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C\YATC <br /> A S S O C I A T E S I N C <br /> RECOMMENDATIONS <br /> Based on the results of the second quarter 2003 monitoring event, we recommend the following <br /> • Continue quarterly monitoring and analyze samples from the monitoring wells for TPHg, <br /> BTEX, MTBE, ETBE, DIPE, TBA, TAME, 1,2-DCA, and EDB <br /> • Discontinue analyzing groundwater samples for TPHd <br /> • Perform a vapor extraction pilot test <br /> • Due to the obstruction in well MW10, ATC recommends abandoning the well by pressure <br /> grouting It is ATC's opinion that wells MW3 and MW4 provide adequate monitoring points <br /> west of the site to monitor the hydrocarbon plume and well MW10 does not need to be <br /> replaced <br /> • Perform subsurface investigation to evaluate vertical extent of petroleum impacted soil and <br /> groundwater <br /> Please contact our office at (209) 579-2221 if you have any questions or comments <br /> Respectfully submitted, <br /> ATC Associates Inc <br /> ohn Sellman <br /> Staff Geologist <br /> )A,,,,n- VI-Alk <br /> Drew Van Allen <br /> Senior Project Manager .0 <br /> i� iWNRE - <br /> "' "` K <br /> J NO e Hornsey, P E �-= <br /> CA Registered Civil Engineer No 47410 F-4,; - <br /> cc Mr Ra and Greer <br /> yin <br /> Mr James Barton, RWQCB <br /> File <br /> S\EnvJromenta112529IVcportsl2QR-2003 doe 4 <br />