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Alternative #2 - Capping with Groundwater Monitoring <br /> o Slurry seal existing asphalt on-site <br /> o Groundwater monitoring for 30 years. <br /> Alternative #3 - Demolish Shop, Excavate soils with TPH Concentrations <br /> >1000 ppm, Landfarm Contaminated Soils On-Site <br /> o Remove existing asphalt paving <br /> o Demolish maintenance shop <br /> o Excavate overburden material <br /> o Excavate soil >1000 ppm TPH <br /> o Landfarm soil on-site <br /> o Obtain backfill on-site <br /> o Fill backfill excavation with clean soils <br /> o Subgrade and repave previously paved areas, <br /> Alternative #4 - Demolish Shop, Excavate soils with TPH Concentrations <br /> >1000 mg/kg, Dispose at Class I Landfill <br /> o Remove existing asphalt paving <br /> o Demolish maintenance shop <br /> o Excavate overburden material <br /> o Excavate soils 3,1000 ppm TPH <br /> o Dispose of soils at Class I landfill <br /> o Purchase clean backfill <br /> a Subgrade and repave previously paved areas. <br /> Alternative #5 - Reinforce Shop Foundation, Excavate Accessible Soils with TPH <br /> Concentrations X1000 ppm, Landfarm Contaminated Soils On-Site <br /> o Remove existing asphalt paving <br />�} o Install sheet piling <br /> 6--4 <br /> BS/0204b <br />