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blue <br />~~on <br />company <br />R~~~o~~® <br />0 C 7 1 01989 <br />MIfYi:t} l.."i. ~.~ <br />RECLAMAT!Or- ,.;r,,~g~~j;d <br />iii-ii -i uiiiiii <br />blue ribbon coal company <br />p.o. box 1352 <br />palisade, Colorado 81526 <br />(303) 464-7951 <br />September 6, 1989 <br />Mattheca 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 third quarter 1989 bench stability survey was performed Sep- <br />tember 27, 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 surve,v is as follows: <br /> 11-20-85 03-22-89 06-15-89 09-27-89 <br />S-1 6400.90 6400.68 6400.69 6400.68 <br />S-2 6396.06 6395.89 6395.94 6395.91 <br />S-3 6385.77 6385.57 6385.60 6385.58 <br />S-5 6479.92 6479.57 6479.59 6479.56 <br />S-6 6480.51 6479.81 6479.91 6479.85 <br />S-7 6479.31 6478.98 6479.08 6479.09 <br />S-8 6479.92 6479.50 6479.58 6479.55 <br />Let me know if there are any questions concerning this data. <br />Sincerely, <br />~hC~~~ <br />Jim Stover, P.E. <br />Chief Engineer <br />MSF110069 <br />