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//C C-M C-x RECEIVED <br /> OCT 18 2019 <br /> October 15, 2019 <br /> DIVISION OF RECLAMATION <br /> MINING&SAFETY <br /> Ms.Amy Eschberger Via FEDEX <br /> Division of Reclamation, Mining and Safety TRK#7767 3954 7634 <br /> Environmental Protection Specialist <br /> 1313 Sherman Street, ROOM 215 <br /> Denver,Colorado 80203 <br /> Re: CEMEX Lyons Mine Permit M-3-977-208 <br /> Technical Revision No.12, Revised Groundwater Monitoring Plan <br /> Third Quarter 2019 Monitoring Data <br /> Dear Ms. Eschberger: <br /> This letter transmits the surface water and groundwater data associated with the sampling of the cement kiln dust disposal <br /> area(C-Pit). This report includes data from the C-Pit ponded water and related groundwater monitoring for the third <br /> quarter Of 201.9,covering the reporting period from July 1, 2019 to September 30, 201.9. Table i presents data for the last <br /> four quarters. <br /> Groundwater samples were collected on August 6 and September 26, 2019 from the CEM-ooi and CEM-004 groundwater <br /> monitoring wells,and on September 26, 2019 from the C-Pit ponded water. The inspection of groundwater monitoring <br /> well CEM-oo5 on August 6 and August 7, 2019 indicated that there was not enough water volume to collect a <br /> 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 the <br /> time of sample collection in the field(Table a.). The measured pH at groundwater monitoring well CEM-004 and analytical <br /> results for chloride,sulfate,total dissolved solids(TDS),selenium and thallium from the September 26, 2019 groundwater <br /> sample were within the target levels prescribed by TR-12,as shown in Table i. <br /> In addition,a Stiff Diagram of the groundwater cation/anion data from CEM-004 compared to the average and Both <br /> percentile of the cation/anion concentrations from the last four quarterly samples of C-Pit data is provided in Figure 1 for <br /> reference. As shown in Figure i and consistent with past reports,the signature for CEM-004 continues to be significantly <br /> different from that of C-Pit. <br /> LEGEND <br /> C-Pit gM Percentile <br /> 0 C-Pit Average <br /> CEM-004 from 09/26/2019 <br /> Calcium Bicarbonate <br /> (as CaCO3) <br /> Magnesium Carbonate <br /> Potassium <br /> 411111111i; Chloride <br /> Sodium Sulfate <br /> 80 80 40 20 20 40 60 80(meq/L) <br /> Figure 1:Third quarter 2019 cation/anion data for CEM-004 compared to C-Pit <br />