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ZZCC—MC—x <br /> Building a better future <br /> October 4, 2021 <br /> —4s. Amy Eschberger Via FEDEX <br /> Division of Reclamation, Mining and Safety TRK #7748 6230 7438 <br /> Environmental Protection Specialist <br /> 1313 Sherman Street, Room 215 <br /> Denver, Colorado 80203 <br /> Re: CEMEX Lyons Mine Permi M 77-208 , <br /> Technical Revision No. 12, roundwater Monitoring Plan <br /> Third Quarter 2021 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 third quarter of 2021, covering the reporting period from July <br /> 1,2021 to September 30, 2021. Table 1 presents data for the last four quarters. <br /> Groundwater samples were collected on August 11 and 12, 2021 from the CEM-ool and CEM-004 <br /> groundwater monitoring wells and from the C-Pit ponded water. The inspection of groundwater <br /> monitoring well CEM-oo5 on 12 August 2021, 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 11 August 2021 groundwater sample were within the <br /> target levels prescribed by TR-12, as shown in Table 1. <br /> 1 <br /> Page 1 of 2 <br />