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Figure 29. Grouad Water Sulfate <br />3000 <br />2500 <br />2000 <br />ti <br />~, 1500 <br />E <br />1000 <br />500 <br />0 <br />Dec-95 Dec-96 Dec-97 Dec-98 <br />-QTR-1.5 --t-TR-3 tTR-9 ~-WR-1 <br /> <br />3000 <br />2500 ~ ~J//9 <br />2000 ~+ Q~ <br />~ 1500 <br />E <br />1000 <br />500 <br />0 <br />Dec-BB Dec-89 Dec-90 Dec-91 Dec-92 Dec-93 Dec-94 Dec-95 Dec-96 Dec-97 Dec-98 <br />tTR-1.5 -QTR-3 +TR-4 -0-WR-1 <br />~.J <br />39 <br />