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{ <br /> Geologicaf Tecfmws -I=. <br /> 2741 River Wpad <br /> Jlodesta,CaCifartua 95351 <br /> (209)538-64241TxC#538-5852 <br /> C <br /> fir <br /> i <br /> REPORT <br /> Groundwater Monitoring <br /> E L 2"d Quarter 2001 <br /> City of Escalon <br /> Former Arco Gas Mini Mart <br /> 1350 Escalon Ave. <br /> Escalon, CA <br /> Project No. 750.2 <br /> EXECUTIVE SUMMARY <br /> i <br /> This report summarizes the 2" Quarter 2001 groundwater monitoring and testing event that <br /> took place at the site on May 15, 2001. This was the sixth consecutive quarterly <br /> groundwater monitoring event. The results of analytical data indicate that detectable <br /> w <br /> concentrations of the aromatic hydrocarbon compounds (BTEX) and total petroleum <br /> hydrocarbons (TPH-G) are present in two of the six monitoring wells. The BTEX <br /> concentrations in well MW-1 have fallen to non-detect levels for the first time in the <br /> investigation. The deep well MW-101 is now non-detect as well and this suggests that the <br /> _ contamination previously recorded was a drilling artifact and not indicative of a deeper <br /> contaminant plume. <br /> The groundwater gradient is 0.0024 ft/ft flowing N78°W which is consistent with past <br /> events (see Figures 2 & 3). Depth to groundwater at the site was approximately 61 feet <br /> below ground surface(bgs). <br /> A vertical groundwater gradient calculation was made for the groundwater monitoring event <br /> and found to be in a downward direction with a slope that is approximately four times <br /> greater in magnitude then the water table horizontal gradient. <br /> � L <br /> f <br />