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3 PILOT TESTING <br /> Air emissions from the pilot tests stem will likely require a permit exemption from <br /> the San Joaquin Air Pollution Control District Off-gas from the soil vapor extraction <br /> (SVE) blower will be treated using granular activated carbon (GAC) prior to being <br /> emitted to the atmosphere Two GAC units will be used in series to safeguard against <br /> contaminant breakthrough and subsequent emission A request for a permit <br /> exemption will be prepared following Work Plan approval <br /> 3.1 Equipment <br /> Equipment to be used during the pilot testing activities includes an SVE <br /> blower, carbon adsorption vessels, an air sparging (AS) compressor, and <br /> assorted flow meters, gauges, hoses, and fittings Equipment layout locations <br /> are shown in Figure 5 A system process and instrumentation diagram is <br /> included as Figure 6 <br /> The SVE regenerative blower will be capable of a maximum free air flow of <br /> approximately 100 cubic feet per minute(cfm) Off-gas from the blower will <br /> be treated with GAC vessels in a series configuration <br /> The AS piston-type compressor will have a maximum free air flow capacity of <br /> approximately 12 cfm The compressor will be equipped with a coalescing <br /> filter and a carbon adsorption filter to safeguard against the introduction of <br /> additional hydrocarbons in the subsurface <br /> 3.2 SVE Pilot Test <br /> The first stage will involve pilot testing of SVE only at well VW-1 Well <br /> VW-1 is 25 feet deep, constructed of 4-inch diameter, Schedule 40 PVC <br /> material, and is screened from a depth of 5 feet to 25 feet Well construction <br /> of VW-I is shown in the Figures section <br /> Data from pilot testing activities will be recorded on forms included in <br /> Appendix B Baseline groundwater levels, soil gas pressures and dissolved <br /> oxygen concentrations will be monitored prior to initiating soil vapor <br /> extraction <br /> A brief step-vacuum test will then be performed to establish the optimum <br /> extraction flow rate and vacuum for performance of the pilot test Flow <br /> measurements will be collected at several extraction vacuums and the data <br /> will be entered on a rectilinear plot of flow rate vs vacuum As vacuum is <br /> incrementally increased, a point will be reached at which the relationship <br /> between flow and vacuum is no longer linear This point represents the <br /> 14 <br /> Pilot Testing Work Plan <br /> 1717 South Center Street-Stockton,California <br /> Prepared by Philip Services Corp <br /> H 16Nv\624001 121121382EG\Prole=\Sw-kCen4iloues>plan doe July 23,2002 <br />