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i <br /> C,e0Cegicat Tec/Mics /Ac. <br /> 1101 7"'Street <br /> Modesto,California 95354 <br /> (209)522-4119/Fax(209)522-4227 <br /> l <br /> r REPORT <br /> I <br /> r <br /> LGroundwater Monitoring <br /> 3rd Quarter 2003 <br /> a ` <br /> i <br /> City of Escalon <br /> Former Arco Gas Mini Mart <br /> a 1305 Escalon Ave. <br /> Escalon, CA <br /> 1 <br /> LProject No. 750.2 <br /> November 18, 2003 <br /> i <br /> i <br /> r EXECUTIVE SUMMARY <br /> This report summarizes the 3rd Quarter 2003 groundwater monitoring and sampling event <br /> that took place at the site on September 6, 2003. Fifteen monitoring events have been <br /> completed to date since the groundwater investigation ,was initiated in April 2000. <br /> Groundwater samples collected during the September 2003 monitoring event were non- <br /> L detect for all analyzed constituents. <br /> • MW-1 has been non-detect for TPH-G for five consecutive events <br /> • MW-2, MW-3 and MW-4 have been non-detect for all analyzed constituents since their <br /> t installation in 2000 <br /> • MW-5 has been non-detect for all analyzed constituents for seven consecutive events <br /> ti • The deep well MW-101 was non-detect for the tenth consecutive event <br /> f - The groundwater gradient for September 6, 2003, is 0.0020 ft/ft flowing N89°W. This is <br /> r consistent with past events (see Figure 4). Depth to groundwater at the site was <br /> approximately 64.5-feet below ground surface (bgs). The average elevation of groundwater <br /> for the September 2003 monitoring event was 55.47 feet above mean sea level. <br /> i <br /> t <br /> a <br />