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c2R\ <br /> • A S S O C I A T E S I N C <br /> EPA Method 8021B, and oxygenate fuel additives MTBE, ethyl tertiary butyl ether (ETBE), di- <br /> isopropyl ether (DIPS), tertiary butyl alcohol (TBA), tertiary amyl ether (TAME), 1,2- <br /> dichloroethane (1,2-DCA), and 1,2-dibromoethane (EDB) utilizing EPA Method 8260B <br /> Groundwater well purge and sample logs are contained in Attachment 1 <br /> ANALYTICAL RESULTS <br /> TPHg was detected in samples collected from wells MW-1, MW-2, MW-1P, MW-2P, and MW- <br /> 3P BTEX constituents were detected in samples collected from wells MW-2P and MW-1 <br /> MTBE was detected in the samples from wells MW-1, MW-2P, and MW-3P DIPE was <br /> detected in the samples from wells MW-1P, MW-2P, MW-3P, MW-5P, and MW-6P TBA was <br /> detected in the samples from wells MW-1P, MW-2P and MW-3P 1,2-DCA was detected in <br /> samples from MW-1P, MW-3P, MW-5P, and MW-6P A summary of analytical results is <br /> presented in Table 2 Laboratory data sheets and chain-of-custody documentation are contained <br /> in Attachment 2 <br /> RECOMMENDATIONS <br /> Based on the results of the first quarter 2004 monitoring episode, we recommend a second <br /> quarter 2004 monitoring and reporting event Groundwater samples should be analyzed for <br /> TPHg, BTEX, and fuel oxygenates including MTBE <br /> Please contact our office at (209) 579-2221 if you have any questions or comments <br /> Respectfully submitted, <br /> ATC Associates Inc <br /> Mike Luksic, RG - a <br /> Staff Geologist F � �4" <br /> "ps u +f. <br /> 4rax-11ky,lax, <br /> 5 S"e L Ii.J1]J fre p <br /> Jeanne Homsey, P E <br /> CA Registered Civil Engineer No 47410 <br /> i-. <br /> cc Chuck Miller, USA Petroleum Corp <br /> Jim Barton, RWQCB <br /> • <br /> s lenv,,onmental12591210003-Stoekton\Qua tly11QR-2004 dao 3 <br />