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1766 MONTE DIABLO AVENUE <br /> WKA No 2738 01 <br /> July 15, 1994 <br /> Page 2 <br /> MW2, MW3, and MW4 using a two-inch submersible pump until temperature, pH, and <br /> conductivity readings stabilized and/or the water cleared of sediment The water samples were <br /> then collected using a new polyethylene disposable bailer Water from the disposable bailer was <br /> decanted into appropriate sample containers provided by the laboratory <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 /> using EPA test method 8015 modified, and Benzene, Toluene, Ethylbenzene and Total Xylenes <br /> (BTEX) using EPA test method 602 <br /> The submersible pump was cleaned prior to purging each well with a solution of trisodium <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 labeled 55-gallon drums and <br /> stored on site <br /> Analysis of water samples obtained from monitoring wells MW3 and MW4 revealed TPH as <br /> gasoline concentrations of 2,600 uglf and 100,000 Aglf, analytical results from monitoring well <br /> MW2 revealed no detectable concentrations of either TPH as gasoline or BTEX Analytical <br /> results for ground water samples obtained from MW2, MW3, and MW4 are summarized in <br /> Table 2 <br /> The next quarter of ground water sampling is scheduled for September, 1994 A summary of <br /> our findings will be transmitted upon completion of Iaboratory testing Please call if you have <br /> any questions regarding this report <br /> Wallace ■ Kuhl & Associates, Inc <br /> G� AteLi <br /> Robert Kull Eric Hubbard <br /> Staff Engineer Registered Geologist #4807 <br /> . RNK KMB EJH rbn <br /> 1tabC738-01 QT1 <br /> e <br /> WALLACE KUHL <br /> RmcdedpaW &ASSOCIATES INC <br />