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Human Health Screening Evaluation <br /> Mountain House Development Site#6 January 18,2011 <br /> Ca= concentration in air, mg/m3 <br /> Section 5.3 describes how SAIC estimated the value for Ca using equations presented in the PEA <br /> Guidance Manual Figures 2.5, 2.6, and 2.7 for VOCs, and Figure 2.8 for non-VOCs. <br /> The inhalation cancer risk calculations for potential exposure to on-site soils are provided in <br /> Table 9. Potential cancer risks were estimated for carcinogenic COPCs and then summed among <br /> chemicals for inhalation exposures. <br /> SAIC summed the cancer risks for oral and dermal exposures (Table 8)with the risks for <br /> inhalation exposures (Table 9)to estimate the cancer risks across exposure routes for soil. The <br /> sum of oral, dermal, and inhalation cancer risks for soil are provided in Table 10. <br /> 5.2 RESIDENTIAL NON-CANCER HEALTH HAZARDS <br /> SAIC calculated the oral and dermal health hazards, and inhalation hazards for exposure to on- <br /> site soils for potential on-site residential receptors using the following equations: <br /> Oral and Dermal Hazards for Soil (PEA Guidance Manual, Figure 2.3): <br /> Hazardsoij= ([Cs/RfDoj x [1.28E-051) + ([Cs/RfDo] x [1.28E-041 x ABS) <br /> Where: <br /> Hazardsoil= oral and dermal non-cancer hazards from direct soil exposure <br /> Cs= concentration in soil, mg/kg <br /> RfDo =oral reference dose, in units of mg/kg-day <br /> ABS = dermal absorption fraction, dimensionless <br /> The oral and dermal hazard calculations for potential exposure to on-site soils are provided in <br /> Table 11. Potential non-cancer hazards were estimated for each COPC and then summed among <br /> chemicals for oral and dermal exposures. <br /> Inhalation Non-Cancer Hazard for Air(PEA Guidance Manual, Figure 2.4): <br /> Hazardair= (Ca/RfDi) x 0.639 <br /> Where: <br /> Hazardair= inhalation non-cancer hazard from indirect soil exposure <br /> RfDi=the inhalation reference dose, mg/kg-day <br /> Ca= concentration in air, mg/m3 <br /> Section 5.3 describes how SAIC estimated the value for Ca using equations presented in the PEA <br /> Guidance Manual Figures 2.5, 2.6, and 2.7 for VOCs, and Figure 2.8 for non-VOCs. <br /> The inhalation hazard calculations for potential exposure to on-site soils are provided in <br /> Table 12. Potential hazards were estimated for each COPC and then summed among chemicals <br /> for inhalation exposures. <br /> 7 SAI`® <br /> from sclence to swgtloRs <br />