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• <br />2500 <br />2000 <br />c 1500 <br />E <br />w <br />H <br />U <br />w 1000 <br />500 <br />0 <br />0 0 <br />YEAR <br />FIGURE B-13. SULFATE VERSUS TIME FOR WELLS GC-2, GP-9, P-S AND P-8. <br />