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J. E. STOVER & ASSOCIATES, INC. <br />P.O. Box 60340 <br />GRAND JUNCTION, COLORADO 81506 <br />PHONE: (970) 245-4101, FAX 242-7908 <br />MINE ENGINEERING <br />MINE RECLAMATION <br />-~ ~ ~~ <br />CIVIL ENGINEERING <br />CONST. MANAGEMENT <br />September 26, 2005 <br />Dan Mathews <br />Division of Minerals and Geology <br />101 South 3rd Suite 301 <br />Grand Junction, CO 81501 <br />RECEIVED <br />OCT 0 4 2005 <br />Re: Cental Appalachia Mining, LLC <br />McClane Canyon Mine <br />Drainage Control Revision <br />Application for a Technical Revision <br />Permit No. C-80-004 <br />Dear Mr. Mathews: <br />plvumn of N~Inerals ana GBOloOY <br />On behalf of Central Appalachia Mining, LLC, enGosed is an application for a technical revision to make minor <br />changes in the drainage control plan shown on Figure 2.2-3. The changes include 1) restoring upper McClane <br />Creek flow to it's original lower segment by installing a culvert at the haul road and 2) plugging culvert "F" and <br />redirecting flow to the sediment pond. <br />1) The frequent high-flow events have caused erosion problems in the lower diverted portion of McClane <br />Creek. This application proposes installing culvert "P" at the haul road as a stabilization measure for the lower <br />diverted portion of McClane Creek. Design of new Culvert "P" is show on Table 4.2-13. <br />2) Culvert "F" has shown to be a high maintenance culvert and as such, this application proposes plugging <br />the culvert and re-directing the flow to the sediment pond. Table 2.2-12 shows the hydrologic parameters & <br />peak flow during mining for each drainage basin. Table 2.2-10 uses information from Table 2.2-12 to show <br />the required runoff and required sediment storage of the sediment pond. The constructed capacities of the <br />pond are shown on Figure 2.2-3. The capacity of the pond is adequate to contain the additional runoff from <br />drainage area D-5. <br />Please callrf you have any questions. <br />Sincerely, <br />'J. E S Gv~~- <br />Consulting Engineer <br />ce: Denver Office <br />BLM -Grand Junction Office <br />Mesa County Clerk & Recorder <br />Enclosures: Pages 2-41, 2-42, M-5 <br />Tables 4.2-10, 4.2-12, 4.2-13 <br />Figure 2.2-3 <br />