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<br />The Trinidad City water main parallels highway 12 and lies <br />outside of the affected area. <br />5) Septic Systems and Sewer lines. Not applicable, none <br />are known to exist within the affected area. <br />6). Propane Tanks. Not applicable, none are known to exist <br />within the affected area: <br />7). Aquifers. No aquifers that are of beneficial use lie <br />within the affected area. There are no significant aquifers <br />known to exist within the affected area. <br />S) Wells are shown on Map 8, Regional Hydrology. None of <br />the wells are believed to lie within the area to be affected <br />by mining. <br />9) The Purgatorie River Alluvial Valley Floor (AVF) is a <br />Renewable Resource area. The AVF lies within an area of <br />limited extraction and is protected by a Subsidence Control <br />Plan. <br />(b) Description of the worst possible consequences of <br />subsidence within the permit and adjacent area. <br />(i)(A) A brief description of pre- and postmining land use <br />is shown on Map 4 Premine Land Use, and Map 12, Post Mine <br />Land Use, and in section 2.04.3 of the permit. <br />(i)(B) No subsidence is anticipated from mining within <br />areas of limited (less than 50~) extraction. Subsidence <br />Monitoring of mining in the Third North Mains has <br />documented that no subsidence occurred from limited <br />extraction mining within this area. <br />Monitoring of the Northwest #1 Longwall panel has determined <br />that subsidence will occur as a result of longwall mining. <br />Mining at depths of 500-700 from the surface has resulted in <br />subsidence of 4.5-6.5 feet over the center of the panel. <br />The angle of draw cited for Western Coal mines is 15°-25° <br />and for the Raton Basin, 16°= (Mining Engineering Handbook, <br />p. 950). Monitoring data for the NW#1 panel indicates that <br />the angle of draw may exceed this range. Additional <br />monitoring to provide better resolution and more accurately <br />define the angle of draw is planned for the Northwest #2 <br />longwall panel. <br />(i)(C) Brief description of material subsidence damage or <br />diminution of reasonably foreseeable use of structures and <br />renewable resource lands resulting from the occurrence of <br />subsidence related phenomena: <br />2.05-49 <br />(Revised 1-17-94) <br />~~ ~~ <br />