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• • III IIIIIIIIIIIII III <br /> STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Depanment of Natural Resources <br />1313 Sherman St., Ronm 215 `y <br /> <br />Denver, Colorado 80203 I <br />~~ <br /> <br />Phone:1303) 866-3567 II <br />fAx: (3031 832-8106 <br /> DEPARTMEIJT OF <br /> NATURAL <br />December 1, 199a RESOURCES <br />Mr. Joseph Welte "ur Romer <br /> <br />Summit Brick & Tile Co Governor <br />. lames. ~o<nneaa <br />13th & Erie EeecWive Direclo~ <br />o <br />Pueblo, CO 01001 Micnae~ R. Lung <br /> Division Direcmr <br />RE: 8 Mile Clay Pit - Iiighwall Stability, Permit No. M-77-320 <br />Dear Mr. Welte: <br />I have reviewed the stability analysis prepared by Lincoln-Devore, Inc. for existing and <br />proposed highwall conditions at the 8-Mile Clay Mine. The stability analysis demonstrates <br />that a factor of safety in excess of 3.4, which is mote than adequate, will be met under both <br />conditions. As such, we eliminate the current stipulation that all exposed highwalls should <br />be no more than 30 feet in height. <br />We recommend, however, that the current benching technique be continued in order to <br />maintain highwalls of less than 40 feet. This will enhance the feasibility of highwall <br />reclamation to a condition similar to that of the unpermitted pre-law area. <br />Please call me at 866-3567 if you have any questions. <br />Sincerely, <br />Thomas A. Schreiner~~~~ <br />Environmental Protection Specialist <br />cc: Jim Stevens, DMG <br />Lloyd V. Barnhart, Barnhart Agency, Inc. <br />M:loss~lw~lm.v: <br />