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ZZCC-MC-x <br /> July 5, 2o18 <br /> Amy Eschberger Via FEDEX <br /> Division of Reclamation, Mining and Safety TRK #7726 2963 8633 <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 2oi8 Monitoring Data <br /> Dear Amy Eschberger: <br /> This letter transmits the surface water and groundwater data associated with the sampling of the <br /> cement kiln dust disposal area (C-Pit). This report includes data from the C-Pit ponded water and <br /> related groundwater monitoring for the second quarter of 2oi8, covering the reporting period from <br /> April 1, 2o18 to June 30, 2o18. Table i presents data for the last four quarters. <br /> Compliance monitoring water samples were collected on May 9, 2o18 from the CEM-oo1 and CEM- <br /> 004 groundwater monitoring wells, and from the C-Pit ponded water. The inspection of groundwater <br /> monitoring well CEM-oo5 on May 8th, May 21st, June 15th, and June 20th of 2o18 indicated that there <br /> was not enough water volume to collect a representative sample. <br /> The samples collected from C-Pit ponded water and the groundwater monitoring wells were analyzed <br /> for pH, chloride, sulfate,total dissolved solids, selenium, and thallium.The reported pH data is based <br /> on the pH analysis performed at the time of sample collection in the field (Table 1). The measured pH <br /> at groundwater monitoring well CEM-004 and analytical results for chloride, sulfate,total dissolved <br /> solids (TDS), selenium and thallium from the March 9, 2o18 groundwater sample were within the <br /> target levels prescribed by TR-12, as shown in Table 1. <br /> In addition, a Stiff Diagram of the groundwater cation/anion data from CEM-004 compared to the <br /> average and 9oth percentile of the cation/anion concentrations from the last four quarterly samples of <br /> C-Pit data is provided in Figure 1 for reference. As shown in Figure i and consistent with past reports, <br /> the signature for CEM-004 continues to be significantly different from that of C-Pit. <br />