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Surface Soils <br /> o No Action. <br /> o Excavation and disposal of soils exceeding arsenic <br /> action level of 130 mg/kg (parts per million, <br /> ppm) • <br /> o Excavation and disposal of soils exceeding arsenic <br /> upper background levels. <br /> Pipes and Culverts <br /> o No Action. <br /> o Remove and dispose of sediments from conduits <br /> associated with 130 mg/kg (ppm) soil action level. <br /> o Remove and dispose of sediments from conduits <br /> associated with upper background action level. <br /> Subsurface Soils <br /> o No Action. <br /> o Monitor deep soils and replace liner to cap <br /> shallow soils. <br /> o Remove and treat contamination from deep soils, <br /> monitor for effectiveness, and replace liner to <br /> cap shallow soils. <br /> o Remove and treat contamination from deep soils, <br /> monitor for effectiveness, excavate and treat <br /> shallow soils, place treated shallow soils in <br /> secure onsite disposal cell, and monitor disposal <br /> cell for effectiveness. <br /> Groundwater <br /> o No Action. <br /> o Extract, collect, and treat groundwater at 200 <br /> gallons per minute (GPM) , rate which contains <br /> contaminant migration; provide alternative water <br /> supply to private well users potentially affected <br /> by existing contamination. <br /> o Extract, collect, and treat groundwater at 500 <br /> GPM; and provide alternative water supply. <br /> o Extract, collect, and treat groundwater at 1, 000 <br /> GPM; and provide alternative water supply. <br /> ES-4 <br />