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D - 1 A MONITORING WELL <br /> CONDUCTIVITY <br /> 6 <br /> 5 <br /> 4 pj <br /> N N 3 <br /> O > ' <br /> � O /� v <br /> 2 <br /> 1 <br /> 6/80 3/81 12/81 12/82 12/83 12/84 12/85 12/86 12/87 12/88 9/89 <br /> DATE BY CALENDER QUARTER <br />