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III IIIIIIIIIIIII III ~~ `~ <br />blue <br />cb~bon <br />company <br />December 9, 1986 <br />Susan Mowry <br />Reclamation Specialist <br />Colorado Mined Land Reclamation <br />1313 Sherman Street, Room 423 <br />Denver, Colorado 80203-2273 <br />Re: Quarterly Bench Stability Monitoring <br />File #C-047-81 <br />Dear Susan: <br />blue ribbon coal company <br />p.o. box 1352 <br />palisade, Colorado 81526 <br />(303) 464-7951 <br />~C~m~C.~-t1~~~ <br />DEC 121986 <br />KINEi7 S Ah:'7 <br />REG! AtdATi;:F! ~i',~;~IJN <br />The fourth quarter 1986 bench stability survey was taken December 4, 1986. <br />Vertical angles were taken with a theodolite and calculations were done using <br />a predetermined horizontal distance. A summary of the results of this survey <br />and a comparison with the previous survey is as follows: <br /> 1013/86 12/4/86 Change <br />S-1 6,400.80 6,400.78 -0.02 <br />S-2 6,395.95 6,395.93 -0.02 <br />S-3 6,385.62 6,385.59 -0.03 <br />S-5 6,479.61 6,479.57 -0.04 <br />S-6 6,480.32 6,480.27 -0.05 <br />S-7 6,479.08 6,479.06 -0.02 <br />S-8 6,479.58 6,479.57 -0.01 <br />Let me know if there are any questions concerning these results. <br />Sincerely, <br />Larry<'M. Reschke <br />Project Engineer <br />LMR/clt <br />