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Figure 11. Surface Water Sulfate <br />1200 <br />loon <br />800 <br />.ti <br />~ 600 <br />E <br />400 <br />200 <br />0 <br />Dec-97 <br />1200 <br />1000 <br />800 <br />r, <br />~ 600 <br />E <br />900 <br />200 <br /> <br /> <br />Dec-98 Dec-99 <br />f TR-A -QTR-B tTR-C QTR-D <br />Dec-00 <br />0 <br />Dec-90 Dec-91 Nov-92 Dec-93 Dec-94 Dec-95 Dec-96 Dec-97 Dec-98 Dec-99 Dec-00 <br />f TR-A -QTR-B -QTR-C QTR-D <br />16 <br />