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Geotogical recce Inc. <br /> ' 1101 7"Street <br /> Modesto,Calhforrim 95354 <br /> (209)522-4119/Fax(209)522-4227 <br /> REPORT <br /> Groundwater Monitoring <br /> 1" Quarter 2003 <br />' J.M. Equipment Company <br /> 1245 West Charter Way <br /> ' Stockton, California <br /> Project No 507 2 <br /> May 15, 2003 <br /> EXECUTIVE SUMMARY <br />' This report summarizes the results of the 1 S' Quarter 2003 groundwater monitoring and <br /> sampling event that took place on March 18, 2003 For this event, the average groundwater <br /> elevation at the site was —10 30 feet mean sea level (msl) and the groundwater flow was <br />' N700E 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 0012 ft/ft <br />' The analytical results of groundwater samples show that detectable concentrations of <br /> gasoline range hydrocarbons were present in seven 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 five of the wells <br /> The Oxidation-Reduction Potential measurements show that nine of the monitoring wells <br /> are within the halo of reaction depleted water caused by biodegradation of the <br /> contamination plume <br /> 1 <br />