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• <br />1000 <br />900 <br />BOO <br />• 700 <br />N <br />O <br />= 600 <br />7 <br />SOD <br />400 <br />ci <br />C <br />n 300 <br />u <br />e <br />MIDDLE CREEK ABOVE MINE 3, USGS STATION 09234700 (700) <br />MEAN QUARTERLY CONDUCTIVITY, FIELD <br />1980 19 81 1982 19 8 3 1984 198 5 1986 19 87 1988 1989 19 9 0 <br /> <br />