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P C-FIVS 1 <br /> ZZCC-MC=x JAN 14 2021 <br /> DIVISION OF RECLAMATION <br /> Building a better future MINING AND SAFETY <br /> January 11, 2021 <br /> Ms.Amy Eschberger Via FEDEX <br /> Division of Reclamation, Mining and Safety TRK #7725796o 1774 <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 2020 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 fourth quarter of 2020, covering the reporting period from <br /> October 1,202o to December 31, 2020. Table 1 presents data for the last four quarters. <br /> Groundwater samples were collected on November 2, 2020 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 November 3, 2020 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 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 November 2, 2020 groundwater sample were within the <br /> target levels prescribed by TR-12, as shown in Table 1. <br /> APage 1 of 2 <br />