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1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />i <br />1 <br />t <br />1 <br />Figure 3. Surface Wa[er pH <br />12.0 <br />9.0 <br />N <br />M <br />C <br />~ 6.0 <br />m <br />v <br />C <br />m <br />L <br />3.0 <br />0.0 ~ <br />Dec-96 <br />12.0 <br />9.0 <br />N <br />L <br />'° 6.0 <br />m <br />v <br />c <br />ro <br />3.0 <br />Dec-97 Dec-98 Dec-99 <br />f TR-A ~-TR-B QTR-C ~-TR-D <br />0.0 <br />Dec-89 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 />6 <br />