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*CbCurtis & Tompkins, Ltd., Analytical Laboratories, Since 1878 <br /> 2323 Fifth Street Berkeley CA 94710 Phone(510)486-0900 <br /> 22 July 1993 <br /> Ms Sue Wickham <br /> Environmental Science & Engineering <br /> 4090 Nelson Avenue <br /> Suite J <br /> Concord, CA 94520 <br /> RE: ESE Project# 6-92-5009 <br /> Dear Sue: <br /> Curtis & Tompkins recently completed work (Laboratory Number 1.11480) in <br /> support of the above-referenced pro3ect. Analyses included three <br /> samples for Total Extractable Hydrocarbons (TEH) . <br /> Samples identified by ESE as MW-1, Dup and MW-4 each showed diesel range <br /> hydrocarbons quantitated at 200 ug/L. The chromatographic patterns of <br /> these three samples are very similar; each shows a slight rise in the <br /> baseline in the C12-•C22 (diesel) range as well a few relatively small <br /> individual peaks. This pattern does not match that of a fresh diesel <br /> fuel. We believe that this pattern represents either a very weathered <br /> diesel or similar carbon range material. <br /> Chromatograms for these samples and the diesel standard are enclosed. <br /> If you have any further questions, please feel free to call. <br /> Sincerely, <br /> CURTIS & TOMPKINS, LTD. <br /> Johft Goyette <br /> Operations Manager <br />• <br /> Berkeley Los Angeles <br />