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Appendix G AIR QUALITY TECHNICAL DATA AIR QUALITY METHODOLOGY AND ASSUMPTIONS CALCULATION OF ON-SITE EMISSIONS To estimate PM-10 emissions from material unloading, sorting and loading the relationship developed for aggregate handling was utilized from the U. S. Environmental Protection Agency' s AP-42 ; Emission (lbs/ton) = k* (0. 0032) * (M/2)9.4 where: k = particle size multiplier (0. 35 for PM-10) U = mean windspeed in miles per hour (taken as 2 mph within the transfer station building) M = material moisture content (assumed to be 5%) The resulting emission factor is 0.0021 lbs/ton. Daily emissions were estimated on the average tons/day of material received, assuming that all material is handled three times for unloading, sorting and loading. Equipment exhaust emissions were calculated by multiplying a daily usage factor times the per-hour emission factors in the U. S. Environmental Protection Agency's - 2. Equipment usage within the transfer station was assumed to be 9 hours/day in 1995 (without the addition of Corral Hollow refuse) . Equipment usage was assumed to be 13 hours per day in 1995 with Corral Hollow refuse. The year 2010 equipment usage was assumed to be 14 hours/day. CALINE-4 The CALINE-4 model is a fourth-generation line source air quality model that is based on the Gaussian diffusion equation and employs r a mixing zone concept to characterize pollutant dispersion over the roadway. Given source strength,meteorology, site geometry and site characteristics, the model predicts pollutant concentrations for receptors located within 150 meters of the roadway. The CALINE-4 model allows roadways to be broken into multiple links that can vary in traffic volume, emission rates, height, width, etc. . A screening-level form of the CALINE-4 program was used to predict U. S. Environmental Protection Agency, Compilation of Air Pollutant Emission Factors, AP-42 , 1985. G-1