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eoCo ical rechii cs Inc. <br /> 2741 River Road <br /> Modesto,California 95351 <br /> (209)538-6424/Fax#538-5852 <br /> REPORT <br /> i Groundwater Monitoring <br /> 4" Quarter 2001 <br /> Marci Property <br /> 2969 Loomis Road <br /> Stockton, CA <br /> Project No. 770.2 <br /> January 10, 2002 <br /> i <br /> EXECUTIVE SUMMARY <br /> The site's seven groundwater monitoring wells are sounded and sampled on a quarterly <br /> schedule. This report summarizes the 4"' Quarter 2001 round of groundwater monitoring <br /> and testing that took place on December 7, 2001. <br /> F <br /> The analytical results from the wells indicate that detectable concentrations of diesel range <br /> I petroleum hydrocarbons are present in four of the site's seven wells. Well MW-5 contained <br /> 9,550 µg11 TPH-D and this is the highest level detected since the well's installation in <br /> August 2000. <br /> Oxidation-Reduction Potential measurements show that all seven monitoring wells are <br /> within the reaction depleted water caused by biodegradation of the contamination plume. <br /> Groundwater gradient calculations show that groundwater flow was N70°E with a slope of <br /> i 0.0004 ft/ft. Based on a previous consultant's data, this site has a history of variable <br /> { groundwater flow direction. GTI's computed direction for this sixth consecutive event <br /> confirms that groundwater direction varies from quarter to quarter at the site. <br />