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Figure 7 - DH96 <br /> pH Levels <br /> 1986 + 1987 1988 0 1989 x 1990 <br /> pH Level <br /> 12 <br /> 1 1 _.......... <br /> 10 <br /> 9 <br /> 8Q..................._t........................................................ ........................................................_........_...._.........._................_...._........ .......................................... <br /> ......................._ .......................... <br /> ❑ ❑ <br /> x x <br /> 7 _.....__...._...._........................................_..._..............._.........._................. <br /> 6 <br /> JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC <br /> 1986 8.2 8.2 8.6 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 />