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postmining topography in accordance with Map 19 <br />HYDROLOGY ISSUES <br />As we discussed, changes to the postmining topography will affect minor portions of two <br />permanent, riprap lined ditches, namely the West Pit Fill Ditch from approximately Station 32 to <br />60 and the Taylor Tributary Ditch from approximately Station 0 to 15. <br />West Pit Fill Ditch Sta. 32 to 69 <br />The reconfiguration of the postmining topography results in a slight rerouting and steepening <br />(up to 20%) of a small segment of the ditch. The enclosed SEDCAD utility run pages and <br />revised summary table should replace the like page which are both found in Volume 2D, Exhibit <br />7, Hydrology Information. Leave the SEDCAD run and other information in this section intact. <br />Tavlor Tributary Ditch Sta. 0 to 65 and Sta. 65 to 108 <br />The reconfiguration of the postmining topography results in steepening (up to 25%) the initial <br />segment of the ditch. An additional enclosed SEDCAD utility run pages and revised summary <br />table should replace the like page which are both found in Volume 2D, Exhibit 7, Hydrology <br />Information. Leave the SEDCAD run and other information in this section intact. <br />Also enclosed, please find revised Drawing 12 -Hydrology, Drawing No.33A - Postmining <br />Permanent Drainage Profiles and Drawing No. 41 -Watershed Boundaries for Hydrologic <br />Modeling which will replace the same drawings found in Volumes 7, 9 and 10 respectively. <br />BONDING ISSUES <br />The Division had requested that Colowyo review the Reclamation Performance Bond to <br />determine whether any changes were necessary. The entire area affected by this revision is <br />either covered by the West Pit Area Disturbance bond scenario or the Facilities Disturbance <br />Area bond scenario. As such, there are no gaps in bond coverage in the areas affected by this <br />revision and no additional unbonded acreage will be effected. Our conclusion is that no <br />Reclamation Performance Bond changes are necessary for this postmining topography <br />modification. <br />Colowyo has also attached a copy of a proposed Public Notice for TR-48 which will be <br />published upon notification from the Division that this TR Application is complete. <br />Colowyo would be pleased to discuss the proposal with the Division at your convenience should <br />you so desire. <br />Sincerely <br />~~-~/ i/yf'c~,e Fret <br />James A. Kiger <br />Attachments: <br />xc: M. Gibson <br />S. Hinkemeyer <br />Moffat County Clerk and Recorder <br />USDI, BLM, Little Snake Resource Area <br />files <br />