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HomeMy WebLinkAboutSR_ERC_Cedar_River_AptsDEPARTMENT OF COMMUNITY AND ECONOMIC DEVELOPMENT Project Location Map SR_ERC_Cedar_River_Apts ENVIRONMENTAL REVIEW COMMITTEE REPORT ERC Meeting Date: June 14, 2021 Project File Number: PR19-000306 Project Name: Cedar River Apartments Land Use File Number: LUA19-000161, ECF, SA-M, SSDP Project Manager: Matt Herrera, Current Planning Manager Owner: Andy Loos, SRMRenton LLC, 720 6th Street S., Suite 100, Kirkland, WA 98033 Applicant/Contact: David Maul, Rutledge Maul Architects, 19940 Ballinger Way NE, Suite A-3, Shoreline, WA 98155 Project Location: 1915 Maple Valley HWY, Renton, WA 98057 Project Summary: The applicant is requesting Environmental Review, Master Site Plan Review, Site Plan Review for Phases 1 and 2, and a Shoreline Substantial Development Permit for a phased mixed-use development that would include 481 multifamily dwelling units, 4,852 square feet of commercial space, and a 25,000 square feet of medical office building located at 1915 Maple Valley Highway. The southern boundary of the subject property abuts the Cedar River. Vehicle access would be provided via Cedar River Park Drive and from Maple Valley Highway. The site would accommodate 761 vehicle parking spaces. The applicant proposes to fill a portion of the river floodplain within a southern section of the proposed building footprint and provide compensatory flood storage southwest of the fill site. Associated site improvements related to drainage, street frontage improvements along Maple Valley Highway and Cedar River Park Drive, restoration and public access along the Cedar River shoreline, and general landscaping are also proposed. Exist. Bldg. Area SF: N/A Proposed New Bldg. Area (footprint): Proposed New Bldg. Area (gross): 174,189 sq.ft. 719,550 sq. ft. Site Area: 546,121 sq. ft. STAFF RECOMMENDATION: Staff Recommends that the Environmental Review Committee issue a Determination of Non-Significance- Mitigated (DNS-M). Site DocuSign Envelope ID: 99BA427F-FE67-49CC-B142-9BE0760232C1 City of Renton Department of Community & Economic Development Cedar River Apartments Staff Report to the Environmental Review Committee LUA19-000161, ECF, SA-M, SSDP Report of June 14, 2021 Page 2 of 16 SR_ERC_Cedar_River_Apts PART ONE: PROJECT DESCRIPTION / BACKGROUND The subject property is located at 1915 Maple Valley Highway abutting the Cedar River (Exhibit 2). The site is 546,121 square feet (12.54 acres) and currently vacant. The previous use of the site was a cement sand and gravel facility. The comprehensive plan and zoning designation of the site is Commercial Office Residential (COR) and it is located in the Cedar River Community Planning Area. Overlay zones affecting the subject property include Urban Design District ‘C’, Airport Influence Area – Traffic Pattern Zone, Shoreline High-Intensity and Cedar River Reach ‘C’. The applicant is requesting Environmental Review, Master Site Plan Review, Site Plan Review for Phases 1 and 2, and a Shoreline Substantial Development Permit for a phased mixed-use development that would include 481 multifamily dwelling units, 4,852 square feet of commercial space, and 25,000 square feet of medical office space (Exhibit 3 and 4). The applicant proposes a three (3) phase project (Exhibit 5) with construction of Building ‘A’, surface parking and vehicle circulation, shoreline restoration, and street frontage improvements in the initial phase, construction of Building ‘B’ in the second phase, and construction of the medical office building in the final phase. The proposed Buildings A and B would be five (5) stories in height (Exhibits 6 and 7) and setback a minimum of 100- feet from the Ordinary High Water Mark (OHWM) of the Cedar River. Ground floor commercial space would be located along the north elevation of Building B. Within the middle of Buildings A and B, amenity and property office space would be provided within a two-story step-down component of the structure. The remaining portions of the exterior structure would be wrapped with dwelling units with the exception of areas needed for necessary utility/mechanical/refuse rooms and bicycle storage along the ground floor (Exhibit 8). The proposed office building (Exhibit 9) would contain a single-floor of medical office space with higher ceilings and the appearance of second story glazing, however the building would contain only ground floor medical office tenant space with sub-grade parking (Exhibit 10). Vehicle access to the site would be from Cedar River Park Drive and right-in/right-out access located 350-feet south of the signalized Cedar River Park Drive/Maple Valley Highway intersection (Exhibit 11). The fully developed site would contain 761 vehicle parking spaces. Buildings A and B would provide 645 structured parking spaces and the medical office building would provide 60 below grade structured parking spaces. A surface parking lot would provide an additional 56 spaces. New planter strips with street trees, sidewalks, curb, gutter, and lighting would be provided along the site’s Cedar River Park Drive and Maple Valley Highway frontages. The site‘s southern boundary abuts the Cedar River. The City’s mapping system has identified a Flood Hazard and Wellhead Protection Zone 1 on the site. King County has identified a Channel Migration Zone on the site. An existing bulkhead is located along the southern boundary except for the far western portion of the property. The applicant has proposed to fill a portion of the flood storage area (Exhibits 12 and 13) to accommodate a southern portion of the building. To compensate for the loss of existing flood storage, the applicant proposes to grade additional areas southwest of the building to provide additional flood storage. The applicant’s proposal would maintain a minimum 100-foot setback for Buildings A and B from the OHWM. Within the setback area, the applicant has proposed shoreline habitat restoration and pedestrian access amenities (Exhibits 14-18). PART TWO: 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 DocuSign Envelope ID: 99BA427F-FE67-49CC-B142-9BE0760232C1 City of Renton Department of Community & Economic Development Cedar River Apartments Staff Report to the Environmental Review Committee LUA19-000161, ECF, SA-M, SSDP Report of June 14, 2021 Page 3 of 16 SR_ERC_Cedar_River_Apts B. Mitigation Measures 1. The project shall comply with the recommendations of the geotechnical report, prepared by Terracon Consultants Inc., dated October 31, 2018 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’s geotechnical engineer shall provide notes on the construction and building permit plans identifying when onsite geotechnical engineer supervision of construction events is recommended. 4. The applicant shall submit a Final Technical Information Report (TIR) with the civil construction permit application that includes qualitative and quantitative analysis demonstrating compliance with the Water Resource Inventory Area (WRIA) 8 Chinook Salmon Conservation Plan. The analysis shall provide justification for the currently proposed stormwater improvements, or if needed, an amended proposal to comply with the conservation plan as it relates to salmon health, habitat, and effects from the project’s stormwater discharge into the Cedar River. The analysis and any amendments to the proposed stormwater improvements needed to comply with the conservation plan shall be reviewed and approved by the Development Engineering Plan Reviewer prior to permit issuance. 5. The applicant shall submit an archeological survey prepared by a qualified professional with the civil construction permit application. Consultation with Concerned Tribes shall occur prior to survey activities. Based on the results and recommendations of the survey, an Inadvertent Discoveries Plan and onsite monitoring during construction activities by a professional archeologist funded by the applicant may be required. 6. The applicant shall reconfigure the northbound Cedar River Park Drive to provide dual left turn lanes with a shared right turn lane (curb lane). To support this new channelization, the applicant shall install signal detection, signal head modifications, and overhead signage on the east side mast-arm at the intersection of Cedar River Park Drive and Maple Valley Highway. The applicant shall submit plans to construct these off-site improvements with the civil construction permit application to be reviewed and approved by Development Engineering and Transportation staff prior to permit issuance. 7. The applicant shall fully fund the installation and configuration of the Adaptive Traffic Control System (ATCS) Split Cycle Offset Optimization Technique (SCOOT) along intersections impacted by the proposal including NE 3rd Street/Monterey Drive NE and those identified in the Cedar River Apartments Independent Transportation and Mitigation Analysis (Exhibit 34) prepared by Transpo Group dated May 7, 2021. Installation, configuration, and operation of the SCOOT system shall occur prior to Temporary Certificate of Occupancy of the first building. 8. The applicant shall identify and propose potential traffic calming measures to be located within the Cedar River Park parking lot to discourage project related cut-through traffic. The traffic calming proposal shall be coordinated and approved by the Community Services Department. Approved traffic calming measures shall be installed prior to Temporary Certificate of Occupancy of the first building. C. Exhibits Exhibit 1: Environmental Review Committee (ERC) Report Exhibit 2: Boundary and Topographic Survey Exhibit 3: Site Plan Exhibit 4: Landscaping Plan Exhibit 5: Phasing Plan DocuSign Envelope ID: 99BA427F-FE67-49CC-B142-9BE0760232C1 City of Renton Department of Community & Economic Development Cedar River Apartments Staff Report to the Environmental Review Committee LUA19-000161, ECF, SA-M, SSDP Report of June 14, 2021 Page 4 of 16 SR_ERC_Cedar_River_Apts Exhibit 6: Elevations and Renderings Building A Exhibit 7: Elevations and Renderings Building B Exhibit 8: Floor Plans Buildings A and B Exhibit 9: Elevations and Renderings Medical Office Exhibit 10: Floor Plans Medical Office Exhibit 11: Civil Sheets (Grading, Storm Drainage, and Utility) Exhibit 12: Flood Boundary Map Exhibit 13: Compensatory Storage Plan Exhibit 14: Shoreline Site Plan and Sections Exhibit 15: Shoreline Landscaping Plan Exhibit 16: Shoreline Grading and Trail Plan Exhibit 17: Tree Retention Plan Exhibit 18: Arborist Report, prepared by the Watershed Company dated October 2018 Exhibit 19: Geotechnical Report prepared by Terracon Consultants, dated October 31, 2018 Exhibit 20: Bulkhead Wall Stability Addendum prepared by Terracon Consultants, dated June 10, 2019 Exhibit 21: Bulkhead Wall Stability Addendum No. 2 prepared by Terracon Consultants, dated May 21, 2020 Exhibit 22: Bulkhead Wall Stability Addendum No. 3 prepared by Terracon Consultants, dated July 24, 2020 Exhibit 23: Scour Analysis prepared by The Watershed Company, dated March 30, 2020 ( Revised July 10, 2020) Exhibit 24: Secondary Geotechnical Review Memoranda prepared by GeoEngineers, Inc., dated October 28, 2019, July 8, 2020, and October 12, 2020 Exhibit 25: Channel Migration Risk Assessment Memorandum prepared by The Watershed Company, dated April 8, 2020 Exhibit 26: Conditional Letter of Map Revision Based on Fill (CLOMR-F) Form Exhibit 27: Critical Areas Report prepared by The Watershed Company, dated October 2018 Exhibit 28: Department of Ecology (DOE) No Further Action Letter, dated October 31, 2019 and Environmental Covenant recorded on July 16, 2020 Exhibit 29: Drainage Report (Technical Information Report), prepared by KPFF Consulting Engineers, dated January 11, 2019 Exhibit 30: Muckleshoot Indian Tribe Comments dated August 29, 2019 Exhibit 31: Traffic Impact Analysis (TIA) prepared by William Popp Associates, dated July 6, 2020 Exhibit 32: Secondary Transportation Review Memoranda prepared by Transpo Group, dated December 2, 2019 and April 29, 2020 Exhibit 33: Washington State Department of Transportation (WSDOT) Comments dated September 9, 2019 DocuSign Envelope ID: 99BA427F-FE67-49CC-B142-9BE0760232C1 City of Renton Department of Community & Economic Development Cedar River Apartments Staff Report to the Environmental Review Committee LUA19-000161, ECF, SA-M, SSDP Report of June 14, 2021 Page 5 of 16 SR_ERC_Cedar_River_Apts Exhibit 34: Cedar River Apartment Independent Transportation and Mitigation Analysis prepared by Transpo Group, dated May 7, 2021 Exhibit 35: Applicant Response to Transpo Group Analysis, dated June 7, 2021 Exhibit 36: Transportation Concurrency Test Memorandum, prepared by City of Renton Development Engineering Manager, dated November 6, 2020 Exhibit 37: Duwamish Tribe Comments dated April 1, 2021 Exhibit 38: Construction Mitigation Description Exhibit 39: 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: 1. Earth Impacts: As provided in the applicant’s geotechnical report prepared by Terracon Consultants, Inc, (Terracon) dated October 31, 2018 (Exhibit 19) the surficial geology of site is shown as Qac – Quaternary, Cedar River alluvium per the Washington State Department of Natural Resources and the observed onsite soils were consistent with the geologic mapped units and were predominantly alluvial deposits overlain by fill. Subsurface conditions include a relatively shallow unit of loose to very dense existing fill, loose to medium dense sand of variable silt and gravel content, and medium dense to very dense sand and gravel alluvium. The initial stratum fill layer contained anthropogenic debris including concrete, brick, wood, plastics, metal, and fabric. The western portion of the subject property contains concrete-like soils that were likely hardened through the leaching of wet cement from the site’s previous use. A total of seven (7) soil borings and 12 test pits were completed by the geotechnical engineer. The site’s previous industrial use resulted in soil contamination. Soil contaminants of concern that were identified were gasoline-, diesel-, and oil-range petroleum hydrocarbons (TPH-G, TPH-D, and TPH-O), and formaldehyde. The applicant participated in the Washington State Department of Ecology (DOE) Voluntary Cleanup Program and removed approximately 23,600 cubic yards of high pH, oil contaminated, formaldehyde, and petroleum contaminated soils. Additionally, the applicant removed a 600-gallon heating oil underground storage tank. On October 31, 2019 the applicant received a No Further Action opinion letter from DOE (Exhibit 28). The letter states, in part, that no further remedial action is necessary to clean up contamination at the site and the opinion is dependent on the continued performance and effectiveness of the post-cleanup controls and monitoring that are required by the agency. See Groundwater section 3.b for controls, monitoring, and environmental covenant. Restrictions, limitations, and monitoring standards of the environmental covenant are anticipated to mitigate soil contamination impacts. City of Renton (COR) mapping indicates the site may contain sensitive and protected slopes. The geotechnical report states slope areas along the Cedar River are generally present due to natural stream processes as the river has eroded and steepened the upland soils. Isolated sensitive slopes upland of the river would be leveled during site grading to support the proposed development. A protected slope along the southeastern portion of the property would not be impacted as most of the area is within the 100-foot OHWM buffer area. No proposed structure encroachments are proposed within the protected slope or its 15-foot setback. DocuSign Envelope ID: 99BA427F-FE67-49CC-B142-9BE0760232C1 City of Renton Department of Community & Economic Development Cedar River Apartments Staff Report to the Environmental Review Committee LUA19-000161, ECF, SA-M, SSDP Report of June 14, 2021 Page 6 of 16 SR_ERC_Cedar_River_Apts COR mapping also indicates the site is within a High Seismic Hazard Area. The geotechnical report states that based on the site’s geology and subsurface groundwater conditions, the hazard of liquefaction of the site’s soils is moderate to high for the subject property during a design level earthquake and is most likely to trigger between 18 and 32 feet below the ground surface. Liquefaction-induced settlements are estimated to range from 2 to 6 inches. Horizontal movements from lateral spreading are estimated to range from ½ to 3 feet. Due to the above-referenced potential for seismic induced vertical and lateral movements and cost effectiveness of deep foundations to mitigate movements, the geotechnical engineer has recommended the use of mat foundations over aggregate piers. As the geotechnical report has confirmed the seismic hazard indicated on the City’s Critical Areas Map and the potential for liquefaction was deemed moderate to high based on geotechnical modeling conducted by the applicant’s consultant, staff recommends mitigation measures related to following the recommendations of the geotechnical report, review of the construction and building permit plans by the geotechnical engineer to ensure compliance with intent and recommendations of the report, and onsite supervision by the geotechnical engineer during identified stages of construction. The applicant anticipates approximately 2,673 cubic yards of excavation and approximately 42,417 cubic yards of fill to support the construction of the proposed development. As the site is located within the Downtown Wellhead Protection Area Zone 1, a Fill Material Source Statement prepared by a professional engineer or licensed geologist would be required prior to stockpiling or grading any imported fill on the subject property pursuant to RMC 4-4-060N.4.e. Alternatively, the applicant could obtain fill from a WSDOT approved source and thereby avoid the need for a source statement (RMC 4-4- 060N.4.i). Mitigation Measures: a. The project shall comply with the recommendations of the geotechnical report, prepared by Terracon Consultants Inc., dated October 31, 2018 and any future addenda. b. 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). c. The applicant’s geotechnical engineer shall provide notes on the construction and building permit plans identifying when onsite geotechnical engineer supervision of construction events is recommended. Nexus: 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 through the use of temporary erosion control measures, watering or other measures to remediate impacts as needed (Exhibit 38). Mitigation Measures: None recommended. Nexus: Not applicable. 3. Water a. Wetland, Streams, Lakes DocuSign Envelope ID: 99BA427F-FE67-49CC-B142-9BE0760232C1 City of Renton Department of Community & Economic Development Cedar River Apartments Staff Report to the Environmental Review Committee LUA19-000161, ECF, SA-M, SSDP Report of June 14, 2021 Page 7 of 16 SR_ERC_Cedar_River_Apts Impacts: The subject property borders the Cedar River along its southern property line and 200-feet landward of the OHWM and floodway is designated a shoreline jurisdiction under the State’s Shoreline Management Act and City of Renton Shoreline Master Program (SMP). The SMP environmental designation assigned to the subject property is Shoreline High Intensity and it is located in the Cedar River Reach C (CR-C). Additional portions of the property are mapped within the Floodway, Special Flood Hazard Area – FEMA Zone AE, and the King County Department of Natural Resources has mapped the property with a Channel Migration Zone – Severe Hazard Area. The scope of the project requires a Shoreline Substantial Development Permit, which the applicant has requested as a component of the land use application. The shoreline is armored from the far eastern boundary of the site forming the OHWM to the west central portion of the shoreline where a constructed settling pond that functioned during the previous concrete facility use. West of the settling pond, the shoreline armoring extends approximately 170-feet and then the bank slopes gradually for the remaining shoreline area between the armoring and the abutting Renton Community Center property. The applicant has proposed to retain the existing shoreline armoring and incorporate a minimum building setback of no less 100-feet from the OHWM as shown on the Site Plan (Exhibit 3). The applicant has submitted geotechnical analysis specific to bulkhead stability (Exhibits 20-22) and scour study (Exhibit 23) based on comments from the City’s secondary reviewer GeoEngineers (Exhibit 24). As provided in the Bulkhead Wall Stability Addendum and two revisions of the addendum prepared by Terracon, dated June 10, 2019, May 21, 2020, and July 24, 2020, respectively (Exhibits 20-22), the shoreline armoring along the subject property consists of a concrete bulkhead ranging in height from 9 to 18 feet from the settling pond to the eastern extent of the subject property. The survey (Exhibit 2) indicates the bulkhead west of the settling pond ranges from approximately 4 to 10 feet. The toe of the wall consists of mass concrete along the base with concrete blocks stacked vertically and embedded into the mass. Reconnaissance by Terracon found no evidence of wall distress and the stability addendum suggests the bulkhead has not moved since its initial construction that occurred approximately 1961-1962 per the scour analysis (Exhibit 23). The applicant provided a scour analysis, prepared by The Watershed Company dated July 10, 2020, (Exhibit 23) to identify any potential for scour to occur at the base of the bulkhead and undermine the shoreline armoring along the subject property. The analysis identified a scour pool at the easternmost section of the property’s shoreline with no other areas along the subject property appearing to have adverse scour potential. The scour pool depth was estimated at 8.5 feet. The analysis modeled the potential for further scouring in this pool that would result from 50-year and 100-year floods based on Army Corps of Engineers data and found a 100-year scour depth increase of 0.55 feet. River geometry and reconnaissance by The Watershed Company indicates the 100-year scour depth would likely be shallower at other sections along the subject property. Per comments from the City’s secondary geotechnical reviewer GeoEngineers (Exhibit 24), the applicant provided a final revision to the Bulkhead Wall Stability Addendum prepared by Terracon dated July 24, 2020 (Exhibit 22) that evaluated the stability using a scour depth of 9.1 feet based on the above referenced scour depth of 8.5 feet and 100-year flood increase of 0.55-feet and to consider potential cracks within the existing bulkhead. The factor of safety analysis found the existing bulkhead does not appear to be at risk of failure from scour and for seismic events there is a potential for some movement of the bulkhead wall near the settling pond in one of the models. The analysis concluded that potential wall movements from a seismic event could be addressed via maintenance. The City’s secondary geotechnical reviewer’s final review letter dated October 12, 2020 (Exhibit 24), concludes the level of stability is not appropriate for areas that would directly impact inhabited structures, which is not proposed, but it is appropriate for the proposed riparian buffer and appropriate for the proposed building setbacks from the OHWM. DocuSign Envelope ID: 99BA427F-FE67-49CC-B142-9BE0760232C1 City of Renton Department of Community & Economic Development Cedar River Apartments Staff Report to the Environmental Review Committee LUA19-000161, ECF, SA-M, SSDP Report of June 14, 2021 Page 8 of 16 SR_ERC_Cedar_River_Apts The Watershed Company also provided a Channel Migration Risk Assessment dated April 8, 2020 (Exhibit 25). The analysis found that the Cedar River upstream from I-405 for approximately two (2) miles contains an incised reach with narrow, irregular meanders, and hardened banks. Most outside bends contain levees and revetments. Additionally, the subject property contains concrete bulkhead along most of the OHWM. Historical imagery of the subject property shows no side channel development, channel avulsion or significant bank erosion that is indicative of channel migration. The memo states that there are no geomorphic or photogrammatic indicators of a historical migration area since the construction of the Seattle City Light Masonry Dam and that based on the analysis there is no evidence to support a channel migration hazard on the subject property. The memo concludes that the channel migration zone mapped by King County is based on unarmored areas of the Cedar River and thereby would not apply to the subject property. As shown on the Flood Boundary Map and Compensatory Storage Plan (Exhibits 12 and 13), the applicant proposes to fill portions of the subject property’s floodplain to accommodate the location of the proposed building and infrastructure. The applicant has also submitted a Conditional Letter of Map Revision Based on Fill (CLOMR-F) form (Exhibit 26) that, if approved by the Federal Emergency Management Agency, would result in the building’s exclusion from the flood hazard area as indicated on the Flood Insurance Rate Map (FIRM) map. The Compensatory Storage Plan (Exhibit 13) proposes approximately 883 cubic yards of fill to be placed within the existing floodplain. The applicant proposes to excavate approximately 1,374 cubic yards to provide compensatory flood storage. Additionally, the river side wall of the settling pond is proposed to be reduced thereby providing approximately 2,126 cubic yards of flood storage. The net increase in flood storage with the floodplain excavation and settling pond storage results in 2,616 cubic yards. It is anticipated the Critical Areas Regulations will adequately mitigate impacts to the Cedar River floodplain. The Critical Areas Report, prepared by The Watershed Company dated October 2018 (Exhibit 27), states vegetation is limited to few areas with much of the property consisting of compacted gravel. As a component of Phase I of the Master Plan (Exhibit 5), the applicant proposes restoration of the riparian buffer as identified in the Shoreline Landscaping Plan (Exhibit 15). Proposed vegetation would include native species suitable for high visibility, view preservation, and forested conditions. Bioswale and meadow planting would be located in stormwater and areas in and around the settling ponds, respectively. The applicant would also regrade the riparian area and construct passive trails and as shown on the Shoreline Grading and Trail Plan (Exhibit 16). The riparian restoration and trail plan will be reviewed for compliance with the Shoreline Master Plan Regulations as a component of Shoreline Substantial Development Permit. Mitigation Measures: None recommended. Nexus: N/A b. Ground Water Impacts: The subject property is located in the Downtown Wellhead Protection Area Zone 1. The site’s previous industrial use resulted in groundwater contamination. Groundwater contaminants of concern that were identified were formaldehyde, arsenic, and highly alkaline pH. The applicant participated in the Washington State Department of Ecology (DOE) Voluntary Cleanup Program and removed approximately 23,600 cubic yards of high pH, oil contaminated, formaldehyde, and petroleum contaminated soils and 3,000 gallons of groundwater. On October 31, 2019, the applicant received a No Further Action opinion letter from DOE. The letter states, in part, that no further remedial action is necessary to clean up contamination at the site and the opinion is dependent on the continued performance and effectiveness of the post-cleanup controls and monitoring that are required by the agency (Exhibit 28). DocuSign Envelope ID: 99BA427F-FE67-49CC-B142-9BE0760232C1 City of Renton Department of Community & Economic Development Cedar River Apartments Staff Report to the Environmental Review Committee LUA19-000161, ECF, SA-M, SSDP Report of June 14, 2021 Page 9 of 16 SR_ERC_Cedar_River_Apts The following post-cleanup controls have been deemed necessary by DOE: (1) Existing or future buildings shall not be constructed or altered in any manner that would expose contaminated soil or ground water, result in a release of contaminants, or create a new exposure pathway, without prior written approval of DOE; (2) No groundwater extraction with the exception of investigation, monitoring, or remediation performed in accordance with requirements imposed by DOE for the site; and restrictions on future stormwater facility infiltration. Additionally, the site will be required to undergo groundwater monitoring for a minimum of five (5) years beginning October 2019. The applicant has entered into an environmental covenant with DOE that was recorded July 16, 2019 (Exhibit 28). The covenant specifies post cleanup control and monitoring requirements. The covenant also requires the applicant to submit groundwater monitoring reports to the City’s Water Utility. Restrictions, limitations, and monitoring standards of the environmental covenant are anticipated to mitigate groundwater impacts. Mitigation Measures: None recommended. Nexus: Not applicable. c. Storm Water Impacts: The applicant’s preliminary Technical Information Report (TIR) prepared by KPFF Consulting Engineers, dated January 11, 2019 (Exhibit 29) indicates drainage from the site discharges to the Cedar River which then flows northwest to Lake Washington. Existing stormwater conveyance near the site is limited to infrastructure in the Maple Valley Highway and Cedar River Park Drive right-of-way, with no existing onsite stormwater improvements. The proposal requires full drainage review under the 2017 Renton Surface Water Design Manual (RSWDM). Based on the City of Renton’s flow control map, the site falls under Flow Control Duration Standards (Forested Conditions) and is located within the Lower Cedar River drainage basin. The subject property is located within a Wellhead Protection Zone 1, which precludes the use of Best Management Practices (BMPs) that rely on stormwater infiltration, open stormwater facilities, and connections to subsurface drains. The subject property is located within an Enhanced Basic Water Quality treatment area per the RSWDM. The applicant proposes to discharge the stormwater from the project via direct discharge into the Cedar River. Targeted pollution generating impervious surfaces would be treated via three (3) Filterra system units. Two of the water quality units would be located northwest of the traffic roundabout and the third would be located between Building B and Maple Valley Highway near the right-in right-out ingress/egress. Flows from the water quality units and non-pollution generating surfaces are proposed to be piped with two (2) outfalls on the Cedar River, one (1) outfall located in the former location of the washout basin and one (1) outfall approximately 385-feet to the west. The Muckleshoot Indian Tribe submitted comments (Exhibit 30) concerning several aspects of the project including the direct discharge proposal into the Cedar River and its effect on the health and survival of juvenile salmon. Special Requirement #1 of the 2017 RSWDM requires that projects located where a salmon conservation plan has been adopted comply with the drainage requirement of the specific adopted plan. The Water Resource Inventory Area (WRIA) 8 Chinook Salmon Conservation Plan was adopted by Resolution No. 3761 and provides a comprehensive action list for the Cedar River. The applicant’s preliminary TIR (Exhibit 29) does not address compliance with the WRIA 8 Chinook Salmon Conservation Plan and does not address the Tribe’s concerns with increased water velocities. Therefore, staff recommends as a mitigation measure the applicant demonstrate compliance with the WRIA 8 Chinook Salmon Conservation Plan prior civil construction permit issuance. A final TIR addressing items in the Advisory Notes (Exhibit 39) will be required to be prepared and submitted with the civil construction permit. During site construction, the applicant would be DocuSign Envelope ID: 99BA427F-FE67-49CC-B142-9BE0760232C1 City of Renton Department of Community & Economic Development Cedar River Apartments Staff Report to the Environmental Review Committee LUA19-000161, ECF, SA-M, SSDP Report of June 14, 2021 Page 10 of 16 SR_ERC_Cedar_River_Apts required to implement temporary erosion and sediment control measures. Such measures would include but are not limited to silt fences, conveyance swales, check dams, a sediment pond with a liner, catch basin inserts, mulching of exposed areas, and dust control. Mitigation Measure: The applicant shall submit a Final Technical Information Report (TIR) with the civil construction permit application that includes qualitative and quantitative analysis demonstrating compliance with the Water Resource Inventory Area (WRIA) 8 Chinook Salmon Conservation Plan. The analysis shall provide justification for the currently proposed stormwater improvements, or if needed, an amended proposal to comply with the conservation plan as it relates to salmon health, habitat, and effects from the project’s stormwater discharge into the Cedar River. The analysis and any amendments to the proposed stormwater improvements needed to comply with the conservation plan shall be reviewed and approved by the Development Engineering Plan Reviewer prior to permit issuance. Nexus: City of Renton Resolution No. 3761; WRIA 8 Chinook Salmon Conservation Plan; and 2017 RSWDM 4. Vegetation Impacts: Nearly all the subject property consists of impervious surfaces void of any vegetation with the exception of areas along the shoreline. Per the City’s tree retention standards, the site contains no existing significant trees as the 53 total trees are located within critical areas or their buffers. All 53 trees are deciduous and are made up of Black Cottonwood, Red Alder, Bigleaf Maple, and one (1) unknown species. The largest tree on-site is a two-stem 48-inch-diameter Black Cottonwood. Four (4) other deciduous trees, all black cottonwood, measure over thirty caliper inches. These five (5) trees represent the only landmark trees on the parcel. The largest stands of trees are located in the southwest and southeast corners of the subject property. These areas will remain largely intact with removal limited to reduce hazards or provide public access to the shoreline (Exhibits 17 and 18). The applicant proposes to retain 34 trees along the shoreline. The 19 trees proposed for removal are either located in the future boardwalk alignment (8 trees), have risk of failure (1 tree), are growing out of an existing wall that is to be retained (5 trees), would be adversely impacted due to grading (4 trees), or would block public access to future pedestrian path (1 tree). Of the 19 trees to be removed, one (1) tree is in good condition with the remainder fair, poor, or dead/dying. Two (2) large Black Cottonwoods on the southwest portion of the site slated for removal would be made into snags for habitat. The applicant has proposed a Shoreline Landscaping Plan (Exhibit 15) within the 100-foot vegetation conservation buffer that would provide native planting with areas designated for high visibility, view preservation, forest, bioswale, and meadow. Landward of the 100-foot vegetation conservation buffer, the applicant has proposed a variety of trees, shrubs, and groundcovers along the property’s perimeter, parking lot, planter strips, and exterior amenity areas (Exhibit 4). Mitigation Measures: None recommended. Nexus: Not applicable. 5. Wildlife Impacts: Habitat on the subject property is limited due the previous industrial use. The Critical Areas Report (Exhibit 27) indicates the abutting Cedar River is known or modeled to contain Salmonids that include project area. Salmonid species known or modeled to occur in the Cedar River include cutthroat trout, bull trout, steelhead, kokanee, sockeye salmon, Chinook salmon, and coho salmon. The applicant proposes to construct buildings and infrastructure landward of the 100-foot vegetation conservation buffer along the river’s shoreline and proposed shoreline restoration (Exhibits 14 and 15) would presumably increase habitat along the river. See SEPA Mitigation Measure #4 related to stormwater discharge into the Cedar River. DocuSign Envelope ID: 99BA427F-FE67-49CC-B142-9BE0760232C1 City of Renton Department of Community & Economic Development Cedar River Apartments Staff Report to the Environmental Review Committee LUA19-000161, ECF, SA-M, SSDP Report of June 14, 2021 Page 11 of 16 SR_ERC_Cedar_River_Apts Mitigation Measures: None recommended. Nexus: Not applicable. 6. Environmental Health Impacts: Noise impacts would primarily result from the clearing of the site, construction of the proposed infrastructure improvements, and future construction of the multifamily and medical office buildings. 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. As the site is within 300-feet of a residential area, permitted work hours are limited to Monday through Friday between seven o’clock (7:00) a.m. and eight o’clock (8:00) p.m. Work on Saturdays is restricted to the hours between nine o’clock (9:00) a.m. and eight o’clock (8:00) p.m. No work is permitted on Sundays. Noise impacts would be temporary and associated with construction. The City’s construction standards are anticipated to adequately mitigate these impacts. Mitigation Measures: None recommended. Nexus: Not applicable. 7. Aesthetics Impacts: The proposed multifamily buildings (Buildings A and B) would be five (5) stories and approximately 60-feet in height at their highest point (Exhibits 6 and 7). Each building would contain a rectangle shape containing the internal multilevel parking structure that would be wrapped with residential units, amenity space, and ground floor commercial. Buildings would extend out with linear wings that add modulation and visual interest to the building while breaking down bulk and scale. The proposed two (2) multifamily buildings would be attached in the middle with a two (2) story leasing office and amenity space. Cladding for Buildings A and B include various colored fiber cement panel, metal panel, vinyl windows, commercial glazing, and architectural concrete. The medical office building would be one (1) story but contain high ceilings and upper level glazing resulting in a two (2) story appearance (Exhibit 9). Exterior cladding and articulation materials include brick, fiber cement panel, storefront glazing, parapet cap, and steel canopies. Mitigation of Cedar River view impacts would be via public access along the shoreline constructed by the applicant as a component of Phase 1 (Exhibit 16). Buildings would be subject Urban Design District ‘C’ Standards. Review of these standards would occur during each individual site specific site plan review application. It is anticipated that the City’s Shoreline Master Program regulations and Urban Design Standards would adequately mitigate aesthetic impacts of the proposal. Mitigation Measures: None recommended. Nexus: Not applicable. 8. Historic and Cultural Preservation Impacts: The City received a comment letter from the Duwamish Tribe on April 1, 2021 (Exhibit 37). The letter generally opposes the applicant’s proposal and indicates the subject property is located near a Duwamish Village the Tribe considers culturally significant and further states the site contains a high probability to have unknown archaeological deposits. The Washington State Department of Archeological and Historic Preservation online mapping system (WISAARD) identifies the site as Very High Risk for environmental factors with archaeological resources and highly advises a survey. In the comment letter, the Duwamish Tribe has requested an archeological survey be conducted in consultation with the Tribe. Therefore staff recommends as a mitigation measure the applicant submit an archeological survey prepared by a qualified professional with the civil construction permit application. DocuSign Envelope ID: 99BA427F-FE67-49CC-B142-9BE0760232C1 City of Renton Department of Community & Economic Development Cedar River Apartments Staff Report to the Environmental Review Committee LUA19-000161, ECF, SA-M, SSDP Report of June 14, 2021 Page 12 of 16 SR_ERC_Cedar_River_Apts Mitigation Measures: The applicant shall submit an archeological survey prepared by a qualified professional with the civil construction permit application. Consultation with Concerned Tribes shall occur prior to survey activities. Based on the results of the survey, an Inadvertent Discoveries Plan and onsite monitoring by a professional archeologist funded by the applicant may be required. Nexus: City of Renton Comprehensive Plan Policies L-45 and L-46; RCW 27.53 Archaeological Sites and Resources and RCW 27.44 Indian Graves and Records 9. Transportation Impacts: The subject property contains street frontage along Maple Valley Highway (SR169) and Cedar River Park Drive. Maple Valley Highway is owned and maintained by Washington State Department of Transportation (WSDOT) and is classified as a principal arterial by the City. Cedar River Park Drive is a typical City of Renton street and classified as a commercial access street. The applicant has proposed vehicle access on both Maple Valley Highway (right-in, right-out) and Cedar River Park Dive (full access). Initial Traffic Analysis The Traffic Impact Analysis (TIA), prepared by William Popp Associates dated July 6, 2020 (Exhibit 31), is the applicant’s most recent iteration intended to respond to comments by the City’s secondary reviewer Transpo Group (Exhibit 32) and WSDOT (Exhibit 33) on previous TIA drafts. The City’s Public Works Transportation staff indicated the applicant’s TIA evaluate the proposal’s AM and PM peak hour impacts on the following intersections: 1. SR 169/Sunset Way/Bronson Way/I-405 Southbound On-Ramp 2. SR 169/I-405 Northbound On-Ramp 3. SR 169/Shari’s Driveway 4. SR 169/Cedar River Park Drive The existing Level of Service (LOS) for AM/PM peak hour trips for the four (4) intersections are identified in the TIA as operating at LOS B or better with the exception of Intersection #1 that is operating at LOS E during the AM peak hour and LOS D in the PM peak hour. As noted in the TIA, all four (4) intersections are impacted by traffic on I-405 and ramp metering conditions for Intersections 1 and 2. Ramp congestion and queuing due to ramp metering results in spillback congestion through the four (4) intersections and these conditions are not able to be quantified in the typical Synchro software that was used to calculate existing LOS. City staff determined LOS estimates following project build-out would need to include the effects of I-405 metering. To quantify the metering effects, the applicant utilized a micro-simulation (Sim Traffic) analysis for AM/PM peak hour conditions at full project buildout and an additional six (6) year horizon as requested by WSDOT. The project’s trip generation at the completion of Phase 3 is estimated at 3,464 average weekday daily trips with 236 AM peak hour trips (97 in and 139 out) and 297 PM peak hour trips (152 in and 145 out). Half of all trips would go to I-405 (25% northbound and 25% southbound) with remaining trips headed to Downtown Renton (10%), North Renton (15%), Highlands (10%), and the remaining 15% dispersed eastbound on Maple Valley Highway toward Fairwood, Maple Valley, Black Diamond, and other easterly communities. Typical Synchro LOS analysis on the four (4) intersections resulted in limited impact with the applicant’s proposal at full buildout. LOS grading remains the same with project and without project in 2023 with the exception of Intersection #4 that falls from an LOS A and six (6) second delay to LOS B and 11 second delay. All intersections are anticipated to function at LOS D or better during the AM and PM peak hours. This analysis was based on WSDOT improvements to Intersection #1 that include a dual westbound left turn lane on SR 169 at the Sunset/Bronson/I-405 SB ramp intersection and the conversion of Sunset Blvd southbound to two general purpose lanes. DocuSign Envelope ID: 99BA427F-FE67-49CC-B142-9BE0760232C1 City of Renton Department of Community & Economic Development Cedar River Apartments Staff Report to the Environmental Review Committee LUA19-000161, ECF, SA-M, SSDP Report of June 14, 2021 Page 13 of 16 SR_ERC_Cedar_River_Apts Sim Traffic analysis identifies programmed WSDOT improvements at Intersection #1, improvements to the northbound I-405 HOV meter, forthcoming I-405 Express Toll Lanes, and the recently completed SR167 to I-405 Direct Connector are anticipated to improve operation in and around the subject property. The TIA indicates with these WSDOT improvements, the four (4) intersections are estimated to operate at LOS D or better in the AM and PM peak hour with the Project’s traffic at full buildout and at least six (6) years past that horizon year (2029) for the AM peak hour. The PM peak hour with and without the project in 2029 would operate at LOS C or better at Intersections 2-4. Intersection #1 would operate at LOS E with and without the project with a five (5) second delay with the project. Westbound AM peak hour through queue lengths on Maple Valley Highway measured from Intersection #4 are anticipated to be reduced from the existing average of 3,990-feet and maximum of 9,030-feet without applicant proposal and without programmed WSDOT improvements to 180-feet average and 520-feet maximum with applicant proposal and with WSDOT improvements in the 2023 horizon year. Potential queuing impacts were identified on northbound Cedar Park Drive with the Sim Traffic analysis. While the intersection is anticipated at a LOS B, maximum queues may extend into and/or block the subject property’s driveway. The TIA recommends a dual left turn lane, shared right turn lane, signage, and signal modifications. Therefore staff recommends as a mitigation measure, the applicant reconfigure the northbound Cedar River Park Drive to provide dual left turn lanes with a shared right turn lane (curb lane). To support this new channelization the applicant shall install signal detection, signal head modifications, and overhead signage on the east side mast-arm. The applicant shall submit plans to construct these off-site improvements with the civil construction permit application to be reviewed and approved by Development Engineering and Transportation staff prior to permit issuance. Independent Transportation Analysis Following review of the applicant’s TIA and Transpo Group’s secondary review of the analysis, the Environmental Review Committee directed City staff to further work with Transpo Group on review of the project’s transportation related impacts resulting in the Cedar River Apartment Independent Transportation and Mitigation Analysis, dated May 7, 2021 (Exhibit 34). The independent analysis was prepared using the applicant’s existing TIA with its associated data files and direction from Public Works Transportation Division staff. The analysis added two additional study intersections (N 3rd St and Sunset Blvd N and Bronson Way and Houser Way), removed the I-405 ETL project as it would not be completed until 2025, which is one year after the anticipated completion of the project, and included additional performance criteria such as intersection LOS and delay by intersection approach, vehicle hours of delay, and potential cut-through scenarios impacting Cedar River Park. Key findings from the independent analysis indicate all six (6) study intersections would operate a LOS D or better during AM and PM peak hours with the exception of Bronson Way/Houser Way which would operate a LOS F with and without the project and the N 3rd St/Sunset Blvd intersection would drop from an LOS D without the project to LOS E with the addition of the project related traffic in the peak hour. Additional impacts include the following: • The added project traffic would result in noticeable increase in delays on the northbound approach at the Maple Valley Highway / Cedar River Park Drive intersection. The delays would be particularly high during the AM peak hour due to congestion and vehicle queuing on Maple Valley Highway, thereby limiting available capacity for vehicles to exit the project site. • The average westbound vehicle queue length on Maple Valley Highway at the Cedar River Park Drive intersection during the AM peak hour is expected to increase by approximately 450 feet (35 percent) due to the addition of project related traffic and little available remaining capacity along the corridor. DocuSign Envelope ID: 99BA427F-FE67-49CC-B142-9BE0760232C1 City of Renton Department of Community & Economic Development Cedar River Apartments Staff Report to the Environmental Review Committee LUA19-000161, ECF, SA-M, SSDP Report of June 14, 2021 Page 14 of 16 SR_ERC_Cedar_River_Apts • The total vehicle hours of delay along Maple Valley Highway in the vicinity of the site would increase by approximately 20 percent with the addition of project traffic. • There is the possibility that between 15 to 24 project generated vehicles may utilize the route through Cedar River Park as alternative access due to travel time advantages of avoiding the I-405 / SR 169 interchange. The independent analysis has recommended mitigation focused on improving performance and reliability of the signal system at the Cedar River Park Drive/Maple Valley Highway intersection and along the Maple Valley Highway corridor in the immediate vicinity of the site utilizing an Adaptive Traffic Control System (ATCS). The adaptive system known as Split Cycle Offset Optimization Technique (SCOOT) would mitigate the project’s impact to vehicle queuing, intersection operations, and vehicle hours of delay along Maple Valley Highway. Therefore staff recommends as a mitigation measure the installation of an Adaptive Traffic Control System (ATCS) such as Split Cycle Offset Optimization Technique (SCOOT) fully funded by the applicant along intersections impacted by the proposal and those identified in the Cedar River Apartments Independent Transportation and Mitigation Analysis (Exhibit 34) prepared by Transpo Group dated May 7, 2021. The independent analysis has also recommended traffic calming measures within the Cedar River Park parking lot to discourage project related traffic from utilizing the Cedar River Park parking lot to bypass congestion around the I-405 interchange. Therefore staff recommends as mitigation measure the applicant identify and propose potential traffic calming measures to be located within the Cedar River Park parking lot to discourage project related cut-through traffic. Safety Collision history at the four (4) intersections over a three (3) year span indicates 74 total collisions, which results in less than one collision per million entering vehicles. The TIA states that recent Institute of Transportation Engineers (ITE) literature recommends intersections with more than one (1) collision per million vehicles may warrant additional analysis and the applicant’s proposal would unlikely create safety hazards or have a negative effect in collision rates. Parking The applicant proposes to provide parking to accommodate approximately 761 parking spaces at the completion of the project. Phase 1 would provide 306 structured parking spaces within Building A and 56 surface parking spaces. Phase 2 would provide 339 structured parking spaces within Building B. Phase 3 would provide 60 structured parking spaces within Building C (medical office building). RMC 4-4- 080F.10.d requires a minimum of one (1) parking space per attached dwelling unit and allows a maximum of 1.75 per unit. Commercial space (4,852 gross square feet proposed) is typically based on net square footage or dining room area for eating establishments and generally ranges from two (2) spaces per 1,000 net square feet and 10 spaces per 1,000 square feet of dining area. Medical dental offices (25,000 gross square feet proposed) require a minimum and maximum of five (5) spaces per 1,000 square feet of net floor area. The TIA anticipates a portion of the surface parking spaces to be allocated for the Phase 3 medical/office building and a portion of space within Phase 2 to be allocated for the commercial space. Compliance with parking requirements would be further analyzed with each specific administrative site plan review. Frontage Improvements and Concurrency The applicant would be required to construct street frontage improvements along Maple Valley Highway and Cedar River Park Drive. The applicant would be required to dedicate right-of-way in varying widths along the Maple Valley Highway frontage to accommodate a one-half (0.5) foot wide curb, eight (8) foot wide planter strip with street trees, eight (8) foot wide sidewalk, and two (2) foot wide clear zone DocuSign Envelope ID: 99BA427F-FE67-49CC-B142-9BE0760232C1 City of Renton Department of Community & Economic Development Cedar River Apartments Staff Report to the Environmental Review Committee LUA19-000161, ECF, SA-M, SSDP Report of June 14, 2021 Page 15 of 16 SR_ERC_Cedar_River_Apts behind the sidewalk. The applicant would also be required to dedicate right-of-way in varying widths along Cedar River Park Drive to accommodate a Transportation Division supported modification of the commercial access street standard. The curb line would remain in its location with a reconstructed one- half foot (0.5) wide curb, eight (8) foot wide planter strip with street trees, six (6) foot wide sidewalk, and two (2) wide clear zone behind the sidewalk. New channelization along the vehicle paved section per the above-referenced mitigation measure would also be required. The proposal has passed the City’s Traffic Concurrency Test per RMC 4-6-070.D (Exhibit 36), 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 future payment of Transportation Impact Fees. Mitigation Measures: a. The applicant shall reconfigure the northbound Cedar River Park Drive to provide dual left turn lanes with a shared right turn lane (curb lane). To support this new channelization the applicant shall install signal detection, signal head modifications, and overhead signage on the east side mast-arm. The applicant shall submit plans to construct these off-site improvements with the civil construction permit application to be reviewed and approved by Development Engineering and Transportation staff prior to permit issuance. b. The applicant shall fully fund the installation and configuration of the Adaptive Traffic Control System (ATCS) Split Cycle Offset Optimization Technique (SCOOT) along intersections impacted by the proposal including NE 3rd Street/Monterey Drive NE and those identified in the Cedar River Apartments Independent Transportation and Mitigation Analysis (Exhibit 34) prepared by Transpo Group dated May 7, 2021. Installation, configuration, and operation of the SCOOT system shall occur prior to Temporary Certificate of Occupancy of the first building. c. The applicant shall identify and propose potential traffic calming measures to be located within the Cedar River Park parking lot to discourage project related cut-through traffic. The traffic calming proposal shall be coordinated and approved by the Community Services Department. Approved traffic calming measures shall be installed prior to Temporary Certificate of Occupancy of the first building. Nexus: City of Renton Comprehensive Plan Goal T-A and RMC 4-6-060 Street Standards 10. 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. Mitigation Measures: None 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 39). ✓ 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). DocuSign Envelope ID: 99BA427F-FE67-49CC-B142-9BE0760232C1 City of Renton Department of Community & Economic Development Cedar River Apartments Staff Report to the Environmental Review Committee LUA19-000161, ECF, SA-M, SSDP Report of June 14, 2021 Page 16 of 16 SR_ERC_Cedar_River_Apts Environmental Determination Appeal Process: Appeals of the environmental determination must be filed in writing on or before 5:00 p.m. on July 1, 2021. Due to Governor Jay Inslee’s Proclamation 20-25 (“Stay Home, Stay Healthy”), the City Clerk’s Office is working remotely. For that reason, appeals must be submitted electronically to the City Clerk at cityclerk@rentonwa.gov. The appeal fee, normally due at the time an appeal is submitted, will be collected at a future date. 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. If the situation changes such that the City Clerk’s Office is open when you file your appeal, you have the option of filing the appeal in person. DocuSign Envelope ID: 99BA427F-FE67-49CC-B142-9BE0760232C1 CITY OF RENTON DEPARTMENT OF COMMUNITY AND ECONOMIC DEVELOPMENT STAFF REPORT TO THE ENVIRONMENTAL REVIEW COMMITTEE EXHIBITS Project Name: Cedar River Apartments Land Use File Number: LUA19-000161, ECF, SA-M, SSDP Date of Meeting June 14, 2021 Staff Contact Matt Herrera Current Planning Manager Project Contact/Applicant David Maul Rutledge Maul Architects 19940 Ballinger Way NE, Suite A-3, Shoreline, WA 98155 Project Location 1915 Maple Valley HWY, Renton, WA 98057 The following exhibits are included with the ERC Report: Exhibit 1: Environmental Review Committee (ERC) Report Exhibit 2: Boundary and Topographic Survey Exhibit 3: Site Plan Exhibit 4: Landscaping Plan Exhibit 5: Phasing Plan Exhibit 6: Elevations and Renderings Building A Exhibit 7: Elevations and Renderings Building B Exhibit 8: Floor Plans Buildings A and B Exhibit 9: Elevations and Renderings Medical Office Exhibit 10: Floor Plans Medical Office Exhibit 11: Civil Sheets (Grading, Storm Drainage, and Utility) Exhibit 12: Flood Boundary Map Exhibit 13: Compensatory Storage Plan Exhibit 14: Shoreline Site Plan and Sections Exhibit 15: Shoreline Landscaping Plan Exhibit 16: Shoreline Grading and Trail Plan Exhibit 17: Tree Retention Plan Exhibit 18: Arborist Report, prepared by the Watershed Company dated October 2018 Exhibit 19: Geotechnical Report prepared by Terracon Consultants, dated October 31, 2018 Exhibit 20: Bulkhead Wall Stability Addendum prepared by Terracon Consultants, dated June 10, 2019 Exhibit 21: Bulkhead Wall Stability Addendum No. 2 prepared by Terracon Consultants, dated May 21, 2020 Exhibit 22: Bulkhead Wall Stability Addendum No. 3 prepared by Terracon Consultants, dated July 24, 2020 Exhibit 23: Scour Analysis prepared by The Watershed Company, dated March 30, 2020 ( Revised July 10, 2020) Exhibit 24: Secondary Geotechnical Review Memoranda prepared by GeoEngineers, Inc., dated October 28, 2019, July 8, 2020, and October 12, 2020 DocuSign Envelope ID: 99BA427F-FE67-49CC-B142-9BE0760232C1 EXHIBITS CONT… SR_ERC_Cedar_River_Apts Exhibit 25: Channel Migration Risk Assessment Memorandum prepared by The Watershed Company, dated April 8, 2020 Exhibit 26: Conditional Letter of Map Revision Based on Fill (CLOMR-F) Form Exhibit 27: Critical Areas Report prepared by The Watershed Company, dated October 2018 Exhibit 28: Department of Ecology (DOE) No Further Action Letter, dated October 31, 2019 and Environmental Covenant recorded on July 16, 2020 Exhibit 29: Drainage Report (Technical Information Report), prepared by KPFF Consulting Engineers, dated January 11, 2019 Exhibit 30: Muckleshoot Indian Tribe Comments dated August 29, 2019 Exhibit 31: Traffic Impact Analysis (TIA) prepared by William Popp Associates, dated July 6, 2020 Exhibit 32: Secondary Transportation Review Memoranda prepared by Transpo Group, dated December 2, 2019 and April 29, 2020 Exhibit 33: Washington State Department of Transportation (WSDOT) Comments dated September 9, 2019 Exhibit 34: Cedar River Apartment Independent Transportation and Mitigation Analysis prepared by Transpo Group, dated May 7, 2021 Exhibit 35: Applicant Response to Transpo Group Analysis, dated June 7, 2021 Exhibit 36: Transportation Concurrency Test Memorandum, prepared by City of Renton Development Engineering Manager, dated November 6, 2020 Exhibit 37: Duwamish Tribe Comments dated April 1, 2021 Exhibit 38: Construction Mitigation Description Exhibit 39: Advisory Notes DocuSign Envelope ID: 99BA427F-FE67-49CC-B142-9BE0760232C1