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RECEIVE® <br /> //CCmCx FEB 0 5 2016 <br /> February 5,Zo�6 DMONOF RECLAMATION <br /> PIING AND SAFETY <br /> Mr.Michael Cunningham Via FEDEX <br /> Division of Reclamation, Mining and Safety TRK#7755 7174 2775 <br /> Environmental Protection Specialist <br /> 13i3 Sherman Street, Room 2i5 <br /> Denver,Colorado 80203 <br /> Re: CEMEX Lyons Mine Permit M-i977-208 <br /> Technical Revision No.i2, Revised Groundwater Monitoring Plan <br /> Fourth Quarter 2015 Monitoring Data <br /> Dear Mr.Cunningham: <br /> This letter transmits the surface water and groundwater data associated with the sampling of cement kiln dust disposal <br /> area(C-Pit).This report includes data from the C-Pit ponded water and related groundwater monitoring for the fourth <br /> quarter of 2015,covering the reporting period October 1,2015 to December 3i,2015.Table i presents data for the last <br /> four quarters. <br /> For the fourth quarter compliance monitoring,water samples were collected on October 6,2015 from CEM-ooi and <br /> CEM 004 groundwater monitoring wells,and from the C-Pit ponded water.The initial inspection of groundwater <br /> monitoring well CEM 005 on October 6,2015,and follow up inspections(Table 1)indicated that there was not enough <br /> volume of water to collect a representative sample. <br /> The samples collected from C-Pit ponded water and groundwater wells were analyzed for pH,chloride,sulfate,total <br /> dissolved solids,selenium,and thallium.The reported pH data is based on the pH analysis performed at the time of <br /> sample collection in the field(Table 1). The measured pH at CEM-o04 was within the target levels prescribed by TR-i2 as <br /> shown in Table 1. The analytical results for chloride,sulfate,total dissolved solids(TDS),selenium and thallium in <br /> October 6,2105 samples were also within the target levels prescribed by TR-i2 as shown in Table 1. In addition,a Stiff <br /> Diagram of the groundwater cation/anion data from CEM 004 compared to go%of the average cation/anion <br /> concentration in C-Pit is provided in Figure i for reference. As shown in Figure i,the cation/anion signature for CEM-004 <br /> continues to be distinctly different from C-Pit,indicating there is no evidence of C-pit leakage into the groundwater <br /> represented by well CEM-004. <br /> �4 <br /> LPU A.'wsA <br /> ��^' LA190V.Average <br /> CEM OM101U9.]Ot5 <br /> Calcium Bicarbonate <br /> (as CaCO3) <br /> Magnesium Carbonate <br /> Potassium Chloride <br /> a <br /> Sodium Sulfate <br /> t!M 00t <br /> OMG10t5 <br /> Figure 1: Fourth quarter cation/anion data for CEM-004 compared to the <br /> TR-12 C-Pit Monitoring and Trigger Parameters. <br />