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i <br /> 4 ' <br /> Ceolog icat Technics Inc <br /> 1101 7`h Street <br /> Modesto,California 95354 <br /> (209)522-4119/Fax(209)522-4227 <br /> L- t <br /> REPORT <br /> Groundwater Monitoring <br /> to <br /> 4 Quarter 2003 <br /> City of Escalon <br /> Former Arco Gas Mini Mart <br /> 1305 Escalon Ave. <br /> Escalon, CA <br /> Project No. 750.2 <br /> April 12,2004 <br /> r EXECUTIVE SUMMARY <br /> L <br /> This report summarizes the 4`" Quarter 2003 groundwater monitoring and sampling event <br /> ( that took place at the site on December 9, 2003. Sixteen monitoring events have been <br /> L completed to date since the groundwater investigation was initiated in April 2000. <br /> Groundwater samples collected during the December 9, 2003 groundwater-monitoring <br /> event were non-detect for all analyzed constituents, with one exception. <br /> • MW-1 has been non-detect for TPH-G for six consecutive events <br /> L • MW-2, MW-3 and MW-4 have been non-detect for all analyzed constituents since their, <br /> installation in 2000 with the following exception: <br /> o MW-2 showed trace xylenes at detection limits, this analysis is suspect and further <br /> monitoring will provide a clearer picture:! <br /> • MW-5 has been non-detect for all analyzed constituents for eight consecutive events <br /> • The deep well MW-101 was non-detect for the tenth consecutive event <br /> The groundwater gradient for December 9, 2003, is 0.0029 ft/ft flowing N62°W. This is <br /> consistent with past events (see Figure 4). Depth to groundwater at the site was <br /> 4 1 approximately 64.63-feet below ground surface (bgs). The average elevation of <br /> groundwater for the December 2003 monitoring ievent was 55.47 feet above mean sea level. <br /> L• <br />