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1 <br />1 <br />1 <br />Figure 34. Ground Waler Nitrite <br />1.60 <br />1.60 <br />1.40 <br />1.20 <br />,y 1.00 <br />e 0.80 <br />0.60 <br />0.90 <br />0.20 <br />0.00 <br />Dec-96 <br />Dec-99 <br />5.0 <br />4.5 <br />4.0 <br />3.5 <br />3.0 <br />.~ <br />~, 2.5 <br />E <br />2.0 <br />1.5 <br />1.0 <br />0.5 <br />0.0 <br />Dec-89 Dec-90 Dec-91 Dec-92 Dec-93 Dec-99 Dec-95 Dec-96 Dec-97 Dec-98 Dec-99 <br />tTR-1.5 -QTR-3 QTR-9 ~WR-1 <br />45 <br />Dec-97 Dec-98 <br />fTR-1.5 -QTR-3 -F TR-4 ~WR-1 <br />