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16 <br /> Ceotogicat 7-echtaa lac. <br />' 1 101 7'h Street <br /> Modesto,California 95354 <br /> (209)522-4119/Fac(209)5224227 <br /> 1 <br /> REPORT <br /> 1 <br /> Groundwater Monitoring <br />' 1st Quarter 2002 <br /> J.M. Equipment Company <br /> 1245 West Charter Way <br /> Stockton, California <br /> 1 Project No 507 2 <br /> June 17, 2002 <br /> EXECUTIVE SUMMARY <br /> This report summarizes the results of the 1st Quarter 2002 groundwater monitoring and <br />' sampling event that took place on February 26, 2002 This is the fourth consecutive event <br /> completed since three additional groundwater wells were installed on May 24, 2001 For <br /> this event, the average groundwater elevation at the site was —9 35 feet mean sea level (msl) <br />' and the groundwater flow was N7$°E at 0 002 ft/ft Vertical groundwater gradient <br /> calculations between MW-9 & 109 show that groundwater as flowing downward at a slope <br /> approximately equal to the horizontal gradient <br />' The analytical results of groundwater samples show that detectable concentrations ons of <br />' gasoline range hydrocarbons were present in eight of the site's eleven groundwater <br /> monitoring wells The magnitude of the contamination an the wells is consistent with <br /> historical site data The fuel oxygenate compound MTBE was detected in four of the wells _ <br /> The fuel additive Ethanol was also detected an two 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 />