Loading...
HomeMy WebLinkAboutSR_ERC_Report_Taxiway_A_241121_v3_FINALDEPARTMENT OF COMMUNITY AND ECONOMIC DEVELOPMENT Project Location Map SR_ERC Report_Taxiway A_241120_v1 ENVIRONMENTAL REVIEW COMMITTEE REPORT ERC Meeting Date: November 25, 2024 Project File Number: PR24-000051 Project Name: Taxiway A Reconstruction/Rehab and Associated Improvements Land Use File Number: LUA24-000208, ECF, SME Project Manager: Alex Morganroth, Principal Planner Applicant/Contact: William Adams, Civil Engineer 3, 1055 S Grady Way Renton, WA 98057 Owner: City of Renton, 1055 S Grady Way Renton, WA 98057 Project Location: 616 W Perimeter Rd (APNs 0723059007 & 0723059096) Project Summary: The applicant, the City of Renton, is proposing a variety of maintenance and improvement projects on Taxiway A at the Renton Municipal Airport site located at 616 W Perimeter Rd (APNs 0723059007 and 0723059096). The airport site totals 152.5 acres in area and is located within the Medium Industrial (IM) and Heavy Industrial (HI) zone. The entire site is within the Comprehensive Plan Employment Area land use designation. The proposed work is primarily located within Taxiway A and adjacent connector taxiways (A1, A2, A3, A4, A5, A6, and A7) and infield areas on the western portion of the site. Improvements proposed include airfield pavement rehabilitation, service road rehabilitation, drainage improvements, lighting upgrades, signage upgrades, and a water line upgrade. According to the applicant, the proposed in-field grading would result in approximately 2,659 cubic yards (CY) of cut and 1,714 CY of fill. Approximately 17.7 acres of existing asphalt is proposed for rehabilitation. A high seismic hazard area, high erosion hazard area, regulated slopes, a Special Flood Hazard Area, and Downtown Wellhead Protection Area Zones 1 and 2 are mapped on the site according to COR Maps. In addition, the proposed improvements are located within Reach J of Lake Washington with an Environmental Designation of Shoreline High Intensity. Lake Washington is classified as a Shoreline of the State (Type S). No in-water work is proposed. No increase in impervious surface is proposed. No trees are proposed for removal. The applicant submitted a geotechnical report, drainage report, lake and stream study, and an Environmental (SEPA) Checklist with the application. Exist. Bldg. Area: N/A Proposed New Bldg. Area (footprint): Proposed New Bldg. Area (gross): N/A N/A Site Area: 6,640,728 SF Total Building Area GSF: N/A STAFF RECOMMENDATION: Staff Recommends that the Environmental Review Committee issue a Determination of Non-Significance - Mitigated (DNS-M). Docusign Envelope ID: E0F8843B-A22A-4BE7-8E8C-B885793CB9BA City of Renton Department of Community & Economic Development Taxiway A Reconstruction/Rehab and Associated Improvements Staff Report to the Environmental Review Committee LUA24-000208, ECF, SME Report of November 20, 2024 Page 2 of 8 SR_ERC Report_Taxiway A_240731_DRAFT ENVIRONMENTAL REVIEW In compliance with RCW 43.21C.240, the following environmental (SEPA) review addresses only those project impacts that are not adequately addressed under existing development standards and environmental regulations. A. Environmental Threshold Recommendation Based on analysis of probable impacts from the proposal, staff recommends that the Responsible Officials: Issue a DNS-M with a 14-day appeal period B. Mitigation Measures 1. The applicant shall comply with the recommendations found in the submitted HWA Geotechnical Report, prepared by HWA Geosciences, Inc., dated April 26, 2024, and any future addenda. 2. The applicant shall prepare a narrative outlining mitigation measures to address hazardous waste operations worker training, a health/safety plan, and site control requirements, per WAC 296-843. The narrative shall be submitted to the Current Planning Project Manager for review and approval prior to issuance of a civil construction permit. 3. The applicant shall submit an Archaeological Monitoring and Inadvertent Discovery Plan (MIDP) to the Department of Archaeology and Historic Preservation (DAHP) and any interested tribes for review prior to the start of any ground disturbing activities. Documentation of the submittal shall be provided to the City of Renton prior to the issuance of building or construction permits. C. Exhibits Exhibit 1: Environmental Review Committee (ERC) Report Exhibit 2: SEPA Checklist Exhibit 3: Site Plan Exhibit 4: Civil Construction Plans Exhibit 5: Erosion Control and Storm Drainage Plans Exhibit 6: Construction Mitigation Narrative, prepared by Century West Engineering Corporation (Century West), dated May 13, 2024 Exhibit 7: Geotechnical Report, prepared by HWA GeoSciences Inc., dated April 26, 2024 Exhibit 8: Draft Stormwater Technical Information Report, prepared by Kimley-Horn and Associates, Inc., dated May 13, 2024 Exhibit 9: Lake Study and Habitat Data Report, prepared by ESA, dated April 2024 Exhibit 10: Duwamish Tribe Comments, dated July 9, 2024 Exhibit 11: City Response to Duwamish Tribe Comments, dated July 10, 2024 Exhibit 12: Washington Department of Ecology Comment, dated July 19, 2024 Exhibit 13: City Response to Washington Department of Ecology Comment, dated July 19, 2024 Exhibit 14: Advisory Notes D. Environmental Impacts The Proposal was circulated and reviewed by various City Departments and Divisions to determine whether the applicant has adequately identified and addressed environmental impacts anticipated to occur in conjunction with Docusign Envelope ID: E0F8843B-A22A-4BE7-8E8C-B885793CB9BA City of Renton Department of Community & Economic Development Taxiway A Reconstruction/Rehab and Associated Improvements Staff Report to the Environmental Review Committee LUA24-000208, ECF, SME Report of November 20, 2024 Page 3 of 8 SR_ERC Report_Taxiway A_240731_DRAFT the proposed development. Staff reviewers have identified that the proposal is likely to have the following probable impacts: 1. Earth Impacts: The 6,640,728 square foot (152.5 acres) subject property is currently developed with a municipal airport including a runway, taxiways, apron areas, and a variety of buildings and uses associated with aviation. Work proposed includes the reconstruction or rehabilitation of pavement along Taxiway A and connector areas, Taxiways A1 through A7, Apron Service Road, and the seaplane ramp (Exhibits 3 and 4). In addition, the applicant proposes to widen and pave taxiway shoulders along the connecter taxiways and portions of Taxiway A, upgrade lighting, and replacement or removal of various fire lines, and infield drainage improvements. The site topography is almost completely flat with a grade change of approximately three percent (3%) across the property. City of Renton (COR) Maps has identified a High Seismic Hazard Area, regulated slopes, and a High Erosion Hazard on the site. As such, the applicant submitted a Geotechnical Report, prepared by HWA Geosciences, Inc., dated April 26, 2024, with the application (Exhibit 7). A total of 17.1 acres of excavation and pavement rehabilitation is proposed across the site. Work proposed by the applicant would result in approximately 2,659 cubic yards (CY) of cut and 1,714 CY of fill. The project site, located in the Puget Lowland, has a geology shaped by repeated glacial advances and retreats during the Quaternary ice ages, along with sediment accumulation from the Olympic and Cascade Mountains. The project site is primarily underlain by soft or loose alluvial silt, clay, sand, and gravel, along with wetland deposits of organic silt and peat, reflecting historic Lake Washington water levels and nearby rivers. East of the site, alluvium is mapped near modified land and fill soils in the Renton Landing area. To the west, Vashon glacial till, glaciofluvial kame terrace deposits, and undifferentiated glacial deposits are present along the hillside and may also underlie the alluvial deposits at Renton Municipal Airport. The geotechnical engineer completed a geotechnical investigation during multiple time periods in June and September of 2023. The investigation program included the drilling of 25 geotechnical borings along Taxiway A, the associated taxiway connectors, and the seaplane ramp on the north side of the site using a truck-mounted sonic drill rig. All borings completed for the geotechnical engineering study were excavated to depths of approximately 11.5 feet (11.5’). In addition, according to the Geotechnical Report, the consultant completed pavement coring in approximately 23 locations to depths of approximately 1.5 to 2 feet (1.5-2’) below pavement surface using a 6-inch (6”) diameter, trailer hitch mounted, electric core drill. The intent of the coring was to evaluate pavement thickness across the site. Falling Weight Deflectometer testing was completed along Taxiway A and the various connectors using a Dynatest Model 8012 Fast Falling Weight Deflectometer in order to test the pavement under a wide range of loading conditions in order to simulate typical airport conditions. Lastly, test pit explorations were completed along the infield and between Runway 34/16 and Taxiway A. The consultant excavated 22 test pits and one (1) small scale Pilot Infiltration Test (PIT) with a mini excavator in order to log soil stratigraphy, texture, and groundwater occurrence. Test pits were dug to a depth of between one foot (1’) and 2.5 feet (2.5’). According to the Geotechnical Report, buried hot-mix asphalt (HMA) and Portland cement concrete (PCC) pavement layers were found in 14 of 25 borings and 13 of 23 pavement cores, extending up to 35 inches (35”) below the surface in some locations, such as boring B-18. The report notes that these pavements included crushed base layers and were paved with HMA before burial, reflecting site development over time. Below the buried pavement, fill soils of gravel or sand with varying silt content were placed during the Boeing Plant and Renton Municipal Airport construction (1941–1945). Fill thickness averaged five feet (5’) under Taxiway A, with the thickest layers (9.5 to 11.5+ feet) in borings B-16 and B-14 and the thinnest (2 to 3 feet) in other borings. Fill soils overlay alluvial deposits from Lake Washington, the Black River, and the Cedar River, with the thickest fill likely in the infilled Black River channel and the airport's northern areas according to the report. Docusign Envelope ID: E0F8843B-A22A-4BE7-8E8C-B885793CB9BA City of Renton Department of Community & Economic Development Taxiway A Reconstruction/Rehab and Associated Improvements Staff Report to the Environmental Review Committee LUA24-000208, ECF, SME Report of November 20, 2024 Page 4 of 8 SR_ERC Report_Taxiway A_240731_DRAFT Groundwater was observed in most borings and test pits, with depths ranging from 4 to 9.5 feet (4-9.5’) in borings and 4.8 to 8.6 feet (4.8-8.6’) in test pits. The average groundwater elevation is about 18.4 feet (18.4’) across the site, with the deepest at 14.1 feet (14.1’) (TP-14) and the shallowest at 21.7 feet (21.7’) (B-1). Groundwater elevation generally decreases northward toward Lake Washington, likely influenced by recharge from the southern airport area, including the buried Black River channel and Cedar River groundwater. The report notes that groundwater typically occurs within permeable alluvial soils, and the undulating nature of the alluvial surface beneath the fill may be controlling groundwater elevation. The report concludes that the results of the explorations and laboratory testing indicate a considerable variation in pavement layer types, thicknesses, and subgrade support conditions across the Renton Municipal Airport site. Recommendations for the project contained within the report include those related to subgrade stabilization, drainage, wet-weather earthwork, and temporary excavations. As such, staff recommends a mitigation measure that the applicant be required to comply with the recommendations found in the submitted Geotechnical Report, prepared by HWA Geosciences, Inc., dated April 26, 2024, and any future addenda. Mitigation Measure: The applicant shall comply with the recommendations found in the submitted HWA Geotechnical Report, prepared by HWA Geosciences, Inc., dated April 26, 2024, and any future addenda. Nexus: State Environmental Policy Act (SEPA) Environmental Review; City of Renton Comprehensive Plan Policy L-36; RMC 4-3-050 Critical Areas Regulations; and RMC 4-4-060 Grading, Excavation, and Mining Regulations. 2. Air Impacts: It is anticipated that some temporary air quality impacts could be associated with site work and required to complete the proposed project at this site. Project development impacts during construction activities may include dust as a result of the concrete/asphalt cutting, grading, and paving, as well as exhaust from construction vehicles, equipment and/or machinery. These emissions would be temporary and are anticipated to rapidly dissipate. Dust control would be mitigated through the use of temporary erosion control measures, watering, or other best management practices (Exhibit 5). Mitigation Measures: No mitigation recommended. Nexus: Not applicable. 3. Water a. Storm Water Impacts: The applicant submitted a Draft Stormwater Technical Information Report, prepared by Kimley- Horn and Associates, Inc., dated May 13, 2024 (Exhibit 8). The project contains greater than 2,000 square feet of new and replaced impervious surface and therefore the development is subject to Full Drainage Review in accordance with the 2022 Renton Surface Water Design Manual (RSWDM). Based on the city’s flow control map, this site falls within the Peak Rate Flow Control Standard (Matching Existing Peak Conditions). The site falls within the West Lake Washington – Seattle South Basin. All nine (9) core requirements and the six (6) special requirements have been discussed in the TIR. According to the submitted preliminary TIR, the proposed rehabilitation adds no new impervious surface, but does result in the replacement of approximately 17 acres of impervious surface. A Level 1 downstream analysis was completed as shown in the TIR. As currently designed, stormwater runoff from the airport is collected by a series of catch basins/manholes, which then enters the Black River culvert under the airport's W Perimeter Rd. The Black River culvert flows from south to north and discharges stormwater into Lake Washington. The applicant contends that since no new impervious surfaces are to be added as part of the proposed project, no drainage or water quality issues are predicted to arise as part of the proposed project. Staff reviewed the applicant’s analysis and concurs with applicant. Docusign Envelope ID: E0F8843B-A22A-4BE7-8E8C-B885793CB9BA City of Renton Department of Community & Economic Development Taxiway A Reconstruction/Rehab and Associated Improvements Staff Report to the Environmental Review Committee LUA24-000208, ECF, SME Report of November 20, 2024 Page 5 of 8 SR_ERC Report_Taxiway A_240731_DRAFT The applicant has proposed a significant amount of storm drainage pipe replacement across the Taxiway, in-field area, and various connectors. The preliminary TIR indicates the new pipes proposed are in-kind replacements of existing pipes and therefore no analysis of the current system was completed. Since no new impervious areas are added and there are no documented drainage issues on the site, the assessment is accepted for pipes matching the existing alignment, diameter, and slope. However, for new pipes differing in alignment, diameter, or slope, a backwater analysis, including the tailwater condition of Lake Washington, is required to be submitted with the Final TIR. The preliminary TIR indicates the project qualifies for a Surface Exemption for Transportation Redevelopment Projects under the 2022 RSWDM due to the project including new impervious surface being less than 50% of the existing impervious on the site, under 5,000 square feet of new pollution generating impervious surface (PGIS), and less than ¾ acre of new pollution generating pervious surface (PGPS). The report contends that as a result, no new water quality facilities are required. Staff has reviewed the analysis and concurs with the applicant. In addition, the preliminary TIR states that on-site BMPs like pervious pavement, rain gardens, and Low Impact Development features are not feasible within the airport's Air Operations Area due to FAA restrictions on wildlife-attracting BMPs and the unsuitability of pervious pavement for aircraft loading. Staff concurs with the assessment. A temporary Erosion and Sediment Control (ESC) plan and Construction Stormwater Pollution Prevention (CSWPP) is submitted with the land use application. Staff has reviewed the preliminary ESC plan and determined it is acceptable. A Construction Stormwater Permit from Department of Ecology is required since clearing and grading of the site exceeds one (1) acre. Applicant must obtain permit and provide proof prior to civil permit issuance. No further site-specific mitigation is recommended. Mitigation Measures: No mitigation recommended. Nexus: Not applicable. b. Ground Water Impacts: The COR mapping system has identified the property as located within the Downtown Wellhead Protection Zones 1 and 2. No work would occur in the Downtown Wellhead Protection Zone 1. Open facilities and open conveyance systems may require a liner in accordance with the 2022 Renton Surface Water Design Manual. The implementation of best management practices (BMPs) for stormwater control is preferable, and BMPs that rely on infiltration are allowed in Zone 2. Fill materials shall be from a verifiable source in order to ensure it is clear of contaminants. The city’s grading and excavation regulations require imported fill in excess of 50 cubic yards within a Wellhead Protection Zone 1, or within 100 cubic yards within a Wellhead Protection Zone 2, to provide a source statement certified by a qualified professional or confirm the fill was obtained from a Washington State Department of Transportation (WSDOT) approved source. Mitigation Measures: No mitigation recommended. Nexus: Not applicable. c. Wetlands, Streams, Lakes Impacts: Impacts: The project site is located along the western shore of the Cedar River and southern shore of Lake Washington, both Shorelines of the State. Therefore, the applicant submitted a Lake Study and Habitat Data Report, prepared by ESA, dated April 2024 (Exhibit 9). Reach A of the Cedar River shoreline is adjacent to the site and is designated as High Intensity. Reach J of the Lake Washington shoreline is adjacent to the site and is designated as High Intensity. No work proposed as part of the project would occur within 200 feet (200’) of the Cedar River ordinary high water mark (OHWM) and therefore no analysis related to the Cedar River was included in the Lake Study and Habitat Data Report. Portions of the project including pavement rehabilitation and drainage infrastructure replacement would occur within 200 feet (200’) of Lake Washington. Docusign Envelope ID: E0F8843B-A22A-4BE7-8E8C-B885793CB9BA City of Renton Department of Community & Economic Development Taxiway A Reconstruction/Rehab and Associated Improvements Staff Report to the Environmental Review Committee LUA24-000208, ECF, SME Report of November 20, 2024 Page 6 of 8 SR_ERC Report_Taxiway A_240731_DRAFT According to the Lake Study and Habitat Data Report, the project area consists mostly of paved concrete and asphalt with adjacent grass infields. West of the seaplane ramp, Lake Washington's shoreline lacks vegetation and is entirely paved for pedestrian access to seaplane docks. East of the ramp, a narrow riparian zone (20 feet or less) consists of shrubs and herbaceous groundcover mixed with fill material and broken concrete. The zone primarily contains invasive species such as Himalayan blackberry, reed canary grass, English ivy, butterfly-bush, and English holly, along with weedy groundcover like clover, plantain, and dandelions. No trees are present along the shoreline within 100 feet (100’) of the project area. The report notes that due to extensive development and disturbance, the riparian zone along Lake Washington within 100 feet (100’) of the project area provides minimal ecological functions. Functions may include limited nesting and foraging habitat for birds and small mammals, input of terrestrial insects and organic matter from vegetation, and minimal contributions to erosion control and habitat complexity. The lack of riparian vegetation on the western shoreline of Lake Washington, the narrow, invasive species- dominated riparian area on the eastern shoreline, and the highly developed nature of the area limit habitat availability for various plant and animal species. On March 21, 2024, two ESA biologists conducted a site visit to assess habitat conditions. According to the report, no mammals were directly observed, but small excavations made by squirrels were noted. The biologists noted that riparian areas along Lake Washington are likely used by small mammals such as raccoons, opossums, and muskrats, with nutria, an invasive rodent, also known to inhabit the area. Twenty (20) bird species, mostly waterfowl, were observed, including a bald eagle. The area is known to host 187 bird species. While no amphibians or reptiles were seen, species like frogs, salamanders, and turtles likely inhabit the area. No fish were observed, but Lake Washington supports various fish species, including five (5) salmonid species and federally listed species like Chinook salmon, steelhead, and bull trout. The report notes that the airport project proposes no alterations to habitat, as all work will occur within the built environment and would not involve in-water components or work below the Lake Washington OHWM. The project would not impact state or federally listed fish or wildlife species, nor the Pacific Flyway migratory corridor. Any temporary disturbance to infield grass areas during construction would be reseeded after completion. The report concludes that since the project is entirely within the built environment, it would result in no net loss of ecological function in the riparian zone of Lake Washington. Staff concurs with the findings and conclusion of the report. Mitigation Measures: No mitigation recommended. Nexus: Not applicable. 4. Environmental Health a. Hazards Impacts: The Washington State Department of Ecology’s (DOE) Spills and Cleanup map, as well as the SEPA Checklist (Exhibit 2) identifies a cleanup site at the Renton Municipal Airport, the Action Aviation site (ID# 6266). The site is associated with aviation facilities on the airport property. The site has the status of “awaiting cleanup”. The cleanup sites are outside of the Taxiway A project area and therefore would not be impacted by the proposed work. DOE submitted a comment related to two (2) other cleanup sites not identified in the SEPA checklist, including the Renton Municipal Airport Fire Training Area (ID#2546) and the Cedar River Trail (#2857). According to the comment, the sites were historically contaminated with metals, chlorinated volatile organic compounds (CVOCs), and polychlorinated biphenyls (PCBs). The comment specifically requests the applicant describe mitigation measures to address hazardous waste operations worker training, health/safety plan, and site control requirements, per WAC 296-843. Therefore, staff recommends as a mitigation measure, the applicant shall prepare a narrative outlining mitigation measures to address Docusign Envelope ID: E0F8843B-A22A-4BE7-8E8C-B885793CB9BA City of Renton Department of Community & Economic Development Taxiway A Reconstruction/Rehab and Associated Improvements Staff Report to the Environmental Review Committee LUA24-000208, ECF, SME Report of November 20, 2024 Page 7 of 8 SR_ERC Report_Taxiway A_240731_DRAFT hazardous waste operations worker training, a health/safety plan, and site control requirements, per WAC 296-843. The narrative shall be submitted to the Current Planning Project Manager for review and approval prior to issuance of a civil construction permit. Mitigation Measures: The applicant shall prepare a narrative outlining mitigation measures to address hazardous waste operations worker training, a health/safety plan, and site control requirements, per WAC 296-843. The narrative shall be submitted to the Current Planning Project Manager for review and approval prior to issuance of a civil construction permit. Nexus: WAC 296-843, DOE Comment Letter (Exhibit 12) b. Noise Impacts: The applicant submitted a Construction Mitigation Description with the application (Exhibit 6). The applicant proposes to complete the improvements in two (2) phases, with Phase 1 between May and September of 2025 and Phase 2 between June and August of 2026. Work is expected to occur between 7:00 a.m. and 5:00 p.m., Monday through Friday, with occasional weekend work. Weekend work would need to be approved in advance by the construction inspector and airport staff. No night work is proposed. Noise impacts would primarily result from the apron and parking lot rehabilitation work proposed on the site and associated heavy equipment. The construction noise would be regulated through the city’s adopted noise level regulations per Chapter 8-7, RMC. The city’s noise regulations limit haul hours between 8:30 a.m. to 3:30 p.m., Monday through Friday unless otherwise approved by the Development Services Division. Permitted work hours in or near residential areas are restricted to the hours between 7:00 a.m. and 8:00 p.m. from Monday through Friday. Work on Saturdays is restricted to the hours between 9:00 a.m. and 8:00 p.m. No work is permitted on Sundays. Temporary noise impacts are anticipated that would be commonly associated with the grading, paving, and utility trenching improvements. Mitigation Measures: No mitigation recommended. Nexus: Not applicable. 5. Historic and Cultural Preservation Impacts: In the SEPA Environmental Checklist (Exhibit 2), the applicant indicated there are no known Native American cultural resources present on the site. However, the applicant notes the project is located within the ancestral lands of the Duwamish people and therefore, there is a higher likelihood of cultural resources discovery through ground disturbing activity. According to the checklist, the Department of Archaeology and Historic Preservation (DAHP) Statewide Predictive Model classifies the airport site as Moderate to Very High Risk for containing precontact-era archaeological resources. In addition, the checklist identifies 15 recorded archaeological sites within one (1) mile of the airport, including six (6) precontact-era site and nine (9) historic-era sites as identified by DAHP. Two (2) of the archeological sites are within the airport site boundaries but outside of where the work would occur. A representative of the Duwamish Tribe submitted a comment letter (Exhibit 10) to city staff via email on July 9, 2024 indicating the project site is an area the tribe considers a high risk of containing archeological deposits. The Duwamish Tribe’s comment identifies the high potential for discovery of unknown archeological deposits and requests notification of any archeological work performed. In addition, the comment recommends the preparation of an archeological survey as advised by the DAHP WISAARD predictive model. According to the applicant, two (2) cultural resources surveys have been conducted less than 300 feet (300’) west of the airport, along Rainier Avenue: one for development of a section of the Lake Washington Loop Trail in 2016 and the other for sidewalk and road improvements along Rainier Avenue which also resulted in the identification and evaluation of historic resources including the Jolly Boy Drive In in 2020. Both surveys Docusign Envelope ID: E0F8843B-A22A-4BE7-8E8C-B885793CB9BA City of Renton Department of Community & Economic Development Taxiway A Reconstruction/Rehab and Associated Improvements Staff Report to the Environmental Review Committee LUA24-000208, ECF, SME Report of November 20, 2024 Page 8 of 8 SR_ERC Report_Taxiway A_240731_DRAFT directly west of the airport consisted of pedestrian and subsurface archaeological survey; no archaeological resources were identified as a result. Pursuant to RCW 27.53.060 and 27.44.020, if any Native American grave(s) or archaeological/cultural resources (Indian artifacts) are found, all construction activity shall stop and the owner/developer shall immediately notify the City of Renton Planning Department, concerned tribes’ cultural committees, and the Washington State Department of Archeology and Historic Preservation. Due to the potential presence of cultural resources on the site, staff recommends as a mitigation measure that the applicant be required to submit an Archaeological Monitoring and Inadvertent Discovery Plan (MIDP) to Department of Archaeology and Historic Preservation (DAHP) and any interested tribes for review prior to the start of any ground disturbing activities. Documentation of the submittal shall be provided to the City of Renton prior to the issuance of building or construction permits. Mitigation Measure: The applicant shall submit an Archaeological Monitoring and Inadvertent Discovery Plan (MIDP) to Department of Archaeology and Historic Preservation (DAHP) and any interested tribes for review prior to the start of any ground disturbing activities. Documentation of the submittal shall be provided to the City of Renton prior to the issuance of building or construction permits. Nexus: State Environmental Policy Act (SEPA) Environmental Review; City of Renton Comprehensive Plan Policies L-45; RCW 27.53 Archaeological Sites and Resources; and RCW 27.44 Indian Graves and Records. 6. Transportation Impacts: According to the applicant, the proposal would improve the existing Taxiway A and taxiway connectors (A1 – A7) which are publicly available to licensed aircraft pilots. The project includes trenching across W Perimeter Rd to provide for the reconfiguration of an existing fire waterline feed. Paving and trench restoration would comply with the City’s Trench Restoration and Overlay Requirements or Federal Aviation Administration (FAA) standards, whichever is greater. The impacts to W Perimeter Rd will be temporary and phased appropriately to reduce impacts to users. No additional transportation facility construction or improvements are proposed. No on-site parking would be impacted by the project and no new vehicle trips are anticipated. Therefore, no site-specific mitigation is recommended. Mitigation Measure: No mitigation recommended. Nexus: Not applicable. E. Comments of Reviewing Departments The proposal has been circulated to City Department and Division Reviewers. Where applicable, their comments have been incorporated into the text of this report and/or “Advisory Notes to Applicant” (Exhibit 14). ✓ Copies of all Review Comments are contained in the Official File and may be attached to this report. The Environmental Determination decision will become final if the decision is not appealed within the 14-day appeal period (RCW 43.21.C.075(3); WAC 197-11-680). Environmental Determination Appeal Process: Appeals of the environmental determination must be filed in writing on or before 5:00 p.m. on December 9, 2024. Appeals must be submitted electronically to the City Clerk at cityclerk@rentonwa.gov or delivered to City Hall 1st floor Lobby Hub Monday through Friday. The appeal fee, normally due at the time an appeal is submitted, will be collected at a future date if your appeal is submitted electronically. The appeal submitted in person may be paid on the first floor in our Finance Department. Appeals to the Hearing Examiner are governed by RMC 4-8-110 and additional information regarding the appeal process may be obtained from the City Clerk’s Office, cityclerk@rentonwa.gov. Docusign Envelope ID: E0F8843B-A22A-4BE7-8E8C-B885793CB9BA CITY OF RENTON DEPARTMENT OF COMMUNITY AND ECONOMIC DEVELOPMENT STAFF REPORT TO THE ENVIRONMENTAL REVIEW COMMITTEE EXHIBITS Project Name: Taxiway A Reconstruction/Rehab and Associated Improvements Land Use File Number: LUA24-000208, ECF, SME Date of Meeting November 25, 2024 Staff Contact Alex Morganroth Principal Planner Project Contact/Applicant William Adams, 1055 S Grady Way, Renton, WA 98057 Project Location 616 W Perimeter Rd (APNs 0723059007 & 0723059096) (APNs 0723059007 & 0723059096) The following exhibits are included with the ERC Report: Exhibit 1: Environmental Review Committee (ERC) Report Exhibit 2: SEPA Checklist Exhibit 3: Site Plan Exhibit 4: Civil Construction Plans Exhibit 5: Erosion Control and Storm Drainage Plans Exhibit 6: Construction Mitigation Narrative, prepared by Century West Engineering Corporation (Century West), dated May 13, 2024 Exhibit 7: Geotechnical Report, prepared by HWA GeoSciences Inc., dated April 26, 2024 Exhibit 8: Draft Stormwater Technical Information Report, prepared by Kimley-Horn and Associates, Inc., dated May 13, 2024 Exhibit 9: Lake Study and Habitat Data Report, prepared by ESA, dated April 2024 Exhibit 10: Duwamish Tribe Comments, dated July 9, 2024 Exhibit 11: City Response to Duwamish Tribe Comments, dated July 10, 2024 Exhibit 12: Washington Department of Ecology Comment, dated July 19, 2024 Exhibit 13: City Response to Washington Department of Ecology Comment, dated July 19, 2024 Exhibit 14: Advisory Notes Docusign Envelope ID: E0F8843B-A22A-4BE7-8E8C-B885793CB9BA