Loading...
HomeMy WebLinkAbout6-SEPA checklist and NOC.pdf SERVICE | EXCELLENCE | EQUITY 7812 S 124th St., Seattle, Washington 98178-4830 | p.425.204.4403 | f.425.204.4476 CAPITAL PLANNING AND CONSTRUCTION NOTICE OF CONSULTATION SEPA ENVIRONMENTAL CHECKLIST Name of Proposal: Renton High School Replacement and Site Expansion (SEPA Phase 3) Applicant & Lead Agency: Renton School District Location of Proposal: Downtown Renton between Airport Way and S 2nd Street and Between Logan Ave S and Shattuck Ave S and Logan Ave S and Lake Ave S. Includes 400 S 2nd Street (Renton HS). King Co. Parcel Numbers: In the NE Quarter of Section 18, Township 23 North Range 05 East WM. 722930-0490; 722930-0515 722930-0545; 722930-0580; 722930-0595; 722930-0635; 722930-0630; 000720-0043; 000720-0017; 000720-0016; 569600-0190; 569600-0185; 569600-0180; 69600-0170; 569600-0169; 569600-0165; 569600- 0160; 569600-0155; 569600-0150; 569600-0145; 569600-0140; 000720-0167; 000720-0171; 000720-0034; 000720-0035; 000720-0033; 000720-0036; 000720-0037; 000720-0179; 000720-0038; 000720-0039; 000720-0078; 000720-0079; 000720-0072; 000720-0110; 000720-0108; 000720-0114; 000720-0040; 000720-0127; 000720-0128; 000720-0041; 000720-0214; 000720-0060 Public Comments Due: September 30, 2025 Contact: Matt Feldmeyer, Executive Director Capital Planning & Construction Renton School District No. 403 7812 South 124th Street Seattle, WA 98178-4830 Office: 425.204.4403 Capitalprojects2@rentonschools.us Proposal: The new Renton High School (RHS) campus will expand to the north and east of the historic Renton High School campus. The Renton School District (RSD) recently acquired 42 parcels (see below) adjacent to the RHS campus in order to facilitate site expansion and the shifting of the buildings and taller structures to the eastern portions, which is to avoid affecting the FAA Navigable Airspace for Renton Municipal Airport and comply with the City’s Airport Height and Use Restrictions. Most of the structures on the newly acquired parcels are currently under demolition. These parcels add to the size of the RHS campus, which after dedication of frontages to the City for right of way, will be 33.6 acres. The proposal will retain the existing 1930s historic high school building, and the interior will be renovated for RSD/RHS Support uses. The IKEA performing arts center (IPAC) will also be preserved, while the existing classroom building, gymnasium, warehouse will be demolished. A new, three-story 310,000 SF classroom building will be constructed fronting on Logan Ave S and S 2nd Ave. This includes a new gymnasium that will be constructed to the north of the new classroom portion of the building. Other structures include 960 SF concessions building, a 4,500 SF storage building and an 810 SF grounds maintenance building, as well as batting cages for both softball and baseball. The proposal includes improvements to RHS athletic fields, courts and amenities. It will add a standard competition size baseball and softball field and a multipurpose football/soccer/lacrosse practice field in the northern portion of the campus. The fields in this portion of the campus will have synthetic turf with underdrains and field lighting. The existing multipurpose field located in the western portion of campus (that currently supports three baseball, one soccer field and spectator seating) will remain in the same location but will be renovated to provide only practice track and field facilities with no spectator seating. This field will have a grass infield with underdrains and will not be lit due to the RMA airspace restrictions. The district is proposing to add two additional tennis courts, two outdoor half-court basketball courts and three outdoor pickleball courts that will be available for public use. These facilities will be unlit. The proposal will provide approximately 476 staff/visitor/student parking spaces and four small bus spaces. There will be 21 bus parking spaces provided along Logan Ave that can be used after-hours for 47 standard vehicle parking spaces. Parking for special events can be accommodated in the northwestern portion of the site for approximately 48 spaces. The proposal will require a street vacation for a portion of S Tobin St and S Tillicum St. It will also require a consolidation of all lots that comprise the RHS campus into one lot. The street vacation and lot consolidation will be processed following PUD approval. SERVICE | EXCELLENCE | EQUITY 7812 S 124th St., Seattle, Washington 98178-4830 | p.425.204.4403 | f.425.204.4476 CAPITAL PLANNING AND CONSTRUCTION The proposed project would reconfigure access and parking for the overall campus. The segments of S Tobin St and S Tillicum St between Shattuck Ave S and Logan Ave S are proposed to be vacated to create a consolidated school property. Access to the campus will be via an expanded drop-off/pick-up lane on S 2nd St; at S 2nd St near the intersection of Lake Ave S; at Lake Ave S; and at the intersection of S Tobin St and Shattuck Ave S. School buses will load/unload in a pullout lane on Logan Ave S. Students will remain onsite during construction. School capacity will increase from 1,389 to 1,600 students; however enrollment levels (currently 1,208 students) are not anticipated to increase in the near-term. Other Permits/Approvals Anticipated: City of Renton: PUD approval, Conditional Use Permit, Civil Construction Permit, Building Permits, Demolition Permits, Street Vacations, Lot Consolidation; Dept. of Ecology: National Pollutant Discharge Elimination System (NPDES) Permit; FAA: Form 7460-1 No Hazard Determinations; WA Dept. Arch and Historic Preservation (DAHP): Review Historic and Cultural Resources Reports, Archaeological Site Alteration and Excavation Permit Application; Puget Sound Clean Air Agency: Approval for removal of asbestos if found in structures. Environmental Documents: Archaeology Work Plan, June 2024; Archaeological Monitoring and Inadvertent Discovery Plan for Geotechnical Boring, 2024; RHS Built Environment Inventory Report, January 2025; Archaeological Resources Survey, March 2025; Addendum to Archaeological Resources Survey, Feb. 2025; Addendum to Archaeological Resources Survey, May 2025; Archaeological Monitoring and Inadvertent Discovery Plan for Demolition for the Renton High School Project, May 2025; Confidential Memorandum-Impacts to Moses Homestead Site, July 2025; Confidential Memorandum-Impacts to Recontact Sites and Other Historic Properties, July 2025; Critical Areas Reconnaissance Study, March 2025; Dept. of Ecology letter, April 4, 2025;Conceptual Site, Grading and Utilities Plan, Sept., 2025; Conceptual Landscape Architecture Plans, dated Sept., 2025; Geotechnical Report, Sept. 2025; Transportation Technical Report prepared by Heffron Transportation, Inc., dated Sept. 2025; Tree Retention/Land Clearing Plan, Sept. 2025; Tree Credit Worksheet, Sept. 2025; Field Lighting Summary prepared by MUSCO dated Sept. 2025; Site Lighting Plans and Photometric Analysis prepared by GFT, Inc., Sept. 2025; Construction Phasing Plan prepared by Skanska Building USA dated Sept. 2025; Preliminary Hazardous Building Survey for RHS dated Sept. 2025; FAA Form 7460-I Determinations of No Hazard, April 2025. To Be Prepared: Hazardous Materials Survey Reports for buildings to be demolished; Addendum #3 to the Archaeological Resources Survey; DAHP Archaeological Site Alteration and Excavation Permit Application; Temporary Erosion Sediment Control (TESC) Plan and Stormwater Pollution Prevention Plan (SWPPP). Availability of File and Environmental Documents: The official project file containing the SEPA checklist and related plans and documents is available for public review during normal business hours at the District address listed above. Published in the Seattle Times and Daily Journal of Commerce: Sept. 16, 2025; Renton Reporter: Sept. 18, 2025 SEPA Environmental checklist September 2023 Page 1 (WAC 197-11-960) SEPA 1 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 September 2023 Page 2 (WAC 197-11-960) A. Background 1. Name of proposed project, if applicable: Renton High School Replacement and Site Expansion (SEPA Phase 3) 2. Name of applicant: Renton School District 3. Address and phone number of applicant and contact person: Applicant: Matt Feldmeyer Executive Director, Capital Planning and Construction Renton School District 7812 South 124th Street Seattle, WA 98178 (206) 482-5253 Agent: Lisa Klein, AICP AHBL, Inc. 2215 N 30th Street Suite 300 Tacoma, WA 98403 (253) 383-2422 4. Date checklist prepared: September 12, 2025 5. Agency requesting checklist: Renton School District 6. Proposed timing of schedule (including phasing, if applicable): This SEPA Checklist represents Phase 3 of environmental review for the Renton High School Replacement and Site Expansion Project. Demolition of some of the newly acquired structures, utilities and paving was evaluated through two previous SEPA phases: Renton High School Demolition Phase 1 (March – June 2025) and Phase 2 (May – July 2025). The demolition associated with Phases 1 and 2 is underway and is anticipated to continue through February 2026. The demolition of other newly acquired structures not covered under Phase 1 and 2 is included in this Phase 3 of SEPA review, the final phase, and will commence in the winter of 2025 – 2026, with demolition of the school buildings to occur later in 2028 and 2029. Phase 3 also evaluates all other environmental elements for the replacement and site expansion of Renton High School. SEPA Environmental checklist September 2023 Page 3 (WAC 197-11-960) Construction of the new school campus will be phased to minimize disruptions to the school campus, including community use. The first phase will begin at the conclusion of school activities in June of 2026 beginning with the west parking lot and frontage improvements to 2nd Ave. The construction of the new high school building will begin in September 2026 with occupancy of the new school building anticipated fall of 2028. Demolition of the existing school buildings and site work including remaining athletic fields/courts, parking, and frontage improvements will occur in 2028 and 2029. Construction activities will continue onsite until September of 2030. 7. Do you have any plans for future additions, expansion, or further activity related to or connected with this proposal? If yes, explain. There are no further plans associated with this proposal. 8. List any environmental information you know about that has been prepared, or will be prepared, directly related to this proposal. Has been prepared: • Archaeology Work Plan, prepared by HRA dated June 2024 • Archaeological Monitoring and Inadvertent Discovery Plan for Geotechnical Boring prepared by HRA dated 2024 • RHS Built Environment Inventory Report prepared by HRA dated January 2025 • Archaeological Resources Survey by Historical Research Associates, Inc. dated March 2025 • Addendum to Archaeological Resources Survey by Historical Research Associates, Inc. Feb. 2025 • Addendum to Archaeological Resources Survey by Historical Research Associates, Inc. May 2025 • Archaeological Monitoring and Inadvertent Discovery Plan for Demolition for the Renton High School Project by Historical Research Associates, Inc. May 2025 • Confidential Memorandum-Impacts to Moses Homestead Site, prepared by Historical Research Associates, Inc. dated July 2025 • Confidential Memorandum-Impacts to Recontact Sites and Other Historic Properties, prepared by Historical Research Associates, Inc. dated July 2025 • Critical Areas Reconnaissance Study: Technical Memorandum prepared by Facet, dated March 2025. • Dept. of Ecology letter dated April 4, 2025 regarding soil contamination • Conceptual Site, Grading and Utilities Plan prepared by AHBL dated September, 2025 • Conceptual Landscape Architecture Plans prepared by AHBL dated September, 2025 • Geotechnical Report prepared by AESI dated September 2025 • Transportation Technical Report prepared by Heffron Transportation, Inc., dated September 2025 SEPA Environmental checklist September 2023 Page 4 (WAC 197-11-960) • Tree Retention/Land Clearing Plan prepared by Atlas Technical Consultants dated September 2025 • Tree Credit Worksheet prepared by AHBL dated September 2025 • Field Lighting Summary prepared by MUSCO dated September 2025 • Site Lighting Plans and Photometric Analysis prepared by GFT, Inc. dated Sept. 2025 • Construction Phasing Plan prepared by Skanska Building USA dated September 2025 • Hazardous Building Survey for RHS prepared by Apex Companies dated Sept. 2025. • FAA Form 7460-I Determinations of No Hazard dated April 2025 (compiled Sept. 2025) To be prepared: • Hazardous Materials Survey Reports for buildings to be demolished • Addendum #3 to the Archaeological Resources Survey by Historical Research Associates • DAHP Archaeological Site Alteration and Excavation Permit Application • Temporary Erosion Sediment Control (TESC) Plan and Stormwater Pollution Prevention Plan (SWPPP) will be submitted as part of the construction permit application. 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. There are no other known pending applications or government approvals impacting this project. 10. List any government approvals or permits that will be needed for your proposal, if known. City of Renton: PUD approval, Conditional Use Permit, Civil Construction Permit, Building Permits, Demolition Permits, Street Vacations (portions of S Tobin Street and S Tillicum Street), Lot Consolidation. Dept. of Ecology: National Pollutant Discharge Elimination System (NPDES) Renton School District: SEPA determination FAA: Form 7460-1 No Hazard Determinations WA Dept. Arch and Historic Preservation (DAHP): Review Historic and Cultural Resources Reports, Archaeological Site Alteration and Excavation Permit Application Puget Sound Clean Air Agency: Approval for removal of asbestos if found in structures. 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.) SEPA Environmental checklist September 2023 Page 5 (WAC 197-11-960) As a result of a Citizens Facility Advisory Committee process in 2021–2022, Renton School District (RSD) determined that a replacement for Renton High School (RHS) was needed to provide a more equitable comprehensive high school building and site for RHS students, staff, and families, and this project was approved by voters in the November 2022 Bond election. After an extensive property search, in May 2023, the Renton School Board approved the plan to review expanding the footprint of the current RHS location. Existing RHS Campus/Site Details The current Renton High School campus is situated on 23.23 acres located at 400 S 2nd St, Renton, Washington. Renton High School began instruction in 1911 on 2 acres in a 3- story building. In the 1930s a new building was constructed to the west of the 1911 building and the 1911 building was demolished in the 1940s. Various additions and improvements have been added to the campus over the years. The existing High School campus has four main buildings: 1. The main instructional building (179,772 SF) constructed in 1932, which is three stories in height and composed of masonry. Three wings were added to the building in 1942, 1954 and between 1969 and 1977. The original 1932 building is considered eligible for listing on the National Register of Historic Places (NRHP). 2. A gymnasium and cafeteria building (85,025 SF) constructed in 1958 and composed of concrete and metal-framed windows, and 3. A vocational instruction building (27,500 SF) constructed in 1964 and later converted in 1999 to house district nutritional services and surplus. It is composed of concrete with brick veneer cladding. 4. The IKEA performing arts center (IPAC) building (17,500 SF) constructed in 2003. Also existing on the current site are four tennis courts, two sports field areas primarily used as baseball/softball and soccer fields, a courtyard and approximately 350 parking spaces. The buildings are centrally located on the school grounds while the fields, courts, and parking areas are east and west of the buildings. Access to the campus is currently provided via S 2nd St and Logan Ave S. Approximately 5 acres of the site is restricted from future development by the Runway Protection Zone for the Renton Municipal Airport. Proposed RHS Renovation and Site Expansion The new Renton High School (RHS) campus will expand to the north and east of the historic Renton High School campus. The Renton School District (RSD) recently acquired 42 parcels (see below) adjacent to the RHS campus in order to facilitate site expansion and the shifting of the buildings and taller structures to the eastern portions, which is to avoid affecting the FAA Navigable Airspace for Renton Municipal Airport and comply with the City’s Airport Height and Use Restrictions. Most of the structures on the newly acquired parcels are SEPA Environmental checklist September 2023 Page 6 (WAC 197-11-960) currently under demolition. These parcels add to the size of the RHS campus, which after dedication of frontages to the City for right of way, will be 33.6 acres. The proposal will retain the existing 1930s historic high school building, and the interior will be renovated for RSD/RHS Support uses. The IKEA performing arts center (IPAC) will also be preserved, while the existing classroom building, gymnasium, warehouse will be demolished. A new, three-story 310,000 SF classroom building will be constructed fronting on Logan Ave S and S 2nd Ave. This includes a new gymnasium that will be constructed to the north of the new classroom portion of the building. Other structures include 960 SF concessions building, a 4,500 SF storage building and an 810 SF grounds maintenance building, as well as batting cages for both softball and baseball. The proposal includes improvements to RHS athletic fields, courts and amenities. It will add a standard competition size baseball and softball field and a multipurpose football/soccer/lacrosse practice field in the northern portion of the campus. The fields in this portion of the campus will have synthetic turf with underdrains and field lighting. The existing multipurpose field located in the western portion of campus (that currently supports three baseball, one soccer field and spectator seating) will remain in the same location but will be renovated to provide only practice track and field facilities with no spectator seating. This field will have a grass infield with underdrains and will not be lit due to the RMA airspace restrictions. The district is proposing to add two additional tennis courts, two outdoor half-court basketball courts and three outdoor pickleball courts that will be available for public use. These facilities will be unlit. The proposal will provide approximately 476 staff/visitor/student parking spaces and four small bus spaces. There will be 21 bus parking spaces provided along Logan Ave that can be used after-hours for 47 standard vehicle parking spaces. Parking for special events can be accommodated in the northwestern portion of the site for approximately 48 spaces. The proposal will require a street vacation for a portion of S Tobin St and S Tillicum St. It will also require a consolidation of all lots that comprise the RHS campus into one lot. The street vacation and lot consolidation will be processed following PUD approval. The proposed project would reconfigure access and parking for the overall campus. The segments of S Tobin St and S Tillicum St between Shattuck Ave S and Logan Ave S are proposed to be vacated to create a consolidated school property. Access to the campus will be via an expanded drop-off/pick-up lane on S 2nd St; at S 2nd St near the intersection of Lake Ave S; at Lake Ave S; and at the intersection of S Tobin St and Shattuck Ave S. School buses will load/unload in a pullout lane on Logan Ave S. SEPA Environmental checklist September 2023 Page 7 (WAC 197-11-960) Students will remain onsite during construction. School capacity will increase from 1,389 to 1,600 students; however enrollment levels (currently 1,208 students) are not anticipated to increase in the near-term. 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 proposed new Renton High School campus is bounded on the north by S Tobin St and Airport Way, on the east by Logan Ave S, on the south by S 2nd St and on the west by Lake Ave S and Shattuck Ave S in downtown Renton. The main entrance and address will continue to be 400 S 2nd St Renton, WA 98057. The properties comprising the expanded campus are located in Township 23 North, Range 5 East, Section 18, Willamette Meridian, U.S. Geological Survey (USGS) Renton Topographic Quadrangle. They are comprised of 43 tax parcels as follows: Parcel Property Address 722930-0490 301 Airport Way 722930-0515 505 Airport Way 722930-0545 423 - 455 Airport Way 722930-0580 511 Airport Way 722930-0595 43-49 Logan Ave S 722930-0635 51 Logan Ave S 722930-0630 55 Logan Ave S 000720-0043 59 Logan Ave S 000720-0017 75 Logan Ave S 000720-0016 81 Logan Ave S 569600-0190 97 Logan Ave S 569600-0185 103 Logan Ave S Parcel Property Address 569600-0180 107 Logan Ave S 569600-0170 109 Logan Ave S 569600-0169 113 Logan Ave S 569600-0165 117 Logan Ave S 569600-0160 121 Logan AveS 569600-0155 127 Logan Ave S 569600-0150 129 Logan Ave S 569600-0145 526 2nd Ave S 569600-0140 526 2nd Ave S 000720-0167 54 – 56 Shattuck Ave S 000720-0171 58 - 60 Shattuck Ave S 000720-0034 300 – 302 S Tobin St SEPA Environmental checklist September 2023 Page 8 (WAC 197-11-960) 000720-0035 312 S Tobin St 000720-0033 314 S Tillicum St 000720-0036 316 S Tobin St 000720-0037 402 S Tobin St 000720-0179 406 S Tobin St 000720-0038 408 S Tobin St 000720-0039 414 S Tobin St 000720-0078 416 S Tobin St 000720-0079 418 S Tobin St 000720-0072 420 S Tobin St 000720-0110 500 S Tobin St 000720-0108 502 S Tobin St 000720-0114 504 S Tobin St 000720-0040 508 S Tobin St 000720-0127 509 S Tobin St 000720-0128 513-515 S Tobin St 000720-0041 518 S Tobin St 000720-0214 311 S Tillicum St, 000720-0060 400 2nd Ave Figure 1: Vicinity Map SEPA Environmental checklist September 2023 Page 9 (WAC 197-11-960) B. Environmental Elements 1. Earth a. General description of the site: The site is in an urbanized area of Renton, partially in and adjacent to downtown Renton. The site is generally flat. Circle or highlight one: Flat, rolling, hilly, steep slopes, mountainous, other: b. What is the steepest slope on the site (approximate percent slope)? Topography across the site and surrounding areas is relatively flat to very gently sloping to the northwest. Overall vertical relief across the school campus trending south to north is approximately 4 feet over a distance of about 850 feet (approximately 0.5%). 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. Associated Earth Sciences, Inc. (AESI) performed field explorations and a review of selected applicable geologic literatures. AEIS concluded that, consistent with regional soils mapping (Soil Survey of King County Area, Washington, U.S. Department of Agriculture (USDA), Soils Conservation Services (SCS) now referred to as Natural Resources Conservation Services (NRSC)), the site is underlain by Urban Land (Ur) soils. Urban Land soil is soils that has been modified by disturbance of the natural layers with additions of fill material several feet thick. The site does not contain agricultural lands of long-term commercial significance. d. Are there surface indications or history of unstable soils in the immediate vicinity? If so, describe. City of Renton GIS mapping indicates that the area is at a high risk for seismic hazard. This seismic hazard area encompasses most of downtown Renton and all along the Cedar River to the east of the proposal area. Site-specific evaluation by AESI describes the soils as being susceptible to liquefaction, which will require mitigation for site work and foundation support in the form of aggregate pier footings. 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. SEPA Environmental checklist September 2023 Page 10 (WAC 197-11-960) The project will require earthwork for building demolition and to install subgrades for parking, walkways, buildings, and play fields. The project will see approximate 33,000 CY of fill and 4,900 CY of cut. Onsite soils are not suitable for use as fill. The sources of structural fill are not yet determined but will be from an approved source. f. Could erosion occur because of clearing, construction, or use? If so, generally describe. Erosion could occur during construction activities associated with grading and filling. To minimize potential erosion impacts, temporary erosion procedures and best management practices will be employed. g. About what percent of the site will be covered with impervious surfaces after project construction (for example, asphalt or buildings)? Approximately 74% percent of the completed project will be impervious, including buildings, parking, walkways, and under-drained athletic fields. h. Proposed measures to reduce or control erosion, or other impacts to the earth, if any. During construction, temporary erosion and sediment controls will be used to ensure earthwork does not cause any erosion impacts. A Temporary Erosion Sediment Control (TESC) Plan and Stormwater Pollution Prevention Plan (SWPPP) will be prepared in accordance with the requirements of the City’s adopted stormwater manual will be submitted as part of the construction permit application. Planned measures include installing filter socks in existing catch basins and setting up straw wattles, silt fencing, and interceptor swales. Temporary tanks will be placed on site to help remove sediments. To mitigate and reduce the erosion hazard and potential for off-site sediment transport, the following recommendations of the geotechnical engineer (see Draft Geotechnical Report dated Sept, 2025 prepared by AESI, or as updated) shall be followed: 1. Construction activity should be scheduled or phased as much as possible to avoid earthwork activity during the wet season. 2. The winder performance of the site is dependent on a well-conceived plan for control of site erosion and stormwater runoff. The site plan should include ground-cover measures and staging areas. The contractor should be prepared to implement and maintain the required measures to reduce the amount of exposed ground. 3. TESC elements and perimeter flow control should be established prior to the start of grading. This should include, but is not limited to, silt fencing, swales with check dams, rocked construction entrance, etc. SEPA Environmental checklist September 2023 Page 11 (WAC 197-11-960) 4. During the wetter months of the year, or when significant storm events are predicted during the summer months, the work area should be stabilized so that if showers occur, it can receive the rainfall without excessive erosion or sediment transport. The required measures for an area to be “buttoned-up” will depend on the time of year and the duration that the area will be left unworked. During the winter months, areas that are to be left unworked for more than 2 days should be mulched or covered with plastic. During the summer months, stabilization will usually consist of seal-rolling the subgrade. Such measures will aid in the contractor’s ability to get back into a work area after a storm event. The stabilization process also includes establishing temporary stormwater conveyance channels through work areas to route runoff to the approved treatment/discharge facilities. 5. Surface runoff and discharge should be controlled during and following development. Uncontrolled discharge may promote erosion and sediment transport. 6. Soils that are to be reused around the site should be stored in such a manner as to reduce erosion from the stockpile. Protective measures may include, but are not limited to, covering stockpiles with plastic sheeting, or the use of silt fences around stockpile perimeters. To mitigate the risk of liquefaction-induced settlement, the geotechnical engineer recommends ground improvements for the building foundation as detailed in their August 2025 Geotechnical Report. 2. Air 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. Demolition activities have the potential to create temporary dust emissions during earth-moving activities and exhaust emissions due to the combustion of gasoline and diesel fuels. Dust and exhaust emissions are expected to be minimal, localized, and temporary. Testing for hazardous materials is in process and will be completed prior to demolition of the structures. If there are hazardous materials discovered, city, state and federal regulations will be followed to ensure proper disposal of those materials so that release of hazardous materials to the air are prevented. SEPA Environmental checklist September 2023 Page 12 (WAC 197-11-960) New emissions generated by the completed project will be related to vehicle emissions. Because the school is existing, any increase in vehicle emissions are anticipated to be low and not significant. b. Are there any off-site sources of emissions or odor that may affect your proposal? If so, generally describe. The site is bounded by city roadways that generate vehicle emissions that may be present in the vicinity of the site. The Renton Municipal Airport is approximately .25 miles from the site, and aviation activities cause emissions and odor. These emissions are not expected to affect the project. c. Proposed measures to reduce or control emissions or other impacts to air, if any: During construction, temporary measures will be applied where necessary, which may include limiting the idling of construction equipment, water sprays to control dust, limiting vehicle speeds, and general maintenance of construction equipment. If there are hazardous materials discovered in the buildings to be demolished, all city, state and federal regulations will be followed to ensure proper handling and disposal of those materials. After construction school buses will not be allowed to idle during loading and unloading times. 3. Water a. Surface: 1. Is there any surface water body on or in the immediate vicinity of the site (including year-round and seasonal streams, saltwater, lakes, ponds, wetlands)? If yes, describe type and provide names. If appropriate, state what stream or river it flows into. The Cedar River flows through downtown Renton and is approximately 280 ft to the northeast of the Phase 2 Demolition properties. There are no known surface water bodies on the subject properties. 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. No work will be required over, in, or adjacent to the Cedar River. 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 will be placed in or removed from surface water. SEPA Environmental checklist September 2023 Page 13 (WAC 197-11-960) 4. Will the proposal require surface water withdrawals or diversions? Give a general description, purpose, and approximate quantities if known. No surface water will be withdrawn or diverted as a result of this proposal. 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 King County iMap, the project area lies within a FEMA recognized 500-year floodplain area. FEMA FIRM panel: 53033C0977G. 6. Does the proposal involve any discharges of waste materials to surface waters? If so, describe the type of waste and anticipated volume of discharge. No, the proposal does not involve any discharges of waste materials to surface waters. b. Ground: 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. There will be no groundwater withdrawn from a well for this proposal. Stormwater and irrigation water will not be discharged or infiltrated to groundwater. 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. There will be no wastewater material discharged into the ground. c. Water Runoff (including stormwater): 1. Describe the source of runoff (including storm water) and method of collection and disposal, if any (include quantities, if known). Where will this water flow? Will this water flow into other waters? If so, describe. Stormwater is generated by rainwater falling on the surfaces within the campus, both pollution generating (parking lots and drive aisles) and non-pollution generating (rooftops and landscaped areas). Currently, stormwater runoff is collected in a tight-line storm system and conveyed to City of Renton drainage system. For most of the site, stormwater is ultimately charged to the Black River Wetlands, while for the eastern portion, stormwater is conveyed to the Cedar River. SEPA Environmental checklist September 2023 Page 14 (WAC 197-11-960) After the project is constructed, runoff will be collected and conveyed in underground pipes to stormwater treatment systems and detention pipe systems, before being directed to the city’s stormwater system. 2. Could waste materials enter ground or surface waters? If so, generally describe. No waste materials are expected to enter ground or surface waters as a result of this proposal. TESC measures will be employed in an effort to control erosion during demolition and the period following demolition when the parcel soils will be stabilized with hydroseed or straw. 3. Does the proposal alter or otherwise affect drainage patterns in the vicinity of the site? If so, describe. The proposal will not alter or affect drainage patterns in the vicinity. d. Proposed measures to reduce or control surface, ground, and runoff water, and drainage pattern impacts, if any: This project will be constructed in compliance with City of Renton stormwater standards. Since the site is located in a drainage basin that was more than 40% impervious in 1985, the flow control standard is to match the existing condition. This project will meet this requirement using detention tanks connected to control manholes. The project will protect water quality by directing runoff from pollution generating surfaces to manufactured treatment devices, such as Filterra or Biopod. 4. Plants 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? SEPA Environmental checklist September 2023 Page 15 (WAC 197-11-960) A Tree Retention and Land Clearing Plan was prepared for the project by Atlas Technical Consultants dated Sept. 2025. Conceptual Landscape Plans and a Tree Credit Worksheet was prepared by AHBL dated Sept. 2025. The plans describe existing vegetation as variable and typical of developed urban area landscaping. There are many mature trees onsite, including 212 significant trees (both deciduous and evergreen), together with shrubs, grass and decorative plants. Much of the existing landscaping will be removed and replaced. 28 of the significant trees will be retained. Most of the landmark trees located along S 2nd Ave and Airport Way will be retained. c. List threatened and endangered species known to be on or near the site. There are no known endangered plant species on or near the site. d. Proposed landscaping, use of native plants, or other measures to preserve or enhance vegetation on the site, if any. A Landscape Plan has been prepared for the project by AHBL dated Sept. 2025. The site will be landscaped using native vegetation. Planting also avoids vegetation that attracts wildlife per FAA regulations. The plaza north of the school, which also serves as a fire lane, features zig-zagging paving patterns modeled after riverbanks, and features benches like driftwood or boats. the exposed aggregate patterns help break up the fire lane and celebrate the history and context of the site. A large existing oak and adjacent plantings provide shade and scale for the performance circle at the north end of the plaza. Pockets of feature planting highlight entry points and provide focal points at key picture windows. Street trees ring the site at an average of 30 LF. Shrubs and groundcovers provide a site perimeter buffer and will be installed at or above the required minimum sizes. Tree quantities in the parking areas meet the parking lot standards based on number of stalls. Irrigation is provided for in new planting areas. In accordance with RMC 4-4-130(H).10, tree protection fencing, root discovery, and pruning methods will be employed during construction and any pruning needed for clearance will follow industry standard practices. The best management practices for tree protection during construction, which are detailed in the Tree Retention Report, shall be followed. To compensate for tree removal above the code-required minimum, and as allowed per RMC 4-4-130(J)4.e, the District will pay an “in-lieu” fee into the city’s Urban Forestry Program fund. e. List all noxious weeds and invasive species known to be on or near the site. King County iMap does not list any instances of noxious weeds or invasive species. SEPA Environmental checklist September 2023 Page 16 (WAC 197-11-960) 5. Animals 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. Examples include: • Birds: hawk, heron, eagle, songbirds, other: • Mammals: deer, bear, elk, beaver, other: small mammals • Fish: bass, salmon, trout, herring, shellfish, other: The site is in an urban area. Animals are likely to be limited to those typically found in heavily urbanized terrain. b. List any threatened and endangered species known to be on or near the site. According to the Washington Department of Fish and Wildlife’s PHS on the web mapping tool, there are no known threatened or endangered species on or near the site. The Cedar River, which at the closest point is approximately 280 feet to the east, is known to contain Steelhead, Coho and Chinook marine species. c. Is the site part of a migration route? If so, explain. The Puget Sound region is part of the Pacific flyway, a bird migration route. d. Proposed measures to preserve or enhance wildlife, if any. The proposal is in a developed urban area and does not anticipate any impacts to wildlife; therefore, no measures are proposed. e. List any invasive animal species known to be on or near the site. There are no known invasive animal species on or near the site. 6. Energy and natural resources a. What kinds of energy (electric, natural gas, oil, wood stove, solar) will be used to meet the completed project's energy needs? Describe whether it will be used for heating, manufacturing, etc. Per Washington State Energy Code requirements, electricity will be the energy source of heating/cooling/ventilation/domestic water heating for the new building as well as any site buildings. The new building will not utilize natural gas for any heating, ventilation, air conditioning, or domestic water heating for this building. Natural gas will be provided for the 1930’s building renovation heating boiler plant for building heating, as well as domestic water heating. Electricity will be provided for all other energy needs of this building. The new building is designed to meet the requirements of WA State Clean Buildings Performance Standards (CBPS). SEPA Environmental checklist September 2023 Page 17 (WAC 197-11-960) Electrical service will be a combination of utility power grid and onsite solar-generated power. b. Would your project affect the potential use of solar energy by adjacent properties? If so, generally describe. No, the project will not affect the potential use of solar energy by adjacent properties. The new building will cast shadows, but they will fall onsite and not affect 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 proposed new building includes energy code minimum requirements, Energy Star certified equipment, on-site renewable energy, minimum energy metering, permanent shading in classrooms, low-emitting interior finishes, a GHG reduction plan, EV charging spaces, integrated pest management program, food waste reduction program, and use of LED light fixtures with daylighting and occupancy controls. The new building will be served by high-efficiency air-to-water heat pumps that provide heating and cooling to the building, with Coefficients of Performance (COPs) in excess of current energy code. Ventilation is provided by dedicated outdoor air systems as required per the energy code, with high-efficiency heat recovery that will have performance in excess of current code. Domestic water will be heated via high- efficiency air-source heat pump water heaters. The building will utilize a control system with logic programmed to minimize mechanical energy usage while maintaining building comfort. Architecturally the new building envelope performance will be above code minimum and there will be exterior shading devices provided throughout the building. 7. Environmental health a. Are there any environmental health hazards, including exposure to toxic chemicals, risk of fire and explosion, spill, or hazardous waste, that could occur because of this proposal? If so, describe. As with any construction project, there is the potential for accidental spills of hazardous materials from construction equipment and vehicles. Spilled materials could include fuels, lubricants, solvents, antifreeze, and similar substances. If not contained, these contaminants could enter groundwater or surface water. School operation is not expected to generate environmental health hazards. 1. Describe any known or possible contamination at the site from present or past uses. SEPA Environmental checklist September 2023 Page 18 (WAC 197-11-960) Per the Department of Ecology What’s in My Neighborhood map, there are 12 cleanup sites (“cleanup started” or “awaiting cleanup”) within approximately 0.25 miles of the expanded campus. Cleanup Started Awaiting Cleanup Dennys Restaurant Sky Harbor Aviation Lockwood Ind Inc Renton First Savings Bank NW Qwest Corporation W00276 SDS Partners Tire Store Safeway Fuel Renton Walker’s Renton Subaru Used Cars Firestone 31A3 According to a letter from the Department of Ecology dated April 4, 2025, there is petroleum contamination associated with the removal of an underground storage tank located at 307 Airport Way that is awaiting cleanup (Cleanup Site ID 972, Facility Site ID 63618514, noted as SDS Partners). Demolition of structures will not occur until completion of Hazardous Building Materials Surveys to test for environmental hazards including asbestos, lead, and contamination from oil heating tanks and other. These reports will identify the hazardous materials and provide recommendations for safe handling and disposal in compliance with City, State and Federal regulations. This includes decommissioning, cleaning and removing any USTs that may be found and testing soil and groundwater for contamination as per the Model Toxics Control Act (MTCA). RHS is identified as being located within the Asarco Tacoma Smelter Site for which cleanup has started. The area is identified on the Department of Ecology Tacoma Smelter Plume map as having a predicted arsenic concentration under 20 ppm, which is under MTCA cleanup levels. 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. There are no major pipelines or known underground storage tanks located within the project area or vicinity. 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. The proposal does not involve the storage or use of toxic or hazardous chemicals, beyond what is necessary for construction-related activities. 4. Describe special emergency services that might be required. SEPA Environmental checklist September 2023 Page 19 (WAC 197-11-960) No additional emergency services will be required for this project. 5. Proposed measures to reduce or control environmental health hazards, if any. Any toxic or unsafe materials found on the site will be removed pursuant to applicable regulatory requirements. Care will be taken during construction to avoid spills or leaks of petroleum-based products or chemicals used for construction. The contractor will follow due diligence processes to evaluate and, as necessary, mitigate potential impacts identified. Contractors will be required to comply with all applicable health and safety regulations, including State of Washington Department of Labor and Industries General Occupational Health Standards, Chapter 296-62 WAC, and General Safety and Health Standards, Chapter 296-24 WAC. The contractor will be required to comply with asbestos abatement laws during demolition, including Washington Dept. of Labor and Industries requirements, Puget Sound Clean Air Agency requirements and the recommendations provided in the Hazardous Building Materials Surveys. During excavation, appropriate health and safety measures will be required where contaminated soils, sediment, surface water, or groundwater could be present, including the use of personal protective equipment, worker training and certification, and conducting visual and olfactory assessments. If suspect soils or groundwater are encountered, sampling and laboratory analysis will be performed for proper identification, handling, management, and disposal. Proper cleanup of the contaminated soils associated with Cleanup Site ID 972, Facility Site ID 63618514 is to be completed in accordance with the requirements of Dept. of Ecology. b. Noise 1. What types of noise exist in the area which may affect your project (for example: traffic, equipment, operation, other)? The King County Assessor lists the traffic noise level as high, however the ambient noise will not affect the project. This site is located in a primarily urban area. Airport Way is designated as a principal arterial, while Logan Ave S is designated as a minor arterial. Renton Municipal Airport is about a quarter mile to the north, which also creates external noise. Significant acoustic enhancements to the building envelope are planned to control airport noise in the building. 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 September 2023 Page 20 (WAC 197-11-960) The operation of trucks and excavators associated with construction activities are likely to cause an increase in noise levels and vibrations during construction. Activities will take place within the City of Renton prescribed hours of Monday through Friday, 7 a.m. through 8 p.m. and Saturday 9 a.m. through 8 p.m. Long term, noise typically associated with a high school will be experienced and will be approximately the same as existing. Noise associated with outdoor sports activities will be moved from the west side of campus to the northeast corner. There is no amplified noise currently and no speakers or noise amplification of sports activities is planned. 3. Proposed measures to reduce or control noise impacts, if any: Construction noise will be completed in accordance with the City of Renton requirements. Following construction, noise levels are expected to be similar to existing and not significant. 8. Land and shoreline use 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 project area is comprised of a historic high school campus established in 1911 and a mix of residential, office and commercial properties that were recently acquired. Currently the site houses a high school building, constructed in the 1930s and several additions. The campus was added to and remodeled over the years until the last major remodel and addition of the IKEA Performing Arts Center in 2002-2003. The additional 42 parcels (approximately 344,930 SF of land area) that comprise the expansion area have been acquired by Renton School District in 2024 and 2025 to integrate into the new/ expanded RHS campus. Structures, asphalt and utilities on some of those properties are in the process of demolition. The area in which this project is occurring is part of downtown Renton, and the current uses surrounding it range from small-scale commercial buildings, single-family homes, auto-oriented service buildings, office, mixed use, retail, parking lots and garages, public spaces and multi-family housing, ranging in age from 1900 to 2000. The northern portion of the site abuts Airport Way, which is classified as a Principal Arterial, and has primarily Industrial and commercial land uses, without much pedestrian infrastructure or housing. Airport Way is bounded on the north by the Renton Municipal Airport. SEPA Environmental checklist September 2023 Page 21 (WAC 197-11-960) The current and proposed southern border of the site is S 2nd St, also classified as a Principal Arterial. This street connects downtown Renton to Rainier Ave. Similar to the above general description, the land uses have changed continuously over time but generally reflect urban and commercial uses ranging in development between 1900 and 2025. The street itself is a boulevard with a median planted with mature street trees. The western portion of the site is Lake Ave S, and it not proposed to see dramatic changes, mostly due to the FAA restrictions regarding height. Lake Ave S is not classified by the City of Renton and is only two blocks from Airport Way to S. 2nd St. Uses along Lake Ave S include single-story commercial or light industrial buildings with surface parking- examples include a church, a clinic, a law office. Several of the buildings are fronting on Rainier Ave S and in some areas, Lake Ave could be seen as more of a wide alley. The east side of the site is bounded by Logan Ave S. This is designated as a minor arterial. Logan Ave S uses are currently mostly small-scale residential uses, with similarly scaled commercial uses on the corners of the major arterials. b. Has the project site been used as working farmlands or working forest lands? If so, describe. How much agricultural or forest land of long-term commercial significance will be converted to other uses because of the proposal, if any? If resource lands have not been designated, how many acres in farmland or forest land tax status will be converted to nonfarm or nonforest use? The subject site has not been used as working farm 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? No, the proposal will not affect any farm or forest lands, as there are none in the area. c. Describe any structures on the site. The following structures are located on the Phase 3 SEPA properties that are part of the expanded Renton High School campus. Structures that were described as “to be demolished” in the Phase 1 and Phase 2 Renton High School Demolition SEPA were previously evaluated under SEPA and are not included in this list. RHS Reconstruction and Site Expansion Phase 3 SEPA Properties - Onsite Structures ID Parcel Property Address Current Use, built date Bldg. size (SF) SEPA Environmental checklist September 2023 Page 22 (WAC 197-11-960) 1. 722930-0490 301-309 Airport Way Warehouse, 1947 26,954 2. 722930-0635 51 Logan Ave S SF Home, 1916 1,820 3. 569600-0185 103 Logan Ave S SF home, built 1938 1,470 4. 569600-0180 107 Logan Ave S Vacant 0 5. 000720-0034 300 – 302 S Tobin Duplex, 1948 2,030 6. 000720-0037 402 S Tobin St SF Home, 1949 3360 7. 000720-0060 409 S Tobin St District Warehouse, 1964 27,500 8. 000720-0079 418 S Tobin St SF Home, 1997 1,080 9. 000720-0110 500 S Tobin St SF Home, 1902 1,210 10. 000720-0114 504 S Tobin St SF Home, 1902 2,250 11. 000720-0060 400 S 2nd St Renton High School 290,346 Total Existing Structure Sizes 358,020 The structures associated with the existing high school are as follows: • Main Classroom Building: 84,749 SF • West Wing Addition: 68,627 SF • East Wing Addition: 35,145 SF • Gymnasium: 85,025 SF • IPAC Theater: 16,800 SF d. Will any structures be demolished? If so, what? With the exception of the following, all of the above structures will be demolished: • Main Classroom Building (1931): 84,749 SF • IPAC Theater: 16,800 SF e. What is the current zoning classification of the site? The site where the existing RHS is located is zoned CD (Center Downtown), along with properties adjacent to Logan Ave S, into which area the RHS campus is proposed to expand. The north parcels along Airport Way are zoned CA (Commercial Arterial). There SEPA Environmental checklist September 2023 Page 23 (WAC 197-11-960) is a short block between S Tobin St and S Tillicum St that is zoned R-8 (Residential-8). Additionally, there are five overlay zones in the project area: Urban Design District A, Urban Design District D, Airspace Protection Zone, Downtown Business District and City Center Sign Regulation Area. Figure 2 - Zoning Map f. What is the current comprehensive plan designation of the site? The comprehensive plan designation is Commercial Mixed Use, with the exception of the residential zoning between S Tobin St and S Tillicum St, which is designated Residential Medium Density. The property is within the City Center Subarea, Regional Employment Subarea, and the PSRC-designated Regional Growth Center. The south and east portions are in the Civic Core Vision and Action Plan area. g. If applicable, what is the current shoreline master program designation of the site? The site is not within a shoreline jurisdiction. h. Has any part of the site been classified as a critical area by the city or county? If so, specify. City of Renton: High Seismic Hazard, Wellhead Protection Area Zone 1 and 2. i. Approximately how many people would reside or work in the completed project? No persons will reside in the project area. Employment is expected to remain at current levels in the near term but increase in the long term to approximately 120 full time and 30 part time staff. SEPA Environmental checklist September 2023 Page 24 (WAC 197-11-960) j. Approximately how many people would the completed project displace? Renton School District has acquired residential properties, and the residents have been or will be relocated. For this Phase 3 of the Renton High School Replacement and Site Expansion SEPA process, the project will result in the displacement of 8 residential units, or approximately 20 people (according to the US Census average household size for Renton). k. Proposed measures to avoid or reduce displacement impacts, if any. The owners were compensated fairly for the purchase of the properties and the residents were provided with assistance for relocation. There are no other proposed measures to avoid or reduce displacement impacts. l. Proposed measures to ensure the proposal is compatible with existing and projected land uses and plans, if any. The new classroom building is located on S 2nd St and close to the corner of Logan Ave S, a pedestrian street, consistent with the City requirements for the City Center Plan Area and the Urban Design Guidelines. A public gathering space is located around the main entry area with landscaping and seating. Wider pedestrian paths and sidewalks are provided, particularly along S 2nd St and Logan Ave S, where the bulk of the pedestrian activity is focused. Vehicle traffic is kept separate from school buses. m. Proposed measures to reduce or control impacts to agricultural and forest lands of long-term commercial significance, if any: None proposed, as no impacts are expected. 9. Housing a. Approximately how many units would be provided, if any? Indicate whether high, middle, or low-income housing. No housing is proposed. b. Approximately how many units, if any, would be eliminated? Indicate whether high, middle, or low-income housing. 8 housing units will be eliminated as part of the Phase 3 SEPA environmental review. These are middle income housing units. c. Proposed measures to reduce or control housing impacts, if any: The owners/residents were compensated fairly for the purchase of the properties and the residents were provided with assistance for relocation. There are no other proposed measures to reduce or control housing impacts. SEPA Environmental checklist September 2023 Page 25 (WAC 197-11-960) 10. Aesthetics a. What is the tallest height of any proposed structure(s), not including antennas; what is the principal exterior building material(s) proposed? The tallest building will be the new high school building which will be approximately 65 feet in height to the top of the mechanical penthouse. (48 feet average height of highest roof). It will be comprised of building materials that are complementary with the new and the existing buildings on site. Materials will include two blends of masonry bricks (varied tones), metal panels, corrugated metal siding and glazing systems including aluminum curtain wall and storefront. The athletic fields in the northeast corner of the site will have field lighting. The pole heights will vary from 46 to 75 feet, inclusive of anticipated FAA-required obstruction lights. b. What views in the immediate vicinity would be altered or obstructed? Views will change slightly as a result of removing and replacing fields, structures and parking lots with new facilities and landscaping. No views will be obstructed by the proposal. The new portion of the high school building will be relocated to front along S 2nd St and Logan Ave S and new ballfields will be added to the northwestern portion of the property that has historically been comprised of a mix of residential and commercial uses. c. Proposed measures to reduce or control aesthetic impacts, if any: The site and building have been designed to meet the City of Renton’s Urban Design District A and D requirements. Building materials will be of high quality and complementary with the new and existing buildings on site. Materials will include two- tones of masonry bricks, metal panels, corrugated metal siding and various high quality glazing systems including curtain wall and storefront. These materials will also be detailed and organized in an overall complimentary manner that organizes the composition of the facades to represent the building internal program and uses. The building façade has been modulated and articulated to break up the bulk and massing of the building. 11. Light and glare a. What type of light or glare will the proposal produce? What time of day would it mainly occur? Light and glare will generally occur during the early evening hours, consistent with what is present on the current campus, and what is expected of a similar use. The buildings, parking lots and pathways will be lit for safety and security after dusk. The athletic SEPA Environmental checklist September 2023 Page 26 (WAC 197-11-960) fields will be lit when they are in use from dusk until approximately 10pm during the darker months of the year. Street/sidewalk lighting will be provided in accordance with city requirements. b. Could light or glare from the finished project be a safety hazard or interfere with views? Careful consideration has gone into the location and height of the field lighting given Renton High School’s location within the Renton Municipal Airport’s Runway Protection Zone to prevent a safety or obstruction hazard for airplanes approaching the runway. The District will be submitting to the FAA several Form 7460-I’s No Hazard Evaluations for each light pole location, which are anticipated to result in receipt of “no hazard” Obstruction Evaluations (OE). It is likely that special treatments of the poles may be needed to improve pilot safety, such as special painting or beacons to enhance visibility. An FAA representative has explained that they are most concerned with the height of the poles than they are with the lights on the poles. One other potential safety hazard would be related to light spill from the field lights to adjacent rights of way and impacts to driver safety. The lighting study demonstrates that the light spill to the adjacent roadways will fall within the acceptable levels provided in Renton Municipal Code (RMC) 4-6-060.I.3. Light spill at the residential property line (east of Logan Ave and western extents of Tobin Ave S) is predicted to be less than 0.05 footcandles. c. What existing off-site sources of light or glare may affect your proposal? This proposal is in downtown Renton, and close to the Renton Municipal airport, with the light and glare associated with airport, traffic and urban uses. Light and glare will not be affected by the proposal. d. Proposed measures to reduce or control light and glare impacts, if any: The site and field lighting was carefully designed to minimize potential impacts to the airspace, adjacent rights of way, and adjacent/nearby properties. The field lights will be specifically aimed to the field areas and the fixtures themselves will be shielded to ensure downcast lighting. Additionally, lighting will be turned off by 10 pm when in use during the darker months of the year. See the lighting design details and photometrics provided with the lighting study for additional information. SEPA Environmental checklist September 2023 Page 27 (WAC 197-11-960) 12. Recreation a. What designated and informal recreational opportunities are in the immediate vicinity? Currently RHS offers a multi-purpose field with baseball and softball diamonds and soccer goals, four tennis courts, and another dedicated softball field. Indoor recreation activities occur in the gymnasium and IKEA Performing Arts Center. Track, football and soccer athletes play at the nearby Renton Memorial Stadium. Additional nearby parks spaces include the Jones Logan Park, Jones Park and the trail along the Cedar River to the east of the site, which is less than .25 miles from the site. To the south are two small urban open spaces- Gateway Park and Piazza Park/Legacy Square. Cultural Centers nearby include the Renton Pavilion Events Center. b. Would the proposed project displace any existing recreational uses? If so, describe. No, the proposed project would not displace any existing recreational uses. The phasing of construction is designed to ensure that school sports will have use of the fields as needed. 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 recreation are anticipated. The proposal will enhance the school’s athletic fields by adding new types of recreation, using synthetic turf and field lighting to extend field use times, and converting fields to regulation sizes. The site expansion includes several new proposed recreational facilities that are designed to meet standards for competitive play (softball, baseball and multipurpose fields plus indoor basketball, volleyball and badminton courts) and will be open for public use outside of school hours including tennis courts, pickleball courts, and half- court basketball. The location of the existing ball fields in the western portion of campus will be renovated for track and field practice use only with no spectator seating and no lighting due to its location in the Runway Protection Zone for Renton Municipal Airport. 13. Historic and cultural preservation 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. This part of Renton was developed around the turn of the 20th century and there are many buildings on the Renton High School (RHS) site and in the vicinity that are over 45 years old, including the structures slated for demolition. Historical Research Associates, SEPA Environmental checklist September 2023 Page 28 (WAC 197-11-960) Inc. (HRA) prepared a Built Environment Inventory Report dated January 2025, which evaluated the RHS buildings including those recently acquired by the District and proposed for demolition. The HRA Built Environment Inventory Report (January 2025) recommends that four of the Renton High School buildings (the RHS main building, the RHS gym building, the District Warehouse building, and the West Playfield) qualify as contributing resources to a National Register of Historic Places (NRHP)-eligible historic district. Additionally, the RHS main building (built in 1931-1932) is individually NRHP-eligible. No other historic properties were identified. No properties are listed on the King County Register of Historic Places. The results of the survey and inventory were recorded in an inventory report (Beckner and Waldroop 2025), along with historic property inventory forms (HPIs) that were submitted via the Washington Department of Archaeology and Historic Preservation’s (DAHP’s) WISAARD database. Recommendations regarding the NRHP eligibility of surveyed resources were reviewed and concurred upon by DAHP reviewers. The following buildings associated with this Phase 3 SEPA evaluation are more than 45 years old: RHS Replacement and Site Expansion Phase 3 SEPA Properties/Structures Over 45 years Old Parcel Property Address Current Use Built Date Bldg. size (SF) 722930-0490 301-309 Airport Way Warehouse 1947 26,954 722930-0635 51 Logan Ave S SF Home 1916 1,820 569600-0185 103 Logan Ave S SF home 1938 1,470 000720-0034 300 – 302 S Tobin Duplex 1948 2,030 000720-0037 402 S Tobin St SF Home 1949 3360 000720-0060 409 S Tobin St District Warehouse 1964 27,500 000720-0110 500 S Tobin St SF Home 1902 1,210 000720-0114 504 S Tobin St SF Home 1902 2,250 000720-0060 400 2nd Ave RHS Main Building 1931-32 000720-0060 400 2nd Ave RHS West Wing Addition 1942-54, expanded 1964 68,627 000720-0060 400 2nd Ave RHS East Wing Addition 1969- 1977, expanded 2003 35,145 000720-0060 400 2nd Ave RHS Gymnasium 1958 85,025 SEPA Environmental checklist September 2023 Page 29 (WAC 197-11-960) There is one building located approximately 5 blocks southwest of Renton High School that is listed on both the County and National Register of Historic places: The F.W Woolworth Company store located at 724 S 3rd St and built in 1954. According to DAHP’s WISAARD mapping tool, there are several nearby buildings (within .25 miles) that have been determined eligible for listing in the NRHP but are not currently listed. This includes: • Chase Bank Building • Renton Lutheran Church • A Pontiac dealership • Duff, Edmund & Jane residence • Roxy Apartments • Stokes Mortuary • Evans, Harold and Nannie, House; Faull Renton Funeral home 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. The RHS campus and acquisition area has been investigated for the presence of archaeological resources many times as it is known to be the location of a former channel of the Cedar River and tribal occupation, as well as a former historic-period homestead. The RHS campus and vicinity have also been extensively modified throughout the twentieth century, with the construction of and modifications to RHS and its associated athletic fields and infrastructure, as well as development on residential and commercial properties north and east of the RHS campus. The District contracted with HRA to conduct cultural resources support for the project consisting of the development of an archaeological work plan, monitoring and inadvertent discovery plans (MIDPs) for different project activities, archaeological survey, and reporting (see the table below for the documents produced to date). HRA completed an archaeological report dated March 2025 (Warren et al. 2025) that encompassed the school campus and some of the SEPA Phase 1 and Phase 2 demolition properties. The survey included archival research, reviewing archaeological records in the WISAARD database and pedestrian and subsurface archaeological survey of the RHS properties. Two addendums to the report were prepared (Feb. and May 2025; McNulty Perez 2025a; Warren 2025) to evaluate and report on additional properties as they were acquired by the District. A third Addendum is anticipated to evaluate and report on more recently acquired properties and additional shovel probe survey on the current high school campus. HRA’s work has identified archaeological sites within the project’s area of impacts. SEPA Environmental checklist September 2023 Page 30 (WAC 197-11-960) Archaeological Plans and Inventory Reports Produced by HRA Document Title Citation Subject Type(s) of Survey Completed New Renton High School Archaeological Work Plan McNulty Perez and Kraemer 2024 This document provides the results of archival research, establishes an environmental and cultural context for the project, and outlines procedures for pedestrian survey, subsurface survey, archaeological monitoring, and archaeological reporting to be followed for the duration of the project. N/A Archaeological Monitoring and Inadvertent Discovery Plan for Geotechnical Boring for the Renton High School Project, King County, Washington Pickrell et al. 2024 This document outlines procedures for archaeological monitoring during geotechnical boring on the current Renton High School campus. N/A New Renton High School Archaeological Survey Report Warren et al. 2025 This document reports the results of pedestrian and subsurface survey on the current Renton High School campus and ten additional parcels acquired by Renton School District, as well as the results of archaeological monitoring. Pedestrian survey; subsurface survey; archaeological monitoring SEPA Environmental checklist September 2023 Page 31 (WAC 197-11-960) Archaeological Plans and Inventory Reports Produced by HRA Document Title Citation Subject Type(s) of Survey Completed New Renton High School Archaeological Report, February 2025 Fieldwork Addendum McNulty Perez 2025a This document reports the results of survey on seven additional parcels acquired by Renton School District, as well as the results of archaeological monitoring of geothermal well investigations. Pedestrian survey; subsurface survey; archaeological monitoring New Renton High School Archaeological Report, May 2025 Fieldwork Addendum Warren 2025 This document reports the results of survey on 11 additional parcels acquired by Renton School District. Pedestrian survey; subsurface survey Archaeological Monitoring and Inadvertent Discovery Plan for the Renton High School Project, King County, Washington McNulty Perez 2025b This document outlines procedures for archaeological monitoring of demolition activities on parcels adjacent to the present-day Renton High School campus. It discusses classes of anticipated archaeological finds and the appropriate treatment for each. N/A 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. Several methods have been used to assess potential impacts to cultural and historic resources on or near the project site, including the following: • The District sent an initial letter toDAHP, the Muckleshoot Tribe, Squaxin Island Tribe, Snoqualmie Nation, Stillaguamish Tribe, Suquamish Tribe, Tulalip Tribe and Duwamish Tribe in April 2024 notifying them of the project. • HRA began their evaluation of the built environment and archaeological resources on the site through the preparation of an Archaeological Work Plan (June 2024). SEPA Environmental checklist September 2023 Page 32 (WAC 197-11-960) The Work Plan was distributed to DAHP and the aforementioned Tribes, inviting them to review and comment on the work plan in advance of the survey. The following comments were received: o The Squaxin Island Tribal Historic Preservation Officer (THPO) confirmed that the Project is outside of the Squaxin Island Tribe’s traditional area and that no additional consultation with the Squaxin Island Tribe is necessary. o The Suquamish THPO reviewed and approved the methods in the work plan. o DAHP acknowledged receipt of the work plan. • For the Built Environment Inventory Report (January 2025), HRA conducted background research, survey, inventory, and impacts assessment to support cultural resources review under SEPA. HRA surveyed 34 built-environment resources and made recommendations for NRHP-eligible resources. The Built Environment Inventory Report was forwarded to DAHP for their review and archive in January 2025. HPIs were reviewed in the WISAARD database and recommendations of NRHP-eligibility were concurred upon. • The District sent an email on August 8, 2024, informing DAHP and the Tribes of the schedule for archaeological fieldwork between August 19 and 30, 2024, and inviting them to observe. No other responses were received in advance of the fieldwork. • On September 4, 2024, the Cultural Reservation Officer for the Duwamish Tribe requested a meeting with the District, HRA, and a representative of the City of Renton. The meeting occurred virtually on September 20, 2024, and the Tribe was on site during geothermal well investigations that occurred in October 2024. HRA and the District also informed them of the schedule for archaeological investigations that occurred on adjacent properties in October and December 2024, per her request. • For the Archaeology Report (March 2025) and two Addendums (Feb. and May 2025) HRA archaeologists conducted pedestrian and subsurface archaeological survey throughout the RHS campus and the adjacent properties as they were acquired. In total they excavated 74 shovel probes. The March 2025 Archaeology Report was distributed to the Tribes and DAHP for their review and comment on March 25, 2025. The two Addendums were uploaded to DAHP’s database (WISAARD) on June 10 and July 25, 2025. A third Addendum is in process. • HRA has been conducting archaeological monitoring during geotechnical boring, geothermal well investigations, pile cap investigations, irrigation line repair and demolition. The Tribes were notified and invited to monitor all site explorations and demolition. The results of the monitoring on the high school campus were SEPA Environmental checklist September 2023 Page 33 (WAC 197-11-960) incorporated into the existing report and addendums. The monitoring results for the demolition activities on adjacent properties will be the subject of a separate monitoring report. • Two confidential memorandums were prepared in July 2025, regarding the project’s potential impacts to archaeological resources. These memorandums were forwarded to DAHP and the Tribes on August 12, 2025, to facilitate a meeting and discussions about potential mitigation measures. To date, representatives from DAHP and the Duwamish Tribe have accepted the invitation to discuss potential mitigation measures at a meeting scheduled for September 10, 2025. • Comments received from DAHP and the Tribes during Archaeological Report review and the two prior SEPA phases include: • The Suquamish Tribe responded that they have no comments at this time. • The Duwamish Tribe has commented that they recommend an inadvertent discovery plan be in place, that they be contacted when archaeological work or monitoring is performed; that they would like to be present if or when an archaeologist is on site; and that they recommend that native trees, particularly culturally modified trees (CMTs), be preserved. The Tribe would like to be notified if any CMTs are found (note – no CMTs have been found). • The Snoqualmie Tribe responded that they have no substantive comments to offer at this time. They requested the opportunity to be onsite during ground disturbing activities for the Phase 2 SEPA. • DAHP has commented that they concur with the results and recommendations provided in the reports and provided additional mitigation measures (included in (d), below). 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. The following measures will avoid or minimize disturbance to resources: • The project will retain the oldest and most significant built-environment feature of the campus, the 1932 main building as well as the IKEA PAC. The later additions to the main building, the gym building, the warehouse and the playfield are to be demolished, which constitutes an adverse environmental impact under SEPA. In addition, the project will impact the Moses family homestead archaeological site, which has not been evaluated for listing in the NRHP. Three other historic-period debris scatters or concentrations that have not been evaluated for listing in the NRHP, and one historic-period debris scatter that HRA SEPA Environmental checklist September 2023 Page 34 (WAC 197-11-960) recommended as not eligible for listing in the NRHP, will also be disturbed by the project. Evaluation of the eligible-for-listing historic period sites will occur prior to disturbance. • The proposed new high school building is designed as a three-story structure with a penthouse level above the third floor. This multi-story design allows for a smaller and more efficient first-floor footprint, located in the southwestern portion of the campus. (The campus is located south of the Renton Municipal Airport, so it must adhere to height limitations imposed by the FAA and the City of Renton based on air space over the campus and also ground level restrictions associated with the Runway Protection Zone for the airport.) • The new building’s mechanical systems will not include a ground source heating system, which would have resulted in more extensive ground disturbance within the site. • Additionally, the District has come to an agreement with the City of Renton to limit the amount of utility work along Lake Ave S in the western portion of the campus, which also limits ground disturbance and potential impacts to resources. • The District is considering multiple opportunities to highlight the history and past land use on the property and in Renton more broadly to mitigate the Project’s impacts on the archaeological sites and historic built-environment properties within the campus. The District will be seeking input from DAHP and the Tribes on the measures prior to disturbance of these resources. The District has invited DAHP and the Tribes to a meeting on September 10, 2025, to begin this discussion. • Demolition on the newly acquired (SEPA Phase 3) parcels, the school buildings and all ground disturbing activities shall proceed with a monitoring and inadvertent discovery plan (MIDP) in place. The MIDP shall make it clear that no precontact archaeological resource(s) may be disturbed without a permit from DAHP and that no historic-period archaeological resource that is eligible for listing in the National Register of Historic Places (NRHP) may be disturbed without a permit from DAHP. The MIDP includes explicit expectations for what would make a historic-period site eligible for listing in the NRHP. • Per their request, the Duwamish Tribe and the Snoqualmie Tribe of Indians shall be notified prior to archaeological work or monitoring so that they can be present when an archaeologist is onsite. • In the event that additional cultural materials are identified during site disturbing activities that would change HRA’s interpretation of the historic-period archaeological sites’ NRHP eligibility, the activities shall be halted to allow HRA’s SEPA Environmental checklist September 2023 Page 35 (WAC 197-11-960) archaeologists to evaluate. If determined eligible for listing on the NRHP, a permit from DAHP will be required to conduct further work within the site(s) boundary. • Archaeological survey shall be conducted on the recently-acquired parcels (SEPA Phase 3 properties) as the District acquires/obtains access to them consistent with the Project’s archaeological work plan (McNulty Perez and Kraemer 2024). A third Addendum shall be prepared documenting the results of the additional study. The results of the additional archaeological survey(s) will be submitted to DAHP and the Tribes in advance of ground disturbing activities on the subject parcels. • Additional archaeological work shall be conducted to evaluate historic-period archaeological sites’ eligibility for listing in the NRHP and assess impacts from the project. • The recommendations provided by HRA in the future archaeological reports shall be followed during all soil disturbing activities. • Comments and mitigation requests provided by the Tribes and/or DAHP during all phases of SEPA review or review of the archaeological studies will be addressed. These may be documented in a memorandum of understanding (MOU) and/or mitigation plan with DAHP and the affected Tribes. • The District shall obtain a DAHP Archaeological Site Alteration and Excavation Permit for impacts to precontact sites and any NRHP-eligible or potentially eligible historic period sites. No potentially ground disturbing activities are allowed in these areas, including staging materials, parking vehicles, or using site areas to access other work locations, until a DAHP permit is acquired. 14. Transportation A Transportation Technical Report (Heffron Transportation, Inc., 2025) has been prepared for the proposed project. 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 school site and the expansion area are bounded by S 2nd St on the south; Logan Ave S on the east; Airport Way, S Tobin Stt, and residential properties on the north; and Lake Ave S, Shattuck Ave S, and private/commercial properties on the west. The school site currently has nine access driveways; seven are actively used by the school, and two that serve a gravel parking lot at the southwest corner are gated for construction staging. The largest main parking lot has one driveway on Logan Ave S (signed for “Buses Only”) and one driveway on S 2nd St (signed for “Student and Event Parking”). The automobile load/unload loop at the south side of the school has one entry driveway and one exit SEPA Environmental checklist September 2023 Page 36 (WAC 197-11-960) driveway both on the north side of S 2nd St. Parking along the west side of the school building is accessed from two driveways—one on S 2nd St signed “Staff Parking Only” and one on S Tobin St signed “Staff and Event Parking.” Finally, there is a service/delivery area on the north side of the campus with a driveway on S Tobin St, Within the expansion area the numerous residential and commercial properties have access driveways. The proposed project would reconfigure access and parking for the overall campus. The segments of S Tobin Stand S Tillicum St between Shattuck and Logan Avee S would be vacated to create a consolidated school property. The following describes the proposed changes to site access. • The easternmost access driveway on S 2nd St would be removed. The new expanded student and event parking lot would be accessed from two driveways—one located at the southwest corner of the site at approximately the location the existing playfield parking area egress driveway, and one new access on Lake Ave S. • Automobile load/unload would be retained at its existing on-site location but extended west to provide approximately three-times more curb-side load/unload space. The existing load-zone entry driveway on S 2nd St would be retained; the load-zone exit driveway would be located at an existing curb cut (currently serving as an entry-only driveway for the southwest parking area) opposite Shattuck Ave S. The other two existing site access driveways on S 2nd St would be removed. • School-bus load/unload would be relocated to a proposed new curb-side load zone along the west side of Logan Ave S for the entire length of the expanded school frontage extending between Airport Way and S 2nd St • Special education (SPED) buses would have an on-site load/unload area accommodated within the staff parking lot. • School-day access to and from the staff parking lot and SPED bus area would occur from a driveway that would form the east leg of the modified S Tobin St / Shattuck Ave S intersection. A secondary access driveway to/from the staff parking area is proposed as the east leg of the Logan Ave S / S Tobin St intersection. That driveway would remain closed (with gates) during the school day, but would be available for event-related access/egress and for emergency access. No other vehicular access driveways are proposed. All access driveways that serve the existing uses on the parcels that would be acquired and absorbed into the expanded site would be removed. SEPA Environmental checklist September 2023 Page 37 (WAC 197-11-960) 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? King County Metro (Metro) and Sound Transit provide bus transit service to and from the school’s vicinity. Metro serves the Renton High School directly at its stop located at the southwest corner of the site on the north side of S 2nd St. This stop has a shelter and is served by Metro Routes 101,106, 107, 160, and Rapid Ride F. The Renton Transit Center and City Center Parking Garage (655 S 2nd St) is located at the southeast corner of the S 2nd St / Logan Ave S intersection (about 500 feet from the school site). The Renton Transit Center is served by Sound Transit’s Routes 560 and 566 as well as Metro’s Routes 101, 105, 106, 107, 148, 153, 160, 240, 907, Rapid Ride F Line, and Access. There are also stops served by several of these routes located along Rainier Ave S, Logan Ave S, Renton Ave Extension, and S 3rd St. The City Center Parking Garage has about 560 stalls with free and paid public parking options depending on user needs and durations. Table 6 in the referenced TTR summarizes the transit service provided near the site. 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). The project would make right-of-way dedications, frontage improvements, and replace or install accessible curb ramps as required by the City of Renton. Frontage improvements would be constructed along the south side of Airport Way, Logan Ave S, S 2nd St, Lake Ave S, S Tobin Stand Shattuck Ave S. Some of the frontage improvements and/or accessible ramp upgrades would also involve traffic signal improvements such as pole relocations, pedestrian actuation improvements, and/or controller box upgrades. The frontage along the north side of S 2nd St would include right-of-way dedication and construction of a pedestrian walkway consistent with City of Renton requirements to accommodate the future S 2nd St Conversion Project. An enhanced pedestrian crossing is planned for Logan Ave S on the south side of S Tobin St. The new crossing is proposed to include a pedestrian actuated Rectangular Rapid Flashing Beacon (RRFB). The City required improvements along Shattuck Ave S would include curb bulb-outs with on- street parking. No other changes to the surrounding off-site roadway network 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 project would not use water, rail, or air transportation. However, Renton Municipal Airport is located directly north of the project site across Airport Way about 115 feet from the site expansion area. The Cedar River is located northeast of the site about 275 SEPA Environmental checklist September 2023 Page 38 (WAC 197-11-960) feet from the site expansion area and Lake Washington is located just over a mile north of the site. e. How many vehicular trips per day would be generated by the completed project or proposal? If known, indicate when peak volumes would occur and what percentage of the volume would be trucks (such as commercial and nonpassenger vehicles). What data or transportation models were used to make these estimates? The traffic analysis conducted for this SEPA Checklist, and detailed in the Transportation Technical Report reflected conditions with the Renton High School Replacement project complete and increased enrollment to its planned capacity of up to 1,600 students (a net increase of 211 students compared to the school’s current enrollment capacity). Based on daily trip generation rates published for high schools by the Institute of Transportation Engineers, the replaced and expanded school is estimated to generate a net increase of about 410 trips per day (205 in, 205 out). The peak traffic volumes would continue to occur in the morning just before classes begin (net increase of 114 trips between 6:45 and 7:45 A.M.) and in the afternoon around dismissal (net increase of 72 trips between 1:45 and 2:45 P.M.). During the most recent two academic years, the school was served by up to 15 full-size general education buses and 9 to 10 smaller special education (SPED) buses. With the proposed replacement school operating at full enrollment (1,600 students), the number of school buses could increase by 3 to 5; the number of SPED buses fluctuates annually based on student needs. Other truck trips expected to continue serving the site include deliveries of food and supplies, trash and recycling pick-up, and occasional maintenance. Overall, school buses and small trucks likely represent about 3 to 5 percent of the total daily traffic. For more information about the anticipated school traffic generation, refer to the Transportation Technical Report (Heffron Transportation, Inc., 2025). 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 proposal would not interfere with the movement of agricultural or forest products on streets in the area because no agricultural or working forest lands are located within the vicinity of the project site. g. Proposed measures to reduce or control transportation impacts, if any: The following physical and operational measures have been incorporated into the project for implementation during construction and prior to school opening. Roadway Network: Frontage Improvements The City will require frontage improvements along five adjacent streets. The following describes the requirements for each. SEPA Environmental checklist September 2023 Page 39 (WAC 197-11-960) • S 2nd St – The project will only provide a dedication for future S 2nd St improvements that will be made by the City as part of its planned future roadway improvements in that segment. A waiver will be completed to exempt the school project from S 2nd St improvements. On-site and north of S 2nd St, the project will provide walkway connections between the automobile load/unload loop and the school buildings within the site. • Airport Way – A new 8-foot-wide planting strip will be provided adjacent to the back of the existing curb. The project will construct an 8-foot-wide sidewalk adjacent to the planting strip. • Shattuck Ave S – New curb and gutter will be installed 15 feet from the roadway centerline. An 8-foot-wide planting strip will be provided adjacent to the back of the new curb and a new 5-foot-wide sidewalk will be constructed adjacent to the planting strip. • S Tobin St–An 8-foot-wide planting strip will be provided adjacent to the back of the existing curb. The project will construct a new 5-foot-wide sidewalk adjacent to the planting strip. • Lake Ave S – An 8-foot-wide planting strip will be provided adjacent to the back of the existing curb. The project will construct a new 5-foot-wide sidewalk adjacent to the planting strip. • Logan Ave S – The existing roadway pavement 20-feet from roadway centerline will remain. A new 14-foot-wide roadway pavement section will be constructed with a new 8-foot-wide school-bus load/unload and parking area. New curb and gutter will be constructed with a new 12-foot-wide sidewalk and street trees within grates. Roadway Network: Off-Site Improvements In addition to the required frontage improvements, the project will make off-site improvements at several locations as described below. • S 2nd St / Logan Ave S Intersection –The project will install two new curb ramps and a new curb-bulb at the northwest corner; two new curb ramps at the northeast corner; and a single curb ramp at the southwest corner. The existing southeast curb ramp will be retained. • S Tobin St / Logan Ave S Intersection – The project will construct new curb bulbs on both sides of Logan Ave S north and south of the S Tobin St intersection. It will also construct north/south curb ramps for the crosswalk on the east leg and east/west curb ramps for a new crosswalk on the south leg. The west leg of the intersection will be constructed as a new school site driveway. The project will install an RRFB at the new crosswalk on the south leg the intersection for pedestrian crossings between the school and the east side of Logan Ave S. SEPA Environmental checklist September 2023 Page 40 (WAC 197-11-960) • Airport Way / Logan Ave S Intersection – The project will construct a new curb ramp and a curb-bulb at the southwest corner of the intersection. The other elements of the intersection will remain unchanged. • Airport Way / Shattuck Ave S Intersection – The project will construct a new curb ramp and curb-bulb at the southeast corner of the intersection. The other corners of the intersections will remain unchanged. • S Tobin St / Shattuck Ave S Intersection – The project will construct two curb ramps (one for north-south crossings, and one for east-west crossings) and new curb-bulbs at the northwest corner of the intersection. It will construct a curb ramp and new driveway entrance into the site on the east side of the intersection. A curb ramp will also be constructed at the southwest corner. • S 2nd St/ Lake Ave S Intersection – The project will construct a curb ramp at the northeast corner of the intersection to serve crossings of S 2nd Ave to the south. The southwest, southeast, and northwest corner will remain unchanged. Roadway Network: Roadway and Curb Signage Due to the school site expansion, the District will coordinate with the City to confirm the new equipment required as well as the locations and enforcement times for school-zone signage and flashing beacons, especially at and around the expanded portions of the campus. The District will also coordinate with the City on signage and restrictions for the school-bus load zone proposed along the west side of Logan Ave S between Airport Way and S 2nd St. Operational Measures: Short-Term Conditions – Construction A. Construction Management Plan (CMP) – The District will continue working with the selected contractor to refine the CMP that addresses traffic and pedestrian access control during school construction for each major phase. It will confirm truck routes, lane closures, walkway routes and closures, and parking disruptions, as necessary. The CMP may also include measures to keep adjacent streets clean on a daily basis at the truck exit points (such as street sweeping or on-site truck wheel cleaning) to reduce tracking dirt off site. The CMP will identify parking locations for the construction personnel, students, staff, and load/unload areas for school buses and passenger vehicles during peak arrival and dismissal periods. It will also include measures to minimize or avoid truck access/egress and deliveries during school peak arrival and dismissal periods. During phases when on-site parking is limited, outside user- group events at the Ikea Performing Arts Center (IPAC) may need to be limited or restricted. Those events may occur if off-site parking can be SEPA Environmental checklist September 2023 Page 41 (WAC 197-11-960) arranged such as through a shared-parking agreement with the City Center Parking Garage. Operational Measures: Long-Term Conditions – Operations B. Transportation Management Plan (TMP) – Prior to the school opening, the District and school principal will establish a Transportation Management Plan (TMP) to educate families about the access load/unload procedures for the site layout. It will encourage school bus ridership, use of public transit, carpooling, and walking or biking. The plan will define clear procedures and travel routes for family vehicles and instruct family drivers not to block or partially block travel lanes with queued or waiting vehicles. The plan will also address evening event conditions by identifying appropriate parking locations for attendees, and or adjusting the schedule or size of events to better accommodate demand with the available parking supply. C. Event Parking Management – It is recommended that the school monitor concurrent scheduling of the IPAC, black box theater, and other assembly spaces (such as the gymnasium during varsity basketball games) to determine if parking demand could exceed the on-site supply and to determine if management measures may be required. Options for parking management during multiple concurrent events may include directing attendees to off-site parking (such as the City Center Parking Garage at the southeast corner of the S 2nd St / Logan Ave S intersection about 500 feet from the school site). 15. Public services 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. No, there shouldn’t be an increased need for public services associated with this project. b. Proposed measures to reduce or control direct impacts on public services, if any. No proposed measures to reduce impacts on public services are proposed. 16. Utilities a. Circle utilities currently available at the site: electricity, natural gas, water, refuse service, telephone, sanitary sewer, septic system, other: SEPA Environmental checklist September 2023 Page 42 (WAC 197-11-960) 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. • Electricity: PSE • Natural Gas: PSE • Water: City of Renton • Refuse: Republic Services • Sanitary Sewer: City of Renton C. Signature The above answers are true and complete to the best of my knowledge. I understand that the lead agency is relying on them to make its decision. X Type name of signee: Lisa Klein Position and agency/organization: Associate Principal / AHBL Date submitted: September 16, 2025