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these potentiometric surfaces are not currently being provided within the AHR. Due to the <br />potential impacts from dewatering to the hydrologic balance, as well as the potential for increased <br />aquifer communication due to subsidence, it is appropriate to include potentiometric surface maps <br />with the annual hydrology report going forward. Please provide the Division with potentiometric <br />surface maps for the Wadge Overburden, Twentymile Sandstone, Trout Creek Sandstone, and <br />Fish Creek Sandstone bedrock units. <br />SECTION V — PERMIT VARIANCES AND SPECIFIC APPROVALS <br />The Foidel Creek Mine permit does not include a variance under Rules 2.06.2 (experimental practices), <br />2.06.3 (mountaintop removal), and 2.06.5 (approximate original contour (AOC) for steep slope mining). <br />The permit does include a variance from contemporaneous reclamation for combined surface and <br />underground mining operations (2.06.7) in those remnants of pits from a former operation (CYCC Permit <br />C-1981-071) that have been incorporated into Permit C-1982-056 for portal access to underground <br />workings, and other surface facilities of the current underground operations. <br />SECTION VI — BONDING SUMMARY <br />A compiled reclamation cost estimate was developed by the Division as a part of the Permit Renewal No. <br />6 process that was approved on October 8, 2013. The Division's reclamation costs have not been updated <br />since that date. However, a summary of those costs in addition to any revision adjustments has been <br />completed for this 2015 Midterm Review. Please see the attached reclamation cost estimate. As of <br />November 6, 2015, the Division estimates liability at the Foidel Creek Mine is $10,553,208.47. This <br />amount is sufficient to assure completion of the remaining reclamation work at the site if the work had to <br />be performed by the Division, including the cost of re-establishing vegetation on any revegetated areas, <br />should those areas fail. The permittee currently has a Self -Bond in place for the site (SB -008) in the <br />amount of $10,056,089.00. <br />The Division requests that TC review the reclamation cost estimate attached to this midterm review <br />document. If Twentymile Coal, LLC. has any specific concerns regarding the reclamation cost <br />estimate, please submit them by December 23, 2015. <br />Enclosures: Midterm Review No. 7 (MT7) Cost Estimate; C-1982-056 <br />Foidel Creek Mine -14- 11/23/2015 <br />