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�e0`0gicaC TeChg CS Inc. <br /> 2741 River Road <br /> Modesto,California 95351 <br /> ' (209)538-6424/Fax#538-5852 <br /> REPORT <br /> Groundwater Monitoring <br /> 4th Quarter 2001 <br /> J.M. Equipment Com an <br /> Company <br /> 1245 West Charter Way <br /> Stockton, Cahfornia <br /> Project No 507 2 <br /> January 17, 2002 <br /> EXECUTIVE SUMMARY <br /> This report summarizes the results of the 4`h Quarter 2001 groundwater monitoring and <br /> sampling event that took place on December 4, 2001 For this event, the average <br />' groundwater elevation at the site was —8 38 feet mean sea level (msl) and the groundwater <br /> flow was N4°W at 0 001 ft/ft However, groundwater does flow towards the east in the <br /> eastern portion of the site Vertical groundwater gradient calculations between MW-9 & <br /> 109 show that groundwater is flowing downward at approximately seven times horizontal <br /> gradient Well MW-6 was not sounded or sampled due to several inches of rainwater that <br /> had ponded in the area around the well <br /> 1 The analytical results of groundwater samples show that detectable concentrations of BTEX <br /> and TPH-G were present in five of the site's eleven groundwater monitoring wells The <br /> magnitude of the contamination in the wells is consistent with historical site data The fuel <br /> oxygenate compound MTBE was detected in two of the wells The fuel additive Ethanol <br /> was also detected In two of the wells <br /> Thexi <br /> O dation-Reduction Potential measurements show that nine of eleven of the <br /> 1 monitoring wells are within the halo of reaction depleted water caused by biodegradation of <br /> the contamination plume <br />