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• 1.0 INTRODUCTION <br />Denison Mines (USA) Corp. (Denison) has reopened five underground uranium mines that make up the <br />Sunday Mines. The Sunday Mines are located in southwestern Colorado, on the south side of Big <br />Gypsum Valley in San Miguel County, Colorado. The Sunday Mines are located 17 miles southwest of <br />Naturita, Colorado. On June 20, 2008, Denison was issued Colorado Department of Public Health and <br />Environment (CDPHE) Air Pollution Control Division (APCD) Construction Permits 07SM1140 and <br />07SM1141F for construction of these mines. <br />Based on the permitted uranium ore production rate of 214,000 tons per year, this source is subject to <br />Subpart B of the National Emission Standards for Hazardous Air Pollutants (NESHAP) for underground <br />uranium mines (Underground Uranium Mine NESHAP). This regulation is codified in the Code of <br />Federal Regulations (CFR) 40 CFR 61, Subpart B. <br />This document presents the Underground Uranium Mine NESHAP compliance plan requirements for the <br />Sunday Mines. Denison will ensure the compliance plan meets or exceeds all applicable requirements of <br />40 CFR 61, Subpart B. Section 2.0 of this document describes the mining project. Section 3.0 provides a <br />• summary of the Underground Uranium Mine NESHAP. The proposed compliance plan and <br />recordkeeping requirements are discussed in Section 4.0. References are presented in Section 5.0. <br /> <br />%OdOcuaa and neltiolssmood-d%local actGngsNempolaryimencet filaWk4W.'"y mimcortpiawe plm_dnft.doc <br />1-1