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v <br /> • A S S O C I A T E S I N C <br /> gradient on September 23, 2002 was calculated to be 0 009 ft/ft or approximately 46 ft/mile A <br /> summary of groundwater monitoring data is presented in Table 1 <br /> CONCLUSIONS <br /> Concentrations of TPI-Ig 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 June 2002 <br /> RECOMMENDATIONS <br /> Based on the results of the Third Quarter 2002 monitoring episode, we recommend the <br /> following <br /> Conduct the Fourth Quarter 2002 groundwater monitoring and sampling of wells MW 1 <br /> through MW10 and CW and analyze samples for TPI-Ig and BTEX by EPA methods <br /> 8015/8020 and MTBE, ETBE, TBA, TAME, and DIPE by EPA method 8260 <br /> • <br /> Please contact our office at(209) 579-2221 if you have any questions or comments <br /> Respectfully submitted, <br /> ATC Associates Inc <br /> John Sellman <br /> Staff Geologist <br /> All, <br /> Drew Van Allen � '� 1 <br /> Senior Project ManagerVs JUNK <br /> N'!1j� .r.1q4(4E1g0 <br /> 2J :lHom <br /> ai <br /> P E Yw <br /> CA Registered Civil Engineer No 47410 <br /> t 4Y� tl R[.s wr N ti M.� L <br /> cc Mr and Mrs Raymond Farmer , <br /> wS� <br /> . Marty Hartzell, RWQCB <br /> w lwordpro162596%quart1yl3gr-2002 doc 4 <br />