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1 <br /> CTQAtog I Cat Technwo S 1/t C. <br /> ' 1 101 Th Street <br /> Modesto,California 95354 <br /> ' (209)522-4119/Fax(209)522-4227 <br /> REPORT <br /> ' Groundwater Monitoring <br /> 3`d Quarter 2002 <br /> J.M. Equipment Company <br /> 1245 West Charter Way <br /> Stockton, California <br /> Project No 507 2 <br /> ' January 17, 2003 <br /> MEXECUTIVE SUMMARY <br /> This report summarizes the results of the 3`d Quarter 2002 groundwater monitoring and <br /> sampling event that took place on September 16, 2002 For this event, the average <br /> groundwater elevation at the site was—11 74 feet mean sea level (msl) and the groundwater <br /> ' flow was N60°E at 0 003 ft/ft A vertical groundwater gradient calculation for wells MW-9 <br /> & 109 show that groundwater is flowing downward at a slope of 0 0045 ft/ft <br /> ' The analytical results of groundwater samples show that detectable concentrations of <br /> gasoline range hydrocarbons were present in seven of the site's eleven groundwater <br /> ' monitoring wells The magnitude of the contamination in the wells is consistent with <br /> historical site data The fuel oxygenate compound MTBE was detected in six of the wells <br /> ' The Oxidation-Reduction Potential measurements show that ten of the monitoring wells are <br /> within the halo of reaction depleted water caused by biodegradation of the contamination <br /> plume <br />