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May 4, 1993 <br /> Unocal Station No_ 6981, Stockton, California Working To Restore Nature <br /> vapor-extraction wells are shown on Plate 16 <br /> From the results of the vapor-extraction test, the proposed well head design flow is 80 cubic <br /> feet per minute (cfm) per well, which is a total system flow of 480 cfm Utilizing a flow rate <br /> of 80 cfm, we estimate that an approximate 50 foot radius of influence will be created <br /> around each well It is estimated that this system will operate for approximately 1 to 2 <br /> i years <br /> L3 Process Controls <br /> I <br /> Process controls will be designed and constructed into the VES Within the remediation <br /> compound, each vapor extraction process line from individual wells will be equipped with <br /> a ball valve for flow rate control, insert ports for flowrate and vacuum measurement and <br /> I. sample ports for vapor sample collection <br /> .L4 Subgrade Plyln� <br /> F <br /> Polyvinyl chloride (PVC) piping (3-inch-diameter) will connect each vapor-extraction well <br /> head to a manifold at the compound The PVC piping will be placed in a trench at an <br /> approximate depth of 18 inches bsg The trench will be filled with sand and pea gravel and <br /> 1 resurfaced with asphalt or concrete <br /> 9.0 VAPOR-EXTRACTION SYSTEM, SOURCE TEST, MONITORING AND VAPOR <br /> SAMPLING <br /> 1 <br /> Before constructing the VES, an Authority to Construct will be obtained from the San <br /> Joaquin Valley Unified Air Pollution Control District (SJVUAPCD) After the VES is <br /> 1 constructed, RESNA will conduct one source test with the VES as per S3VUAPCD <br /> requirements. During the source test, a technician from RESNA will collect vapor samples <br /> from the effluent of the system at the frequency established in the Authority to Construct <br /> 38032-13 14 <br />