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Hydrologic Communication Repair and Reclamation Plan <br /> Background Summary <br /> Hydrologic communication between the surface and underground workings was first <br /> observed in 2014. On May 7, 2014, an adjacent landowner enlarged the pond and dug <br /> a diversion trench to an area of possible subsidence above and upgradient of the <br /> backfilled and reclaimed portals of the Roadside South Portal Mine. The landowner <br /> commenced running approximately 4 cfs of water, diverted from Rapid Creek to the <br /> newly constructed trench. No apparent beneficial use was being made with this water. <br /> Between May 7 and June 11 the majority of this water found its way to the end of the <br /> new trench where it infiltrated into the ground. After a period of time the water filled <br /> the void behind the backfilled portals. The French drain constructed under the <br /> backfilled portals allowed the water to decant in a controlled manner. The pathway the <br /> water took to reach the underground working was unknown. However, it was <br /> speculated the water was somehow reaching a nearby sealed shaft. <br /> The Operator made a commitment to DRMS to conduct an investigation to determine <br /> the extent of the hydrologic communication existing between the underground <br /> workings of the Roadside Mine and the properties overlying these workings that belong <br /> to Mr. Rudolph Fontanari and Mr.Jason Carey. <br /> The Operator commissioned an electrical resistivity tomography(ERT) study of the <br /> general area of the trench and the sealed shaft. See Fugro Consultants, Inc. report <br /> dated April 28, 2016 located in Appendix 14-14. <br /> Huddleston-Berry Engineering&Testing, LLC (HBET) reviewed the Fugro report and <br /> came to the following conclusion: <br /> As indicated in the referenced Fugro report, the ERT data clearly shows a <br /> vertical low resistivity zone in the subsurface. This low resistivity zone <br /> correlates extremely well with the location of the old air shaft. Based <br /> upon the results of the ERT survey, test pit observations, drilling <br /> information provided by others, and site geology, HBET believes that the <br /> old air shaft is the pathway for water migration into the mine workings. <br /> (See HBET report dated May 9, 2016 located in Appendix 14-14) <br /> The Operator was not satisfied with the resolution of the initial ERT study since the <br /> pathway between the trench and the shaft was not identifiable. Therefore, another <br /> higher resolution ERT study was performed. See Fugro Consultants, Inc. report dated <br /> August 23, 2016 located in Appendix 14-15. <br /> TR-69 14-33 12/16 <br />