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SV& t <br /> 0 A S S O C I A T E S I N C <br /> gradient on March 28, 2002 was calculated to be 0 007 ft/ft or approximately 35 ft/mile A <br /> summary of groundwater monitoring data is presented in Table 1 <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 )increased since December 2001 <br /> RECOMMENDATIONS <br /> Based on the results of the First Quarter 2002 monitoring episode, we recommend the following <br /> • Conduct the Second Quarter 2002 groundwater monitoring and sampling of wells MW 1 <br /> through MW10 and CW and analyze samples for TPHg and BTEX by EPA methods <br /> 8015/8020 and MTBE, ETBE, TBA, TAME, and DIPE by EPA method 8260 <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 /> 1), J." <br /> Drew Van Allen <br /> Project Manager �f <br /> eanne Homsey, P Ea <br /> CA Registered Civil Engineer No 47410 �#° ~�p Z�0-3� <br /> cc Mr and Mrs Raymond Farmer 's-" <br /> • Marty Hartzell, RWQCB <br /> w lwordpro1625961quart1yllgr-2002 doe 4 <br />