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TUNNEL REFUSE STrA-\TION 1 1 <br /> 320 <br /> 300 <br /> 280 <br /> 260 <br /> 240 <br /> 220 ' <br /> 200 <br /> 180 <br /> 160 <br /> 140 <br /> 120 <br /> 100 <br /> 80 <br /> 60 <br /> 40 <br /> 20 <br /> 0 <br /> 1 /26/844/10/84 7/5/84 10/9/84 1 /9/85 4/10/85 7/7/85 10/3/85 1 /7/86 <br /> Date <br /> o TDS + Sulfate o Iron. a Depth <br />