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<br />• Table 3.2-1 <br />Ore Sorter Radon Measurements, <br />Working Lirti~s (wl) <br />Date Monthly Average, wl <br />7-79 .O1 <br />8-79 .O1 <br />9-79 .O1 <br />10-79 .02 <br />11-79 ,O1 <br />12-79 .O1 <br />1-80 .O1 <br />2-80 .02 <br />3-80 .O1 <br />4-80 .03 <br />5-80 .O1 <br />Estimation of particulate released during crushing operation. <br />A. Assumptions: <br />• 1. Nominal production capacity: 600 tons per day. <br />2. 0.05 lbs - dust per ton crushed ore (Colo. APCD, 1977). <br />Q = 600 tons-ore x 0.05 1bs-dust x 252 work-days <br />may ton-ore Yr. <br />= 3.78 tons - Particulate <br />yr. <br />B. Controls: <br />1. The crusher feed is generally moist (10-12% moisture) which <br />suppresses small particle entrainment. <br />2. The crusher is located inside of the ore sorter building and <br />does not exhaust the particulate generated during crushing <br />operations directly into the atmosphere, although the sorter <br />building is vented. (See Figures 3.1-2 8 3.) <br />3. It should be noted that the ore from the mine is generally <br />quite moist. This acts to reduce the available silt conrent, <br />thereby reducing the source term to a number lower than rhat <br />which was ued in the calculations given above. While the sorter <br />building is vented, for the reasons stated above, it is not <br />considered a significant source term to the atmosphere. <br />11 <br />U <br />3-4 <br />