2011-08-08_REVISION - M1977493 (36)

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(Titan, 1994) indicated that the bulk permeability of the bedrock is relatively low and that the • bedrock is not capable of transporting significant quantities of groundwater. • Water Quality Monitoring Plan Climax Molybdenum Company Version: R1 Permit No. M -1977 -493 Additionally, it was shown that the presence of the Mosquito Fault provides a hydraulic barrier to lateral flow of groundwater flow in the bedrock. The direction of groundwater flow is generally coincident with the surface water drainages, where groundwater discharges into streams and creeks. The following sections present a discussion on the hydrogeologic conditions specific to the three watersheds at the Climax mine site. Due to the location of Climax facilities within three different watersheds, each drainage basin is described separately in the following sections of this Plan. The descriptions include hydrogeological setting and selection of monitoring sites. 2.3 Existing Monitoring Network In accordance with the 1995 Groundwater Monitoring Plan submitted as TR -08, Climax has been conducting monitoring of groundwater quality within each of the watersheds at four locations; ARwell in the Arkansas River Watershed; EVMW in the Eagle River Watershed; and GWM -1 and GWM -2 in the Tenmile Creek Watershed. These monitoring wells have generally been sampled quarterly, weather and site conditions permitting, since the submittal of the 1995 Monitoring Plan, and analytical data for this period of record are provided in Appendix A. In accordance with the previous plan, groundwater samples have been analyzed for the following constituents: pH, conductivity, temperature, total dissolved solids (TDS), hardness, sulfate, total cyanide, chloride, and dissolved metals (cadmium, calcium, copper, iron, magnesium, manganese, molybdenum, lead, silver, and zinc). The Climax water management and treatment system treats surface water and underground water collected within the three drainage basins and discharges treated waters into Tenmile Creek at Outfall 001. This surface water discharge is authorized under Colorado Discharge Permit System (CDPS) discharge permit No. CO- 0000248. Surface water sampling at the outfall is performed in accordance with this permit, and is not included in this Plan. Compliance with the discharge requirements demonstrates the overall effectiveness of the collection and treatment protection facilities. EPP — Appendix C August, 2011 3