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M S N R E C, I N C. <br />743 HGY2I20N COURT, SUITE 205 <br />(;RAPID JUNCTION, CO 81506 <br />TELEPHONE (303) 245-4101 <br />BLUE RIBBON MINE <br />III IIIIIIIIIIIIIIII <br />~~~%~~VED <br />APR081991 <br />iVl'ned Land <br />Reclamation Division <br />April 6, 1991 <br />J. J. Dudash <br />Mined Land Reclamation Division <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />Re:--Quarter3y Bench Stability Monitoring; <br />Permit No. C-81-047 <br />Dear Ms. McCannon: <br />The first quarter 1991 bench stability survey was performed <br />April 4, 1991. 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 09-14-90 11-16-90 04-04-91 <br />S-1 6400.90 6400.65 6400.62 6400.64 <br />S-2 6396.06 6395.90 6395.87 6395.86 <br />S-3 6385.77 6385.57 6385.55 6385.58 <br />S-5 6479.92 6479.57 6479.53 6479.53 <br />S-6 6480.51 6479.89 6479.85 6479.83 <br />S-7 6479.31 6479.04 6479.04 6479.02 <br />S'-8 6479.92 6479.54 6479.53 6479.55 <br />Let me know if there are any questions concerning this data. <br />Sincerely, <br />'ur~ <br />Jim Stover, P.E. <br />Chief Engineer <br />BENMON <br />