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qedogicat Tec%ccs `at <br /> 110171h street <br /> Modesto,California 95354 <br /> (209)522-4119/Fax(209)522-4227 <br /> REPORT <br /> Groundwater Monitoring <br /> 2nd Quarter 2004 <br /> City of Escalon <br /> Former Arco Gas Mini Mart <br /> L1305 Escalon Ave.Escalon, CA <br /> 1^ Project No. 750.2 <br /> L August 30, 2004 <br /> EXECUTIVE SUMMARY <br /> This report summarizes the 2nd Quarter 2004 groundwater monitoring and sampling event <br /> that took place at the site on May 7, 2004. Groundwater samples collected from MW-4 <br /> r showed trace levels of some BTEX constituents. <br /> L The groundwater gradient for the 2nd Quarter 2004, is 0.0028 ft/ft flowing N83°W. This is <br /> consistent with past events (see Figure 4). Depth to groundwater at the site was <br /> approximately 64.21-feet below ground surface (bgs). The average elevation of groundwater <br /> for the May 7, 2004, groundwater-monitoring event was 55.94 feet above mean sea level. <br /> LM 2004 groundwater- <br /> monitoring <br /> vertical groundwater gradient calculation was made for the May g <br /> monitoring event. The vertical gradient was found to be in a downward direction with a <br /> slope that is less thanthe water table horizontal gradient. <br /> Oxidation-reduction potential is positive in all monitoring wells. Dissolved oxygen ranges <br /> between 4.3 and 7.3 ppm. The pH at the site ranges between 7.1 and. 7.3. All these <br /> indicators suggest the site is ideal for natural biodegradation. <br /> r <br /> r � <br /> L` <br />