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iii iiiiiiiiiiiiiiii <br />blue <br />cb~bon <br />1 company <br />- ~~s-~ ~, <br />4: 2 ' ~ :~ <br />r,~r~~ 1 s ~9aa <br />Nd1tiEG LAivU <br />I~ECL,p,MA~'10~1 DIVISIOS\1 <br />March 15, 1988 <br />blue ribbon coal company <br />p.o. box 1352 <br />palisade, Colorado 81526 <br />(303) 464-7951 <br />Susan J. Mowry <br />Colorado Mined Land Reclamation Division <br />1313 Sherman Street, Room 423 <br />Denver, Colorado 80203-2273 <br />Re: Quarterly Bench Stability Monitoring, File No. C-81-047 <br />Dear Susan: <br />The first quarter 1988 bench stability survey was taken March 11, 1988. <br />Vertical angles were taken with a 20 second theodolite and elevations were <br />calculated using predetermined horizontal distances. A summary of this survey, <br />the last two surveys and the base line survey is as follows: <br /> 11-20-85 09-24-87 12-23-87 3-11-88 <br />S-1 6400.90 6400.73 6400.70 6400.68 <br />S-2 6396.06 6395.89 6395.89 6395.88 <br />S-3 6385.77 6385.55 6385.55 6385.54 <br />S-5 6479.92 6479.53 6479.54 6479.55 <br />S-6 6480.51 6479.85 6479.83 6479.81 <br />S-7 6479.31 6479.00 6478.99 6478.97 <br />S-8 6479.92 6479.54 6479.50 6479.46 <br />Let me know of there are any questions concerning these numbers. <br />Sincerely, <br />. ~~~ <br />Jim Stover, P.E. <br />Chief Engineer <br />JES:jm <br />