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• Fiqure 16. Surface Water Nitrite <br />0.07 <br />0.06 <br />0.05 <br />0.04 <br />ti <br />rn <br />E 0.03 <br />0.02 <br />0.01 <br />0.00 <br />Jan-94 <br />u <br />0.07 <br />0.06 <br />0.05 <br />0.04 <br />H <br />E 0.03 <br />0.02 <br />0.01 <br />Jan-97 <br />0.00 <br />Jan-87 Jan-88 Jan-89 Jan-90 Jan-91 Jan-92 Jan-93 Jan-94 Jan-95 Jan-96 Jan-97 <br />f•TR-A -QTR-B tTR-C QTR-D <br />• <br />23 <br />Jan-95 Jan-96 <br />-f-TR-A ~-TA-B -f-TR-C --QTR-D <br />