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David Berry -21- June 20, 1996 quantity of water in the springs and seeps, considering the potential for ground water drawdown. The requested discussion is located in at least three places in the permit. On page 2.05-68 (a)(iii), Exhibit 15 page 39, and in Section 2.05.6(6), page 2.05-85, which states in part: Springs could be damaged by subsidence cracks in the impervious layer below the springs which would cause them to drain to the formation below". A comment on the quantity of water in the springs and seeps was added to page 2.05-68 as requested. Enclosed are revised pages 2.05-66, 68i and 69. 83. On page 2.05-68, the possibility is raised that several ponds may be in the projected angle of draw but that damage would be minimized by the effects of subsidence. The DMG requests that BRL comment on which ponds may be impacted by subsidence and to what degree. Section 2.05.6(6) page 2.05-83 states in part: "Five ponds have been identified within the permit and adjacent area. Two of the ponds (P-1 and P-2) are within the angle of draw of the proposed mine workings". Section 2.05.6(6) page 2.05-85 states in part: "The ponds could be damaged and drained by a subsidence crack that would occur directly below the pond. The probability of such an event is very low. Any pond effected by a subsidence crack could be repaired through the installation of a pond lining of a impervious material such as bentonite or synthetic liner material". Section 2.05.6(6) pages 2.05-89 & 90 state in part: "Pond P-1 is located in a zone of greatest subsidence impact. For this reason, this pond will be protected by a limited extraction zone. The limited extraction zone is defined by extending a safety zone a distance of fifty feet around the pond and then projecting a line down at the angle of draw until it intersects the coal seams. Pond P-2 is located in a zone of intermediate subsidence however the overburden below P-2 is nearly 1,000'. For all practicable purposes Pond P-2 is in a zone of minor subsidence. Therefore, no limited extraction zone will be provided for P- 2". 84. The discussion of the probable hydrologic consequences for surface water and ground water, found on pages 2.05-70 and 2.05-71, concern the quality of water. The DMG requests that the discussion be expanded to include a discussion of the probable hydrologic consequences on the water quality for surface water and ground water. Enclosed is revised page 2.05-70 and 71 which expands the discussion of the probable hydrologic consequences on the water quality for surface water and ground water. 85. On page 2.05-72 of the permit application, it is stated that the sediment ponds will be sampled in compliance with NPDES