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1 <br /> V. <br /> Ceotogicat rechnics t". <br /> 41101 7`h Street <br /> Modesto,California 95354 <br /> i (209)522-4119/Fax(209)522-4227 <br /> f <br /> i <br /> 3 <br /> REPORT <br /> L ` <br /> Groundwater"Monitorin <br /> � g <br /> ' 2°d Quarter 2002 <br /> City of Escalon <br /> Former Arco Gas Mini Mart T <br /> 1305 Escalon Ave, <br /> Escalon, CA <br /> ' Project No. 750.2 <br /> August 16, 2002 <br /> r� EXECUTIVE SUMMARY <br /> L.i <br /> This report summarizes the 2"d Quarter 2002 groundwater monitoring and sampling event <br /> that took place at the site on June 28, 2002. Ten monitoring events have been completed to <br /> date since the groundwater investigation was initiated in April 2000. The results of <br /> ranalytical data indicate that detectable concentrations of the aromatic hydrocarbon <br /> L,1 compounds (BTEX) and gasoline" range petroleum hydrocarbons (TPH-G) are present in <br /> one of the 'six monitoring wells. The deep ;well MW-101 was non-detect for the fifth <br /> r consecutive event, strongly suggesting that the contamination previously recorded was a <br /> drilling artifact and not indicative of a deeper contaminant plume. <br /> The groundwater gradient for June 28, 2002, is 0.0019 ft/ft flowing N68°W. This is <br /> consistent with past events see Figure 2 Depth to groundwater at the site was <br /> P ( g ) , p <br /> approximately 62 feet below ground surface(bis) for both events. <br /> A vertical groundwater gradient calculation was made for the June 2002 groundwater- <br /> monitoring event. The vertical gradient was found to be in a downward direction with a <br /> ' slope that is:approximately equal to the water table horizontal gradient. <br /> a <br />