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SubTerra, Inc. Peabody Twentymile Coal LLC 09/2712014 <br />Foidel Creek Mine <br />Permit Revision for Longwall Mining in the Wolf Creek Seam - Subsidence Evaluation <br />3. In the case of Option (1), evaluating pre - placement of the Ballast. This involves assessing <br />whether pre - ballasting will result in unacceptable track gradients prior to and during <br />undermining. <br />This process has previously been implemented prior to each panel in the Wadge Seam undermining <br />the Energy Spur. <br />3.4.2. Possible Effects of Planned Remediation on Fish Creek and Its AVF <br />As shown on Drawings 2 and 4, the first area where remedial re- ballasting may impact Fish Creek or <br />its AVF is where the track crosses the rigid -yield pillar pair between 6 -Right and 7 -Right (at <br />approximately Station 416). The anticipated magnitude of required re- elevation at this Station will be <br />minimal due to the reduced subsidence over the pillars and extending the base of the ballast prism by <br />6 -feet on either side of the track should not be a problem at this location. <br />The second area of potential concern is where the track crosses over Fish Creek, approximately at <br />Station 401. The anticipated magnitude of required re- elevation at this Station is again expected to be <br />minimal and extending the base of the ballast prism by 6 -feet (at 2:1, H :V) on either side of the track is <br />not likely to require extension of the culvert(s) beneath the track. <br />8 PN: 2013 -26 <br />