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f/CEmEX <br />Mr. Michael Cunningham <br />Environmental Protection Specialist <br />Division of Reclamation, Mining and Safety <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />Re: CEMEX Lyons Mine Permit M -1977 -208 <br />Technical Revision No. 11, C -Pit Hydrogeologic Investigations <br />Third Quarter 2012 Monitoring Data <br />Dear Mr. Cunningham: <br />This letter transmits surface water and groundwater data associated with the sampling of cement <br />kiln dust disposal area (C -Pit) ponded water and related wells for the third quarter of 2012. For <br />your convenience, data from the last four quarters are also included in Table 1 as an attachment. <br />Water sampling was conducted in Mid -July, no exceedances were found. Water samples were <br />collected from CEM -001, CEM -004 wells, and from the C -Pit ponded water. CEM 005 did not <br />produce any water. <br />The C -Pit ponded water and well groundwater samples taken were analyzed for pH, chloride, <br />sulfate, dissolved solids, dissolved selenium and dissolved thallium. The samples were analyzed <br />for pH at the time of collection; this value is reported instead of the laboratory value due to hold <br />time changes that occur in pH values. Laboratory results summarized in Table 1 indicate that the <br />analytes were within the target levels. <br />If there are any questions regarding the above information or the attachments, please contact me <br />at (303) 823 -2115. <br />S' cerel <br />D <br />Ph. D. <br />Environmental Manager <br />5134 Ute Hwy PO Box 529 <br />Lyon, CO 80540 <br />Encls.\ Summary of Analytical Results (Table 1) <br />September 15, 2012 <br />Via Certified Mail <br />Return Receipt Requested <br />7011 0470 0002 0359 4122 <br />