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Table 4: Default Exposure Parameters (concluded) Parameter Variable Name Units Value Reference Skin surface area exposed to soil, commercial/industrial SASo CM 2/d 5700 DTSC HERO (2011) Skin surface area exposed to soil, utility worker SAS„ CM 2 /d 5700 DTSC HERO (2011) Particulate emission factor, residential PEFr m 3/kg 1.3 x 109 DTSC HERO (2011) Particulate emission factor, commercial/industrial PEF0 m 3/kg 1.3 x 109 DTSC HERO (2011) Particulate emission factor, utility worker PEF„ m 3/kg 1.0 x 106 DTSC HERO (2011) Dermal absorption factor from soils ABSd unitless See Table 7 Gastrointestinal absorption factor GIABS unitless See Table 7 Oral cancer slope factor SF° 1/(mg/kg-d) See Table 7 Inhalation Unit Risk IUR 1/(ug/m 3) See Table 7 Oral reference dose RfD° mg/kg-d See Table 7 Inhalation reference dose RfC mg/m 3 See Table 7 Target hazard quotient THQ unitless 1 OEHHA (2005) Target individual excess lifetime cancer risk TR unitless 1 x 10-6 OEHHA (2005) References: ASTM (1996). American Society for Testing and Materials, Standard Guide to Risk-Based Corrective Action Applied a: Petroleum Release Sites, ASTM E1739-95, Philadelphia, PA. DTSC HERO (2011). Department of Toxic Substances Control, Office of Human and Ecological Risk (HERO). Human Health Risk Assessment (HHRA) Note Number 1. Recommended DTSC Default Exposure Factors for Use in Risk Assessment at California Hazardous Waste Sites and Permitted Facilities. May 20, 2011 OEHHA (2005). Human-Exposure-Based Screening Numbers Developed to Aid Estimation of Cleanup Costs for Contaminated Soil, Integrated Risk Assessment Branch, Office of Environmental Health Hazard Assessment. (Cal/EPA). USEPA. 1989 Risk Assessment Guide for Superfund (RAGS) Volume I Human Health Evaluation Manual (Part A) EPA/540/1-89/002, Office of Emergency and Remedial Response. December 1989. 17