2015-02-20_HYDROLOGY - M1977208 - Laserfiche WebLink

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//C C- M C- x February 19, 2015 Mr. Michael Cunningham Via FEDEX Environmental Protection Specialist TRK 7729 4298 8090 Td Division of Reclamation, Mining and Safety 1313 Sherman Street, Room 215 Denver, Colorado 80203 Re: CEMEX Lyons Mine Permit M- 1977 -208 / n Technical Revision No.12, Revised Groundwater Monitoring Plan v Fourth Quarter 2014 Monitoring Data DIVISION OF RECLAMATION MINING AND SAFETY Dear Mr. Cunningham: This letter transmits surface water and groundwater data associated with the sampling of cement kiln dust disposal area (C -Pit). The report includes data from the C -Pit ponded water and related groundwater monitoring for the fourth quarter of 2014, covering the reporting period October 1, 2014 to December 31, 2014. Table 1 presents data for the last four quarters. For the fourth quarter compliance monitoring, water samples were collected on December 9, 2014 from CEM -oo1 and CEM -o04 groundwater monitoring wells, and from the C -Pit ponded water. Inspections of well CEM -o05 indicated that the well did not produce any water. The samples collected from C -Pit ponded water and groundwater wells were analyzed for pH, chloride, sulfate, total dissolved solids, selenium, and thallium. The reported pH data is based on the pH analysis performed at the time of collection (Table 1). In addition, a Stiff Diagram of the groundwater cation /anion data from CEM -o04 compared to go% of the average cation/anion concentration in C -Pit is provided in Figure 1 for reference. Calcium Magnesium Potassium Sodium h� � R0 6C L.".d _ C -Pit Average C- Pi190% Average ® 12109/2014 CEM 004 Bicarbonate (as CaCO3) Carbonate Chloride Sulfate 40 20 0 20 40 60 00 mOOlL CEM 004 12109/2014 Figure 1: Fourth quarter cation/anion data for CEM -o04 compared to the TR -12 C -Pit Monitoring and Trigger Parameters.