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ARCADIS ARCADIS U S,Inc <br /> 630 Plaza Drive <br /> Suite 200 <br /> Highlands Ranch <br /> MEMO Colorado 80129 <br /> Tel 720 344 3500 <br /> To Copies Fax 720 344 3535 <br /> Mr. Ron Thompson Monica Heintz,ARCADIS <br /> New Elk Coal Company, LLC <br /> From- <br /> Jerry Koblitz <br /> ARCADIS US, Inc. <br /> Date ARCADIS Protect No <br /> February 27,2014 C0001572.0003.00001 <br /> Subject. <br /> Assessment of the Influence of Mining Activities at New Elk Mine on Surface Water <br /> Quality in the Purgatoire River <br /> t. Introduction <br /> On behalf of New Elk Coal Company, LLC (NECC),ARCADIS U.S. Inc. (ARCADIS) presents this <br /> memorandum Assessment of the Influence of Mining Activities at New Elk Mine on Surface Water Quality <br /> at the Purgatoire River(memo). This memo summarizes geochemical data analysis and modeling <br /> conducted in support of assessing potential effects to surface water quality from mine dewatering activities <br /> at the New Elk underground coal mine and preparation plant(New Elk Mine). Background information <br /> presented here and the data used in analysis and modeling were previously reported in the New Elk Mine <br /> Annual Hydrologic Monitoring Report 2012 (NECC 2012). <br /> Production from the Allen Seam at the New Elk Mine occurred intermittently between 1952 and 1988. In <br /> 1988, the mine was temporally sealed and was allowed to flood. Between February 2001 and November <br /> 2008 depth to water in the mine and mine water quality were monitored. In December 2008, active <br /> dewatering of the mine began in order to prepare for mine rehabilitation. Mining activities were resumed in <br /> late 2011 with mining of the Blue Seam, and in January 2012 mining in the Allen Seam was resumed. <br /> Additional details regarding past and current facility operations, as well as environmental monitoring and <br /> compliance programs at the New Elk Mine are presented in the Annual Hydrogeologic Monitoring Report <br /> 2012 (NECC 2012) and in National Pollution Discharge Elimination System (NPDES) permit <br /> documentation. <br /> cWuwsVmhm"mla*ataft*n ros*mndows Page. <br /> Itertporary M�rnat filaslcon�entouUookViceufnhiYiewekcoalwrfacewaBannfluenceassessmeMnerta.doac 1 I8 <br />