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Mr. Allen S. Weaver -4- April 18, 1994 Energy Fuels Mining Company over the reclaimed refuse pile. If the diversions are to be removed, please provide the designs for the channels that will be reconstructed on the reclaimed slopes that will convey the runoff from the natural drainages above the refuse pile in a stable manner (Rule 4.05.4(4)). 17. Rule 4.05.2(21: This rule states, "Sedimentation ponds and treatment facilities for surface drainage from the disturbed area shall be maintained until removal is authorized by the Division..." Please describe how cleanings from the sediment pond and catchment basins will be disposed of now that the refuse pile is to be reclaimed. 18. Rule 4.05.2(31: Please discuss whether the trailer SAE is planned for reclamation as part of Reclamation Project 2. If so,. plans for treatment of the runoff from the reclaimed SAE area should be submitted. These plans would need to be designed such that the runoff from the reclaimed SAE continues to meet the applicable effluent limitations of 4.05.2 and the applicable State and Federal water quality requirements for downstream receiving waters. 19. Rule 4.05.413): If anv of the upland watershed diversions (north or south of the mine area) are to be removed, please describe whether any changes to the design and/or construction of the sediment pond will be needed to account for the runoff from a larger contributing watershed. If so, please provide these designs. 20. Rule 4.05.5: Please discuss what sediment control measures will be implemented for stabilizing erosion of backfilled materials (see also Item 8 in this letter). 21. Rule 4.06: The current proposal for topsoil redistribution is to replace approximately 7000 ccy of topsoil to a depth of 4.5 inches over a total area of 11.3 acres. Another 17.3 acres of disturbed area is proposed not to be covered with topsoil. It is stated that EFMC will test the 17.3-acre-area soils for suitability, and, if indicated by test results, add appropriate soil supplements to enhance revegetation success. Soil productivity should be considered with regard to the approved post-mining land use. As such, soil redistribution and supplementation should be proposed on the basis of the physical characteristics and replacement depths necessary to produce vegetation sufficient to sustain arangeland/livestock grazing use. While 4.5 inches of topsoil may be all that was salvaged by previous mining operations, it will be EFMC's responsibility to ensure that the soils and revegetation seed mixes used on both the refuse pile and the mine floor will be suitable to produce the level of vegetation necessary to sustain the final rangeland use (Rules 4.06.2(3), 4.06.2(4)(a), 4.06.5, and 4.15,1(211. To this end, both the soil replacementlreconditioning plans and the revegetation seed mix should be reviewed and revised to ensure that the currently approved seed mix will provide revegetation sufficient to sustain the approved rangeland final use, given the possibly adverse soil physical characteristics and replacement depths proposed.