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<br />1100 <br />1000 <br />900 <br />800 <br />700 <br />Zl- <br />rn <br />600 <br />w <br />H <br />W U 500 <br />D <br />N (n <br />400 <br />300 <br />200 <br />100 <br />0 <br />YEAR <br />FIGURE B-12. SULFATE VERSUS TIME FOR WELLS GC-1, GMP-1, GP-3 AND GP-7. <br />