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pH (Lab) <br />9.0 <br />8.5 <br />S 8.0 <br />U <br />7.5 <br />7.0 <br />08/84 08/86 <br />O A-6 <br />08/88 08/90 <br />08/92 08/94 08/96 08/90 <br />Date <br />