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HomeMy WebLinkAboutECF_Bldg Demo Environmental Checklist 8-27-25SEPA Environmental checklist August 2025 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 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. 1 https://ecology.wa.gov/Regulations-Permits/SEPA/Environmental-review/SEPA-guidance/Checklist-guidance SEPA Environmental checklist August 2025 Page 2 (WAC 197-11-960) A.Background Find help answering background questions2 1.Name of proposed project, if applicable: Southeast Building Demolition Project 2.Name of applicant: City of Renton (Renton Municipal Airport) 3.Address and phone number of applicant and contact person: William Adams 243 West Perimeter Road Renton, WA 98057 206-775-6862 4.Date checklist prepared: August 7, 2025 5.Agency requesting checklist: City of Renton 6.Proposed timing of schedule (including phasing, if applicable): The demolition project will be completed in 2026. 7.Do you have any plans for future additions, expansion, or further activity related to or connected with this proposal? If yes, explain. Yes, the property will be developed by a new airport tenant. It is anticipated that the new airport tenant will redevelop within the next five years, although no proposals have been requested or agreements are in place at this time, so it may be longer than five years before it is redeveloped. The tenant will be an airport use tenant, but the specific use is not known at this time. A separate SEPA application and necessary documentation will be submitted for that project when it starts. 8.List any environmental information you know about that has been prepared, or will be prepared, directly related to this proposal. ·USGS National Map – FEMA Flood Hazard Study ·COR Maps -- City of Renton o Aquifer Recharge Area Study §https://www.randycorman.com/wp- content/uploads/2025/02/Renton-1984-Aquifer-study.pdf o Seismic Hazard Map Study+ 2 https://ecology.wa.gov/Regulations-Permits/SEPA/Environmental-review/SEPA-guidance/SEPA-checklist- guidance/SEPA-Checklist-Section-A-Background National Flood Hazard Layer FIRMette 0 500 1,000 1,500 2,000250 Feet Ü SEE FIS REPORT FOR DETAILED LEGEND AND INDEX MAP FOR FIRM PANEL LAYOUT SPECIAL FLOODHAZARD AREAS Without Base Flood Elevation (BFE)Zone A, V, A99With BFE or Depth Zone AE, AO, AH, VE, AR Regulatory Floodway 0.2% Annual Chance Flood Hazard, Areasof 1% annual chance flood with averagedepth less than one foot or with drainageareas of less than one square mile Zone X Future Conditions 1% Annual Chance Flood Hazard Zone X Area with Reduced Flood Risk due to Levee. See Notes.Zone X Area with Flood Risk due to LeveeZone D NO SCREEN Area of Minimal Flood Hazard Zone X Area of Undetermined Flood Hazard Zone D Channel, Culvert, or Storm Sewer Levee, Dike, or Floodwall Cross Sections with 1% Annual Chance 17.5 Water Surface Elevation Coastal Transect Coastal Transect Baseline Profile Baseline Hydrographic Feature Base Flood Elevation Line (BFE) Effective LOMRs Limit of Study Jurisdiction Boundary Digital Data Available No Digital Data Available Unmapped This map complies with FEMA's standards for the use of digital flood maps if it is not void as described below.The basemap shown complies with FEMA's basemapaccuracy standards The flood hazard information is derived directly from theauthoritative NFHL web services provided by FEMA. This mapwas exported on 6/5/2025 at 5:39 PM and does notreflect changes or amendments subsequent to this date andtime. The NFHL and effective information may change orbecome superseded by new data over time. This map image is void if the one or more of the following map elements do not appear: basemap imagery, flood zone labels, legend, scale bar, map creation date, community identifiers, FIRM panel number, and FIRM effective date. Map images for unmapped and unmodernized areas cannot be used for regulatory purposes. Legend OTHER AREAS OF FLOOD HAZARD OTHER AREAS GENERAL STRUCTURES OTHER FEATURES MAP PANELS 8 B 20.2 The pin displayed on the map is an approximatepoint selected by the user and does not representan authoritative property location. 1:6,000 122°13'1"W 47°29'20"N 122°12'24"W 47°28'56"N Basemap Imagery Source: USGS National Map 2023 18,056 1,505 Map Title Legend 1,0230512 Feet Notes 1,023 WGS_1984_Web_Mercator_Auxiliary_Sphere All data, information, and maps are provided "as is" without warranty or any representation of accuracy, timeliness of completeness. The burden for determining accuracy, completeness, timeliness, merchantability and fitness for or the appropriateness for use rests solely on the user. City and County Labels City and County Boundary Renton <all other values> Wellhead Protection Area Zones Zone 1 Zone 1 Modified Zone 2 Streams (Classified) S - Shoreline F - Fish Np - Non-Fish Ns - Non-Fish Seasonal Unclassfied Wetlands Streets Waterbodies 2023.sid Red: Band_1 Green: Band_2 Blue: Band_3 AQUIFER RECHARGE AREA SEPA Environmental checklist August 2025 Page 5 (WAC 197-11-960) 9.Do you know whether applications are pending for governmental approvals of other proposals directly affecting the property covered by your proposal? If yes, explain. None. 10.List any government approvals or permits that will be needed for your proposal, if known. §City of Renton Stormwater Permit §ESC Plans and SWPPS Report is required by the City of Renton. §NPDES Permit is not needed if the project is less than a 1-acre site §City of Renton Demolition Permit 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 Southeast Building Demolition Project includes: §Demolition of: ú Building 295 (11,047 sf) – This building is an unoccupied building which’s primary purpose was for The Boeing Company’s as an aircraft parts development facility. A former air traffic control tower (ATCT) cab was added to the building at a later date. ú Building 330 (6,615 sf) – This building is an open shed structure that was built as an aircraft hangar but was repurposed by the Renton airport and used for the storage of snow removal equipment and other equipment. It is open on two sides, wood construction, and one story. ú Building 350 (11,708 sf) – This building is a hangar with supporting rooms. The building is currently unoccupied. It is wood frames with glue-lam beams in the hangar portion to support the roof. §Demolition of buildings will stop at the existing building foundation and foundations will be left in place until future development projects remove them. Existing utilities will be capped at existing building demolition limits. The project site consists of three existing buildings inside the AOA. Their uses are for aviation including a hangar, storage shed, and an office building. After demolition, the site will remain unused until a future airport tenant develops the site into a new aviation related use. The buildings are surrounded by airfield pavement and grass. The paved areas are used for parking, and aircraft movement. All work will occur within the airport built environment, and there will be no increase to the total area of impervious surface after the demolition. The project area encompasses three SEPA Environmental checklist August 2025 Page 6 (WAC 197-11-960) buildings to be demolished and the capping of utilities at building limits, see Figure 1 for project area limits. R MBX KEYPLAN SCALES ACCORDINGLY. THIS SHEET, ADJUST IF NOT ONE INCH ON 0" 1" ORIGINAL DRAWING. BAR IS ONE INCH ON VERIFY SCALES APPRBYNO.DATE REVISIONS SHEET NO. DRAWING NO. DATE:PROJECT NO:SCALE: CHECKED BY: DRAWN BY: DESIGNED BY: RENTON MUNICIPAL AIRPORT SOUTHEAST BUILDING DEMOLITION PROJECT Pl o t t e d B y : St a n e k , M i c h a e l S h e e t S e t : RN T _ T A X I W A Y A R E H A B L a y o u t : Sit e P l a n E x h i b i t Au g u s t 0 4 , 2 0 2 5 0 4 : 5 7 : 4 8 p m K: \ S E A _ P u b l i c S e c t o r \ 0 9 0 2 3 5 0 0 0 - R N T - S E B l d g D e m o P r o j e c t \ 0 8 C A D D \ E x h i b i t s \ S E P A S i t e O v e r v i e w . d w g © 2025 KIMLEY-HORN AND ASSOCIATES, INC. WWW.KIMLEY-HORN.COM PHONE: 206-607-2600 1201 THIRD AVENUE, SUITE 2800, SEATTLE, WA 98101 ------------ FEBRUARY 2025 090235000.3 1" = 50' DSW ZEV MS SITE PLAN EXHIBIT 1 1 NORTH BUILDING TO BE DEMOLISHED LEGEND PROJECT AREA BUILDING FOOTPRINT BUILDING 295: 11,047 SF BUILDING 330: 6,616 SF BUILDING 350: 11,708 SF SEPA Environmental checklist August 2025 Page 8 (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 required by the agency, you are not required to duplicate maps or detailed plans submitted with any permit applications related to this checklist. The Renton Municipal Airport is located at 243 W Perimeter Rd in Renton, Washington. Tax Parcel 0723059007. The site is located in a portion of the NE Quarter of Section 18, Township 23 Range 5 East. Buildings 295, 330, and 350 are located in the SE corner of the Renton Airport, just north of E. Perimeter Road and West of the Ace Aviation building and South of the Boeing Facilities. The buildings are near the existing AOA fence on the edge of the airport property. A Boeing property is to the north. The city of Renton Airport Road is located on the south. A taxilane to the Ace Aviation building goes between Buildings 350 and 330. The site is almost completely paved and in total encompasses 29,371 sf of buildings to be demolished. B.Environmental Elements 1.Earth Find help answering earth questions3 a.General description of the site: The majority of the site consists of existing developments that support aircraft operations, including the former Boeing Building (Building 295), a former T-hangar (Building 330), and a vacant tenant hangar (Building 350). The site is completely within airport property and bounded by the AOA fence. Outside the airport property, the airport is surrounded by the Boeing Parcel to the north, Cedar River to the east, E. Perimeter Road to the south, and Taxiway B to the west. The site is predominantly flat, paved with asphalt except for some minor landscaping, and situated approximately 20-30 feet above mean sea level. There is one tree on the south end of the site that will be removed as part of the project due to its proximity to the AOA fence. Circle or highlight one: Flat, rolling, hilly, steep slopes, mountainous, other: b.What is the steepest slope on the site (approximate percent slope)? No slopes over 3% 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. 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 August 2025 Page 9 (WAC 197-11-960) The soil is made of existing fill layers up to 4 feet deep made of loose to medium dense gravel with sand. The native material underneath is generally medium to stiff silt with organics. There are no agricultural land uses in the vicinity of the project site. d.Are there surface indications or history of unstable soils in the immediate vicinity? If so, describe. City of Renton Maps the entire site as a seismic hazard (COR Maps 2023). See Figure 2. 18,056 1,505 RENTON AIRPORT SEISMIC HAZARD MAP Legend 0 512 Notes 1,023 WGS_1984_Web_Mercator_Auxiliary_Sphere All data, information, and maps are provided "as is" without warranty or any representation of accuracy, timeliness of completeness. The burden for determining accuracy, completeness, timeliness, merchantability and fitness for or the appropriateness for use rests solely on the user. 1,023 Feet Environment Designations Natural Shoreline High Intensity Shoreline Isolated High Intensity Shoreline Residential Urban Conservancy Jurisdictions Streams (Classified) S - Shoreline F - Fish Np - Non-Fish Wetlands Seismic Hazard Areas Faults Streets 2023.sid Red: Band_1 Green: Band_2 Blue: Band_3 SEPA Environmental checklist August 2025 Page 11 (WAC 197-11-960) 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. There will be no fill or excavation planned for this project. f.Could erosion occur because of clearing, construction, or use? If so, generally describe. Soil erosion is not anticipated to occur as a result of clearing during construction. The project will not include grading; the tree to be removed will be cut at its stump. The project includes temporary erosion control elements to be placed prior to construction to prevent any erosion due to demolition activities. g.About what percent of the site will be covered with impervious surfaces after project construction (for example, asphalt or buildings)? No new pervious surfaces will be paved during this project. The existing impervious surface will remain undisturbed. h.Proposed measures to reduce or control erosion, or other impacts to the earth, if any. TESC measures will include, but not be limited to, storm inlet protection, and silt fencing in pervious areas. A Construction Stormwater Pollution Prevention Plan (CSWPP) will be prepared for this project per City of Renton permit requirements prior to construction and will consist of a written narrative using the Department of Ecology’s template. Additionally, erosion and sediment control (ESC) plans will be included in the contract documents. It will be the responsibility of the selected construction contractor to modify and complete the CSWPP based on the proposed construction approach and designate a Certified Erosion and Sediment Control Lead (CESCL) to monitor construction stormwater, as well as modify the CSWPP based on site conditions and construction activities. The contractor’s CESCL will ensure that site discharges are in accordance with the State of Washington Construction Stormwater General Permit. There is no disturbed impervious areas on the site. 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. During construction activities, there may be a small increase in exhaust emissions from construction vehicles and equipment, and a temporary increase in fugitive dust due to sediment removal. This increase in exhaust emissions and dust would be localized and temporary. No emissions into the air would result from the operation or maintenance of the project. 4 https://ecology.wa.gov/Regulations-Permits/SEPA/Environmental-review/SEPA-guidance/SEPA-checklist- guidance/SEPA-Checklist-Section-B-Environmental-elements/Environmental-elements-Air SEPA Environmental checklist August 2025 Page 12 (WAC 197-11-960) b.Are there any off-site sources of emissions or odor that may affect your proposal? If so, generally describe. There are no off-site sources of emissions or odors that would affect the proposed project. c.Proposed measures to reduce or control emissions or other impacts to air, if any: Measures that could be incorporated during construction to minimize impacts on air quality include: §The Contractor will spray exposed soil and storage areas with water during dry periods. §Remove particulate matter deposited on paved areas to reduce mud and dust; sweep and wash streets frequently to reduce dust. §Equip construction equipment with appropriate emission controls. §Comply with the Puget Sound Clean Air Agency (PSCAA) regulations to control odorous emissions as to prevent undue interference with nearby uses. 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 is near Lake Washington to the north and the Cedar River, which flows into Lake Washington, to the east. Both are shorelines of the state. According to the Statewide Washington Integrated Fish Distribution (SWIFD) online mapping, Cedar River is a fish-bearing stream that supports salmonids. According to the U.S. Fish and Wildlife Service’s (USFWS) National Wetland Inventory (NWI), no wetlands occur on site. 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. There will be no work over or in any waters. A portion of the Project will be constructed adjacent to the Cedar River with a distance of 300 feet or greater from the project site. 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 August 2025 Page 13 (WAC 197-11-960) 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 in-water work will occur as a part of the project. No fill and/or dredge material will be placed in or removed from wetlands or surface waters. 4. Will the proposal require surface water withdrawals or diversions? Give a general description, purpose, and approximate quantities if known. No surface water withdrawals or diversions are required for the proposed project. 5. Does the proposal lie within a 100-year floodplain? If so, note location on the site plan. No, the proposal does not lie within a 100-year floodplain. According to Federal Emergency Management Agency (FEMA) mapping, the Cedar River 100-year floodplain (1% chance of annual flood) and regulatory floodway is mostly contained within its leveed channel (Figure 2). No work is proposed in the floodplain or the floodway. 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. The proposed project will not involve the discharge of any waste materials to surface waters. 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. No groundwater would be withdrawn for drinking water or other purposes. 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 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 would be discharged into ground from septic tanks or other sources. 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. 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 August 2025 Page 14 (WAC 197-11-960) Stormwater will be the main source of runoff. However, a change in the amount of stormwater runoff, post-construction, is not anticipated as there are no changes in the area of impervious surfaces proposed by the project. 2.Could waste materials enter ground or surface waters? If so, generally describe. No waste materials would be discharged into the ground or surface waters as a result of the Project. 3. Does the proposal alter or otherwise affect drainage patterns in the vicinity of the site? If so, describe. The proposal will not affect or alter the existing drainage patterns within the vicinity of the site. d. Proposed measures to reduce or control surface, ground, and runoff water, and drainage pattern impacts, if any: No impacts to surface water, ground water, stormwater runoff, or drainage patterns will occur as a result of the project; therefore, no mitigation measures are required. 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 ☐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? A limited amount of grass and shrubs in addition to a single tree will be removed with this project. c. List threatened and endangered species known to be on or near the site. According to the Washington State Department of Natural Resources Washington Natural Heritage Program mapper, there are no known listed plant species on or near the Project site (WDNR 2024). The Project site is urban and does not provide suitable habitat for listed plants. SEPA Environmental checklist August 2025 Page 15 (WAC 197-11-960) d.Proposed landscaping, use of native plants, or other measures to preserve or enhance vegetation on the site, if any. No new landscaping is proposed. e. List all noxious weeds and invasive species known to be on or near the site. According to King County iMap, tansy ragwort (Jacobaea vulgaris), a Class B noxious weed, has been identified along E Perimeter Rd adjacent to the Cedar River near the southeastern portion of the airport (King County 2024). Other invasive species found onsite include Himalayan blackberry, reed canary grass, English ivy, holly (Ilex sp.), and Scotch broom (Cytisus scoparius). These species are found in dense patches along the shorelines of Lake Washington and the Cedar River. They are not located within the project site boundaries. 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. Animal species observed and/or known to be on site include: §Birds: mallard (Anas platyrhynchos), dark-eyed junco (Junco hyemalis), American coot (Fulica americana), common merganser (Mergus merganser), bufflehead (Bucephala albeola), northern flicker (Colaptes auratus), Canada goose (Branta canadensis), American robin (Turdus migratorius), red-winged blackbird (Agelaius phoeniceus), bald eagle (Haliaeetus leucocephalus), violet- greenswallow (Tachycineta thalassina), Brewer’s blackbird (Euphagus cyanocephalus), black-capped chickadee (Poecile atricapillus), white-crowned sparrow (Zonotrichia leucophrys), greater scaup (Aythya marila), mourning dove (Zenaida macroura), California gull (Larus californicus), American crow (Corvus brachyrhynchos), house sparrow (Passer domesticus) and European starling (Sturnus vulgaris). Birders have documented 187 bird species to occur in the area (eBird 2024). §Mammals: eastern gray squirrel (Sciurus carolinensis), raccoon (Procyon lotor), eastern cottontail (Sylvilagus floridanus), and nutria (Myocastor coypus) §Fish: Lake Washington and the Cedar River, adjacent to the Project site, are mapped by WDFW Priority Habitat and Species (PHS) as habitat for steelhead (Oncorhynchus mykiss), sockeye/kokanee (O. nerka), Chinook (O. tshawytscha), coho (O. kisutch), resident coastal cutthroat trout (O. clarki), and Dolly Varden/bull trout (Salvelinus malma/S. confluentus) (WDFW 2024). b.List any threatened and endangered species known to be on or near the site. Bull trout, Chinook, and steelhead are federally listed salmonid species known to occur in the Cedar River and Lake Washington, adjacent to the site (SWIFD 2024). 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 August 2025 Page 16 (WAC 197-11-960) c. Is the site part of a migration route? If so, explain. The project site, along with the entire Puget Sound region, is located within the Pacific Flyway, which is a flight corridor for migrating waterfowl and other birds. The Pacific Flyway extends south from Alaska to Mexico and South America. No portions of the proposed project would interfere with or alter the Pacific Flyway. d.Proposed measures to preserve or enhance wildlife, if any. Impacts to wildlife are not anticipated as a result of the project; therefore, measures have not been proposed. The project would not impact the Pacific Flyway. During construction, BMPs would be put in place to isolate and protect waters in the vicinity of the construction, as needed, and therefore no impacts to fish species are anticipated. e. List any invasive animal species known to be on or near the site. Mammals including eastern cottontail, eastern gray squirrel, and nutria are known to occur on or near the site. Birds, including European starling and house sparrow are also known to occur on or near the site. 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. This project is a demolition project, and no energy is required in the final condition. b.Would your project affect the potential use of solar energy by adjacent properties? If so, generally describe. The project would not affect solar energy use 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. The project will not require any power during operations and therefore, will not require energy conservation needs. 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. There is the risk of potential construction-related spills or leaks with any construction effort. This project would face similar risks, but all risks would be well within the range of typical 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 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 August 2025 Page 17 (WAC 197-11-960) construction projects. BMPs and mitigation measures will be implemented to minimize risk. No toxic chemicals would be used or stored at the construction site other than fuels and other construction-related fluids. While a hazardous material survey has not been conducted, project specifications will require the contractor to test for hazardous materials and follow proper city and state requirements for disposal. 1.Describe any known or possible contamination at the site from present or past uses. The Washington State Department of Ecology’s Spills and Cleanup map identifies a cleanup site at the Renton Municipal Airport (Action Aviation - clean site ID# 6266). This site has been affected by benzene and petroleum-based candidates. Cleanup for this site has started but has not been completed (Ecology 2024). There is no known contamination within the project area. 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. It is anticipated that asbestos exists in the existing buildings due to their age. The Contractor will investigate and propose remediation measures to remove any asbestos prior to demolition. 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. Fuels and motor oil will be used for the equipment during construction. The completed project will not require the use of any hazardous chemicals. 4.Describe special emergency services that might be required. Emergency services are not anticipated to be required during project construction. However, since this project is located at an active airport, emergency services will be notified about the project prior to its construction. 5.Proposed measures to reduce or control environmental health hazards, if any. As described in 7a above, applicable measures would be followed to minimize the release of any hazardous materials, if encountered. Additionally, a Spill Prevention Control and Countermeasure plan will be approved prior to construction. b.Noise 1.What types of noise exist in the area which may affect your project (for example: traffic, equipment, operation, other)? Aircraft traffic at the site, vehicular traffic along nearby roadways, and boat traffic in Lake Washington are the major noise sources in the area. These sources will not have any effect on the Project. 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)? SEPA Environmental checklist August 2025 Page 18 (WAC 197-11-960) Short-term noise levels will increase due to construction activities, such as the temporary operation of construction equipment. During this project no blasting will be permitted. Wrecking balls will not be permitted. The buildings will be taken down via excavators and cranes. No schedule has been coordinated; however, work will occur during daytime and evening hours only (7:00am to 3:30pm). Operation and maintenance of the Project, post- construction, will not result in any additional noise. 3.Proposed measures to reduce or control noise impacts, if any: Contractors will be required to adhere to City of Renton guidelines. Construction work would be limited to typical workday and work week hours. Nighttime and weekend work is not anticipated. The Project would follow the City of Renton’s noise guidelines which allow the use of heavy equipment from 7:00 am to 8:00 pm weekdays, 9:00 am to 8:00 pm Saturday and no activities on Sunday. 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 is an active general aviation and FAA-designated reliever airport that provides regional airport services for air charter, air taxi, corporate flights, business, and recreational flyers. Adjacent properties include a Boeing factory to the north and residential areas to the east and south. The proposal will not change the current use of the airport and will not 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 non-forest use? The site has not been used as working farmlands or forest lands. 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? The project would neither affect, nor be affected by working farm or forest land operations. c.Describe any structures on the site. Structures on site include aircraft hangars, an abandoned air traffic control tower, and other buildings supporting aircraft operations. These structures are buildings 295, 330, and 350. These are structures within the project limits. Outside the project limits are a variety of infrastructure and structures that support the airport operation. 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 August 2025 Page 19 (WAC 197-11-960) d.Will any structures be demolished? If so, what? Site demolition consists of three buildings (Buildings 295, 330, and 350). Utilities that service the buildings will be capped within five feet of the building. e.What is the current zoning classification of the site? The Project site is currently zoned Industrial Medium (IM). f.What is the current comprehensive plan designation of the site? The Project site is designated as Employment Area (EA). g. If applicable, what is the current shoreline master program designation of the site? Both the Lake Washington shoreline and Cedar River shoreline are designated as High Intensity. h. Has any part of the site been classified as a critical area by the city or county? If so, specify. The entire site as a seismic hazard and a Zone X Flood Area (500 year flood). The Flood Area starts from the adjacent Cedar River located 300 feet away from the site. The site is also located in I a Wellhead Protection Area. i.Approximately how many people would reside or work in the completed project? No one would reside in the completed Project. After construction, workers that currently work at the Airport would continue to work in the completed project. j.Approximately how many people would the completed project displace? The completed Project would not displace any people. k. Proposed measures to avoid or reduce displacement impacts, if any. Displacement would not occur as a result of the project; therefore, no mitigation measures are required. l. Proposed measures to ensure the proposal is compatible with existing and projected land uses and plans, if any. The proposed project will not change the existing land use of the site; therefore, no mitigation measures are required. m. Proposed measures to reduce or control impacts to agricultural and forest lands of long-term commercial significance, if any: There are no agricultural or forest lands in the Project vicinity. SEPA Environmental checklist August 2025 Page 20 (WAC 197-11-960) 9. Housing Find help answering housing questions12 a.Approximately how many units would be provided, if any? Indicate whether high, middle, or low-income housing. No housing units would be provided by the Project. b. Approximately how many units, if any, would be eliminated? Indicate whether high, middle, or low-income housing. No housing units would be eliminated by the Project. c. Proposed measures to reduce or control housing impacts, if any: No housing impacts will occur; therefore, no mitigation is required. 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? No new structures are proposed. The existing buildings that will be demolished are Building 295 (approximately 25 feet tall, Building 330 (approximately 20 feet tall, and Building 350 (approximately 15 feet tall). b.What views in the immediate vicinity would be altered or obstructed? No views in the immediate vicinity would be obstructed as a result of the Project. Demolishing the buildings would alter the view by removing an existing obstructing. c. Proposed measures to reduce or control aesthetic impacts, if any: No negative impacts to aesthetics will occur as a result of the Project; therefore, no mitigation measures are proposed. 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? The project will not include any new light sources. 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 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 August 2025 Page 21 (WAC 197-11-960) b.Could light or glare from the finished project be a safety hazard or interfere with views? There are no light or glare sources from the finished Project. c.What existing off-site sources of light or glare may affect your proposal? There are no offsite sources of light or glare that would affect the Project. d.Proposed measures to reduce or control light and glare impacts, if any: There are no mitigation measures associated with the project as there are no new light or glare sources of the proposed Project. 12. Recreation Find help answering recreation questions a.What designated and informal recreational opportunities are in the immediate vicinity? As an active municipal airport that is regulated by the FAA, there are no recreational opportunities on the airport or project site. b.Would the proposed project displace any existing recreational uses? If so, describe. The proposal will not change the current use of the site and will not displace any existing recreational uses. c.Proposed measures to reduce or control impacts on recreation, including recreation opportunities to be provided by the project or applicant, if any: No impacts to recreational uses are anticipated as a result of the Project; therefore, no mitigation measures are proposed. 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. There are no buildings, structures, or sites located on or adjacent to the project site that are currently listed in the National Register of Historic Places (NRHP), Washington Heritage Register, or King County Landmarks Register (Washington State Department of Archaeology and Historic Preservation [DAHP], 2024; KCHPP, 2024). The Renton Municipal Airport was established in 1941-1945, making the facility over 45 years old. In the 1920s, the prior landowner operated the Bryn Mawr Airfield at this location; today’s 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 August 2025 Page 22 (WAC 197-11-960) runway was built in 1943 and the facility was used by the Department of the Navy and the Boeing Company for World War II production of the B-29 military airplanes (Bucher, Willis, and Ratliff Corporation, 1997). The City acquired the airport in 1946 after the end of World War II. The Airport has not yet been inventoried and evaluated for its potential eligibility to the NRHP or as a King County Landmark. In addition to its runway and taxiway features, the Airport includes at least 22 individual structures built in or before 1979, making these individual structures also over 45 years old (King County Assessor, 2024; NETROnline, 2024). Three of these buildings have been previously recorded and determined not eligible for listing in the NRHP; however, the majority of the Renton Municipal Airport individual historic-aged structures and features have not yet been recorded on DAHP historic property inventory forms (DAHP, 2024). Directly south of the Renton Municipal Airport, on the opposite side of Airport Way, is the Jolly Boy Drive In at 111 Airport Way (DAHP Property ID #344312). Constructed in 1956, this building was determined eligible for listing in the NRHP in 2020 (Chambers, 2020; DAHP, 2024). 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. Nothing listed under historic register. 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. No excavation will occur on undisturbed soil. 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. 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. The site can be accessed by East Perimeter Road, the main thoroughfare through downtown Renton, by heading east on Airport Way and north on West Perimeter Road. 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? 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 August 2025 Page 23 (WAC 197-11-960) The closest transit stop is approximately a quarter mile . This stop is serviced by King County Metro bus route 107. 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). No additional transportation facility construction or improvements are proposed. d.Will the project or proposal use (or occur in the immediate vicinity of) water, rail, or air transportation? If so, generally describe. The proposal is occurring on an active public use general aviation airport used for general aviation air transportation. The site is also an airport reliever site for the Seattle-Tacoma International Airport. 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 non-passenger vehicles). What data or transportation models were used to make these estimates? The completed Project would not generate any additional vehicular trips. 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. The project will neither affect nor be affected by agricultural or forest product transportation. g.Proposed measures to reduce or control transportation impacts, if any: The selected contractor will be required to work with airport personnel to prepare aircraft traffic control plans. No impacts to transportation are anticipated after construction is completed. 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. The project would not result in a need for increased public services b.Proposed measures to reduce or control direct impacts on public services, if any. Impacts to public services are not anticipated; therefore, mitigation measures have not been developed. 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 SEPA Environmental checklist August 2025 Page 24 (WAC 197-11-960) 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. Partial capping of utility services connected to the buildings will occur. No impact to existing utilities on site. Power and natural gas to the site is provided by Puget Sound Energy (PSE). Water supply is provided by the City of Renton in the Kennydale 308-hydraulic pressure zone. Wastewater service is also provided by the City of Renton. 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. X Type name of signee: Williams Adams, P.E. Position and agency/organization: Principal Engineer, Renton Municipal Airport Date submitted: XXXX 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 19 https://ecology.wa.gov/Regulations-Permits/SEPA/Environmental-review/SEPA-guidance/SEPA-checklist- guidance/SEPA-Checklist-Section-C-Signature SEPA Environmental checklist August 2025 Page 25 (WAC 197-11-960) 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: 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? 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 August 2025 Page 26 (WAC 197-11-960) ·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.