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III IIIIIIIIIIIII III <br />STATE OF COLORADO <br />DIVISION OE MINERALS AND GEOLOGY <br />Depanmem of Natural Resources <br />I J I J Sherman 51., Room 215 Ilq` <br />Denvcr, Culorado 80203 I III, <br />Phune: (303) A66 3567 <br />FAX: (3031 8 3 2-81 06 <br />DEPARTMENT OF <br />September 29, 1995 NATURAL <br />• RESOURCES <br /> Roy Romer <br />Michael G. Altavilla c°"°`"°` <br />Engineering Manager lame>S. Lochhead <br />Seneca Coal Company E`e`°~~"eD're`~°, <br />P.O. Drawer D "~"n1P~ R. `°°h <br />Divivon Duxmr <br />Hayden, Colorado 81639 <br />RE: Seneca II-W Mine (C-82-057) <br />Minor Revision 37 <br />Dear Mr. Altavilla: <br />Enclosed please find the decision form for the above mentioned revision. Along with this <br />approval, the Division would like to make clear what activities are being approved in this minor <br />revision, and what activities must wait for approval of Technical Revision 24. <br />1. The Division is allowing SCC to strip topsoil from and mine an additional 34.2 acres of <br />disturbed area not currently within the five year disturbance boundary. This area is <br />shown on the portion of Exhibit 20-1 submitted with the revision application. The <br />Division finds that the additional disturbance area will be effectively treated by Pond 006, <br />and that the existing performance bond is adequate to ensure reclamation of the <br />additional disturbed area. <br />2. SCC must ensure that runoff from this additional disturbance is directed to Pond 006, <br />without causing erosion of undisturbed areas and subsequent topsoil loss. <br />3. SCC may not construct the clean water diversion ditch proposed in Technical Revision <br />24 until final approval by the Division has been granted. <br />4. SCC may not alter the primary spillway of Pond 006, as proposed in Technical Revision <br />24, until final approval by the Division has been granted. <br />If you or your staff have questions or need additional information, please contact me. <br />Sincerely, <br />O ws <br />Susan L Burg ier <br />Environmental Protection Specialist <br />Enclosure <br />SLB\092995.WP <br />