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Decommissioning Plan Schwartzwalder Mine <br /> <br /> <br />RML CO-369-06 <br />Cotter Corporation (N.S.L.) 5 March 2017 <br />Table 1: RML #1 Post-excavation, pre-backfill/grading Soil Sampling Results <br /> <br />1.3.3 Drying Trench Decommissioning <br />Contaminated soils at the drying trenches (RML #3) were also cleaned up as part of licensed <br />facilit y decommissioning efforts. Cleanup activities for the Drying Trenches were completed by <br />January, 2002 (Cotter, 2003) in accordance with Cotter Environmental Report, Exhibit P, Trench <br />and Old Ponds Decommissioning Plan, March 1998. <br /> <br />Soil samples and gamma surveys were utilized to characterize RML #3 for cleanup beginning in <br />May of 1998. The majority of the potentially contaminated soils were then removed and shipped <br />to the Mill facility in 1998. Activity at this cleanup area was limited in 1999 because <br />decommissioning efforts were focused on the demolition of the Ore Crusher-Sorter primary- <br />process building. The CDPHE performed a gamma survey of this cleanup area in 2001 <br />(CDPHE, 2001c). Decommissioning of the Drying Trench area was considered complete by <br />2002 (Cotter, 2003). A successfully decommissioned status for RML #3 is supported by soil <br />sampling data collected in 2000 (Figure 5), a gamma survey conducted by Tetra Tech in 2007, <br />and soil samples collected by Cotter in 2008 (see Figure 6 and Table 2 in Section 2.5 of this <br />decommissioning plan). <br /> <br />1.3.4 Wastewater Treatment Plant Decommissioning <br />Procedure 3-15 Wastewater Treatment Facility Decommissioning Plan, 18 September 2000, was <br />approved by the predecessor to Radiation Management Unit of the CDPHE, with the exception <br />of soil cleanup standards (CDPHE, 2001b). Removal of the Emergency Storage Pond began in <br />October of 2000, and the bulk of the waste-rock-fill banks was removed from the pond structure <br />and hauled to the onsite waste dumps for disposal. All sediments were removed and transported <br />to the Mill for disposal. <br />Sample Sampling Ra-226 U-nat <br />ID Date (pCi/g)(pCi/g) <br />S12602 OS16 7/11/2001 1.6 7.4 <br />S12603 OS32 7/11/2001 2.4 10.8 <br />S12604 OS36 7/11/2001 1.9 8.7 <br />S12605 OS42 7/11/2001 5.8 28.0 <br />S12606 OS52 7/11/2001 2.4 15.5 <br />S12829 9/13/2001 2.3 10.8 <br />S12830 9/13/2001 1.2 16.9 <br />S12831 9/13/2001 7.2 40.6 <br />S12832 9/13/2001 1.6 39.9