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264$5 THORNTON ROAD <br />' WKA No 2556 02 <br /> July 24, 1995 <br /> Page 2 <br /> I <br /> using EPA test method 602 Wells MW2 and MW3 were additionally analyzed for Volatile <br />' Halocarbons using EPA method 601 and Semi-volatile Organics using EPA method 625, as <br /> recommended in the Report of Secondary Investigation, dated May 4, 1995, provided by <br />' Groundwater Technology, Incorporated <br />' The two-inch diameter teflon bailer was cleaned with a solution of Liqui-nox and water prior to <br /> purging each well to minimize the potential for cross-contamination All water removed during <br /> sampling and purging operations was placed in a sealed and labeled 55-gallon drum and stored on <br />' site <br /> No free product or sheen was observed in monitoring wells MW1, MW2, or MW3, however, <br /> well MW2 emitted a moderate petroleum odor Analysis of water sample MW1 revealed no <br /> detectable concentrations of TPH as gasoline, TPH as diesel or BTEX Analysis of water sample <br /> MW2 revealed a TPH as gasoline concentration of 250 µg/P, BTEX and TPH as diesel were not <br /> detected Analysis of water sample MW3 revealed a TPH as gasoline concentration of 100 µg/f <br /> and a trace toluene concentration, TPH as diesel was not detected Volatile Halocarbons and <br /> Semi-volatile Organics were not detected in wells MW2 or MW3 Analytical results for ground <br />' water samples obtained from the three on-site monitoring wells are summarized in Table 2 <br /> Complete analytical results and chain-of-custody documentation are included in the Appendix <br /> The next quarter of ground water sampling is scheduled for the end of September, 1995 A <br /> Isummary of our findings will be transmitted upon completion of our ground water sampling field <br /> work Please call if you have any questions regarding this report <br /> Wallace ■ Kuhl & Associates, Inc <br /> I <br /> vl� - -- <br /> Robert Kull Eric Hubbard <br /> Staff Engineer Registered Geologist #4807 <br /> RK EH sdm cb <br /> Copy to Mr Steve Sasson/San Joaquin County <br /> aobMS&M-QTs INK <br /> WALLACE•KUHL <br /> Recyded paper &ASSOCIATES INC <br />