2015-12-16_GENERAL DOCUMENTS - C1981035 ‎(2)‎

• Permit No: C1981035
• IBM Index Class Name: General Documents
• Doc Date: 12/16/2015
• Doc Name: Air Quality Modeling Analysis by McVehil-Monnett /EPA Brocure EPA Fax Sheet on Particle Pollution
• From: Luke Danielson
• To: DRMS
• Permit Index Doc Type: General Correspondence
• Email Name: RAR
• Email Name: DIH
• Media Type: D
• Archive: No

Emission Calculations
Traffic data (vehicle classifications and number of daily trips) were provided in Table 6 of the
Roadrunner TIA. The two levels of traffic analyzed in this study are defined in the referenced
report as:
• Year 2014
• Peak
Table 6 of the Roadrunner TIA is reproduced below.
Emission calculations were performed following methods detailed in EPA Publication AP -428.
AP -42 Sections 13.2.1 and 13.2.2 present the PMIo emission equations for paved and unpaved
roads, respectively. Calculation details are provided below for both road sections.
Paved Section of County Road 120
The quantity of PMIo emitted from resuspension of loose material on the road surface due to
vehicle travel on a dry paved road is estimated by the following equation:
E (PMIo) = 0.0022 (sL)0.91 (W)1.02
<Equation 1>
where: E (PMIo) = PMIo emission factor (pounds per vehicle mile traveled [lb/VMT])
sL = road surface silt loading (grams per square meter [g/m2])
W = average vehicle weight (tons)
Year 2014 Traffic Level
For this traffic level, the "sL" term is conservatively estimated at 4 g/m2 based on AP -42 Table
13.2.1-2. The average vehicle weight is calculated as follows:
225 transport truck trips @ 30 tons
11 delivery truck trips @ 10 tons
303 employee vehicle trips n, 2.5 tons
539 total trips @ 14.13 tons average
s U.S. EPA. Compilation of Air Pollutant Emission Factors, Fifth Edition, Office of Air Quality Planning and
Standards, Research Triangle Park, NC. January 1995.
9250 East Costilla Avenue 1 Suite 630 1 Greenwood Village, Colorado 80112 5
303/790-1332 1 Fax [phone]
www.mevehil-monnett.com
Year 2014 - 940,000 tons
Peak - 1,300,000 tons
Miners, Superintendent,
Managers & Accounting
150 individuals
165 individuals
Vehicle T e
Tri s/da
Trips/day
Car/Truck
303 tris
334 trips
Fuel Truck/Delivery Truck
11 tris
15 trips
Transports
225 tris
312 trips
Total Tris
539 tris
661 trips
Emission calculations were performed following methods detailed in EPA Publication AP -428.
AP -42 Sections 13.2.1 and 13.2.2 present the PMIo emission equations for paved and unpaved
roads, respectively. Calculation details are provided below for both road sections.
Paved Section of County Road 120
The quantity of PMIo emitted from resuspension of loose material on the road surface due to
vehicle travel on a dry paved road is estimated by the following equation:
E (PMIo) = 0.0022 (sL)0.91 (W)1.02
<Equation 1>
where: E (PMIo) = PMIo emission factor (pounds per vehicle mile traveled [lb/VMT])
sL = road surface silt loading (grams per square meter [g/m2])
W = average vehicle weight (tons)
Year 2014 Traffic Level
For this traffic level, the "sL" term is conservatively estimated at 4 g/m2 based on AP -42 Table
13.2.1-2. The average vehicle weight is calculated as follows:
225 transport truck trips @ 30 tons
11 delivery truck trips @ 10 tons
303 employee vehicle trips n, 2.5 tons
539 total trips @ 14.13 tons average
s U.S. EPA. Compilation of Air Pollutant Emission Factors, Fifth Edition, Office of Air Quality Planning and
Standards, Research Triangle Park, NC. January 1995.
9250 East Costilla Avenue 1 Suite 630 1 Greenwood Village, Colorado 80112 5
303/790-1332 1 Fax [phone]
www.mevehil-monnett.com