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SOIL-TO-AIR PARTICULATE EMISSION FACTOR (PEF) <br /> Equation 4-11: Derivation of the Particulate Emission Factor <br /> PEF(m3/kg) = Q/C X 3600s/h <br /> 0 . 036 x (1—V) X (U I U,) 3 x F(X) <br /> Parameter Definition (units) j2efautt <br /> PEF Particulate emission factor (m'lkg) 1. 316 x 100 <br /> Q/C Inverse of the mean concentration at the center 90.80 <br /> of a 0.5-acreaquare source (g/m2-s per kg/m') <br /> V Fraction of vegetative cover (unitless) 0.5 <br /> U, Mean annual windspeed (m/s) 4.69 <br /> U, Equivalent threshold value of windspeed at 7 m (m/s) 11.32 <br /> F(x) Function dependent on U fU, derived using 0.194 <br /> Cowherd (1985) (unitless) <br /> REFERENCES <br /> ASTM. 1995. Standard Guide for Risk-Based Corrective Action Applied at Petroleum Release Sites. <br /> Designation E 1739 - 95. Philadelphia, Pennsylvania. <br /> California EPA. 1994. Preliminary Endangerment Assessment Guidance Manual: Department of Toxic <br /> Substances Control, Sacramento, California. <br /> Cowherd, C., G. Muleski, P. Engelhart, and D. Gillette. 1985. Rapid Assessment of Exposure to Particulate <br /> Emission from Surface Contamination. EPA/600/8-851002. Prepared for Office of Health and <br /> Environmental Assessment, U.S. Environmental Protection Agency, Washington, DC. NTIS P885- <br /> 192219 7AS. <br /> Howard, P.H. 1990. Handbook of Environmental Fate and Exposure Data for Organic Chemicals. <br /> Lewis Publishers, Chelsea Michigan. <br /> U.S. EPA. 1988. Superfund Exposure Assessment Manual. EPA64011-88/001. Office of Emergency and <br /> Remedial Response, Washington, DC. <br /> U.S. EPA. 1990a. Subsurface Contamination Reference Guide. EPA/5402-901011. Office of Emergency and <br /> Remedial Response, Washington, DC. <br /> 21 <br />