Laserfiche WebLink
//C G M C-X <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 />July 24, 2013 <br />Via FEDEX <br />TRK 7963 0720 0986 <br />Re: CEMEX Lyons Mine Permit M -1977 -208 <br />Technical Revision No. 11, C -Pit Hydrogeologic Investigations <br />VSecond 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) ponded water and related wells for the second quarter of 2013. In <br />addition to showing data from the last four quarters, Table 1 also presents results of the <br />additional sampling conducted for CEM 004, as well as the expanded list of analytes for C -Pit <br />and CEM 004. <br />On April 8, 2013 water samples were collected from CEM -001 and from the C -Pit ponded water. <br />On April 10, 2013, the quarterly sampling continued for CEM 004. Additional samples were <br />collected from C -Pit and CEM 004 on April 25, 2013, in connection with levels of chloride and <br />sulfate that were observed to be higher than the monitoring goals for CEM 004. Inspection of <br />CEM 005 conducted on June 24, 2013 indicated that the well did not produce water. <br />The C -Pit ponded water and well groundwater samples taken were initially analyzed for pH, <br />chloride, sulfate, dissolved solids, dissolved selenium and dissolved thallium, with the reported <br />pH data based on the pH analysis performed at the time of collection. <br />Laboratory results summarized in Table 1 indicate that, for the second quarter, the analytes were <br />within the target levels for CEM 004, except for Sulfates. Follow up sampling on April 25, 2013 <br />indicated that the sulfate level had decreased to 161 mg/L and were now within monitoring <br />goals. For more information please refer to the submitted separate report dated May 29, 2013 <br />concerning CEM 004 analytes which were higher than the monitoring goals for chloride and <br />Sulfate first noticed in the first quarter of 2013. <br />If there are any questions regarding the above information or the attachments, please contact me <br />at (303) 823 -2115. <br />cerely, <br />Denise ur, Ph.D. <br />Environmental Manager <br />5134 Ute Hwy PO Box 529 <br />Lyon, CO 80540 <br />RECEIVED <br />EnclsA Summary of Analytical Results (Table 1) <br />610 0 2 2013 <br />0jM'SI0N '0F !REC'LWAT11,0 I <br />NNINGAND SAFETY <br />