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samples were analyzed in a State of California-certified laboratory for the following: <br /> ■ TPH-d by EPA Method 8015M; <br /> ■ TPH-g by EPA Method 8015, <br /> ■ BTEX by EPA Method 8020, and <br /> ■ CCR Title 22 Metals <br /> Analytical results indicated that petroleum hydrocarbon levels achieved by the HEVF.I'O <br /> and bioremediation processes met Class III landfill disposal acceptance criteria. Table 3-1 <br /> presents the analytical results Accordingly, SSA hauled the soil to B & J Landfill Copies of <br /> laboratory reports and Chain-of-Custody records are included in Appendix B <br /> 32 Vapor Extraction/Injection System <br /> An in-situ vapor extractionlinjection system was installed within the north pit backfill to <br /> remove trace concentrations of hydrocarbons remaining in the walls and floor of the north pit <br /> and former diesel fuel dispenser excavation. To create an effective zone-of-influence, the <br /> extraction gallery was installed at 25 ft bgs and the injection gallery was installed at 15 ft bgs <br /> As illustrated in Drawing 3-3, vapors from the extraction gallery were treated by an in- <br /> situ extraction/reinjection process In this method, there were no discharges to the atmosphere <br /> The extracted hydrocarbon-laden aur was extracted from the soil using a vacuum blower. The <br /> aur was then passed through a water separator before treatment with twin activated carbon <br /> canisters Clean, compression-heated air, was then reinjected into the upper gallery of the <br /> system, thus accelerating the rate of remediation <br /> The system was operated for a period of eight weeks with periodic PID readings taken <br /> of the system influent and effluent When the influent system readings were less than 10 ppm, <br /> • the system was shut-down for a period of two weeks After the shut-down period, the system was <br /> FASCLOSE 3 3-3 42-1177102 36 <br />