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zzcamax RECENtO <br /> Building a better future AUG 0 3 20 <br /> DMSION OF ION <br /> JulY7, 2021 WNING&SAFETY <br /> Ms. Amy Eschberger Via FEDEX <br /> Division of Reclamation, Mining and Safety TRK #77441823 2987 <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 second quarter of 2021, covering the reporting period from <br /> April 1,2021 to June 30, 2021. Table 1 presents data for the last four quarters. <br /> Groundwater samples were collected on May 17, 2021 from the CEM-ool and CEM-004 groundwater <br /> monitoring wells and from the C-Pit ponded water. The inspection of groundwater monitoring well <br /> CEM-oo5 on May 17, 2021 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 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, 2021 groundwater sample were within the target <br /> levels prescribed by TR-12, as shown in Table 1. <br /> Page 1 of 2 <br />