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West Elk Mine <br /> <br /> <br />2.04-122 Rev. 08/94- TR71, 06/95- PR06, 03/06- PR10;05/22- MR462 <br />the Colorado state ambient air standard for particulates (160 µg/m3). <br /> <br />Based on the above data, it appears that the background TSP concentration is on the order of 20 <br />µg/m3, which is typical for a site like the West Elk Mine. The West Elk Mine site is currently <br />subject to minor impacts from anthropogenic sources which detracts slightly from ideal pristine <br />conditions. <br /> <br />Only one high-volume sampler was used. This sampler was located at Site 2 (Figure 12) atop a <br />scaffold with the intakes at a height of 4.7 m above the surface. Site 2 was located near (about 400 <br />m) a local underground coal mine with surface crushing facilities and unit train load out. <br /> <br /> Figure 13 Diurnal Variation of Average Air Temperature at Site 1 and 3 During the 1977 <br />Spring Quarter, West Elk Mine <br /> <br /> <br /> <br />