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//CC-MC-X <br />/Mr. Michael Cunningham <br />r/ Environmental Protection Specialist <br />Division of Reclamation, Mining and Safety <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />October 14, 2013 <br />Via FEDEX <br />TRK 7969 0805 8279 <br />J <br />Re: CEMEX Lyons Mine Permit M- 1977 -208 <br />Technical Revision No. 11, C -Pit Hydrogeologic Investigations <br />` -Third Quarter 2013 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). The report covers the C -Pit ponded water and related monitoring <br />well water for the third quarter of 2013, covering the reporting period July 1, 2013 to September <br />30, 2013. Table 1 presents data for the last four quarters, including additional sampling <br />occurrences conducted in previous quarters. <br />For the third quarter compliance monitoring water samples were collected on August 22, 2013 <br />from CEM -001, CEM 004, and from the C -Pit ponded water. The C -Pit ponded water and well <br />groundwater samples taken were analyzed for pH, chloride, sulfate, dissolved solids, dissolved <br />selenium and dissolved thallium, with the reported pH data based on the pH analysis performed <br />at the time of collection (Table 1). <br />All CEM 004 analytes were below target levels with selenium and thallium below detectable <br />limits at 0.0008 mg/l. Inspection of CEM 005 for the third quarter was conducted on September <br />30, 2013 indicated that the well did not produce any water. <br />If there are any questions regarding the above information or the attachments, please contact me <br />at (303) 823 -2115. <br />cerely, <br />D ise Arthur, Ph.D <br />Environmental Manager <br />5134 Ute Hwy PO Box 529 RECEIVED <br />Lyon, CO 80540 <br />Encls.\ Summary of Analytical Results (Table 1) �"o V 0 1 Z 0 1 <br />Division of Reclamation, <br />Mining & Safety <br />