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AIR POLLUTION CONTROL DIVISION <br />COLORADO DEPARTMENT OF HEALTH <br /> <br />PRELIMINARY ANALYSIS <br />Page 7 of L <br />PERMIT NUMBER C- C-13,004(1-4bpplicant's Name '.lestern Slooe Carbon <br />• <br />• <br />Dale 10-20-80 <br />Review Engineer Scot[ J. Miller <br />Control Engineer <br />Air duality Analysis <br />~ = 90.5 TPY = 65 9/sec <br />This source is just above the recently permitted Mt. Gunnison Coat Mine proposed by <br />ARCO Coal Company. Therefore, emissions from both projects must be added together. <br />The analysis performed by ARCO was a ventilated box model with the most downstream <br />box sl~o~~~ing the following: <br />Volume: 6.0 x 106 m3 <br />Flushing Frequency: 115 sec. <br />Concentration due to ARCO: 72.9 ug/m3 <br />Ctotal - CARGO + CUSC <br />for a 2G hour maximum concentration <br />C115C = (14) (C) <br />24 <br />C = Q - (6.5 g/sec) _ (6.5 9/sec)(115 sec) <br />(V%FF) 6.0 x 10 m 6.0 x 10 m3 <br />( 115 sec ) <br />= 1.24 x 10-4 9/m3 = 124 ug/m3 <br />C~.15C = 72.3 ug/m3 <br />Ctotal = 1G5.2 ug/m2 <br />APC-73 (5-76) <br />