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i <br /> 1444 MARIPOSA ROAD <br /> WKA No 2307 04 <br /> August 23, 1994 <br /> Page 2 <br /> The samples were immediately placed in an ice-chest with ice and submitted under chain-of- <br /> custody to a California-cernfled Iaboratory for analysts of Total Petroleum Hydrocarbons (TPH) <br /> as gasoline and motor oil using Modified EPA test method 8015, TPH as diesel using EPA test <br /> method 8270, and Benzene, Toluene, Ethylbenzene and Total Xylenes (BTEX) using EPA test <br /> method 8020 <br /> The submersible pump was cleaned prior to purging each well with a solution of Liqui-nox and <br /> water to minimize the potential for cross-contamination All water removed during sampling and <br /> purging operations was placed in sealed and labeled 55-gallon drums and stored on site <br /> No free product was observed in monitoring wells MW1, MW2, or MW3, however a petroleum <br /> odor was reported in MW2 Analytical results of water sample MWl revealed individual TPH as <br /> gasoline and benzene concentrations of 580 ug/f and trace concentrations of toluene and xylene, <br /> TPH as diesel, TPH as motor oil, and ethylbenzene were not detected Analytical results of <br /> water sample MW2 revealed TPH as gasoline and benzene concentrations of 2,300 ug/1 and <br /> 1,400 µglf, respectively, and trace concentrations of toluene, ethylbenzene, and total xylenes, <br /> TPH as diesel and motor oil were not detected Analytical results of water sample MW3 <br /> revealed a TPH as gasoline concentration of 68 Agl f and trace benzene and toluene <br /> concentrations, TPH as diesel and motor oil concentrations were not detected <br /> Based on the above analytical results, each of the three wells revealed significantly decreased <br /> benzene concentrations In addition, monitoring well MW2 revealed significant decreases in <br /> gasoline concentrations Analytical results for ground water samples obtained from the three on- <br /> site monitoring wells are summarized in Table 2 Complete laboratory reports and chain-of- <br /> custody documentation are appended <br /> The fourth quarter of ground water sampling is scheduled for November, 1994 A summary of <br /> our findings will be transmitted upon completion of laboratory testing <br /> i <br /> WALLACE•KUHL <br /> Rec7ded papa &ASSOCIATES INC <br />