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<br />These stations will be installed and surveyed at least three <br />months prior to mining, and will be surveyed quarterly after <br />mining. Monitoring of subsidence stations will continue as <br />long as subsidence may be expected, and will be discontinued <br />only with Division approval. <br />Monitoring points <br />Third North panel <br />Trinidad (formerly <br />and the Purgatoire <br />in March 1988, and <br />occurred under the <br />movement. <br />were established perpendicular to the <br />prior to the panel advancing under the <br />Colorado and Wyoming) Railroad trackage <br />River. These stations were established <br />have been surveyed quarterly since mining <br />area. They have shown no discernable <br />Subsidence resulting from Longwall Mining is considered a <br />form of controlled subsidence. Basin Resources established <br />monitoring stations on the first longwall panel north of Che <br />Purgatoire River to help evaluated the effects of controlled <br />subsidence. Control points were established both parallel <br />and perpendicular to the panel. These points were located <br />such that at least one of the stations would be expected to <br />lie outside the anticipated maximum angle of draw typically <br />encountered at mines in the Western United States. These <br />points were surveyed prior to mining and weekly while <br />mining was proceeding under these stations. These <br />stations will be surveyed quarterly while longwall mining is <br />occurring in the adjacent panel. <br />Additional stations will be established over the NW#2 <br />longwall panel to monitor subsidence and further define the <br />angle of draw. The proposed locations of these stations are <br />shown on Map 17. <br />Survey stations will also be established at all structures <br />located within the projected longwall subsidence trough to <br />adequately determine the effects of subsidence. In <br />addition, a supplemental quarterly visual inspection of each <br />structure will be completed. This monitoring will be <br />completed quarterly and reported to the Division semi- <br />annually. Monitoring of structures will continue as long as <br />subsidence may be expected, and will be discontinued only <br />with Division approval. <br />No structures, other than roads, culverts, and stock ponds <br />are located over areas of projected longwall mining at the <br />Golden Eagle Mine during the next permit term. Monitoring <br />and control plans will be submitted for any new structures <br />on a case by case basis. <br />2.05-55 <br />(Revised OS-18-94) <br />