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• and the extremely rough terrain will require helecopter transport to accomplish <br /> the monument construction. <br /> Monitoring: <br /> The proposed subsidence monitoring net will be surveyed using a ,Mild T-2 <br /> Theodolite and a Wild Distomat. Experience with this equipment at similar <br /> subsidence monitoring programs at the York Canyon Mine, New Mexico and Snowmass <br /> Coal Company's Thompson Creek No. 1 Mine, Colorado, indicates that this equip- <br /> ment will provide surveying results within the Third Order, Class II accuracy <br /> required in the RFP. <br /> The monument net and surveying system proposed for this study is designed <br /> to provide the following data: <br /> 1. Maximum subsidence overthe lon wall panels from mining each lift <br /> g <br /> • 2. Horizontal movement of the ground surface from mining each lift <br /> 3. Subsidence development profiles along panel centerlines for each <br /> lift <br /> 4. Subsidence profiles across each panel from the panel centerline to <br /> zero subsidence for each lift <br /> 5. Strain profiles across each panel from the panel centerline to zero <br /> subsidence for each lift <br /> 6. Determination of the angle of draw for each lift. <br /> In addition to this discrete data, it is hoped that additional information <br /> addressing the following points can be obtained: <br /> 1. The effects of dipping seams on subsidence <br /> 2. The effects of topography on subsidence <br /> 3. The effects of geology on subsidence <br /> 4. The effects of virgin vs. previously mined ground on subsidence <br /> -11- <br />