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r -~ - - ~ - -- -,~ ~ <br />~, ~ ..T - -~.- <br />- -~ ~- ENGINEERING &SURVEYING COMPANY <br />BOX 874 • 443 DODGE • DELTA, COLORADO 81416 • 303-874.7593 <br />f 7881-87 - - _ <br />Subsidence and Slope Stability <br />I <br />~~ <br /> <br /> <br />February 2, 1988 <br />Mined Land Reclamation <br />423 Centennial Building <br />1313 Sherman Street <br />Denver, Colorado 80203 <br />Attention: Cathy Begej <br />Re: Subsidence and Slope <br />Bear Coal Company <br />Bear Mine No. 2 <br />Bear Mine No. 3 <br />Somerset, Colorado <br /> <br />Fig a 1938 <br />pA1NED ~,._.._ <br />RECLAMA71ON Ji'd+`StON <br />Stability monitoring: <br />UTE ENGINEERING AND SURVEYING COMPANY completed a subsidence and <br />slope stability survey during October 1987 for the Bear Mine #3 <br />and the Old Bear Mine #2. <br />These surveys are based on 2 control monuments located across the <br />canyon on the property of the Kaiser Coal Company (Formerly U. S. <br />Steel), that have been in place for several years. The monuments <br />are referred to as D-11-U and D-12-U. See Map for location. <br />The monuments are 3-inch pipe with a 4-inch plate so the eleva- <br />tion will be fixed for each reading. The coordinates of the <br />monuments are: <br />Northing Easting Elevation <br />D-11-U 405,065.78 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 <br />stations 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 />C, <br />J <br />