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Mr. Michael Cunningham <br />tr <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 />7 Technical Revision No. 11, C -Pit Hydrogeologic Investigations <br />1, 4 Quarter 2011 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 fourth quarter of 2011. For <br />your convenience, data from the last four quarters are also included in Table 1 as an attachment. <br />On December 19, 2011, CEMEX personnel sampled the water in CEM -001 and CEM -004 wells, <br />and the ponded water at the north east 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 (Table 1). The samples were <br />analyzed for pH at the time of collection; this value is reported instead of the laboratory value <br />due to hold time changes that occur in pH values. The samples had no exceedances of the <br />standards. <br />C -pit water pH has increased to 11.7. The sample was collected from the edge of the pond so ice <br />had to be broken in order to collect the sample. CEMEX plans to take additional samples from <br />the center of the pond at depth in order to limit the potential influence from wind -blown cement <br />kiln dust (CKD) on pH. Results of these pH samples will be forwarded in the first quarter 2012 <br />report. For the safety of water fowl, streamers /flagging is still installed across the open water to <br />discourage birds from landing on the C -Pit pond. <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, D. <br />Environmental Manager <br />5134 Ute Hwy PO Box 529 <br />Lyon, CO 80540 <br />Encls.\ Summary of Analytical Results (Table) <br />January 11, 2012 <br />Via Certified Mail <br />Return Receipt Requested <br />7007 2680 0001 6365 9141 <br />RECEIVED <br />NN 13ZO12 <br />Division of Reclamation, <br />Mining & Safety <br />