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3 <br />The seasonal water level variation does not correlate closely with fluctuations in <br />the concentration of dissolved sodium. The historical record of dissolved sodium <br />samples versus the ground water elevation at alluvial well 21 -5 is provided in the <br />following hydrograph: <br />550 1, <br />525 J <br />500 — <br />475 <br />450 <br />425 <br />6 400 <br />C <br />v 375 - <br />d <br />c 350 - <br />_y 325 <br />300 - 'u <br />D) <br />C° <br />250 <br />i <br />Well 21 -5 (Alluvial Completion) <br />Water Elevation and Dissolved Sodium <br />C) <br />Early Warning Indicator = 498 mg /L o 'f' "' o U') rn <br />CUD) <br />v� v v v v cam <br />Temporary <br />Suspension <br />Operational <br />6040 <br />6039 <br />N <br />6038 <br />0 <br />r 6037 <br />r <br />6036 <br />6035 <br />6034 <br />6033 <br />6032 <br />6031 <br />6030 <br />Date <br />Water Elevation —0 Sodium, dissolved —Sodium Early Warning Indicator <br />The cation /anion balance for the March 11, 2013 sample from alluvial well 21 -5 is <br />2 %. The sum of the anions and cations measured from this sample are 34.6 <br />meq /L and 36 meq /L, respectively. Conductivity (2800 umhos /cm) and total <br />dissolved solids (2000 mg /L) were both representative of historical values and <br />below EWI range. The values for all other indicator parameters analyzed were <br />below the EWI levels showing no marked corresponding increase. Data validation <br />and QA/QC samples indicate no apparent laboratory or sampling issues. <br />Monitoring of alluvial well 21 -5 will continue on a quarterly frequency. <br />