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M= N R E C, I N C. <br />743 HORIZON COURT, SUITH 205 <br />GRAND JUNCTION, Ca 81506 <br />THLHPHONS (303) 245-4101 <br />BLUR RIBBON MINH <br />III IIIIIIIIIIIIIIII <br />«vclV~® <br />SEP 2 0 1990 <br />Mined Land <br />Reclamation Division <br />September 18, 1990 <br />S. J. McCannon <br />Mined Land Reclamation Division <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />Re: Quarterly Bench S_tabil-ity Monitoring;- - --- -- <br />Permit No. C-81-047 <br />Dear Ms. McCannon: <br />The third quarter 1990 bench stability survey was performed <br />September 14, 1990. Vertical angles were measured with a 20 <br />second theodolite and elevations were calculated using predeter- <br />mined horizontal distances. A summary of this survey, the last <br />two surveys and the 11-20-85 base line survey is as follows: <br /> 11-20-85 03-18-90 06-15-90 09-14-90 <br />S-1 6400.90 6400.63 6400.65 6400.65 <br />S-2 6396.06 6395.87 6395.89 6395.90 <br />S-3 6385.77 6385.55 6385.57 6385.57 <br />S-5 6479.92 6479.52 6479.54 6479.57 <br />S-6 6480.51 6479.83 6479.86 6479.89 <br />S-7 6479.31 6479.00 6479.02 6479.04 <br />S-8 6479.92 6479.51 6479.53 6479.54 <br />Let me know if there are any questions concerning this data. <br />Sincerely, <br />~'~ ~JJ <br />Jim Stover, P.E. <br />Chief Engineer <br />SM091890 <br />