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Jun 24 05 07: 48a RRA' Enviro 1 9?5 277 1781 p. 9 . <br /> Remedial Feasibility Evaluation <br /> Diesel Impacted Soil <br /> CCTC Site <br /> 1645 Cherokee Road, Stockton, CA <br /> Approximate area of impact: 18,000 cubic feet (1,050 tons) <br /> Summary of Geological Litholocgy <br /> of affected area: The primary area of impact is located between <br /> depths of 10 to 40 feet below grade surface (bgs). <br /> The lithology of the soil encountered at these <br /> depths as described by the Woodward Clyde and <br /> HETI Boring Logs is comprised of very stiff silty <br /> sand, firm to very tight clayey silt, and silty clay. No <br /> quantifiable groundwater exists within the area of <br /> impact. <br /> Soil Vapor Extraction <br /> Remedial Effectiveness: The tight soil conditions found at this site combined <br /> with the inability of diesel to readily volatilize may <br /> impede the progress of effectively removing the <br /> hydrocarbon mass to the desire action level. This <br /> method will also require a lengthy timeline for <br /> remedial completion. <br /> Required Resources: Installation of a minimum of 4 vapor extraction <br /> wells. Installation of vapor extraction pipe trenches. <br /> Construction of a treatment pad which will contain a <br /> blowerlvacuum pump, thermal oxidizer, and carbon <br /> scrub units. Installation of a secondary power <br /> source. <br /> Associated Cost: Approximately $280,000 <br /> Excavation <br /> Remedial Effectiveness: Remediation by excavation will allow the cleanup to <br /> proceed in a more simple, complete and defined <br /> manner. It will also allow for the corrective action to <br /> be completed in a timely manner that will foster a <br /> more expeditious case closure. <br /> Required Resources: Excavator and loaders. Removed impacted soil will <br /> be off-hauled and disposed off at a local landfill. <br /> Associated Cost: Approximately$190,000 <br />