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Concentration(ppb) <br /> 1128/90 <br /> 1/28/91 <br /> 3113/91 <br /> 6117/91 <br /> 3/16/92 <br /> 612/92 - <br /> 9/17/92 -- <br /> 12J1 5/92 <br /> 121929/17/9212/15/92 <br /> 3/12/93 <br /> 6130/93 <br /> 8131193 <br /> 12/16/93 <br /> 4/29/94 -- <br /> 0 <br /> 9/27194 ACD <br /> n <br /> 7127/95 O = <br /> z 11/16/95 <br /> O <br /> mG 217196 A=i • <br /> tD 5/21196 <br /> 8/28/96 - <br /> 12/30196 <br /> 128/96 12/30/96 <br /> eo <br /> 2121197 <br /> 5/9/97 <br /> 8113/97 <br /> 11/6/97 <br /> 2113/98 <br /> 5119/98 <br /> 816198 -- <br /> 11/5/98 -- <br /> 2124/99 -- <br /> 161981115/982124/99 <br /> 5/11/99 -- <br /> 8/10/99 -- <br /> 11/8/99 -- <br /> 2/B/00 <br /> 111/998110/991118/992/B/00 <br /> 512100 • <br />