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CTe0logica l ToChAics 1/t C* <br /> ' 1101 71h street <br /> Modesto,Cahfornta 95354 <br /> (209)522.4119/Fax(209)522-4227 <br /> ' REPORT <br /> Groundwater Monitoring <br />' 2nd Quarter 2004 <br />' J.M. Equipment Company <br /> 1245 West Charter Way <br /> Stockton, California <br /> Project No 507 2 <br />' August 30, 2004 <br /> EXECUTIVE SUMMARY <br /> This report summarizes the results of the Zed Quarter 2004 groundwater monitoring and <br /> sampling event that took place on June 4, 2004 For this event, the average groundwater <br /> elevation at the site was —10 98 feet mean sea level (msl) and the groundwater flow was <br /> N550E at 0 004 ft/ft A vertical groundwater gradient calculation for wells MW-9 & 109 <br /> show that groundwater is flowing downward at a slope of 0 003 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 six of the wells <br /> The Oxidation-Reduction Potential measurements show that all eleven of the monitoring <br /> wells are within the halo of reaction depleted water caused by biodegradation of the <br /> contamination plume <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 infection well MW-9 <br /> have decreased by half A report on the pilot test is under development and 11 will contain <br /> recommendation for additional remedial actions <br /> 1 <br />