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40 <br /> 109iCA1 0 c tCS lttc. <br /> 1101 7h Street <br /> Modesto,California 95354 <br /> ' (209)522-4119/Fax(209)522-4227 <br /> REPORT <br /> ' Groundwater Monitoring <br /> 1" Quarter 2005 <br /> J.M. Equipment Company <br /> 1245 West Charter Way <br /> Stockton, California <br /> Project No 507 2 <br /> ' April 18, 2005 <br /> EXECUTIVE SUMMARY <br />' This report summarizes the results of the 0 Quarter 2005 groundwater monitoring and <br /> sampling event that took place on February 17, 2005 For this event, the average <br /> groundwater elevation at the site was —10 14 feet below mean sea level (msl) and the <br />' groundwater flow was N46°E at 0 0033 ft/ft A vertical groundwater gradient calculation for <br /> wells MW-9 & 109 show that groundwater is flowing downward at a slope of 0 0065 ft/ft <br />' The analytical results of groundwater samples show that detectable concentrations of gasoline <br /> range hydrocarbons were present in four of the site's groundwater monitoring wells for this <br /> event Well MW-6 could not be monitored because it was under several inches of storm <br />' water on day of sampling The magnitude of the contamination in the wells is consistent with <br /> historical site data The fuel oxygenate compound MTBE was detected in five monitoring <br /> wells <br /> Moderate to strongly negative Oxidation-Reduction Potent RP <br /> g y ative g Potential (ORP) show that <br /> five of ten 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 />