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1 <br />1 <br />1 <br />1 <br />t <br />1 <br />1 <br />1 <br />Figure 15. Surface Water Unionized Ammonia <br />o.lo <br />0.09 <br />0.08 <br />0.07 <br />0.06 <br />~ 0.05 <br />E <br />0.04 <br />0.03 <br />0.02 <br />0.01 <br />0.00 <br />Dec-97 <br />0.10 <br />0.09 <br />0.08 <br />0.07 <br />0.06 <br />.a <br />rn 0.05 <br />E <br />0.04 <br />0.03 <br />0.02 <br />0.01 <br />0.00 <br />Dec-90 Dec-91 Nov-92 Dec-93 Dec-99 Dec-95 Dec-96 Dec-97 Dec-98 Dec-99 Dec-00 <br />f TR-A -QTR-B QTR-C ~-TR-D <br />Zi <br />Dec-98 Dec-99 Dec-00 <br />f TR-A -i- TR-B QTR-C QTR-D <br />