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claystones and shales present in the overburden" (page 41). <br />The actual depth of cover at the location where subsidence occurred under South Prong Creek was an order of <br />magnitude less than the minimum depth of cover contemplated by the authors of the approved subsidence <br />evaluation study in Exhibit 60E. As the subsidence predictions made in Exhibit 60E were not valid for the actual <br />mining conditions, the predictions of hydrologic impacts made in Exhibit 55B were also not valid. <br />STEPS NECESSARY TO ABATE VIOLATION (REMEDIAL ACTION): <br />Abatement Step 4 Description <br />1 Submit a technical revision to: (1) reconcile the mine plan with the subsidence survey and <br />include the information in an updated subsidence control plan as required by 2.05.6(6)(1); (2) <br />update predictions of probable hydrologic consequences as necessary <br />TIME FOR ABATEMENT (NOT MORE THAN 90 DAYS): <br />ON OR BEFORE last abatement due date <br />Abatement Step 4 Due Date <br />1 December 1, 2020 <br />Page 4 of 4 <br />