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v oA <br /> A S S O C I A T E S I N C <br /> CONCLUSIONS <br /> Concentrations of TPHg and BTEX in wells MW1 through MW10 and CW remain consistent <br /> with the results from previous sampling events Detectable concentrations of MTBE were <br /> present in wells MW2, MW4, MW5, MW6, MW10, and CW It appears there are petroleum <br /> hydrocarbons remaining in the soil and groundwater The direction of groundwater flow and the <br /> magnitude of hydraulic gradient are generally consistent with the previous event Groundwater <br /> elevations have decreased since March 2002 <br /> RECOMMENDATIONS <br /> Based on the results of the Second Quarter 2002 monitoring episode, we recommend the <br /> following <br /> • Conduct the Third Quarter 2002 groundwater monitoring and sampling of wells MWI <br /> through MW10 and CW and analyze samples for TPHg and BTEX by EPA methods <br /> 80151$020 and MTBE, ETBE, TBA, TAME, and DIPE by EPA method 8260 <br /> • ATC has received an Authority to Construct from the San Joaquin Valley Air Pollution <br /> Control District for the vapor extraction system Once construction of the thermal <br /> oxidizer is complete, ATC will start up the vapor extraction and air sparge remediation <br /> 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 /> A-L <br /> Drew Van Allen <br /> Project Manager y4 r <br /> d � <br /> Jeanne Homsey, P E rade <br /> CA Registered Civil Engineer No 47410 <br /> cc Mr and Mrs Raymond Farmer <br /> Marty Hartzell, RWQCB <br /> w lwordpro1625961quan1yl2gr-2002 doc 4 <br />