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1 <br /> i' Geological Technics Inc. <br />' 1101 7h street <br /> Modesto,Caltforma 95354 <br /> (209)522-4119/Fax(209)522-4227 <br /> REPORT <br />' Groundwater Monitoring <br /> 2nd Quarter 2005 <br />' J.M. Equipment Company <br /> 1245 West Charter Way <br />' Stockton, California <br /> Project No 507 2 <br />' June 30, 2005 <br /> EXECUTIVE SUMMARY <br /> This report summarizes the results of the 2nd Quarter 2005 groundwater monitoring and <br /> sampling event that took place on May 27, 2005 For this event, the average groundwater <br /> elevation at the site was —8 92 feet below mean sea level (msl) and the groundwater flow was <br />' N84°E at 0 002 ft/ft A vertical groundwater gradient calculation for wells MW-9 & 109 <br /> show that groundwater is flowing downward at a slope of 0 0038 ft/ft <br />' The analytical results of groundwater samples show that detectable concentrations of gasoline <br /> range hydrocarbons were present in five of the site's groundwater monitoring wells for this <br /> event The magnitude of the contamination in the wells is consistent with historical site data <br />' The fuel oxygenate compound MTBE was detected in five monitoring wells <br /> Moderate to strong negative Oxidation-Reduction Potential (ORP) measurements show that <br />' eight monitoring wells are within the halo of reaction depleted water caused by <br /> biodegradation of the 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 a report <br />' on the pilot test was submitted to SJC EHD for review in November 2004 They have since <br /> commented on the field work and requested that a site conceptual model (SCM) be submitted <br /> prior to proposing further corrective action <br /> 1 <br />