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4 <br /> GRANITE CONSTRUCTION FACILITY <br /> WKA No 2088 05 <br /> October 20, 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 /> as gasoline using EPA test method 8015 modified, and Benzene, Toluene, Ethylbenzene and Total <br /> Xylenes (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 nummize the potential for cross-contamination All water removed during sampling and <br /> purging operations was placed in sealed and Iabeled 55-gallon drums and stored on site <br /> No free product was observed in monitoring wells MWI through MW6, however, well MW3 had <br /> a petroleum hydrocarbon odor Analysis of water samples MW1, MW2, and MW3 revealed <br /> TPH as gasoline concentrations of 290 ug/Q, 84 AgIf and 670 ug/1, respectively, at least two of <br /> the BTEX constituents were detected in each well Analytical results of MW4, MW5, and MW6 <br /> revealed no detectable concentrations of TPH as gasoline, however a trace concentration of <br /> toluene was detected in MW6 Analytical results for ground water samples obtained from the six <br /> on-site monitoring wells are summarized in Table 2, complete analytical results and chain-of- <br /> custody documentation is included in the Appendix <br /> The fourth quarter of ground water sampling is scheduled for January, 1995 Our next quarterly <br /> report will be transmitted upon completion of laboratory testing Please call if you have any <br /> questions regarding this report <br /> Wallace ■ Kuhl & Associates, Inc <br /> ��7e <br /> Robert Kull Eric Hubbard <br /> Staff Engineer Registered Geologist #4807 <br />. RK EH sdm <br /> Copy to Mr Harlin Knoll, San Joaquin Public Health Services `0% <br /> %*U08"5 <br /> WALLACE KUHL <br /> Reryi led paper E.ASSOCIATES INC <br />