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volatile hydrocarbons were encountered in the groundwater samples collected from borings <br /> SB-1 through S13-4 and SB-6 upon analysis The water sample collected from SB-5 revealed <br /> 0 8 ppb toluene only, upon analysis <br /> In March 1993, IT Corporation submitted an "Offsite Investigation Report" to San Joaquin <br /> County Public Health Services (SJCPHS), Environmental Health Division, requesting site <br /> closure In a letter dated June 1, 1993, SJCPHS representatives requested further <br /> investigation of soil quality beneath the site building At this time, the quarterly monitoring <br /> program has resumed In the event that migration of the petroleum hydrocarbons located <br /> beneath the site building is encountered during quarterly monitoring activities, the <br /> necessity/feasibility of remedial actions will be addressed at that time. <br /> 3.0 Quarterly Activities <br /> The wells were sampled and groundwater elevations recorded on May 12, 1994. Water data <br /> was collected so gradient and flow direction could be calculated. Sampling procedures <br /> conformed to California Regional Water Quality Control Board and San Joaquin County <br /> Environmental Health guidelines At least three well volumes of water were purged prior to <br /> the collection of samples Purging and sampling data is contained in Appendix B <br /> After purging, each well was sampled with a new Voss Technologies disposable bailer <br /> Groundwater was transferred directly from the bailer to appropriately preserved bottles <br /> supplied by the laboratory A distilled water field blank was collected All sample bottles <br /> twere labeled then placed into "zip-loc" bags, sealed with security tape, and placed in a <br /> refrigerated ice chest Chain of custody forms accompanied the samples at all times <br /> (Appendix C) <br />' IT Analytical Services in Martinez, California analyzed for TPH as gasoline and diesel <br /> (EPA Method 8015), and BTEX (EPA Method 8020) samples. <br /> 4.0 <br /> Summary of Findings <br /> Survey and monitoring data indicated that groundwater flows to the east northeast with a <br /> gradient of 0.01 ft/ft (Figure 3) The water table was encountered at approximately 41 feet <br /> below grade Table 1 contains groundwater elevation data. <br /> MZ/05-17-94/UST/94-0075 NBR 2 <br />