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The Pittsburg & Midway Coal Mining Co. <br />A Chevron Company <br />6400 Souih Fddler's Green Circle, Englewood, CO 60111991 <br />flail AdGress: P.O. eax 6518. Fnglexaod, CO BO159b519 ~ FAX (363193042(14 ~ Phone (36319Y}3fi06 <br />April l4, 1994 <br />Permit C-80-001 <br />Technical Revision 29 <br />CERTIFIED MAIL RECEIPT P 244 617 210 <br />Mr. Robert Hagen <br />OSMRE Albuquerque Field Office <br />505 Marquette N.W., Suite 1200 <br />Albuquerque, NM 87102 <br />Dear Mr. Hagen: <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 />1. Application Form for a Revision to a Coal Mining and Reclamation Permit; <br />2. Proposed Public Notice; <br />3. Revised Appendix 4.6-M, except for Figures 4.6-M 1 and 4.6-M2, and; <br />4. Revised Exhibit 4.6-M2. <br />The permit material provided herein contains a complete set of the text portion of Appendix 4.CrM. <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 were 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 />Sinc''erel~y, ~ <br />~_, ~~_ <br />Brian D. Gontarek <br />Environmental Engineer <br />Enclosutrs <br />