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S <br />blue <br />coon <br />company <br />September 28, 1987 <br />Susan J, Mowry <br />Colorado Mined Land Reclamation <br />1313 Sherman Street, Room 423 <br />Denver, CO 80203-2273 <br />Re: Quarterly Bench Stability Monitoring, File No. C-047-81 <br />Dear Susan: <br />III IIIIIIIIIIIII III <br />999 <br />blue ribbon coal company <br />p.o. box 1352 <br />palisade, Colorado 81526 <br />(303) 464-7951 <br />The third quarter bench stability survey was taken September 24, 1987. <br />Vertical angles were measured with a 20 second theodolite and elevators were <br />calculated using predetermined horizontal distances. A summary of results <br />of this survey, the last survey and the base line survey is as follows: <br />11/22/85 <br />07/09/87 <br />09/24/87 <br />S-1 6400.90 6400.77 6400.73 <br />S-2 6396.06 6395.94 6395.89 <br />5-3 6385.77 6385.61 6385.55 <br />S-5 6479.92 6479.58 6479.53 <br />S-6 6480.51 6479.92 6479.85 <br />S-7 6479.31 6479.07 6479.00 <br />S-8 6479.92 6479.56 6479.54 <br />The elevations from this survey are within the range of other recent surveys. <br />Sincerely, <br />t _, <br />Larry 4, Reschke, P.E. <br />Project Engineer <br />LMR:ver <br />r~i~~~1~,~p~E <br />S~ P 3 01987 <br />s.: .._...:. <br />