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7. Aerodynamic particle size for equation is for particles 10 um or less (k) <br /> 8. Dry road(worst-case)conditions:precipitation(p) - d <br /> 9. Operating season - 30 weeks/year, 5 days/week- 150 dys/yr <br /> 10. Control effectiveness of dust control -68;x, (AP-42) <br /> Emission Calculation: <br /> E=0.36*(5.9)*(4.8112)*(15130)*(92.513)"0.7'x(8/4)".S+((150-0)/150) <br /> E = 6.6 lh/VMT <br /> (64 trps/day)(I mile/trip)(6.6 lbs PM 10/trip)-422 lbs PM 10/day, uncontrolled <br /> (422 lb/day)(150 days/year)(1 ton/20001bs)=3I.7 tons PM10/yenr, uncontrolled <br /> Controlled PM-10 emissions(68% con(rol)= (1-.68)(31.7 tonslyr) = 10.1 tns/yr <br /> Note that this is n conservative eslimnle for the life of the road because the equation does not consider the <br /> reduction in silt content of the rond surface due to the vacuuming effect of trnffic: the fines are continually <br /> removed by traffic, leaving a higher percentage of coarse materials, thus reducing the PM10 emissions)(AP-42, <br /> p. 11.2.1-1). <br /> 3. TRUCKS/EQUIPMENT AT EXTRACTION SITE <br /> Emission factors for loader, scraper from Tnble 1I-7.1 of AP-42, Vol. 11. <br /> Emission factors for haulers from EMPAC7PC <br /> Emission Factors (g/hphr) Emission Rates (lb/day) <br /> Daily I Exhaust <br /> Equipment(no.) Thruput + TOG CO NOx PM TOO ROG CO NOx PM <br /> ---------- ----------- ---- ----------- ------ ------- ------- --------- ------- ------ ------ ------ ------ <br /> Wheeled Loader (1) 624 HP-HR 0.97 2.71 8.81 0.805 1.33 1.15 3.73 12.12 1.11 <br /> Scraper (1) 2376 HP-HR ( 0.55 2.45 7.46 0.789 ] 2.88 2.48 12.84 39.08 4.13 <br />