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Figure 6 - FPW <br /> pH Levels <br /> 1986 + 1987 1988 0 1989 x 1990 <br /> pH Level <br /> 12 <br /> 10 _......._._......._...................._................................................. <br /> 9 ................................_._...................................._...._......................................_......................._......._.__.._._._.__._......._._._......._._......__.............._...._...._.........._........... ....._..... <br /> _ ......................._................_.......x..................................._...._...._.........._._._._._...._...._......................_......._...._.......__.............._......................_. <br /> x o <br /> 7 <br /> 6 <br /> JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC <br /> 1986 8.8 8.4 8.8 10.2 9.1 <br /> 1987 8.9 <br /> 1988 9.6 8.3 8.3 9 <br /> 1989 8.7 7.5 8.5 8.6 <br /> 1990 7.6 8 8.4 7.9 <br />