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1 <br />1 <br />1 <br />Figure 16. Surface Water Nitrite <br />0.35 <br />0.30 <br />0.25 <br />0.20 <br />E 0.15 <br />0.10 <br />0.05 <br />0.00 <br />Dec-96 <br />0.35 <br />0.30 <br />0.25 <br />~ 0.20 <br />rn <br />~ 0.15 <br />0.10 <br />0.05 <br />Dec-99 <br />0.00 <br />Dec-89 Dec-90 Dec-91 Dec-92 Dec-93 Dec-99 Dec-95 Dec-96 Dec-97 Dec-98 Dec-99 <br />-QTR-A -k-TR-B tTR-C ~-TR-D <br />22 <br />Dec-97 Dec-98 <br />fTR-A -~TR-B -F TR-C QTR-D <br />