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Ceota ical rec%ics 1"0 <br /> 1101 7"Street <br /> Modesto,California 95354 <br /> (209)522-4119/Fax 4 522-4227 <br /> �I <br /> REPORT <br /> Groundwater Monitoring <br /> � th <br /> 4 Quarter 2002 <br /> Cardoza <br /> Super Stop Market <br /> 290 N. Main St. <br /> Manteca, CA <br /> Project No. 662.2 <br /> March 31, 2003 <br /> EXECUTIVE SUMMARY <br /> This report summarizes the 4`h <br /> p Quarter 2002 groundwater monitoring event that took place <br /> on December 13, 2002. The test results show that low to moderate concentrations of the <br /> oxygenated fuel compounds (MTBE, TAME & ETBE) were detected in three of the site's <br /> four wells. BTEX and TPH-G were not detected in any of the groundwater samples. This <br /> data is consistent with past events. <br /> An additional deep well was installed at the site on May 30, 2002. Well.MW-104 was <br /> placed on the eastern edge of the former UST excavation. This well was sampled for the <br /> second consecutive event and contained 66 ug/1 MTBE. <br /> The average elevation of groundwater at the site was 14.50 feet mean sea level, or <br /> approximately 25 feet below grade. Groundwater gradient calculations show that ' <br /> 1 <br /> groundwater flow was to the N77°E with a slope of 0.0008 ft/ft. The predominant <br /> groundwater direction has been to the east-northeast during the investigation. <br /> �1 <br /> L-' <br />