2011-03-14_REVISION - M1977493 (44)

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CM0002002 • Ground Water Monitoring Program To address the specific ground water monitoring concerns for each of the drainages at the Climax mine site, drainage specific ground water monitoring programs have been developed. Detection Limits and Lab Analysis will follow protocols identified in "EPA Test Methods for Evaluating Solid Waste - Physical/Chemical Methods (SW-846)". Tenmile Creek valley A point of compliance (POC) will be established for the Tenmile Creek valley. The POC for the valley will be monitoring well GWM #2. This well is selected because it is located hydraulically downgradient from the Mayflower treatment plant and existing monitoring well GWM #1 and is close to the NPDES compliance point on Tenmile Creek. In addition, ground water at GWM #2 best represents ground water quality exiting the site and allows for effective evaluation of protections to ground water quality. This determination was made recognizing hydrogeologic conditions at the site and the long-term ground water quality data. This POC, in combination with surface water sampling at Outfall 001, are demonstrative of discharges exiting the Climax property. The ground water quality standards for GWM #2 will be Colorado Basic Ground Water Standards set by the Colorado Water Quality Control Commission in 3.19.0 (5 CCR 1002-8). The ground water monitoring program for the Tenmile Creek POC will consist of the following: • • Water quality samples will be collected from GWM #2 twice annually, once at high flow and once at low flow conditions (March and September). Monitoring well sampling will follow the Sampling and Analysis Plan (SAP) presented in Appendix C and the Climax Mine Environmental Procedures and Training Manual (Cyprus Climax Metals Company, 1995). • Ground water samples will be analyzed for the primary constituents cadmium, copper, iron, lead, manganese, molybdenum, zinc, and cyanide. • Field parameters, pH, Total Dissolved Solids (TDS), and static water level will be recorded during each sampling event. • The ground water sampling results will be reported to the state on a yearly basis with the Annual Reclamation Report. • If an exceedance of the POC ground water standards is detected, the well will be purged and sampled again to verify the exceedance. This will also be followed by four quarterly samples to determine persistence. The results of the ground water sampling program will then be reported to the state. Arkansas River Valley A POC will not be established for the Arkansas River Valley as the valley is located opposite • active facilities west of the Continental Divide. No active mining programs or mining facilities are present within the valley. However, routine ground water monitoring will continue for a