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Stipulation No. 12 <br /> The Division directs WECC to complete the installation of the subsidence monitoring <br /> network prior to the initiation of extraction of coal within the panel designated in <br /> Appendix A to the November 1984 permit revision application entitled "Application <br /> to Revise the Mining and Reclamation Plan for the Mt. Gunnison No. 1 Underground <br /> Mine.' This monitoring network is designed to monitor the first panel west from <br /> the SW mains intakes and south of the No. 1 west submains, designated as <br /> "Panel 1 W-1 S," located adjacent to and parallel to the western boundary of <br /> Section 21, Range 90W, Township 13S. This monitoring network shall consist of <br /> substantial monuments designed to resist frost-heave, fire, and the actions of cattle <br /> and wildlife. <br /> STATUS: Complied With <br /> Stipulation No. 13 <br /> The subsidence monitoring network shall be surveyed utilizing conventional ground <br /> surveying techniques, designed to achieve horizontal accuracies complying with the <br /> U.S. Department of Commerce's "Second Order, Class II" survey standards, and <br /> vertical accuracies no less than +0.2 feet. This grid shall be surveyed twice prior <br /> to the initiation of subsidence. In conjunction with these surveys, MCC shall select <br /> and establish a minimum of six triangulation bench mark monuments outside the <br /> area of anticipated subsidence effects, for the purpose of correlation with aerial <br /> photogrammetric post-subsidence surveys. <br /> The requirements of this stipulation have been incorporated into the permit on page <br /> 2.05-147. <br /> STATUS: Terminated December 11, 1992 <br /> Stipulation No. 14 <br /> MCC has requested permission to complete a pre-subsidence aerial <br /> photogrammetric survey of the subsidence monitoring grid, for the purpose of <br /> correlation with the field survey results. It is MCC's intention to utilize aerial <br /> photogrammetric methodology to monitor post-subsidence movements of the <br /> subsidence monuments. The results of the pre-subsidence field and aerial <br /> photogrammetric surveys shall be compared for each grid monument. The aerial <br /> survey will be accepted as accurate and will be used for subsequent <br /> post-subsidence monitoring, in the event that the aerial photogrammetric and field <br /> surveys correlate with an average survey point location deviation of less than 0.2 <br /> feet vertically and horizontally, with survey point location deviations of less than <br /> 0.4 feet vertically and horizontally for less than 95% of the survey points, and with <br /> no single survey point location deviation vertically or horizontally in excess of 0.8 <br /> feet. <br /> STATUS: Forgiven <br /> 8 <br />