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1. Description of Mining Activities The Cazbon Junction Mine was a surface coal mining operation located on Ewing Mesa above Durango, Colorado. The mine was an open pit mine designed to mine two to three steeply dipping seams (26 to 30 degrees) within a steady state pit extending to a depth of approximately 180 feet. Planned production was 300,000 tons per yeaz, with an initial anticipated life of five years. Ancillary activities at the mine site included sorting and stockpiling coal, maintenance of mining equipmem, stockpiling and stabilizing topsoil, maimenance and monitoring of the sediment control system, and maimenance and reclamation activities. The mine was initially permitted and opened in 1983 with mining operations continuing until approximately 1988. The mine has been inactive since that time. The total acreage within the mine permit area is 192.77 acres. The total azea of disturbance prior to final reclamation in the spring and summer of 2006 was 37.61 acres. Remaining disturbance includes the sediment control system (diversion ditches, collection ditches, and sediment ponds, accounting for approximately four (4) acres. The mine is located on Ewing Mesa, approximately two miles south of Durango, Colorado. The mine is accessed by a private road to Ewing Mesa from Colorado Highway 3, 1.7 miles north of the intersection of Colorado Highway 3 and U.S. Highway 160/550. 2. Site Map A site map is appended to the SWMP text. 3. Stormwater Management Controls-Identifrcation of Sources and Best Management Practices 3.1 Potential Sources of Pollutants The mine has been reclaimed to the requirements of the CDRMS (formerly CDMG) mining and reclamation permit. There aze no sources of process water on the site. Potential pollutants from the site may include cations and anions from topsoil and/or exposed and weathered bedrock, and sediment from reclaimed and revegetated azeas. There aze no solid or sanitary wastes, pesticides, oil and grease, washout water, construction chemicals, construction debris, or waste metals, rubber, batteries, or wood waste generated from the site. If necessary, and approved by the CDMRS, herbicides may be applied for weed management on revegetated azeas. 3.2 Potential for Contributions to Stormwater Discharges Since development construction, the mine has maimained a sediment control system comprised of clean water diversions, disturbed azea sedimem control ditches, and sediment ponds. This combination of physical controls has proven effective in minimizing the potential for contributions to stormwater dischazges outside the mine site. In the 23+ years of activity at the site, discharges from one or both of the sediment ponds have been recorded less than five times. Quantitative water dischazge sampling in each case showed compliance with CDPS requirements.