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1 <br />1 <br />1 <br />Figure 11. Surface Waler Sulfate <br />1200 <br />1000 <br />800 <br />~ 600 <br />E <br />400 <br />200 <br />0 <br />Dec-96 <br />1200 <br />1000 <br />800 <br />.i <br />~, 600 <br />E <br />400 <br />200 <br />Dec-99 <br />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 />tTR-A -~TR-B QTR-C QTR-D <br />16 <br />Dec-97 Dec-98 <br />-QTR-A -QTR-B tTR-C QTR-D <br />