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• Figure 11. Surface Water Sulfate <br />1000 <br />900 <br />800 <br />700 <br />600 <br />.a <br />b, S00 <br />E <br />900 <br />300 <br />200 <br />100 <br />• <br />1000 <br />900 <br />800 <br />700 <br />600 <br />.. <br />o, 500 <br />E <br />900 <br />• <br />o f -~ I ~ I 4 <br />Dec-94 Dec-95 Dec-96 Dec-97 <br />-I-TR-A -QTR-B -~-TR-C $TR-D <br />300 <br />200 <br />100 <br />0 <br />Dec-87 Dec-R8 Dec-89 Dec-90 Dec-91 Dec-92 Dec-93 Dec-94 Dec-95 Dec-96 Dec-97 <br />fTR-A fTR-B QTR-C $TR-D <br />h <br />V~ ~ ~~ <br />17 <br />