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West Elk Mute <br />• reporting period (March 1977 -March 1980) are 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 standard for particulates (160 µg/m~. <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 Kfiich 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 near (about 400 <br />m) a local underground coal mine with surface crushing facilities and unit train load out <br />• <br />• <br />2Qf-723 //947805; 8/947871; N95 PR06;Afmrh 2006 PR/0 <br />