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2.05.6(6) <br />The Operator has installed 15 subsidence monuments along the Pitkin Mesa <br />Pipeline to monitor subsidence. Because of the monument's close proximity <br />to Stevens Gulch Road, the same monuments will serve to measure <br />subsidence along the road if any. The monuments will be installed six <br />months prior to mining under the Pitkin Mesa Pipeline. <br />The Operator has installed subsidence monuments on the Turkey Track <br />Ranch structures since they a close to the edge of the projected angle of <br />draw. <br />The results of the subsidence monitoring programs and the results of the <br />visual inspections for mass movement features will be submitted semi- <br />annually for the reporting periods ending in June and December, within 30 <br />days of the end of the reporting periods. <br />The subsidence monitoring program will extend at least two years beyond <br />cessation of mining in any area, consistent with the need for verification of <br />the subsidence prediction. The DRMS must approve the cessation of <br />subsidence monitoring through a technical revision. <br />PR-13 2.05-158- 02/13 <br />