsh. During the initial review of the Phase 1 permit application, City staff identified several areas where the Phase 1 plans did not meet current regulations, in particular the Tree Clearing code as outlined in TMC 18.54. Where possible, modifications to the plans have been made to ensure compliance with those standards. Those revisions are reflected in the plan set submitted as part of this package. In several areas, however, it has become clear that the standards cannot be met without changing the character of the project and/or implementing elements that simply are not appropriate for the proposed site conditions. In these instances, we are requesting a Special Permission - Director waiver to allow the project to proceed with the proposed design. Specifically, we are requesting the following modifications from TMC 18.54 and other relevant code sections: • Reducing the number of trees required to mitigate the loss of significant trees and cottonwoods within 100 feet of the Shorelines; • Reducing the size of replacement trees required to be planted; • Waiving the requirement for the posting of a bond/security; • Waiving certain plan requirements that relate to the landscaping plan; and • Allowing for the revegetation to be completed later in time (following Phase 2), after the additional site grading has been completed. Justification/Rationale for Request The purpose of the North Wind's Weir Intertidal Restoration Project is to restore important intertidal habitat within the lower Duwamish River, with the intent of specifically providing mudflat and saltmarsh habitats suitable for rearing and foraging by juvenile salmonids. This will be accomplished by removing fill material and regrading the site to intertidal elevations, reconnecting the site to the river, restoring the natural shoreline, and planting native intertidal and riparian vegetation. As a result of this project, the native habitats and natural processes conducive to the survival of juvenile salmonids would be restored at this site. King County and the Corps have invested considerable time and money this habitat enhancement project. Both have also produced a number of environmental documents used to describe the project and secure federal and state funding as well as demonstrate compliance with environmental regulations. Those documents include: • U.S. Army Corps of Engineers. North Wind's Weir Intertidal Restoration Project — Draft Environmental Assessment • U.S. Army Corps of Engineers. Green - Duwamish Ecosystem Restoration Study Laurie Werle October 1, 2004 Page 3 • King County. State Environmental Policy Act (SEPA) Checklist and Determination of Non - Significance • U.S. Army Corps of Engineers. Biological Assessment, Ecosystem Restoration Projects, Green - Duwamish • U.S. Army Corps of Engineers. North Wind's Weir Intertidal Restoration Project Monitoring and Maintenance Plan • Site Assessment Reports • CDM Consultants. North Wind's Weir Cleanup Action Plan In the NEPA and SEPA documents, the potential impacts to the site as well as the potential habitat benefits from the project are analyzed. The conclusion of those documents is that while there are minor impacts associated with the alteration of the existing site, the benefits to both fish and wildlife habitat resulting from the project are substantial. In addition, the removal of contaminants from the site helps protect the Duwamish River from future releases that might occur due to leaching or erosion. Number of Trees Once the site is graded as proposed, the majority of the property will be regularly inundated by tidal waters and therefore cannot support tree species. The 0.29 acre above regular tidal inundation will be densely planted with native trees and shrubs in accordance with site conditions, including slope, expected soil moisture level, shade /sun tolerance, and proximity to adjacent utilities and improvements. The presence of the Seattle City Light powerlines to the north and the existing industrial building and concrete retaining wall to the south further restricts the species that can be planted in those areas. The planting plan submitted along with this letter shows the number and spacing of native trees and shrubs proposed. Given the nature of the habitat being created and the limitations of the site, it is King County's position that we have proposed as many trees as possible and that can appropriately be accommodated. Plant Sizes According to TMC 18.54, significant trees removed must be replaced by trees with a minimum 2.5 -inch caliper. While it is laudable to attempt to replace mature trees with large specimens, it has been King County's experience that such large trees do poorly on restoration sites. Large materials are much more expensive and difficult to install, and they also tend to take longer to acclimate to site conditions. As a result, they have higher mortality rates and a slower growth rate for the first two to three years. Smaller materials, by comparison, show less adverse impacts from being transplanted, possibly because there is less root mass damage and they are less accustomed to artificially favorable nursery conditions. Unlike traditional developments where larger trees are incorporated into easily accessible and highly maintained landscapes, restoration sites typically are much harsher settings. Planted materials installed at mitigation sites typically receive much less maintenance and therefore must Laurie Werle October 1, 2004 Page 4 depend on heartier stock accustomed to the anticipated conditions. Given our more favorable experience with smaller materials, we ask that the City waive the minimum size requirement. Plan Set Requirements Tukwila Municipal Code sets out very specific requirements for planting plans that are submitted to demonstrate how projects will mitigate the removal of Significant Trees. Although not explicitly stated, the specificity requested in those plans would suggest that a very detailed landscaping plan for all proposed landscaping/revegetation planned for the site would be shown to the same level. While King County has every intention of submitting a detailed planting plan to the City for review, we had anticipated submitting that as part of the Phase 2 permit application package. At this time, we have a planting plan that shows the proposed tree species, sizes, and distribution, but very little detail on other plant species. Given that the City will have an opportunity to review and approve the final plan as part of Phase 2, we are hopeful that the Director will grant King County special permission to proceed with Phase 1 work before the final planting details are ready. If, for any reason, the Phase 2 work were not to proceed, King County will revegetate the site as required by TMC. Bond /Security Instrument King County DNRP has not typically been required to post bonds or separate security instruments for habitat projects we have completed. This has been the case both in unincorporated areas as well as within local jurisdictions. Presumably, this is based on the fact that King County is self - insured and can guarantee that any and all financial obligations arising from the project will be met. There is precedence for a waiver of this requirement in King County, where the County's Department of Development and Environmental Services does not require public agencies to post bonds. The rationale is that as fellow Public Agencies, they too have an obligation to the citizens to adhere to all local, state, and federal regulations. In addition, a public agency is less of a risk and is unlikely to default on its financial obligations. Given the large investment King County has in the property expressly for habitat creation and the status as a self - insured public agency, we ask that the City waive the requirement for posting of a Bond for the project. Timing Project construction is scheduled to begin during the fall of 2004 and will be completed in late summer 2005 or 2006. The project will be constructed in distinct phases. The first phase will be completed in the fall of 2004 and involve the removal of soil tainted with hydrocarbons. No instream work would be completed during this first phase. The second phase will involve extensive site excavation, final grading, revegetation, and connection of the newly created marsh habitat to the river. This final work will be completed during a low tide cycle sometime during the Washington Department of Fish and Wildlife- approved construction "fish" window of 2005. Given that site grading must occur over an extended period of time, we ask that the City allow the planting to be completed after Phase 2 is complete. Laurie Werle October 1, 2004 Page 5 We ask that the Director consider these requests, keeping in mind that they are being made in an attempt to improve habitat in and along the Duwamish River. Thank you for your prompt consideration of this request. If you have any questions concerning this project, please contact me at 206 - 296 -1966. Sincerely, Hansen, Senior Ecologist ological Services Unit JH:bgD78 Enclosures cc: Don Althauser, Supervising Engineer, Surface Water Engineering Services Unit, Water and Land Resources Division (WLRD) Mark Wilgus, Senior Engineer, Surface Water Engineering Services Unit, WLRD FOR STAFF USE ONLY Sierra Type: P-SP Planner: File Number: Application Complete (Date: ) Project File Number: Application Incomplete (Date: ) Other File Numbers: APPLICATION NAME OF PROJECT/DEVELOPMENT: No o r+k W lAA IRe s+c a4 io CITY OF TUKWILA Department of Community Development 6300 Southcenter Boulevard, Tukwila, WA 98188 Telephone: (206) 431 -3670 FAX (206) 431 -3665 E -mail: tukplan(aci.tukwila.waus LOCATION OF PROJECT/DEVELOPMENT: Give street address or, if vacant, indicate lot(s), block and subdivision, access street, and nearest intersection. LIST ALL TAX LOT NUMBERS. 272 { i 11- 9 -reed Teex l.6-1- k`s B u 23 b4 1tt -oe Quarter:S E Section: D N Township:23 Range: D (This information may be found on your tax statement.) w TUKWILA p l W � � SPECIAL PERMISSION DIRECTOR Wei Tvvk'f da 1 a nti 0N 23DN- 8118 -0 q DEVELOPMENT COORDINATOR : The individual who: • has decision making authority on behalf of the applicant in meetings with City staff, • has full responsibility for identifying and satisfying all relevant and sometimes overlapping development standards, and • is the primary contact with the City, to whom all notices and reports will be sent. Name: Address: Phone: E -mail: Signature: (J k6 Pi tot 1 5b, 4'L - 43 - 44 50 , 4 S1 eeJ 2b(v 2 ig66 ova 1�1��— Date: FAX: ?.b b ? —803 Check items submitted with application Information Required May be waived in unusual" cases, upon approval of both Public Works and Planning APPLICATION MATERIALS: X 1. Application Checklist one (1) copy, indicating items submitted with application. X 2. Permit Fee (LDR = $200, Other zones = $300). X 3. Written description of the project, the deviation being requested and response to the applicable decision criteria. ZONING CODE PARKING DEVIATION 4. A complete description of the proposed construction relative to parking areas, and all supporting agreements. 5. Dimensional site plan(s) to demonstrate parking area consistent with Zoning Code requirements. 6. Parking studies as needed to demonstrate adequate parking is provided. LANDSCAPE DEVIATION 7. Landscape plan — two (2) copies showing size and species of existing and proposed plant materials, required perimeter landscape types, parking areas, buildings, walkways, transit facilities, property lines, dimensions and area of planting beds and any calculations necessary to demonstrate compliance with review criteria. TREE REGULATION DEVIATION X to 8. Tree survey showing size and species of existing trees, with trees to be removed and trees be retained noted (unless request is for use of canopy cover method) X 9. Tree replacement calculations per TMC 18.54.130.3 B or canopy cover calc ulations per TMC 18.54.140 B. 10. Description of the nature of the undue hardship caused by strict compliance with the Tree Regulations, proposed mitigation measures and justification for the deviation from Tree Regulations. COMPLETE APPLICATION CHECKLIST The materials listed below must be submitted with your application unless specifically waived in writing by the Public Works Department and the Department of Community Development. Please contact the Department if you feel that certain items are not applicable to your project and should be waived, or should be submitted in a later timely manner for use at the Public Hearing (e.g., revised colored renderings). Application review will not begin until it is determined to be complete. ADDITIONAL MATERIALS MAY BE REQUIRED. The initial application materials allow starting project review and vesting the applicant's rights. However, they in no way limit the City's ability to require additional information as needed to establish consistency with development standards. Department staff are available to answer questions about application materials at 206 -431 -3670. COMPLETE APPLICATION CHECKLIST TABLE Check items submitted with application Information Required. May be waived in unusual cases, upon approval of both Public Works and Planning SENSITIVE AREA ORDINANCE DEVIATIONS 11. Site Plan — two (2) copies showing all buildings, parking areas, walkways, property lines, planting areas, sensitive areas, their buffers and setbacks. 12. Sensitive area studies and enhancement plans to justify a requested buffer or setback reduction and demonstrate that the reduction will not result in a direct or indirect short-term or long -term adverse impact to the sensitive area. SIGN CODE APPROVAL/DEVIATION 13. Complete "Permanent Sign Permit Application" with all supporting materials and fees ($50). 14. The following information should be given on the plans: North arrow, title, scale and date; Vicinity map showing location and names of adjacent roads; Property lines; Locations of all buildings on site; Dimensioned elevations of building drawn to scale (for wall signs); Elevations, dimensions and materials of proposed sign(s) including advertising copy; Color elevation of proposed sign. CARGO CONTAINER APPROVAL 15. Site plan showing the location of the container(s) in relationship to parking areas, property lines, buildings, streets, trails, landscape areas and setbacks. 16. Description of the proposed screening. 17. Dimensions of proposed cargo container. King County Water and Land Resources Division Department of Natural Resources and Parks King Street Center 201 South Jackson Street, Suite 600 Seattle, WA 98104 -3855 206 - 296 -6519 206 - 296 -0192 Fax May 24, 2004 Nora Gierloff, Planning Manager Department of Community Development City of Tukwila 6300 Southcenter Boulevard, Suite 100 Tukwila, WA 98188 ReceivE 1 M Ay '' 6 200 T RE: North Wind's Weir Intertidal Restoration Project Dear Ms. Gierloff: Enclosed for your review and comment are the State Environmental Policy Act Checklist and Determination of Non - Significance for the above - referenced project. The purpose of the North Wind's Weir Intertidal Restoration Project is to restore important intertidal habitat within the lower Duwamish River, with the intent of specifically providing mudflat and saltmarsh habitats suitable for rearing and foraging by juvenile salmonids. This will be accomplished by removing fill material and regrading the site to intertidal elevations, reconnecting the site to the river, restoring the natural shoreline, and planting native intertidal and riparian vegetation. The project will involve the excavation and removal of approximately 65,000 cubic yards of fill and native soil material from the site. The majority of the site will be lowered to elevations ranging from -1 to +4 feet NGVD 88 ( +1.35 to 6.35 MLLW) and will be connected to the Duwamish River via an entrance off the east side of the rock weir and its associated scour pool. The project area is located along the eastern bank of the lower Duwamish River at approximately river mile 6.2, in the southeast quarter of Section 4, Township 23 North, Range 4 East, Willamette Meridian, within the City of Tukwila, Washington. The project area encompasses approximately 3.27 acres, bordered on the west by the Duwamish River and a fringe of intertidal habitats, to the north by Seattle City Light property, to the east by an existing industrial facility (Pacific Strapping Inc.), and to the south by South 112th Street (Thomas Brothers Map page 625, D -6). The enclosed documents are available for review and comment until June 10, 2004. All comments must be received (or postmarked) by that date. Any appeal to this project must be filed with King County Superior Court by July 1, 2004. Nora Gierloff May 24, 2004 Page 2 Please review these documents, and direct any questions or comments that you may have to Project Manager Jon Hansen at 206 - 296 -1966, or write to: Thank you for your assistance. Wm. Laird O'Rollins Ecologist, Ecological Services Unit WL Enclosures Jon Hansen, Project Manager Ecological Services Unit King County Water and Land Resources Division 201 South Jackson Street, Suite 600 Seattle, WA 98104 -3855 cc: Diane Concannon, Manager, Ecological Services Unit, Water and Land Resources Division (WLRD) Jon Hansen, Project Manager, Ecological Services Unit, WLRD King County ENVIRONMENTAL CHECKLIST North Wind's Weir Intertidal Restoration Project Purpose of the Checklist: The State Environmental Policy Act (SEPA), Chapter 43.21 RCW, requires all governmental agencies to consider the environmental impacts of a proposal before making decisions. An environ- mental impact statement (EIS) must be prepared for all proposals with probable significant adverse impacts on the quality of the environment. The purpose of this checklist is to provide information to help you and the agency identify impacts from your proposal (and to reduce or avoid impacts from the proposal, if it can be done) and to help the agency decide whether an EIS is required. Instructions for Applicants: This environmental checklist asks you to describe some basic information about your proposal. Governmental agencies use this checklist to determine whether the environmental impacts of your proposal are significant, requiring preparation of an EIS. Answer the questions briefly, with the most precise information known, or give the best description you can. You must answer each question accurately and carefully, to the best of your knowledge. In most cases, you should be able to answer questions from your own observations or project plans without the need to hire experts. If you really do not know the answer, or if a question does not apply to your proposal, write "do not know" or "does not apply." Complete answers to the questions now may avoid unnecessary delays later. Some questions ask about governmental regulations, such as zoning, shoreline, and landmark designations. Answer these questions if you can. If you have problems, the governmental agencies can assist you. The checklist questions apply to all parts of your proposal, even if you plan to do them over a period of time or on different parcels of land. Attach any additional information that will help describe your proposal or its environmental effects. The agency to which you submit this checklist may ask you to explain your answers or provide additional information reasonably related to determining if there may be a significant adverse impact. Use of Checklist for Nonproject Proposals: Complete this checklist for nonproject proposals, even though questions may be answered "does not apply." In addition, complete the SUPPLEMENTAL SHEET FOR NONPROJECT ACTIONS (PART D). For nonproject actions, the references in the checklist to the words "project," "applicant," and "property or site" should be read as "proposal," "proposer," and "affected geographic area," respectively. A. BACKGROUND North Wind' sir Intertidal Restoration Project Envir ental Checklist 1. Name of the proposed project, if applicable: North Wind's Weir Intertidal Restoration Project 2. Name of Applicant: King County Department of Natural Resources and Parks Water and Land Resources Division 3. Address and phone number of applicant and contact person: King County Water and Land Resources Division 201 South Jackson Street, Suite 600 Seattle, WA 98104 -3855 Contact: Jon Hansen, Senior Ecologist Phone: 206 - 296 -1966 Fax: 206 - 296 -0192 4. Date checklist prepared: May 2004 5. Agency requesting checklist: King County Department of Natural Resources and Parks Water and Land Resources Division 6. Proposed timing or schedule (include phasing, if applicable): Project construction is scheduled to begin during the summer of 2004 and will be completed in late summer 2005 or 2006. The project will be constructed in three distinct phases. The first phase will be completed in the summer of 2004 and involve the removal of soil tainted with hydrocarbons. The second phase will involve extensive site excavation to remove nearly 65,000 cubic yards of soil material. The third phase will focus on final grading, revegetation, and connection of the newly created marsh habitat to the river. This third phase will be completed during a low tide cycle sometime during the Washington Department of Fish and Wildlife - approved construction window of 2005 or 2006. 7. Do you have any plans for future additions, expansion, or further activity related to or connected with this proposal? If yes, explain. The current proposal is a component of the Green/Duwamish Ecosystem Restoration Program. While there will be numerous other projects constructed under this program, they are all functionally independent from this proposal.. 8. List any environmental information you know about that has been prepared, or will be prepared, directly related to this proposal. • Draft Environmental Assessment prepared by the U.S. Army Corps of Engineers. D/04- 2:M122 1 s /18/04 North Wind's V - Intertidal Restoration Project Environ Ital Checklist • Final Programmatic Environmental Impact Statement and Restoration Plan for the Green/Duwamish River Basin Ecosystem Restoration Program, prepared by the Seattle District Corps and King County Department of Natural Resources and Parks in December 2003. • Green/Duwamish Ecosystem Restoration Study, Final Feasibility Report, prepared by the Seattle District Corps, October 2000. • Programmatic Biological Assessments for the Green/Duwamish Ecosystem Restoration Program, King County, Washington. Separate documents were prepared for species under National Marine Fisheries (NMFS) and U.S. Fish and Wildlife (USFWS) jurisdictions for the Seattle District Corps by Jones & Stokes, June 2000. • Seattle's Urban Blueprint for Habitat Protection and Restoration: Review Draft, prepared by the City of Seattle's Salmon Team, June 2001. 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. No other applications are pending approval for any proposals affecting this proposal. 10. List any government approvals or permits that will be needed for your proposal, if known. • National Environmental Policy Act; • Endangered Species Act (Section 7) Concurrence, USFWS and NMFS; ■ Clean Water Act Section 404 Authorization, U.S. Army Corps of Engineers; • Clean Water Act Section 401 Permit, Washington State Department of Ecology; • Coastal Zone Management Act Consistency, Washington State Department of Ecology; ■ Aquatic Resources Easement, Washington State Department of Natural Resources; • Hydraulic Project Approval, Washington Department of Fish and Wildlife (WDFW); • Type C Construction and Type E Potential Disturbance Permits, Tree Clearing Permit, and Shoreline Management Permit, 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. (Lead agencies may modify this form to include additional specific information on the project description.) The purpose of the North Wind's Weir Intertidal Restoration Project is to restore important intertidal habitat within the lower Duwamish River, with the intent of specifically providing mudflat and saltmarsh habitats suitable for rearing and foraging by juvenile salmonids. This will be accomplished by removing fill material and regrading the site to intertidal elevations, reconnecting the site to the river, restoring the natural shoreline, and planting native intertidal and riparian vegetation. As a result of this project, the native habitats and natural processes conducive to the survival of juvenile salmonids would be restored at this site. The resulting intertidal mudflat, saltmarsh, and riparian habitats would provide D/04- 2:M122 2 5/18/04 D/04- 2:M122 North Wind,[eir Intertidal Restoration Project EnvirLiental Checklist critically important transitional habitat where juvenile salmonids would have the opportunity to feed, rest, and undergo smoltification prior to out - migrating through Puget Sound to the Pacific Ocean. These habitats would also provide important refuge, foraging, and perhaps breeding habitat for a variety of other urban- adapted native fish and wildlife species. The project will involve the excavation and removal of approximately 65,000 cubic yards of fill and native soil material from the site. The majority of the site will be lowered to elevations ranging from -1 to +4 feet NGVD 88 ( +1.35 to 6.35 MLLW) and will be connected to the Duwamish River via an entrance off the east side of the rock weir and its associated scour pool (see attached plan sheet). This will create approximately 1.66 acres of tidal channel and associated intertidal mudflat (below elevation +4 NGVD 88) and approximately 0.76 acre of intertidal and high marsh between elevations +4 and +10 feet NGVD 88 ( +6.35 and +12.35 MLLW). A scrub -shrub community between elevations +10 and +12 feet NGVD 88 ( +12.35 and +14.35 MLLW) of approximately 0.17 acre will gradually transition to a forested riparian buffer encompassing approximately 0.29 acre to the top of the area of excavation. The existing shoreline along the project site will be heavily modified by site excavation and removal of the majority of the shoreline protection (that is, existing riprap and concrete rubble). The upstream side of the entrance channel will be armored and its bank stabilized to better maintain the existing hydrodynamics of the shoreline, better preserve the undisturbed portion of the existing saltmarsh, and support a self - maintaining channel opening. The top and backside of the armoring will be capped with soil and planted with vegetation (likely willows) to increase habitat function and improve aesthetics. On in- coming tides, the site will fill with water through the tidal channel, flooding the mudflat and marsh areas. On very high tides, incoming water will also likely overtop the existing marsh of the site and flood into the site through the restored marsh along the northern edge of the site. On outgoing tides, water will flow off of the restored marsh and mudflat and exit the site through the tidal channel. The slopes and elevations are designed for the mudflats and marsh to drain completely at low tides; the tidal channel may retain some ponded water during some of the higher low tides of the year. This proposal will require grading of the western side of the existing intertidal marsh to • match graded contours with existing contours. The proposal will thus result in the loss of the 0.06 acre of the western extent of the existing intertidal marsh (approximately one -third of the marsh) and its replacement with approximately 0.76 acre of restored intertidal marsh habitat that will ultimately be of similar functional value to invertebrates, fish, and birds. Native species planted within the restored marsh area will likely include a variety of species selected for the anticipated tidal regime'and salinity conditions of the site, such as Lyngby's sedge (Carex lyngbyei), Pacific silverweed (Potentilla anserine spp. pacifica), hardstem bulrush ( Scirpus acutus), softstem bulrush (Scirpus validus), tufted hairgrass (Deschampsia cespitosa), and Douglas, aster (Aster subspicatus). Other emergent species may also be considered for the site, such as slough sedge ( Carex obnupta), small - fruited bulrush (Scripus microcarpus), and spike rush (Eleocharis spp.) based on the presence of these species in reference patches of intertidal vegetation along the Duwamish River. 3 5/18/04 In order to reduce grazing by geese within the newly planted marsh, a complex of goose excluders will be installed over and around the entire mudflat and marsh areas. Based on designs implemented on other restoration sites along the Duwamish shoreline, the excluders will use open -weave steel mesh fencing to prevent `walk -in' or `float -in' access and overhead cables to prevent `fly -in' access to the marsh. The large mesh of the fencing does not restrict access by juvenile salmonids. It is anticipated that these goose excluders will remain in place for a minimum of three years post - planting to allow the restored marsh time to establish and spread sufficiently to withstand herbivory by foraging geese. In order to minimize the functional and temporal loss of the existing marsh, the portion of the marsh to be graded will be salvaged just prior to grading and replanted within the restoration site at the same elevation. Salvage will be accomplished by cutting the root -mat of the existing marsh into sections, sliding a steel plate under the root -mat, and then lifting out sections of the marsh and its root -mat. The salvaged pieces of marsh will then be transplanted to the appropriate elevation contour in the restored marsh within the same tidal cycle. If possible, the salvaged marsh will be transplanted contiguous with retained areas of the marsh to maximize the likelihood that it would re -root with minimal dieback. The expectation is that much of the relocated marsh would re -root within the restoration area and would thus retain its temporal and functional value to the suite of benthic invertebrates, fish, and wildlife that currently utilize this marsh. 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 plan, 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 area is located along the eastern bank of the lower Duwamish River at approximately river mile 6.2, in the southeast quarter of Section 4, Township 23 North, Range 4 East, Willamette Meridian, within the City of Tukwila, Washington (Sheet 1 of the attached plan set). The project area encompasses approximately 3.27 acres, bordered on the west by the Duwamish River and a fringe of intertidal habitats, to the north by Seattle City Light property, to the east by an existing industrial facility (Pacific Strapping Inc.), and to the south by South 112th Street. The project area is directly across the river from an intertidal habitat restoration project (the Cecil B. Moses Park) recently completed in early 2003 by the Elliott Bay Duwamish Restoration Panel that included the King County Department of Natural Resources and Parks and the City of Seattle. North Wind's NI' • Intertidal Restoration Project Environ tal Checklist North Wind': it Intertidal Restoration Project Enviro ental Checklist B. ENVIRONMENTAL ELEMENTS 1. Earth a. General description of the site (underline one): flat, rolling, hilly, steep slopes, mountainous, other. The site is very flat with the exception of the riprap -faced riverbanks, which lie at a slope of approximately 40 percent. b. What is the steepest slope on the site (approximate percent slope)? The steepest slope on the site is approximately 40 percent and is found along the armored banks of the Duwamish River. 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. Due to the degree of dredging, filling, and industrialization of the lower Duwamish River, little is directly known about the native river delta soils. The soils in this area were likely fine materials from alluvium mixed with organic materials from the vast amounts of plant material produced in the estuarine marshes. These soils are generally very deep, poorly drained, and subject to being compacted and destabilized when disturbed. Due to the history of excavation, fill, and varied industrial uses of the project site, the native soil horizon is generally not evident until approximately 14 feet below the existing ground surface. The native soil horizon is generally characterized as a very dark gray to black colored fine sandy loam to silty clay loam overlying an organic rich silty clay loam. From just below the surface to a depth of approximately 14 feet, a mixture of historic fill consisting of sand and other fine- grained soil, steel slag; bricks, and steel debris characterize much of the site. d. Are there surface indications or history of unstable soils in the immediate vicinity? If so, describe. No. However, the banks of the Duwamish River, which are quite steep (see above), have been stabilized with riprap to prevent erosion. e. Describe the purpose, type, and approximate quantities of any filling or grading proposed. Indicate the source of fill. Approximately 65,000 cubic yards of soil and fill will be removed from the site and disposed of in an approved manner. This material is being removed to create intertidal habitat along the river's edge. Approximately 300 cubic yards of riprap /angular rock would be placed along the upstream slope of the entrance channel (see attached drawings) to stabilize the entrance slope and to prevent changes in the existing split in river flow over the rock D/04- 2:M122 5 5/18/04 North Wind's \ Intertidal Restoration Project Envirox\ Checklist weir. It is important to note that the shoreline along the property is already heavily armored and that the project will yield a substantial reduction in bank armoring. f Could erosion occur as a result of clearing, construction, or use? If so, generally describe. The finished project area will be subject to the dynamic forces of both tidal and fluvial flows. While every effort will be made to design and construct the project so that its final contours resemble those of a naturally formed tidal marsh, real tidal and fluvial forces will certainly influence those contours via minor erosion and deposition of sediment. g. D/04- 2:M122 There will be small- scale, temporary increases in turbidity within the river channel as a result of removal of the shoreline riprap, stabilization of the entrance channel, salvaging portions of the native marsh, and connection of the intertidal channel to the river. In order to reduce temporary increases in turbidity and potential effects on aquatic species, all `in- water' construction work will take place during the appropriate fish window (August 1 to August 31, or as otherwise determined by WDFW) and will take place during the lowest portions of the tidal cycle. About what percent of the site will be covered with impervious surfaces after project construction (for example, asphalt or buildings)? Two large concrete building pads will be removed from the site during construction, so the overall impervious surface area of the site will be reduced as a result of the project. A small amount of impervious surface will be added to construct an interpretive trail that will run along the east and north sides of the site. The trail's surface will be crushed gravel and will comprise less than 1 percent of the final project site's area. h. Proposed measures to reduce or control erosion, or other impacts to the earth, if any: The majority of the work proposed will be completed while the project site is isolated from the river. This will be accomplished by excavating the site from east to west, allowing the existing soil to act as a wall or "berm" between the construction work and the river. Erosion that occurs during this portion of the project will be self- contained and not cause off -site turbidity. By installing an effective rock construction entrance, and providing for street sweeping as necessary, the project will reduce the potential for sediment to be tracked onto local streets and ultimately reach the river via the stormwater drainage system. To further reduce the potential for erosion and turbidity, the connection to the river will be made during the appropriate fish window (August 1 to August 31, or as otherwise determined by WDFW) and will take place during the lowest portions of the tidal cycle. Regardless of the techniques employed, there will be some release of sediment as a result of the project. Because such increases will occur only during the portions of the construction sequence that require `in water' work, turbidity impacts will be localized and temporary, and are expected to return to normal levels as soon as `in- water' 6 5/18104 2. Air 3. Water D/04- 2:M122 North Wind' - eir Intertidal Restoration Project Envir ental Checklist construction activities are completed. Turbidity monitoring during construction will ensure that these temporary increases are in compliance with State Water Quality Standards. An erosion and sediment control plan has been developed (Sheet 4 of the attached plan set) to minimize erosion and sediment transport during project construction. Specific measures to be employed will include traditional approaches such as silt fencing, construction entrances, and temporary coverage of exposed soils, but will also cover specialized construction techniques and sequencing. The plan is intended to evolve as construction progresses and will be modified as needed to adjust to changing site conditions. a. What types of emissions to the air would result from the proposal (for example, dust, automobile, odors, industrial wood smoke) during construction and when the project is completed? If any, generally describe and give approximate quantities, if known. Operation of heavy equipment, trucks, and similar equipment is expected to generate a limited amount of exhaust during construction. The completed project, however, will not affect current emission levels. b. Are there any off-site sources of emissions or odor that may affect your proposal? If so, generally describe. No. c. Proposed measures to reduce or control emissions or other impacts to the air, if any: Construction will be performed in accordance with the regulations of the Puget Sound Clean Air Agency. 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 the type and provide names. If appropriate, state what stream or river it flows into. Yes. The project site is on the west bank of the Duwamish River at approximately river mile 6.2. The Duwamish River flows into Puget Sound at Elliott Bay. The project site also encompasses a small intertidal marsh. 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. Virtually all of the project work will be either in or adjacent to the Duwamish River and the small intertidal marsh on its west bank at river mile 6.2. 7 5/18/04 North Wind's - Intertidal Restoration Project Environ• Atal Checklist D104- 2:M122 The purpose of the North Wind's Weir Intertidal Restoration Project is to restore important intertidal habitat within the lower Duwamish River, with the intent of specifically providing mudflat and saltmarsh habitats suitable for rearing and foraging by juvenile salmonids. This will be accomplished by removing the fill and regrading the site to intertidal elevations, reconnecting the site to the river, restoring the natural shoreline, and planting native intertidal and riparian vegetation. This will involve moving approximately 65,000 cubic yards of material and lowering the surface elevation of the site by as much as 20 feet in some areas. A detailed grading plan showing proposed excavation limits is attached. 3) Estimate the amount of fill and dredge material that could 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. Approximately 65,000 cubic yards of material (mostly fill with a large constituent of steel slag, bricks, steel debris, and existing bank riprap) will be removed from 2.88 acres on the west bank of the Duwamish in order to enlarge the intertidal marsh. Removal of this fill will lower the elevation of the site, allowing tidal flows from the adjacent Duwamish River to enter and greatly expand the intertidal marsh. In addition, approximately 300 cubic yards of riprap (taken from existing armored banks that will be removed as a part of this project) will be placed on the upstream slope of the entrance channel (Sheet 3 of the attached plan set) to prevent erosion of that bank. 4) Will the proposal require surface water withdrawals or diversions? Give general description, purpose, and approximate quantities, if known. No water will be mechanically withdrawn or diverted, but the project will allow flows from the Duwamish River to enter and inundate approximately 2.88 acres of intertidal marsh and wetland that will be created by the project. 5) Does the proposal lie within a 100 year floodplain? If so, note location on the site plan. Since construction of the Howard Hanson Dam in 1963, floods have been controlled within the river system, not allowing discharges above the regulated high flow of approximately 12,500 cubic feet per second (as measured at the U.S. Geological Survey gauge in Auburn). Thus, there is very little difference between the 2 -, 5 -,10 -, 25 -, and 50 -year events downstream of the dam, all of which range between 11,000 to 12,500 cubic feet per second. Flood events that inundated the adjacent floodplain no longer occur, and large, channel - altering flows have an extremely low probability of occurrence. Under current conditions, the 100 -year floodplain is confined within the river channel in the vicinity of the proposed project. As part of this project, the D/04- 2:MI22 North Wind'Cloveir Intertidal Restoration Project Envircental Checklist existing riverbank along the site will be removed and the 100 -year floodplain expanded onto the site. Although the floodplain will be widened in this location, there will be no change in the base flood elevation, nor will there be any increased risk of flooding to other properties. 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. Construction of the project may cause small- scale, temporary discharges of turbid water and/or sediment to the river channel, but there will be no discharges of waste material into surface waters. b. Ground: 1) Will groundwater be withdrawn, or will water be discharged to groundwater? Give general description, purpose, and approximate quantities, if known. No groundwater will be withdrawn, nor will any water be discharged to groundwater. 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. Not applicable. 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 f low into other waters? If so, describe. This project will not generate any stormwater or surface water runoff and will, in fact, decrease impervious surface areas and associated runoff. An existing stormwater discharge pipe originating on the property to the east currently runs under the site and discharges into the river. This 8 -inch pipe will be relocated to avoid critical elements of the new habitat, but will continue to discharge to the river. An oil/water separator will be added to the system to enhance water quality treatment. 2) Could waste materials enter ground or surface waters? If so, generally describe. This project will generate no waste materials that could enter surface waters, except for minor and short-term discharges of sediment during construction.. 9 5/18/04 4. Plants D/04- 2:M122 North Wind's ' - Intertidal Restoration Project Environ ital Checklist d. Proposed measures to reduce or control surface, ground, and runoff water impacts, if any: An oil/water separator is being added to the stormwater system crossing the property to enhance water quality treatment. It is important to note that this is not required, but is a voluntary action being taken in cooperation with the adjacent property owner to help improve existing conditions. a. Check or underline types of vegetation found on the site: Deciduous trees: alder, maple, aspen, other: black cottonwood, white poplar Evergreen trees: fir, cedar, pine, other Shrubs: blackberry Grass: creeping bentgrass Pasture Crop or grain Wet soil plants: cattail, buttercup, bulrush, skunk cabbage, other: Lyngby's sedge (Carex lvngbvei ), hard -stem bulrush (Scirpus acutus), Pacific silverweed (Potentilla anserine spp. pacifica), brass- buttons (Cotula coronopifolia), western lilaeopsis (Lilaeopsis occidentalis), and fat -hen saltbush (Atriplex patula) ❑ Water plants: water lily, eelgrass, milfoil, other ❑ Other types of vegetation The site is mostly open with a variety of native and non - native grasses present. Several large cottonwood trees are present along the site perimeter and scattered across the property. The site also has a few white poplar trees and a thick coverage-of blackberries along the riverbank and near the abandoned building foundation near the center of the site. b. What kind and amount of vegetation will be removed or altered? Mostly blackberry and grasses will be removed from the site. Several deciduous trees will be uprooted but retained on the site as woody debris to form fish and/or wildlife habitat. Native marsh and wetland vegetation will be salvaged and replanted on the site. c. List threatened or endangered species known to'be on or near the site. No threatened or endangered plant species are known to be on or near the site. d. Proposed landscaping, use of native plants, or other measures to preserve or enhance vegetation on the site, if any: The existing riprapped shoreline armoring and thicket of blackberries will be removed and replaced with intertidal mudflat and saltmarsh fringed by native riparian plantings. Approximately 1.66 acres of the site will become intertidal mudflat, fringed by an approximately 0.76 -acre band of intertidal and high marsh that will gradually transition to a scrub -shrub and forested riparian buffer. While the proposal will result 10 5/18/04 5. Animals D/04- 2:M122 North Windcwreir Intertidal Restoration Project Envir4. ental Checklist in the loss of 0.06 acre of the existing intertidal marsh, the disturbed portions of the marsh will be salvaged and replaced by the restored intertidal marsh habitat. The resulting marsh will be much larger and provide greater function to invertebrates, fish, and birds. There will be an increase in the extent and species diversity of riparian and upland vegetation on the restoration site. While most of the existing trees on the site will be removed (and retained as large woody debris), approximately 0.47 acre of scrub -shrub and forested riparian buffer will be created around the outer edge of the site. a. Check or underline any birds or animals that have been observed on or near the site, or are known to be on or near the site: ® Birds: hawk, heron, eagle, songbirds, other ® Mammals: deer, bear, elk, beaver, other: river otters, mice and voles, raccoons, opossums ® Fish: bass, salmon, trout, herring, shellfish, other Birds The shorelines and waters of Elliott Bay provide habitat to a number of terrestrial and water - dependent birds. These species include loons, grebes, cormorants, scaups, mergansers, coots, and gulls. The horned grebe and red - necked grebe (State Monitor species), as well as the western grebe, Brandt's cormorant, merlin, and common murre (State Candidate species) and the common loon (State Sensitive species) may also forage over or use surface waters of Elliott Bay. Similarly, abundant waterfowl species also use the waters of the lower Duwamish River. Common species include greater scaups, ring- necked ducks, scoters, American wigeons, Canada geese, mallards, common goldeneye, mergansers, and bufflehead. Other common species include western grebes, double - crested cormorants, American coots, pigeon guillemots, and several gull species, Shorebirds observed in the vicinity of the Duwamish waterway have included sandpipers, dnnlins, and snipe. These waders are generally present in the tidal mudflats and marshes or along sandy shorelines. Several other bird species expected to inhabit the affected area are either Federal Species of Concern or are listed by Washington State as Monitor, Candidate, or Sensitive species. The peregrine falcon (Federal Species of Concern and State Sensitive), osprey (State Monitor), great blue heron (State Monitor), and purple martin (State Candidate) all occur fairly frequently within the area and have been observed using habitats within and along the lower Duwamish River. Osprey are frequently seen foraging for fish over Elliott Bay and the lower Duwamish River and appear to be fairly tolerant of human disturbance when choosing nesting locations. Since 1999, osprey nests have been documented on utility poles or other man-made structures in at least three locations within five miles of the project site: on 11 S /18/04 D/04- 2:M122 North Wind's ; Intertidal Restoration Project Environ,ital Checklist the east side of the Turning Basin, at Terminal 105 (Crowley Marine facility), and at Terminal 18 on Harbor Island (Priority Habitat and Species database search June 5, 2003). A pair of osprey fledged two chicks in 2003 from a nest atop a constructed nesting platform approximately 1.5 miles downstream of the project site at the Hamm Creek restoration site. Similarly, great blue herons are also frequently seen wading within the lower Duwamish River and its remaining intertidal habitats. Three heron rookeries have been documented within the vicinity of the proposed project: approximately five miles downstream of the site on the forested slope west of Terminal 105 (nests unoccupied in 2000), the Black River rookery approximately three miles southeast has been active since 1985, and the Seahurst park rookery has been active since 1981 approximately 2.5 miles southwest of the site (Priority Habitat and Species database search June 5, 2003). In recent years, private individuals have erected nest boxes around Puget Sound and the lower Duwamish River and, these boxes have successfully attracted nesting purple martins. As of June 2003, ten pairs were nesting in Jack Block Park on the west side of Harbor Island, a pair was nesting at Kellogg Island, and one to two pairs were nesting at Terminal 105. There are currently no nest boxes erected farther upstream (that is, toward the project site) than the Terminal 105 site (Kevin Lee, personal communication, June 9, 2003). Terrestrial Mammals, Amphibians, and Reptiles Due to its highly developed and disturbed character, only a few disturbance- tolerant amphibians, reptiles, or terrestrial mammals would be expected to occur within or around the proposed restoration site. Adult tree frogs and garter snakes may occur within the powerline corridor to the north of the site. Raccoons, opossums, rats, mice, and voles may inhabit the remnant patches of riparian trees and blackberries that fringe the lower river and the southern edge of the site. Fish Multiple migratory runs of both native and hatchery reared salmonid stocks occur seasonally in Elliott Bay and the Duwamish River (Warner and Fritz 1995). The use of the Duwamish River by salmonids is believed to be predominantly as a migration corridor. However; some rearing and foraging by juvenile salmonids is likely, particularly in the limited shoreline areas with some structural diversity. Returning adult salmon congregate at the mouth of the Duwamish River prior to upstream migration, and juvenile salmonids may use the nearshore reaches of Elliott Bay to transition into marine waters. There are nine species of anadromous salmonids that have been documented in the Green/Duwamish River: summer /fall chinook salmon, fall run coho salmon, fall run chum salmon, cutthroat, sockeye, and summer /winter steelhead trout, and native char (recently broken into two species —Dolly Varden (Salvelinus malma) and bull trout (Salvelinus confluentus). Pink salmon are also present in the system, but generally not in large numbers, perhaps due to the dramatic loss of estuarine and intertidal habitats 12 5/18/04 D/04- 2:MI22 North Wind'L„Jeir Intertidal Restoration Project Envir } ental Checklist in the lower Duwamish River. Chinook and chum utilize Elliott Bay and the Duwamish estuary more extensively than other anadromous species (Weitkamp and Schadt 1982; Meyer et al. 1981), especially when congregating at the mouth of the Duwamish River during their adult return. The principal juvenile salmonid out - migration season occurs from mid -April through mid -June for steelhead, coastal cutthroat, coho, and chinook; chum salmon generally out - migrate slightly earlier, between mid -March and early May (Grette and Salo 1986, U.S. Army Corps of Engineers 1998). b. List any threatened or endangered species known to be on or near the site. Bald eagle and chinook salmon are both known to occur near the site. Chinook salmon migrate both upstream and downstream past the project site, and the lower Duwamish is known to be an important rearing area for juvenile and smolting chinook. c. Is the site part of a migration route? If so, explain. Yes. Nine species of anadromous salmonids are known to migrate upstream and downstream in the Duwamish past the project site. Although both winter and summer steelhead use this system, most adult salmon migrate upstream during the summer and fall. The principal juvenile salmonid out - migration season occurs from mid -April through mid -June for steelhead, coastal cutthroat, coho, and chinook; chum salmon generally out - migrate slightly earlier, between mid- March and early May. d. Proposed measures to preserve or enhance wildlife, if any: As the result of this project, the native habitats and natural processes conducive to the survival of juvenile salmonids would be restored at this site. The resulting intertidal mudflat, saltmarsh, and riparian habitats would provide critically important transitional habitat where juvenile salmonids would have the opportunity to feed, rest, and undergo smoltification prior to out - migrating through Puget Sound to the Pacific Ocean. These habitats would also provide important refuge, foraging, and perhaps breeding habitat for a variety of other urban- adapted native fish and wildlife species. 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. 13 5/18/04 D/04- 2:M122 North Wind's Ur Intertidal Restoration Project Environ tal Checklist 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: Not applicable. 7. Environmental Health a. Are there any environmental health hazards, including exposure to toxic chemicals, risk of fire and explosion, spill, or hazardous waste, that could occur as a result of this proposal? If so, describe. No toxic chemicals or hazardous waste will be used or generated by this project. Elevated levels of hydrocarbons, however, have been detected in the soil. Testing completed to date indicates that these contaminants are located near the surface and can be completely removed during the first phase of construction. King County, in consultation with the Washington State Department of Ecology, is developing a remediation plan for the removal and proper disposal of these materials. 1) Describe special emergency services that might be required. None. - 2) Proposed measures to reduce or control environmental health hazards, if any: Maintenance and refueling of equipment to be used will be done outside of the river, wetland, and their buffers. b. Noise: 1) What types of noise exist in the area that may affect your project (for example, traffic, equipment, operation, other)? Some noise from adjacent industrial areas is expected, but this will have no effect on construction or the completed project. 2) What types and levels of noise would be created by or associated with the project on a short - term or long -term basis (for example, traffic construction, equipment operation, other)? Indicate what hours noise would come from the site. During construction, noise from equipment operation will increase noise levels. Temporary increases in the vicinity of the project could be as high as 90 decibels. The completed project will not change existing noise levels. 3) Proposed measures to reduce or control noise impacts, if any: Construction activities will comply with the provisions of the King County Noise Ordinance (Ordinance No. 3139). Equipment operation will typically be limited to the hours of 7 a.m. to 7 p.m., Monday through Saturday. Work necessary to make the connection to the river, however, will need to be done at the lowest available tide; therefore, it may be completed outside of normal working hours. 14 5/18/04 North Wind'LTeir Intertidal Restoration Project Envir 8. Land and Shoreline Use D/04- 2:M122 ,ental Checklist a. What is the current use of the site and adjacent properties? Existing land use consists of vacant industrial land on historic fill material. All structures have been demolished and the fill material is largely unvegetated, with the exception of scattered black cottonwood (Populus balsamifera) trees and non - native species of blackberry (Rubus spp.). The lower end of the river (downstream of the Turning Basin and the North Wind's Weir restoration site) is the heavily industrialized portion known as the Duwamish Waterway. The shoreline along the Waterway is intensively developed for industrial and commercial operations, and the upland areas are similarly heavily industrialized by a variety of water - dependent industrial users. Beginning just downstream of the project site and continuing to the mouth, over -water structures (such as piers and docks) occupy 12,150 linear feet (2.3 miles) on both banks of the river. This represents about 20 percent of the lower estuarine shoreline (King County Department of Natural Resources 2001). As a major shipping route for containerized and bulk cargo, the navigation channel is subject to intense marine traffic, in addition to recreational boaters and other river users. Upstream of the North Wind's Weir restoration site, the shoreline and uplands are similarly developed with intense industrial, commercial, and residential development. Large land users include The Boeing Company, the King County Regional Airport (Boeing Field), and the Museum of Flight. b. Has the site been used for agriculture? If so, describe. No. c. Describe any structures on the site. All structures have been removed from the site. Two concrete pads remain, but will be removed as a part of this project. d. Will any structures be demolished? If so, what? No. e. What is the current zoning classification of the site? MIC/H (Manufacturing Industrial Center/Heavy Industrial). f What is the current comprehensive plan designation of the site? MIC/H (Manufacturing Industrial Center/Heavy Industrial). If applicable, what is the current shoreline master program designation of the site? Urban. 15 5/18/04 North Wind's - Intertidal Restoration Pr Environ ital Checklist h. Has any part of the site been classified as an "environmentally sensitive" area? If so, specify. Yes. The Green/Duwamish River and its shoreline are classified by the City of Tukwila as an environmentally sensitive area. i. Approximately how many people would reside or work in the completed project? None. • J• Approximately how many people would the completed project displace? None. k Proposed measures to avoid or reduce displacement impacts, if any: Not applicable. 1. Proposed measures to ensure the proposal is compatible with existing and projected land uses and plans, if any: The North Wind's Weir Intertidal Restoration Project is one of a growing number of projects in the lower Duwamish River designed and constructed to enhance and at least partially replace lost biological diversity and capacity. Opportunities for such projects are rare, given the value and use of industrial properties along the waterway, and the importance of restoring habitat for anadromous salmonids has been emphasized by agencies from the local to the federal level. Therefore, the use of publicly owned land that is suitable for such a project is consistent with the goal of increasing the biological capacity of important and impaired systems such as the Duwamish. 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: Not applicable. D/04- 2:M122 16 5/18/04 10. Aesthetics D104- 2:MI22 a. What is the tallest height of any proposed structure(s), not including antennas? What is the principal exterior building material(s) proposed? No structures will be constructed for this project: In fact, the project will entail a decrease in the elevation of the site. b. What views in the immediate vicinity would be altered or obstructed? Construction of the project will change the character of the views from adjacent properties. The completed project will provide a widened river cross section with views of the mudflat, marsh, and riparian vegetation. Adjacent properties and recreational users of the trail across the river will also have the opportunity to observe fish and wildlife using the site. c. Proposed measures to reduce or control aesthetic impacts, if any: Native plantings will enhance the aesthetics of the area. 11. Light and Glare a. What type of light or glare will the proposal produce? During what time of day would it mainly occur? None. b. Could light or glare from the finished project be a safety hazard or interfere with views? No. c. What existing off -site sources of light or glare may affect your proposal? None. d. Describe proposed measures to reduce or control light and glare impacts, if any. None. 12. Recreation North Wind`Teir Intertidal Restoration Project Enviritental Checklist a. What designated and informal recreational opportunities are in the immediate vicinity? The Green/Duwamish River Trail runs along the western side of the Duwamish River, beginning approximately one mile downstream of the proposed restoration site. The trail supports day -use recreation such as jogging and biking by local residents and workers. The 3 -acre Cecil Moses Memorial County Park is located along the trail, directly across the river (to the west) from the proposed restoration site. The park includes an intertidal restoration site as well as landscaping and bathroom facilities. A 17 5/18/04 North Wind's ' `r Intertidal Restoration Project Environ' }tal Checklist footbridge crosses the Duwamish approximately 50 feet upstream of the proposed project site, which will allow trail users to effectively view the site and gain access. The rock weir located just off the westem edge of the property attracts kayakers to the rapids that form as the river cascades over the rocks. Birdwatchers and people interested in watching the kayakers and the rapids can view the river from the footbridge. b. Would the proposed project displace any existing recreational uses? If so, describe. No. The existing trails and other recreational amenities will not be impacted by the project. c. Proposed measures to reduce or control impacts on recreation, including recreation opportunities to be provided by the project or applicant, if any: The proposed project will enhance both the aesthetics of the site and its value to those interested in birdwatching or wildlife viewing. Public access and educational opportunities will also be enhanced via a trail and interpretive signs. 13. Historical and Cultural Preservation 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 properties listed on the National Register of Historic Places or the state listing are located within the proposed project area. The site does lie adjacent to a Native American legendary location referred to as North Wind's Weir. b. Generally describe any landmarks or evidence of historical, archaeological, scientific, or cultural importance known to be on or next to the site. The project area is situated within the usual and accustomed fishing and shellfish harvesting areas of the Muckleshoot Indian Tribe on the Duwamish River. The Tribe historically and presently harvests salmon and shellfish from the lower river. Gill - netting for salmon occurs within the river just downstream of the project site. This location would have been a prime fishing site for Native Americans, and the adjacent shores are considered likely to contain evidence related to this activity. The proposed restoration site is adjacent to a rock protrusion from the bank known as the North Wind's Weir. D/04- 2:MI22 c. Proposed measures to reduce or control impacts, if any: The site is covered with several feet of fill material that was likely imported when the area was being developed for industrial use. During project planning and design, backhoe trenches were excavated to determine if subsurface archaeological deposits were present below the fill (see attached plans). The backhoe testing indicated that the upper levels of native soils within the project area were removed sometime in the past and the area covered with imported fill of varying characteristics. The extreme depth 18 5/18/04 D/04- 2:M122 No. No. North Wind' eir Intertidal Restoration Project Envir , Checklist of the fill greatly reduces the possibility that any of the proposed alternatives could affect buried archaeological deposits. If cultural or archaeological resources are uncovered or encountered during project construction, work will cease immediately, and appropriate steps necessary to protect those resources will be taken prior to resumption of construction. If resources are discovered, the Washington State Office of Archaeology and Historic Preservation, the King County Office of Business Relations and Economic Development, and any affected tribal groups will be notified immediately, and an on -site inspection will be conducted by a state - certified archaeologist and other qualified resource professionals. A mitigation plan will be prepared prior to construction resuming at the site. In addition, discussion of the measures and the possibility of uncovering materials of archaeological or historic significance near inland waters will be discussed during a preconstruction conference with the construction crew /contractor prior to performing the work on -site. 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 is served by a dead - end spur of South 112th Street. b. Is the site currently served by public transit? If not, what is the approximate distance to the nearest transit stop? No. Not applicable. c. How many parking spaces would the completed project have? How many would the project eliminate? None. It is common for recreational users to park along the shoulder and at the end of South 112th Street to access the river for fishing and to launch kayaks. Construction of the proposed project will not eliminate these opportunities. 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). e. Will the project use (or occur in the immediate vicinity o) water, rail, or air transportation? If so, generally describe. 19 5/18/04 f How many vehicular trips per day would be generated by the completed project? If known, indicate when peak volumes would occur. g. 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 North Wind's V Intertidal Restoration Project Enviroii • tai Checklist Proposed measures to reduce or control transportation impacts, if any: None. a. Underline utilities currently available at the site: electricity, natural gas, water, refuse service, telephone, sanitary sewer, septic system, other. None. 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 that 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: t. ('. Title: 5et.r £ [a1 o j: cY Date Submitted: 5/18/0 y D/04- 2:M122 20 5/18/04 SITE PLAN SW 116TH ST SW 128TH ST S 96TH ST. VONflY MAP m 0 TO SEATTLE PR JEC SITE V .4 ) T O 0 x m A G) S BOEING ACCESS RD TO TACOMA 112TH ST SHEET DESCRIPTION 1 VICINITY MAP AND SHEET INDEX 2 LEGEND AND NOTES 3 GRADING PLAN AND NOTES 4 GRADING AND EROSION CONTROL NOTES 5 EROSION AND SEDIMENT CONTROL PLAN 6 CROSS SECTIONS 7 PLANTING PLAN, DETAIL AND NOTES 8 SOIL TEST PIT LOCATIONS PROJECT DESCRIPTION: NORTH WIND'S WEIR INTERTIDAL RESTORATION VICINITY MAP AND INDEX SHEET ADDRESS UNE 1: DUWAMISH INTERTIDAL NEAR 2724 S. 112th ST. CITY, COUNTY, STATE, ZIP CODE TUKWILA, KING. WA, 98168 NOT TO SCALE No. 1 Of 8 Sheets APPUCANT: USACE — Seattle District King County DNRP REFERENCE No.: PL -04 -02 WATERWAY: DUWAMISH RIVER S.T.R.: SE 1/4 S.4, T.23N, R.4E r- Air wr .w .w o 0 o 0 a a O 0 PROJECT DESCRIPTION: NORTH WIND'S WEIR INTERTIDAL_ RESTORATION LEGEND AND NOTES ADDRESS UNE 1: DUWAMISH INTERTIDAL NEAR 2724 S. 112TH ST. CRY COUNTY, STATE, ZIP CODE TU KING, WA. 98168 BOUNDAVSS' NC1► CURFENT SURVEY) BOUNDARY CREFEFENCE, CURFEW SURVEY) CE NTERLlE SMETTNOO PROPERTY LUKE =BIM unMUOarxTe PAYMENT UM amtsrxra+Qaue // EA CURB RISE, CHAN LNC , WOOD. EPUT RU- WE7LAAD OAATRSH/SWMUP) PE ETER RET'ANN 1 WALL. CONTOUR (ITERATIVE) CONTOUR OWE) SMIT'ARY BE * POWER (A133AU 6iom DRAINAGE RIGHT-OF-WAY EXISTN01) 'OVER VALVE TRANS18 90N"OMt13R UIU[Y POLE ANCHOR ROCEC SiCEMd MANHOLE BLOCK COFNER x BcRBE HUB +TAICK NOMJI113004.11FACEI WEE (063DUOIU9O SANITARY seem WHOLE 1 PE 1 DITCH BASIN FF3RAR +CAP PR1R.E DEMON SET NAL +BHNE R RAUVAD E1ESlE ceik NEW LOG w /ROOTWAD NEW ROOTWAD NO SCALE No. 2 Of 8 Sheets NOTES; 1. THE PURPOSE OF THIS SURVEY WAS TO ILLUSTRATE VISIBLE IMPROVEMENTS, SHOWN HEREON. 2. HORIZONTAL CONTROL (BASIS OF BEARING AND COORDINATES) ARE DERIVED FROM A FAST STATIC GPS SURVEY BASED ON THREE(3) WSDOT MONUMENTS. 2614 N= 190033.799, E =1281712.332, ELEV.=23.420, GP17005 -72 • 3294 N =209324.816, E =1268664.417, ELEV. =16.181, GP17009 -239 2626 11= 206301.040, E =1273368.009, ELEV. =17.619. GP17005 -184 ALL VERTICAL CONTROL IS BASE ON NGS SY0264 APSSM FOUND POSmON: N =223028.637, E =269578.098, WITH PUBLISHED ELEVATION OF 16.20 3. VERTICAL DATUM IS NAVD88, BASED ON U.S. DEPARTMENT OF COMMERCE, NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION, NATIONAL OCEAN SERVICE TIDAL BENCH MARK PIDfSY0284 (USGS TIDAL 16), ELEVATION =16.20 4. THIS SURVEY WAS • PERFORMED OCTOBER OF 2002. BOUNDARY NOTES; THE BOUNDARY SHOWN HEREON IS BASED ON THE KING COUNTY ASSESSOR PLAT OF THE AREA, AUGMENTED BY THE WASHINGTON . DEPARTMENT OF TRANSPORTATION DRAWING OF S.R. 99. NO TITLE REPORT WAS FURNISHED TO APS SURVEY&MAPPING, LLC. AND ACTUAL PROPERTY LOCATION MAY VARY. APPLICANT: USACE — Seattle District King County DNRP REFERENCE No.: PL -04 -02 WATERWAY: DUWAMISH RIVER S.T.R.: SE 1/4 S.4, T23N, R.4E • PROJECT DESCRIPTION: NORTH WIND'S WEIR INTERTIDAL RESTORATION GRADING PLAN AND NOTES ADDRESS UNE 1: OUWAMISH INTERTIDAL NEAR 2724 S. 112TH ST. CI1Y. COUNTY, STATE. ZIP CODE TUKWILA, KING. WA. 98168 • 100 200 SCALE: 1 INCH = 100 FEET No. 3 Of 8 Sheets APPUCANT: USACE — Seattle District King County DNRP REFERENCE No.: PL -04 -02 WATERWAY: DUWAMISH RIVER S.T.R.: SE 1/4 S.4. T.23N. R.4E TEMPORARY EROSION AND SEDIMENTAT 0 CONTROL (TESC) NOTES PROJECT DESCRIPTION: NORTH WIND'S WEIR INTERTIDAL RESTORATION GRADING AND EROSION CONTROL NOTES ADDRESS UNE 1: DUWAMISH INTERTIDAL NEAR 2724 S. 112TH ST. CITY, COUNTY, STATE, ZIP CODE TUKWILA, KING, WA, 98186 1. 2. 3. 1. The implementation of these TESC plans and the construction, maintenance. replacement. and upgroding of these TESC facilities is the responsibility of the TESC supervisor until all construction is approved. 2. The boundaries of the clearing limits shown on this plan shall be clearly 4 identified by o continuous length of survey tape (or fencing. if required) prior to construction. During the construction period. no disturbance beyond the clearing limits shall be permitted. The clearing limits sholl be mointoined by the TESC supervisor for the durotion of construction. 3. The TESC facilities shown on this plan must be constructed prior to or in conjunction with all clearing and groding so as to ensure that the transport of sediment to surface waters. drainage systems, and adjacent properties is minimized. 4. The TESC facilities shown on this pion are the minimum requirements for 5. onticipoted site conditions. During the construction period. these TESC focilities sholl be upgraded as needed for unexpected storm events and modified to account for changing site conditions (e.g. additional sump pumps. relocation of ditches and silt fences, etc.) 5. The TESC facilities shall be inspected daily by the TESC supervisor and mointoined to ensure continued proper functioning. Written records sholl be kept of weekly reviews of TESC facilities during wet season (Oct. 1 to 6. March 31) and monthly reviews during the dry season (April 1 to Sept. 30) 6. Any oreos of exposed soils. including roadway embankments, that will not be disturbed for two days during the wet season or seven days during the dry season shall be immediately stabilized with the approved TESC methods (e.g., seeding. mulching, plastic covering, etc.). 7. Any orea needing TESC measures. not requiring immediate attention. shall be addressed within fifteen (15) days. 8. The TESC facilities on inactive sites sholl be inspected and maintained a minimum of once a month or 48 hours following a storm event. 9. The clearing operation sholl not flush sediment -laden water into the downstream system. 10. Stobilized construction entrances and roads sholl be ihstolled at the beginning of construction and mointoined for the duration of the project. Additional measures, such os wash pads may be required to ensure that all paved oreos are kept clean for the duration of the project. 11. Where straw mulch for temporary erosion control is required, it shall be opplied at a minimum thickness. TESC CONSTRUCTION SEQUENCE 1. Pre - construction 2. Flog or fence clearing limits. 3. Post sign with name and phone number of TESC supervisor. 4. Grade and install construction entrance(s). 5. Install perimeter protection (silt fence. brush barrier, etc.). 6. Construct sediment ponds and traps. 7. Grade and stabilize construction roads. 8. Construct surface water controls (interceptor dikes. pipe slope drains. etc.) simultaneously with clearing and grading for project development. 9. Maintain erosion control measures in accordance with King County standards and manufacturers recommendations. 10. Relocate erosion control measurers or install new measures so thot as site conditions change the erosion and sediment control is always in . occordonce with the King County TESC minimum requirements. 11. Cover all areas that will be unworked for more than seven days during the dry season or two days during the wet season with straw, wood fiber mulch, compost. plastic sheeting or equivolent. 12. Stobilize all areas that reach final grade within seven days. 13. Seed or sod any areas to remain unworked for more than 30 days. 14. Upon completion of project, oll disturbed oreos must be stabilized and bumps removed if appropriate. 7. 6. 9. 10. 11. 12. 13. 14. 15. 16. 17. 0 100 200 SCALE: 1 INCH = 100 FEET No. 4 Of 8 Sheets CONSTRUCTION SEQUENCE /NOTES 1MPLEME rHE TESC CONSTRUCTION SEQUEN4 CLEAR AND GRUB EXISTING VEGETATION AND REMOVE EXISTING CONCRETE PADS. EXCAVATE THE INTERIOR OF THE SITE TO DESIGN GRADES LEAVING AN EARTHEN BERM OF EXISTING SOIL AS A BARRIER BETWEEN THE EXCAVATION AND THE DUWAMISH RIVER. THE EARTHEN BERM WILL A HAVE A MINIMUM TOP WIDTH THAT IS THE GREATER OF 15 FT. OR AS DETERMINED BY THE GEOTECHNICAL ENGINEER. SIDE SLOPE OF THE BERM SHALL BE A MINIMUM OF 2H: 1 V OR AS DETERMINED BY THE GEOTECHNICAL ENGINEER. THE TOP ELEVATION OF THE EARTHEN BERM WILL BE A MINIMUM OF 1 FOOT HIGHER THAN THE EXPECTED HIGH TIDE ELEVATION THROUGH THE DURATION OF CONSTRUCTION. WHERE PETROLEUM CONTAMINATED SOILS ARE ENCOUNTERED, OVER EXCAVATE A MINIMUM OF 2 FEET BELOW PETROLEUM TAINTED SOILS AS DIRECTED BY CORPS OR KING COUNTY CONSTRUCTION MANAGER. LIMITS OF CONTAMINATED SOILS WILL BE VERIFIED IN THE FIELD AND /OR WITH LAB TESTING PRIOR TO FINAL GRADING. CONTAMINATED SOILS WILL BE STOCKPILED SEPARATELY AND BE TRANSPORTED TO AN APPROVED DISPOSAL SITE IN ACCORDANCE WITH APPLICABLE FEDERAL AND STATE REGULATIONS. IN AREAS OF OVER EXCAVATION, BACKFILL WITH CLEAN NATIVE MATERIAL APPROVED BY THE CORPS OR KING COUNTY BIOLOGISTS. BACKFILL MATERIAL SHALL BE SUITABLE FOR PLANTING. BUT NEED NOT BE CLASSIFIED AS TOPSOIL. IF SUITABLE NATIVE SOIL IS NOT AVAILABLE, BACKFILL WITH TOPSOIL OR EQUIVALENT MIX AS APPROVED BY KC OR COE BIOLOGIST. IN AREAS SHOWN ON THE PLANTING PLAN FOR VEGETATION. UNSUITABLE EXISTING MATERIAL WILL BE OVEREXCAVATED BELOW DESIGN GRADE TO A DEPTH AS DIRECTED BY CORPS OR KING COUNTY BIOLOGISTS AND BACKFILLED WITH MATERIAL SUITABLE FOR PLANTING. INSTALL LWD PER THE SITE PLAN. HYOROSEED ABOVE MHW. PLACE JUTE /COIR FABRIC ON 3:1 SLOPES BELOW MHW. INSTALL PLANTINGS PER THE PLANTING PLAN. REMOVE THE EARTHEN BERM. MAKING THE CONNECTION BETWEEN THE SITE AND THE DUWAMISH RIVER. THE EXCAVATION OF THE EARTHEN BERM SHALL BE TIMED WITH TIDAL CYCLE TO MINIMIZE EROSION. THIS MAY REQUIRE THE BERM TO BE REMOVED IN STAGES. IF THE ENTIRE BERM CANNOT BE REMOVED WHILE THE TIDE IS OUT. THE.EXPOSED OPENING AND SIDE SLOPES WILL BE COVERED WITH PLASTIC SHEETING AND ANCHORED DOWN WITH SAND BAGS TO PREVENT EROSION WHEN THE TIDE COMES BACK IN. IF THE EXCAVATION OF THE EARTHEN BERM MUST - BE DONE IN STAGES. THEN THE OPENING IN THE EARTHEN BERM MUST BE A MINIMUM OF X FEET WIDE PRIOR TO THE RETURN OF THE HIGHER TIDES (DETERMINED BY HYDRAULICS ENGINEER). OTHERWISE ANOTHER METHOD MUST BE CHOSEN. THIS IS TO PREVENT SIDE CUTTING OF THE SLOPES AND EROSION CAUSED BY HIGHER VELOCITIES OF THE TIDE FLOWING IN AND OUT OF AN OPENING CHANNEL THAT IS TOO SMALL IN SIZE. INSTALL ACCESSNIEWING PATH. INSTALL OSPREY POLE. INSTALL HAND LAUNCHED BOAT RAMP. APPLICANT: mA USACE-SeoWeDistrict King County DNRP REFERENCE No.: PL -04 -02 WATERWAY: DUWAMISH RIVER S.T.R.: SE 1/4 S.4, T.23N, R.4E 4 LEGEND: TEMPORARY SEDIMENT CONTROL SYMBOL NAME • REFERENCE MULCH (D-5) SF SIX FENCE (0-15) CoNSTRUCT1oN ACCESS ROAD s022=z9CE STADIUM) CONST. (0-16) DURANCE - amaxec SP SEDUM* POND (0-23) • REFERDICE PACE ItEFERS 10 EROSION AND SEDIMENT CONTROL STANDARDS APPENDIX 0 OF THE KM COUNT( SURFACE WATER MANUAL 1098. • PROJECT DESCRIPTION: NORTH WIND'S WEIR INTERTIDAL RESTORATION EROSION AND SEDIMENT CONTROL PLAN ADDRESS UNE 1: DUWAMISH INTERTIDAL NEAR 2724 S. 112TH ST. (my. COUMY, STATE, ZIP CODE TUKWILA, KING, WA, 98186 CATCH BASIN INSERTS • 4#, • SelMI6LTSZAIOET4 1. SEDIMENT PONDS WILL BE PLACED ON SE AS NECESSARY TO CAPTURE SEDIMENT AND SETTLE FINES. 2. CLEAN WATER IN THE EXCAVATION, AS DETERMINED BY THE APPROPRIATE STANDARDS, WY BE PUMPED DIRECTLY TO THE DUWAMISH RNER. 3. came DRAINAGE PIPE THROUGH THE PROJECT EXCAVATION MAY BE ENCOUNTERED. THIS PIPE SHOULD BE REMOVED SO THAT IT IS FLUSH Velli 1HE GROUND AT DESIGN GRADE AND A ROCK PAD PROVIDED 10 DISSIPATE ENERGY 70 A POINT OF FLAT GRADIENT (LESS 1HAN 3:1). TEMPORARY PIPING SHOULD DIRECT DU- STORMWATM DIRECTLY TO THE DUWAMISH RNER WHILE THE PROJECT IS UNDER CONSTRUCTION. 100 200 SCALE 1 INCH = 100 FEET No. 5 Of 8 Sheets MORE NOTES SEE SHEET 4 OF 8 APPUCANT: USACE—Seattle District King County DNRP REFERENCE No.: PL-04-02 WATERWAY: DUWAMISH RIVER S.T.R.: SE 1/4 S.4. T.23N. R.4E r PROJECT DESCRIPTION: NORTH WIND'S WEIR INTERTIDAL RESTORATION CROSS SECTIONS ADDRESS UNE 1: DUWAMISH INTERTIDAL NEAR 2724 S. 112TH ST. CITY. COUNTY. STATE. ZIP CODE TUKWILA, KING, WA, 98186 LEVATION VIEW 80 SCALE: 1 INCH a 80 FEET No. 6 Of 8 Sheets 160 APPUCANT: USACE— Seattle District King County DNRP REFERENCE No.: PL -04 -02 WATERWAY: DUWAMISH RIVER S.T.R.: SE 1/4 S.4. T.23N, R.4E NAVO 68 SEATRE AREA TIDE TABLES MHHW 6.97 11.32 MHW 6.12 10.47 MLW .47 2.82 MLLW -2.35 0 � ilkU nm��I��u� IUUM����\\\\1\�� .�: 1s l ' u ' ► tao nv' +�s s en1StcYIK. +eE= _ eteatti�tt� "s_ aSt:ii: MLLW a- -2.35 - 1 4 NOTE: OMER Cents Ceres ettnupla S 10 Cores 1A*gbyM r7,71 Aster Sub.pIcatus • dogwood O.ehampeio co..pita.s Q Scirpus snacks 0 /Mow cuttings e cottonwood 1VDI`!I PI ANTT►TG N EMERGENT AREAS 1-EVERGDIT AREAS NO own= Osoohanceis 15% COW knobysl SOX IAN MT amine. Dogwood Cottonwood Nootko roes sdmonbony b nbeny hawthorn Jonas vo/Mas * Coles b+robyl Poterdlo coerce 8% 6 10 12 ELEV. PROJECT DESCRIPTION: NORTH WIND'S WEIR INTERTIDAL RESTORATION PLANTING PLAN. DETAIL AND NOTES ADDRESS UNE 1: DUWAMISH INTERTIDAL NEAR 2724 S. 112TH ST. CITY, COUNTY. STATE. ZIP CODE TUKWILA, KING. WA. 98186 01651840 GROUND/BEGIN c • e RIPARWI/UPUUW Ndor Cottonwood qty Plum Ash SO Mg Loaf Incion mpg MoMaple i4* 4 Hoz Nootko s *homing hawthorn GENERAL NOTES: 1. ADO 6 INCHES OF TOPSOIL TO AU. PLANTING AREAS. TOPSOIL IS TO BE WORKED/TLLED INTO TOP 12 INCHES OF EXISTING SOIL. 2. MULCH AREAS ABOVE ELEV. 10 W TTH 3 INCHES W000 MULCH. PROJECT GOALS AND OBJECTIVES THE PURPOSE OF THIS PROJECT 18 TO RESTORE IMPORTANT INTERTIDAL HABITAT WITHIN THE LOWER DUWAMISH RIVER. WITH THE INTENT OF SPECIFICALLY PROVIDING MUDFLAT AND SALTMARSH HABITATS SUITABLE FOR REARING AND FORAGING BY JUVENILE SALMONIOS. THIS WILL BE ACCOMPLISHED BY REGRADING THE PROJECT SITE TO INTERTIDAL ELEVATIONS. RECONNECTING THE 61TE TO THE RIVER. RESTORING THE NATURAL SHORELINE. AND PLANTING NATIVE INTERTIDAL AND RIPARIAN VEGETATION. THE RESULTING INTERTIDAL MUDFLAT. SALT MARSH. AND RIPARIAN HABITATS WILL PROVIDE CRITICALLY IMPORTANT TRANSITIONAL HABITAT WHERE JUVENILE BALMONIDB WILL HAVE THE OPPORTUNITY TO FEED, REST, AND UNDERGO SMOLTIFICATION PRIOR TO,OUT- MIGRATING THROUGH PUOET SOUND TO THE PACIFIC OCEAN. THESE HABITATS WILL ALSO PROVIDE IMPORTANT REFUGE. FORAGING. AND PERHAPS BREEDING HABITAT FOR A VARIETY OF OTHER URBAN - ADAPTED NATIVE FISH AND WILDLIFE SPECIES. S TANDARDS OF SUCCESS THE PROJECT WILL BE DEEMED SUCCESSFUL IF THE DESIRED INTERTIDAL HABITATS WITH APPROPRIATE NATIVE PLANT COMMUNITIES ARE CREATED AND THE SITE DOES NOT EXPERIENCE SIGNIFICANT BANK EROSION. IT I8 IMPORTANT TO NOTE THAT RIVERINE SYSTEMS ARE DYNAMIC AND MINOR ADJUSTMENTS IN ELEVATIONS AND PLANT COMMUNITIES ARE EXPECTED TO OCCUR OVER TIME. CONTINGENCY PLAN IF THE PROJECT FAILS TO MEET THE STATED GOALS AND OBJECTIVES. THE DESIGN TEAM WILL EVALUATE THE CONDITIONS AND N CONSULTATION WITH PROJECT SPONSORS. LOCAL JURISDICTIONS AND REGULATORY AGENCIES. WILL PREPARE AND IMPLEMENT A CONTINGENCY PLAN TO AGGRESS THE DEFICIENCIES. AS THIS IS A NON - COMPENSATORY. RESTORATION PROJECT. HOWEVER, THE DECISION TO PURSUE FURTHER ACTION THAT 1S NOT REQUIRED TO PROTECT EXISTING E NVIRONMENTAL CONDITIONS, ADJACENT ROADWAYS. UTILITIES OR PRIVATE PROPERTY WILL BE AT THE DISCRETION OF THE DESIGN TEAM AND THE PROJECT SPONSORS. NOTE: TO CONVERT 10 SEATTLE AREA TIDE TABLES DATUIJ, ADO 2.35 FT. 100 SCALE: 1 INCH = 100 FEET No. 7 Of 8 Sheets 200 PACIFIC STRAPPING CO. O MERIDIA W.S.L.G.N.Z. NAVD88 NOTE IMPACTED MARSH AREA TO BE SALVAGED AND REPLANTED ON —SITE AT SAME ELEVATIONS ( PLAN VIEW JI 1 1 1 1 MPARMWUPLAND PLANTINGS 12 -TOP OF SLOPE TRAIISITION: SCRUB/SHRUBS (ELEV. 10-12) INTERTIDAL EMERGENT COMMUNITY (ELEV. 4 -10) MUORAT AREA: NO PLANTING PROPOSED (ELEV. -1 TO 4) WADIIE NESTNO BOX APPUCANT: USACE — Seattle District King County DNRP REFERENCE No.: PL -04 -02 WATERWAY: DUWAMISH RIVER S.T.R.: SE 1/4 S.4. T.23N. R.4E , .. PLAN VIEW `�- • / / ; /- a .,41 . �.•' f' 1 e ••• ` ��� to —BH -103 . e .03 —BH 104 03 —BH -108 • �. ; • m ) : ; r e MERIDIAN • W.S.L.G.N.Z. I • e ..i . r • MITERfIDAL MARSH LOCATION , a PER FIELD OBSERVATION AND a MEASUREMENT, NOT SURVEYED. • 7 ' ' 03 �\ i " .. • f • s \ T 1 w / w ,. ; 03—EN-1 • 1 / J ' - -" /iii 03 —BH -102 1 - li/ • y� � / 4 . I 03 —BH -105 ? `' 03 —BH -106 • \ 1 /11 -b ., • ) • c., . ),\ le . NAVD88 r • � �� • • • • • i . z _ --1 • LEGEND 03 — - 101 BACKHOE TEST PIT ® YEAR, NUMBER & LOCATION • APPUCANT: USACE— Seattle District King County DNRP REFERENCE 140.: PL -04 -02 WATERWAY: DUWAMISH RIVER S.T.R.: SE 1/4 S.4, T.23N, R.4E PROJECT DESCRIPTION: NORTH WIND'S WEIR INTERTIDAL RESTORATION SOIL TEST PIT LOCATIONS ADDRESS LINE 1: DUWAMISH INTERTIDAL NEAR 2724 S. 112TH ST. CfIY, COUNTY, STATE. ZIP CODE TUKWI A, KING. WA. 98186 0 100 200 . SCALE: 1 INCH = 100 FEET No. 8 Of 8 Sheets State has a 200' shoreline Zone. Within this zone, local government must regulate land uses differently Under King County SSWMP Urban Environment Industrial activity is permitted..but height and parking regulations are different. Setback is 50' from ordinary hwm or 20' from floodway , whichever is greater. Affects actual buildings within the setback of 50' but affects site planning on the whole property. Property 0423049148 is most affected. The one to the South is fully developed and not likely to redevelop in the foreseeable future. The one to the north is owned by Seattle City Light. State has a 200' shoreline Zone. Within this zone, local government must regulate land uses differently Under King County SSWMP Urban Environment Industrial activity is permitted..but height and parking regulations are different. Setback is 50' from ordinary hwm or 20' from floodway , whichever is greater. Affects actual buildings within the setback of 50' but affects site planning on the whole property. Property 0423049148 is most affected. The one to the South is fully developed and not likely to redevelop in the foreseeable future. The one to the north is owned by Seattle City Light. sooloso (vi) Those shorelands associated with (i), (ii), (iv), and (v) of this subsection (2)(e); (f) "Shorelands" or "shoreland areas" means those lands extending landward for two hundred feet in all directions as measured on a horizontal plane from the ordinary high water mark; floodways and contiguous floodplain areas landward two hundred feet from such floodways; and all wetlands and river deltas associated with the streams, lakes, and tidal waters which are subject to the provisions of this chapter; the same to be designated as to location by the department of ecology. (i) Any county or city may determine that portion of a one - hundred - year -flood plain to be included in its master program as long as such portion includes, as a minimum, the floodway and the adjacent land extending landward two hundred feet therefrom. (ii) Any city or county may also include in its master program land necessary for buffers for critical areas, as defined in chapter 36.70A RCW, that occur within shorelines of the state, provided that forest practices regulated under chapter 76.09 RCW, except conversions to nonforest land use, on lands subject to the provisions of this subsection (2)(f)(ii) are not subject to additional regulations under this chapter; (g) "Floodway" means those portions of the area of a river valley lying streamward from the outer limits of a watercourse upon which flood waters are carried during periods of flooding that occur with reasonable regularity, although not necessarily annually, said floodway being identified, under normal condition, by changes in surface soil conditions or changes in types or quality of vegetative ground cover condition. The floodway shall not include those lands that can reasonably be expected to be protected from flood waters by flood control devices maintained by or maintained under license from the federal government, the state, or a political subdivision of the state; (h) "Wetlands" means areas that are inundated or saturated by surface water or ground water at a frequency and duration sufficient to support, and that under normal circumstances do support, a prevalence of vegetation typically adapted for life in saturated soil conditions. Wetlands generally include swamps, marshes, bogs, and similar areas. Wetlands do not include those artificial wetlands intentionally created from nonwetland sites, including, but not limited to, irrigation and drainage ditches, grass -lined swales, canals, detention facilities, wastewater treatment facilities, farm ponds, and landscape amenities, or those wetlands created after July 1, 1990, that were unintentionally created as a result of the construction of a road, street, or highway. Wetlands may include those artificial wetlands intentionally created from nonwetland areas to mitigate the conversion of wetlands ■ North Winds Weir Existing and Proposed Shorelines Zones Legend River Edge River Environment --40 ft. River Environment — Potential Low Impact Zone- -100 ft. Low Impact Zone — Potential High Impact Zone -200 ft. High Impact Zone — Potential Parcel Proposed Grading Contours -1 0 2 4 6 8 12 October 15, 2004 30 0 30 60 90 120150 Feet MIN 1 N The information induded on this map has been compiled by IGng County staff from a variety of sources and is subject to change without notice. King County makes no representations or warranties, express or implied, as to accuracy, completeness, timeliness, or rights to the use of such information. King County shall not be liable for any general, special, Indirect, incidental, or consequential damages induding, but not limited to, lost revenues or lost profits resulting from the use or misuse of the information contained on this map. Any sale of this map or information on this map is prohibited except by written permission of King County. Flo Mow LOawn.lxrovlew.wnwAnas..Wlsr .ols.in King County North Winds Weir Existing and Proposed Shorelines Zones Legend River Edge River Environment-40 ft. f .. � � f River Environment — Potential ry Low Impact Zone- -100 ft. f r ‘ Low Impact Zone -- Potential High Impact Zone -200 ft. f A. � ` 1 High Impact Zone — Potential Parcel Proposed Grading Contours -1 0 2 4 6 8 12 N October 15, 2004 30 0 30 60 90 120150 Feet The information Included on this map has been compiled by IGng County staff from a variety of sources and is subject to change vrithout notice. King County makes no representations or warranties, express or implied, as to accuracy, completeness, timeliness, or rights to the use of such information. King County shall not be liable for any general, special, indirect, incidental, or consequential damages including, but not limited to, lost revenues or lost profits resulting from the use or misuse of the information contained on this map. Any sale of this map or information on this map Is prohibited cp, except by written permission of King County. King County We Now l0 ArM121C►oM_3• `n.0 Mdt r.160t1n,IM.m.oly.P North Winds Weir Existing and Proposed Shorelines Zones SW 116T1-1 ST SW 128T1-I ST 1075011 8/2003 8/2003, 8/2003 8/2003 TO SEATTLE MARK WILGUS S 112TH ST DON ALTNAUSER, TO TACOMA 1A1647 loaves 11/13/03 Pam Bissonnette, Director VICINITY MAP z 0 SHEET DESCRIPTION 1 VICINITY MAP AND SHEET INDEX 2 GRADING PLAN AND NOTES 3 TEMPORARY EROSION AND SEDIMENT CONTROL 4 SECTIONS 5 TREE CLEARING PLAN King County Department of Natural Resources and Parks Water and Land Resources Division Capital Projects and Open Space Acquisitions Section Surface Water - Engineering and Ecological Services. Units Pam Bissonnette, Director Department of Natural Resources and Parks NORTH WILD'S WEIR SOIL REMEDIATION UNDERGROUND UMW LoCwnoNS ARE APPROX.) NOTE: TO CONVERT TO SEATTLE AREA TIDE . TABLES DATUM, ADD 2.35 FT. NAVD 88 SEATTLE AREA TIDE TABLES MHHW 8.97 11.32 MHW 8.12 10.47 MLW .47 2.82 MLLW -2.35 0 1075011 APS -TJS APS - MACC APS — TJS SCALE IN FEET .. 8/2 8 2003 8/2003 8/2003 161.00KED DOUBLE GATE ALTHAUSER, P.E. DE904 D 1QtEk. M.RADEI.A/LESUE WAN 8/2004 FED. AID No PROJECT No SURVEY No. MAINTENANCE DMSIPN No 1A1647 9 King County Department of Natural Resources and Perks Water and Land Resources Division Capital Projects and Open Space Acquisitions Section Surface Water - Engineering and Eeologlcai Services Unita 35 R LOe PON? DUWAMISH RIVER -- a - -- 0 4 mC F oo NAB CONSTRUCTION /REMEDIATION NOTES; 1. ALL REMEDIATION WORK TO BE COMPLETED IN ACCORDANCE WITH THE CLEAN UP ACTION PLAN PREPARED BY CDM. INC., DATED September: 2004. 2. EXCAVATION /GRADE UNES SHOWN ARE APPROXIMATE FINAL GRADES. DEPTHS OF INITIAL EXCAVATION IN SPECIFIC LOCATIONS WILL VARY AS SHOWN ON CROSS - SECTIONS TO REMOVE ALL CONTAMINATED . SOILS. 3. EXCAVATION SHALL NOT INTRUDE ONTO NEIGHBORING PROPERTIES. 4. CONSTRUCTION MACHINERY SHALL KEEP PROPER DISTANCE FROM THE HIGH POWER UNES RUNNING THROUGH THE ADJACENT PROPERTY TO NORTH EAST. APPROPRIATE SAFETY MEASURES SHALL BE TAKEN AT TIMES. 5. EXTRA CARE SHALL BE TAKEN TO PROTECT THE FOLLOWING: THE FOUNDATIONS OF THE POWER POLES ON THE NORTH EAST PROPERTY (SEATTLE: CITY UGHT); THE EXISTING CONCRETE RETAINING WALL ON THE SOUTH EAST PROPERTY; THE EDGE OF THE RIVER BANK; THE EXISTING ROADWAY; AND THE EXISTING DRAINAGE PIPE RUNNING THROUGH THE SITE FROM THE SOUTH EAST PROPERTY. 6. ANY EXCAVATION OCCURRING WITHIN 50' OF THE RIVER TOP OF BANK WILL REQUIRE REFILL TO FINAL GRADE WITH SURABLE SOILS WITHIN 48 HOURS OF COMPLETION OF CONTAMINANT REMOVAL 7. SHORING MAY BE REQUIRED'. TO PROTECT THE RIVER BANK IN LOCATIONS WHERE CONTAMINATED SOILS WERE FOUND ADJACENT TO THE BANK. TREE REMOVAL SHALL BE DIRECTED BY THE KING COUNTY ECOLOGIST. TRUCK TRAFFIC SHALL FOLLOW THE ROUTE(S) SHOWN ON THE APPROVED HAUL ROUTE PLAN. LOCATIONS ARE APPROX.) 2004-66 r fit± LONG 1DAPORARY OONSINUCTION A ROADS, PER KCSWDM\nGURE D.4.G. FED BOOK: SURVEYED: SURVEY BASE NAP: CHECKED: 1075011 APS —TJS APS —MAGG APS TJS 8/2003 8/2003 8/2003 8/2003 INTERTIDAL MARSH LOCATION PER FIELD OBSERVATION MD . MEASUREMENT, NOT SURVEYED. ER tJR ll D BY DATE APPROVED: DON ALTHAUSER, P.E PROJECT mANAaa JON HANSEN 8/2004 8 /2004 DEEneteo. MARK WILGUS DESIGN D11EJtED: - M-RADELLA/LESt1E RAGAN 8/2004 8/2004 10' MIN. FROM PROPERTY UNE/WALL TEMPORARY BERM TO DIRECT WATER AWAY FROM PROPERTY LEGEND: TEMPORARY SEDIMENT CONTROL SYMBOL NAME * REFERENCE —X —X( PROX. CB LOCATION. I.E. .- 10.5' LOCATON & DEPTH OF EX. OUTLET PIPE TO BE FIELD VERIFIED. SF SILT FENCE (D -15) OR STRAW WADDLES ® CE STS E CONST. (0-1B) NEW OR EXISTING CONSTRUCTION FENCE SPFI:W TESC NOTES. 1. SEDIMENT PONDS WILL BE PLACED ON SITE AS NECESSARY TO CAPTURE SEDIMENT AND SETTLE FINES. 2. IT IS ASSUMED THAT DRAINAGE .T0 DEPRESSION WILL PERCOLATE INTO THE SOIL HOWEVER, IF POND FILLS, CLEAN WATER IN THE EXCAVATION, AS DETERMINED BY THE APPROPRIATE STANDARDS, MAY BE PUMPED DIRECTLY TO THE DUWAMISH RIVER. 3. EXISTING DRAINAGE PIPE. THROUGH THE PROJECT EXCAVATION MAY BE ENCOUNTERED. THIS PIPE SHOULD BE AVOIDED IF POSSIBLE. IF DAMAGED, PIPE SHOULD. BE REPAIRED TO ALLOW DRAINAGE FROM PROPERTY TO EAST TO CONTINUE THROUGH TO THE RIVER. TEMPORARY PIPING SHOULD DIRECT THIS STORMWATER DIRECTLY TO THE DUWAMISH RNER WHILE tnt rnwcui is unut.1 wnslKUGltvn g, 4. DIGGING NEAR TOP OF RIVER BANK TO BE DONE AT LOW TIDE AND BACKFILLED TO PREVENT SLOUGHING AS SOON AS PRACTICAL 10. 40 0 40 80 1201 SCALE IN FEET oars 11 /25/os King County Department of Natural Resources and Parka Water end Lend Resources Division Capital Pmjeds and Open Space Acquisitions Section Surface Wabr - Engineering and Ecologies! Services Units Pam Bisson nelte, Director TEMPORARY EROSION AND SEDIMENTATION CONTROL (TESL) NOTE 1. The implementotion of these TESC pions and the construction, mainten replacement, and upgrading of these TESC facilities is the responsibility of the TESC supervisor until all construction is approved. 2. The boundaries of the clearing limits shown on this plan shall be clea identified by o continuous length of survey tape (or fencing, if requir prior to construction. During the construction period, no disturbance beyond the clearing limits shall be permitted. The clearing limits shall maintained by the TESC supervisor for the duration of . construction. 3. The TESC focilities shown on this plan must be constructed prior to or conjunction with all clearing and grading so as to ensure that the transport of sediment to surface waters, drainage systems, and adjacent properties is minimized. 4. The TESC facilities shown on this plan are the minimum requirements anticipated site conditions. During the . construction period, these TESC facilities shall be upgraded as needed for unexpected storm events . an modified to account for changing site conditions (e.g. additional sump pumps, . relocation of ditches and silt fences, etc.) 5. The TESC facilities shall be inspected daily by the TESC supervisor and maintained to ensure continued proper functioning. Written records sh be kept of weekly reviews of TESC facilities during wet season (Oct. 1 March 31) and monthly reviews during the dry season (April 1 to Sept. 6. Any areas of exposed soils, including roadway embankments, that will n be disturbed for two days during the wet season or seven days during dry season shall be immediotely stabilized with the approved TESC me (e.g., seeding, mulching, plastic covering, etc.). 7. Any area needing TESC measures, not requiring immediote attention, sh be oddressed within fifteen (15) days. 8. The TESC facilities on inoctive sites shall be inspected and maintained a minimum of once o month or 48 hours following o storm event. The clearing operation shall not flush sediment —laden water into the downstream system. Stabilized construction entrances and roods shall be installed at the beginning of construction and maintained for the duration of the projec Additional measures, such as wash pads may be required to ensure th all paved areas are kept clean for the duration of the project. TESC CONSTRUCTION SEQUENCE 1. Pre — construction 2. Flog or fence clearing limits. 3. Post sign with nome and phone number of TESC supervisor. 4. Grode and install construction entrance(s). 5. Install perimeter protection (silt fence, brush bonier, straw waddle, etc. 6. . Grade and stabilize construction roods. 7. Construct surface water controls (interceptor dikes, pipe slope drains ponds, traps, etc.) simultaneously with clearing and grading for project development. 8. Maintain erosion control measures in accordance with King County standards and manufacturer's recommendations. 9. ' Relocate erosion control measurers or instoll new measures so that as site conditions change the erosion and sediment control is always in accordance with the King County. TESC minimum requirements. 10. Cover all areas that will be unworked for more than seven days during the dry season or two days during the wet season with straw, wood fi mulch, compost, plastic sheeting or equivalent. 11. Stabilize all areas that reach final grade within seven days. 12. Seed or sod ony areas to remoin unworked for more than 30 days. 13. Upon completion of project, all disturbed areas must be stabilized and bumps removed if appropriate. CALL 2 WORKING DA BEFORE YOU DIG 1 -800 -424 -5555 S once, ed be in for 11. Where straw mulch for temporary erosion control is required, it shall be applied at a minimum thickness. II to 30) of the l ode all er S (UNDERGROUND Urtury LOCATKINS ARE SHE 01 X SHE NAVD 88 --» • SEATTLE AREA - • ----- MHHW &97 E 11.32 E •M1-IW 8;12 ;10.47 E MEW 147 E 2.82 ■ -- W" —2 0 . 15 10 -5 15 5 FIELD 800K: 1075011 8/2003 SURVEYED: - APS -TJS ' 8/2003 Y BAsE µUp; APS -MAGG 8/2003 CHEDRED: APS -TJS 8/2003 MLLW M MLLW 1 +00 . MOTET- TO- GONVERT. - •SEATTLE -- AREA -TIDE TABLES--. DATUM, ADD 2.35 FT. IW DATE 0+00 0*00 MHHW = 8.97 MLLW 20'MIN SETBACK / M � JON HANSEN DEsictia MARK WILGUS IRREGULAR INITIAL EXCAVATION TO EREMOVE CONTAMINATED SOIL ADDITIONAL EXCAVATION AS UIKt41W 1N i t. I AppR0WD DON ALTHAUSER, Ph DESCN EN1ERED M. RADEL.A /I.ESUE RAGAN 8/2004 2 +00 9y 8/ 8/2004 8/2004 EtEer 1 +00 COMPACTED BY VIBIRAT10N METHOD 3tEQUIRED EIN AREA OF TEMPORARY LEVEE WITHIN 20' LAIN. SL TBACF QN —STYE. COMPETENT E3DRROW 1+00 EXCAVATION GRADE FED. AID No PROJECT No SURVEY No. MAINTENANCE DIVISION No SEION A -A SC-CON C - C 3 +00 • 1A1647 CTIONB -B -p- M 2 +00 2+00 bOST1NG ciRADE 1 caws t t /rs /oa APP GRADE-LEVELED 0 EXISTING GRAD 10' MIN DISTANCE TO REMAIN UNDIMMED QOSTING QONCRETE RETAINING 'MALL +�— TOO OF DOSTING WALL - 18.0' TO OF EXISTING WALL a -11.5' ...- -- WALL DEPTH NOT DETERMINED 3+00 IRREGULAR INITIAL �(C+RVA�1©N -�G REMOVE CONTAMINATEDL SOIL ADDITIONAL'• EXCAVATION AS DIRECTED IN THE FIELD. 3+00 4+00 King County Department of NeMal Resources and Parks Water and Land Resources Division Capital Projects and Open Space Acquisitions Section Surface Water • Engineering and Ecological Services Units Pan 8issonnette, Director 5+00 4 -� NORTH WIND'S SOL fL�W 1 MN 4+00 EXISTING CONCRETE RETAINING WALL -"— TOP OF EXISTING WALL r 17.4' TOE* OF EXISTING WALL = -13.0' WAIL DEPTH NOT DETEFIMINED 4+00 CALL 2 WORKING - DAYS " as BEFORE YOU DIG 1 -800- 424 -5555: UNDERGROUND UT1U11' LOCATIONS ARE . SHE 4 OF 5 SHE! -.SIZE BLACK COTTONWOOD TREES TO BE REMOVED WITHIN 100' - OF RIVER WHITE POPLAR TREES TO BE REMOVED) REPLACEMENT TREES REQUIRED • 4`— 8' DIAMETER 0 5 5 8— 12' DIAMETER • • 0 6 12 12 -18' DIAMETER 0' 16 64 18 -24' DIAMETER 1 5 36 > 24' DIAMETER 0 1 8 TOTAL qq 33 125 FIELD BOOK 1075011 SURVEYED; APS —TJS SURVEY BASE IMP: APS —MAGG CIS APS —TJS PROJECT No. SURVEY No. RETAINING WALL TREES %IN THIS AREA(SHADED) CAN BE CUT. STUMP TO REMAIN. SCALE IN FEET TREE CIE.ARING PERMIT NOTES 1. TREE SIZES, LOCATIONS AND SPECIES SHOWN ARE BASED ON A COMBINATION OF SURVEY AND FIELD MEASUREMENTS. NON — NATIVE SPECIES, TREES LESS THAN 12 INCHES DBH, AND THOSE OUTSIDE CIF THE 200 FOOT SHORELINE AREA WERE NOT. PART OF THE INRIAL SITE SURVEY AND WERE SUBSEQUENTLY ADDED BY IQ COUNTY ECOLOGIST. 2. CANOPY COVERAGE SHOWN IS ESTIMATED BASED ON FIELD OBSERVATIONS. 3. ALL DCISTING TREES ON SITE WILL BE REMOVED, EXCEPT AS SPECIFICALLY NOTED IN 20' VICINITY OF RETAIN! WALL, IN PREPARATION FOR REMOVAL OF CONTAMINATED SOILS. 4. ALL CLEARING DEBRIS (TREES. STUMPS, AND. SLASH) WILL BE REMOVED FROM THE SITE AND TAKEN TO YARD WASTE RECYCLING FACILRY OR TO A SURABLE DISPOSAL SITE. 5. REVEGETATION WILL NOT BE COMPLETED UNTIL THE SITE IS REGRADED IN ACCORDANCE WITH THE NORTH WINI WEIR INTERTIDAL RESTORATION PROJECT PROPOSED BY KING COUNTY AND THE U.S. ARMY CORPS OF ENGINEERS. TREE REPLACEMENT CALCULATIONS PER TMC 18.54.130.3B *UNDER THE CITY'S CURRENT REGULATIONS, MITIGATION FOR THE LOSS OF SIGNIFICANT TREES WOULD REQUIRE EACH REPLACEMENT TREE BE A NATIVE TREE WITH A MINIMUM OF A 2.5 —INCH CALIPER SIZE. EXISTING INTERTIDAL MARSH MEAN HIGHER HIGH WATER OF DUWAMISH (MHHW =8.97') 200 FOOT SHORELINE JURISDICTION COTTONWOOD TREE (Populus balsomifera) WHITE POPLAR (Populus alba) MINIS EDGE OF LOW IMPACT ZONE EDGE OF RIVER ENVIRONMENT ZONE ESTIMATED EDGE OF COTTONWOOD CANC ESTIMATED EDGE OF WHITE POPLAR CM CALL 2 WORKING DAYS BEFORE YOU DIG 1 -800 -424 -5555 (UNDERGROUND UTILITY LOCATIONS ARE SHE 01 IC SHE PLANT SCHEDULE SYMBOL: SCIENTIFIC NAME: COMMON NAME: SIZE: SPACING: QTY.: 10.47 MLW Fraxinus. totifolia Oregon Ash 4 -5 as shown 11 Picea . sitchensis Sitka Spruce 4 -5 as shown 8 Crotaegus douglosii Biack /Douglas Hawthorne 4-5 os shown Pinus contorta Shore Pine 4_ as shown 19 8 Pseudotsuga menziesii Douglas Fir 4— os shown 17 Populus balsamifera Cottonwood 4 -5 /s shown 18 Acer macrophyllum Big Leaf Maple 4 -5 3 s shown 11 Satix lasiandra Pacific Willow 2 gal. as shown 17 Salix hookeriano Hookers Willow 2 gal. as shown 13 Salix sitchensis Sitka Willow cuttings/ 2 go!. 18" o.c./ clustered Cornus stolonifera Red Twig Dogwood 2 gal. 4 ac 11 Corylus cornuto Western Hazelnut 3 -4 its Holodiscus discolor Ocean Spray 2 gal. shown 4 n.e. 99 34 Symphocapos albus Snowberry 2 gal. 4 o.c. 91 Lonicera involucrata Twinberry, black 5 gal. 3 s shown 5 Mahonia aquifolium Oregon Grape 2 gal. zs shown 10 Rosa gymnocorpa Wild Rose 2 got. as shown 22 \ \\ \` Aster' Subspicatus Douglas' Aster plug P g 18" o.c. 1500 8 000 Carer I Y n 9 Y b ei Lyngby's Sedge plug 18" o.c. Desdampsia caespitoso Tufted Hairgross plug plug 18" o.c. 18" o.c. 2500 1800 1500 Scirpus validus Soft Stem Bullrush Potentilla pacifica Pacific Silverweed plug 18" o.c. NAVD 88 SEATTLE AREA TIDE TABLES MHHW 8.97 11.32 MHW 8.12 10.47 MLW .47 2.82 MLLW —2.35 0 wavammansirsallat,,. INTERTIDAL MARSH LOCATION o�' PER FIELD OBSERVATION AND z MEASUREMENT, NOT SURVEYED ()King County Department of Natural Resources and Parks Water and Land Resources Division Capital Protects and Open Space Acquisitions Section Surface Water - Engineering and Ecological Services Units Pam Bissonneae, Director NORTH WIND'S A 1p� INTERTIDAL RES RESTORATION SHEET 6 OF 6 SHEETS 2004 -66 N /ACCESS 'FRAIL/ IDE CSBCi (CR HED ACI � BA / N OURSE N N NO VEGETATION MUDFLAT NOTE: TO CONVERT TO SEATTLE AREA TIDE TABLES DATUM, ADD 2.35 FT. INTERTIDAL EMERGENT VEGETATION RIPARIAN /UPLAND PLANTINGS 12 —TOP OF SLOPE TRANSRION: SCRUB /SHRUBS (ELEV. 10 -12) INTERTIDAL EMERGENT COMMUNITY (ELEV. 4 -10) MUDFLAT AREA NO PLANTING PROPOSED (ELEV. —1 TO Al WILDLIFE NESTING BOX GENERAL NOTES: 1. ADO 6 INCHES OF TOPSOIL TO ALL RANTING AREAS. TOPSOIL IS TO BE VVORKED/fILLED INTO TOP 12 INCHES OF EXISTING SOIL 2. MULCH AREAS ABOVE ELEV. 10 WITH 3 INCHES WOOD MULCH.