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ti s , 111MR <br /> _ y <br /> :. mam <br /> �a ns <br /> w ' <br /> vv^v 9 <br /> INTERNAT€ONAL TECHNOLOGY CORPORATION <br /> r On May 1, 1990, the wells were purged of three well volumes and sampled. Each <br /> sample was collected with a new Voss Technologies disposable bailer to <br /> eliminate any chance of cross contamination between wells. Samples were <br /> placed in appropriately preserved bottles supplied by the laboratory. Once <br /> water samples were collected, they were placed in a refrigerated cooler. <br /> Chain of custody forms accompanied the samples at all times (Appendix Q. <br /> The samples were delivered, via courier, to ITAS in San Jose, California. <br /> Groundwater samples collected from each well as well as a trip blank, were <br /> f � <br /> analyzed by the following methods: <br /> • Modified EPA Methods 8015 and 8020 <br /> - - Total Petroleum Hydrocarbons calculated as gasoline <br /> - Benzene, Toluene, Ethyl Benzene, and total Xylenes (BTEX) <br /> Samples from MW-4, adjacent to the waste oil and motor oil tank field, were <br /> also analyzed for the following: <br /> • Modified EPA Method 8015 <br /> r.. <br /> - Total Petroleum Hydrocarbons calculated as diesel <br /> Standard Methods 503E <br /> Oil and Grease <br /> • EPA Methods 601 and 8010 <br /> Halocarbons <br /> Groundwater samples collected from MSI-1, MW-2, and MW-3 were also sent to BC <br /> "r <br /> Analytical in Emeryville, California for fecal coliform analyses as required <br /> by the special permit. <br /> 4.0 RESULTS <br /> 4.1 SITE GEOLOGY/HYOROGEOLOGY <br /> The site is underlain primarily by lean clay. A four-foot thick clayey sand <br /> _- ._.-------layer was-cons i stent ly-obser-ved-in-all-borings-at-twenty-two-feet-below- <br /> and comprises the primary water bearing unit encountered. <br /> t <br /> 4. <br /> ' l ,:ENG:7024/072390 <br />