_PERMIT FILE - M1981302 ‎(34)‎

• Permit No: M1981302
• IBM Index Class Name: Permit File
• Doc Name: FIGURE G-2 MAXIMUM ESTIMATED DUST EMISSIONS FROM GRAVEL PRODUCTIONS AT DEEPE FARM PROJECT
• Media Type: D
• Archive: No

• Figure G-1
Particulate Emission Calculations
1. Mining
Emission Factor = 0 . 1 lb/ton (Ref. 1)
Production Rate = 250, 000 tons/year
Operation 5 days/week, 52 weeks/year
Annual: 0 . 1 x 250,000 = 25 ,000 lb/year = 12 . 5 ton/year
24-hour: 25,000 x 1 = 96. 2 lb/day = 4 . 0 lb/hour
5x52
2. Crushing
Emission Factor = 0 . 0015 lb/ton (Ref. 2)
Production Rate = 250 ,000 tons/year
Operation 5 days/week, 52 weeks/year
Control = 500 (wet suppression)
Annual: 0. 0015 x 250 ,000 x 0 . 5 = 187. 5 lb/year = 0 . 094 ton/yr.
24-hour: 187. 5 x 1 = 0 . 72 lb/day = 0 . 03 lb/hour
5x52
3. Storage Pile Wind Erosion
Emission Factor = 0 . 11 lb/ton (Ref. 3)
Throughput = 250 , 000 ton/year
Storage 365 days/year
Annual: . 0 . 11 x 250,000 = 27 , 500 lb/year = 13. 75 ton/year
24-hour: 27 , 500/365 = 75 . 3 lb/day = 3 . 14 lb/hour
4 . Conveying and Handling
Emission Factor = 0 .02 lb/ton (Ref. 4 gives a factor of
0. 2 lb/ton; this factor is unreasonably large for gravel
• products which will normally be wet. A value of 0 .02 has
been assumed on the basis of experience and professional
judgement)
Production Rate = 250 ,000 ton/year
Operation 5 days/week, 52 weeks/year
/• Annual: 0.02 x 250,000 = 5000 lb/year = 2. 5 ton/year
l 24-hour: 5600 x 1 = 19 .2 lb/day = 0 . 80 lb/hour
5x52
Continued next page
G-21