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iiiiiiiiiiuiiuiii <br />999 <br />n~'~on <br />company <br />~~~~~~~ <br />DEC 1 4 1989 <br />tWINEl7 E..i;:~cJ <br />FiECL.F.(iARTIGh' Ot'n ~!~i;J <br />blue ribbon coal company <br />p.o. box 1352 <br />palisade, Colorado 81526 <br />(303) 464-7951 <br />December 11, 1989 <br />Matthew S. Hayes <br />Mined Land Reclamation Division <br />215 Centennial Building <br />1313 Sherman Street <br />Denver, Colorado 80203-2273 <br />Re: Quarterly Bench Stability Monitoring; <br />Permit No. C-81-047 <br />Dear Mr. Hayes: <br />The fourth quarter 1989 bench stability survey was performed <br />December 8, 1989. Vertical angles were measured with a 20 second <br />theodolite and elevations were calculated using predetermined <br />horizontal distances. A summary of this survey, the last two <br />surveys and the 11-20-85 base line survey is as follows: <br /> 11-20-85 06-15-89 09-27-89 12-11-89 <br />S-1 6400.90 6400.69 6400.68 6400.63 <br />S-2 6396.06 6395.94 6395.91 6395.87 <br />S-3 6385.77 6385.60 6385.58 6385.55 <br />S-5 6479.92 6479.59 6479.56 6479.53 <br />S-6 6480.51 6479.91 6479.85 6479.85 <br />S-7 6479.31 6479.08 6479.04 6479.02 <br />S-8 6979.92 6479.58 6479.55 6479.49 <br />Let me know if there are any questions concerning this data. <br />Sincerely, <br />Jim Stover, P.E. <br />Chief Engineer <br />MSH12119 <br />