HomeMy WebLinkAboutReg 2012-09-04 Public Hearing - Sound Transit UUP - Attachment F: NEPA/SEPA Mitigation CommentsTukwila Commuter Rail Station
Selected Mitigation Commitments
NEPA Environmental Assessment - January 2009 - Appendix B
BIOLOGICAL RESOURCES
1. Use appropriate best management practices (BMPs) to control potential water quality and quantity issues
during and after construction as described below under WATER QUALITY and HYDROLOGY.
WATER QUALITY and HYDROLOGY
1. Cover stockpiled soils, use sediment traps and ponds, clear areas just prior to construction, and replant
cleared areas as soon as possible.
2. Implement a spill control and prevention plan for all construction areas of the site. The plan shall include
such measures as clean-up procedures in the event of small and large spills and training for personnel on
the reduction and elimination of potential spill sources.
3. Minimize on-site refueling areas and areas of fuel or chemical storage. Berm, or curb and line with
impermeable materials all refueling areas where possible, and divert drainage away from these areas.
4. Maintain facilities for proper collection and disposal of any waste products, such as used motor oil
NOISE
1. Reduce construction noise with properly sized and maintained mufflers, engine intake silencers, engine
enclosures, and by turning off idle equipment. Specify in the construction contract that mufflers be in
good working order and that engine enclosures be used on equipment when the engine is the dominant
source of noise.
2. Place stationary pumps, compressors, welding machines, and similar equipment in continuous operation
as far away from sensitive receiving locations as possible. Where this is infeasible, place portable noise
barriers around the equipment with the opening directed away from the sensitive receiving property, as
appropriate.
AIR QUALITY
1. During construction, the construction contractor(s) will be required to comply with all relevant federal,
state, and local air quality laws, and would be required to prepare a plan for minimizing dust and odors
sufficiently to comply with PSCAA Regulation I, Sections 9.11 and 9.15.
2. Use only equipment and trucks that are maintained in optimal operational condition.
3. Require all off-road equipment to be retrofit with emission reduction equipment (i.e., require
participation in Puget Sound region Diesel Solutions by project sponsors and contractors).
4. Implement construction curbs on hot days when region is at risk for exceeding the ozone NAAQS, and
work at night instead.
5. Implement restrictions on construction truck idling (e.g., idling to maximum of 5 minutes).
6. Spray exposed soil with water or other suppressant to reduce emissions of PM10 and deposition of
particulate matter.
7. Pave or use gravel on staging areas and roads that would be exposed for long periods.
8. Cover all trucks transporting materials, wet materials in truck, or provide adequate freeboard (space from
the top of the material to the top of the truck bed), to reduce PM10 emissions and deposition during
transport.
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AIR QUALITY Cont.
9. Provide wheel washers to remove particulate matter that would otherwise be carried off-site by vehicles
to decrease deposition of particulate matter on area roadways.
10. Remove particulate matter deposited on paved, public roads, sidewalks, and bicycle and pedestrian paths
as a result of the project construction in order to reduce mud and dust; sweep and wash affected streets
regularly as needed during construction to reduce emissions.
11. Cover dirt, gravel, and debris piles as needed to reduce dust and wind-blown debris.
12. Route and schedule construction trucks to reduce delays to traffic during peak travel times.
ARCHAEOLOGICAL and CULTURAL RESOURCES
Sound Transit will implement the following mitigation measures to protect resources if any are uncovered:
1. Site excavation that extends below fill and into native soils will be monitored by a professional
archaeologist.
2. If archaeologically significant resources are encountered during proposed project construction, work shall
be halted while DAHP is consulted to determine an appropriate course of action.
3. Tribes with jurisdiction shall be notified in the event potentially significant Native American cultural
resources are discovered during excavations.
4. Sound Transit and FTA will prepare an Inadvertent Discovery Plan to be followed during station
construction and excavations into potential native soils.
GEOLOGY and SOILS
1. Address potential liquefaction or settling impacts to station facilities:
■ Implement proper subgrade preparation in embankments and paved areas and adopt modern
earthquake -resistant building methods and practices for station -related structures to help
minimize the potential for damage to structures or pavement during seismic events.
■ Establish emergency procedures that would detail specific responses to seismic events. The
responses shall include evacuating station facilities and inspecting the facilities for earthquake
damage. Emergency procedures shall be planned in coordination with local emergency service
providers.
UTILITIES and PUBLIC SERVICES
1. Coordinate with public services and utility providers through development of specific construction -related
mitigation measures such as, avoidance, scheduling of temporary disruptions, or replacement of facilities.
2. Coordination shall be on-going throughout the construction process.
SAFETY and SECURITY
1. Emergency telephones will be readily available for individuals to call for help if needed.
Emergency procedures for responding to earthquakes shall be established. In the event of an earthquake,
track work and bridges will be inspected thoroughly but rapidly, so service can resume as soon as it is safe
to do so.
2. Sound Transit shall follow Federal Railroad Administration (FRA) track safety standards and BNSF safety
standards.
3. Develop a safety plan for the proposed commuter rail station prior to the start of operation at the
permanent station. This plan will be developed in cooperation with Sound Transit Security staff, BNSF,
and Tukwila's Emergency Coordinator and will involve coordination with all local police and fire Safety
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SAFETY and SECURITY Cont.
departments to ensure that emergency access routes and procedures are understood by all parties. The
safety plan will also include detailed plans for the evacuation of trains and station areas in the event of an
emergency.
HAZARDOUS MATERIALS
Sound Transit commits to the following measures to mitigate for the potential of encountering hazardous
materials during construction:
1. Prepare a site safety plan, and spill prevention and countermeasures plan. Ensure that personnel are
trained to recognize potential hazards. If hazardous substances are encountered, they will be addressed
in accordance with applicable regulations.
2. Spill control plans and other site safety measures shall be implemented as part of the construction
process.
3. If any suspected contamination is encountered, proper protective equipment (clothing, gloves, breathing
equipment, etc.) and other measures, consistent with federal and state standards to provide a safer
working environment for construction workers will be used.
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