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3 3 Soil Vapor Extraction System Design <br /> Soil vapor will be extracted from one primary zone at the site This zone comprises unsaturated soil <br /> extending from approximately 6 to 15 feet bgs, vapor extraction wells W-1, W-2 and W-4 are <br />' screened through this interval To adequately address the treatment of soil from 6 feet bgs to the <br /> ground surface, slotted PVC piping will be placed horizontally in the bottom of the vapor extraction <br />' piping trench if the hydrocarbon impacted soil is encountered <br />' The results of the VET conducted by Canome did not specify an estimated radius of influence <br /> However, remediation sites in the Central Valley with simular lithologies have shown pneumatic <br />' properties which are favorable for soil vapor extraction and have influenced distances of 30 feet or <br /> greater A thorough evaluation of the ability of the vapor extraction system to treat the entire <br /> Izone of hydrocarbon impacted soil will be performed during the initial start-up and testing of the <br />' system Additional vapor extraction points will be installed if required <br /> 34 Emission Control System <br /> Based on the analytical results from the soil VET, an internal combustion (IC) engine will be <br />' appropriate to extract and abate hydrocarbon-bearing vapors from the subsurface The expected <br /> destruction efficiency for the IC engine will be approximately 95% A vapor extraction flow <br />' diagram is shown on Figure 7 <br />' The IC engine will be used to extract and abate hydrocarbon-bearing vapor recovered from three <br /> vapor extraction wells and the vapor extraction trench piping The IC engine is capable of <br />' effectively treating up to 150 cfm of soil vapor from the extraction wells The IC engine is equipped <br /> with a supplemental fuel management system which automatically controls the quantity of <br />' supplemental fuel (propane) supplied to the engine The supplemental fuel will be stored in a 499 <br /> gallon approved tank outside the remediation compound Influent and effluent hydrocarbon vapor <br />' samples, process temperature, and effluent temperature will all be measured as required for permit <br /> compliance and to ensure reliable operation of the system <br />' TOC1/34 HRP L O 4FAC�A <br /> NOoos-oo21i� A,@—26 1994 <br />