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CeoCo ica� Tecl��tics l`u. <br /> L 1101 street <br /> Modesto,California 95354 <br /> (209)522-4119/Fax(209)522-4227 <br /> REPORT <br /> Groundwater Monitoring & Vapor Extraction <br /> 1St Quarter 2005 <br /> City of Escalon <br /> LFormer Arco Gas Mini Mart <br /> 1305 Escalon Ave. <br /> r Escalon, CA <br /> LProject No. 750.2 <br /> r April 1, 2005 <br /> L <br /> EXECUTIVE SUMMARY <br /> This report summarizes the 1" Quarter 2005 groundwater monitoring work that took place at <br /> The City of Escalon — Former Arco AM-PM (COE) site on February 16, 2005. This report <br /> also summarizes the remedial effectiveness of the soil vapor extraction system (SVE), which <br /> has been in operation since late September of 2004. <br /> The average groundwater elevation increased by approximately 0.98-feet from the November <br /> 26, 2004 groundwater-monitoring event. Groundwater bearing was westerly with a slope of <br /> 0.0018 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 February 16, 2005 <br /> groundwater-monitoring event. The vertical gradient was found to be in a downward <br /> f direction with a slope that is less than the water table horizontal gradient. <br /> L <br /> Oxidation-reduction potential is positive in all monitoring wells. Dissolved oxygen ranges <br /> L between 3.5 and 4.1 ppm. The pH at the site ranges between 6.90 and 7.14. These indicators <br /> suggest site conditions are ideal for natural biodegradation. <br /> i <br /> �i <br />