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1 <br /> Ce0logic, rec%tics Inn. <br /> ' 1 101 7'h Strect <br /> Modesto,California 95354 <br /> ' (209)522-4119/Fax 4 5224227 <br /> ' REPORT <br /> ' Groundwater Monitoring <br /> 4"' Quarter 2002 <br /> ' Cardoza <br /> Super Stop Market <br /> ' 290 N Main St <br /> Manteca, CA <br /> ' Project No 662 2 <br /> May 5, 2003 <br /> EXECUTIVE SUMMARY <br /> This report summarizes the 15' Quarter 2003 groundwater monitoring event that took place <br /> on February 13, 2003 The test results show that low to moderate concentrations of the <br /> ' oxygenated fuel compound MTBE was detected in three of the site's four wells BTEX and <br /> TPH-G were not detected to any of the groundwater samples This data is consistent with <br /> ' 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 contained MTBE (29 <br /> ug/l) for the third consecutive event <br /> ' The average elevation of groundwater at the site was 16 33 feet mean sea level, or <br /> approximately 23 feet below grade Groundwater gradient calculations show that <br /> groundwater flow was to the N57°E with a slope of 0 0013 ft/ft The predominant <br /> ' groundwater direction has been to the east-northeast during the investigation <br /> 1 <br />