2015-09-02_HYDROLOGY - M1977208 - Laserfiche WebLink

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0� September 1, 2015 Mr. Michael Cunningham Via FEDEX Environmental Protection Specialist TRK 7743 4438 7899 Division of Reclamation, Mining and Safety 1313 Sherman Street, Room 215 Denver, Colorado 80203 Re: CEMEX Lyons Mine Permit M-1977-208 Technical Revision No.12 Revised Groundwater Monitoring Plan ✓ Second Quarter 2015 Monitoring Data Dear Mr. Cunningham: RECEIVED III Sr -r' u Z ZU15 DIVISION OF RECLAMATION, MINING AND SAFETY 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 second quarter of 2015, covering the reporting period April 1, 2015 to June 30, 2015. Table 1 presents data for the last four quarters. For the second quarter compliance monitoring, water samples were collected on June 4, 2015 from the CEM-oo1 and CEM 004 groundwater monitoring wells, and from the C -Pit ponded water. Inspection of CEM-oo5 on May 29, 2015 indicated that this compliance 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 (TDS), selenium, and thallium. The reported pH data is based on the pH analysis performed at the time of sample collection, in the field (Table 1). The measured pH at CEM -o04 was within the target levels prescribed by TR - 12 as shown on Table 1. The analytical results for chloride, sulfate, total dissolved solids (TDS), selenium, and thallium in June 4, 2015 samples were also within the target levels prescribed by TR -12 as shown on Table 1. In addition, a Stiff Diagram of the groundwater cation/anion data from CEM -004 compared to go% of the average cation/anion concentration in C -Pit is provided in Figure 1 for reference. As shown in Figure 1, the cation/anion signature for CEM -004 continues to be distinctly different from C -Pit, indicating that there is no evidence of C -Pit leakage into the groundwater represented by well CEM -o04 - Calcium Magnesium Potassium Sodium Bicarbonate (as CaCO3) Carbonate Chloride Sulfate ae.a-eons Figure t: Second Quarter 2015 Cation/Anion Data for CEM -o04 compared to the TR -12 C -Pit Monitoring and Trigger Parameters.