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-_~-ya ~ ._....;1 ' :~•~' ~ -'- ; ENGINEERING & SURVEYING COMPANY BOX 674 • 443 DODGE • DELTA, COLORADO 81416 • 303-874.7593 _ ..._. ~._ .-r~.__._ ~~ ...._:S-~ .. 7881-87 Subsidence and Slope Stability March 1', 1987 Mined Land Reclamation 42v Centennial Building 131 Sherman Street Denver, Colorado 811203 t~AR 191987 MINT ON pD IS-ON CIECLAMA Attention: Brent Anderson Re: Bear Coal Company Bear Mine No. Bear Mine No. Somerset, Colorado UTE ENGINEERING AND SURVEYING COMF'AIVY completed two subsidence and slope stability surveys during 1986 for the Bear Mine #3 and the Old Bear Mine #2. Subsidence monitoring was also conducted on a wee{;ly basis aver the active mining area during the month of June, and monthly for July through November. Na movement was detected, ~=o the frequent monitoring was terminated. These surveys are based on ~ control moni.lments located across the canyon an the Kaiser Coal Company (Formerly U. S. Steel), that have been in place for several years. In 1984, two new monuments were set by UTE ENGINEERING AND SURVEYING COMPANY adjacent to the two e::isting monuments. The new monuments are referred to as D- 11-U and D-12-U. See Map for location. The new monuments are ~- inch pipe with a 4-inch plate so the elevation will be fi>:ed for each reading. The coordinates of the new monuments are: Northing D-11-U 405,065.78 D-12-U 405,418."2 Fasting Elevation 1,440,544.57 6185.92 1,441,625.51 6195.50 These coordinates and elevations will remain fi>:ed and all other points will be relative to them. We have developed a sequence for the surveys that divides the • stations into primatry control loops, secondary control loops and points tied by sideshot (triangulation) only. All stations are =" diameter steel pipe described in our report dated August 10, 1985 unless noted otherwise.