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SubTerra, Inc. Peabody Twentymile Coal LLC 09/27/2014 <br />Foidel Creek Mine <br />Permit Revision for Longwall Mining in the Wolf Creek Seam - Subsidence Evaluation <br />6.4. Predicted Worst Case Effects <br />Wells completed into the Wolf Creek seam and its immediately overlying overburden will be affected <br />by mining if located within a distance equal to seam depth of the mining area. Furthermore, any Wolf <br />Creek Seam well located inside the mining area will dry up most likely during panel development. <br />Shallow surface wells are likely to initially experience depressed water levels but recover within a year <br />of undermining. <br />6.5. Proposed Monitoring Requirements <br />There are several proven water level monitoring systems that are available for use on this project <br />ranging from simple manual systems to systems that report data automatically via the internet. <br />We recommend that Peabody Twentymile Coal LLC give consideration to deploying automatically <br />monitored piezometers at key wells and use the collected data to immediately identify impacts. <br />17 PN: 2013 -26 <br />