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• Figure 10. Surface Water Bicarbonate <br />300 <br />250 <br />200 <br />.a <br />o, 150 <br />E <br />100 <br />50 t `~ <br />0+- <br />Dec-94 <br />~I ~ <br />Dec-95 <br />Dec-96 <br />Dec-97 <br />fTR-A -t-TR-B QTR-C $TR-D <br />C~ <br />450 <br />900 <br />350 <br />300 <br />y 250 <br />a <br />E 200 QQQ <br />150 <br />100 <br />50 <br />0 <br />Dec-87 Dec-BB Dec-09 Dec-90 Dec-91 Dec-92 Dec-93 Dec-94 Dec-95 Dec-96 Dec-97 <br />-~-TR-A -QTR-B -QTR-C $TR-D <br />• <br />16 <br />