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Mid—Continent <br /> pH <br /> 9.5 <br /> 9 - <br /> 8.5 ■ <br /> 8 <br /> x <br /> a <br /> ■ <br /> 7.5 - <br /> 7 <br /> 6.5 <br /> 6 <br /> 08/28/76 05/25/79 02/18/82 11/14/84 08/11/87 05/07/90 01/31/93 10/28/95 07/24/98 <br />