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999 <br />blue <br />/ribbon <br />coal <br />company <br />~NR ~ +f~a- ~ ~F/ iiv <br />0 ~ JUN a 11~~9 <br />IyI~fED LAMD <br />R~Ci.AMA i ION D-uISIQ~ <br />blue ribbon coal company <br />p.o. box 1352 <br />palisade, Colorado 81526 <br />(303) 464-7951 <br />June 16, 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-81-097 <br />Dear Mr. Hayes: <br />The second quarter 1989 bench stability survey waa performed June <br />15, 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 12-02-88 03-22-89 06-15-89 <br />S-1 6400.90 6400.68 6400.68 6400.69 <br />S-2 6396.06 6395.92 6395.89 6395.94 <br />S-3 6385.77 6385.60 6385.57 6385.60 <br />S-5 6479.92 6479.59 6479.57 6479.59 <br />S-6 6480.51 6479.89 6479.81 6479.91 <br />S-7 6479.31 6479.05 6478.98 6479.08 <br />S-8 6479.92 6479.56 6479.50 6479.58 <br />Let me know if there are any questions concerning this data. <br />Sincerely,~- <br />lsaJ ~~ts~ ~""-~ <br />Jim Stover, P.E. <br />Chief Engineer <br />MSH6169 <br />