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RECEIVED <br /> ZZCC-MC-X APR 0 4 2019 <br /> IDWOON OFFULWTION <br /> WNWO AND WM <br /> April 3, 2019 <br /> Ms. Amy Eschberger Via FEDEX <br /> Division of Reclamation, Mining and Safety TRK 7748 7245 4470 <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 /> First Quarter 2019 Monitoring Data <br /> Dear Ms. 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 first quarter of 2019, covering the reporting period from <br /> January 1, 2019 to March 31, 2019. Table 1 presents data for the last four quarters. <br /> Groundwater samples were collected on March 15, 2019 from the CEM-oo1 and CEM-004 <br /> groundwater monitoring wells, and from the C-Pit ponded water. The inspection of groundwater <br /> monitoring well CEM-oo5 on March 15th and 18th indicated that there was not enough water volume <br /> 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 are based <br /> on the pH analyses 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 15, 2019 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 gosh 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 1 and consistent with past reports, <br /> the signature for CEM-004 continues to be significantly different from that of C-Pit. <br />