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3 <br />Well 21-5 (Alluvial Completion) <br />Water Elevation and Total Alkalinity <br />1300 UD 6040 <br />1250 i Early Warning Indicator = 1,167 mg/L 6039 <br />1200 <br /> I I <br />1150 I 6038 <br /> <br />1100 I I <br />6037 <br />E 1050 <br />21.` 1000 6036 <br />C 950 <br />3,-o>nr its' ?'fc 6035 <br /> <br />Y <br />900 <br />{n - m - "" , m ?- <br />a 6034 <br />850 m I <br />800 ; 6033 <br />0 <br />~ 750 6032 <br />700 Temporary <br />650 m i Operational i Suspension 6031 <br />600 , T ??--1-_T T I- IL- 6030 <br />O (A 0 0 0 0 N N N N M M M M? V It LO <br />In O CD f` W O O O <br />O O 02 O O O O O O O O 00 O O O O O O O O O O O O O O O O <br />O) O ch 6) M N 44 N N N r 00 a0 r 8 CO to Ln 00 CO N n h M CO <br />O h 0 O r t` O O V i` O CO CO M 0) <br />Date <br />Water Elevation -0 Total Alkalinity Total Alkalinity Early Warning Indicator <br />The September 2010 sample from alluvial well 21-5 also showed a very slightly <br />elevated value (1 mg/L) for dissolved sodium. The September 2010 value is <br />499 mg/L in comparison to the 498 mg/L EWI level calculated from baseline <br />monitoring data for dissolved sodium. The baseline mean value for this <br />constituent at this location is 443 mg/L and the operational mean value is 468 <br />mg/L. The maximum baseline value for dissolved sodium at this location was <br />456 mg/L. The value of dissolved sodium at alluvial well 21-5 has exceeded the <br />EWI indicator six times before during the period of record for this monitoring <br />location. The points indicated above the EWI level (489 mg/L) are summarized <br />in the following table: