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i Air Pernv.laotioocaJJor rare~dto Cad C~IUq <br />• Emission Factor and Controls <br />The emission factor for drilling is 0.5"0.22 Ib/hole (AP~2, Table 8.24-4, dated 9/88). Annum <br />~ drilling will be 90 holes/day * 255 days/yeaz = 22,950 holes/yeaz. Bag collectors will be used <br />~ to reduce emissions. The bag collectors have a 90 percent efficiency in reducing emissions <br />(APCD Fugitive Particulate Emissions, Appendtz B). <br />Annual Emissions <br />Uncontrolled emissions will be 0.5 * 0.22 lb/hole * 22,950 holes/yeaz = 2524.50 Ib/yeaz <br />Controlled emissions will be 2524.50 lb/yeaz * .10 = 252.45 Ib/yeaz = 0.13 tons/yeaz <br />Drilling Overburden <br />Process Description <br />To prepare for blasting overburden, an average of 90 holes per days will be drilled to a depth of <br />20 to 30 feet. <br />• Emission Factor and Controls <br />The emission factor for drilling overburden is 0.5 * 1.3 lb/hole (AP~32, Table 8.24, dated 9/88). <br />Annual drilling will be 90 holes/day * 255 days/year = 22,950 holes/year. Bag collectors will <br />be used to reduce emissions. The bag collectors have a 90 percent efficiency in reducing <br />emissions (APCD Fugitive Particulate Emissions, Appendix B). <br />Annual Emissions <br />Uncontrolled emissions will be 0.5 * 1.3 ]b/hole * 22,950 holes/year = 14917.5 lblyeaz <br />Controlled emissions will be 14917.5 Ib/yeaz * .10 = 1491.75 ]b/yeaz = 0.75 tons/yeaz <br />Blasting <br />Process Description <br />Blasting of overburden and coal will occur an average of once per day for the 255 working days <br />per year at the Lorencito Canyon Mine. Generally, an area 150 ft X 150 ft will be blasted with <br />Arnmortium Nitrate explosives placed in 60 to 72 drill holes 300 feet deep in a 16 ft X 18 ft <br />• array. <br />a~r.J]SVanuary Il. 199] 18 <br />