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i <br /> Ceologica I reChnIcS lac. <br /> 1101 7`h Street <br /> Modesto,California 95354 <br /> (209)522-41191 Fax(209)522-4227 <br /> i.r <br /> REPORT <br /> L; Groundwater Monitoring & Vapor Extraction <br /> 4th Quarter.2004 <br /> City of Escalon <br /> Former Arco Gas Mini Mart <br /> 1305 Escalon Ave. <br /> Escalon, CA <br /> Project No. 750.2 <br /> February 16, 2005 <br /> EXECUTIVE SUMMARY <br /> This report summarizes the &h Quarter 2004 groundwater monitoring work that took place at <br /> The City of Escalon—Former Arco AM-PM (COE) site in November of 2004. <br /> LThe average groundwater elevation decreased by approximately 0.11-feet from the August <br /> 12, 2004 groundwater-monitoring event. Groundwater bearing was westerly with a slope of <br /> 0.0026 ft/ft. Groundwater flow direction,and slope has remained relatively consistent in the <br /> area since April of 2000. <br /> A vertical groundwater gradient calculation was made for the November 26,' 2004 <br /> C, groundwater-monitoring event. The vertical gradient was found to be in a downward <br /> direction with a slope that is less than the water table horizontal gradient. <br /> Oxidation-reduction potential is positive in all monitoring wells. Dissolved oxygen ranges <br /> between 2.5 and 4.5 ppm. The pH at the site ranges between 7.72 and 8.43. These indicators <br /> suggest site conditions are ideal for natural biodegradation. <br /> Laboratory analysis of the groundwater samples, collected during the November 26, 2004, <br /> L groundwater-monitoring event, indicate all the monitoring wells are non-detect above <br /> laboratory reporting limits for all analyzed constituents. <br /> ti <br />