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HomeMy WebLinkAboutECF_SEPA_Checklist_221010_v1 SEPA Environmental checklist (WAC 197-11-960) July 2016 Page 1 of 20 SEPA 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 probable 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. A. Background [HELP] 1. Name of proposed project, if applicable: Sounders FC Center at Longacres SEPA Environmental checklist (WAC 197-11-960) July 2016 Page 2 of 20 2. Name of applicant: Unico Longacres South Building LLC, Unico Longacres South Campus Land LLC, Unico Longacres Central Drainage LLC 3. Address and phone number of applicant and contact person: Unico Properties 1215 4th Ave, Suite 600 Seattle WA. 98161 (206) 628-5050 Julia Reeve juliar@unicoprop.com Alec Nelson anelson@unicoprop.com 4. Date checklist prepared: August 23, 2022 5. Agency requesting checklist: City of Renton WA 6. Proposed timing or schedule (including phasing, if applicable): Start of Field Construction in 2022. Completion of Work in December 2023. Occupancy January 2024 7. Do you have any plans for future additions, expansion, or further activity related to or connected with this proposal? If yes, explain. The Sounders FC Center at Longacres is a standalone project and is not dependent on any further development for the Longacres Campus. A master plan for the Longacres Campus is in the preliminary, conceptual design phase. 8. List any environmental information you know about that has been prepared, or will be prepared, directly related to this proposal. Survey by NV5 Arborist Report by American Forest Management Critical Areas – Existing Conditions Letter Report by Talasaea Consultants, Inc. Note: this report identifies and analyzes previous critical areas reports for the Longacres Campus. Longacres Unico Property (Seattle Sounders FC Performance Center) – Wetlands Peer Review by Otak. Critical Areas Report and Conceptual Mitigation Plan (including Biological & Habitat Assessment) by Talasaea Consultants, Inc. Drainage Report and Drainage Control Plan by CPL Geotechnical Report by Geoengineers SEPA Environmental checklist (WAC 197-11-960) July 2016 Page 3 of 20 Soil Report for Boeing CCRs by Aspect Consulting Transportation and Parking Memo by TenW Previous environmental review for Longacres includes: Draft Environmental Impact Statement, Longaces 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 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. None pending. 10. List any government approvals or permits that will be needed for your proposal, if known. City of Renton Conditional Use Permit (Hearing Examiner), Building Permit, Grade and Clearing Permit, Critical Areas Review, Site Plan Review including fence standard variation, 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 those answers on this page. (Lead agencies may modify this form to include additional specific information on project description.) The project name is the Sounders FC Center at Longacres . The project location is proposed for the Longacres Office Park (LOP) in Renton, Washington. Within the LOP, the Sounders “Site” comprises lots 11, 12, 13, 14, and Tract B, of that certain Boeing Longacres Property Second Amended Binding Site Plan, recorded at King County Recording No. 20050504000673, City of Renton, King County, WA, (the “BSP”), plus a portion of office building 25-20 located on lot 22 of the BSP, and a players’ secure parking area and use of shared parking facilities on lot 21 of the BSP. Minor adjustments to certain lot boundaries SEPA Environmental checklist (WAC 197-11-960) July 2016 Page 4 of 20 will be made by lot boundary adjustment to better conform to the field configuration. The address of existing building 25-20 is 1901 Oakesdale Avenue SW. The Site overall is approximately 1,320,419SF (30.0 Acres). The Sounders will use only a portion of Office Building 25-20 and its shared parking. The Site is bordered to the west by Tract A and southwest by Lot 8 of the BSP. The Site is bordered to the east by Oakesdale Avenue SW. Access to the Site is from Oakesdale. Office building 25-20 is approximately 288,044 NSF (311,982 GSF), and the Sounders will lease approximately 50,000 sf indoors on floors 1 and 2. A new accessory viewing deck proposed to overlook Field 1 from floor 2 will be approximately 1,650 sf in size. Some existing surface parking will be removed for the placement of Field 1 and 2 and additional parking will be removed to create a secure 1st team parking area in the existing southern parking field. A maintenance building (approximately 4,000 sf) and future field restroom (approximately 800 sf) are proposed to be co-located between fields 2 and 4. The area for the outdoor recreation facilities including the 4-5 fields and support area will require 645,165 SF (14.81 acres) of disturbed area. The work inside the building will involve TI work to convert portions of two floors of the building to the Sounders Headquarters and training facility. The addition of the fields and enclosure of a secured parking area will require the removal of 163 parking stalls. Please refer to the Transportation and Parking Memo from Ten W submitted with this Checklist. 12. Location of the proposal. Give sufficient information for a person to understand the precise location of your proposed project, including a street address, if any, and section, township, and range, if known. If a proposal would occur over a range of area, provide the range or boundaries of the site(s). Provide a legal description, site plan, vicinity map, and topographic map, if reasonably available. While you should submit any plans required by the agency, you are not required to duplicate maps or detailed plans submitted with any permit applications related to this checklist. The Location address is 1901 Oaksdale Avenue SW Renton WA 98057. The Location is a part of the approximately 158-acre Longacres Office Park in Renton, Washington (the latter also sometimes referred to as the Longacres Campus). The applicable lots for the project are Lot 11, Lot 12, Lot 13, Lot 14, Lot 21, Lot 22 and Tract B which are part of PARCEL A: TRACT 1, which is legally described as follows: LOTS 1,2,3,4,5,6,7,8,11,12,13,14,17,20,21,22,23,24,25 AND 26 AND TRACTS A, B, AND E OF BOEING LONGACRES PROPERTY BINDING SITE PLAN, ACCORDING TO THE PLAT RECORDED IN VOLUME 212 OF PLATS AT PAGES 63 THROUGH 69 AND AMENDED IN VOLUME 219 OF PLATS AT PAGES 67 THROUGH 73 AND IN VOLUME 228 OF PLATS AT PAGES 22 THROUGH 28, IN KING COUNTY, WASHINGTON, (AS SUCH BINDING SITE PLAN MAY BE SUBSEQUENTLY AMENDED BY LOT BOUNDARY ADJUSTMENT). EXCEPT THAT PORTION OF LOTS 4, 5 AND 7 CONVEYED TO CENTRAL PUGET SOUND REGIONAL TRANSIT AUTHORITY BY DEED RECORDED UNDER RECORDING NO. 2013080102216; AND EXCEPT THAT PORTION OF LOTS 1, 2, 3, 4 AND 7 CONVEYED TO BNSF RAILWAY COMPANY AND BN LEASING CORPORATION BY DEED RECORDED UNDER RECORDING NO. 20131206001379. B. Environmental Elements [HELP] 1. Earth [help] a. General description of the site: SEPA Environmental checklist (WAC 197-11-960) July 2016 Page 5 of 20 (circle 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 if 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 soils on the site consist of shallow fill overlying alluvial deposits, beach deposits and glacially consolidated soils. The fill generally consists of very soft to stiff silt and to medium silty sand with varying amounts of gravel. Fill in the vicinity of the site ranged to approximately 6 feet thick. Subsurface soils are anticipated to consist of surficial fill from past grading activities overlying recent alluvial deposits. The fill generally consists of very soft to stiff silt and loose to medium dense sand with varying amounts of silt and gravel and ranged up to approximately 6 feet thick. The alluvial deposits generally consist of loose to medium dense sands and gravels with varying amounts of silt and very soft to medium stiff silt. The sand and silty deposits are generally interbedded with lenses of soft to medium stiff organic silt. The alluvial deposits in the vicinity of the site range up to approximately 45 feet deep. See Geotechnical Report for Longarces Field Entitlement by GeoEngineers for additional information. d. Are there surface indications or history of unstable soils in the immediate vicinity? If so, describe. No Unstable soils. See Geotechnical Report for Longacres Field Entitlement by GeoEngineers 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 Excavation of the existing soils will be approximately 4,185 CY, with imported fill of approximately 26,588 CY. All excavated soils will be deposited at approved and permitted fill locations, and all source materials will be from an approved and permitted borrow site, with soils conforming to City of Renton and other applicable agency specifications. Fill soils will be mineral soils with the exception of topsoil used for the planted portions of the affected area. f. Could erosion occur as a result 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 Geotechnical Report for Longacres by GeoEngineers for additional information. g. About what percent of the site will be covered with impervious surfaces after project construction (for example, asphalt or buildings)? Proposed impervious surface 28,052 SF (0.64) in addition to the existing impervious surface is a total of 65,295 SF of the 1,320,419 SF of the Site which is 5% of the Site. See Site Plan for lot coverage breakdown. SEPA Environmental checklist (WAC 197-11-960) July 2016 Page 6 of 20 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 activities and monitoring will be provided as required by the State and City. See ESC Standard plan notes included on Civil General Notes Page for additional information. 2. Air [help] 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 vehicles during construction. Emissions from maintenance carts during operation when the project is complete. Painting will occur on the site for the new parking stall stripes and new paving for the secure parking area. There will be soil removal and adding of soil during the construction process of the fields which will create dust when there is excavation, grading and filling. The natural grass fields will use industry standard chemical nutrients including granular and liquid nitrogen and potassium as well as supplemental micronutrients in commercial packaging, Generally, storage on site is limited to what might be used in a 5-day application period. 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 air, if any: Standard measures will be put in place to reduce and control emissions. Temporary controls during construction will include wheel wash stations, clean crushed rock construction entrances, street sweeping, and existing impervious surface parking lots for loading will be used to minimize dust and maintain clean roadways. 3. Water [help] a. Surface Water: [help] 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 Sounders Site borders Wetland A and Storm Pond B. Within the vicinity of the Site are Spring Brook Creek (approximately 1,100 feet distant and across Oakesdale Avenue SW from the Sounders Site), Wetland C and Wetland F. See Critical Areas – Existing Conditions Letter Report by Talasaea Consultants for full details. 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, the proposed work will occur within 200 feet of Wetland A. See attached Grading Plan, Site Plan for additional information. Some site work may occur within 200 feet of Wetland F. Invasive species SEPA Environmental checklist (WAC 197-11-960) July 2016 Page 7 of 20 observed during the 5-year establishment period will be manually removed as encountered. See Critical Areas and Conceptual Mitigation Plan by Talasaea Consultants for more details. 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. No fill or dredge material to or from surface water or wetlands. There are 3 french drains that will be directed to Storm Pond B. See Grading and drainage plans for additional details. 4) Will the proposal require surface water withdrawals or diversions? Give general description, purpose, and approximate quantities if known. No. The proposal does not require surface water withdrawals or diversions. 5) Does the proposal lie within a 100-year floodplain? If so, note location on the site plan. Yes. The proposal lies within a 100-year floodplain. See Site Plan. 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. Only a minimal, permitted discharge from the small maintenance out-building to Storm Pond B is proposed. Within the field complex in the southern half, a maintenance out-building will be erected, and will include a permitted wash-out-area for equipment. The out-building will house field maintenance equipment (e.g. mowers, aerators, hoses, rollers, etc.) and will be erected on a concrete foundation and slab-on-grade structure. An equipment washdown pad will be provided with water quality vault for oil containment and water treatment consistent with Storm Drainage requirements. This treated runoff will be conveyed to Storm Pond B. b. Ground Water: [help] 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 general description, purpose, and approximate quantities if known. The proposal does not include a well for groundwater use. The ground water 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 vicinity 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 (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. No waste materials are planned to be discharged into the ground. SEPA Environmental checklist (WAC 197-11-960) July 2016 Page 8 of 20 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 the on-site conveyance system beneath and adjacent to the sports fields. The runoff collected will be treated for Enhanced Basic requirements and discharged into existing Storm Pond B on the developed Longacres Campus. The adjacent existing parking lot will continue to discharge to this same Storm Pond as it does currently. Prior to construction, the civil engineer will prepare a Temporary Erosion and Sediment Control Plan (TESCP) and 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 through the appropriate location of the maintenance facility on a solid concrete surface, with all runoff from this area as well as the fields themselves, captured and routed through the water quality Enhanced Basic stormwater treatment vault 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 Stormwater Management Plan and Drainage Report prepared by CPL. 4. Plants [help] a. Check the types of vegetation found on the site: _x___deciduous tree: alder, maple, aspen, other _x__evergreen tree: fir, cedar, pine, other _x___shrubs _x___grass ____pasture ____crop or grain ___ Orchards, vineyards or other permanent crops. _x___ wet soil plants: cattail, buttercup, bullrush, skunk cabbage, other _x___water plants: water lily, eelgrass, milfoil, other _x___other types of vegetation b. What kind and amount of vegetation will be removed or altered? SEPA Environmental checklist (WAC 197-11-960) July 2016 Page 9 of 20 The field area and a perimeter construction zone will be cleared and graded, approximately 14 acres. Construction access to the field areas will be from the East. Some lot area extending beyond the field perimeters may be disturbed during construction; any disturbed areas outside the field complex will be revegetated according to an approved plan. See arborist report by AFM for tree inventory. Imported soils and organic amendments will be supplied by firms certified in compliance with WAC 173-350-220 Composting Facilities. Plant materials will be supplied by firms licensed pursuant to Ch. 15.13 RCW. c. List threatened and endangered species known to be on or near the site. See Critical Areas and Conceptual Mitigation Plan dated October 7, 2022 prepared by Talasaea Consultants Inc. The Report includes a Biological and Habitat Assessment at Ch. 4. The Biological and Habitat Assessment identifies five ESA-listed or candidate species potentially within the Project-affected areas. This report concludes that the construction and operation of the Sounders facilities will not directly affect any ESA-listed or candidate species and will not result in a “take” as defined by the Endangered Species Act. d. Proposed landscaping, use of native plants, or other measures to preserve or enhance vegetation on the site, if any: A Landscape Plan will be prepared by DA Hogan. A wetland buffer restoration plan is identified in the Critical Areas and Conceptual Mitigation Plan dated October 7, 2022. The plans include measures to comply applicable local development regulations. For additional information, see the Detailed Landscaping Plan submitted with this proposal. e. List all noxious weeds and invasive species known to be on or near the site. Throughout the site there is prevalence of non-native and invasive Himalayan blackberry (Rubus armeniacus), reed canary grass (Phalaris arundinacea), and English Ivy (Hedera helix). See Critical Areas and Conceptual Mitigation Plan by Talasaea Consultants for full details. 5. Animals [help] a. List any birds and other animals which have been observed on or near the site or are known to be on or near the site. Amphibians: Frogs Birds: Duck, Geese, Herons, Songbirds, Other Mammals: Coyote, Rabbits, Squirrels, Deer, Beaver, Racoon, Moles Fish: Trout, Other Reptiles: Turtles, Other See Critical Areas and Conceptual Mitigation Plan dated October 7, 2022 prepared by Talasaea Consultants Inc. Examples include: birds: hawk, heron, eagle, songbirds, other: 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. SEPA Environmental checklist (WAC 197-11-960) July 2016 Page 10 of 20 This checklist is supported by a Biological and Habitat Assessment included in the Critical Areas Report and Conceptual Mitigation Plan prepared by Talasaea Consultants, Inc. dated October 7, 2022. Talasaea Consultants used the IPaC web application provided by USFWS, which compiles a species list of ESA-listed or candidate terrestrial and freshwater species that are potentially within a Project-affected area, or may be affected by a proposed action. Application of the IPaC to the Project Site identified Five ESA-listed or candidate species are potentially within the Project-affected area, or may be affected by the proposed action: Marbled Murrelet, Streaked Horned Lark, Western Yellow-billed Cuckoo, Bull Trout and Monarch Butterfly. However, based on Site-specific investigation and analysis of habitat requirements, all terrestrial species listed are not within the Project-affected area, nor have designated critical habitat within the Project-affected area. The Monarch Butterfly is a candidate species not requiring consultation under ESA. Two ESA-listed Pacific salmon species have designated critical habitat outside the Project Site, at Springbrook Creek (70 FR 52629; 81 FR 9251): Puget Sound Chinook and Puget Sound Steelhead. Springbrook Creek is approximately 1,150 feet from the Sounders facilities. Talasaea’s Biological and Habitat Assessment concluded: “that the construction and operation of the Sounders facilities will not directly affect any ESA-listed or candidate species and will not result in a “take” as defined by the Endangered Species Act.” Executive Summary, p. ii. See Critical Areas and Conceptual Mitigation Plan by Talasaea Consultants for full details and information of the effects analysis for ESA-listed species and their critical habitat. c. Is the site part of a migration route? If so, explain. There is a final designated critical habitat for Puget Sound Chinook and Puget Sound Steelhead within the Project-affected area, Springbrook Creek (70 FR 52629; 81 FR 9251). See Critical Areas Report and Conceptual Mitigation Plan by Talasaea Consultants for full details. d. Proposed measures to preserve or enhance wildlife, if any: Habitat restoration in the wetland buffer will include native plantings and removal of invasive plants. In accordance with the NPDES, a Construction Stormwater Permit will be required for the Project. The Contractor will also develop a stormwater pollution prevention plan that details stormwater management during construction. Permanent Stormwater mitigation site plan will be developed that meets the City of Renton drainage requirements. It will also include floodplain mitigation measures as required by the 2022 Renton Surface Water Design Manual. See the Critical Areas Report and Conceptual Mitigation Plan by Talasaea Consultants for full details. e. List any invasive animal species known to be on or near the site. None known. 6. Energy and Natural Resources [help] 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. The project proposes to use electricity and natural gas energy sources to support tenant MEPF systems. b. Would your project affect the potential use of solar energy by adjacent properties? If so, generally describe. SEPA Environmental checklist (WAC 197-11-960) July 2016 Page 11 of 20 The proposal does not cast any significant shadows. Thus, it will not affect the potential use of solar energy by adjacent properties. 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: Tenant Improvements will include occupancy sensors to ensure lights are only utilized when needed. LED lighting will be used throughout the Applicant’s premises. 7. Environmental Health [help] 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. 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. Proposal: As related to this proposal, the assessments did not identify any contamination where the Sounders are proposing new improvements (e.g., soccer fields, goalkeeper training areas, maintenance shed, landscaping improvements, etc). Potential contamination was found adjacent to the current location of Building 25-20, which was remediated through the activities discussed above. In addition, all construction activities will be subject to a construction mitigation plan and BMPs. The Sounders are also completing supplemental soil management plans as identified in the Unico-Boeing CCRs, which exceed any obligations required under federal, state, or local regulations. 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 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. SEPA Environmental checklist (WAC 197-11-960) July 2016 Page 12 of 20 Fuel for equipment will be used and may be stored on site, subject to proper spill control measures per Dept. of Ecology requirements. There will be refilling of vehicles on site in amounts greater than 20 gallons. Refueling of equipment will be from mobile tank trunks. Portable secondary containment equipment will be used during mobile refueling. The containment equipment will be positioned to catch any fuel spills due to overfilling of equipment and any other spills that may occur at or near the fuel filler port to that equipment.. The applicant does not anticipate other toxic or hazardous chemicals being used, stored or produced on site during construction or operation. Nonetheless, if the need arises, then such materials would be handled in accordance with applicable regulations. 4) Describe special emergency services that might be required. None required. 5) Proposed measures to reduce or control environmental health hazards, if any: 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)? Indi- cate what hours noise would come from the site. Noise Impacts during construction could include typical heavy machinery and vehicles. Augur cast pile drilling rigs and associated batch plant concrete delivery trucks. During operation, human voices from the outdoor recreation fields will be a noise source. Amplified sound (music) will be used during training and at special events where on-site audiences are present. Noise would correspond to hours of field use, which generally would not exceed the hours of 8:00 am to 9:00 pm and typically is not continuous throughout the day. Hours of field use could vary during special events. 3) Proposed measures to reduce or control noise impacts, if any: A construction mitigation plan that includes reasonable measures to address noise impacts has been prepared. Please see attached Preliminary Construction Mitigation Plan prepared by Venture General Contracting. Noise impacts from Sounders FC operations 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 generated by training and events is not anticipated to affect, burden or create a nuisance to any other property owner or user. 8. Land and Shoreline Use [help] 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. 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 and indoor and outdoor recreational facilities. The SEPA Environmental checklist (WAC 197-11-960) July 2016 Page 13 of 20 proposal is not expected to affect current land uses on nearby or adjacent properties as further described in the CUP Approval Criteria response. 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 as a result 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. Building 25-20, Unico Longarces South Building (Formerly Boeing’s South Building) is on the Site and will remain. The building is a 5-story, approximately 288,044 NSF, (311,982 GSF) and the Sounders will lease approximately 50,000 sf indoors on floors 1 and 2. The existing use for the building is Office Space, formerly used as Boeing’s offices. Additional facilities exist on the Site, including a surface parking lot, utilities, and existing stormwater infrastructure. d. Will any structures be demolished? If so, what? No Structures will be demolished. A portion of an existing surface parking lot will be converted to a soccer playing field. e. What is the current zoning classification of the site? CO – Commercial Office is the current zoning classification of the site. Recreational facilities, outdoor, are allowed in CO zone by conditional use permit. Office use, recreational facilities, indoor, new are permitted uses in the CO zone. Indoor recreational uses are limited to 25% of the building gsf. The Sounders’ indoor recreational use will not exceed 25% of the gsf of building 25-20. f. What is the current comprehensive plan designation of the site? The Comprehensive Plan Land Use Designation for the Site is Employment Area (“EA”) g. If applicable, what is the current shoreline master program designation of the site? The Site is not within the Shoreline jurisdiction for the City of Renton. h. Has any part of the site been classified as a critical area by the city or county? If so, specify. Yes. Wetland A is a critical area; the Wetland A buffer extends onto the Site. See Critical Areas Report and Conceptual Mitigation Plan dated October 7, 2022. The site also includes a seismic hazard area and flood hazard area. i. Approximately how many people would reside or work in the completed project? SEPA Environmental checklist (WAC 197-11-960) July 2016 Page 14 of 20 Sounders FC anticipates 239 employees will work in the completed project. j. Approximately how many people would the completed project displace? The completed project will displace no people. k. Proposed measures to avoid or reduce displacement impacts, if any: The completed project will displace no people. L. Proposed measures to ensure the proposal is compatible with existing and projected land uses and plans, if any: None. m. Proposed measures to reduce or control impacts to agricultural and forest lands of long-term commercial significance, if any: Not applicable 9. Housing [help] a. Approximately how many units would be provided, if any? Indicate whether high, mid- dle, or low-income housing. No Units are provided in this proposal. b. Approximately how many units, if any, would be eliminated? Indicate whether high, middle, or low-income housing. No Units are eliminated in this proposal. c. Proposed measures to reduce or control housing impacts, if any: NA, no Units are eliminated or provided in this proposal. 10. Aesthetics [help] a. What is the tallest height of any proposed structure(s), not including antennas; what is the principal exterior building material(s) proposed? The height of the existing 5-story Building 25-20 is 93’8”. No change to the height of building 25-20 is proposed. The height of the proposed maintenance shed is 15’. Perimeter fence height is 10’ and will include wind/privacy screening. In some locations ball control netting, 15’ in height, will be installed on the fence, bringing the total fence + netting height to 25’. The height of the field lighting poles will be 70’. b. What views in the immediate vicinity would be altered or obstructed? None. The only views are internal to the site from Building 25-20. The views from the lower level of Building 25-20 will be altered by a 10’ tall fence, privacy screen and ball control netting. The light posts will also minimally change the view from Building 25-20 to the West. Views from the Longacres Campus trails will be altered by the fence and ball control netting in some sections when looking to the East. c. Proposed measures to reduce or control aesthetic impacts, if any: Sounders FC Center at Longacres will be an attractive state of the art headquarters and Major League Soccer training center. Sounders FC tenant improvements to and use of Building 25-20 will activate and emphasize the soaring glass atrium and add an outdoor viewing platform overlooking the fields. Field design and construction will showcase MLS field standards and be maintained in professional condition year-round. Landscape design and planting themes will create a cohesive feel for the Sounders FC Center at Longacres, transitioning into the native vegetation at the wetland buffer and stormwater pond SEPA Environmental checklist (WAC 197-11-960) July 2016 Page 15 of 20 edges at the perimeter. Disturbed areas outside the perimeter fence will be replanted, monitored, and irrigated as necessary to assure successful plant establishment. The fencing, screen, ball control netting are to meet the minimum requirements for FIFA. The ball control netting is behind the goals and critical edges to prevent the balls from leaving the field complex. The design meets the requirements for FIFA and minimizes view obstructions to the extent it is possible. 11. Light and Glare [help] a. What type of light or glare will the proposal produce? What time of day would it mainly occur? Within the field complex, light poles will be erected, containing directional LED lights designed specifically to light fields after dark but directed solely at the fields and preventing light pollution outside of the field complex. See Light specification sheet for additional detail. b. Could light or glare from the finished project be a safety hazard or interfere with views? No. The directional LED lights are designed to focus light onto the fields and not into adjacent areas or habitat area. See light plan and light specifications sheet for additional details. c. What existing off-site sources of light or glare may affect your proposal? No off-site sources of light will affect proposal. d. Proposed measures to reduce or control light and glare impacts, if any: Field lighting will be directed downward onto fields, as addressed above. Use of field lights is generally restricted to when it is needed for visibility during evening training sessions, or possibly off -hours maintenance activities. Evening training most frequently occurs on turf fields (which are the furthest from Wetland A) for the MLS Next Academy Team. These sessions typically run from 4:00 - 9:00 pm, so the duration of lighting depends upon the time of year. For example, a winter training session may require 5 hours of lighting, where a summer session might not require any. Occasionally, lighting may be used during special events on any field. 12. Recreation [help] 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 the 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 will not displace existing recreational uses. The project proposes minor modification to the existing pathways on the site. The path that currently connects from the West side of the Property to Building 25-20 will be removed and new path will be created at the North edge of the fields to access Building 25-20. See Site Plan for additional details. SEPA Environmental checklist (WAC 197-11-960) July 2016 Page 16 of 20 c. Proposed measures to reduce or control impacts on recreation, including recreation opportunities to be provided by the project or applicant, if any: Existing pathways along the edge of Wetland A and Storm Pond B will be retained, with minor route adjustments in a few locations to allow for needed site work. Sounders FC Center at Longacres will continue the Sounders FC youth soccer programs, especially using Fields 4 and 5 for youth programs. Youth camps typically operate during school year breaks (e.g. spring and summer breaks) and typically operate between 9:00 am and 4:00 pm during those windows (about 10 weeks per year). Youth programs may also operate as after-school weekly clinics or classes (4:00 pm to 8:00 pm). Youth programs are operated both as a pay-to-participate, and for free, throughout the year. 13. Historic and cultural preservation [help] 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 sites located on or near the Site are listed on or eligible for listing in the national or state preservation registers. 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 SEPA Environmental checklist (WAC 197-11-960) July 2016 Page 17 of 20 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 the City of Renton, DAHP, and the Muckleshoot Indian Tribe if any potential archeological evidence is encountered during site work. 14. Transportation [help] 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. The Site is accessed by Oakesdale Ave SW. 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 within approximately 500’ of the site. c. How many additional parking spaces would the completed project or non-project proposal have? How many would the project or proposal eliminate? The existing surface parking for Building 25-20 is 929 stalls. The proposal will remove 163 stalls leaving a net total of 766 stalls. The proposed parking satisfies the proposal’s parking demand. See Site Plan and TenW Traffic Memo for additional details d. 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). No. No impacts from the project would require transportation improvements. Oakesdale Ave SW is classified as a Principal Arterial street with an existing right-of-way (ROW) width of approximately 90 feet. Oakesdale Ave SW has five lanes (two vehicular lanes and a turn lane), a separated bike paths running north and south, curbs, and sidewalks running north and south. The Longacres Campus includes existing pathways, trails, and interior roadways. The applicant has submitted a street improvement modification/exemption request pursuant to RMC 4-9-2.50.D and 4-6-060.e and f explaining how these facilities adequately meet this proposal’s transportation demands. Under the modification/exemption, the existing conditions will continue provide multimodal transportation to and through the project Site. These existing facilities adequately address all of the proposal’s transportation impacts and needs. Additional transportation related information is available in the TENW Parking Analysis Memorandum dated August 8, 2022 and the TENW Trip Generation Memo dated June 27, 2022. e. 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 25-20, which links to the Tukwila Transit Center, and Burien Transit Center, and the Landing. SEPA Environmental checklist (WAC 197-11-960) July 2016 Page 18 of 20 f. How 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? The completed proposal will generate 147 net new weekday daily trips, and 14 net new weekday pm peak hour vehicular trips per day. See the TenW Traffic Memo for additional details. g. 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 h. Proposed measures to reduce or control transportation impacts, if any: None. Due to the limited number of additional trips the impacts are minimal and no measures are proposed. 15. Public Services [help] 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. The existing site was the Boeing Headquarters. Additional Public Services are not anticipated. b. Proposed measures to reduce or control direct impacts on public services, if any. Providing On-Site Security. Any impacts required by the City will be paid for by the project. 16. Utilities [help] 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 re-use of an existing office building in an urban area, so the Site is presently served by sewer, water, road improvements, electrical, etc. Existing off-site improvements are not planned to be re-constructed, except in the event that code compliance requires an existing non-conforming improvement to be brought up to current standards. Existing sewer, water and electrical services will need to be extended into the area of the Site proposed for the development of soccer fields and supporting facilities. A new fire hydrant and water meter are proposed near the Maintenance Building, along with a new sewer line extending from that same building out to the existing main in Oakesdale. Additional Fire Hydrants would be installed if required by the change of use building 25-20. C. Signature [HELP] 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: ___________________________________________________ SEPA Environmental checklist (WAC 197-11-960) July 2016 Page 19 of 20 Name of signee __Julia Reeve_________________________________________ Position and Agency/Organization Development Manager/Unico Properties_________ Date Submitted: October 10, 2022_____________ D. Supplemental sheet for nonproject actions [HELP] (IT IS NOT NECESSARY to use this sheet for project actions) Because these questions are very general, it may be helpful to read them in conjunction with the list of the elements of the environment. When answering these questions, be aware of the extent the proposal, or the types of activities likely to result from the proposal, would affect the item at a greater intensity or at a faster rate than if the proposal were not implemented. Respond briefly and in general terms. 1. How would the proposal be likely to increase discharge to water; emissions to air; pro- duction, 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: 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: SEPA Environmental checklist (WAC 197-11-960) July 2016 Page 20 of 20 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.