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FIGURE 16-AMW-1 <br /> pH LEVELS <br /> 12 <br /> 11 <br /> 10 <br /> J <br /> W <br /> 9 <br /> a <br /> 8 <br /> 7 <br /> 6 <br /> JAN FEB MAR APR MAY JUN JUL AUG SEPT OCT NOV DEC <br /> MONTH <br /> 0 1988 <br />