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~~ ENGINEERING & SURVEYING COMPANY <br />BOX 674 • 443 DODGE • DELTA, COLORADO 81416 • 303-874.7593 <br />7881-92 <br />Subsidence and Slope Stability <br />LIAR 2 3 199. <br />• <br />March 17, 1992 <br />Mined Land Reclamation <br />215 Centennial Building <br />1313 Sherman Street <br />Denver, Colorado 80203 <br />Attention: Matthew S. Hayes <br /> <br />Mined Land <br />coo,,,.. _.....~,....,. <br />Re: Subsidence and Slope Stability monitoring: <br />Bear Coal Company <br />Bear Mine No. 3 <br />Somerset, Colorado <br />UTE ENGINEERING AND SURVEYING COMPANY completed two (2) sub- <br />sidence and slope stability surveys during July, 1991 and Novem- <br />ber, 1991 for the Bear Mine #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 Fasting 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 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 />• <br />