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INITIAL RELEASE DDJC Tracy <br /> TABLE C-3.Estimated Exposure Doses—Noncancer Effects <br /> Incidental Ingestion of Day Care Center Play Yard Surface Soil <br /> )?stimated Dose Health Guideline <br /> Maximum Contaminant Child Oral Basis for Health <br /> Contaminant Concentration m m /d6m da Guideline <br /> Arsenic 4.03 0.00004 0.0003 MRL • <br /> Chromium 28.6 0.0003 0.005 RID <br /> Vanadium 33 0.0003 0.003 MRL <br /> DDT 3.31 0.00002 0.0005 MRL <br /> DDE 2.35 0.00003 0.0005 MRL(DDT) <br /> Dieldrin 0.357 0.000003 0.00005 MRL/RfD <br /> Estimated Exposure Dose=Cone. x IR x CF x EF x ED <br /> BW xAT <br /> Conc. =Maximum contaminant concentration measured in the Day Care Center play yard soil(ppm) <br /> IR = Soil Ingestion rate for a child: 200 mg/day. <br /> CF = Conversion factor: 10' <br /> EF =Exposure frequency,or the number of exposure events(5 days x 50 weeks or 250 days per year) <br /> ED =Exposure duration,or the duration over which exposure occurs: child=6 years <br /> BW =Body weight(kg):child= 16 kg(35.2 pounds) <br /> AT =Averaging time,or the period over which cumulative exposures are averaged(6 years x 365 days) <br /> Key: ppm=parts per million;mg/kg/day=milligrams contaminant per kilogram body weight per day,MRL=Minimal Risk Level;RfD=EPA's Reference Dose. <br /> C-10 <br />