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<br /> <br />mined) and the Twenty Mile Sandstone, consists of materials of such low perme- <br />ability that water movement would be significantly 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 Long wall mining operations. <br />HBH/jb 5187 <br />