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SUBSIDENCE MONITORING DATA <br />Semi-annual Report, July -December 1992 <br />Twentymile Coal Company, Foidel Creek Mine <br /> Survey Elevations (ft) <br /> Pre-mining Previous <br />Map23A Profile Elevation Report Subsidence <br />Point Distance Northin Eastin ft 06/02/92 0983/92 This Period Total <br />B-Series Line (perp endicular <br />B-22 0 41951.3 12226.2 6822.8 6822.6 6822.9 0.3 0.1 <br />B-21 50 41903.3 12227.9 6825.2 6825.4 6825.2 -0.2 -0.0 <br />B-20 100 41852.6 12228.6 6826.6 6826.8 6826.7 -0.1 0.1 <br />B-19 150 41803.7 12227.9 6829.1 6829.3 6829.2 -0.1 0.1 <br />B-18 200 41752.8 12230.5 6831.5 6831.8 6831.7 -0.1 0.2 <br />B-17 300 41654.0 12230.3 6835.6 6835.6 6835.5 -0.1 -0.1 <br />B-16 400 41553.9 12231.3 6837.2 6837.2 6837.2 0.0 -0.0 <br />B-15 500 41453.8 12233.5 6840.5 6840.5 6840.6 0.1 0.1 <br />B-14 650 41303.9 12234.3 6847.5 6847.4 6847.4 0.0 -0.1 <br />B-13 725 41229.7 12237.0 6849.6 6849.5 6849.4 -0.0 -0.2 <br />A- 4 1100 40852.4 12242.1 6872.7 6869.0 6869.2 0.2 -3.5 <br />B-12 1450 40503.1 12242.9 6898.5 6895.2 6895.3 0.1 -3.2 <br />B-11 1550 40402.7 12245.3 6903.7 6900.6 6900.7 0.1 -3.0 <br />B-10 1700 40251.9 12248.0 6907.7 6904.5 6904.6 0.1 -3.1 <br />B- 9 1800 40151.3 12248.5 6911.7 6908.0 6908.1 0.1 -3.6 <br />B- 8 1900 40052.2 12250.6 6915.5 6911.2 6911.3 0.1 -4.2 <br />B- 7 2000 39952.8 12251.9 6920.5 6915.9 6916.0 0.0 -4.5 <br />B- 6 2050 39903.0 12252.3 6923.3 6918.9 6918.9 -0.0 -4.4 <br />B- 5 2100 39854.5 12251.7 6926.1 6922.1 6922.0 -0.1 -4.1 <br />B- 4 2150 39803.3 12251.7 6929.6 6925.9 6925.8 -0.0 -3.8 <br />B- 3 2200 39751.6 12253.0 6933.5 6930.2 6930.1 -0.1 -3.4 <br />B- 2 2300 39652.0 12254.3 6935.3 Destroyed Destroyed <br />B- 1 2400 39553.3 12254.1 6943.2 6940.2 6940.2 -0.0 -3.0 <br />A-Series Line (cent erline) oz/os/s2 <br />A- 2 0 40849.8 12040.6 6862.1 6858.1 6858.401 0.3 -3.7 <br />A- 3 100 40851.4 12138.0 6867.3 6863.3 6863.598 0.3 -3.7 <br />A- 4 200 40852.4 12242.1 6872.7 6868.9 6869.161 0.3 -3.5 <br />A- 5 300 40856.2 12340.8 6876.3 6872.4 6872.73 0.3 -3.6 <br />A- 6 375 40853.3 12414.9 6878.5 6874.6 6874.851 0.3 -3.6 <br />A- 7 465 40857.3 12506.1 6878.5 6874.8 6874.968 0.2 -3.5 <br />