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AAGAPITO ASSOCIATES, INC. <br />Mining & Civil Engineers & Geologists <br />715 HORIZON DR., STE 340 <br />GRAND JUNCTION, CO 81506 <br />USA <br />VOICE 970.242.4220 <br />www.agapito.com <br />LAKEWOOD OFFICE <br />303.271.3750 <br />November 09, 2015 134-32 <br />Ms. Barbara Coria <br />Financial Assurance Specialist <br />Colorado Division of Reclamation, Mining and Safety <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />Re: Natural Soda, Inc. Name Change to Natural Soda, LLC, a Delaware Limited <br />Liability Company <br />Nahcolite Project, Permit No. M-1983-194 <br />Rock School Lease Experimental Nahcolite Mine—Permit No. M-1999-051 <br />Dear Ms. Coria: <br />I am writing to you with respect to the change of name of Natural Soda, Inc. to Natural <br />Soda, LLC. In particular, I am writing with respect to the provisions of Hard Rock, Metal, And <br />Designated Mining Operations Rule 6.3.12, which provides, in part, that the "Applicant shall <br />provide information sufficient to demonstrate that the stability of any structures located within <br />two hundred (200) feet of the operation or affected land will not be adversely affected." <br />I and Agapito Associates, Inc. (AAI) have provided consulting services for Natural Soda <br />since 1988 in various capacities including review of mine plans, prediction of subsidence, review <br />of cavern shapes and monitoring of subsurface movement above the caverns. We have assisted in <br />drilling some of the early exploration and horizontal wells and have monitored annual production <br />from the caverns over the past 20 years. We have assisted Natural Soda with permit revisions in <br />1995 and 2003—leading to the introduction of submersible pumps—and with monitoring the <br />movement of the rock above the caverns. <br />I have Bachelor of Engineering in Civil Engineering from the University Of Adelaide, <br />Australia and a Ph.D. from the University of Minnesota in GeoEngineering. I have been elected a <br />as a Fellow of the American Rock Mechanics Association (ARMA). I am a Registered Member <br />of the Society of Mining Engineers (SME) and have been a member of SME since 1970. I am also <br />a Registered Professional Engineer in Colorado and Texas. I have practiced consulting to the <br />mining industry since 1974 with over 38 years of service in Colorado. My resume is attached. <br />GEOENGINEERING • MINING ENGINEERING • CIVIL ENGINEERING <br />