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.s <br /> GRANITE CONSTRUCTION FACILITY <br /> WKA No 2088 05 <br /> August 15, 1994 <br /> Page 2 <br /> Petroleum Hydrocarbons (TPH) using EPA test method 8015 modified, and Benzene, Toluene, <br /> Ethylbenzene and Total Xylenes (BTEX) using EPA test method 8020 <br /> The submersible pump was cleaned prior to purging each well with a solution of trisod:um <br /> phosphate and water to minimize the potential for cross-contamination All water removed <br /> during sampling and purging operations was placed in sealed and Iabeled 55-gallon drums and <br /> stored on site <br /> No free product was observed in monitoring wells MW1 through MW6 However, well MW3 <br /> had a petroleum hydrocarbon odor Analysis of water samples MW 1, MW2 and MW3 revealed <br /> TPH as gasoline concentrations of 670 ug/f, 1,100 µg/f and 570 ug/f, respectively Analytical <br /> results of MW4, MWS, and MW6 revealed no detectable concentrations of TPH as gasoline <br /> Ground water samples from MW1 through MW6 revealed no detectable concentrations of TPH <br /> • as diesel Motor oil concentrations of 110 gg/P and 120 µgIf were detected in MWI and MW3, <br /> respectively, MW2, MW4, MWS and MW6 revealed no detectable concentrations of TPH as <br /> motor oil Analytical results for ground water samples obtained from the six on-site monitoring <br /> wells are summarized in Table 2 <br /> The fourth quarter of ground water sampling is scheduled for November, 1994 A summary of <br /> our findings will be transmitted upon completion of laboratory testing Please call if you have <br /> any questions regarding this report <br /> Wallace ■ Kuhl & Associates, Inc <br /> Robert Kull Eric Hubbard <br /> Staff Engineer Registered Geologist (#4807 <br /> RNK EJH rbn <br /> R*W083-05 QT2 <br /> NNW <br /> er WALLACE KUHL <br /> Recycled pap <br /> Er ASSOCIATES INC: <br />