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3 � <br /> Additional Assessment Report 5 <br /> Chevron USA Products Company, 2405 Airport Way, Stookton, California September 23, 1994 <br /> to sampling are included in Appendix D The groundwater samples were collected using disposable <br /> teflon samplers Prior to the collection of the water samples, a distilled-water field blank was collected <br /> to document ambient sampling conditions Each sample was labeled and placed on ice in an insulated <br /> container for delivery to GTEL under chain-of-custody manifest The samples were analyzed for BTEX, <br /> and TPH-G by EPA methods 5030/8020/modified 8015 <br /> 36 Wellhead Repair <br /> On July 7, 1994, Groundwater Technology personnel repaired one on-site groundwater monitoring <br /> wellhead (MW4) The wellhead had been damaged by a field plow during discing The top six inches <br /> of the casing and well box were broken The 2-inch casing was repaired by making a clean cut, using <br /> an inside-diameter PVC pipe cutter, below the broken portion (approximately 10 inches BGS) of the <br /> pipe A 6-inch long section of 2-inch-diameter schedule 40 PVC was coupled to the cut well casing <br /> such that 3 inches of space separates the top of casing and the lid of the well box The existing grout <br /> around the casing was cleared of soil and a new well box was set in concrete <br /> 37 DWR Records Vicinity Well Search <br /> • On July 11, 1994, Groundwater Technology conducted research on all well information held in the files <br /> of the California Department of Water Resources (DWR), Central District Office, in Sacramento, <br /> California, to locate wells within a 2,000-foot radius of the site Specifically, the owner's address, well <br /> depth, purpose/use of the well, and date of installation were recorded Information obtained from the <br /> DWR files indicates that seven wells exist within 2,000 feet of the site (Table 1) <br />• 50385UM RPT <br /> CD` GROUNDWATER <br /> TECHNOLOGY <br />