2015-04-17_REPORT - M1977004 (2)

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Pitch Reclamation Project Colorado Mined Land Reclamation Board — 2014 Annual Reclamation Re • Monitored of pit wall slopes on the south and east walls of the North Pit, the east wall of the South Pit and the Indian and Tie Camp rock dumps; • Monitored the groundwater levels in piezometers in the area of Pinnacle workings and monitored springs and seeps potentially influenced by; the re- saturation of the historical underground workings; • Monitored piezometers in both the Indian and Tie Camp rock dumps; I • Monitored tension cracks above the east wall of the North Pit; I • Continued noxious weed control and continued removal of small pine trees that encroached on the downstream face of the sediment control embankment; • Monitored monuments and piezometers on the sediment pond embankment per the requirements of the Colorado Division of Water Resources; • Completed a land exchange effective January 30, 2014 with the Gunnison National Forest for 700.4 acres of federal land within, and adjacent to, the Pitch Reclamation Project. The land was transferred to HMC as fee simple with both surface and mineral rights. Additionally, two 4000 gallon fuel tanks were removed from the Pitch s t ite and hauled offsite. In 2013, the Water Quality Control Commission issued a Seasonal Type B Temporary Modification on Segment 20 (Indian Creek). The modification was intended to provide sufficient time to determine the "lowest practical level" (LPL) of uranium discharged to Indian Creek at the discharge permit point of compliance (SW -33). In 2014, HMC implemented a plan to assess both natural and human - induced sources of uranium to support evaluation of mitigation options that are practical and technically and economically feasible. A conceptual site model (CSM) was developed for the Pitch Reclamation Project to document the natural and anthropogenic sources of uranium as well as the geochemical processes that control uranium concentrations within the Pitch footprint in surface water and groundwater. A summary of the CSM was provided to the WQCD on August 12,:2014. The CSM was used as the basis for an alternatives evaluation to begin determining the LPL and associated best management practices (BMPs) that can be implemented to reduce the uranium loading to Indian Creek. This information is provided for introductory purposes; details of 2014 monitoring, closure and reclamation activities are presented in the following sections. I � I Pitch 2014 Reclamation Report 16Apol2D15_Ciw. Docx I ES -2