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mined) and the Twen[y Mile Sandstone, consists of materials of such low perme- <br />~~ <br />ability [hat water movement would be significan[ly retarded. Further support <br />concerning a negative impact on the Twenty Mile Sandstone is supported by the <br />Empire Energy permit concerning subsidence and the Twenty Mile Sandstone dur- <br />ing longwall mining operations. <br />HBH/jb 5/87 <br />i <br />r <br />