1987-02-25_REVISION - C1981012 (2)

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:, Richard D. Lamm Governor DEPARTMENT OF NATURAL RESOURCES David H. Getches, Executive Director MINED LAND RECLAMATION DI\ DAVID C. SNELTON, DlreMor January 9, 1987 David Stout Environmental Coordinator Wyoming Fuel Company 12055 W. 2nd Place P, O. Box 15596 Lakewood, Colorado 80215 Re: New Elk Mine - File No. C-81-012, - Technical Revision No. 7 Pond 006 Overflow Pipe and Technical Revision No. 10 Sewage Treatment Facility Dear Mr. Stout: The most recent material submitted in regard to the above revisions has been reviewed. As for Technical Revision (TR) No. 7, the Environmental Protection Agency revision to their rules to allow prep plant discharge renders an emergency spillway for Pond 006 acceptable. The design for Pond 006 recently included in Exhibit 19 of the permit application, however, shows the spillway elevation at 7,388 feet or 2.2 acre-feet capacity. The thickener volume is stated to be 704,973 gallons or 2.16 acre-feet. With the spillway at this level, one foot of freeboard is not maintained. An acceptable design must incorporate one foot of freeboard above the 2,16 acre-feet level and one foot below the base of the emergency spillway. Exhibit 19 also does not contain size requirements for or dimensions for the emergency spillway. A copy of the NPDES Permit allowing discharge of prep plant water from the pond is also required. As for TR 10, the sewage facility design is acceptable. A copy of the NPDES Permit allowing discharge of sewage water from Pond 006 is required. It is strongly recommended that in the event sewage water is discharged to Pond 006, Wyoming Fuel Company commit to not recirculating water from the pond into the prep plant until it meets effluent limits applicable to sewage discharge. Sincerely, '~~/ ~~_ James C. Stevens Reclamation Specialist JCS/srs 6628E 423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (303) 866-3567