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The measured TDS and calculated TDS for monitoring well M -14 samples collected during the <br />Response Plan are shown in Table 5. Results show ratios to be acceptable and would suggest that <br />'the target constituents reflect the predominant components which compose the TDS. Fide 5 <br />shows the contribution of each individual analyte to the total TDS concentrations found during the <br />Response Plan. Bicarbonate (HCO3) concentrations were calculated by multiplying the alkalinity <br />by 0.61. Nitrate and nitrite are not target constituents under TR -32 and were not analyzed for in <br />the Response Plan, but the ratios in Table 5 show that they must be minor constituents. Results <br />from previous sampling events did not show concentrations of nitrate or nitrite, which would <br />contribute any significant amount to the TDS. <br />4.2 Water Stratification <br />The vertical distribution or stratification of the water quality of well M -14 was evaluated to see if <br />it could provide insights into the mechanisms and processes controlling water quality and provide <br />information indicating the source of constituents. Samples were collected on September 25, 2013 <br />and October 8, 2013, at sample depths of 155, 165 and 175 feet in order to further characterize the <br />vertical profile and the results are shown in Table 6. The results did not indicate either increasing <br />or decreasing significant vertical trends for any of the target analytes, including TDS. <br />4.3 Groundwater Characterization <br />4.3.1 Piper Diagrams <br />Piper diagrams are trilinear representations of the ions found in the water (cations, anions & <br />combined properties) and were used in order to classify water types or chemical facies. The Piper <br />diagrams graphically show the relative concentrations of cations (Ca, Mg, Na +K) and anions (Cl, <br />SO4, HCO3) in solutions. In most natural waters, these six ions make up 95 to 100% of the ions <br />in solution. As shown in Fib, the Piper diagram includes two trilinear diagrams, one for <br />anions (on the lower right) and one for cations (on the lower left), and the information from each <br />trilinear diagram is projected up into the central quadrilateral. <br />Historic groundwater data from monitoring wells M -9, M -12, M -13R, and M -14 were analyzed <br />using Piper diagrams and are shown in Figure 6. For each constituent, the concentration (mg/1) <br />was converted to chemical equivalents (meq /1) based on the electrical charge and atomic weight. <br />TR -32 M -14 TDS Response Plan Report - AES, Inc. <br />Battle Mountain Resources — San Luis, CO 7 January 2015 (Update) <br />