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C, 06gtcal rechntcs W, <br /> 1101 7"Street <br /> ' Modesto,California 95354 <br /> (209)522-4119/Fax(209)522-4227 <br /> REPORT <br /> Groundwater Monitoring <br /> 2"d Quarter 2002 <br /> ' J.M. Equipment Company <br /> 1245 West Charter Way <br /> Stockton, California <br /> ' Project No 507 2 <br /> October 15, 2002 <br /> EXECUTIVE SUMMARY <br /> This report summarizes the results of the 2°a Quarter 2002 groundwater monitoring and <br /> i sampling event that took place on June 20, 2002 For this event, the average groundwater <br /> elevation at the site was -10 11 feet mean sea level (msl) and the groundwater flow was <br /> N84°E at 0 002 ft/ft Vertical groundwater gradient calculations between MW-9 & 109 <br /> ' show that groundwater is flowing downward at a slope of 0 0039 ft/ft <br /> �,r�rts <br /> The analytical results of groundwater samples show that detectable concentrations of <br /> gasoline range hydrocarbons were present in five 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 four of the wells <br /> 1 <br /> Deep screened well MW-109 was non-detect for all analytes for the first time since it's <br />' installation in May 2001 This suggests that the contamination previously detected was a �- <br /> drilling artifact or the bottom of the groundwater plume Additional monitoring will <br /> confirm this hypothesis <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 />