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• <br />Fiqure 10. Surface Water Bicarbonate <br />300 <br />250 <br />200 <br />., <br />o, 150 <br />E <br />100 <br />50 <br />0 <br />Jan-94 <br /> <br />Jan-95 <br />Jan-96 <br />Jan-97 <br />-~F-TR-A -QTR-B QTR-C -}-TR-D <br />• <br />• <br />450 <br />400 <br />350 <br />300 <br />^, 250 <br />rn <br />e 200 <br />150 <br />100 <br />50 <br />0 <br />Jan-87 Jan-88 Jan-89 Jan-90 Jan-91 Jan-92 Jan-93 Jan-94 Jan-95 Jan-96 Jan-97 <br />tTR-A -~TR-B -QTR-C --~-TR-D <br />16 <br />