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HomeMy WebLinkAboutECF_SEPA_Checklist_250131_v1SEPA Environmental checklist September 2023 Page 1 (WAC 197-11-960) SEPA1 Environmental Checklist Purpose of checklist Governmental agencies use this checklist to help determine whether the environmental impacts of your proposal are significant. This information is also helpful to determine if available avoidance, minimization, or compensatory mitigation measures will address the prob able significant impacts or if an environmental impact statement will be prepared to further analyze the proposal. Instructions for applicants This environmental checklist asks you to describe some basic information about your proposal. Please answer each question accurately and carefully, to the best of your knowledge. You may need to consult with an agency specialist or private consultant for some questions. You may use “not applicable” or “does not apply” only when you can explain why it does not apply and not when the answer is unknown. You may also attach or incorporate by reference additional studies reports. Complete and accurate answers to these questions often avoid delays with the SEPA process as well as later in the decision-making process. 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 significant adverse impact. Instructions for lead agencies Please adjust the format of this template as needed. Additional information may be necessary to evaluate the existing environment, all interrelated aspects of the proposal and an analysis of adverse impacts. The checklist is considered the first but not necessarily the only source of information needed to make an adequate threshold determination. Once a threshold determination is made, the lead agency is responsible for the completeness and accuracy of the checklist and other supporting documents. Use of checklist for nonproject proposals For nonproject proposals (such as ordinances, regulations, plans and programs), complete the applicable parts of sections A and B, plus the Supplemental Sheet for Nonproject Actions (Part D). Please completely answer all questions that apply and note that the words "project," "applicant," and "property or site" should be read as "proposal," "proponent," and "affected geographic area," respectively. The lead agency may exclude (for non - projects) questions in “Part B: Environmental Elements” that do not contribute meaningfully to the analysis of the proposal. 1 https://ecology.wa.gov/Regulations-Permits/SEPA/Environmental-review/SEPA-guidance/Checklist-guidance SEPA Environmental checklist September 2023 Page 2 (WAC 197-11-960) A. Background Find help answering background questions2 1. Name of proposed project, if applicable: Longacres Campus Master Plan 2. Name of applicant: Unico Longacres Commercial East LLC, Unico Longacres Commercial South LLC, Unico Longacres Residential SW LLC, Unico Longacres Residential NW LLC 3. Address and phone number of applicant and contact person: Unico Properties 1326 5th Ave, Suite 800 Seattle WA 98101 Julia Reeve juliar@unicoprop.com Shaun Duigan shaund@unicoprop.com 4. Date checklist prepared: January 31, 2025. Master Site Plan Application 5. Agency requesting checklist: City of Renton WA 6. Proposed timing of schedule (including phasing, if applicable): The proposed schedule is to start Early Works for construction in Q4 of 2025. The Master Plan has three phases over a 10-15 year duration. 7. Do you have any plans for future additions, expansion, or further activity related to or connected with this proposal? If yes, explain. Not currently. 8. List any environmental information you know about that has been prepared, or will be prepared, directly related to this proposal. Following Items were prepared for the Longacres Campus Master Plan Application Alta Survey by NV5 Arborist Report by Salish Restoration Associates Critical Areas Report by Pace Engineers Drainage Report and Drainage Control Plan by Coughlin Porter Lundeen Geotechnical Report by Geoengineers Transportation and Parking Memo by TenW Previous environmental Review for Longacres Site SEPA application for Sounders FC Center at Longacres (December 2022) Draft Environmental Impact Statement, Longacres Office Park (August, 1994) Final Environmental Impact Statement, LOP (March, 1995) LOP Environmental Impact Statement, LOP (March, 1995) Environmental Checklist (December, 1996) and MDNS (January, 1997). Boeing BCAG Headquarters Building 2 https://ecology.wa.gov/Regulations-Permits/SEPA/Environmental-review/SEPA-guidance/SEPA-checklist- guidance/SEPA-Checklist-Section-A-Background SEPA Environmental checklist September 2023 Page 3 (WAC 197-11-960) Environmental Checklist (September, 1997) and MDNS (November, 1997), Boeing Family Care Center Environmental Checklist and MDNS (September, 1998) Boeing Surface Water Management Project Environmental Checklist for Development Agreement (2000) Environmental Checklist for development of lots 27-31 in Longacres (2015) 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 at this time at the Longacres Campus. The Sounders FC Center at Longacres completed a Conditional Use Permit and SEPA review in December 2022. 10. List any government approvals or permits that will be needed for your proposal, if known. City of Renton Master Site Plan (Hearing Examiner), Planned Urban Development, Development Agreement, Final Lot Boundary Adjustment. 11. Give brief, complete description of your proposal, including the proposed uses and the size of the project and site. There are several questions later in this checklist that ask you to describe certain aspects of your proposal. You do not need to repeat th ose answers on this page. (Lead agencies may modify this form to include additional specific information on project description.) Longacres has been an important place in the history of the Puget Sound region for the better part of the Century. Unico’s vision for the site is to continue and build upon that legacy with an innovative and forward-looking Master Plan that would be implemented over the next 10 years. The intent is to create a unique and vibrant mixed -use development in Renton. Currently there is +/- 330,000 SF of existing commercial office space (CO-Commercial Office) on the site and existing maintenance and utility buildings (IM- Industrial Medium). The Seattle Sounders FC Performance Center at Longacres (under separate Permit) is also a part of the Longacres Campus occupying approximately 13 acres to the West of Office Building 25-20. The Master Plan would add approximately 3,000 new residential units, approximately 1,400,000 sf of additional commercial office space, additional Light industrial space, Medical Office Building, a music venue, hotels and Retail, Parking, Roadways and Infrastructure. In addition to the above proposed uses, Longacres includes substantial natural resources that will be enhanced and expanded to serve as amenities to tenants and visitors of the campus. These natural resources provide habitat and connectivity for animals as well as places for people to be in nature. Additionally, these elements will be a part of the site resiliency. SEPA Environmental checklist September 2023 Page 4 (WAC 197-11-960) 12. Location of the proposal. Give sufficient information for a person to understand the precise location of your proposed project, including a street address, if any, and section, township, and range, if known. If a proposal would occur over a range of area, provide the range or boundaries of the site(s). Provide a legal description, site plan, vicinity map, and topographic map, if reasonably available. While you should submit any plans requi red by the agency, you are not required to duplicate maps or detailed plans submitted with any permit applications related to this checklist. The project name is the Longacres Campus Masterplan. The project location is proposed for the Longacres Office Park (LOP) in Renton, Washington. Within the LOP, the “Site” is comprised of lots 3, 4, 6, 7, 8, 9, 10,11,12,13, 14, 15, 16, 17, 18, 19, 20, and 21, Tract 1 and 2 of City of Renton LLA No. LUA23-000366, King County Recording No. 20240322000285, City of Renton, King County, WA. The address of the site is 1901 Oakesdale Avenue SW. The Site includes one existing office buildings. Building 25-20 (approximately 311,982 gsf) located at 1901 Oakesdale. The Site includes maintenance building 25-02 (approximately 25,416 gsf) located at 1302 SW 16th St. and building 25-03 (approximately 9,945 gsf) located at 1300 Southwest 16th St. The Project Site overall is approximately 120 acres. B. Environmental Elements 1. Earth Find help answering earth questions3 a. General description of the site: Circle or highlight one: Flat, rolling, hilly, steep slopes, mountainous, other: The Site is generally flat and located in a floodplain. b. What is the steepest slope on the site (approximate percent slope)? Localized slopes adjacent to the existing ponds approach 33%, but generally the topography is less than 5% with the majority of the area below 2%. 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 agricultural land of long-term commercial significance and whether the proposal results in removing any of these soils. The general subsurface conditions consist of relatively shallow fill overlying alluvium. The Fill generally consists of very soft to stiff silt with varying amounts of sand, gravel and organic matter and loose to medium dense sand with varying amounts of silt, gravel and organic matter. Fill thickness varies across the site and is up to approximately 6 feet thick. Alluvium was encountered near the existing ground surface or beneath the fill. The 3 https://ecology.wa.gov/regulations-permits/sepa/environmental-review/sepa-guidance/sepa-checklist- guidance/sepa-checklist-section-b-environmental-elements/environmental-elements-earth SEPA Environmental checklist September 2023 Page 5 (WAC 197-11-960) alluvium generally consists of very soft to medium stiff silt with varying amounts of sand and organic matter and very loose to medium dense sand with varying amounts of silt, gravel and organic matter in the upper approximately 20 to 25 feet. Thin layers of peat and organic silt were observed at various locations across the Longacres Campus within this upper portion of alluvial soils. Beneath this upper generally fine-grained layer of alluvium, the unit transitions to denser coarse-grained deposits consisting mostly of sand. These deeper coarse-grained deposits generally consist of medium dense to dense sand with varying amounts of silt and gravel. Occasional layers of gravel were observed within the deeper alluvial soils. Some of the sand and gravel layers are very dense. Although not encountered in many explorations, occasional large woody debris such as logs exist within the alluvial soils, and rubble or other debris may be encountered in the fill from previous grading and development activities. The ground water levels in the vicinity of the site are expected to fluctuate seasonally and be near the ground surface during the wet season. See attached Geotechnical Report by Geotechnical Engineering R_Geotechnical_Report_250131_v1 for additional information. d. Are there surface indications or history of unstable soils in the immediate vicinity? If so, describe. See attached Geotechnical Report by Geotechnical Engineering R_Geotechnical_Report_250131_v1 for additional information. e. Describe the purpose, type, total area, and approximate quantities and total affected area of any filling, excavation, and grading proposed. Indicate source of fill. See attached Grading Plans by Coughlin Porter Lundeen for additional information. See attached P_Civil_Plans_250131_v1 f. Could erosion occur because of clearing, construction, or use? If so, generally describe. Standard risk of erosion exists due to the nature of construction. Any potential erosion risk will be mitigated by best management practices as permitted and inspected by the City of Renton. See attached Geotechnical Report R_Geotechnical_Report_250131_v1 for additional information. g. About what percent of the site will be covered with impervious surfaces after project construction (for example, asphalt or buildings)? The site will target 71% impervious surfaces after project construction, maintaining the campuses design requirements for this basin. h. Proposed measures to reduce or control erosion, or other impacts to the earth, if any. Standard BMPs and code required measures will be implemented prior to earth moving activated and monitoring will be provided as required by the State and City. SEPA Environmental checklist September 2023 Page 6 (WAC 197-11-960) 2. Air Find help answering air questions4 a. What types of emissions to the air would result from the proposal during construction, operation, and maintenance when the project is completed? If any, generally describe and give approximate quantities if known. Emissions from construction machinery and trucks during construction activities at the site as well as grading and fill activities could occur. New paving and associated street and parking lot painting will occur on the site for the new roads and parking areas. There will be soil removal and adding of soil during construction which will create dust when there is excavation, grading and filling. Typically building and site maintenance, and daily operations for the future office, retail and residential buildings once the masterplan is complete could occur. b. Are there any off-site sources of emissions or odor that may affect your proposal? If so, generally describe. No Off-site is expected. c. Proposed measures to reduce or control emissions or other impacts to air, if any: Standard measures will be put in place to reduce and control emissions. Temporary controls and measures will be put in place during construction that could include wheel wash stations, crushed rock construction entrances, maintaining clean roadways and other standard measures. 3. Water Find help answering water questions5 a. Surface: Find help answering surface water questions6 1. Is there any surface water body on or in the immediate vicinity of the site (including year-round and seasonal streams, saltwater, lakes, ponds, wetlands)? If yes, describe type and provide names. If appropriate, state what stream or river it flows into. The site contains two large ponds, Wetland A and Storm Pond B which are located in the middle of the Site. Additionally there are a number of wetlands of varying sizes and 4 https://ecology.wa.gov/Regulations-Permits/SEPA/Environmental-review/SEPA-guidance/SEPA-checklist- guidance/SEPA-Checklist-Section-B-Environmental-elements/Environmental-elements-Air 5 https://ecology.wa.gov/Regulations-Permits/SEPA/Environmental-review/SEPA-guidance/SEPA-checklist- guidance/SEPA-Checklist-Section-B-Environmental-elements/Environmental-elements-3-Water 6 https://ecology.wa.gov/Regulations-Permits/SEPA/Environmental-review/SEPA-guidance/SEPA-checklist- guidance/SEPA-Checklist-Section-B-Environmental-elements/Environmental-elements-3-Water/Environmental- elements-Surface-water SEPA Environmental checklist September 2023 Page 7 (WAC 197-11-960) various other stormwater features. At the Northeast corner the Site abuts Springbrook Creek. See Critical Areas – Existing Conditions Report by PACE Engineers. 2. Will the project require any work over, in, or adjacent to (within 200 feet) the described waters? If yes, please describe and attach available plans. Yes, See attached Site Plans. 3. Estimate the amount of fill and dredge material that would be placed in or removed from surface water or wetlands and indicate the area of the site that would be affected. Indicate the source of fill material. The project doesn’t currently propose to dredge or fill any existing wetlands. Expansion of Pond B is planned to make up for the removal of a separate on-site detention and floodplain mitigation pond (Kaiser Pond). The source of the fill material will be determined closer to the expected construction date and further details will be provided. 4. Will the proposal require surface water withdrawals or diversions? Give a general description, purpose, and approximate quantities if known. Additional details will be provided in the EIS process as needed. 5. Does the proposal lie within a 100-year floodplain? If so, note location on the site plan. Yes, a significant portion of the proposal lies within a 100-year floodplain. See Site Plan prepared by Coughlin Porter Lundeen. See attached P_Civil_Plans_250131_v1. 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. Additional details will be provided in the EIS process as needed. b. Ground: Find help answering ground water questions7 1. Will groundwater be withdrawn from a well for drinking water or other purposes? If so, give a general description of the well, proposed uses and approximate quantities withdrawn from the well. Will water be discharged to groundwater? Give a general description, purpose, and approximate quantities if known. The proposal does not include a well for groundwater use. The groundwater levels in the vicinity of the site will fluctuate as a function of season, precipitation and water levels in the Green River. Based on review of the available subsurface information, the regional groundwater table in the project varies seasonally at the site and is near the ground surface elevation during extended periods of wet weather. 2. Describe waste material that will be discharged into the ground from septic tanks or other sources, if any (domestic sewage; industrial, containing the following 7 https://ecology.wa.gov/Regulations-Permits/SEPA/Environmental-review/SEPA-guidance/SEPA-checklist- guidance/SEPA-Checklist-Section-B-Environmental-elements/Environmental-elements-3-Water/Environmental- elements-Groundwater SEPA Environmental checklist September 2023 Page 8 (WAC 197-11-960) 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. No waste materials are planned to be discharged into the ground. c. Water Runoff (including stormwater): 1. Describe the source of runoff (including storm water) and method of collection and disposal, if any (include quantities, if known). Where will this water flow? Will this water flow into other waters? If so, describe. Runoff from stormwater will be collected in on-site conveyance systems. The runoff collected from pollution generating sources will be treated for Enhanced Basic requirements and discharged into the existing Wetland A and Pond B, both of which were originally designed as part of the water quality system. Prior to construction, the civil engineer will prepare a Temporary Erosion and Sediment Control Plan (TESCP) and a Storm Water Pollution Prevention Plan (SWPPP) for the general contractor to use to manage stormwater discharge during construction, consistent with applicable regulations. 2. Could waste materials enter ground or surface waters? If so, generally describe. Waste materials will be prevented from entering the ground or surface waters with all runoff from these areas captured and routed through the water quality Enhanced Basic stormwater treatment vaults proposed. 3. Does the proposal alter or otherwise affect drainage patterns in the vicinity of the site? If so, describe. No, the proposal does not alter drainage patterns in the vicinity of the site. d. Proposed measures to reduce or control surface, ground, and runoff water, and drainage pattern impacts, if any: See the attached Stormwater Management Plan and Drainage report prepared by Coughlin Porter Lundeen. See attached P_Civil_Plans_250131_v1. 4. Plants Find help answering plants questions a. Check the types of vegetation found on the site: ☒ deciduous tree: alder, maple, aspen, other ☒ evergreen tree: fir, cedar, pine, other ☒ shrubs ☒ grass ☐ pasture ☐ crop or grain SEPA Environmental checklist September 2023 Page 9 (WAC 197-11-960) ☐ orchards, vineyards, or other permanent crops. ☒ wet soil plants: cattail, buttercup, bullrush, skunk cabbage, other ☒ water plants: water lily, eelgrass, milfoil, other ☒ other types of vegetation b. What kind and amount of vegetation will be removed or altered? c. List threatened and endangered species known to be on or near the site. See Critical Areas Report with conceptual mitigation plan dated January 2025, prepare d by PACE Engineers, Inc. The report includes a biological evaluation and habitat assessment in Section 6. The biological and habitat assessment identifies six ESA -listed species and essential fish habitat within the project area. The report concludes that t he construction and operation of the proposed development is not likely to directly affect any ESA-listed species or habitat and will not result in a “take” as defined by the Endangered Species Act. See attached RS_Criticial_Areas_Report_250131_v1. d. Proposed landscaping, use of native plants, or other measures to preserve or enhance vegetation on the site, if any. See attached Conceptual Landscape Plan by Hewitt Architects. See P_Landscape_Plans_250131_v1. e. List all noxious weeds and invasive species known to be on or near the site. invasive Himalayan blackberry ( Rubus armeniacus), reed canary grass ( Phalaris arundinacea), and English Ivy (Hedera helix) are on site and are listed as invasive. See Critical Areas Report by PACE Engineers for additional information. See attached RS_Criticial_Areas_Report_250131_v1. 5. Animals Find help answering animal questions8 a. List any birds and other animals that have been observed on or near the site or are known to be on or near the site. Birds: Duck, Geese, Herons, Eagles, Hawks, Songbirds, Other Mammals: Coyote, Rabbits, Squirrels, Raccoon, Moles Fish: Trout, Other Reptiles: Turtles, Other Examples include: • Birds: hawk, heron, eagle, songbirds, other: 8 https://ecology.wa.gov/Regulations-Permits/SEPA/Environmental-review/SEPA-guidance/SEPA-checklist- guidance/SEPA-Checklist-Section-B-Environmental-elements/Environmental-elements-5-Animals SEPA Environmental checklist September 2023 Page 10 (WAC 197-11-960) • Mammals: deer, bear, elk, beaver, other: • Fish: bass, salmon, trout, herring, shellfish, other: b. List any threatened and endangered species known to be on or near the site. c. Six ESA-listed species are potentially within the project area as discussed in Section 6 – Habitat, of the Critical Areas Report dated January 2025. The following species are potentially present in the project area: d. Puget Sound ESU Chinook Salmon (Oncorhynchus tshawytscha) e. Puget Sound Steelhead DPS (Oncorhynchus mykiss) f. Coastal/Puget Sound Bull Trout ( Salvelinus confluentus) g. North American Wolverine (Gulo gulo luscus) h. Marbled Murrelet (Brachyramphus marmoratus) i. Western Yellow-billed Cuckoo (Coccyzus americanus) j. While there is no fish access available to the site from adjacent streams, resident and anadromous fish, including Chinook, pink, sockeye, chum and coho salmon, cutthroat trout, and winter steelhead have been observed throughout the basin and in proximity to the site (King County 2016). In addition, National Marine Fisheries NOAA have designated the Puget Sound and its watershed as Essential Fish Habitat for Chinook, coho, and pink salmon. Two ESA-listed salmon species have designated critical habitat outside the Project area, at Springbrook Creek (70 FR 52629; 81 FR 9251). However, the listed species and their habitat have not been documented within the area proposed for redevelopment. k. Is the site part of a migration route? If so, explain. l. Yes. The Puget Sound is located within the Pacific Flyway Migratory Bird route. m. Proposed measures to preserve or enhance wildlife, if any. None. Impacts to wildlife are not anticipated. n. List any invasive animal species known to be on or near the site. None Known. 6. Energy and natural resources Find help answering energy and natural resource questions9 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. 9 https://ecology.wa.gov/Regulations-Permits/SEPA/Environmental-review/SEPA-guidance/SEPA-checklist- guidance/SEPA-Checklist-Section-B-Environmental-elements/Environmental-elements-6-Energy-natural-resou SEPA Environmental checklist September 2023 Page 11 (WAC 197-11-960) The Longacres Master Plan proposes to plan for electric and natural gas to be available at the Site for future development. This will be used for heating, cooling and power in typical residential, commercial, retail, music venue, light industrial and hotel use. The site also has a Central Utility Plant that could be expanded to provide heating and cooling to more buildings. b. Would your project affect the potential use of solar energy by adjacent properties? If so, generally describe. The additional buildings and trees planned on the Site for the Longacres Master Plan could cast shadows on adjacent properties. The Site is bordered by 405 to the North, BNSF Railway to the West and Springbrook Creek and a few Industrial Buildings to the East, greatly reducing the affect on potential use of solar energy. c. What kinds of energy conservation features are included in the plans of this proposal? List other proposed measures to reduce or control energy impacts, if any. None. 7. Environmental health Health Find help with answering environmental health questions10 a. Are there any environmental health hazards, including exposure to toxic chemicals, risk of fire and explosion, spill, or hazardous waste, that could occur because of this proposal? If so, describe. 1. Describe any known or possible contamination at the site from present or past uses. The broader Longacres Site has been the subject of subsurface environmental assessments completed for Boeing. The assessments identified limited soil and groundwater impacts associated with former racetrack operations, specifically in areas of former maintenance operations. Remediation activities were subsequently completed by Boeing in areas of maintenance shops, which included the removal of five underground storage tanks and excavation of petroleum contaminated soil and groundwater monitoring. No Further Action determinations were issued by the WA State Dept. of Ecology in 2011 for releases associated with the former USTs. There is a NFA from the WA Dept of Ecology to address contamination on the Longacres site where a previous racetrack was located. In addition, all construction activities will be subject to a construction mitigation plan and BMPs. When required supplemental soil management plans as identified in the Unico-Boeing CCRs, which exceed any obligations required under federal, state, or local regulations will be prepared and implemented. 10 https://ecology.wa.gov/Regulations-Permits/SEPA/Environmental-review/SEPA-guidance/SEPA-checklist- guidance/SEPA-Checklist-Section-B-Environmental-elements/Environmental-elements-7-Environmental-health SEPA Environmental checklist September 2023 Page 12 (WAC 197-11-960) Information from the Ecology Tacoma Smelter Plume website indicates the site is in the area potentially impacted by the ASARCO Company smelter Plume. There is no site-specific information regarding concentrations of arsenic and lead, but such contaminants could be present on the site. Reports show that sampling was completed at the Bright Horizons Daycare Center across Oakesdale by King County Health Department under Ecology’s Soil Safety Program for childcare centers that meet state standards. Soil testing and soil management plans will meet any obligations under federal, state or local regulations, including the Tacoma Smelter Plume Remedies Guidance prepared by the Department of Ecology. 2. Describe existing hazardous chemicals/conditions that might affect project development and design. This includes underground hazardous liquid and gas transmission pipelines located within the project area and in the vicinity. None are known at this time. 3. Describe any toxic or hazardous chemicals that might be stored, used, or produced during the project's development or construction, or at any time during the operating life of the project. Not known at this time, but the applicant does expect that fuel for equipment may be stored on site during construction and would be subject to proper spill control measures per the Department of Ecology requirements. When needed any toxic or hazardous chemicals being used, stored or produced on site during construction or operation would be handled in accordance with applicable regulations. 4. Describe special emergency services that might be required. None known at this time to be required. 5. Proposed measures to reduce or control environmental health hazards, if any. During the construction process personnel will attend to fueling process to ensure any spills will be limited volume and a full spill response kit will be maintained on site in case of any accident. b. Noise 1. What types of noise exist in the area which may affect your project (for example: traffic, equipment, operation, other)? Traffic. 2. What types and levels of noise would be created by or associated with the project on a short-term or a long-term basis (for example: traffic, construction, operation, other)? Indicate what hours noise would come from the site)? Construction noise during the construction phases at the Site. Typically traffic and operation noise are expected with the types of proposed site uses during the day. The proposed music venue will have evening shows on weekend days and evenings from approximately May to October. 3. Proposed measures to reduce or control noise impacts, if any: SEPA Environmental checklist September 2023 Page 13 (WAC 197-11-960) Noise impacts outside of the music venue will be avoided by compliance with the Renton noise code (RMC ch. 8-7). With no immediate neighbors in the office park, no nearby residential receiving sites, and given the proximity and noise generated by Interstate 405, noise is not anticipated to affect, burden or create a nuisance to any other property owner or user. The proposed location of the music venue which is away from residential uses, the limited yearly schedule and evening hours are proposed to help minimize and control the noise impacts at the site. 8. Land and shoreline use Find help answering land and shoreline use questions11 a. What is the current use of the site and adjacent properties? Will the proposal affect current land uses on nearby or adjacent properties? If so, describe. The Site has been used as office space and industrial. Adjacent properties include medical offices, daycare, and commercial airlines uses, and are separated from the Project site by, right of way, vacant, or undevelopable land. The proposed use is office space, retail, hotel, music venue, residential, medical office building and light industrial. The proposal is not expected to affect current land uses on nearby or adjacent properties. b. Has the project site been used as working farmlands or working forest lands? If so, describe. How much agricultural or forest land of long-term commercial significance will be converted to other uses because of the proposal, if any? If resource lands have not been designated, how many acres in farmland or forest land tax status will be converted to nonfarm or nonforest use? The Site was used as farmland in the early 20th Century. Any farmland on the Site was converted decades ago with the development of the Longacres racetrack and the subsequent redevelopment of the Boeing Headquarters. No agricultural or forest land of long-term significance will be converted to other uses as a result of this proposal. 1. Will the proposal affect or be affected by surrounding working farm or forest land normal business operations, such as oversize equipment access, the application of pesticides, tilling, and harvesting? If so, how? No. c. Describe any structures on the site. The Site includes one existing office buildings. Building 25-20 (approximately 311,982 gsf) located at 1901 Oakesdale Ave SW. The Site includes maintenance building 25-02 (approximately 25,416 gsf) located at 1302 SW 16th St. and building 25 -03 (approximately 9,945 gsf) located at 1300 SW 16th St. and building 25-01 (approximately 21,083 gsf) at 1900 Oakesdale Ave SW. 11 https://ecology.wa.gov/Regulations-Permits/SEPA/Environmental-review/SEPA-guidance/SEPA-checklist- guidance/SEPA-Checklist-Section-B-Environmental-elements/Environmental-elements-8-Land-shoreline-use SEPA Environmental checklist September 2023 Page 14 (WAC 197-11-960) d. Will any structures be demolished? If so, what? Yes, building 25-01 located at 1900 Oakesdale Ave SW and the maintenance building 1300 SW 16th St. will be demolished. e. What is the current zoning classification of the site? CO-commercial Office and IM- Industrial Medium are the current zoning classification of the Site. What is the current comprehensive plan designation of the site? The Comprehensive Plan Land Use Designation for the Site is Employment Area (“EA”) f. If applicable, what is the current shoreline master program designation of the site? A portion of the Site is withing the Shoreline Jurisdiction for the City of Renton. Parcel 2423049022 is adjacent to Springbrook Creek to the East and a section of regulated Shoreline, BRSC-B Black River/Springbrook Creek Reaches. g. Has any part of the site been classified as a critical area by the city or county? If so, specify. Yes, Wetlands and Streams on or adjacent to the Site are classified as critical areas by the City of Renton. h. Approximately how many people would reside or work in the completed project? Approximately 10,000-12,000 people would reside or work in the completed project. i. Approximately how many people would the completed project displace? The completed project will displace no people. j. Proposed measures to avoid or reduce displacement impacts, if any. The completed project will displace no people. k. Proposed measures to ensure the proposal is compatible with existing and projected land uses and plans, if any. None. l. Proposed measures to reduce or control impacts to agricultural and forest lands of long-term commercial significance, if any: None. 9. Housing Find help answering housing questions12 Approximately how many units would be provided, if any? Indicate whether high, middle, or low-income housing. Approximately 3,000 units are proposed to be provided at the Site. 12 https://ecology.wa.gov/Regulations-Permits/SEPA/Environmental-review/SEPA-guidance/SEPA-checklist- guidance/SEPA-Checklist-Section-B-Environmental-elements/Environmental-elements-9-Housing SEPA Environmental checklist September 2023 Page 15 (WAC 197-11-960) a. Approximately how many units, if any, would be eliminated? Indicate whether high, middle, or low-income housing. No units are eliminated in this proposal. b. Proposed measures to reduce or control housing impacts, if any: None. No units are eliminated in this proposal. 10. Aesthetics Find help answering aesthetics questions13 a. What is the tallest height of any proposed structure(s), not including antennas; what is the principal exterior building material(s) proposed? All parcels are restricted by the FAA airport height restrictions. All illustrative buildings are below this elevation which varies based on the overlay of this requirement. The building heights exemplified in the illustrative plan vary from 56- feet to 170-feet. There are no materials currently designated for the illustrative plan since the buildings shown are not final designs. Any future design will comply with the design guidelines outlines in RMC 4-3-100. b. What views in the immediate vicinity would be altered or obstructed? The interior parcels associated with the Longacres parcels are illustratively proposed to consolidate and define building massing and provide a vantage point to view the natural common open space of the wetlands. Those parcels located along Oaksdale demonstrate building massing which further define the public way. These buildings are proposed to be tall enough to create a vantage point for viewing the campus of buildings and the shared natural common space. c. Proposed measures to reduce or control aesthetic impacts, if any : There will be future opportunities to review aesthetic impacts once individual parcels are developed. The Master Plan Development Agreement, The Planned Urban Development Plan will also be put in place and are proposed measure to control aesthetic impacts for the Longacres Campus. 11. Light and glare Find help answering light and glare questions14 a. What type of light or glare will the proposal produce? What time of day would it mainly occur? Although the site and building lighting system and fixtures have not yet been chosen, lighting will be selected to reduce glare and light pollution. Lighting will be directed to focus on streets, sidewalks and public plazas to provide a night-time safe environment. 13 https://ecology.wa.gov/Regulations-Permits/SEPA/Environmental-review/SEPA-guidance/SEPA-checklist- guidance/SEPA-Checklist-Section-B-Environmental-elements/Environmental-elements-10-Aesthetics 14 https://ecology.wa.gov/Regulations-Permits/SEPA/Environmental-review/SEPA-guidance/SEPA-checklist- guidance/SEPA-Checklist-Section-B-Environmental-elements/Environmental-elements-11-Light-glare SEPA Environmental checklist September 2023 Page 16 (WAC 197-11-960) b. Could light or glare from the finished project be a safety hazard or interfere with views? None known at this time. c. What existing off-site sources of light or glare may affect your proposal? There are no known off-site sources of light or glare that would affect the current proposal. d. Proposed measures to reduce or control light and glare impacts, if any: It is the intention that any future measures to control light and glare would implement dark-sky compliance and be designed to limit impact on wetlands and critical areas. 12. Recreation Find help answering recreation questions a. What designated and informal recreational opportunities are in the immediate vicinity? There are walking and biking trails in the Longacres Campus. There is a pedestrian and bike path that connects the Tukwila Sounder Train station to the West of the property with the Eastern side of the property. There are a number of opportunities along th e various walking and biking paths on the property to view the wetlands, ponds and wildlife. See Site Plan for map of paths. To the Northwest of the Site is Tukwila Park and to the West the Green River and Green River Trail. To the Northwest is the Starfire Sports Fields, which are the Sounders current practice facilities. The east is the Springbrook trail and Springbrook Creek. b. Would the proposed project displace any existing recreational uses? If so, describe. The Project proposes to keep the existing trails through the Site. There may be some impacts to wildlife viewing with added trails, roads and building. c. Proposed measures to reduce or control impacts on recreation, including recreation opportunities to be provided by the project or applicant, if any: The project proposes to maintain existing opportunities for wildlife viewing when feasible as well as add more trails and park areas to the Site. 13. Historic and cultural preservation Find help answering historic and cultural preservation questions15 a. Are there any buildings, structures, or sites, located on or near the site that are over 45 years old listed in or eligible for listing in national, state, or local preservation registers? If so, specifically describe. None. Boeing constructed the existing buildings and related infrastructure on the Site within the last 45 years. None of the building, structures, or site is listed on or eligible for listing in the National or state preservation registers. 15 https://ecology.wa.gov/Regulations-Permits/SEPA/Environmental-review/SEPA-guidance/SEPA-checklist- guidance/SEPA-Checklist-Section-B-Environmental-elements/Environmental-elements-13-Historic-cultural-p SEPA Environmental checklist September 2023 Page 17 (WAC 197-11-960) b. Are there any landmarks, features, or other evidence of Indian or historic use or occupation? This may include human burials or old cemeteries. Are there any material evidence, artifacts, or areas of cultural importance on or near the site? Please list any professional studies conducted at the site to identify such resources. None known. See Renton/Boeing 1994 DEIS for the Longacres Office Park, Ch. 13 ( Historical Resources) and the 1995 FEIS for an extensive study of historical and cultural resources for the Longacres Campus. Professional Studies are associated with the SHPO Determination 072192-01-K1 Resource Inventory 10/7/1992 ( SHPO Determined date 06/16/2008). Longacres Park was not included in the State or National Registers of Historic Places because the collective alterations to the site were too great to meet the integrity criteria as described in a Letter from the Office of Archaeology and Historic Preservation dated May 18, 1993, which provided the outcome of the council’s review. Construction since 1992 would be less than 45 years old and thereby excluded. c. Describe the methods used to assess the potential impacts to cultural and historic resources on or near the project site. Examples include consultation with tribes and the department of archeology and historic preservation, archaeological surveys, historic maps, GIS data, etc. Review and analysis of the following: • Renton/Boeing 1994 DEIS, Ch. 13 ( Historical Resources), Renton/Boeing FEIS, and other environmental review documents associated with Longacres ( with attention to historical resources) • Muckleshoot Indian Tribe Comment letters regarding proposed development at Longacres requesting notification if any resources are found during excavation) Subsequent SEPA checklists for proposed Longacres improvements. • DAHP WISSARD database. • Puget Sound archives. • King County GIS Maps and City of Renton Maps. The DEIS, DAHP database, and the archives included historical materials on the development and use of the Site and broader Campus dating back to “Western” settlement. The site has been redeveloped on at least three separate occasions: ( 1) farming, ( 2) Longacres horse racetrack, ( 3) Boeing Headquarters, which included extensive stormwater and drainage facilities in the fields surrounding Building 25 -20. The Boeing Longacres Campus was developed in phases. The checklist associated with each phase notes that previous development did not find any potential archeological evidence. Thus, it is highly likely that this proposal will not encounter any potential archeological evidence, especially since this area of the Campus was already developed. d. Proposed measures to avoid, minimize, or compensate for loss, changes to, and disturbance to resources. Please include plans for the above and any permits that may be required. No permits are required. Extensive redevelopment activity has already occurred at the Site with no findings of any resources. However, the applicant will halt work and contact SEPA Environmental checklist September 2023 Page 18 (WAC 197-11-960) the City of Renton, DAHP, and the Muckleshoot Indian Tribe if any potential archeological evidence is encountered during site work. 14. Transportation Find help with answering transportation questions16 a. Identify public streets and highways serving the site or affected geographic area and describe proposed access to the existing street system. Show on site plans, if any. Traffic Engineers North West has prepared the attached traffic scoping memo and will work to develop the study for the Project. Additional information will be provided during the EIS process. See attached RS_Longacres_Master_Plan_Trip_Generation_and_Scoping_Memorandum_250131_v1 b. Is the site or affected geographic area currently served by public transit? If so, generally describe. If not, what is the approximate distance to the nearest transit stop? The Tukwila Sounders Train Stop is within approximately ¼ mile of the site and Oakesdale has a bus route with the nearest stop adjacent to Eastern board of the site (within 100’). c. Will the proposal require any new or improvements to existing roads, streets, pedestrian, bicycle, or state transportation facilities, not including driveways? If so, generally describe (indicate whether public or private). Yes, the proposal will require new roads, paths, stormwater conveyance, lighting, signage and other roadway infrastructure. See attached Site Plan for proposed road layout. The Project proposes that there will be a combination of public and private ownership. See attached P_Civil_Plans_250131_v1. d. Will the project or proposal use (or occur in the immediate vicinity of) water, rail, or air transportation? If so, generally describe. The project will use the Sounders Train for people to commute to and from the site or visit the site from Seattle and other stations on the Sounders Train Line. There is also a bus stop for the King County Metro F Bus Rapidride on Oakesdale near Building 2 5-20, which links to the Tukwila Transit Center, and Burien Transit Center, and the Landing. e. How many vehicular trips per day would be generated by the completed project or proposal? If known, indicate when peak volumes would occur and what percentage of the volume would be trucks (such as commercial and nonpassenger vehicles). What data or transportation models were used to make these estimates? Traffic Engineers North West has prepared the attached traffic scoping memo and will work to develop the study for the Project. Additional information will be provided during the EIS process. See attached RS_Longacres_Master_Plan_Trip_Generation_and_Scoping_Memorandum_250131_v1 16 https://ecology.wa.gov/Regulations-Permits/SEPA/Environmental-review/SEPA-guidance/SEPA-checklist- guidance/SEPA-Checklist-Section-B-Environmental-elements/Environmental-elements-14-Transportation SEPA Environmental checklist September 2023 Page 19 (WAC 197-11-960) f. Will the proposal interfere with, affect, or be affected by the movement of agricultural and forest products on roads or streets in the area? If so, generally describe. No. g. Proposed measures to reduce or control transportation impacts, if any: Traffic Engineers North West has prepared the attached traffic scoping memo and will work to develop the study for the Project. Additional information will be provided during the EIS process. See attached RS_Longacres_Master_Plan_Trip_Generation_and_Scoping_Memorandum_250131_v1 15. Public services Find help answering public service questions17 a. Would the project result in an increased need for public services (for example: fire protection, police protection, public transit, health care, schools, other)? If so, generally describe. Yes with the additional buildings there will be an increase in the need for fire protection and police protection. Additionally, there will be an increase in the need for schools with the addition of residential units. b. Proposed measures to reduce or control direct impacts on public services, if any. These measures are anticipated to be defined and put in place during the EIS and permitting process. 16. Utilities Find help answering utilities questions18 a. Circle utilities currently available at the site: electricity, natural gas, water, refuse service, telephone, sanitary sewer, septic system, other: b. Describe the utilities that are proposed for the project, the utility providing the service, and the general construction activities on the site or in the immediate vicinity which might be needed. The proposal includes expansion of existing utilities currently available at the site. New electrical, natural gas, water, refuse service, telephone, and sanitary sewer networks will be constructed as proposed in the Master Plan drawings. See attached P_Civil_Plans_250131_v1. 17 https://ecology.wa.gov/regulations-permits/sepa/environmental-review/sepa-guidance/sepa-checklist- guidance/sepa-checklist-section-b-environmental-elements/environmental-elements-15-public-services 18 https://ecology.wa.gov/regulations-permits/sepa/environmental-review/sepa-guidance/sepa-checklist- guidance/sepa-checklist-section-b-environmental-elements/environmental-elements-16-utilities SEPA Environmental checklist September 2023 Page 20 (WAC 197-11-960) C. Signature Find help about who should sign19 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. Recoverable Signature X Julia Reeve Signed by: 45668a6a-d28e-448c-b130-0fc12de17265 Type name of signee: Position and agency/organization: Date submitted: D. Supplemental sheet for nonproject actions Find help for the nonproject actions worksheet20 Do not use this section for project actions. Because these questions are very general, it may be helpful to read them in conjunction with the list of the elements of the environment. When answering these questions, be aware of the extent the proposal, or the types of activities likely to result from the proposal, would affect the item at a greater intensity or at a faster rate than if the proposal were not implemented. Respond briefly and in general terms. 1. How would the proposal be likely to increase discharge to water; emissions to air; production, storage, or release of toxic or hazardous substances; or production of noise? • Proposed measures to avoid or reduce such increases are: 2. How would the proposal be likely to affect plants, animals, fish, or marine life? • Proposed measures to protect or conserve plants, animals, fish, or marine life are: 19 https://ecology.wa.gov/Regulations-Permits/SEPA/Environmental-review/SEPA-guidance/SEPA-checklist- guidance/SEPA-Checklist-Section-C-Signature 20 https://ecology.wa.gov/regulations-permits/sepa/environmental-review/sepa-guidance/sepa-checklist- guidance/sepa-checklist-section-d-non-project-actions SEPA Environmental checklist September 2023 Page 21 (WAC 197-11-960) 3. How would the proposal be likely to deplete energy or natural resources? • Proposed measures to protect or conserve energy and natural resources are: 4. How would the proposal be likely to use or affect environmentally sensitive areas or areas designated (or eligible or under study) for governmental protection, such as parks, wilderness, wild and scenic rivers, threatened or endangered species habitat, historic or cultural sites, wetlands, floodplains, or prime farmlands? • Proposed measures to protect such resources or to avoid or reduce impacts are: 5. How would the proposal be likely to affect land and shoreline use, including whether it would allow or encourage land or shoreline uses incompatible with existing plans ? • Proposed measures to avoid or reduce shoreline and land use impacts are: 6. How would the proposal be likely to increase demands on transportation or public services and utilities? • Proposed measures to reduce or respond to such demand(s) are: 7. Identify, if possible, whether the proposal may conflict with local, state, or federal laws or requirements for the protection of the environment.