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# � 1 <br /> I <br /> I y I <br /> Ceolbeccat rech&ia inc. <br /> 2741 River Road <br /> Modesto,California 95351 <br /> J <br /> (209)538-6424&ax#538-5852 <br /> REPORT <br /> Groundwater Monitoring <br /> � g <br /> 4`h Quarter 2001 <br /> City of Escalon <br /> Former Arco Gas Mini Mart <br /> 1305 Escalon Ave. <br /> Escalon, CA <br /> Project No. 750.2 <br /> December 20, 2001 <br /> EXECUTIVE SUMMARY <br /> I <br /> This report summarizes the 4'h Quarter 2001 groundwater monitoring and sampling event <br /> that took place at the site on November 16, 2001. Nine monitoring events have been <br /> completed to date since the groundwater investigation was initiated in April 2000. The <br /> results of analytical data indicate that detectable concentrations of the aromatic hydrocarbon <br /> compounds (BTEX) and total petroleum hydrocarbons (TPH-G) are present in one of the six <br /> monitoring wells. Low levels of MTBE were present in MW-1 and MW-5. The deep well <br /> MW-101 was non-detect for the third consecutive event and this suggests that the <br /> contamination previously recorded was a drilling artifact and not indicative of a deeper <br /> contaminant plume. ; <br /> II � <br /> The groundwater gradient is 0.0021 ft/ft flowing N87o W which is consistent with past <br /> events (see Figures 2 & 3). Depth to groundwater at the site was approximately 63 feet <br /> l <br /> below 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 two times greater than the water table horizontal gradient. This is consistent <br /> 1 with past events. <br /> f <br /> f <br />