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;- <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />1 J 13 Sherman SL, Room 215 <br />Denver, CO 80201 <br />Phone: 13031 86h 3567 <br />FAx: 1303) 8328106 <br />August 17, 1993 <br />David L. Beverlin <br />Edna Strip Mine <br />Pittsburg & Midway Coal Mining Company <br />P.O. Box 176 <br />Oak Creek, Colorado 80467 <br />RE: Edna Strip Mine (C-80-001) <br />Technical Revision 25 <br />Dear Mr. Beverlin: <br />III IIIIIIIIIIIII III <br />999 <br />STATE OF COLORADO <br />of cow <br />R~ r <br />„° s ": O <br />~ !a J-r1 M1l <br />.y~~/~. <br />r <br />~ /B]6 <br />Ruy Rnmei <br />Gnvernur <br />Michael 8. Lunq <br />Drvisiun Ducclor <br />We have completed a preliminary adequacy review of materials submitted with your application <br />for the above mentioned technical revision. We have the following questions, comments, and <br />concerns with the revision. <br />1. We are unable to determine the location of the siphon tube in the sedimentation pond <br />embankment. Please include the location of this structure in Exhibit 4.6-7 (Plan View) <br />and Exhibit 4.6-8 (Cross Section). <br />2. What is the construction of the fined siphon tube that functions as the primary spillway <br />for the facilities sedimentation pond? <br />3. Exhibit 4.6-6, "Facilities Drainage Control Structure Locations", shows a watershed <br />boundary on the east side of the facilities area yard. What topographic feature exists <br />to delineate that boundary? <br />4. On the same exhibit, what topographic feature delineates the watershed boundary on <br />the south and west sides of the equipment maintenance building? <br />5. What controls runoff and sedimentation on the south end of the facilities pad where the <br />bone yard is located? <br />