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Human Health Screening Evaluation <br /> Former Vernalis Pump Station September 2,2010 <br /> and hazards from exposures to those chemicals. The air concentration of non-VOCs in ambient <br /> air was calculated using the following equation(PEA Guidance Manual, Figure 2.8): <br /> Ca= Cs x(5E-08 kg/m 3) <br /> Where: <br /> Ca= concentration in air, mg/m3 <br /> Cs = concentration is soil, mg/kg <br /> SAIC-Benham used this equation to estimate air concentrations of the following non-volatile <br /> PAHs (Table 16): <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 /> • Fluoranthene <br /> • Indeno(1,2,3-cd)pyrene <br /> • Phenanthrene <br /> • Pyrene <br /> 5.3.2 Air Concentrations of Volatile Organic Compounds from Soil <br /> SAIC-Benham used the estimated air concentration of VOCs volatilized from on-site soils into <br /> ambient air to estimate inhalation exposures, and subsequently inhalation hazards and risks from <br /> exposure to those chemicals. The concentration of VOCs in ambient air from soils was <br /> calculated using the following equation (PEA Guidance Manual, Figure 2.7): <br /> Ca=Ei/99 <br /> Where: <br /> Ca= ambient air concentration, mg/m3 <br /> Ei=total emission rate for compound i; mg/second <br /> SAIC-Benham used this equation to estimate air concentrations of the following volatile <br /> chemicals (Table 17): <br /> • Toluene <br /> • Ethylbenzene <br /> • Xylene(s) <br /> • Acenaphthene <br /> • Fluorene <br /> • Naphthalene <br /> 9 � The Benham Companies,LLC <br /> A Wholly Owned Subsidiary <br /> From S mxt to Solanoss <br />