COMPLIANCE INFO_CASE 1 - Laserfiche WebLink

Home Browse Search

Implementation of this option would provide additional protection against human exposure to the lead by eliminating the possibility of dust inhalation or direct contact. The option would provide additional protection against leaching of the lead by isolating the contaminated soil from rainfall infiltration. The estimated cost of this option was approximately $9,100. 8.3 Insitu Treatment of Soil (Solidification/Stabilization) This option would chemically and physically immobilize the lead. In place treatment can be accomplished to a depth of approximately 1.5 feet. A subcontractor would treat the lead contaminated soil in place using lime and fly ash. The treatment cements the soils in such a way that liquids cannot flow through in sufficient quantities to leach out the metal of concern. Additionally, the solubility of the lead is reduced chemically as the lime/fly ash mixture raises the pH of the treated soil. With the concentrations of lead present at the site, this option would not provide significantly greater protection against exposure and leaching than would capping. For estimating purposes it was assumed that the treated area would coincide with area described under the paving option (2,300 ft'). The estimated cost of this option was approximately $27,000. 8.4 Excavate Soil and Dispose This option would consist of excavating contaminated soil and transporting it to an appropriate landfill for disposal. The excavated area would then be backfilled and compacted. The soil would be stored on and covered with visquene, and composite samples would be submitted for laboratory analysis. Depending on the laboratory results, the soil would either be transported to Forward Landfill near Stockton (if non-hazardous waste) or to Kettleman Landfill near Kettleman City, California (if hazardous waste). This option would eliminate the potential for future human exposure or leaching at the site. However, temporary increased exposure could result during earthmoving activities and the potential for exposure and leaching would be transferred from the site to the landfill. For estimating purposes, it was assumed that excavation would generate approximately 250 tons of material to be disposed. The estimated cost of this option if non-hazardous was approximately $28,000. The estimated cost of this option if hazardous was approximately $90,000. 9.0 RECOMMENDED ALTERNATIVE Based on the site conditions, property use, lack of health threat and lack of threat to groundwater Ground Zero recommended adopting either the No Action or the Paving Option. This recommendation was presented in the report Summary of Soil Contamination Investigations and Soil Remediation Plan dated November 21, 1997. roy.Vq)0M\ rPt 9