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<br />Figure 9 - SMW-2 <br />pH Levels <br />1986 + 1987 ~ 1988 ° 1989 <br />x 1990 <br /> <br />pH Level <br />12 <br />11 <br />10 <br />9 <br />8 <br />7 <br />6 <br /> JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC <br />19 8 6 6.8 7.4 8.2 7.8 7.8 7.8 7.7 7.5 7.8 6.5 8.1 <br />1987 8.2 8.3 8.1 8.8 9.2 9.1 8.7 <br />1988 9.4 8.8 8.7 8.2 7.6 8.4 7.8 <br />1989 7.6 6.8 7.2 7 <br />1990 7 7 7 7.3 <br />