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October 9, 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 # 7747 0727 4918 <br />Re: CEMEX Lyons Mine Permit M-1977-208 <br />,/Technical Revision No. 12, Revised Groundwater Monitoring Plan <br />Third Quarter 2015 Monitoring Data <br />Dear Mr. Cunningham: <br />RECEIVED <br />OCT 2015 <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 third <br />quarter of 2015, covering the reporting period July 1, 2015 to September 30, 2015. Table 1 presents data for the last four <br />quarters. <br />For the third quarter compliance monitoring, water samples were collected on July 28, 2015 from the CEM-oo1 and CEM <br />004 groundwater monitoring wells, and from the C -Pit ponded water. Inspection of CEM -005 on July 28, 2015 indicated <br />that this compliance well did not 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 (TDS), selenium, and thallium. The reported pH data is based on the pH analysis performed at the time <br />of sample collection, in the field (Table 1). The measured pH at CEM -o04 was within the target levels prescribed by TR - <br />12 as shown on Table 1. The analytical results for chloride, sulfate, total dissolved solids (TDS), selenium, and thallium in <br />June 4, 2015 samples were also within the target levels prescribed by TR -12 as shown on Table 1. <br />In addition, a Stiff Diagram of the groundwater cation/anion data from CEM -o04 compared to 9o% of the average <br />cation/anion concentration in C -Pit is provided in Figure 1 for reference. As shown in Figure 1, the cation/anion signature <br />for CEM -004 continues to be distinctly different from C -Pit, indicating that there is no evidence of C -Pit leakage into the <br />groundwater represented by well CEM -004. <br />�p..e <br />_ CM Rverap <br />� ti."fd U�•�B 2J+5 CEMWa <br />Figure 1: Third Quarter 2015 Cation/Anion Data for CEM -004 compared to the <br />TR -12 C -Pit Monitoring and Trigger Parameters. <br />