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4 <br /> <br />Date of Sample Alluvial Well 21-5 <br />Dissolved Sodium <br />(mg/L) <br />April 22, 2002 505 <br />January 19, 2004 500 <br />June 21, 2004 518 <br />September 10, 2004 520 <br />June 13, 2007 505 <br />June 11, 2008 517 <br />September 16, 2010 499 <br />The historical record of dissolved sodium samples collected versus the ground <br />water elevation at alluvial well 21-5 is provided in the following hydrograph. <br />Well 21-5 (Alluvial Completion) <br />Water Elevation and Dissolved Sodium <br />550 w o n 6040 <br /> <br />525 04 <br />Early Warning Indicator = 498 mglL <br />1O U') 0 "' <br /> ? <br />M 6039 <br />500 ' <br />.. 6038 <br />475 <br />450 h <br /> <br />v <br />m vas 6037 <br />E <br />425 LO <br /> <br />L"t LO LO <br /> <br /> <br />036 <br /> <br />0 400 6035 <br /> <br />0 375 ; 6034 <br />c 350 <br /> 6033 <br />N <br />325 <br />_ <br />300 Temporary 6032 <br />275 Suspension <br />Operational - <br />6031 <br />250 <br />-? ??- 6030 <br />0 0 0 0 0 0 r z- N N N N M M M M't V"t ? Lo 0 co O r- M M O O <br />0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2222 0 0 0 0 0 <br /> <br />N N N 0 <br />0 W f: (O In In W CD N t` f` <br />N N <br />O O <br />W O M 61 m N <br />_ <br />__ <br />N N <br />N <br />N N <br />N N ?- ? M N O <br />h O r a V O Fz a h 0 "z O_ 0 m CO M <br />r r r r a r r <br />Date <br />Water Elevation -0 Sodium, dissolved Sodium Early Warning Indicator