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2005 Subsidence end Geologic Fieid Observatana <br />Box Canyon, West Flatiron, Apache Rocks, <br />arxf South of Divide honing Areas <br />Figure 5. Southward view of a large landslide located south of and locally beneath Highway 133. In <br />contrast to the large landslide east of the mouth of Box Canyon, which was essentially one episode. this <br />slide occurred in multiple episodes land likely multiple sup planes) dunng periods of high precipitation rn <br />the mid 1980s and mid 1990s. The toe of the landslide has locally slid north of the highway to the edge of <br />the North Fork (middle loreground). <br />Phis landslide is la;uted within the area of mining influence of the northern and western edge of <br />projected un-mined longwall panel 18 and the entries to it. The overburden depth to the B-Seam <br />ranges Ir,nn ahuut ?Oll to GI)0 feet <br />4.3 Traverse B-B' <br />lYavcrsc B-13' is a ftwt travcne from methane drainage wells IMD11's) 19-01 and IN-OZ to the <br />nurtheaaern cliff point ana on 1Vcst flatiron. The GPS I~x'ation of B is 291.031 mE. 4.310,347m <br />N (l'Tht. VAD 1983, cinac of error 3-Gm ); B': 291,24Im E. 4,310.601ti (cinlc of error. G ~)ml. <br />Phis traverse was aMn-e the eastern part of un-mined longwall panel 19 in light gray to light <br />reddish hrown soil and colluvium of the Wasatch Formation and sandstones of the Ohio Creek <br />Memlxr of the Mesavcrdc ['ormution. "fhc overburden thickness to the B-Scams range from <br />LrxXl to 2,250 feet. <br />831.032J10 Wnghl WaterEnginaera.lnc. Page td <br />Novomber2005 <br />