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HomeMy WebLinkAboutSR_ERC_Report_231009_v1DEPARTMENT OF COMMUNITY AND ECONOMIC DEVELOPMENT Project Location Map SR_ERC_Report_231009_v1 ENVIRONMENTAL REVIEW COMMITTEE REPORT ERC Meeting Date: October 9, 2023 Project File Number: PR23-000139 Project Name: SW Grady Office and Shop Building Land Use File Number: LUA23-000300, ECF, SA-A, MOD Project Manager: Clark H. Close, Principal Planner Owner/Applicant: Daniel Mendes, 1404 Grady LLC, 10650 9th Pl, Unit 1822, Bellevue, WA 98004 Contact: David Boileau, Sitts & Hill Engineers, Inc., 4815 Center St, Tacoma, WA 98409 Project Location: 1404 SW Grady Way, Renton, WA 98055 (APN 2423049061) Project Summary: The applicant is requesting administrative site plan review, environmental (SEPA) review, and a street modification to construct a 9,418 square foot one-story office and shop building at 1404 SW Grady Way (APN 2423049061). The subject property is approximately 27,175 square feet (0.62 acres) and is located within the Medium Industrial (IM) zoning designation. The applicant is proposing to retain the existing 1,520 square foot building during construction of the new building for material storage. After construction, the material would be relocated to the new building and the existing building would be demolished. In addition to the new building, the site work would include a vehicle parking, pedestrian walkway, landscaping, and other associated utility improvements. Access to the property is from SW Grady Way. The site is relatively flat. Grading would include 10 cubic yards of cut and 1,210 cubic yards of fill from a local gravel pit. The applicant is proposing a street modification to retain the existing curb and gutter, sidewalk, and landscaping along the project frontage. One (1) significant tree would be removed and replaced. The City’s mapping system has identified the subject property is within a high seismic hazard area and the northeast corner of the parcel in within the 100-year special flood hazard area (FEMA Zone – AE). The applicant submitted a geotechnical report, technical information report, traffic letter, and an arborist report. Exist. Bldg. Area SF: 1,520 SF Proposed New Bldg. Area (footprint): Proposed New Bldg. Area (gross): 9,418 SF 9,418 SF Site Area: 27,175 SF Total Building Area GSF: 12,138 SF STAFF RECOMMENDATION: Staff Recommends that the Environmental Review Committee issue a Determination of Non-Significance - Mitigated (DNS-M). City of Renton Department of Community & Economic Development SW Grady Office and Shop Building Staff Report to the Environmental Review Committee LUA23-000300, ECF, SA-A, MOD Report of October 9, 2023 Page 2 of 11 SR_ERC_Report_231009_v1 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 project construction shall comply with the recommendations found in the submitted Geotechnical Report, prepared by PanGEO Inc., dated July 2023 and any future addenda. 2. The applicant’s geotechnical engineer shall review the project’s construction and building permit plans to verify compliance with the geotechnical report(s). The geotechnical engineer shall submit a sealed letter stating that he/she has reviewed the construction and building permit plans and in their opinion the plans and specifications meet the intent of the report(s). 3. The applicant shall comply with the following recommendations found in the submitted letter from the Department of Ecology, dated September 27, 2023, prior to civil construction permit issuance: a. Sample the soil and analyze for arsenic and lead following the 2019 Tacoma Smelter Plume Guidance and send the soil sample results to Ecology for review. b. If lead or arsenic are found at concentrations above the Model Toxics Control Act (MTCA) cleanup levels (Chapter 173-340 WAC); the owners, potential buyers, construction workers, and others shall be notified of their occurrence. c. If lead, arsenic and/or other contaminants are found at concentrations above MTCA cleanup levels, the applicant shall: i. Develop soil remediation plan and enter into the Voluntary Cleanup Program with Ecology. ii. Obtain an opinion letter from Ecology stating that the proposed soil remediation plan will likely result in no further action under MTCA. The applicant shall provide to the local permitting agency the opinion letter from Ecology. iii. Prior to finalizing site development permits, provide to the local land use permitting agency “No Further Action” determination from Ecology indicating that the remediation plans were successfully implemented under MTCA. d. If soils are found to be contaminated with arsenic, lead, or other contaminants, extra precautions shall be taken to avoid escaping dust, soil erosion, and water pollution during grading and site construction. Contaminated soils generated during site construction shall be managed and disposed of in accordance with state and local regulations, including the Solid Waste Handling Standards regulation (Chapter 173-350 WAC). 4. Project construction activities that would result in soil disturbance below the existing fill material be completed under observation by a professional archeologist. All project disturbance activities shall be included in a project-specific monitoring plan upon completion of the final project design. Consultation with concerned Tribes shall occur prior to survey activities. City of Renton Department of Community & Economic Development SW Grady Office and Shop Building Staff Report to the Environmental Review Committee LUA23-000300, ECF, SA-A, MOD Report of October 9, 2023 Page 3 of 11 SR_ERC_Report_231009_v1 C. Exhibits Exhibit 1: Environmental Review Committee (ERC) Report Exhibit 2: Preliminary Site Plans (Interim and Final Phases) Exhibit 3: Neighborhood Detail Map Exhibit 4: Topographic Survey Exhibit 5: Overall Architectural Floor Plans Exhibit 6: Architectural Exterior Elevations Exhibit 7: Architectural Renderings Exhibit 8: Landscape Plans Exhibit 9: Arborist Report Exhibit 10: Tree Retention Plans Removal Plan Exhibit 11: Technical Information Report, prepared by Sitts & Hill Engineers, Inc., dated July 2023 Exhibit 12: Conceptual Grading and Drainage Plans (Interim and Final Phases), prepared by Sitts & Hill Engineers, Inc., dated February 1, 2023 Exhibit 13: Conceptual Utility Plan, prepared by Sitts & Hill Engineers, Inc., dated February 1, 2023 Exhibit 14: Geotechnical Report, prepared by PanGEO Inc., dated July 2023 Exhibit 15: Traffic Letter, prepared by Jake Traffic Engineering, Inc., dated June 19, 2023 Exhibit 16: Comment Email from the Duwamish Tribe, dated September 14, 2023 Exhibit 17: Staff Response to Duwamish Tribe, dated September 20, 2023 Exhibit 18: Comment Letter from Department of Ecology (Ecology), dated September 27, 2023 Exhibit 19: Staff Response to Ecology, dated September 27, 2023 Exhibit 20: Comment Letter from King County Department of Natural Resources and Parks – Wastewater Treatment Division (KCWTD), dated September 27, 2023 Exhibit 21: Staff Response to KCWTD, dated September 28, 2023 Exhibit 22: Environmental (SEPA) Checklist, dated August 21, 2023 Exhibit 23: Construction Mitigation Description Exhibit 24: Letter of Understanding of Geologic Risk Exhibit 25: Hazardous Materials Statement Exhibit 26: Transportation Concurrency Memo Exhibit 27: 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 the proposed development. Staff reviewers have identified that the proposal is likely to have the following probable impacts: City of Renton Department of Community & Economic Development SW Grady Office and Shop Building Staff Report to the Environmental Review Committee LUA23-000300, ECF, SA-A, MOD Report of October 9, 2023 Page 4 of 11 SR_ERC_Report_231009_v1 1. Earth Impacts: As provided in the applicant’s Geotechnical Report, prepared by PanGEO Inc., dated July 2023 (Exhibit 14) the project site is underlain by Quaternary Alluvium deposited by the White and Green Rivers. This soil unit generally consists of loose to medium dense sand and soft to medium stiff silt with occasional organic soil layer. According to the Report, field explorations consisted of drilling two (2) test borings at the site at approximately the northern and southern portions of the proposed building footprint. The borings generally encountered a layer of undocumented fill to a depth of approximately seven feet (7’) below the surface followed by alluvium consisting of loose to dense sand, gravelly, and silty sand with occasional organics and shell fragments. Groundwater was observed at about 15 feet below the ground surface. The Geotechnical Report evaluated potential geologic hazards (erosion hazards, steep slope and landslide hazards, seismic hazards, and coal mine hazards) within the subject site. The Report found erosion hazards at the site to be low and can be effectively mitigated with Best Management Practice (BMPs) during construction. No landslide or coal mine hazard areas were found at the site. Based on a liquefaction analysis, the alluvial soils below the groundwater table, to a depth of about 60 feet, are potentially liquefiable. It was determined that this could result in a post-liquefaction settlement of about 8 to 9 inches and a potential shear-induced liquefaction settlement below the foundation to be about 1 inch under an earthquake event. Assuming the potential differential settlement would be equal to about 50% of total post-liquefaction settlement, the geotechnical engineer estimates that the potential differential building settlement induced by liquefaction would be up to about 4 to 4½ inches, but more likely be less than 3 to 4 inches due to the uniform soils found in the borings. To mitigate the potential impacts of the soil liquefaction and ground settlement, the geotechnical engineer is recommending the proposed structure be supported by a mat/structural slab placed on 12-inch compacted structural fill (imported, well-graded, granular material, such as WSDOT CSBC or approved equivalent) over a layer of geogrid (such as Tensar BX1100 or approved equivalent), and the mat foundation should be thickened to a minimum depth of 18 inches below the adjacent finish grade around the perimeter of the mat and the thickened edges of the structural slabs should have a minimum width of 18 inches. Although, if a high-level foundation performance is desired by the applicant, pile foundation may be used to support the building. The applicant has indicated that they understand and would accept the risk of developing in an unstable area (Exhibit 24). The applicant anticipates approximately 10 cubic yards of excavation and approximately 1,210 cubic yards of fill to support the construction of the proposed development. The Geotechnical Report estimates that construction would require about three feet (3’) or less of excavation below existing grade or mainly fill underlain by loose to medium dense sand. Erosion is possible in conjunction with any construction activity. Implementation of a Temporary Erosion Sedimentation Control (TESC) plan would mitigate potential impacts from excavation activity. Managed erosion would include but not be limited to installing a silt fence at the construction perimeter, placing quarry spalls or hay bales at the disturbed and traffic areas, covering stockpiled soil or cut slopes with plastic sheets, construction of a temporary drainage pond to control surface runoff and sediment trap, and placing rocks at the construction entrance. Winter construction would require the implementation of best management erosion and sedimentation control practices to minimize the migration of sediment into private or public storm drainage systems (Exhibit 23). As the geotechnical study has confirmed the alluvial soils below the groundwater table are susceptible to seismically-induced liquefaction under IBC-code level earthquakes, and large ground settlement could occur as a result of soil liquefaction during the design seismic event, PanGEO Inc. recommends that their firm be retained to provide a review of the final design to confirm that their geotechnical recommendations have been correctly interpreted and adequately implemented in the construction documents. As such, staff recommends a mitigation measure that the applicant comply with the recommendations found in the submitted Geotechnical Report, prepared by PanGEO Inc., dated July City of Renton Department of Community & Economic Development SW Grady Office and Shop Building Staff Report to the Environmental Review Committee LUA23-000300, ECF, SA-A, MOD Report of October 9, 2023 Page 5 of 11 SR_ERC_Report_231009_v1 2023 and any future addenda. Additionally, as the geotechnical report was prepared prior to the final design of the project, staff recommends as a mitigation measure, that the applicant’s geotechnical engineer review the project’s construction and building permit plans to verify compliance with the geotechnical report(s). The geotechnical engineer shall submit a sealed letter stating that he/she has reviewed the construction and building permit plans and in their opinion the plans and specifications meet the intent of the report(s). Mitigation Measures: 1. The project construction shall comply with the recommendations found in the submitted Geotechnical Report, prepared by PanGEO Inc., dated July 2023 and any future addenda. 2. The applicant’s geotechnical engineer shall review the project’s construction and building permit plans to verify compliance with the geotechnical report(s). The geotechnical engineer shall submit a sealed letter stating that he/she has reviewed the construction and building permit plans and in their opinion the plans and specifications meet the intent of the report(s). 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 building construction required to develop this site. Project development impacts during construction may include dust as a result of grading and exhaust from construction vehicles and equipment. Dust control would be mitigated using temporary erosion control measures or other measures to remediate impacts as needed. According to the applicant, upon completion of the project, emissions from the site would be typical of a specialty trade contractor space that includes office and shop space to store/assemble materials for a job site (Exhibits 5 and 22). No further site-specific mitigation for the identified impacts from typical vehicle and construction exhaust is required. Mitigation Measures: No further mitigation is recommended. Nexus: Not applicable. 3. Water a. Wetland, Streams, Lakes Impacts: According to City of Renton (COR) Map, a small portion of the northeast corner of the site is located within a Special Flood Hazard Area Zone (100-year floodplain). The approximate location is shown on the site plan (Exhibit 2). The area of the site within the flood hazard zone (approx. 543 square feet) is proposed to be graded lower from the existing grade and a catch basin would be added to a low point. No new fill or buildings are proposed within that flood hazard zone. In addition, an on-site stormwater system is proposed to reroute stormwater to avoid contributing stormwater flows to the flood plain and neighboring properties, which is anticipated to reduce any potential occurrences of ponding or flooding problems on-site. According to the Technical Information Report, prepared by Sitts & Hill Engineers, Inc., dated July 2023 (Exhibit 11), there have not been any known flooding problems on-site. Mitigation Measures: No further mitigation is recommended. Nexus: Not applicable. b. Ground Water City of Renton Department of Community & Economic Development SW Grady Office and Shop Building Staff Report to the Environmental Review Committee LUA23-000300, ECF, SA-A, MOD Report of October 9, 2023 Page 6 of 11 SR_ERC_Report_231009_v1 Impacts: The proposed project is not within an Aquifer Protection Area Zone. No vehicles would be refueled on-site (Exhibit 25). No groundwater would be withdrawn for drinking water or other purposes. Groundwater was observed at about 15 feet below the ground surface. Groundwater elevations and seepage rates are likely to vary depending on the season, local subsurface conditions, and other factors. Groundwater levels are normally highest during the winter and early spring. Mitigation Measures: No further mitigation is recommended. Nexus: Not applicable. c. Storm Water Impacts: The applicant submitted a Technical Information Report, prepared by Sitts & Hill Engineers, Inc., dated July 2023 (Exhibit 11) with the application. The report analyzes existing conditions and proposed surface water collection and distribution. According to the TIR Report, the site is mainly covered in dirt and gravel and does not have an existing, private conveyance system. The project is proposing to add more than 5,000 square feet of new and replaced impervious area (approximately 9,418 sf of rooftop area and approximately 12,618 sf of pollution generating hard surface). As a result, the project would be subject to full drainage review and must satisfy all core requirements and special requirements of the 2022 City of Renton Stormwater Design Manual (RSWDM). The project proposes work within the Peak Rate Flow Control Standards (Existing Site Conditions) Area. The applicant is proposing a new on-site collection and conveyance system and associated enhanced water treatment device (a 4’ x 6’ BioPod Underground with StormMix Media) located near the northeast corner of the site. According to the TIR, the proposed conveyance system would convey stormwater to the City’s conveyance system which would ultimately discharge to the Black River via Springbrook Creek. Due to an increase of less than 0.15 cfs in the 100-year storm event, the project site would be exempt from flow control. It is anticipated that the requirements set forth by the 2022 RSWDM would be sufficient to mitigate stormwater impacts generated by the proposed development. The development would be subject to a surface water system development charge (SDC) fees. Mitigation Measures: No further mitigation is recommended. Nexus: Not applicable. 4. Environmental Health a. Environmental Health Hazards Impacts: The city received review comments from the Department of Ecology on September 27, 2023 (Exhibit 18) and staff responded to Ecology’s letter via email on September 27, 2023 (Exhibit 19). Ecology raised concerns that this proposed project is located in an area that may have been contaminated with heavy metals due to the air emissions originating from the old Asarco smelter in north Tacoma. Soil contamination form the former Asarco smelter poses a risk to human health and the environment. Construction workers, landscapers, gardeners, and others who work in the soils are at risk. Ecology is recommending a number of conditions prior to approval and issuance of any site development permits or prior to the initiation of grading, filling, or clearing. See Exhibit 18 for recommended conditions of approval. For example, if soils are found to be contaminated with lead or arsenic above the Model Toxics Control Act (MTCA) cleanup levels (Chapter 173-340 WAC), the owners, potential buyers, construction workers, and others would be required to be notified. In addition, if lead, arsenic and /or other contaminants are found at concentrations above MTCA cleanup levels the applicant would be required to complete the following: a) develop soil remediation plan and enter into the Voluntary Cleanup Program with Ecology; b) obtain an opinion letter from Ecology stating that the proposed soil remediation plan would likely result in no further action under MTCA and provide the local permitting agency the opinion letter from Ecology; and City of Renton Department of Community & Economic Development SW Grady Office and Shop Building Staff Report to the Environmental Review Committee LUA23-000300, ECF, SA-A, MOD Report of October 9, 2023 Page 7 of 11 SR_ERC_Report_231009_v1 c) prior to finalizing site development permits, provide to the local land use permitting agency “No Further Action” determination from Ecology indicating that the remediation plans were successfully implemented under MTCA. If the soils are found to be contaminated with contaminants, extra precautions should be taken by the applicant to avoid escaping dust, soil erosion, and water pollution during grading and site construction. According to the Environmental (SEPA) Checklist, the applicant is not aware of any contaminants on the site. Arsenic and lead in soil puts people at risk. According to Ecology’s Tacoma Smelter Plume map search tool (Dirt Alert (wa.gov)), the predicted arsenic concentration is 20 parts per million (ppm) to 40 ppm and the MTCA cleanup level for arsenic is 20 ppm. Therefore, staff recommends a mitigation measure that the applicant comply with the following recommendations found in the submitted letter from the Department of Ecology, dated September 27, 2023, prior to civil construction permit issuance: a. Sample the soil and analyze for arsenic and lead following the 2019 Tacoma Smelter Plume Guidance and send the soil sample results to Ecology for review. b. If lead or arsenic are found at concentrations above the Model Toxics Control Act (MTCA) cleanup levels (Chapter 173-340 WAC); the owners, potential buyers, construction workers, and others shall be notified of their occurrence. c. If lead, arsenic and/or other contaminants are found at concentrations above MTCA cleanup levels, the applicant shall: i. Develop soil remediation plan and enter into the Voluntary Cleanup Program with Ecology. ii. Obtain an opinion letter from Ecology stating that the proposed soil remediation plan will likely result in no further action under MTCA. The applicant shall provide to the local permitting agency the opinion letter from Ecology. iii. Prior to finalizing site development permits, provide to the local land use permitting agency “No Further Action” determination from Ecology indicating that the remediation plans were successfully implemented under MTCA. d. If soils are found to be contaminated with arsenic, lead, or other contaminants, extra precautions shall be taken to avoid escaping dust, soil erosion, and water pollution during grading and site construction. Contaminated soils generated during site construction shall be managed and disposed of in accordance with state and local regulations, including the Solid Waste Handling Standards regulation (Chapter 173-350 WAC). Mitigation Measures: The applicant shall comply with the following recommendations found in the submitted letter from the Department of Ecology, dated September 27, 2023, prior to civil construction permit issuance: a. Sample the soil and analyze for arsenic and lead following the 2019 Tacoma Smelter Plume Guidance and send the soil sample results to Ecology for review. b. If lead or arsenic are found at concentrations above the Model Toxics Control Act (MTCA) cleanup levels (Chapter 173-340 WAC); the owners, potential buyers, construction workers, and others shall be notified of their occurrence. c. If lead, arsenic and/or other contaminants are found at concentrations above MTCA cleanup levels, the applicant shall: i. Develop soil remediation plan and enter into the Voluntary Cleanup Program with Ecology. City of Renton Department of Community & Economic Development SW Grady Office and Shop Building Staff Report to the Environmental Review Committee LUA23-000300, ECF, SA-A, MOD Report of October 9, 2023 Page 8 of 11 SR_ERC_Report_231009_v1 ii. Obtain an opinion letter from Ecology stating that the proposed soil remediation plan will likely result in no further action under MTCA. The applicant shall provide to the local permitting agency the opinion letter from Ecology. iii. Prior to finalizing site development permits, provide to the local land use permitting agency “No Further Action” determination from Ecology indicating that the remediation plans were successfully implemented under MTCA. d. If soils are found to be contaminated with arsenic, lead, or other contaminants, extra precautions shall be taken to avoid escaping dust, soil erosion, and water pollution during grading and site construction. Contaminated soils generated during site construction shall be managed and disposed of in accordance with state and local regulations, including the Solid Waste Handling Standards regulation (Chapter 173-350 WAC). Nexus: State Environmental Policy Act (SEPA) Environmental Review; Model Toxics Control Act Cleanup Regulations (Chapter 173-340 WAC); and Solid Waste Handling Standards (Chapter 173- 350 WAC). a. Noise Impacts: Noise impacts would primarily result from construction activities associated with the project, primarily for the demolition of the existing building, engine noise for grading by conventional earthwork moving equipment, construction of the proposed infrastructure improvements, and future construction of the building (Exhibits 12 and 22). The construction noise would be regulated through the City’s adopted noise level regulations per Title 8 Chapter 7, RMC. The City’s construction standards limit haul hours between 8:30 am to 3:30 pm, Monday through Friday unless otherwise approved by the Development Services Division. The project site is not located within 300 feet of a residential area and construction is not anticipated to begin in until the spring of 2024. The City’s construction standards are anticipated to adequately mitigate the proposed construction impacts. Once the project is completed, noise would be limited to cars and tools inside the building during normal business hours and no significant long-term noise impacts are anticipated by the developer. Mitigation Measures: No further mitigation is recommended. Nexus: Not applicable. 5. Aesthetics Impacts: The existing site consists of a one-story building and parking for vehicle storage, such as recreational vehicles and boats (Exhibit 3). The boundary on all sides of the property is surrounded by chain link fence with the exception of the northern side of the site (Exhibit 4). The existing building is proposed to be demolished after construction of the new building. The applicant is proposing to construct a one-story office and shop building near the western portion of the site with new asphalt parking along the eastern portion of the site with parking for 17 vehicles (Exhibits 2, 6 and 7). Access to the property from SW Grady Way is proposed to shift or move from the west side of the lot to the east side of the lot as part of the proposed civil construction improvements. The relocated driveway access would be constructed to current city standards. The tallest height of the proposed structure is 22 feet and the principal exterior building material would include aluminum and metal siding. The project would be subject to Site Plan Review to ensure that proposed development is implemented in a manner consistent with the plans, policies and regulations of the City of Renton. Mitigation Measures: No further mitigation is recommended. Nexus: Not applicable. 6. Historic and Cultural Preservation City of Renton Department of Community & Economic Development SW Grady Office and Shop Building Staff Report to the Environmental Review Committee LUA23-000300, ECF, SA-A, MOD Report of October 9, 2023 Page 9 of 11 SR_ERC_Report_231009_v1 Impacts: The applicant is not expecting any impacts to cultural and historic resources on or near the project site. However, the applicant has not completed a Cultural Resources Assessment that would research land use of the project site, geographic setting and geologic conditions, ethnographic sources, research recorded cultural resources and prior surveys, and archaeological fieldwork. According to the Washington State Department of Archaeology and Historic Preservation (DAHP) online database (WISAARD) the project area is within a region that has been used by humans for at least 12,500 years and is within the traditional use areas of several federally recognized Tribes including the Snoqualmie Tribe of Indians, the Muckleshoot Indian Tribe, the Squaxin Island Tribe, the Suquamish Tribe, and the Tulalip Tribes. In addition, the project area is the traditional use territory of the Duwamish Tribe ancestors. The DAHP predictive model for precontact cultural materials classifies the project site as having a very high risk to contain archaeological resources likely due to the proximity to Springbrook Creek, Black River, and the Green River. As a best practice, the applicant should complete a monitoring plan that project plans and specifically outlines a process to be followed in the unlikely event that human remains are encountered at any time during implementation of the project. RCW 27.44.055 requires all activity to cease following discovery of suspected human remains and avoidance of anything that may cause further disturbance to those remains. The area of the find must be secured and protected from further disturbance. The CRA states that if human skeletal remains are found the discovery would be reported to the King County Medical Examiner and the Renton Police Department, the remains would not be touched, moved, or further disturbed, the Medical Examiner would assume jurisdiction over the human skeletal remains and determine whether those remains are forensic or non-forensic. If the Medical Examiner determined the remains are non-forensic, they would report that finding to the DAHP who would take jurisdiction over the remains. The DAHP would notify any appropriate cemeteries and all affected tribes of the find. The State Physical Anthropologist would determine whether the remains are Indian or Non- Indian, and report that finding to any appropriate cemeteries and the affected tribes. Finally, the DAHP would then handle all consultation with the affected parties as to the future preservation, excavation, and disposition of the remains. The city received review comments (via email) from the Duwamish Tribe on September 14, 2023 (Exhibit 16) and staff responded on September 20, 2023 (Exhibit 17). The Tribe recommended an archeological review be performed for this project due to the project location being within about a half mile of one of their ancestral village sites. This is in an area the Duwamish Tribe considers culturally significant and has a high probability to have unknown archeological deposits and that if any archeological work is performed that they receive notification. In addition, the Tribe notes that the soils reported in the PanGeo Geotechnical Report were alluvium with organic layers and shell fragments below fill. According to the Tribe’s comments, alluvium and organic layers are sediments that have potential for precontact cultural materials. Therefore, staff recommends as a mitigation measure that the project construction activities that would result in soil disturbance below the existing fill material be completed under observation by a professional archeologist. All project disturbance activities shall be included in a project-specific monitoring plan upon completion of the final project design. Consultation with concerned Tribes shall occur prior to survey activities. Mitigation Measures: Project construction activities that would result in soil disturbance below the existing fill material be completed under observation by a professional archeologist. All project disturbance activities shall be included in a project-specific monitoring plan upon completion of the final project design. Consultation with concerned Tribes shall occur prior to survey activities. 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. City of Renton Department of Community & Economic Development SW Grady Office and Shop Building Staff Report to the Environmental Review Committee LUA23-000300, ECF, SA-A, MOD Report of October 9, 2023 Page 10 of 11 SR_ERC_Report_231009_v1 7. Transportation Impacts: The applicant submitted a Traffic Letter, prepared by Jake Traffic Engineering, Inc., dated June 19, 2023 (Exhibit 15) with the application. Since the redevelopment project is anticipated to generate less than 20 AM (6:00 – 9:00 am) or PM peak-hour (3:00 – 6:00 pm) trips, a full Traffic Impact Analysis was not required to be submitted with the land use application. The Traffic Letter indicates that the project is projected to generate about 16 to 17 net new PM peak hour trips to the city’s street grid. The project would be subject to transportation impact fees. The transportation impact fee that is current at the time of building permit issuance would be levied. The proposal has passed the City’s Traffic Concurrency Test per RMC 4-6-070.D (Exhibit 26), which is based upon a test of the citywide Transportation Plan, consideration of growth levels included in the LOS-tested Transportation Plan, site specific improvements, and payment of a Transportation Mitigation Fee. Mitigation Measures: No further mitigation is recommended. Nexus: Not applicable. 8. Fire & Police Impacts: Police and Fire Prevention staff indicated that sufficient resources exist to furnish services to the proposed development; subject to the condition that the applicant provides Code required improvements and fees (Exhibit 27). Mitigation Measures: No further mitigation is recommended. Nexus: Not applicable. 9. Utilities Impacts: The city received review comments from the King County Wastewater Treatment Division (WTD) on September 27, 2023 (Exhibit 20) and staff responded to WTD’s letter on September 28, 2023 (Exhibit 21). King County facilities and property are located adjacent to the proposed project property. WTD has noted that the applicant’s fence, located on the north end of the site, is currently encroaching on King County property and would need to be removed along with any other personal property. WTD is requesting that the city provide project construction drawings to WTD, such that WTD would have the ability to further assess potential project impacts and be able to provide protection and restoration comments. Any access to WTD property for survey, design information, removal of encroachments, along with construction and operation of the sewer connection would need to be granted by WTD. All property information would be required to be submitted to WTD Permitting Compliance and Property Acquisition. Per the advisory notes (Exhibit 27), the applicant would be required to provide documentation from King County indicating they approve of shared use of the 8-inch sewer main within King County wastewater vacant land (Exhibit 13). Furthermore, the project would be subject to a Civil Construction Permit to ensure that proposed development is completed in accordance with current manuals, standards, details, and regulations of the City of Renton. Construction work would not be allowed to commence until a civil construction permit has been approved, is issued, and the pre-construction meeting has been held; therefore, no additional mitigation is recommended at this time. Mitigation Measures: No further mitigation is recommended. Nexus: Not applicable. City of Renton Department of Community & Economic Development SW Grady Office and Shop Building Staff Report to the Environmental Review Committee LUA23-000300, ECF, SA-A, MOD Report of October 9, 2023 Page 11 of 11 SR_ERC_Report_231009_v1 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.”  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 October 23, 2023. 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. CITY OF RENTON DEPARTMENT OF COMMUNITY AND ECONOMIC DEVELOPMENT STAFF REPORT TO THE ENVIRONMENTAL REVIEW COMMITTEE EXHIBITS Project Name: SW Grady Office and Shop Building Land Use File Number: LUA23-000300, ECF, SA-A, MOD Date of Meeting October 9, 2023 Staff Contact Clark H. Close Principal Planner Project Contact/Applicant David Boileau Sitts & Hill Engineers, Inc. 4815 Center St, Tacoma, WA 98409 Project Location 1404 SW Grady Way, Renton, WA 98055 (APN 2423049061) The following exhibits are included with the ERC Report: Exhibit 1: Environmental Review Committee (ERC) Report Exhibit 2: Preliminary Site Plans (Interim and Final Phases) Exhibit 3: Neighborhood Detail Map Exhibit 4: Topographic Survey Exhibit 5: Overall Architectural Floor Plans Exhibit 6: Architectural Exterior Elevations Exhibit 7: Architectural Renderings Exhibit 8: Landscape Plans Exhibit 9: Arborist Report Exhibit 10: Tree Retention Plans Removal Plan Exhibit 11: Technical Information Report, prepared by Sitts & Hill Engineers, Inc., dated July 2023 Exhibit 12: Conceptual Grading and Drainage Plans (Interim and Final Phases), prepared by Sitts & Hill Engineers, Inc., dated February 1, 2023 Exhibit 13: Conceptual Utility Plan, prepared by Sitts & Hill Engineers, Inc., dated February 1, 2023 Exhibit 14: Geotechnical Report, prepared by PanGEO Inc., dated July 2023 Exhibit 15: Traffic Letter, prepared by Jake Traffic Engineering, Inc., dated June 19, 2023 Exhibit 16: Comment Email from the Duwamish Tribe, dated September 14, 2023 Exhibit 17: Staff Response to Duwamish Tribe, dated September 20, 2023 Exhibit 18: Comment Letter from Department of Ecology, dated September 27, 2023 Exhibit 19: Staff Response to Department of Ecology, dated September 27, 2023 Exhibit 20: Comment Letter from King County Department of Natural Resources and Parks – Wastewater Treatment Division (KCWTD), dated September 27, 2023 Exhibit 21: Staff Response to KCWTD, dated September 28, 2023 Exhibit 22: Environmental (SEPA) Checklist, dated August 21, 2023 Exhibit 23: Construction Mitigation Description Exhibit 24: Letter of Understanding of Geologic Risk City of Renton Department of Community & Economic Development SW Grady Office and Shop Building Staff Report to the Environmental Review Committee LUA23-000300, ECF, SA-A, MOD Report of October 9, 2023 Page 13 of 2 SR_ERC_Report_231009_v1 Exhibit 25: Hazardous Materials Statement Exhibit 26: Transportation Concurrency Memo Exhibit 27: Advisory Notes