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iiiiii i -ii iii iiii <br />blue <br />cb~bon <br />company <br />RECEIVE® <br />MAR 2 31987 <br />MINED LAND <br />RECLAMATION DIVISION <br />blue ribbon coal company <br />p.o. box 1352 <br />palisade, Colorado 81526 <br />(303) 464-7951 <br />March 19, 1987 <br />Susan Mowry <br />Reclamation Specialist <br />Colorado Mined Land Reclamation <br />1313 Sherman Street, Room 423 <br />Denver, CO 80203-2273 <br />RE: Quarterly Bench Stability Monitoring, File #C-047-81 <br />Dear Susan: <br />The first quarter 1987 bench stability survey was taken March 13, <br />1987. Vertical angles were measured with a 20 second theodolite <br />and elevations were calculated with predetermined horizontal distances. <br />A summary of the results of this survey and a comparison with the <br />previous survey is as follows: <br /> 12/04/86 03/13/87 Change <br />5-1 6400.78 6400.75 -0.03 <br />S-2 6395.93 6395.90 -0.03 <br />S-3 6385.59 6385.54 -0.05 <br />S-5 6479.57 6479.53 -0.04 <br />S-6 6480.27 6480.22 -0.05 <br />S-7 6479.06 6479.00 -0.06 <br />5-8 6479.57 6479.50 -0.07 <br />Let me know if there are any questions concerning these numbers. <br />Sincerely, <br />Larry M. Reschke, P.E. <br />Project Engineer <br />LMR:jp <br />