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v o <br /> A S S O C I A T E S I N C <br /> CONCLUSIONS <br /> Concentrations from wells MW1 through MW6 and MW9 remain consistent with the results <br /> from the previous sampling event 7&ncentrations in well MW10 decreased by one order ofK <br /> magnitude, and concentrations in wells MW7 and MW8 increased by as much as one order ofl� 4?magnitude The direction of groundwater flow was consistent with the previous monitoring Jv� <br /> event Groundwater elevations have decreased since June 2002 <br /> RECOMMENDATIONS <br /> Based on the results of the third quarter 2002 monitoring episode, we recommend the following <br /> • Conducting the fourth quarter 2002 groundwater monitoring and sampling of wells MWl <br /> through MW10 and DW and analyze samples for TPHg, BTEX, and oxygenate fuel <br /> additives <br /> • Continue to monitor well MW2 for floating free product and maintain skimmer system <br /> • Install a soil vapor extraction system <br /> Please contact our office at (209) 579-2221 if you have any questions or comments <br /> Respectfully submitted, <br /> ATC Associates Inc <br /> Jim Kundert <br /> Staff Geologist <br /> 'DAV".j <br /> V <br /> Drew Van Allen <br /> Senior Project Manager �or � , <br /> � M <br /> Je&eHomsey, P E g u F <br /> CA Registered Civil Engineer No 47410 <br /> cc Mr Phil Cohn <br /> Mr Warren Triesman <br /> Marty Hartzell, RWQCB <br /> w 1163931quar11yl3gr-2002 doc 5 <br />