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INITIAL RELEASE DDJC Tracy <br /> TABLE 3.Contaminant Concentrations in DDJC Tracy Water Supply' <br /> Concentration(ppbj Number of betecfions <br /> Number ofDetections/ Greater than the Comparison Value <br /> Contaminant Minimum Maximum Number of Sam les Com`atison Value ` b <br /> TCG ND ND 0/3 0 3 CREG <br /> 5 CA&EPA MCL <br /> PCE ND ND 0/3 0 0.7 CREG <br /> 5 CA&EPA MCL <br /> Carbon Tetrachloride ND ND 0/3 0 0.3 CREG <br /> 5 CA&EPA MCL <br /> Pesticides ND ND 0/20 0 various <br /> Arsenic 3 10 3/28 3/3 0.02 CREG <br /> 50 CA&EPA MCL <br /> Lead 3 5 2/29 0/2 IS EPA action level <br /> Manganese 20 180 16/28 9/16 50 EPA secondary MCL <br /> 50/200 RMEG <br /> Mercury 1 5 2/29 0/2 2 CA&EPA MCL • <br /> Source:Woodward-Clyde Consultants, 19926;DDJC Tracy, 1998 <br /> ' WSW 4 metal and pesticide sampling results from 1988, 1990,and 1994;WSW 7 VOC sampling results from 1988 through 1991 and metal and pesticide results from 1988 through <br /> 1997;WS Ws 8 and 9 metal and pesticide sampling results from 1994 through 1997.For one sample,detection limits for arsenic and lead exceeded the comparison values. <br /> 'The concentration was compared to the CREG or lowest comparison value. <br /> 'Pesticides include endrin,lindane,methoxychlor,toxaphene,chlordane,heptachlor,heptachlor epoxide,2,4-dichlorophenoxy acetic acid,and Silex. <br /> Key: CREG-Cancer Risk Evaluation Guide for 1 x 10"excess cancer risk.;EMEG=Environmental Media Evaluation Guide;RMEG a Reference Dose Media Evaluation Guide; <br /> MCL- Maximum Contaminant Level. <br /> 34 <br />