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reporting period (Mazch 1977 -March 1980) are presented in Exhibit 25. During this reporting <br />period, measured particulate values did not exceed the federal secondary standazd for particulates or <br />the Colorado state ambient air standazd for particulates (160 µg/m3), <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 anihropogenic sources which detracts slightly from Aideal= 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 neaz (about 400 <br />m) a local underground coal mine with surface crushing facilities and unit train load out. <br />• <br />L~ <br />2.04-123 I/94 TROS; 8/94 TR71; 6/95 PR06, /I/04 PR10 <br />