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.~ <br />iii iiiiiiiiiiiii iii <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Dcpanmenl o(Natural Resources <br />1 31 S Sherman St.. Room 215 ~ <br />rr <br /> <br />Denver, Colorado 811 ?03 I <br />~~ <br /> <br />Phunc 17031 8663567 II <br />FAX' 130]1 83?-8106 <br /> DEPARTMENT OF <br /> NATURAL <br />August 15, 1997 RESOURCES <br />Ms <br />Christine Johnston Roy Romer <br />. Governor <br />Mountain Coal Company lames 5. Lochhead <br />P.O. Box 591 Eiecmioe Director <br /> <br />Somerset, Colorado 81434 Michael B Long <br />oivl:inn oireunr <br />Re: West Elk Mine (Permit No. C-80-007) <br />Deaz Ms. Johnston: <br />During our recent review of MCC's applications for Minor Revision Nos. 219 and 220, DMG <br />became aware of apparent oversights in the West Elk Mine permit application. The problems aze <br />as follows: <br />There is an appazent error in the SEDCAD runs for the pond SG-1 drainage area. Culvert <br />CCW-1B is shown, on Maps 1 E and 3E of Exhibit 66, to receive drainage from watershed <br />43 via ditch DSLY-9. At this point, discharge would be 156.85 CFS. The dischazge amount <br />used to size the culvert is based on flow to the culvert prior to the addition of DSLY-9, or <br />127.42 CFS. Accordingly MCC has determined that aCCW-1B should have a minimum <br />diameter of 48" . DMG ran the culvert calculation using the 156.85 CFS figure, and <br />determined that the minimum size should be 54". Our design run is enclosed. Please revise <br />the design for the culvert accordingly. A revision for this design should be received within <br />two weeks of this letter. Since the Shafr #1 and #2 bench is currently being constructed, <br />MCC should immediately ensure that the culvert installed is a minimum 54" diameter. <br />Topsoil stockpile #4, listed on Table 36A, is not on the referenced Map 53B. Dependant on <br />whether or not the stockpile was or will be constructed, it should either be removed from <br />Table 36A, or added to Map 53B, whichever is appropriate. This should be corrected the <br />next time Table 36A or Map 53B are revised. <br />Topsoil stockpile #6, shown on Map 53B, is not listed on Table 36A. This should be <br />corrected the next time Table 36A is revised. <br />4. The topsoil stockpiles listed on Table 36 are not labeled on the referenced maps. This <br />should be corrected the next time the maps are revised. <br />Should you have questions or need additional information, please contact me. <br />Sincerely, <br />n/l ul~P6 f <br />Michael P. Boulay <br />Environmental Protection Specialist <br />Enclosure <br />WELtiMISC.WPW <br />