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HUMIDITY CELL TESTS <br />pH of sample leachates <br />9.08 <br />8.00 <br />7.08 <br />6.00 <br />N <br />J <br />C 5.00 <br />7 <br />S <br />Q <br />= 4.00 <br />4 <br />3.00 <br />2.00 <br />1.00 <br />0.80 <br />10 12 14 16 18 20 <br />^ E-637 60-100 <br />E-668 65-SBB <br />TIME (weeks) <br />