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r <br /> 781 SWIFT WAY <br /> WKA No 1735 02 <br /> 10 August 19, 1994 <br /> Page 2 <br /> Water from the disposable bailer was decanted into appropriate sample containers provided by the <br /> Iaboratory <br /> The samples were immediately placed in an ice-chest with ice and submitted under cham-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 three-inch diameter submersible pump was cleaned prior to purging each well with a solution <br /> of trisodium phosphate and distilled water to minimize the potential for cross-contamination All <br /> water removed during sampling and purging operations was placed in sealed and labeled 55- <br /> gallon drums and stored on site. <br /> iNo free product was observed in monitoring wells MWI, MW2, and MW3, however, the water <br /> sample obtained from MWI had a sheen Analytical results of water sample MW1 revealed no <br /> detectable concentrations of TPH as diesel, motor oil, or BTEX, however, a product not typical <br /> of TPH as gasoline revealed a concentration of 240 µglf This product is more than likely <br /> partially biodegraded diesel related to the former diesel underground storage tanks Analytical <br /> results of water sample MW2 revealed no detectable concentrations of TPH or BTEX <br /> Analytical results of water sample MW3 revealed no detectable concentrations of TPH, toluene, <br /> ethylbenzene or total xylenes, however a trace concentration of benzene was detected Analytical <br /> results of the travel blank revealed a trace concentration of toluene and total xylenes This is <br /> likely the result of laboratory error and is considered insignificant since none of the water <br /> samples for the three wells revealed concentrations of toluene or total xylenes Analytical results <br /> for the ground water samples obtained from the three on-site monitoring wells are summarized in <br /> Table 2 Complete analytical results and chain-of-custody documentation are included in the <br /> Appendix <br />�1 <br /> WALLACE KUHL <br /> Recycled paper <br /> 6ASSOCIATfS INC <br />