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f) V 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 />Dear Mr. Cunningham: <br />July 24, 2011 <br />Via Certified Mail <br />Return Receipt Requested <br />7007 2680 0001 6296 0118 <br />Re: CEMEX Lyons Mine Permit M -177 -208 <br />Technical Revision No. 10, C -Pit Hydrogeologic Ifvestigations <br />2 " Quarter 2011 Monitoring Data <br />RECEIVED <br />AUG 02 2011 <br />Division of Reclamation, <br />Mining & Safety <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 2011. <br />For your convenience, data from four past quarters are also included in Table 1. <br />On June 17, 2011, CEMEX personnel sampled the water in CEM -001, and CEM -004 wells, and <br />the ponded water at the north end of C -Pit. CEMEX also monitored the water elevation in C -Pit. <br />For site details, well construction, and related historical information please refer to the text, The <br />C -Pit Hydrogeologic Investigations Report (Brown and Caldwell, August 31, 2007) <br />C -Pit water continues to be used in the manufacturing process and is pumped into a cooling <br />tower to reduce the C -Pit water level. The ponded water in C -Pit fluctuates with process use as <br />can be seen in the attached C -Pit Water Level Elevation graph from 7 -1 -11 to 7- 31 -11. The y <br />axis on the graph corresponds to the water surface elevation. As can be noted on the graph water <br />levels were pumped down 7 -6 -11 to the lowest possible levels, within the constraints of the <br />pump mounting system. <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 />