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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 quantitiy <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 />