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May 4, 1993 ���� <br /> Unocal Station No 6981, Stockton, California Working To Restore Nature <br /> E <br /> and notification to the City of Stockton Fire Department will also be obtained prior to the <br /> system installation <br /> 8.0 SYSTEM COMPONENTS <br /> 11 Additional Vapor Extraction Wells <br /> I <br /> The existing vapor extraction wells are screened from approximately 25 to 50 feet below <br /> surface grade (bsg) This construction will not adequately address soil containing <br /> hydrocarbons above approximately 25 feet bsg RESNA proposes to install two additional <br /> vapor extraction wells onsite as shown on Plate 15 to address the soil containing <br /> hydrocarbons above 25 feet bsg <br /> The extraction wells will be constructed with thread pointed,4-inch-inner-diameter, schedule <br /> 40 polyvinyl chloride (PVC) casing The screened portion of the wells will consist of factory- <br /> perforated casing with 0 10-inch-wide slots The well screen will extend from approximately <br /> 30 feet to 5 feet bsg <br /> 1 <br /> The wells will be located approximately 6 feet east of B-11/VW-2 and 11 feet northwest of <br /> B-3 Using a similar radius of influence of 50 feet, these locations should address the <br /> shallow soil containing hydrocarbons <br /> 82 Vaoor Extraction Sytem <br /> The vapor extraction wells will be connected to a vapor extraction system (VES) which will <br /> draw hydrocarbon vapors out of the soil The major components of the VES are 1) either <br /> a catalytic oxidizer or thermal oxidizer (under evaluation), 2) a water vapor removal system <br /> for removing trapped condensate in the vapor-extraction piping, 3) subsurface system piping, <br /> other associated piping, control valves, sampling ports, and instrumentation The proposed <br /> location of the remediation compound and the piping system between the compound and <br /> r 3W32-13 13 <br />