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Post-Minim Monitoring <br />Previously established subsidence monitoring stations will be surveyed on an <br />annual basis. Annual building inspections will be eorx3ucted in conjunction with <br />the subsidence monitoring and will docaanent any change in the conditions noted <br />in the initial inspection or any new corxiitions which develop and may be <br />attributable to mining activity. Should the occupant or owner of a building <br />identify a particular concern, an immediate inspection will be conducted with a <br />subsidence survey corrlucted as soon after as possible, weather wnrlitions <br />permitting. <br />Minim 'Pechnigues <br />A 300 ft. radius solid coal block will be left below all buildings within the <br />NC-37210 lease area. Calculations using an angle-of~3raw of 21.5° and existing <br />overburden depth show that the 300 ft. radius is sufficient for protection of <br />those buildings within or adjacent to areas to be mined, utilizing existing <br />subsidence data. <br />Standard room and pillar mining techniques will be utilized throughout the <br />remaining lease areas with the exception that partial extraction techniques with <br />pillars designed to withstand anticipated loadings will be used in the buffer <br />zone area within Stevens (°Ulch. ~VCC will continually evaluate subsidence data <br />and propose alternative mining techniques for specific areas if warranted. <br />Repair Procedure <br />'Ifie solid coal blocks beneath buildings within the CoC-37210 lease area at <br />overburden depths of less than 760 feet will prevent subsidence aryl possible <br />subsequent damage from occurring. Should subsidence damage, or structural damage <br />potentially linked to subsidence occur at any buildings within other areas, a <br />subsidence survey will be conducted at the earliest opportunity to determine <br />whether subsidence has taken place. If a reasonable cause and effect <br />relationship can be established based upon the subsidence survey and the damage <br />observed, ~VCC will repair, or will contract to repair any affected building to <br />at least as good a condition as documented in the pre-mining inspection. ~VGC <br />believes that such repairs, under a worst case subsidence impact projection, are <br />economically and technologically feasible and coimnits to completing repairs in <br />a timely fashion in cooperation with the building owner. <br /> <br />MR 93-87 Revised 09/30/93 <br />