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Figure 8 - DH122 <br /> pH Levels <br /> 1986 + 1987 1988 0 1989 x 1990 <br /> pH Level <br /> 12 <br /> 10 _._...._...._......._......- ...._.........._...._._._......................_................_. <br /> 9 ..........................................................................__...................._....._................................................._...._.........._....__...._....._._........._............._......._.........._...................... <br /> .............. .........• ...........................�........................_.................................._....................................._................ o............_........._ ........... <br /> x x <br /> 7 <br /> 6 <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 8.1 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 7.6 7.7 7.9 <br />