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' volatile hydrocarbons were encountered in the groundwater samples collected from borings <br /> SB-1 through SB-4 and SB-6 upon analysis The water sample collected from SB-5 revealed <br /> 0 8 ppb toluene only, upon analysis <br /> 1 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 In July, 1994 attempts were made to <br />' sample the soils beneath the site building by drilling soil borings While detectable <br /> concentrations of diesel fuel were encountered in these borings, the extent of diesel impacted <br /> soil remains unknown due to equipment limitations and subgrade building foundation <br /> materials At this time, the quarterly monitoring program has resumed In the event that <br /> migration of the petroleum hydrocarbons located beneath the site building is encountered <br /> during quarterly monitoring activities, the necessity/feasibility of remedial actions will be <br /> addressed at that time <br /> 3.0 Quarterly Activities <br /> The wells were sampled and groundwater elevations recorded on July 27, 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 /> were 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 McCampbell Analytical Inc in Pacheco, California analyzed for TPH as gasoline and <br /> diesel (EPA Method 8015), and BTEX (EPA Method 8020) samples. <br /> MZ108-09-94/UST/94-0125 NBR 2 <br /> 1 <br />