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On-Site PM2.5 Dust Emissions from Unpaved Roads <br />Existing Project <br />On-Site Transfer 48' Transfer HHDT 0.096 82.9 99.4 <br />On-Site Service Trucks Service Truck, Roll-off Truck, Gator LHDT1 0.043 52.7 57.6 <br />136 157 <br />0.07 0.08 <br /> 0.37 0.43 <br />Assumptions <br />Pounds per ton 2,000 <br />Work days per year 365 Information provided by project applicant <br />Dust control efficiency - Speed 44%Limit speed to 25 mph (WRAP Fugitive Dust Handbook, Table 6-6) <br />Dust control efficiency - Watering 55%Water twice per day (WRAP Fugitive Dust Handbook, Table 6-6) <br />Surface Material Silt Content (s)2.6 Percent (AP-42, 13.2.2-1, Unpaved Road Surface Material Silt Content Values Used in the 1999 NEI) <br />Mean Vehicle Weight (W) - Service Truck 5 Tons based on upper-bound LHDT1 weight <br />Mean Vehicle Weight (W) - Haul Trucks 30 Tons based on upper-bound HHDT weight (total weight of the truck combined with its maximum capacity when loaded) <br />Empirical Constant k 0.15 lbs/VMT, AP-42, Table 13.2.2‐2 <br />Empirical Constant a 0.9 AP-42, Table 13.2.2‐2 <br />Empirical Constant b 0.45 AP-42, Table 13.2.2‐2 <br />Days of Precipitation (P)37.4 CalEEMod Default for the project location <br />Emission Factor (lbs/VMT)k*(s/12)a*(W/3)b*[(365-P)/365]AP-42, Equation 13.2.2.(1a) <br />Abbreviations <br />EF = emission factor; g = grams; m = meter; VMT = vehicle miles travelled; PM2.5D = fine particulate matter (dust); lbs = pounds <br />Equation: <br />Emissions = Daily VMT * Emission Factor * (1 - Dust Control Efficiency) <br />PM2.5D Emissions (lbs per year) <br />Total emissions per Year (lbs) <br />Total emissions per Year (tons) <br />Annual Average emissions per Day (lbs) <br />Vehicle Type <br />Vehicle <br />Classification <br />EF <br />(lbs/VMT)Activity Description <br />Attachment A CAP Emission Calculations Page 27 of 30