_PERMIT FILE - M1981302 ‎(25)‎

• Permit No: M1981302
• IBM Index Class Name: Permit File
• Doc Name: AIR QUALITY
• Media Type: D
• Archive: No

This emission factor from EPA is only a rough approximation
and is very conservative (i .e. , it over-estimates the TSP
production) . EPA is currently in the process of revising
its estimate of suspended particulate released by mining
downward based on recently collected data. The 0 . 1 lb. per
ton figure was set in the early 1970 's and was based on
little actual data. For planned production at the Flatiron
operation, using the 0. 1 lb. EPA figure would result in an
average release rate of 68 lbs . of particulate per day.
Peak rates during -working days in the highest production
season could be approximately twice this value. Similar
estimates for release of dust and particulate in crushing,
screening, conveying and storage range from 0. 001 to
0. 6 lbs . of particulate per ton. Many of these estimates
are for essentially uncontrolled operations however, and
are not applicable to the proposed project where a variety
of pollution control measures will be applied.
The State of Colorado emission control regulations do not
specify quantitative limits to the emission of pollutants
from gravel mining and processing. Rather they specify a
number of control procedures that must be used. These
• include paving or wetting, of roadways , spray bars for
wetting of material in crushing and processing, control
of windblown dust from storage piles , limitations on area
G-8