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1 <br /> GeofiogicalTafinics Inc, <br /> 2741 Rtw Road <br /> SWodestn,Calfomta 95351 <br /> (209)538-6424/'FaX#538-5852 <br /> ' REPORT <br /> Groundwater Monitoring <br /> 2nd Quarter 2001 <br /> Marci Property <br /> 2969 Loonus Road <br /> Stockton, CA <br /> Project No 770 2 <br /> August 20, 2001 <br /> EXECUTIVE SUMMARY <br /> ' The site's seven groundwater monitoring wells are monitored and sampled on a quarterly <br /> schedule This report summarizes the 2"d Quarter 2001 round of groundwater monitoring <br /> and testing that took place on June 27, 2001 <br /> ' The analytical results from the wells indicate that detectable concentrations of diesel range <br /> petroleum hydrocarbons are present in five of the seven wells BTEX was detected in four <br /> ' of the groundwater wells <br /> ' Oxidation-Reduction Potential measurements show that four out of the seven monitoring <br /> wells are within the reaction depleted water caused by biodegradation of the contamination <br /> plume <br /> ' The average depth to groundwater at the site was 57 69 feet bgs Groundwater gradient <br /> calculations show that groundwater flow was SWE with a slope of 0 0001 ft/ft Based on a <br /> ' previous consultant's data, this site has a history of variable groundwater flow direction <br /> GTl's computed direction for this fourth consecutive event confirms that groundwater <br /> direction varies fiom quarter to quarter at the site <br /> 1 <br /> z <br />