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<br />• <br />V. CONCLUSIONS <br />Underground development has progressed beneath Foidel Creek <br />without any measureable surface subsidence taking place. <br />Underground development has progressed in 1st Panel South with <br />noticeable subsidence taking place in the full pillar extraction <br />area. The first noticeable subsidence occurred August 21, 1986. <br />Monuments SM-26 through SM-30 experienced subsidence movement from <br />,02~ feet to 0.5 feet with a miximum subsidence of 0.5 feet on <br />maanument SM-27. The spoils slope south of the mine facilities are <br />currently stable at a 2H:1V slope. <br />A surface reconnaissance survey was conducted of all the mine <br />permit area, to determine if there is any evidence of possible <br />differential movement, or structural damage to surface facilities. <br />There is no apparent evidence of differential movement or <br />structural damage to surface facilities. <br />The next $h~eduled resurvey of subsidence monuments SM-7 <br />through SM-41, and the surface structures, will begin in March, <br />1987, and will be followed by another resurvey in June, 1987. A <br />Technical Revision request will be submitted to discontinue the <br />monitoring of the spoils area south of the mine facilities. <br />Currently the spoils slopes are stable and have been stable for <br />riore than a year. The monuments used to monitor the spoils area <br />are designated SP-2, SP-3, and SP-4. Also, the Technical <br />Revision will request that monitoring of monuments FC-2, FC-3, <br />and FC-4 be done annually instead of quarterly. These monuments <br />have never shown subsidence in over three years and no subsidence <br />is expe{I~ed in the future. <br />n E- r"~=~J'ar ,~ <br />• <br />