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ZZCGMC-X +V"**" <br />January 14, 2009 <br />R <br />JAN 2 6 70o9 <br />Division of Re&amation, <br />Mining and Safety <br />Mr. David Bird Via Certified Mail 7007 2680 0001 6365 8861 <br />Environmental Protection Specialist Retum Receipt Requested <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 />Technical Revision No. 10, C-Pit Hydrogeoloic Investigations_ <br />4th Quarter 2008 Monitoring Data <br />Dear Mr. Bird: <br />This letter transmits surface water and groundwater data from sampling the C-Pit pond and <br />related wells, in keeping with the requirements of Technical Revision No. 9 to Permit No. M- <br />1977-208. <br />On December 11, 2008, CEMEX sampled the water in the pool at the north end of C-Pit, as well <br />as groundwater from monitoring well CEM-001, the nearest well, and the alluvial well, CEM- <br />004. CEMEX continues to monitor the water elevation in C-Pit and in CEM-001, and to measure <br />the depth to water in compliance well CEM-005 located approximately 2,700 feet southeast of <br />C-Pit along Hygiene Road. Refer to the text, figures, and appendices of the C-Pit Hydrogeologic <br />Investigations report (Brown and Caldwell, August 31, 2007) for site details, well construction, <br />and related information. <br />Analytical Data <br />The C-Pit pond water and groundwater samples taken on December 11 were analyzed for pH, <br />dissolved. selenium, dissolved thallium, chloride, sulfate, and dissolved solids. Table 1 <br />summarizes the results, and the most recent analytical laboratory reports are enclosed with this <br />letter as an attachment. <br />Water Elevation <br />CEMEX continues to monitor the water elevation in the C-Pit pond by using a data logger to <br />record head data. Another data logger is installed in CEM-003. Data is downloaded quarterly, <br />and maintained for informational purposes incase conditions change in the future. <br />Measurement of the depth to water at compliance well CEM-005 on December, 2008 confirmed <br />that this well continues to show no significant change since it was drilled in May 2007. The 400- <br />foot deep well has almost no standing water, which CEMEX believes reflects residual water <br />from well development. As agreed upon in TR-9, we will continue to monitor the depth to water <br />Lyons Plant <br />P.O. Box 529, Lyons, CO 80540. USA, (303) 823-2100, Fax (303) 832-2199