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<br />Figure 6 - FPW <br />pH Levels <br />1986 + 1987 ~ 1988 ° 1989 x 1990 <br />pH Level <br />12 <br />1 1 _. ..................................................................................._. <br />1 0 _ ................................... _......................................._....................._. <br />9 ~ ...................................._.........._............................_...._...._................_. <br />~ ~ ° <br />8 _..... ........................................._......x...................................._...._...._.........._........._........._......................_......._._...._...................._...................._............x....... <br />x ^ <br />7 _ .............................................._......................_....................._..........................._...._...._...._......................_.........._. <br />6 <br /> <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 />Il989 8.7 7.5 8.5 8.6 <br />fl990 7.5 8 8.4 7.9 <br />