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RECEIVED <br /> ZZCC-MC-x JUL 25 Z019 <br /> DIVIM OF RECLAMATION <br /> J u ly 17, 2019 DINING AND SAFETY <br /> 40 p/e s: Se"91// <br /> Ms. Amy Eschberger Via FEDEX <br /> Division of Reclamation, Mining and Safety TRK#7757 6841.9024 <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 /> Second Quarter 2019 Monitoring Data <br /> Dear Ms. 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 2019, covering the reporting period from <br /> April 1, 2019 to June 30, 2019. Table 1 presents data for the last four quarters. <br /> Groundwater samples were collected on May 1 and May 2, 2019 from the CEM-oo1 and CEM-004 <br /> groundwater monitoring wells, and from the C-Pit ponded water. The inspection of groundwater <br /> monitoring well CEM-oo5 on May 1st 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 <br /> for pH, chloride, sulfate, total dissolved solids, selenium, and thallium. The reported pH data are based <br /> on the pH analyses performed at the time of sample collection in the field (Table 1). 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 1, 2019 groundwater sample were within the target <br /> levels prescribed by TR-12, as shown in Table 1. <br />