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• V. CONCLUSIONS <br />Underground development has progressed beneath Foidel Creek <br />without any measurable surface subsidence taking place. Underground <br />development has progressed in 1st Panel South with subsidence <br />taking place in the full pillar extraction area. Monuments SM-15 <br />through SM-31 have experienced subsidence movement from 0.4 feet to <br />3.2 feet with a maximum subsidence of 3.2 feet on monument SM-26. <br />The spoils slope south of the mine facilities are currently stable <br />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 visible evidence of <br />differential ground movement, or structural damage to surface <br />facilities associated with underground mining. There is visible <br />evidence of ground movement near monuments SPS-19 through SM-26; <br />one inch wide cracks up to twenty feet long were evident. Structural <br />damage occurred to the Northeast Water Tank. The tank and connecting <br />water line fractured and had to be replaced by a new water tank and <br />connecting water line. This damage was possibly due to subsidence. <br />The next scheduled resurvey of subsidence monuments and surface <br />structures, will begin in March, 1988, and will be followed by <br />another resurvey in June, 1988. <br />• <br />C~ <br />