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ENGINEERING & SURVEYING COMPANY <br />~X 674 • 443 DODGE •. DELTA, COLORADO. 81416 303-874-7593 <br />7981-85 <br />S1 ope Stabi.l i ty O ~~,~„~^ <br />August 16, 1985 \\~ <br />Mined Land keclamation AUG 2 ~ ~~a~ <br />423 Centennial Puilding .- <br />1:,13 Sherman Street A(iZ 111C. <br />Denver, Colorado 80203 <br />ATTN: kandall Price <br />RE: Pear Coal Company Slope Stability Monitoring, <br />bear Mine No. 2 <br />Rear Mine No. 3 <br />We completed monitoring of the three stations on Pear No. 2 <br />with the following results:. <br />Station X <br />• U-13' 4388.564 <br />U-14 4480.649 <br />U-15 4476.467 <br />Y <br />3504.810 <br />3610.149 <br />3894.999 <br />Z <br />6115.506 <br />6087.900 <br />6104.246 <br />Deviation from the 1984 readings are: <br />Station Horiz. Vert. <br />U-13 0.315 0.514 <br />U-14 0.610 0.150 <br />U-15 0.742: 0.254 <br />kegarding the above deviations. we monitored this year with a <br />mare experienced crew and different equipment than was used <br />last year. We feel most of the discrepancies can be <br />accounted for in quality of field work and accuracy of <br />equipment. This is only the second year these stations have <br />been monitored. Accumulation of data will furnish a better <br />base on which -to detect movement. <br />Stations U-13, U-14 and U-15 have been replaced with new <br />monuments consisting of 3-inch diameter steel pipes with a-;4- <br />inch square top and a 5/8-inch bolt. These new monuments <br />will 6e used for all subsequent slope stability monitoring on <br />• Bear Mine No. 2.. The stations and coordinates are as <br />follows: <br />