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Decommissioning Plan Schwartzwalder Mine RML CO-369-06 Cotter Corporation (N.S.L.) 2 March 2017 1.1 Location The Schwartzwalder Mine is located in Section 25, Township 2 South, Range 71 West, 6th Principal Meridian. The site is approximately eight miles northwest of Ralston Reservoir. A location map for the Schwartzwalder Mine is provided in Figure 1. 1.2 Facility Description The mine was an underground uranium mine occupying a portion of the company owned property. The surface area affected by uranium mining operations was limited to 57 of the 562 acres available at the site, with most of the site facilities situated along the floor of Ralston Creek Canyon. The affected surface area included access and haulage roads, material storage and handling locations, parking lots, and physical structures. Generally, the site surface facility layout conformed to the northwest-southeast orientation of the valley floor. The Ore Transfer Pad was located approximately 5 miles southeast of the Mine site. Current and former mine facilities in the vicinity of areas tied to the RML, other than the ore transfer pad, are shown in Figure 2. These RML areas include the ore crusher/sorter (RML #1), the OWTP (RML #2), drying trenches used to dewater residues from early wastewater treatment processes (RML #3), and new water treatment plant (NWTP) (RML #4). Figure 3 shows the location of the NWTP and RML #4, and Figure 4 shows the RML #4 restricted area and license boundary. Descriptions of current or former site facilities and respective functions associated with the RML are as follows. 1.2.1 New Water Treatment Plant (NWTP) – Current Facility The NWTP is located in a topographically elevated area called the mesa, near one of the mine entrances called the “Steve Adit”. This building will contain the IX treatment system to be relocated from the OWTP and also contains a reverse osmosis (RO) treatment train. RO treatment is not considered a licensed activity but is housed in a portion of the NWTP. RML #4 depicts the licensed area as the footprint of the NWTP building. 1.2.2 Old Water Treatment Plant (OWTP) – Current Facility Wastewater treatment for the site prior to 1976 consisted of three shallow settling ponds (Old Ponds), the use of which was abandoned upon construction of a wastewater treatment plant. The Old Ponds Facility was constructed in the late 1960s to remove suspended solids from the mine drainage after it was pumped from the underground workings. The Old Ponds saw the first use of chemical treatment for mine drainage through the addition of barium for radium treatment. Cotter performed this on a trial basis just prior to abandonment of the Facility. The Old Ponds were later buried with sediments in place during construction of the Ore Crusher-Sorter Facility in 1976. A wastewater treatment plant (WWTP) and Barrens Ponds were constructed in 1976 - 1977. The Barrens Ponds were originally installed as the primary sedimentation basins for the WWTP. The 1977-era WWTP was designed to remove uranium, radium and suspended solids from both the mine drainage pumped from the underground workings at the Mine, and surface water runoff