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ATC Associates Inc <br /> (M%TC <br /> 1117 Lone Palm Avenue Suite B <br /> Modesto, Cahfomia 95351 <br /> . 209-579-2221 <br /> AS SOCIATES INC fax 209-579-2225 <br /> annually 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 2005 monitoring episode, we recommend the following <br /> • Conduct the fourth quarter 2005 groundwater monitoring of wells MW1 through MW7 <br /> and analyze samples from only MW 1 and MW2 for TPHg by EPA method 8015M, <br /> BTEX by EPA method 8021B, and fuel oxygenates including MTBE by 8260B quarterly <br /> Discontinue analyzing samples for TPHd and TPHk Inspect well box conditions and <br /> repair all well boxes in a water tight state <br /> • Sample MW3 through MW7 on an annual bans only, as suggested in the SJCEHD <br /> correspondence dated November 19, 2403 ATC additionally suggests the annual <br /> sampling be conducted in the second quarter (April) when the groundwater has <br /> seasonally been at its highest elevation <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 /> r <br /> a <br /> David Scrimger <br /> Staff Scientist <br /> � r'Zo, <br /> ;r <br /> Jeanne Homsey, P E <br /> CA Registered Civil Engineer No 47410 <br /> . cc Ms Lori Shields, Diesel Performance <br /> Mr Jim Barton, RWQCB <br /> S 16257712QR-2005 doc 4 <br />