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Figure 3. Surface Water pH <br />12.( <br />9 <br />N <br />L <br />.'J <br />'6 6 . <br />m <br />v <br />c <br />m <br />L <br />N <br />3 <br />0.0 ~ <br />Dec-97 <br />12.0 <br />9.0 <br />N <br />L <br />b 6.0 <br />m <br />ro <br />C <br />b <br />L <br />U! <br />~I ~ <br />!°I ~I''I a <br />3.0 <br />0. 0~ I I i I I I F I I-~ <br />Dec-90 Dec-91 Nov-92 Dec-93 Dec-94 Dec-95 Dec-96 Dec-97 Dec-98 Dec-99 Dec-00 <br />fTR-A --QTR-B QTR-C -QTR-D <br />6 <br />Dec-98 Dec-99 Dec-00 <br />~-TR-A -QTR-B QTR-C ~-TR-D <br />