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1 <br /> Human Health Screening Evaluation <br /> US Can—Welty Road March 19,2012 <br /> • Fluoranthene <br /> ' • Indeno(1,2,3-cd)pyrene <br /> • Phenanthrene <br /> • Pyrene <br /> Air Concentrations of VOCs from Soil <br /> SAIC used the estimated air concentration of VOCs volatilized from on-site soils into ambient <br /> air to estimate inhalation exposures, and subsequently inhalation hazards and risks from those <br /> chemicals. The concentration of VOCs in ambient air from on-site soils was calculated using the <br /> following equation(PEA Guidance Manual, Figure 2.7): <br /> 1 Ca=Ei/99 <br /> Where: <br /> 1 Ca=ambient air concentration, mg/m3 <br /> Ei—total emission rate for compound i (mg/second) <br /> 1 Air concentrations of the following volatile chemicals (PEA Guidance Manual) were estimated <br /> using this equation(Table 18): <br /> • Acenaphthene <br /> • Anthracene <br /> • Benzene <br /> • Ethylbenzene <br /> 1 • Fluorene <br /> • Naphthalene <br /> • Toluene <br /> 1 • Xylenes <br /> Emission Rate for VOCs <br /> ' SAIC calculated the emission rates from on-site soils to ambient air for VOCs (Table 19)using <br /> the following equation(PEA Guidance Manual, Figure 2.6): <br /> 1.6 X 105XDiX H` XCi <br /> Eo = Ka <br /> 0.023 <br /> 0.284 + 0.046 x �d <br /> H,, <br /> ' Where: <br /> Ei=average emission rate of contaminant i over the residential lot during the exposure <br /> interval, mg/sec <br /> ' Di=diffusivity in air for compound i, square centimeters per second(cm2/sec) <br /> He=Henry's Law constant, atmosphere(atm)-m3/mole <br /> iKd= soil-water partition coefficient, cm 3/g <br /> 9 <br /> SAIL <br /> 1 <br />