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1 <br /> Ceologic, t re ch da Inc. <br /> l 101 71'Street <br /> Modesto,California 95354 <br /> (209)522-4119/Fax(209)522-4227 <br /> ' REPORT <br /> Groundwater Monitoring <br /> ' 4t" Quarter 2003 <br /> J.M. Equipment Company <br /> 1245 West Charter Way <br /> Stockton, California <br /> ' <br /> Project No 507 2 <br /> Apnl 12, 2004 <br /> r <br /> EXECUTIVE SUMMARY <br /> This report summarizes the results of the 4`h Quarter 2003 groundwater monitoring and <br /> ' sampling event that took place on December 12, 2003 For this event, the average <br /> groundwater elevation at the site was —12 26 feet mean sea level (msl) and the groundwater <br /> flow was N41°E at 0 002 ft/ft A vertical groundwater gradient calculation for wells MW-9 <br /> ' & 109 show that groundwater is flowing downward at a slope of 0 004 ft/ft <br /> The analytical results of groundwater samples show that detectable concentrations of <br /> gasoline range hydrocarbons were present in six 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 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 injection pilot test The SJC EHD issued approval of the work plan in <br /> their September 10, 2003 letter The first phase of the work has been completed with the <br /> ' installation of three 3/4" monitoring wells on February 5, 2004 and the injection process <br /> began in mid March 2004 <br /> r <br /> r <br />