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For the two final subsidence monitoring surveys, monitoring requirements and <br />procedures will be the same as specified in Rule 2.05.6 (6), and described in the <br />Subsidence Survey, Subsidence Monitoring and Subsidence Control Plan prepared <br />by RMG and contained in Exhibit 23, Subsidence Information. <br />Subsidence Control Plan <br />The subsidence control plan consists of a detailed description of mining methods <br />and ground control measures utilized to minimize subsidence and potential <br />resultant damage. The existing plan prepared by RMG, remained adequate and <br />valid through completion of active mining operations in late 2000. <br />The Southfield Mine was designed to utilize continuous miners for mine <br />development and retreat. Typical equipment utilized in each mine section includes <br />a continuous miner, two (2) shuttle cars, a feeder /breaker, a section power <br />center, and a roof - bolting machine. <br />The Southfield mining operations utilized a room and pillar method of extraction. <br />Mining development resulted in removal of 38 to 53 percent of the total reserves <br />during development of each mining panel. Development was followed by the <br />retreat phase. The retreat phase resulted in removal of an additional 40 to 44 <br />percent of remaining reserves. Final extraction in most sections varied between <br />75 and 93 percent of total reserves. <br />The mine plan showing panel locations, mine entries and the planned sequencing <br />of development and retreat phases is illustrated by the Mine Plan Map, (Map 17). <br />As described in the original RMG subsidence evaluation, there are four (4) <br />structures which had the potential to be significantly impacted by subsidence, <br />resulting in material damage or diminution of reasonably foreseeable use by <br />planned Southfield mining operations. These structures include: <br />TR-36 2.05.6 -63 Revised — October 2003 <br />