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The Pittsburg & Midway Coal Mining Co. <br />A Chevron Company <br />6400 Souih Fdtller's Green Circle, Englewood, C080111-0991 <br />Mail Address: P.O. Box 6518, Englewood, CO80155-6518 ~ FAK (303 9304204 • Phme (303)930.3600 <br />CERTIFIED RECEIPT P 919 036 075 <br />Ms. Susan L. Burgmaier <br />Colorado Division of Minerals and Geology <br />1313 Sherman Street, Rm # 215 <br />Denver, CO 80203 <br />Dear Ms. Burgmaier: <br />Apri17, 1994 <br />iiiiiiiuiiiiiuiii <br />999 <br />Permit C-80-001 <br />nic 1 i i <br />=c~rv~~ <br />APR p 71994 <br />-ti <br />Enclosed are three (3) copies of a Technical Revision to the above referenced permit. This revision <br />is 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 Forrn 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 4.6-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 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 />Sincerely, <br />~~~~~ <br />Brian D. Gontarek <br />Environmental Engineer <br />Enclosures <br />cc: David Beverlin -Edna Mine <br />