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//CC-MC-X RE <br /> CE,v'n <br /> JUN 2 0 2017 <br /> DIVISION OF <br /> June 3.5, 203.7 M1NIN0 R.Sq�T1pN <br /> Amy Eschberger Via FEDEX <br /> Division of Reclamation, Mining and Safety TRK #7794 3.482 2485 <br /> Environmental Protection Specialist <br /> 3.33.3 Sherman Street, Room 215 <br /> Denver, Colorado 80203 <br /> Re: CEMEX Lyons Mine Permit M-1977-208 <br /> Technical Revision No. 3.2, Revised Groundwater Monitoring Plan <br /> Second Quarter 2017 Monitoring Data <br /> Dear Amy Eschberger: <br /> This letter transmits the surface water and groundwater data associated with the sampling of the <br /> cement kiln dust disposal area (C-Pit). This report includes data from the C-Pit ponded water and <br /> related groundwater monitoring for the second quarter of 203.7, covering the reporting period from <br /> March 32., 2017 to June 31, 203-7. Table i presents data for the last four quarters. <br /> Compliance monitoring water samples were collected on May 3.7, 203.7 from the CEM-ooi and CEM- <br /> 004 groundwater monitoring wells, and from the C-Pit ponded water. The inspection of groundwater <br /> monitoring well CEM-oo5 on May 3.7, 203.7 indicated that there was not enough water volume to <br /> collect a representative sample. <br /> The samples collected from C-Pit ponded water and the groundwater monitoring wells were analyzed <br /> for pH, chloride, sulfate,total dissolved solids, selenium, and thallium.The reported pH data is based <br /> on the pH analysis performed at the time of sample collection in the field (Table i). The measured pH <br /> at groundwater monitoring well CEM-004 and analytical results for chloride, sulfate,total dissolved <br /> solids(TDS), selenium and thallium from the May 17, 2027 groundwater sample were within the target <br /> 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 <br /> average and 9oth percentile of the cation/anion concentrations from the last four quarterly samples of <br /> C-Pit data is provided in Figure z for reference. As shown in Figure i, and consistent with past reports, <br /> the signature for CEM-004 continues to be significantly different from that of C-Pit. <br />