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1 <br />1 <br />1 <br />1 <br />Figure 9. Surface Water Sodium <br />50 <br />45 <br />40 <br />35 <br />30 <br />~ 25 <br />E <br />20 <br />15 <br />10 <br />5 <br />0 <br />Dec-96 <br />Dec-99 <br />50 <br />45 <br />40 <br />35 <br />30 <br />.a <br />b, 2 5 <br />E <br />20 <br />15 <br />10 <br />5 <br />0 <br />Dec-69 Dec-90 Dec-91 Dec-92 Dec-93 Dec-94 Dec-95 Dec-96 Dec-97 Dec-98 Dec-99 <br />f-TR-A -QTR-B QTR-C QTR-D <br />13 <br />Dec-97 Dec-98 <br />-f-TR-A -QTR-B QTR-C QTR-D <br />