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r <br /> GRANITE CONSTRUCTION FACILITY <br /> WKA No 2088 05 <br /> January 18, 1995 <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 and diesel using EPA test method 8015 modified and Benzene, Toluene, Ethylbenzene <br /> and Total 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 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 through MW6, however, well MW3 had <br /> a petroleum hydrocarbon odor Analysis of water samples MWi, MW2, and MW3 revealed <br /> TPH as gasoline concentrations of 190 ug/1, 760 ggl f and 410 ug/1, respectively, at least one or <br /> more BTEX constituents were detected in wells MW1, MW2, and MW3 Analysis of samples <br />. MW4, MWS, and MW6 revealed no detectable concentrations of TPH as gasoline, a trace <br /> concentration of benzene was detected in MW4 Analytical results for ground water samples <br /> obtained from the six on-site monitoring wells are summarized in Table 2, complete analytical <br /> results and chain-of-custody documentation is included in the appendix <br /> The fifth quarter of ground water sampling is scheduled for April, 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 /> r <br /> Robert Kull Eric Hubbard <br /> Staff Engineer Registered Geologist #4807 <br /> RNK EJH rbn <br /> Copy to Mr Harlan Knoll, San Joaquin Public Health Services <br /> Rob1208"5 QT4 <br /> `O% <br /> Recycled paWALLACE-KUHL <br /> per 6ASSOGIATES INC, <br />