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III IIIIIIIIIIIIIIII <br />999 <br />blue <br />ribbon <br />'` cool <br />company <br />blue ribbon coal company <br />p.o. box 1352 <br />palisade, Colorado 81526 <br />(303) 464-7951 <br />February 9, 1989 <br />,r ___1 <br />is ~~ ~ ice. I ~I!'-i 1~ <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 />FEB ? 31999 <br />REG! l;.A<~ ~ IOr: Uf`J19!Ql~l <br />The fourth quarter 1988 bench stability survey was performed <br />December 2, 1988. 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 06-24-88 09-20-88 12-02-88 <br />S-1 6400,90 6400.71 6400.70 6400.68 <br />S-2 6396.06 6395.95 6395.93 6395.92 <br />S-3 6385.77 6385.58 6385.61 6385.60 <br />S-5 6479.92 6479.61 6479.58 6479.59 <br />S-6 6480.51 6479.88 6479.93 6479.89 <br />S-7 6479.31 6479.09 6479.08 6479.05 <br />S-8 6479.92 6479.60 6479.57 6479.56 <br />Let me know if there are any questions concerning this data. <br />Sincerely, <br />a+w <br />Jim Stover, P.E. <br />Chief Engineer <br />