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1444 MARIPOSA ROAD <br /> WKA No 2938 05 <br /> August 26, 1999 <br /> Page 5 <br /> ice, and submitted under chain-of-custody to a California-certified laboratory for analysis of <br /> TPHg using Modified EPA method 5015 and BTEX using EPA method 8020 The locations of <br /> the three monitoring wells is presented in Appendix B, exhibit 2 Copies of soil boring logs are <br /> ' included in Appendix C <br /> The soil borings were subsequently converted into four-inch diameter ground water monitoring <br /> wells (MW1, MW2 and MW3) Water samples were obtained from the wells and were <br /> immediately placed in an ice-chest containing ice and submitted under chain-of-custody to a <br /> California-certified laboratory for analysis of TPH using EPA method 8015 and BTEX using <br /> EPA method 8020 <br /> ' Laboratory analytical results of the soil samples collected during the installation of the three <br /> ground water monitoring wells revealed no detectable concentrations of TPHg Low but <br /> detectable concentrations of benzene were detected in samples obtained from depths of 60 to 70 <br /> feet in monitoring well MW1 and ethylbenzene was detected in the 70 foot sample from well <br /> MW2 <br /> Initial laboratory results for water samples collected from the wells revealed no detectable <br /> ' concentrations of TPH as gasoline, diesel, or motor oil However, benzene was detected in MW2 <br /> at a concentration of 1100 ug/l and xylene was detected in MW1 at a concentration of10 57 ug/1 <br /> A summary of analytical results for soil samples MW 1 through MW4 are included in Appendix <br /> A, exhibit 3 <br /> December 1993 <br /> The stockpiled soils generated during the original excavation were sampled a second time on <br /> December 3, 1993 after approximately 13 months of aeration Analytical results for samples <br /> obtained from stockpile#1, located southerly of the excavation, contained no detectable <br /> concentrations of TPH or BTEX Analytical results for samples obtained from stockpile#3 <br /> located northerly of the excavation,revealed an average TPHg concentration of 96 mg/kg <br /> 000 <br /> ' WALLACE KUHL <br /> Recycled paper &ASSOCIATES INC <br />