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blue <br />ribbon <br />coal <br />company <br />iiiiiiiiiiiuiuiii <br />blue ribbon coal company <br />p.o. box 1352 <br />palisade, Colorado 81526 <br />(3031464-7951 <br />June 28, 1988 <br />Susan J. Mowry <br />Mined Land Reclamation Division <br />423 Centennial Building <br />1313 Sherman Street <br />Denver, CO 80203-2273 <br />Re: Quarterly Bench Stability Monitoring <br />Permit No. C-81-047 <br />Dear Susan: <br />The second quarter 1988 bench stability survey was taken June 24, <br />1988. Vertical angles were taken with a 20 second theodolite and <br />elevations were calculated using predetermined horizontal dis- <br />tances. A summary of this survey, the last two surveys and the <br />base line survey is as follows: <br /> 11-20-85 12-23-87 3-11-88 6-24-88 <br />S-1 6400.90 6400.70 6400.68 6400.71 <br />S-2 6396.06 6395.89 6395.88 6395.95 <br />S-3 6385.77 6385.55 6385.54 6385.58 <br />S-5 6479.92 6479.54 6479.55 6479.61 <br />S-6 6480.51 6479.83 6479.81 6479.88 <br />S-7 6479.31 6478.99 6478.97 6479.09 <br />S-8 6479.92 6479.50 6479.46 6479.60 <br />Let me know if there are any questions concerning these numbers. <br />Sincerely, <br />Jim Stover, P.E. <br />Chief Engineer <br />JES:tds <br /> <br />Jl1L 11988 <br />MIfdED LAhlO <br />~iECLAMATION DIVIBIOhI <br />