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♦ fft �h <br /> -- On May 1, 1990, the wells were purged of thra, we'll volumes and sampled. Each <br /> sample was collected with a new voss Technologies disposable bailer tG <br /> - eliminate any chance of cross contamination between wells. Samples were <br /> Placed in appropriately preserved bottles Supplied by the laborator <br /> y. 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 C). <br /> r; 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 /> analyzed by the following methods: <br /> Y.. <br /> • Modified EPA Methods 8015 and 8020 <br /> - Total Petroleum Hydrocarbons calculated as gasoline <br /> ` - Benzene, Toluene, Ethyl Benzene, and total Xylenes (BTEi() <br /> - Samples from!-4, adjacent to the waste oil and motor oil tank field, were <br /> also analyzed for the following: ! <br /> Modified EPA Method 8015 <br /> - Total Petroleum Hydrocarbons calculated as diasel ' <br /> • . Standard Methods 503E <br /> �• -.Oil and Grease <br /> EPA Methods 601 and 8010 <br /> F 1 <br /> - Halocarbons <br /> Groundwater samples collected from ffist-I, Mol-2, and MW-3 were also sent to BC <br /> Analytical in Emeryville, California for fecal coliform analyses as } Q <br /> •e aired <br /> ` by the special aermit. <br /> 4.0 RESULTS <br /> 4.1 SITE GEOLOGY iiYOltOGEOLOGY <br /> The site is underlain primarily by lean clay. A four-foot thick clayey sand <br /> layer was consistently observed in al]_borings-.attwenty-two s;et below grade - <br /> - -- - - - <br /> an comprises the primary water bearing unit encountered. <br /> a <br /> 4 <br /> 1:ENG:1024/072390 <br />