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1 <br /> Geologicat Tecliics taC. <br />' 2741 River Road <br /> Modesto Califomia 95351 <br /> (209)538-6424/Fax#1538-5852 <br />' REPORT <br />' Groundwater Monitoring <br /> 3rd Quarter 2001 <br />' J.M. Equipment Company <br /> 1245 West Charter Way <br /> Stockton, California <br /> Project No 507 2 <br />' November 6, 2001 <br /> EXECUTIVE SUMMARY <br />' This report summarizes the results of the 3' Quarter 2001 groundwater monitoring and <br /> testing event that took place on September 17, 2001 For this event, the average <br />' groundwater elevation at the site was —9 62 feet mean sea level (msl) and the groundwater <br /> flow was N72°E at 0 002 ft/ft Vertical groundwater gradient calculations between MW-9 <br /> & 109 show that groundwater is flowing downward at approximately two times horizontal <br />' gradient <br /> The analytical results of groundwater samples show that detectable concentrations of BTEX <br /> and TPH-G were present in seven of eleven groundwater monitoring wells The magnitude <br /> of the contamination in the wells is consistent with historical site data The fuel oxygenate <br />' compound MTBE was detected in one of the wells <br /> The Oxidation-Reduction Potential measurements show that ten of eleven of the monitoring <br /> wells are within the halo of reaction depleted water caused by biodegradation of the <br /> contamination plume <br />