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PART I. AUTHORIZATION TO CONSTRUCT AND OPERATE Pursuant to the Underground Injection Control Regulations of the U. S. Environmental Protection Agency codified at Title 90 of the Code of Federal Regulations, Parts 124, 144, 146, and 147, Natural Soda, Inc. 818 Taughenbaugh, P.O. Box 1330 Rifle, Colorado 81650 is hereby authorized to construct and operate Class III Solution Mining wells within the proposed Area Permit on its Rock School sodium lease, Rio Blanco County, Colorado (figure 1). The Area Permit (figure 2) is defined as follows: Area Permit within Rock School Lease E1/2 NW1/9 Section 20, W1/2 NEI/9 Section 20 Township 1 South, Range 98 West Rio Blanco County, Colorado This permit authorizes a Class III Solution Mining Well(s) Area Permit for the purpose of extracting the mineral Nahcolite (NaHCO,) by use of a solution mining process (figure 3) with elevated temperature and pressure. Three (3) solution mining wells, wells 2, 3, and 4 of figure 4, are initially approved for construction and operation by issuance of this permit. Injection shall not commence until the operator has fulfilled all applicable conditions of this permit and has received written authorization from the Director. "Prior to Commencing Injection" requirements are set forth in Part II, Section C.1. of this permit. Additional Class III injection wells within this area permit are authorized under 90 CFR 149.33{c)(2), provided the operator notifies the Director prior to construction of the well or wells, submits all information required by this permit, provides a demonstration of financial responsibility to plug and abandon the new well prior to any well construction, and receives written authorization for injection to commence. All conditions set forth herein refer to Title 40 Parts 124, 149, 146, and 197 of the Code of Federal Regulations and are regulations that are in effect on the date that this permit becomes effective. Page 5 of 120 EPA FINAL Area Permit No. C03870-00000