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Human Health Screening Evaluation <br /> Surland Homes—Bridle Creek February 12,2004 <br /> As discussed in section 5.3, the value for Ca was estimated using equations presented in PEA <br /> Guidance Manual Figures 2.5, 2.6, and 2.7 for VOCs, and Figure 2.8 for non-VOCs. <br /> Table 12 shows the inhalation hazard calculations for potential residential exposure to soil at the <br /> site. Potential hazards were estimated for BTEX, PAHs, and metals, and then summed among <br /> chemicals for inhalation exposures. <br /> The health hazards for oral and dermal exposures (Table 11) were then summed with the hazards <br /> for inhalation exposures (Table 12) to estimate the residential hazards across exposure routes for <br /> soil. Table 13 shows the sum of oral, dermal, and inhalation non-cancer hazards for soil. <br /> 5.3 CONSTRUCTION WORKER SCENARIO <br /> ' Using the PEA Guidance methodology as described in sections 5.1 and 5.2, and the exposure <br /> parameters for the construction worker listed in Table 7, cancer risks and non-cancer hazard <br /> were estimated for exposures to soil via oral, dermal, and inhalation pathways. Equations and <br /> calculations for the construction worker scenario are provided in Tables 14 through 16 (cancer <br /> risk) and Tables 17 through 19 (non-cancer hazard). <br /> i5.4 AIR CONCENTRATIONS OF NON-VOLATILE ORGANIC COMPOUNDS <br /> AND VOLATILE ORGANIC COMPOUNDS FROM SOILS <br /> The estimated air concentrations of non-VOCs (as wind-blown, suspended-soil particulates) <br /> were also calculated using equations provided by Cal/EPA in the PEA Guidance Manual. Those <br /> equations are described in sections 5.4.1 and 5.4.2. <br /> 5.4.1 Air Concentrations of Non-Volatile Organic Compounds from Soil <br /> ' The estimated ambient air concentration of non-VOCs as wind-blown, suspended-soil <br /> particulates was used to estimate inhalation exposures, and subsequently inhalation risks and <br /> hazards from those chemicals. The air concentration of non-VOCs in ambient air was calculated <br /> using the following equation (PEA Guidance Manual, Figure 2.8): <br /> Ca = Cs x (5E-08 kg/ms) <br /> 1 Where: <br /> Ca= concentration in air, mg/m3 <br /> Cs = concentration is soil, mg/kg <br /> Air concentrations of the following non-volatile PAHs were estimated using this equation (Table <br /> 20): <br /> • Benzo(a)anthracene <br /> Benzo(a)pyrene <br /> • Benzo(b)fluoranthene <br /> • Benzo(g,h,i)perylene <br /> ' • Chrysene <br /> • Dibenz(a,h)anthracene <br /> 9 --WAr <br /> mmwrj"■%. 's <br /> From Science to Solutions <br />