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<br />Figure 7 - DH96 <br />pH Levels <br />1986 + 1987 ~ 1988 ° 1989 x 1990 <br />pH Level <br />12 <br />11 <br />10 <br />9 <br />8 <br />7 <br /> <br /> ~ <br />-~- <br /> <br /> <br />o <br /> x <br />x <br /> <br />.........................................................o..................... <br /> <br />6 <br />JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC <br />1986 8.2 8.2 8.5 8.3 8.2 <br />1987 8.3 8.4 9.5 8.3 <br />1988 9.6 8.05 7.3 8.2 <br />1989 7.7 7.8 7.8 8 <br />1990 7.4 7.5 7.9 8.3 <br />