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1 � <br /> SN�7'H <br /> RESULTS OF LABORATORY ANALYSES <br /> Water samples collected from each well were analyzed for TPHg, TPHd, and BTEX using <br /> modified EPA methods 8015/8020 These results and cumulative results of laboratory <br /> analyses are summarized in Table 1 The Chain of Custody Record and laboratory analytical <br /> reports are included in Appendix B. <br /> Results of this quarter's laboratory analyses of water samples from wells MW-1, MW-2, MW- <br /> 3, MW-4, MW-5 and MW-6 indicate the following <br /> ' o Concentrations of BTEX, TPHg, and TPHd were nondetectable in all wells. <br /> ' CONCLUSIONS <br /> Based on the results of this quarterly monitoring and previous work performed at the site, <br /> Smith Environmental concludes that the TPHg, TPHd, and BTEX concentrations in <br /> groundwater have remained nondetectable, consistent with the last monitoring episode in <br /> March 1995 <br /> Since monitoring was reinitiated in December 1992 the concentrations of TPHd, TPHg, and <br /> BTEX have steadily decreased to nondetectable levels and no longer appear to be impacted by <br /> petroleum hydrocarbons in soil beneath the site. This is a result of the continued operation of <br /> the soil vapor extraction system which began operating in July 1993. The vapor extraction <br /> ' system has removed over 3,700 pounds of a total estimated 3,900 pounds of petroleum <br /> hydrocarbons from soil beneath the site (RESNA, March 1993) The system is currently shut <br /> down due to electrical problems <br /> ' RECOMMENDATIONS <br /> ' Based upon the findings and conclusions of this and previous groundwater monitoring <br /> episodes, Smith Environmental recommends that soil confirmation borings be advanced and <br /> ' soil samples be collected for laboratory analysis. <br /> SCHEDULE <br /> tAn addendum to the work plan for advancing confirmation soil bonngs will be submitted to <br /> SJCPHS in August The field work will be performed and a closure report will be prepared. <br /> ' Upon case closure by SJCPHS, groundwater monitoring will be discontinued, the appropriate <br /> well destruction permits will be obtained, and the wells will be abandoned <br /> 540056%QUARTLYXZQTR1995 DOC <br />