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ZZCGMGX � <br /> Building a better future JAN > p 2022 <br /> 2022 DIVISION OF RECLAMATION, <br /> January 4, MINING&SAFETY-MINERALS <br /> Ms.Amy Eschberger <br /> Environmental Protection Specialist Via FEDEX <br /> Division of Reclamation, Mining and Safety TRK #7755 9179 2050 <br /> Room 215 <br /> iooi E 62nd Ave <br /> Denver, CO 80216 <br /> Re: CEMEX Lyons Mine Permit M-1977-208 <br /> Technical Revision No. 12, Revised Groundwater Monitoring Plan <br /> Fourth 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 fourth quarter of 2021, covering the reporting period from <br /> October 31,2021 to December 31, 2021. Table 1 presents data for the last four quarters. <br /> Groundwater samples were collected on November 10, 2021, 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 10,2021 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). Except for the <br /> measured pH at groundwater monitoring well CEM-004 which was above the CEM oo5 trigger value of <br /> 8.5 s.u.,the analytical results for chloride, sulfate,total dissolved solids(TDS), selenium and thallium <br /> from the November 10, 2021 groundwater sample were within the target levels prescribed by TR-12, <br /> as shown in Table 1. <br /> Page 1 of 2 <br />