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• <br />600 <br />500 <br />400 <br />rn <br />LLI <br />Q 300 <br />~ ~ <br />J <br />J /_^ <br />V/ <br />200 <br />100 <br />0 1974 197' S' 1976'1977 <br />FIGURE B-11. <br />1978' 1979'1980'1981'1982'1983'1984'1985'1986'1987'1988'1989'1990' 1991'1992'1993'1994'1995'1996' <br />YEAR <br />>Po 1L <br />SULFATE VERSUS TIME FOR WELLS GA-1, GD-2, GD-3 AND GE-1. <br />Q ~ <br />