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Figure 10 - AMW-1 <br /> pH Levels <br /> 1988 ❑ 1989 x 1990 <br /> pH Level <br /> 12 <br /> 10 ....... <br /> 9 ..............................................._..............._.........._.........._.........._...._._............._...._....__......_......_._._._...._._..._....._......................_.........._._......._.......__ ....._..... <br /> 8 ................x._..............................._...._.........._... ...................._............................_.................................._._.......__..__._...._................_........._........................................_............................_.........._.... <br /> x ❑ x <br /> 6 <br /> JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC <br /> 1988 8.1 8.6 9.1 <br /> 1989 8.3 7.9 7.5 7.6 <br /> 1990 8 7.7 7.6 7.6 <br />