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o Excavate clean overburden <br /> o Excavate soil ),1000 ppm TPH <br /> o Landfarm soil on-site <br /> o Excavate clean backfill on-site <br /> o Subgrade and repave previously paved areas <br /> o Fill backfill excavation with cleaned soil. <br /> Alternative #6 - Reinforce Shop Foundation, Excavation of Accessible Soils <br /> with TPH Concentrations 3-1000 ppm, Dispose at Class I Landfill <br /> o Remove existing asphalt paving <br /> o Install sheet piling <br /> o Excavate clean overburden <br /> a Excavate accessible soils >10,000 ppm TPH <br /> a Dispose of soils at Class I landfill <br /> o Purchase clean backfill <br /> a Subgrade and repave previously paved areas. <br /> Alternative #7 - Demolish Shop, Excavate All Soils with TPH Concentrations <br /> >10,000 ppm Landfarm Contaminated Soils On-Site <br /> a Remove existing asphalt paving <br /> o Demolish maintenance shop <br /> o Excavate clean overburden <br /> a Excavate soil 3,10,000 ppm TPH <br /> o Landfarm soil on-site <br /> o Excavate clean backfill on-site <br /> o Subgrade and repave previously paved areas <br /> o Fill backfill excavation with cleaned soil. <br /> 6-5 <br /> BS/0204b <br />