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INITIAL RELEASE DDJC Tracy <br /> TABLE C-1.Estimated Exposure Doses—Noncancer Effects <br /> Drinking Private Well Water <br /> Estimated Exposure Dose Chronic <br /> m < <br /> -.( ,,day)' <br /> Health Guideline <br /> Maximum Contaminant Oral Basis for Health <br /> Contaminant Concentration(ppb) Adult Child (mg/kg/day) Guideline <br /> TCE 6.7 0.0002 0.0004 not available <br /> Carbon tetrachloride 1.8 0.00005 0.0001 0.0007 12tD <br /> • Estimated Exposure Dose= Conc.x IR x EF x ED <br /> BW xAT <br /> Conc. =Maximum contaminant concentration measured in the private well water(ppm) <br /> IR =Ingestion rate:adult=2 liters per day,child= 1 liter per day <br /> EF =Exposure frequency,or the number of exposure events(7 days x 50 weeks or 350 days per years) <br /> ED =Exposure duration,or the duration over which exposure occurs: adult=30 years;child=6 years <br /> BW =Body weight(kg): adult=70 kg(154 pounds);child= 16 kg(35.2 pounds) <br /> AT =Averaging time,or the period over which cumulative exposures are averaged(6 years or 30 years x 365 days) <br /> Key: ppm=parts per million;mg/kg/day=milligrams contaminant per kilogram body weight per day;RtD=Reference Dose <br /> C-8 <br />