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CCkiYrtn farl~C <br />~`' y III IIIIIIIIIIIII III <br />999 <br />• Cyprus Yampa Valley l.uai w~µn mwii <br />C c,~,RU ~+ 29587 Routt County Road #27 <br />~ Vii'" r7 Oak Creek, Colorado 80467 <br />~ Yampa Valley 303-879800 <br />July 7, 1993 <br />RF~'.EIVED <br />~uj_ 0 81993 <br />Kent Gorham <br />Reclamation Specialist ;;;~:;.a~ ~: ~.~~r~eials S Geology <br />Division of Minerals and Geology <br />1313 Sherman Street, Room 21 5 <br />Denver, CO 80203 <br />RE: Permit C-81-071. Technical Revision 93-35. Repair of PG 61-1a (lower seamentl <br />Dear Mr. Gorham: <br />Enclosed, please find the corrected materials per our previous telephone conversation for <br />the referenced technical revision. As discussed, the conveyance capacity calculation for <br />the existing ditch configuration was in error and has been corrected. In addition, the <br />enclosed reference map which reflects the current post-mining topography and permanent <br />drainageway locations has been included. The permanent drainageways and watershed <br />area contributing to the area in question have been highlighted for your reference. <br />I apologize for my oversight in not including the reference map used in generating the <br />SedCad sizing calculations for the ditch segment to be repaired, and hope that this has not <br />caused a major inconvenience. <br />If you have any questions, please feel free to contact me at your convenience. <br />Sincerely, <br />~~- <br />Marcus A. Middleton <br />Environmental Specialist <br />MAM:js <br />Enclosures <br />cc: Clerk and Recorder <br />