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RECEDED <br /> ,• <br /> ZZCC-MC-x JAN 23 2019 <br /> DIVISION OF REC <br /> INININGgNDTIpN <br /> January 3.5, 203.9 <br /> .� Ms.Amy Eschberger Via FEDEX <br /> Division of Reclamation, Mining and Safety TRK #7743.8872 7020 <br /> Environmental Protection Specialist <br /> 133.3 Sherman Street, Room 23.5 <br /> Denver, Colorado 80203 <br /> Re: CEMEX Lyons Mine Permit M-1977-208 <br /> Technical Revision No. 12, Revised Groundwater Monitoring Plan <br /> Fourth Quarter 2o3.8 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 fourth quarter of 2oi8, covering the reporting period from <br /> October i, 2018 to December 30, 2oi8. Table i presents data for the last four quarters. <br /> Groundwater samples were collected on November 16 and 29, 2oi8 from the CEM-ooi and CEM-004 <br /> groundwater monitoring wells, and from the C-Pit ponded water. The inspection of groundwater <br /> monitoring well CEM-oo5 on November i6, 2o3.8 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 i). 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 November 29, 2o3.8 groundwater sample were within the <br /> target levels prescribed by TR-12, as shown in Table z. <br /> In addition, a Stiff Diagram of the groundwater cation/anion data from CEM-004 compared to the <br /> average and 901h percentile of the cation/anion concentrations from the last four quarterly samples of <br /> C-Pit data is provided in Figure i 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 />