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iii iiiiiiiiiiiiiiii sss The Pittsburg & Midway Coal Mining Co. RECEIVED A Chevron Company Edna Mine oCT 3 ~ lye P.O. Box 176, Oak Creek, CO 80467 I ( 3 03) 7 3 6-8111 DiVia~o~ of Minerals 8, Geology Re: West Ridge Hydrologic Plan Progress Report Ms. Susan Burgmaier October 26, 1994 CDMG 1313 Sherman St. Room 215 Denver, CO 80203-2273 Dear Ms. Burgmaier: This letter will serve as a progress report on the Edna Mine's West Ridge Hydrologic Plan. This progress report partially satisfies requirements set forth in Stipulation #31 of the Edna Mine Permit (C-80-001) for yearly reporting, by October 31 of each year, until project completion. This report notes progress through 10/26/94. Work on the project this year includes completion of check dams 20 and 21. This work completed the check dams that will be built in the draw. Two more structures were planned in the original submittal but were removed in a Technical Revision, approved by the Division, that instead called for rocking the flow channel from the outlet of structure number 21 to the inlet of the West Ridge Sediment Pond. This rock work was also completed in 1994. As with the other structures, when a planned terrace was intersected the outlet structure of the terrace was constructed into the draw. As outlined in Appendix 4.6-M of the Permit, we have now completed the second phase of the project which involved construction of the check dams in the draw between Center Ridge and West Ridge. These structures all meet or exceed design criteria set forth in the permit, and a certification to that effect has already been forwarded to your office. This years work, according to the schedule, should also have seen the start of construction on the terraces up dip from the draw. To date only the outlet structures dumping into the draw itself have been constructed. Mine management made the decision to accelerate efforts on final pit grading on the West Ridge area so that the terraces could be completed to the top of the ridge when construction was started. This accelerated grading took the manpower and equipment that would have been used on the terraces. We believe that the terraces can still be completed by the end of the field season in 1995 when the original schedule called for completion of the project.