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The Pittsburg & Midway Coal Mining Co, <br />A Chevron Company <br />6400 South Fddler's Green Circle, Englewood, CO 801114991 <br />Mail Address: P.O. Bar 6518, Englexvorl. CO BOfSS-6518 ~ FA7(13031936-0204 • Phone 1~3193P3600 <br />April 14, 1994 <br />Permit C-80-001 <br />Technical Revision 29 <br />CERTIFIED MAIL RECEIPT' P 244 617 21 1 <br />Mr. Rick Holbrook <br />OSMRE - Western Service Center <br />Brooks Towers <br />1020 15th Street <br />Denver, CO 80203 <br />Dear Mr. Holbrook: <br />Enclosed is one copy of a Technical Revision to the above referenced permit. This revision is <br />being submitted in order to eliminate check dams 22 and 23 from the original West Ridge <br />Hydrologic Reconstruction Plan. <br />The following materials are being provided under this cover letter: <br />Application Form for a Revision to a Coal Mining and Reclamation Permit; <br />Proposed Public Notice; <br />Revised Appendix 4.6-M, except for Figures 4.6-M1 and 4.6-M2, and; <br />Revised Exhibit 4.6-M2. <br />The permit material provided herein contains a complete set of the text portion of Appendix 4.6-M. <br />The majority of the submitted material is provided for pagination purposes. <br />A concern has been expressed by the CDMG regarding the size and stability (during peak flow) of <br />the channel section from Check Dam 21 to the Center Ridge Pond. Since this channel segment is <br />naturally occurring and all modifications to the channel segment wen; made prior to the passage of <br />SMCRA, no detailed engineering designs of the channel were made. However, in order to ensure <br />that the channel is sufficient in size and configuration, a SEDCAD+ run of the existing channel at <br />its narrowest point is attached to this cover letter to demonstrate that the channel will safely pass the <br />peak flow from the 100-yr, 24-hr precipitation event <br />Should you have any questions or require additional information regarding the enclosed <br />information or the permit revision, please contact David Beverlin at the Edna Mine at your earliest <br />convenience. <br />Sincerely, <br />~~~ <br />Brian D. Gontarek <br />Environmental Engineer <br />Enclosure <br />