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3 <br />Sample Date <br />Alluvial Well 21 -5 <br />Dissolved Sodium (mg /L) <br />Early Warning Indicator <br />498 <br />November 18, 2012 <br />529 <br />March 11, 2013 <br />524 <br />June 3, 2013 <br />503 <br />November 18, 2013 <br />514 <br />The historical record of dissolved sodium samples versus the ground water <br />elevation at down - gradient alluvial well 21 -5 is provided in the following <br />hydrograph: <br />Well 21 -5 (Alluvial Completion) <br />Water Elevation and Dissolved Sodium <br />550 m N <br />525 Early Warning Indicator = 498 mg /L q) <br />500 <br />475 <br />450 <br />425 vv � v T� v ; <br />0 400 <br />0 375 <br />m <br />c 350 <br />Ln 325 -� <br />300 <br />c� <br />275 - 00 Operational <br />250 <br />v <br />_L0 <br />o `n rn <br />"' 4 v R/ <br />Temporary <br />Suspension <br />6040 <br />i 6039 <br />6038 <br />6037' <br />6036 <br />60351 <br />6034' <br />6033' <br />6032 <br />6031 <br />- 6030 <br />�w�rcvwrw��avun�w�— wunw��wun ;:� w <br />Date � <br />Water Elevation — 0 Sodium, dissolved —Sodium Early Warning Indicator <br />The seasonal water level variation coordinates somewhat with fluctuations in the <br />concentration of dissolved sodium. The cation /anion balance calculated for the <br />