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PQ~dy <br />Twentymile Coal Company <br />March 22, 2005 <br />Mr. Byron Walker <br />Environmental Protection Specialist <br />Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />(303)866-4941 <br />29515 Routt County Road #27 <br />Oak Creek, CO 80467 <br />970.879.3800 <br />RECEIVED <br />MAR 2 4 2005 <br />Division of Minerals & Geology <br />RE: Foidel Creek Mine (Permit No. C-82-056) -Technical Revisions TR-45, 46, and 47, Additional <br />Documentation <br />Dear Mr. Walker: <br />As indicated in our Technical Revision transmittal dated January 17, 2005, we have been working on <br />specific additional documentation for existing haul roads and water storage features, in order to address your <br />concerns identified during recent field inspections. This has involved research, field surveys, development <br />of design calculations, and prepazation of design documentation and drawings for insertion into the Foidel <br />Creek PAP. With this transmittal, we are pleased to submit design documentation complying with the <br />applicable performance standards of Rule 4.0 for the following existing mine facilities and structures: <br />Mine Haulroads: Access/Haulroad, Haulroads A, B-1, B-2, C, Refuse Haulroad, and Batchweight <br />Loadout Haulroad (TROS-46) <br />Area 1 Pit Temporary Water Storage Basin (TROS-47) <br />Thickener Overflow Sump (TROS-47) <br />The attached Summary of Revisions/Additions identifies the revised and additional materials included in <br />this submittal. We are also working to respond to your Technical Adequacy comments on our previous <br />submittal and to develop the requested supporting documentation, and anticipate submittal of our response <br />package shortly. We appreciate your consideration, cooperation, and assistance in reconciling the existing <br />permit documentation. After you have opportunity to review the accompanying information, please feel <br />free to contact me with any questions or to discuss submittal materials or related matters. <br />Best <br />Supervisor <br />File: G:\Environmental\Revision\Technical Revision\Supplemental Documentarion Cover Letter <br />