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1444 MARIPOSA ROAD <br /> WKA No 2307 04 <br /> November 7, 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-certified laboratory for analysis of Total Petroleum Hydrocarbons (TPH) <br /> using Modified EPA test method 8015 and Benzene, Toluene, Ethylbenzene and Total Xylenes <br /> (BTEX) using EPA test method 602 <br /> The submersible pump was cleaned with a solution of Liqui-nox and water prior to purging each <br /> well, 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 /> hydrocarbon odor was reported in MW2 Analysis of water sample MW I revealed a TPH as <br /> gasoline concentration of 1,500 ug/f, a benzene concentration of 710 µgli, and a trace xylene <br /> concentration, TPH as diesel, TPH as motor oil, toluene, and ethylbenzene were not detected <br /> Analysis of water sample MW2 revealed TPH as gasoline and benzene concentrations of 6,400 <br /> ug/f and 980 µg/P, respectively, and trace concentrations of toluene, ethylbenzene, and total <br /> xylenes, TPH as diesel and motor oil were not detected Analysis of water sample MW3 <br /> revealed no detectable concentrations of TPH or BTEX <br /> Based on the above analytical results, wells MW 1 and MW2 revealed significantly increased <br /> gasoline concentrations, however, well MW3 revealed no detectable concentrations Analysis of <br /> ground water samples obtained from the three on-site monitoring wells are summarized in Table <br /> 2 Complete laboratory reports and chain-of-custody documentation are appended <br /> The fourth quarter of ground water sampling is scheduled for January, 1995 A summary of our <br /> findings will be transmitted upon completion of laboratory testing <br /> In January, 1994 a soil vapor extraction system was installed onsite at the location of the former <br /> excavation We recommend performing a soil vapor extraction pilot test to determine the most <br /> effective and efficient remediation method We additionally recommend constructing <br /> approximately three additional ground water monitoring wells and approximately two soil borings <br /> INK <br /> WALLACE KUHL <br /> Recycled paper 6 ASSOCIATES INC <br />