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<br />Figure 8 - DH122 <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 />6 <br /> <br /> <br />+ + <br /> <br /> <br />x x <br /> <br /> • + <br /> o .....Q ............. ........... ......... <br /> <br /> <br /> <br /> <br />JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC <br />1986 8.1 8.3 8.1 8 8 8.3 7.5 8.I 8.4 8.3 8.2 8.1 <br />1987 8.3 8.4 8.3 <br />1988 9.2 8.1 7.4 7.8 <br />1989 7.9 7.2 7.9 8 <br />1990 7.5 7.5 7.7 7.9 <br />