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6 <br /> Well 21-3U <br /> Water Elevation and Dissolved Sodium <br /> 8000 6095 <br /> Numeric Protective Level =6,961.72 mg/L <br /> 7500 i 6094 <br /> CCD C) <br />' . <br />6093 <br /> 7000 <br />E n ° ° ° °0 <br />CO C) Ln <br />P.O 6092 <br />E 6500 0C°O ° ?°v 6091 <br /> <br />0 6000 Co <br />, <br />6090 <br />y <br />d 5500 i 6089 <br /> <br /> 6088 <br />N 5000 <br />G c 6087 <br /> <br />4500 ' <br />i Operational i Temporary <br /> <br />6086 <br /> CO <br />Suspension <br /> 4000 ' <br />!,-?-,-T-,T;r,-?-,-,---?-,- --,--,-?-?---T,-?--_.,---T-? -,?-,---,,,--7- <br />6085 <br /> 0 0 0000 N N N N M M M M? ? It (n (n CO Cp r_ M O O O <br />W O O O O <br />O O O O O 2 O <br />O O O O <br />O O O O O <br />O <br />O O O O <br />R 0 0 0 zz <br /> O Q <br />O \ <br />O <br />O <br />O <br />O <br />O <br />h O O M to to (O CO 7 (f) M 4 M M N N 4 n (f) M O O h (O <br />N <br /> N <br />N <br />N <br />C14 ?z <br />r O- 4 n O 4 r` O V h 0 r V r.- O _ - d' r O- CO N -_ M (O M M <br /> Date <br /> Water Bevation - 0 Sodium, dissolved Sodium Numeric Protective Level <br />Upper Aquifer A Groove Well 21-3A <br />The data for upper aquifer well 21-3A is also indicating an elevated dissolved <br />sodium value during the current monitoring period. The September 2010 value <br />for dissolved sodium is 9240 mg/L. The calculated NPL for this constituent at <br />well 21-3A is 8894 mg/L. The difference between these two values is 346 mg/L. <br />Data from the baseline period shows a mean value of 7933 mg/L and the <br />operational period is represented by a mean value for dissolved sodium of 7804 <br />mg/L. The value for dissolved sodium at well 21-3A has exceeded the calculated <br />NPL one time previously on November 12, 2002 with a value of 9130 mg/L. <br />The historical record of dissolved sodium samples collected versus the ground <br />water elevation at well 21-3A is provided in the following graph.