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8.3 Insitu Treatment of Soil (Solidification/Stabilization) <br /> This option would chemically and physically immobilize the lead. In place treatment can be <br /> accomplished to a depth of approximately 1.5 feet (if carried to a depth of 2 feet the lower 6 <br /> inches would be removed, treated and replaced). A subcontractor, Lee Stabilization Company, <br /> would treat the lead contaminated soil in place using lime and fly ash. The treatment cements <br /> the soils in such a way that liquids cannot flow through in sufficient quantities to leach out the <br /> metal of concern. Additionally, the solubility of the lead is reduced chemically as the lime/fly <br /> ash mixture raises the pH of the treated soil. This company has successfully encapsulated leads <br /> at a 180,000 cubic yard Level 1 IT hazardous site at Vine Hill near Martinez, California, the <br /> lead-contaminated Harbor Way battery site in South San Francisco, and the Rosemond Super <br /> Fund site near the Kern County Line. <br /> With the concentrations of lead present at the site, this option would probably not provide <br /> significantly greater protection against exposure and leaching than would capping. For <br /> estimating purposes it is assumed that the treated area would coincide with area described under <br /> the paving option (2,300 ft ). The estimated cost of this option is approximately $ 27,000. <br /> Additional cost details are included in Attachment C. <br /> 8.4 Excavate Soil and Dispose <br /> This option would consist of excavating contaminated soil and transporting it to an appropriate <br /> landfill for disposal. The excavated area would then be backfilled and compacted. The soil <br /> would be stored on and covered with visquene, and composite samples would be submitted for <br /> laboratory analysis. Depending on the laboratory results, the soil would either be transported <br /> to Forward Landfill near Stockton (if non-hazardous waste) or to Kettleman Landfill near <br /> Kettleman City, California (if hazardous waste). <br /> This option would eliminate the potential for future human exposure or leaching at the site. <br /> However, temporary increased exposure could result during earthmoving activities and the <br /> potential for exposure and leaching would be transferred from the site to the landfill. <br /> For estimating purposes, it is assumed that the 2,300 ftp described under the paving option <br /> section would be excavated to a depth of approximately 2 feet. This would generate <br /> approximately 250 tons of material to be disposed. The estimated cost of this option if non- <br /> hazardous is approximately$28,000. Details on the estimated cost are contained in Attachment <br /> C. <br /> The estimated cost of this option if hazardous is approximately $ 90,000. Cost details are <br /> included in Attachment C. <br /> rays\t epoRa\summary 9 <br />