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a <br /> .V s� <br /> ATC <br /> A S S O C I A T E S I N C <br /> through MW7 THPd has never been detected in samples collected from wells MW5 through <br /> MW7 The lateral extent of the petroleum hydrocarbon plume in groundwater appears to be <br /> receding <br /> RECOMMENDATIONS <br /> Based on the results of the third quarter 2004 monitoring episode, we recommend the following <br /> • Conduct the fourth quarter 2004 groundwater monitoring of wells MW 1 through MW7 <br /> and analyze samples from MW1 and MW2 for TPHg, BTEX, and MTBE by EPA <br /> method 8015B 18260B quarterly No longer submit samples for TPHd and TPHk <br /> analyses Inspect well box conditions and maintain all well boxes in a water tight state <br /> • Sample MW3 through MW7 on an annual basis only, as suggested in the SJCEHD <br /> correspondence dated November 19, 2003 <br /> • Implement the Addendum to Corrective Action Plan and Site Conceptual Model as <br /> approved by SJCEHD in their correspondence dated March 17, 2004 <br /> Please contact our office at (209) 579-2221 if you have any questions <br /> Respectfully submitted, <br /> ATC Associates Inc <br /> S,��RED GEp� <br /> Mike Luksic, RG �� k C H OG, <br /> Staff GeologistCe <br /> E� ��� <br /> No 4450 <br /> Lorraine M Sawyer, R G #4450 ATF �F CAI�F���, <br /> Principal Geologist <br /> cc Ms Lori Shields, Diesel Performance <br /> Mr Jim Barton, RWQCB <br /> S 162577G3QR-2004 doc 4 <br />