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to the Division in an annual subsidence report by December 31 of each year. For <br />mining under Coal Creek and Jerry Creek, two monuments were installed adjacent <br />to Coal Creek and three monuments were installed along Jerry Creek. These <br />monuments were surveyed immediately prior to undermining and twice a year for <br />two years subsequent to undermining. The location of these monuments is shown <br />on the Hydrologic monitoring map, Exhibit 56, Tab Section 18. <br />Results of this monitoring were included in the annual subsidence report. New <br />stnactures such as buildings constructed over previously mined areas were <br />photographed during the next regular subsidence inspection. Follow-up inspections <br />would only be done at the request of the owner or other indication of damage. <br />These new structures will be included in the regular inspection schedule if new <br />mining is projected under the structure. <br />TransColorado Gas Transmission Company (TGTC) installed a gas transmission <br />line across a portion of the permit area, within the South Portals mine area. A July <br />10, 1998 agreement between PCC and TGTC included the commitment for PCC to <br />notify TGTC 6 months prior to undermining the pipeline. This agreement is <br />presented in Appendix 20-9. <br />Until mining resumes in the south portal, no subsidence protection zone or plan for <br />the gas line will be necessary. Should mining via the South Portal be reactivated, <br />the Operator will obtain the Division's approval for a subsidence survey or control <br />and mitigation plan. The plan will be designed so no damage will occur to the <br />pipeline and the plan must be approved by the TGTC. The plan must be in place <br />prior to mining within the subsidence angle of draw of the gas line. <br />20-10 (Rev. 09/07) <br />