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N,,pk--, RE('F".Pr"n <br />//EC -MC -X July 2 9 2016 <br />July 1, 2016 DIVISION OF RECLAMATION <br />MININGAND SAFETY <br />Mr. Michael Cunningham <br />Division of Reclamation, Mining and Safety <br />Environmental Protection Specialist <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />Re: CEMEX Lyons Mine Permit M-1977-208 <br />Technical Revision No. 12, Revised Groundwater Monitoring Plan <br />Second Quarter 2016 Monitoring Data <br />Dear Mr. Cunningham: <br />Via FEDEX <br />TRK X1 7765 9602 6346 <br />This letter transmits the surface water and groundwater data associated with the sampling of cement kiln dust disposal <br />area (C -Pit). This report includes data from the C. Pit ponded water and related groundwater monitoring for the fourth <br />quarter of 2015, covering the reporting period April 12o16 to June 30, 2o16. Table 1 presents data for the last four <br />quarters. <br />For the second quarter compliance monitoring, water samples were collected on May 16, 2016 from CEM-oo1 <br />groundwater monitoring well and from the C- Pit ponded water, and CEM 004. The initial inspection of groundwater <br />monitoring well CEM 005 on May 16, 2o16, and the follow up inspection (Table 1) indicated that there was not enough <br />volume of water to collect a representative sample. <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 />sample collection in the field (Table 1). The measured pH at CEM -004 and analytical results for chloride, sulfate, total <br />dissolved solids (TDS), selenium and thallium from the May 16, 2o16 sample were within the target levels prescribed by <br />TR -12 as shown in Table 1. <br />In addition, a Stiff Diagram of the groundwater cation/anion data from CEM 004 compared to 9o% of the average <br />cationlanion 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 there is no evidence of C -pit leakage into the <br />groundwater represented by well CEM -004. <br />Figure 1: Second Quarter Cation/Anion data for CEM -004 compared to the <br />TR -12 C -Pit Monitoring and Trigger Parameters. <br />3 <br />oC=_..�.�., <br />Ca$Gkarr <br />elearbonete <br />las CaCO3j <br />Magnesium <br />Carbonate <br />Paasakr <br />Chlo.kie <br />$AW 4ie1 <br />Suvaw <br />3 <br />