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1. <br /> trrs� a <br /> :i <br /> S. <br /> s <br /> Ceoto icat Technics Inc. <br /> L1101 711 Street <br /> Modesto,California 95354 <br /> (209)522-4119/Fax(209)522-4227 <br /> L <br /> L <br /> REPORT <br /> Groundwater Monitoring <br /> 1St Quarter 2004 <br /> LCity of Escalon <br /> Former Arco Gas Mini Mart <br /> 1305 Escalon Ave. <br /> L Escalon, CA <br /> Project No. 750.2 <br /> L <br /> May 13 2004 <br /> EXECUTIVE SUMMARY <br /> L <br /> This report summarizes the 1" Quarter 2004 groundwater monitoring and sampling event <br /> that took place at the site on March 13, 2004. Groundwater samples collected during the <br /> L March 2004 groundwater-monitoring event were non-detect for all analyzed constituents. <br /> The groundwater gradient for the I" Quarter 2004, is 0.0029 ft/ft flowing N74°W. This is <br /> L consistent with past events (see Figure 4). Depth to groundwater af the site was <br /> approximately 63.64-feet below ground surface. (bgs). The average elevation of <br /> L groundwater for the March 13, 2004, groundwater-monitoring event was 56.46 feet above <br /> mean sea level. <br /> LA vertical groundwater gradient calculation was made for the March 2.004 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 /> L <br /> Oxidation-reduction potential is positive in all monitoring wells. Dissolved oxygen ranges <br /> between 3.8 and 6.4 ppm. The pH at the site ranges between 7.1 and 7.5. All these <br /> indicators suggest the site is ideal for natural biodegradation. <br /> L <br /> L <br />