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J.E. Stover & Associates -19- May 31, 1996 Bowie No. 2 Mine Map 20, Sedimentation Control Plan, suggest a larger curve number may be appropriate. It appears that the drainage basin for A3b is composed of about 75$ disturbed area and about 25$ burned area. Using a curve number of 89 for the disturbed area and 65 for the burned area, an average curve number of about 83 would seem appropriate. Please justify a curve number of 63 for basin A3b. 59. The construction of the underdrain for the coal waste pile does not mention the use of a filter blanket over the rock underdrain, to add further protection from clogging. Please comment on this. 60. The coal waste pile topsoil pile and coverfill stockpile need to be added to Map 21-1, Drainage Plans, and Map 20, Sedimentation Control Plan. 61. On page 2.04-36, it is stated that mining will not impact a surface source of water. Please comment on the possibility of subsidence impacting water flow in Terror Creek and Hubbard Creek. 62. Rules 2.04.7(2)(a) and (b) require surface water quantity data for streams in the permit area and adjacent area. Page 2.04-33 lists flow data for Hubbard Creek. Please provide flow data for Terror Creek. 63. Rules 2.04.7(2)(a) and (b) require specific surface water quality data for those streams receiving discharges from affected areas within the permit area. Since springs that may be affected by mining flow into Terror Creek and Hubbard Creek, please submit surface water quality data for those two streams. 63a. How will the operator prevent coal deposition on otherwise undisturbed ground beneath all conveyors? Provide a detailed plan to prevent this common problem. 2.05.3(5) Topsoil The soils report indicated that C horizon material is generally not suitable for salvage due to its stony nature. However, BRL has indicated that C horizon material will be salvaged. Is BRL actually planning on salvaging C horizon soil as stated on page 2.05-33? If so, in what soil units will this practice be performed, and has this already been calculated into the topsoil balances? There appears to be some confusion in this area, therefore;