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subsurface investigation ResUtts 5931 PAcifio Ave., Stockton, CA. Aegis Protect No. 99.020 "• Page 27 total petroleum hydrocarbons (TPH) organic lead, and ethyl dibromide as necessary. The methods used in the analyses of soil samples are described in Appendix A. The total volume of cuttings removed from the soil borings is expected to be between two and three cubic yards. Material removed from the borings will be placed on and covered by visquene. The cuttings will be sampled as outlined in section 5.0. The material generated during drilling will be legally disposed of upon confirmation of the contents from the analytical soil sample results. Two Vapor extraction wells will be installed using the soil _ borings. VE-1 will be drilled to a depth of 45 feet below grade. The purpose of VE-1 is volatilize petroleum hydrocarbons constituents in native soil. Construction details for VE-1 are presented in Figure 11. VE-2 will be drilled to a depth of 20 feet below grade. The purpose of VE-2 is to remove petroleum hydrocarbons in the, fill material located in the original tank basin. Construction details for VE-2 are presented on figure 12. 8.2 VAPOR EXTRACTION MANIFOLD SYSTEM The purpose of the vapor manifold system is volatilize the petroleum hydrocarbons in soils beneath the product lines. Figure 10 presents the specifications for the manifold systems. The maximum depth of the trenches will be .three feet to insure the integrity of the canopy footings. .0 y After the vapor extraction wells and associated piping system are installed, a pilot hydrocarbon vapor extraction test will be �w performed to assess advective air flow, and effluent discharge concentrations. This action will be permitted through the SJCHD -' and San Joaquin County Air Quality Management District. Results of the pilot test with recommendations will be submitted with three weeks of receipt of analytical results. i t.