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• Figure 11. Surface Water Sulfate <br />1200 <br />1000 <br />800 <br />~ 600 <br />E <br />400 <br />200 <br />0 <br />Dec-95 <br />• <br />1200 <br />1000 <br />800 <br />~ 600 <br />E <br />400 <br />200 <br />Dec-98 <br />0 <br />Dec-88 Dec-89 Dec-90 Dec-91 Dec-92 Dec-93 Dec-94 Dec-96 Dec-96 Dec-97 Dec-98 <br />fTR-A -~TR-B -QTR-C QTR-D <br />• <br />17 <br />Dec-96 Dec-97 <br />~-TR-A ~TR-B -~-TR-C -QTR-D <br />