1985-06-14_REVISION - C1981012 (3)

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R~chartl D. Lamm Governor DEPARTMENT OF NATURAL RESOURCES David H. Getches, Executive Director MINED LAND RECLAMATION DI\ DAVID C. SNELTON, Dlreetor DATE: June 14, 1985 T0: Jeff Deckler FROM: Candy Thompson RE: Wyoming Fuels Technical Revisions to Modify Ponds 006 and 007 - Adequacy Comments The following are adequacy issues I have identified: 1. Maps must be submitted showing the revised drainage plan with locations of sub-drainage areas used to determine sediment yield; 2. Input used to derive the volume and peak flow resulting from the 10 year, 24 hour event must be submitted; • 3. The emergency spillways must be capable of passing the 25 year, 24 hour peak flow as required by Rule 4.05.6(3)(d); 4. Stage-storage curves should be submitted for pond 006; 5. Elevations of all discharge structures including dewatering orifices must be submitted; 6. Sewage treatment plant water inflow into pond 007 can not be approved unless the volume of discharge is known and the pond appropriately sized; 7. Pond 006 is not now large enough to handle the volume projected by Wyoming Fuels. This discrepancy needs to be fully addressed, including detailed designs for pond reconstruction; 8. The Water, Waste, and Land study was directed at the old 30 year old refuse that has undergone weathering and leaching through the years. It is not applicable to the material processed though the thickener. The properties and therefore environmental concerns resulting from this material are not known. Wyoming fuel must fully address the chemical properties of the material. In light of the location of Pond 006 on alluvium, the need for lining of the pond to protect the alluvial and stream water quality should be addressed. CMT/ddt . 1315E 423 Centennial Building, 1373 Sherman Street Denver, Colorado 80203 Tel. (303) 866-3567 III IIIIIIIIIIIIIIII 999