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RECEIVED <br /> 01 //CC-MC-X FEB 22 2017 <br /> DIVISâ–șoIv of <br /> ' <br /> February 22 2017 M/IUIW'&, rION <br /> Mr. Michael Cunningham Via FEDEX <br /> Division of Reclamation, Mining and Safety TRK#7780 0588 0019 <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 2o16 Monitoring Data <br /> Dear Mr. Cunningham: <br /> This letter transmits the surface water and groundwater data associated with the sampling of cement <br /> kiln dust disposal area (C-Pit). This report includes data from the C-Pit ponded water and related <br /> groundwater monitoring for the fourth quarter of 2o16, covering the reporting period October 1, 2o16 <br /> to December 31, 2o16.Table 1 presents data for the last four quarters. <br /> For the fourth quarter of 2o16, compliance monitoring, water samples were collected on November 8, <br /> 2o16 from CEM-oos and CEM 004 groundwater monitoring wells, and from the C-Pit ponded water. <br /> The initial inspection of groundwater monitoring well CEM o05 on November 8, 2o16 and the follow <br /> up inspection on November 21, 2016 indicated that there was not enough volume of water to collect a <br /> representative sample. <br /> The samples collected from C-Pit ponded water and groundwater wells were analyzed for pH, <br /> chloride, sulfate,total dissolved solids, selenium, and thallium. The reported pH data is based on the <br /> pH analysis performed at the time of sample collection in the field (Table 1). The measured pH at <br /> groundwater monitoring well CEM-004 and analytical results for chloride, sulfate,total dissolved <br /> solids(TDS), selenium and thallium from the November 8, 2016 groundwater sample were below the <br /> target levels prescribed by TR-12, as shown in Table 1. <br /> In addition, a Stiff Diagram, as shown in Fig. s, compares Both percentile and the average of the C-Pit <br /> data with CEM 004 data during the quarter.This diagram indicates that the CEM 004 chemistry is <br /> different from that of C-Pit. <br /> "'I <br />