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i:~ <br />' Figure 4. <br />Surface Water: Sulfate / Bicarbonate <br /> <br />Sulfate <br /> J <br /> <br /> ~ .... <br />i <br />Dcc 30 Dec~81 Dec~82 Dec-83 Dec-84 Dec-85 Dec-86 Dec-87 Dec-88 Dec-89 Dec-90 Dec-91 Dec-92 <br />4JV <br />aoo <br />350 <br />300 <br />_ 250 <br />200 <br />150 <br />100 <br />50 <br />0 <br />Bicarbonate <br /> ' <br /> ~ ! <br /> . , <br /> _ ~ <br />. <br /> <br /> <br /> <br />Dec-BO Dcc-81 Dec-82 Dec-83 Dec-84 Dcc-85 Dec-86 Dec-87 Dec-88 Dec-89 Dec-90 Dec-91 Dcc-92 <br />4JV <br />400 <br />350 <br />300 <br />250 <br />200 <br />150 <br />100 <br />50 <br />0 <br />Ratio <br />Sufate Bicarbonate <br /> S04 = HC03 for y 1.0 (--•); S04 >HCO3 for y > 1.0; SO4 < HCOI for y c 1.0 <br />,4.0 t] <br />7.0 <br />ti.0 <br />5.0 <br />a.o <br />3.o O o O O O <br />2.o g O B. ~ o 0 0 <br />1.0 _-0 _ _ -~ _ ~- ~' $a ~ _a ~ _ <br />Q ft' <br /> • • B • .d r • i ~ o <br />0.0 •_i . a te. ._. ^ ... i. ... • . ._• <br />Dec -€0 Dec-81 Dec-82 Dcc-83 Dec-84 Dec-85 Dcc-86 Dec-87 Du-BB Dcc-89 Dec-90 Dec-91 Dec-92 <br /> •~ 1R-A ~ 7R-B 7R-C O 7R-D <br />9 <br />