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<br />~ Subsidence Monitoring Plan <br />• Benchmarks will be established outside of the <br />mining area <br />• Survey monuments will be installed on solution <br />mining well pads along the center and at the <br />periphery of each 5-year mine panel <br />~ • The elevations of section corner monitors within the <br />well fields will be measured relative to benchmark <br />elevations <br />• Surface survey of the benchmarks and monuments 6 <br />will be conducted semi-annually <br />