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Chapter IV <br /> subsidence lead to the logical conclusion that there <br /> would be no diminution of their reasonably use even if <br /> worst case subsidence did occur. The limited quantity <br /> of aquifer recharge, if any, from the geologic formations <br /> that lie above theminable coal seams, in comparison to <br /> the very large amounts of water produced by the <br /> extensive Coal Basin and East Muddy watersheds, lead <br /> to the logical conclusion tht subsidence would have no <br /> effect on the reasonably forseeable aquifer recharge <br /> function. <br /> In conclusion, the history of mining in Coal Basin demonstrates that subsidence has <br /> not been a problem. A recent on-site inspection above the heaviest mined out areas in <br /> Coal Basin by two Willard Owens Associates, Inc. professionals, a mining engineer and <br /> a geologist, resulted in a negative report on locating any indications of surface <br /> subsidence. The 1984 study by Dr.Bruce Collins, based on four years of monitoring <br /> data, substantiates the conclusion that subsidence above the Coal Basin mining <br /> operations poses no problems to the identified renewable resource lands. <br /> 4. Subsidence Monitoring Program. <br /> a. Narrative Explanation of Program. <br /> The subsidence monitoring program proposed by Mid-Continent for the Coal Basin <br /> area above underground mine workings is designed to determine the magnitude and <br /> development of any subsidence phenomena that might occur within the mining permit <br /> area. Specifically, the program is designed to provide the following data: <br /> — Maximum subsidence resulting from mining. <br /> — Horizontal movement of the ground surface resulting <br /> from mining. <br /> — Subsidence development profiles. <br /> — Subsidence profiles resulting from mining. <br /> — Strain profiles resulting from mining. <br /> — Determination of the angle of draw. <br /> — The effects of depth and mining geometry on <br /> subsidence. <br /> The proposed monitoring program will result in the development of site specific <br /> subsidence prediction models for the Coal Basin area. These models, used in <br /> conjunction with monitoring points at selected locations over the mining areas, will allow <br /> for the determination of the magnitudes and timing of subsidence movements. <br /> 34 <br />