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INITIAL RELEASE DDJC Tracy <br /> TABLE C-2.Estimated Exposure Doses—Cancer Effects <br /> Drinking Private Well Water <br /> Maximum Contem Want Estimated Exposure pose-Cancer Cancer Potency Factor Lifetime Cancer Risk" <br /> Contaminant Concentration( b (mg/kg/day)* <br /> TCE 6.7 0.00008 0.011' 9 x 10' <br /> Carbon Tetrachloride 1.8 0.00002 0.13 3 x 10 <br /> 'Estimated Exposure Dose-Cancer = Conc. x CF x IR x EF x ED <br /> BW xAT <br /> Conc. =Maximum contaminant concentration measured in the private well water(ppb) <br /> CF =Conversion factor: 10"' <br /> IR =Ingestion rate: 2 liters per day <br /> EF =Exposure frequency,or the number of exposure events(1 event x 7 days x 50 weeks or 350 days per year) <br /> ED =Exposure duration,or the duration over which exposure occurs=30 years <br /> BW =Body weight(kg):70 kg(154 pounds) <br /> AT =Average time or the time over which cumulative exposures are averaged(70 years x 365 days) <br /> 'Lifetime Cancer Risk=Estimated Exposure Dose(Cancer)x Cancer Potency Factor <br /> 'EPA is currently reviewing the CPP for TCE.ATSDR uses the previously derived CPF for screening purposes. <br /> Key: ppm=parts per million;mg/kg/day=milligrams contaminant per kilogram body weight per day <br /> • C-9 <br />