Laserfiche WebLink
1 <br /> Human Health Screening Evaluation <br /> US Can—Welty Road March 19,2012 <br /> Inhalation Non-Cancer Hazard for Air(PEA Guidance Manual, Figure 2.4): <br /> Hazard.;,_(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 3.4.3 describes how SAIC estimated Ca using equations presented in PEA Guidance <br /> 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 15. Potential hazards were estimated for PAH COPCs and then summed among chemicals <br /> for inhalation exposures. <br /> SAIC then summed the health hazards for oral and dermal exposures (Table 14)with the hazards <br /> for inhalation exposures (Table 15)to estimate the hazards across exposure routes for on-site I <br /> soils. The sum of oral, dermal, and inhalation non-cancer hazards for on-site soils is provided in <br /> Table 16. <br /> 3.4.3 Air Concentrations of Organic Compounds from Soils I <br /> SAIC also calculated the estimated air concentrations of non-VOCs (as wind-blown, suspended- <br /> soil particulates) and VOCs (following volatilization into ambient air)using equations presented <br /> in the PEA Guidance Manual. These equations are shown in the following sections. I <br /> Air Concentrations of Non-VOCs from Soil <br /> SAIC used the estimated ambient-air concentration of non-VOCs as wind-blown, suspended soil <br /> particulates to estimate inhalation exposures, and subsequently inhalation risks and hazards from <br /> those chemicals. The air concentration of non-VOCs in ambient air was calculated using the <br /> following equation(PEA Guidance Manual, Figure 2.8): <br /> Ca=Cs x(5E-08 kg/m3) <br /> Where: <br /> Ca=concentration in air, mg/m3 <br /> Cs=concentration in soil, mg/kg <br /> The air concentrations of the following non-volatile PAHs were estimated using this equation <br /> (Table 17): <br /> • Benzo(a)anthracene <br /> • Benzo(a)pyrene <br /> • Benzo(b)fluoranthene <br /> • Benzo(g,h,i)perylene <br /> • Benzo(k)fluoranthene <br /> • Chrysene <br /> • Dibenzo(a,h)anthracene <br /> 8 ' <br /> SAIE <br />