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4 r. Michael Cunningham <br />Environmental Protection Specialist <br />Division of Reclamation, Mining and Safety <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />October 24, 2011 <br />Via Certified Mail <br />Return Receipt Requested <br />7009 3410 0002 0993 8702 <br />Re: CEMEX Lyons Mine Permit M -1977 -208 <br />Technical Revision No. 10, C -Pit Hydrogeologic Investigations <br />i rr i Quarter 2011 Monitoring Data <br />ReCeive <br />OCT 26 2011 <br />to Division of R eclamation Mining & Safety , <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 2011. For <br />your convenience, data from four past quarters are also included in Table 1. <br />On August 18, 2011, CEMEX personnel sampled the water in CEM -001 and CEM -004 wells, <br />and the ponded water at the north end of C -Pit. <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. Analytical laboratory <br />results for the most recent and four pervious quarters are enclosed with this letter, as an <br />attachment. The samples were analyzed shortly after collection for pH; this value is reported <br />instead of the value by the laboratory due to hold time changes that occur in pH values. <br />If there are any questions regarding the above information or the attachments, please contact me <br />at (303) 823 -2115. <br />Sincerely, <br />Denise Arthur, PIi D. <br />Environmental Manager <br />5134 Ute Hwy PO Box 529 <br />Lyon, CO 80540 <br />Encls.\ Summary of Analytical Results (Table) <br />