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Stipulation No. 15 <br /> MCC has requested permission to complete aerial photogrammetric surveys of the <br /> subsidence monitoring grid subsequent to the initiation of subsidence, for the <br /> purpose of monitoring subsidence monument movements. The accuracy of the <br /> aerial photogrammetric surveys shall be determined by a comparison of <br /> triangulation bench mark monument field and aerial photogrammetric survey results <br /> following each semi-annual survey. The results of each aerial photogrammetric <br /> survey shall be accepted as accurate, in the event that the aerial photogrammetric <br /> and most recent annual triangulation monument field survey results correlate with <br /> an average triangulation monument location deviation of less than 0.2 feet vertically <br /> and horizontally, with triangulation monument location deviations of less than 0.4 <br /> feet vertically and horizontally for less than 83% of the triangulation monuments, <br /> and with no single triangulation point location deviation vertically or horizontally in <br /> excess of 0.8 feet. <br /> STATUS: Forgiven <br /> Stipulation No. 16 <br /> In the event that the aerial photogrammetric monument surveys fail to meet the <br /> stipulated accuracy criteria, MCC shall utilize traditional field survey techniques to <br /> establish the reasons for lack of correlation. If the results cannot be correlated, <br /> MCC shall resume traditional field survey monument monitoring, in compliance with <br /> the accuracy criteria and standards contained with Stipulation No. 15. <br /> STATUS: Forgiven <br /> Stipulation No 17 <br /> The Division directs MCC to submit reports of its subsidence monitoring program on <br /> a semi-annual basis, commencing one month after the installation and initial <br /> surveying of the subsidence monuments. Further, due to the complexity of the <br /> permit area, geology, presence of landslides and steep slopes, and sensitive <br /> hydrologic elements, MCC is directed to submit a proposed subsidence monitoring <br /> report format to the Division for approval. This report format should recognize the <br /> importance of continual update of subsidence data interpretation, monitoring of <br /> ground water levels and spring flows, monitoring of mine inflow, and subsurface <br /> ground conditions which could be correlated to subsidence prediction. This report <br /> format shall be approved by the Division prior to the commencement of extraction <br /> of coal within the subsidence test panel designated in Appendix A to MCC's <br /> November 1984 permit revision application (Panel 1 W-1 S). <br /> In a memo dated March 5, 1990 from Matthew Hayes, it was determined that this <br /> stipulation could be terminated as of October 27, 1989, because it was incorporated into <br /> the permit on page 3-78A. However, with the reorganization of the permit (TR-59), this <br /> stipulation was not included. Page 2.05-147 was updated to include this commitment but <br /> 9 <br />