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<br />J.E. Stover & Associates -30- May 31, 1996 <br />Bowie No. 2 Mine <br />myriad of authors in the USA have developed correlation factoring <br />to correct for mechanical differences between overburden response <br />of the USA and England, as well as the mechanical differences <br />between subsidence above longwall and room & pillar extraction. <br />These techniques, which have been employed by previous permitted <br />operators within Colorado, are acceptable to the Division. <br />The author of Exhibit 15 references a report prepared by T. <br />Brooks in 1983, as a source for geologic and hydrologic <br />properties and a previous subsidence impact evaluation <br />["Hydrology and Subsidence Potential of Proposed Coal-Lease <br />Tracts in Delta County, Colorado". USGS, Water Resources <br />Investigation Report 83-4069]. <br />90. The operator should provide a copy of this report to the <br />Division. <br />The remainder of the comments will correspond to the report <br />format. <br />