Laserfiche WebLink
rq\P1C`i <br />June 24, 2016 <br />Mr. Michael Cunningham <br />Division of Reclamation, Mining and Safety <br />Environmental Protection Specialist <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />RECFIVFD <br />JUN 2 8 2016 <br />DIVISION OF RECLAMATION <br />MINING AND SAFETY <br />Re: CEMEX Lyons Mine Permit M-1977-208 1-'' <br />a Technical Revision No. 12, Revised Groundwater Monitoring Plan <br />First Quarter 2016 Monitoring Data <br />Dear Mr. Cunningham: <br />Via FEDEX <br />TRK ## 7764 6758 8566 <br />This letter transmits the surface water and groundwater data associated with the sampling of cement kiln dust disposal <br />area (C -Pit). This report includes data from the C -Pit ponded water and related groundwater monitoring for the fourth <br />quarter of 2015, covering the reporting period January 1, 2016 to March 31, 2oi6. Table i presents data for the fast four <br />quarters. <br />For the first quarter compliance monitoring, water samples were collected on March 16, 2oi6 from CEM-oo1 <br />groundwater monitoring well and from the C -Pit ponded water, sample from CEM 004 groundwater monitoring well <br />was collected on March 21, 2o16. The initial inspection of groundwater monitoring well CEM 005 on March 14,2oi6 and <br />follow up inspections (Table 1) indicated that there was not enough volume of water to collect a representative sample. <br />The samples collected from C -Pit ponded water and groundwater wells were analyzed for pH, chloride, sulfate, total <br />dissolved solids, selenium, and thallium. The reported pH data is based on the pH analysis performed at the time of <br />sample collection in the field (Table 1). The measured pH at CEM -004 and analytical results for chloride, sulfate, total <br />dissolved solids (TDS), selenium and thallium from the March 21, 2016 sample were within the target levels prescribed <br />by TR -12 as shown in Table 1. <br />In addition, a Stiff Diagram of the groundwater cationlanion data from CEM 004 compared to go% of the average <br />cation/anion concentration in C -Pit is provided in Figure 1 for reference. As shown in Figure 1, the cation/anion signature <br />for CEM -o04 continues to be distinctly different from C -Pit, indicating there is no evidence of C•pit leakage into the <br />groundwater represented by well CEM -004. <br />Figure 1: First Quarter Cation/Anion Data for CEM -004 compared to the <br />TR -12 C -Pit Monitoring and Trigger Parameters. <br />En1.4..-y.• <br />CAm <br />Bkwbonele <br />(ae CaCQ71 <br />14�num • <br />rte... <br />