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Figure 9 - SMW-2 <br /> pH Levels <br /> 1986 + 1987 1988 0 1989 x 1990 <br /> pH Level <br /> 12 <br /> 10 <br /> t <br /> 8 +............... ....................... ................................. ..........................+......................................_....................................._...._.........._...._......................_...................................................._. <br /> . o ❑......._...._........._x <br /> 7 ............. ................................_...x ❑ ........................._...._...................... ................. <br /> b <br /> JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC <br /> 1986 6.8 7.4 8.2 7.8 7.8 7.8 7.7 7.6 7.8 6.6 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 />