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Wes( Elk Mine <br />• reporting period (March 1977 -March 1980) aze presented in Exhibit 25. During this reporting <br />period, measured particulate values did not exceed the federal secondary standard for particulates or <br />the Colorado state ambient air standazd for particulates (160 µg/m'). <br />Based on the above data, it appeazs that the background TSP concentration is on the order of 20 <br />µg/m', 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 />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 />CJ <br />2.4-1 1 8 !/94 7805; 8/94 787/; 6/95 PR06 <br />