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//66 1 M C- x <br />April 30, 2015 <br />Mr. Michael Cunningham <br />Environmental Protection Specialist <br />-((�= Division of Reclamation, Mining and Safety <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />Via FEDEX <br />TRK 7733 8951 8920 <br />Re: CEMEX Lyons Mine Permit M-1977-208 <br />Technical Revision No. 12, Revised Groundwater Monitoring Plan <br />First Quarter 2015 Monitoring Data <br />Dear Mr. Cunningham: <br />RECEIVED <br />"AY i ! n1,5 <br />DIVISION OF RECLAMATION <br />MINING AND SAFETY <br />This letter transmits surface water and groundwater data associated with the sampling of cement kiln dust disposal <br />area (C -Pit). The report includes data from the C -Pit ponded water and related groundwater monitoring for the first <br />quarter of 2015, covering the reporting period January 1, 2015 to March 31, 2015. Table 1 presents data for the last four <br />quarters. <br />For the first quarter compliance monitoring, water samples were collected on February 24, 2015 from the CEM-oo1 <br />groundwater monitoring well and from the C -Pit ponded water. Water samples from the CEM -004 groundwater <br />monitoring well were collected on February 25, 2015. Inspections of well CEM -005 indicated that the well did not <br />produce any water. <br />The samples collected from C -Pit ponded water and groundwater wells were analyzed for pH, chloride, sulfate, total <br />dissolved solids, selenium, and thallium. The reported pH data is based on the pH analysis performed at the time of <br />collection (Table 1). In addition, a Stiff Diagram of the groundwater cation/anion data from CEM -004 compared to go% <br />of the average cation/anion concentration in C -Pit is provided in Figure 1 for reference. <br />Calcium <br />Magnesium <br />Potassium <br />Sodium <br />Bicarbonate <br />(as CaCO3) <br />Carbonate <br />Chlonde <br />Sulfate <br />CFM OW <br />-7-15 <br />Figure 1: First quarter 2015 cation/anion data for CEM -004 compared to the <br />TR -12 C -Pit Monitoring and Trigger Parameters. <br />