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V RECEIVED CCmCX APR 2 4 2018 DIVISION OF RECL4MATIQN April 23,2o18 MINING AND$AFMy Mr. Michael Cunningham Via FEDEX Division of Reclamation, Mining and Safety TRK 78o6 38ol 5650 Environmental Protection Specialist 1313 Sherman Street, Room 215 Denver,Colorado 80203 Re: CEMEX Lyons Mine Permit M-1977-208 Technical Revision No.12, Revised Groundwater Monitoring Plan First Quarter 2oi8 Monitoring Data Dear Mr.Cunningham: This letter transmits the surface water and groundwater data associated with the sampling of the cement kiln dust disposal area(C-Pit). This report includes data from the C-Pit ponded water and related groundwater monitoring for the first quarter of 2o18,covering the reporting period from January 1,2o18 to March 31,2o18. Table 1 presents data for the last four quarters. Compliance monitoring water samples were collected on March 9,2o18 from the CEM-oo1 and CEM-o04 groundwater monitoring wells,and from the C-Pit ponded water. The inspection of groundwater monitoring well CEM-o05 on March 8,2o18 indicated that there was not enough water volume to collect a representative sample. The samples collected from C-Pit ponded water and the groundwater monitoring wells were analyzed for pH,chloride, sulfate,total dissolved solids,selenium,and thallium.The reported pH data is based on the pH analysis performed at the time of sample collection in the field(Table 1). The measured pH at groundwater monitoring well CEM-004 and analytical results for chloride,sulfate,total dissolved solids(TDS),selenium and thallium from the March 9,2o18 groundwater sample were within the target levels prescribed by TR-12,as shown in Table 1. In addition,a Stiff Diagram of the groundwater cation/anion data from CEM-004 compared to the average and 9oth percentile of the cation/anion concentrations from the last four quarterly samples of C-Pit data is provided in Figure 1 for reference. As shown in Figure i and consistent with past reports,the signature for CEM-004 continues to be significantly different from that of C-Pit. LEGEND C-Pit 90' Percentile C-Pit Average CEM-004 from 3/9/2018 Calcium Bicarbonate (as CaCO3) Magnesium Carbonate Potassium Chloride Sodium Sulfate 80 60 40 20 20 40 60 80(meq/L) Figure 1: First quarter 2o18 cation/anion data for CEM-o04 compared to C-Pit