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Ceolo icaI Tecka`cs lace <br /> 1101 7t°Street <br /> Modesto,California 95354 <br /> (209)522-4119/Fax(209)522-4227 <br /> .REPORT <br /> Groundwater Monitoring <br /> 3rd Quarter 2004 <br /> City of Escalon <br /> Former Arco Gas Mini Mart <br /> 1305 Escalon Ave. <br /> Escalon, CA <br /> r . <br /> L Project No. 750.2 <br /> November 10, 2004 <br /> EXECUTIVE SUMMARY <br /> This report summarizes the 3rd Quarter 2004 groundwater monitoring work that took place at <br /> C The City of Escalon—Former Arco AM-PM (COE) site in August of 2004. <br /> L <br /> The average groundwater elevation decreased by approximately 1.75-feet from the May 7, <br /> Cr 2004 groundwater-monitoring event. Groundwater bearing was westerly with a slope of <br /> 0.0022 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 August 12, 2004 groundwater- <br /> monitoring event. The vertical gradient was found to be in a downward direction with a <br /> 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 2.4 and 5.0 ppm. The pH at the site ranges between 6.97 and 7.17. ORP is positive <br /> in all monitoring wells. These indicators suggest site conditions are ideal for natural <br /> biodegradation. <br /> Laboratory analysis of the groundwater samples, collected during the August 12, 2004, <br /> ' groundwater-monitoring event, indicate all the monitoring wells are non-detect above <br /> laboratory reporting limits for all analyzed constituents. <br />