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Cealogical recti Inco <br /> ' 1101 7`h Street <br /> Modesto,California 95354 <br /> (209)522-4119/Fax(209)522-4227 <br /> ' REPORT <br /> Groundwater Monitoring <br /> ' Td Quarter 2004 <br /> ' J.M. Equipment Company <br /> 1245 West Charter Way <br /> ' Stockton, California <br /> Project No 507 2 <br /> ' November 11, 2004 <br /> EXECUTIVE SUMMARY <br /> This report summarizes the results of the 3`d Quarter 2004 groundwater monitoring and <br /> ' sampling event that took place on August 25, 2004 For this event, the average groundwater <br /> elevation at the site was —12 44 feet below mean sea level (msl) and the groundwater flow <br /> was N72°E at 0 0042 ft/ft A vertical groundwater gradient calculation for wells MW-9 & <br /> ' 109 show that groundwater is flowing downward at a slope of 0 0056 ft/ft <br /> ' The analytical results of groundwater samples show that detectable concentrations of gasoline <br /> range hydrocarbons were present in six of the site's eleven groundwater monitoring wells <br /> The magnitude of the contamination in the wells is consistent with historical site data The <br />' fuel oxygenate compound MTBE was detected in five monitoring wells <br /> The Oxidation-Reduction Potential (ORP) measurements show that all the eleven monitoring <br />' wells are within the halo of reaction depleted water caused by biodegradation of the <br /> contamination plume The ORP values are slightly more positive for wells MW-7, MW-8 & <br /> MW-10 <br />' GTI submitted our June 10, 2003 "In-Situ Remediation Pilot Test" work plan for an in-situ <br /> hydrogen peroxide infection pilot test The SJC EHD issued approval of the work plan in <br />' their September 10, 2003 letter The infection process began on March 19, 2004 and the <br /> initial laboratory data indicate that the contaminant concentrations in injection well MW-9 <br /> 1 <br />