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Item A: Public Hearing onMetro Plan Amendment (Delta Sand and Gravel)
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Item A: Public Hearing onMetro Plan Amendment (Delta Sand and Gravel)
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6/9/2010 12:58:15 PM
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12/7/2006 11:34:08 AM
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Agenda Item Summary
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12/12/2006
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<br />Permit No. 202119 <br />Delta Sand Gravel <br /> <br />ATTACHMENT A <br /> <br />Unpaved Haul Roads <br /> <br />Overview <br />Source Category Unpaved Roads <br />Source Description Industrial unpaved road <br />road length, miles 1.3 <br />Location Western U~ <br /> <br />Haul Trucks <br />Round trip frequency (haul trucks/1 hr) 7 <br />Number of haul trucks 2.25 <br />Roundtrip length (miles) 2.6 <br />Total vehicle mileage of 2 haul trucks (mph) 40.95 <br />Work Days, days/year 260 <br />Total vehicle mileage of 2 haul trucks (miles/yr) 10647 <br /> <br />Emission Factor <br />PM10 Emission Factor Equation (TPY) Ea = (VMT)((k*5.9)*(s/12)*(S/30)* <br />((W/3 )^O. 7)*((w/4)^O.5)*(365-p )/365)) <br />Reference for PM1 0 EF Equation SDAPCD <br />PM2.5/PM 10 ratio 0.1 <br />Reference for PM2.5/PM10 Ratio MRI, WRAP, 2006 <br />Emission Factor (Ibs/hr)/hr Eh =Ea/(Da*H) <br />Reference SOAPeD, 2006 <br /> <br />Emission Factor Variables <br />k = particle size parameter (PM 10) 1.5 <br />s--silt content' (0/0) 4.4 <br />Reference AP-42 Addendum <br />S--Mean Vehicle Speed, (miles/hour) 10 <br />w = Number of vehicle wheels 6 <br />P = Precipitation> .01 inches, days/yr 140 <br />Reference NOAA, 2005 <br />Days of facility operations/activity (days/yr) 260 <br />H = Active hours, hours/day 8 <br />W--vehicle weight (tons) 67.7 <br /> <br />Control Methods and Efficiencies <br />Control Measure 1 Surface Improvement <br />Material gravel haul road <br />Condition Compact Surface/Smooth <br />Control Efficiency 500/0 <br />Reference MRI, 2006 <br />Control Measure 2 Watering <br />Water Truck Frequency, trips/hour 4 <br />Number of Water Trucks 2 <br />Volume of Water Per Truck (gals) 5000 <br />Control Efficiency 750/0 <br />Reference AP-42 <br />PM10 Emissions <br /> Uncontrolled PM 10 (tons/yr) 39 <br /> Controlled PM 10 (tons/yr) 5 <br /> Uncontrolled PM 1 0 (Ibs/hr) 37 <br /> Controlled PM 10 (Ibs/hr) 5 <br /> <br />PM2.5 Emissions <br />Controlled PM2.5 (tons/yr) 0.5 <br />PM2.5 (Ibs/hr) 0.5 <br /> <br />'4 <br />
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