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Concentration(ppb) <br /> 1011187 <br /> 212!88 <br /> 6/24/88 <br /> 1/18/89 -- <br /> 10/12189 -- <br /> 12113/90 - <br /> 3/13/91 <br /> 118/8910/12/8912/13/903113191 <br /> 6117191 <br /> 3/16192 <br /> t'! <br /> 612192 a n <br /> 1 = <br /> 9117/92 w <br /> 2 <br /> �N 12/15/92 <br /> • <br /> z v <br /> 3/12193 40 -3 <br /> 6/30/93 -- <br /> 8131/93 <br /> 130/93 8131193 <br /> 12/16/93 <br /> 4/29/94 -- <br /> 9/27/94 -- <br /> 7/27/95 -- <br /> 1291949/271947/27/95 <br /> 11/16/95 <br /> 12/30/96 <br /> 8113/97 <br /> 816/98 <br /> 8110199 <br />