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RECEIVED <br /> ZZCC-MC-X DEC 17 2019 <br /> UftON OF RECLAMAnay <br /> December 16,2o1g UNWG AND SAFETY <br /> Ms.Amy Eschberger Via FEDEX <br /> Division of Reclamation, Mining and Safety TRK#7772 56588776 <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 /> Fourth Quarter 2019 Monitoring Data <br /> Dear Amy Eschberger: <br /> This letter transmits the surface water and groundwater data associated with the sampling of the cement kiln dust <br /> disposal area(C-Pit). This report includes data from the C-Pit ponded water and related groundwater monitoring for <br /> the fourth quarter of 2019,covering the reporting period from October 1, 2019 to December 31,2019. Table 1 presents <br /> data for the last four quarters. <br /> Groundwater samples were collected on November 13,2019 from the CEM-oo1 and CEM-004 groundwater monitoring <br /> wells and from the C-Pit ponded water. The inspection of groundwater monitoring well CEM-005 on November 13 and <br /> November 14,2019 indicated that there 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 for pH,chloride, <br /> sulfate,total dissolved solids,selenium,and thallium.The reported pH data are based on the pH analyses performed at <br /> the time of sample collection in the field(Table 1). The measured pH at groundwater monitoring well CEM-004 and <br /> analytical results for chloride,sulfate,total dissolved solids(TDS),selenium and thallium from the November 13,2019 <br /> groundwater sample were within the 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 average and got' <br /> percentile of the cation/anion concentrations from the last four quarterly samples of C-Pit data is provided in Figure 1 <br /> for reference. As shown in Figure 1 and consistent with past reports,the signature for CEM-o04 continues to be <br /> significantly different from that of C-Pit. <br /> LEGEND <br /> C-Pit 90"'Percentile <br /> 0 C-Pit Average <br /> CEM-004 from 11/13/2019 <br /> Calcium Bicarbonate <br /> (as CaCO3) <br /> Magnesium Carbonate <br /> Potassium <br /> Chloride <br /> Sodium Sulfate <br /> 80 60 40 20 20 40 60 80(meq/L) <br /> Figure 1: Fourth quarter 2019 cation/anion data for CEM-o04 compared to C-Pit <br />