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CONCENTRATION (ppb) <br /> 0 0 0 o a o 0 0 0 0 0 <br /> O O O O O OO O O O O <br /> O O O O O O O O O O Q O <br /> 11/22/99 <br /> 2117/00 <br /> 5/24/00 _ <br /> 8/21/00 <br /> 11/3/00 <br /> 2/27/01 <br /> y <br /> 5/16/01 <br /> x <br /> 8/7/01 °o <br /> 11/7/01 �' y <br /> a y <br /> 2/7/02 <br /> z <br /> 5/7/02 <br /> 8/7102 <br /> 11/11/02 <br /> 2/5/03 <br /> 5/23/03 <br /> 8/13103 <br /> 11/5/03 <br />