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Appendix A-4: Unpaved Road Model Input Parameters and Dust Emissions Calculations <br />Overview <br />Summary of On-Road Vehicle Miles Travelled (VMT) for On-Site Activities <br />Existing Project <br />On-Site Transfer 48' Transfer HHDT 3,432 4,118 <br />On-Site Service Trucks Service Truck, Roll-off Truck, Gator LHDT1 4,888 5,340 <br />On-Site PM10 Dust Emissions from Unpaved Roads <br />Existing Project <br />On-Site Transfer 48' Transfer HHDT 0.958 829 994 <br />On-Site Service Trucks Service Truck, Roll-off Truck, Gator LHDT1 0.428 527 576 <br />1,355 1,570 <br />0.7 0.8 <br /> 3.71 4.30 <br />Assumptions <br />Pounds per ton 2,000 <br />Work days per year 365 <br />Dust control efficiency - Speed 44%Limit speed to 15 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 1.5 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; PM10D = coarse particulate matter (dust); lbs = pounds <br />Equation: <br />Emissions = Daily VMT * Emission Factor * (1 - Dust Control Efficiency) <br />Vehicle Type <br />Vehicle <br />Classification <br />Annual VMT <br />PM10D Emissions (lbs per year) <br />Information about on-site vehicle activities was provided by the project applicant. The main entry roads are paved, while the access roads extending to the fill areas and the perimeter road are unpaved. Emissions of <br />fugitive dust from on-site vehicle travel on unpaved roads were estimated using emissions factors from the U.S. Environmental Protection Agency's Compilation of Air Pollutant Emissions Factors (AP-42), Section 13.2.2 <br />Unpaved Roads . <br />Vehicle Type <br />Vehicle <br />Classification <br />EF <br />(lbs/VMT)Activity Description <br />Activity Description <br />Total emissions per Year (lbs) <br />Total emissions per Year (tons) <br />Annual Average emissions per Day (lbs) <br />Attachment A CAP Emission Calculations Page 26 of 30