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1 <br />1 <br />1 <br />1 <br />Figure 6. <br />'.,.~rface Water: Unionized NH4 /Nitrite / Ortho Phosphate <br />Unionized NH4 <br />0.05 <br />0.045 <br />0.04 <br />0.035 <br />0.03 <br />0.025 <br />0.02 <br />0 075 <br />0.01 <br />0.005 <br />0 <br />Dec-87 <br />Dec-88 Dec-89 Da-90 Dec-91 Dcc-92 <br />Nitrite <br />a.o7 <br />0 06 <br />0.05 <br />_ O.Oa <br />0.03 <br />0.02 <br />0.01 <br />0 <br />Dec-87 <br />Ortho Phosphate <br />o.t4 <br />0.1 z <br />o.l <br />0 os <br />o.ob <br />o.oa <br />0.02 <br />0 <br />Dec-87 <br />-•- IR-A G TR-B -•- iR-C -~- 1R-D <br />13 <br />Dcc-88 Dec-89 Dec-90 Dec-91 Dec-92 <br />Dcc-BS Dec-89 Dec-90 Dcc91 Dec-92 <br />