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Figure 9. Surface Water Sodium <br />50 <br />45 <br />90 <br />35 <br />30 <br />.. <br />~ 25 <br />E <br />20 <br />15 <br />10 <br />5 <br />0 <br />Dec-97 <br />50 <br />45 <br />40 <br />35 <br />30 <br />rn 25 <br />E <br />20 <br />15 <br />10 <br />5 ~~ ~ 1 ~"~ ~ ~~M <br />0 <br />Dec-90 Dec-91 Nov-92 Dec-93 Dec-99 Dec-95 Dec-96 Dec-97 Dec-98 Dec-99 Dec-00 <br />-QTR-A -k-TR-B QTR-C --0-TR-D <br />~3 <br />Dec-98 Dec-99 Dec-00 <br />f TR-A -QTR-B QTR-C QTR-D <br />