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Figure 580. Well ~81-1 <br />pH <br />9.5 <br />9.0 <br />8.5 <br />8.0 <br />7.5 <br />~ I~~ <br />7.0 I i I i I i I~ I i I <br />Jan-81 Jan-83 Jan-85 Jan-87 Jan-89 Jan-91 Jan-93 <br />Date <br /> <br /> <br />N <br />V <br />H <br />m <br />X <br />W <br />• ~ • <br />