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1 ' <br /> { Geological 7CCtai <br /> cs !`tc. <br /> f 2741 River Road <br /> ' Modesto,California 95351 <br /> (209)538-6424/Fax#538-5852 <br /> I <br /> REPORT <br /> Groundwater Monitoring <br /> 3 d Quarter 2001 <br /> r <br /> City of Escalon <br /> Former Arco Gas Mini Mart <br /> 1305 Escalon Ave. <br /> Escalon, CA <br /> Project No. 750.2 <br /> October 4, 2001 <br /> + EXECUTIVE <br /> SUMMARY <br /> This report summarizes the 3" Quarter 2001 groundwater monitoring and testing event that <br /> took place at the site on August 15, 2001. Eight events have been completed to date since <br /> the groundwater investigation was initiated in April 2000. The results of analytical data <br /> indicate that detectable concentrations of the aromatic compounds hydrocarbon corn BTEX and <br /> Y p ( ) <br /> total petroleum hydrocarbons (TPH-G) are present in one of the six monitoring wells. The <br /> deep well MW-101 was non-detect for the second consecutive event and this suggests that <br /> the contamination previously recorded was a drilling artifact and not indicative of a deeper <br /> contaminant plume. <br /> The groundwater gradient is 0.001 ft/ft flowing N77°W which is consistent with past events <br /> (see Figures 2 & 3). Depth to groundwater at the site was approximately 63 feet below <br /> ground surface (bgs). <br /> A vertical groundwater gradient calculation was made for the groundwater monitoring <br /> event. The vertical gradient was found to be in a downward direction with a slope that is <br /> ' approximately one order of magnitude greater than the water table horizontal gradient. This <br /> is consistent with past events. <br /> r <br />