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Table 4: Default Exposure Parameters (continued) <br />Parameter Variable <br />Name Units Value Reference <br />Averaging time for carcinogens A Tca rC days 365 x 70 <br />70 years by definition <br />(USEPA 1989) <br />Averaging time for noncarcinogens AT, days 365 x ED USEPA 1989 <br />Body weight, residential child BWc kg 15 DTSC HERO (2011) <br />Body weight, residential adult BW„ kg 70 DTSC HERO (2011) <br />Body weight, commercial/industrial BW0 kg 70 DTSC HERO (2011) <br />Body weight, utility worker BW,, kg 70 DISC HERO (2011) <br />Exposure duration, residential child ED. years 6 DTSC HERO (2011) <br />Exposure duration, residential adult ED, years 24 DTSC HERO (2011) <br />Exposure duration, commercial/industrial ED,, years 25 DTSC HERO (2011) <br />Exposure duration, utility worker EDat years 1 DTSC HERO (2011) <br />Exposure frequency, residential EF, d/year 350 DTSC HERO (2011) <br />Exposure frequency, commercial/industrial EF,/, d/year 250 DTSC HERO (2011) <br />Exposure frequency, utility worker EFat d/year 250 DTSC HERO (2011) <br />Exposure time for outdoor air, residential ET, hours/day 24 DTSC HERO (2011) <br />Exposure time for outdoor air, <br />commercial/industrial <br />ET,/, hours/day 8 DTSC HERO (2011) <br />Exposure time for outdoor air, utility <br />worker ETut hours/day 8 DTSC HERO (2011) <br />Soil ingestion rate, residential child IRS. mg/d 200 DTSC HERO (2011) <br />Soil ingestion rate, residential adult IRSa mg/d 100 DTSC HERO (2011) <br />Soil ingestion rate, commercial/industrial /RS0 mg/d 100 DTSC HERO (2011) <br />Soil ingestion rate, utility worker I/6.f mg/d 330 DTSC HERO (2011) <br />Soil to skin adherence factor, residential <br />child <br />AF, mg/cm 2 0.2 DTSC HERO (2011) <br />Soil to skin adherence factor, residential <br />adult <br />AFc, mg/cm 2 0.07 DTSC HERO (2011) <br />Soil to skin adherence factor, <br />commercial/industrial AFc/, mg/cm 2 0.2 DTSC HERO (2011) <br />Soil to skin adherence factor, utility worker AF ut mg/cm 0.8 DTSC HERO (2011) <br />Skin surface area exposed to soil, <br />residential child SASc cm 2/d 2900 DTSC HERO (2011) <br />Skin surface area exposed to soil, <br />residential adult <br />SAS° cm 2 /d 5700 DTSC HERO (2011) <br />16