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//CG mcx <br />effective if analysis was focused on identifying chloride and sulfate concentrations that were <br />reflective of the C -Pit water signature. Figure 2 is the Stiff Plot representing the average C -Pit <br />concentration and also shows the a reduction in the signature concentrations by 10 percent, (the <br />90 percent Sitff Plot) which CEMEX would like to proposed as the basis for new triggers. The <br />corresponding proposed chloride and sulfate trigger concentrations are shown in Table 2. In <br />other words, the proposed trigger concentrations for chloride and sulfate correspond to 90 <br />percent of the average signature C -Pit concentrations for these two analytes. No changes are <br />proposed for the trigger concentrations of pH, Selenium, Thallium , or Total Dissolved Solids. <br />Table 2 lists the trigger levels that would apply to Compliance Well CEM -005. <br />Figure 1: C -Pit Stiff Plot — Average Cation -Anion Signature <br />Cak , m <br />Magnesium <br />I'uta =suci <br />Sodium <br />100 <br />C -Pit Average Cation -Anion Signature <br />Legend <br />SO 100 <br />Bicarbonate <br />Carbonate <br />Chloride <br />Sw1aIF <br />Table 1: C -Pit Chloride and Sulfate Signature and Average Concentrations for data <br />collected between 2007 -2013 <br />RECEIVED <br />MAR I 12014 <br />United States Operations Division of reclamation, <br />P 0 Box 529, Lyons, CO 80540, USA, Phone (303) 823 -2100, Fax (303) 823 -2199 Mining & Safety <br />Average C -Pit <br />Average C -Pit <br />Analyte <br />Concentration (meq /1 <br />Concentration (mg /1) <br />(see stiff diagram) <br />Chloride <br />33 <br />1,170 <br />Sulfate <br />61 <br />2,934 <br />RECEIVED <br />MAR I 12014 <br />United States Operations Division of reclamation, <br />P 0 Box 529, Lyons, CO 80540, USA, Phone (303) 823 -2100, Fax (303) 823 -2199 Mining & Safety <br />