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INITIAL RELEASE DDJC Tracy <br /> TABLE 4.Contaminant Concentrations in Of-Site Private Wells(Domestic Use)' <br /> Concentration(ppb) Number of Detections <br /> Number of Detections/ Greater than the Comparison <br /> Contaminant Minimum Maximum Number of Samples Comparison Value' Value(ppb) <br /> TCE 3.4 6.7 3/18 3 3 CREG . <br /> 5 CA&EPA MCL <br /> PCE ND ND 0/I8 0 0.7 CREG <br /> 5 CA&EPA MCL <br /> Carbon tetrachloride 0.6 1.8 6/18 6 0.3 CREG <br /> 5 CA&EPA MCL <br /> Source: Woodward-Clyde Consultants, 1992b. <br /> 'Results from 1987 and 1991 private well monitoring. <br /> 'The concentration was compared to the CREG or lowest comparison value. <br /> Key: ND=not detected;CREG=Cancer Risk Evaluation Guide for 1 x 104 excess cancer risk;MCL=Maximum Contaminant Level. <br /> • <br /> 35 <br />