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M S N R E C, I N C. <br />743 HORIZON OOllKf, SUITE 205 <br />Qt4ND JUNCTION, CO 81506 <br />TELEPHONE (303) 245-4101 <br />BLUE RIBBON MINE <br />III IIIIIIIIIIIII III <br />JUN 2 0 195 <br />`~~C!.• ~AATD L4PJG <br />OA1 rlnii~• ; J <br />June 15, 1990 <br />Matthew S. Hayes <br />Mined Land Reclamation Division <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />Re: Quarterly Bench Stability Monitoring; <br />Permit No. C-81-047 <br />Dear Mr. Haves: <br />The second quarter 1990 bench stability survey was performed June <br />15, 1990. 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 12-11-89 03-18-90 06-15-90 <br />S-1 6400.90 6400.63 6400.63 6400.65 <br />S-2 6396.06 6395.87 6395.87 6395.89 <br />S-3 6385.77 6385.55 6385.55 6385.57 <br />S-5 6479.92 6479.53 6479.52 6479.54 <br />S-6 6480.51 6479.85 6479.83 6479.86 <br />S-7 6479.31 6479.02 6479.00 6979.02 <br />S-8 6479.92 6979.49 6479.51 6479.53 <br />Let me know if there are any questions concerning this data. <br />Sincerely, <br />Lwr/ <br />Jim Stover, P.E. <br />Chief Engineer <br />MHU61590 <br />