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iiiiiiiiiiiiiiiiiii <br />'~' ~ 999 <br />ENGINEERING & SURVEYING COMPANY <br />443 DODGE ST. • DELTA, COLORADO 81416 • 303-874-7593 • FAX 303-874-7570 <br />7881-92 <br />Subsidence and Slope Stability <br />October 13, 1992 <br />Mined Land Reclamation <br />423 Centennial Building <br />1313 Sherman Street <br />Denver, Colorado 80203 <br />Re: Subsidence and Slope <br />Bear Coal Company <br />Bear Mine No. 3 <br />Somerset, Colorado <br />R~~~f~!~ <br />~OCT 2 6 ]992 <br />DIVISiur, ,_,~ <br />MINERALS & i;E;;,_: .,~; <br />Stability monitoring: <br />UTE ENGINEERING AND SURVEYING COMPANY completed the subsidence <br />and slope stability survey during July, 1992 for the Bear Mine <br />#3. <br />This survey is based on 2 control monuments located across the <br />canyon on the property of the Somerset Mining Company (formerly <br />Kaiser Coal Company), that have been in place for several years. <br />The monuments are referred to as D-11-U and D-12-U. See Map for <br />location. The monuments are 3-inch pipe with a 4-inch plate so <br />the elevation will be fixed for each reading. The coordinates of <br />the monuments are: <br />Northing Easting Elevation <br />D-11-U 40.5,065.78 1,440,549.57 6185.92 <br />D-12-U 405,418.32 1,441,625.51 6195.50 <br />These coordinates and elevations will remain fixed and all other <br />points will be relative to them. <br />We have developed a sequence for the surveys that divides the sta- <br />tions into primary control loops and points tied by sideshot <br />only. All stations are 3" diameter steel pipe described in our <br />report dated August 10, 1985 unless noted otherwise. <br />