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2.05.6(6) Subsidence Survey, Subsidence Monitoring, and Subsidence Control Plan <br />(b)(ii) <br />The description of worst possible subsidence consequences, prepared in <br />accordance with Section 2.05.6(6)(b)(i), determined that no material <br />damage or diminution of reasonably foreseeable use could result in the <br />event of mine subsidence. Therefore a monitoring program is required to <br />determine the accuracy of that conclusion: <br />(c) Subsidence Monitoring Program: <br />(c)(i) Surveyed subsidence monuments will not achieve the monitoring required to <br />determine if a light use road has been damaged. Therefore, the Applicant will <br />visually monitor the light use roads above the area to be mined to determine if <br />there has been material damage. Monitoring will begin three months after <br />commencement of mining and will continue for two years after mining ceases. <br />During temporary cessation, subsidence monitoring would cease for the term, <br />and begin again three months after mining begins. Mitigation measures would <br />apply to roadways if a hazard has developed, and if necessary, roads would be <br />backfilled and graded to a pre -subsidence grade, as best as can be determined <br />in the field. Mitigation measures will be subject to the approval of BLM. <br />As explained below, results of the monitoring program shall be submitted <br />to the DRMS semi-annually beginning after mining resumes depending on <br />mining progress. The monitoring program will extend for a time, beyond <br />cessation of mining in any area, consistent with the need for verification of <br />the subsidence prediction. <br />(c)(ii) A map showing the location of subsidence monuments is not provided <br />since no monuments are to be installed. The road to be monitored is <br />shown on Figure 4.2-2. Monitoring of the light use road that bisects the <br />southeast corner of the permit boundary will not begin until mining <br />approaches the road. Since the mine is idle the timing to mine in the <br />southern extent of the permit boundary near the light use road is <br />indeterminate. <br />PR -02 2.05-72 10/12 <br />