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HomeMy WebLinkAboutCM_Construction_Mitigation_Description_240607_v1STRIDE Bus Rapid Transit South Renton Transit Center (SRTC) Site Plan Review, Conditional Use Permit, Master Site Plan Review, and Lot Line Adjustment Application Attachment 4 Construction Mitigation Description June 2024 Prepared by the 1 South Renton Transit Center and Roadway Improvements Project Construction Mitigation Description The following narrative describes the items requested in the construction mitigation description as part of the City of Renton Conditional Use Application for the South Renton Transit Center Site (SRTC) project. a.Proposed Construction Dates (begin and end dates); •Construction mobilization is expected to begin in June 2025 •SRTC is expected to open for operation in January 2027. •Construction activities are proposed to continue from June 2025 through April 2027 b.Hours and Days of Operation; •Working hours and days of construction vary but would adhere to the City of Renton’s regulations to control construction noise, which restricts non-residential construction noise on weekdays to the hours of 7:00 a.m. to 8:00 p.m., and on Saturdays to the hours of 9:00 a.m. to 8:00 p.m. •If an unanticipated reason arises, and construction activities are required outside of regulated hours, Sound Transit would apply for a construction noise variance from the City of Renton. c.Proposed Hauling/Transportation Routes; •The South Renton Transit Center site has driveways/site access off Rainier Avenue S and S Grady Way. •Both Rainier Avenue S and S Grady Way are City of Renton designated haul routes for trucks over 26,000 pounds gross vehicle weight. •Access to the site is from I-405 and SR 167, continuing straight/north onto Rainier Ave S, and right/east onto the site. •Access from the site would exit right/west onto S Grady Way, turning right/north onto Rainier •Avenue S, and then left/west onto SW Sunset Boulevard/SR 900 to I-5. •SW Sunset Boulevard/SR 900 is a City of Renton designated haul route for trucks over 26,000 pounds gross vehicle weight. •As noted, project construction is anticipated to comply with Renton’s permitted construction hours. d.Measures to be implemented to minimize dust, traffic and transportation impacts, erosion, mud, noise, and other noxious characteristics; Best Management Practices The following Best Management Practices (BMPs) will be developed and implemented by the Contractor during construction to minimize dust, erosion, mud, and noise. Project grading and fill activities would occur on the South Renton Transit Center site. Dust Control 2 Measures to control dust during construction would also be implemented in compliance with the Puget Sound Clean Air Agency (PSCAA) and Sound Transit requirements. During project operation, exhaust from buses and from personal vehicles accessing transit facilities would be a source of local air pollutant emissions. •Develop a Temporary Erosion and Sediment Control Plan (TESCP), including measures such as catch basin protection. •Spray exposed soil with water or other dust palliatives to reduce emissions and deposition of particulate matter. •Cover all trucks transporting materials, wet materials in trucks, or provide adequate freeboard (space from the top of the material to the top of the truck) to reduce or avoid windblown deposition of particulate matter during transportation. •Provide wheel washes to remove particulate matter that vehicles would otherwise carry off site to decrease deposition of particulate matter on area roadways. •Remove particulate matter deposited on paved, public roads to reduce mud and resultant windblown dust on area roadways. Erosion Control The following measures would be incorporated into the project during construction to minimize the potential for erosion: •Implement a temporary erosion and sedimentation control plan with BMPs to prevent or minimize erosion and the potential for discharge of silt-laden runoff to nearby bodies of water. The plan would outline additional actions to achieve the intended environmental performance should any BMP not function as intended. •Develop appropriate construction procedures to maintain or enhance slope stability in areas underlain by landslides or with landslide-prone geology (i.e. Tukwila International Boulevard BRT Station and Roadway Improvements). The design through these areas would include suitable wall types, such as soldier piles with tiebacks, possibly supplemented with enhanced drainage, such as improved surface drainage or horizontal drains. •If needed, and in accordance with applicable regulations, drain suspected or observed seepage (i.e. Tukwila International Boulevard BRT Station and Roadway Improvements) to reduce the risk of landslide and surface sloughing by using gravel drainage blankets, French drains, horizontal drains, placement of a surface rock facing, or other appropriate methods. •Spray exposed soil with water or other dust palliatives to reduce emissions and deposition of particulate matter. •Cover all trucks transporting materials, wet materials in trucks, or provide adequate freeboard (space from the top of the material to the top of the truck) to reduce or avoid windblown deposition of particulate matter during transportation. •Provide wheel washers to remove particulate matter that vehicles would otherwise carry off-site to decrease deposition of particulate matter on area roadways. •Remove particulate matter deposited on paved, public roads to reduce mud and resultant windblown dust on area roadways. •Route and schedule construction trucks to reduce delays to traffic during peak travel times to reduce secondary air quality impacts caused by a reduction in traffic speeds while waiting for construction trucks. •Place quarry spall aprons where trucks enter public roads to reduce mud track-out. 3 •Require appropriate emission-control devices on all construction equipment powered by gasoline or diesel fuel to reduce carbon monoxide and nitrogen oxide emissions in vehicular exhaust. •Use relatively new, well-maintained equipment to reduce carbon monoxide and nitrogen oxide emissions and prohibit prolonged construction vehicle idling. •Require appropriate emission control devices on all construction equipment powered by gasoline or diesel fuel to reduce carbon monoxide and nitrogen oxide emissions in vehicular exhaust. •Plant vegetative cover as soon as possible after grading to reduce windblown particulates in the area. •Decontaminate construction equipment at the end of each day. Air Pollutants •Implementation of the type of best practices would reduce construction air emissions, and no further actions would be needed to address air emissions. •Operation of the project would not result in negative impacts to air quality, and operational mitigation is not proposed. •Construction-related activities would result in short-term emissions of air pollutants from worker and construction vehicle exhaust; no known off-site sources of emissions or odor would affect the project. •The PSCAA is responsible for enforcing air quality regulations in the Puget Sound region. The agency has developed fugitive dust regulations contained in Section 9.15 of Regulation 1 that would be followed during construction. •Sound Transit would prepare an Environmental Compliance Strategy Plan to track regulatory compliance and address air quality during construction activities. •To reduce air emissions during construction, the project is anticipated to use a suite of best practices, including some of the following as appropriate: •Construction-related activities would result in short-term emissions of air pollutants from worker and construction vehicle exhaust (carbon monoxide, nitrogen oxides, volatile organic carbon, particulate matter, and a set of pollutants referred to as Mobile Source Air Toxics (MSATs). MSATs include the following nine compounds: 1,3-butadiene, acetaldehyde, acrolein, benzene, diesel particulate matter, ethylbenzene, formaldehyde, naphthalene, and polycyclic organic matter. •Particulate matter could also be generated where soil would be disturbed with ground clearing and preparation, stockpiling of materials, and in the event that construction vehicles might track soil from sites onto area streets where other vehicles could stir up and release fugitive dust. •Construction activities are also likely to require temporary diesel-fired generators to provide power for electric equipment. Such generators would emit nitrogen oxides, carbon monoxide, particulate matter, and volatile organic carbon. •If emergency generators are required at any facility during construction, the PSCAA would be consulted for the appropriate permit action. •Disruption of traffic during construction (such as a temporary reduction of roadway capacity and increased queue lengths) could result in short-term, elevated concentrations of pollutants from slowed or idling vehicles. •During project operation, exhaust from buses and from personal vehicles accessing transit facilities would be a source of air pollutant emissions. As with vehicles used during construction, 4 common air pollutants from vehicle exhaust are carbon monoxide, nitrogen oxides, volatile organic carbon, particulate matter, and MSATs. •The project may increase localized air pollutant emissions at new transit facilities from vehicle trips generated by park-and-ride users, vehicles that pick up or drop off transit passengers, maintenance staff, and coach drivers. •All of the project components are located in an area that is designated by the U.S. Environmental Protection Agency (EPA) as in attainment for all criteria pollutants. Due to this area’s air quality status, a transportation conformity analysis is not required to demonstrate compliance with the EPA’s National Ambient Air Quality Standards. •The localized increases in vehicle activity from buses are not likely to cause or contribute to a potential exceedance of the National Ambient Air Quality Standards since the project is located in an area that is in attainment for all criteria air pollutants. •If emergency generators are required at any facility once in operation, PSCAA would be consulted for the appropriate permit action. Emergency combustion engines rated less than 500 hp are assumed to have a negligible contribution to pollutant emissions. Greenhouse gas (GHG) emissions from construction of the new park-and-ride facilities were estimated using the Federal Transit Administration (FTA) Transit GHG Emissions Estimator (FTA 2018). The FTA tool was used to prepare a simplified estimate for the facilities associated with each of the proposed project components. •Based on the total size of the transit center, 23,216 metric tons of carbon dioxide equivalent are expected to be emitted during construction of the project. GHG emissions from the facilities during operations would be negligible and limited to the energy required for lighting, electronic signage, and other electronic features. Noise •Minimize the use of generators. If generators are required, the PSCAA would be consulted for the appropriate permit action. •Ensure construction equipment uses high-grade engine exhaust silencers and engine casing sound insulation Mud •Place quarry spall aprons where trucks enter public roads to reduce mud track out. e.Any special hours proposed for construction or hauling (i.e. weekends, late nights); •No special hours are currently proposed for construction or hauling. If it is determined that additional hours are needed to complete construction, the contractor will coordinate with the City of Renton to obtain approval for such extended hours as required. f.Preliminary Traffic Control Plan •The project’s traffic control plan, described below, identifies measures that will be implemented to reduce traffic and transportation impacts. •During project activities, the contractor would stage the necessary equipment and materials on the site. Temporary lane closures on adjacent roadways would not be required. •The number of trucks entering and exiting the site would be expected to vary over the course of construction. 5 •The volume of trucks anticipated for hauling contaminated materials or bringing clean backfill to the site would not affect the current level-of-service on Rainier Avenue S, SR 167, I-405, or other adjacent local roads. •Route and schedule construction trucks to reduce delays to traffic during peak travel times to reduce secondary air quality impacts caused by a reduction in traffic speeds while waiting for construction trucks. •Pedestrian reroutes along S Grady Way would be clearly marked at crossings so pedestrians know where to cross.