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h <br /> i <br /> t 5 <br /> CCe0togieat reCIM 4CS /a. <br /> 1 101 7`h Strcet <br /> Modesto,Califomia 95354 <br /> (209)522-4119/Fax#522-4227 <br /> { <br /> I 1 <br /> REPORT <br /> Groundwater Monitoring <br /> 0' Quarter 2003 <br /> t <br /> Cardoza <br /> Super Stop Market <br /> 290 N. Main St. <br /> Manteca, CA <br /> } 4 <br /> Project No. 662.2 <br /> January 27, 2004 <br /> EXECUTIVE SUMMARY <br /> This report summarizes the 4"' Quarter 2003 groundwater monitoring event that took place yy <br /> on November 21, 2003. The laboratory analyses reveal that low to moderate concentrations h <br /> of the oxygenated fuel compound MTBE was detected in three of the site's four welts. <br /> BTEX and TPH-G were not detected in any of the groundwater samples. This data is <br /> consistent with past events. ; <br /> In accordance with San Count Joaquindirectives, <br /> q y the groundwater samples were also <br /> .analyzed for diesel, methanol, ethanol, ETBE, DIPE, TAME, TBA, 1,2-DCA, EBD and <br /> lead. The samples did not contain any of these constituents above the laboratory.reporting <br /> limits. i <br /> An additional deep well was installed at the site on May 30, 2002. Well MW-104 was <br /> laced on the eastern edge of the <br /> . p g former UST excavation. This well contained MTBE (2.$ <br /> ug/I) for the sixth consecutive event. <br /> I <br /> The average elevation of groundwater at the site was 10.21 feet mean sea level, or <br /> approximately 29 feet below grade. Groundwater .gradient calculations show that <br /> groundwater flow was S75°E with a slope of 0.0013 ft/ft. The predominant groundwater <br /> (� direction has been to the east-northeast during the investigation. I <br />