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West Elk Mine <br />HydroGeology Solutions, Inc. <br />Paul Holder, PG, President <br />Mayo and Associates, Salt Lake City, UT: <br />Dr. Alan L. Mayo, Ph.D., Registered Geologist/Principal <br />Associated publications: <br />• Mayo, A.L., Morris, T.H., Peltier, S., Petersen, E.C., Payne, K., Holman, <br />L.S., Tingey, D., Fogel, T., Black, B.J., and Gibbs, T.D., 2004, Active and <br />inactive groundwater flow systems: Evidence from a stratified, <br />mountainous terrain; Geological Society of America, Bulletin, v. 115, p. <br />1456-1472. <br />Mayo, A.L., and Koontz, W., 2000, Fracture flow and groundwater <br />compartmentalization in the Rollins Sandstone, Lower Mesaverde Group, <br />Colorado, USA: Hydrogeology Journal, v. 8. p. 430-446. <br />Mountain Coal Company, LLC, Somerset, CO: <br />Wendell Koontz, Registered Geologist <br />Michael Peacock, P.E., Mine Engineer <br />Mark Scanlon, Registered Geologist <br />Casey Smith, Registered Geologist <br />Jessica (Loveland) Wilczek, P.E., Environmental Specialist <br />Wright Water Engineers, Inc., Denver & Glenwood Springs, CO: <br />Kenneth R. Wright, P.E., Principal Engineer/CFO <br />Jonathan Jones, CEO <br />Jonathan M. Kelly, Vice President/ Sr. Water Resources Engineer <br />Gary D. Witt, P.G., Vice President/Sr. Hydrogeologist/Geological Engineer <br />C. Richard Dunrud, P.E., Engineering Geologist <br />Ernest Pemberton, P.E., Adjunct Scientist, former Head of Sedimentation & River <br />Hydraulics Section, U.S. Bureau of Reclamation <br />E. Robert Weiner, Ph.D., Environmental Scientist <br />Tetra Tech, Salt Lake City, UT: <br />Michael Egan, P.G. Senior Geologist <br />Chris Hayes, Geologist <br />Tom Grey, Mine Engineer <br />Government Agencies & Specialists Consulted. <br />Bureau of Land Management, Montrose, CO: <br />Lynn Lewis, Geologist <br />Desty Dyer, Mining Engineer <br />Grand Mesa, Uncompahgre, and Gunnison National Forests, Paonia & Delta, CO: <br />Andrea Wang, Range Conservationist <br />Terry Hughes, Soils Specialist <br />Rev. 11/04, 03/06- PR10; 09/07- PR12; 10/08- PR14; 01/16- MR415, 03/17- MR421; 07/18- PR15 <br />2.03-3 <br />