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<br />900 <br />800 <br />700 <br />600 <br />rn <br />~ 500 <br />W <br />H <br />Q <br />~° J 400 <br />u, ~ <br />In <br />300 <br />200 <br />100 <br />0 <br />~~ <br />'1974'1975'1976'1977'1976'1979'1960'1981'1962 '1983'1984'1985 '1986'1967'1968'1969'1990' 1991'1992'1993'1994 '1995'1996' <br />YEAR <br />FIGURE B-15. SULFATE VERSUS TIME FOR WELLS C-1, GMP-1, GP-3 AND GP-7. <br />NI <br />