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In addition, a Stiff Diagram of the groundwater cation/anion data from CEM-004 compared to the <br /> average and 901h percentile of the cation/anion concentrations from the last four quarterly samples of <br /> C-Pit data is provided in Figure z for reference. As shown in Figure i and consistent with past reports, <br /> the signature for CEM-004 continues to be significantly different from that of C-Pit. <br /> LEGEND <br /> C-Pit gl7"Percentile <br /> Q C-PdAverage <br /> CEM-004 from 302021 <br /> C aluum Bicarbonate <br /> (as CaCO3) <br /> Magnesium Carbonate <br /> Potassium Chloride <br /> Sodium Sulfate <br /> 90 72 54 36 18 18 36 54 72 90 (meq/L) <br /> Figure 1: First quarter 2o21 cation/anion data for CEM-o04 compared to C-Pit <br /> Please contact me at 303-823-2124 or by email at scotta.harcus@cemex.com for any questions or <br /> concerns regarding this submittal. <br /> Sinc ely, <br /> Scott A. Harcus <br /> Environmental Manager <br /> Encs.Y21Q1 C-Pit Monitoring Report and associated Stiff Plot(Fig.1),and Summary of Analytical Results(Table 1) <br /> Page 2 of 2 <br />