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tr r� rr rr w r■� ■■r rs �r rr r r rs r �r rr rr r� r� <br /> Figure 4. Sodium and Sulfate Concentrations <br /> Sodium versus Sulfate <br /> • Most groundwater <br /> monitoring locations <br /> 300 A <br /> have no relation <br /> between sodium and 250 A <br /> sulfate concentrations <br /> 200 <br /> • MW-7 samples exhibit t <br /> strong inverse relation E 150 ♦i Ae <br /> between sodium and o �• ••t <br /> sulfate concentrations 100 <br /> 50 <br /> 0 <br /> 0 500 1000 1500 2000 2500 3000 <br /> Sulfate (mg/L) <br /> •MW-10 •MW-11 MW-12 MW-13 •MW-5 <br /> 0 MW-6 0 MW-9 0 MW-8 ♦MW-7 <br />