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iii iiiiiiiiiiiiiiii, <br />999 <br />STATE OF COLOI~DO <br />DIVISION OF MINERALS AND GEOLOGY <br />Deparunent of Natural Resources <br />1317 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />Phone: (3011 866-35 6 7 <br />FAA: (303) 832-8106 <br />Interoffice MEMORANDUM <br />~~~ <br />~~ <br />DIVISION O F <br />MINERALSi <br />GEOLOGYI <br />RECLAMATION <br />MINING•SAFETY <br />JAN 0 7 pOp~ <br />~ivisiar u ~elr9r0~~ <br />to: Dan Mathews <br />from: Byron G. Walker"`f^v <br />subject: Request for Suppor(, Munger Canyon Mine Portal <br />81-020 <br />date: December 31, 2001 <br />Bill O~~enc <br />Governor <br />Greg E. Watcher <br />E,or Mice Dtrfctur <br />Backfill Certification Perrrµ(c(„~B Long <br />Dielsiun Dvec ror <br />Given the configuration, I concur with Mr. Stover that [he evaluation confirms that the final <br />backfill configurntion will be stable with the additional coal materials recently placed on the <br />bench. I find the engineering analysis properly accomplished with material strength parameters <br />appropriate to the site. <br />No site visit was made to confirm the configuration information provided. This concurrence is <br />based on a review of the stability analysis provided by Mr. Stover. The items reviewed consisted <br />of the information provided under J. E. Stover & Associates letter of November 29, 2001 Re: <br />Lodestar Energy, Inc. Munger Canyon Mine Mine Portal Backfill Certification Permit C-81-020, <br />and J.E. Stover & Associates letter of December 21. 3001, same subject (both of these letter are <br />returned as attachments). <br />Please call me if you have any questions. <br />2 Enclosures as stated <br />Cc: Sandy Brown (w!o encl) <br />Dan Hernandez (w/o encl) <br />Files: C:\WPDOCS\Support\miscellaneousVvlunger slope stability.doc <br />