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III IIIIIIIIIIIII III <br />999 <br />~~ Twentymile Coal Company <br />An Atlilliale of <br />Cyprus Yampa Valley Coal CorpaaGOn <br />January 8, 1993 <br />Kent Gorham <br />Reclamation Specialist <br />Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />29515 Roull County Road X27 <br />Oak Creek, CO BO4B7 <br />Phone (303)879-3800 <br />RE: Adequacy Response, Permit Revision 92-2, Southwest Mining <br />District, Permit No. C-82-056 <br />Dear Mr. Gorham: <br />Attached, please find Twentymile Coal Company's responses to the <br />items presented in the Division's letter of December 11, 1992. The <br />format of the response provides the Division's comment followed by <br />Twentymile's response. Likewise, the appropriate materials have <br />been revised and are attached along with a listing of the revised <br />materials. <br />You will note that the bond for sealing the ventilation borehole <br />has been revised to reflect the modified abandonment plan. The <br />worst case option of plugging the hole with cement from bottom to <br />within three feet of the surface was used in the calculation. <br />In reference to Table 60 I will continue to research the files so <br />that this discrepancy can be resolved. I would appreciate any help <br />you might offer on resolving the discrepancy. <br />If there are further questions, <br />convenience. <br />please contact me at your <br />Sincerely, <br />~~~ ~~ <br />Richard Mills <br />Supervisor, Environmental Affairs <br />attachments <br />c: BLM <br />OSM <br />Routt County Clerk and Recorder <br />RECEB~~~= <br />JAN 1 31993 <br />DIVISIQN p= <br />~AIN6BALS 8 GEC "'c;v <br />c~rp~us <br />