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ZZCC—MC—X OCT o y <br /> DIVISION OF RECI <br /> October 4, 2oi8 MININGAND_" <br /> Ms.Amy Eschberger Via FEDEX <br /> Division of Reclamation,Mining and Safety TRK#778o o58 <br /> Environmental Protection Specialist CEIVFD <br /> 1313 Sherman Street, Room 215 <br /> Denver,Colorado 80203 OCT 0 9 �018 <br /> Re: CEMEX Lyons Mine Permit M-i977-208 DIVISION OF RECLAMATION <br /> Technical Revision No.12, Revised Groundwater Monitoring Plan MINING AND SAFETY <br /> Third Quarter 2018 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 <br /> disposal area(C-Pit). This report includes data from the C-Pit ponded water and related groundwater monitoring for <br /> the third quarter of 2o18,covering the reporting period from July 1, 2oi8 to September 30,2018. Table i presents data <br /> for the last four quarters. <br /> Compliance monitoring water samples were collected on September i7,2oi8 from the CEM-ooi and CEM-o04 <br /> groundwater monitoring wells,and from the C-Pit ponded water. The inspection of groundwater monitoring well CEM- <br /> oo5 on September 17,2oi8 indicated that the well was dry and therefore no water sample could be collected. <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 is based on the pH analysis 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 September i7,2018 <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-oo4 compared to the average and 901h <br /> percentile of the cation/anion concentrations from the last four quarterly samples of C-Pit data is provided in Figure i <br /> for reference. As shown in Figure i and consistent with past reports,the signature for CEM-004 continues to be <br /> significantly different from that of C-Pit. <br /> LEGEND <br /> - C-Pit901Percentile <br /> 0 C-Pit Average <br /> CEM-004 from 9/17/2018 <br /> Calcium Bicarbonate <br /> (as CaCO3) <br /> Magnesium Carbonate <br /> Potassium Chloride <br /> Sodium < Sulfate <br /> 80 60 40 20 20 40 60 80(meq/L) <br /> Figure 1:Third quarter 2018 cation/anion data for CEM-004 compared to C-Pit <br />