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Concentration(ppb) r� <br /> 10/l/87 - <br /> 2(2/88 -- <br /> 6/24/88 -- <br /> 1/18/89 -- <br /> 10112/89 -- <br /> 12113190 -- <br /> 3/13/91 <br /> 011187212/866/24/88111818910/12/8912/13/903/13/91 <br /> 6/17191 <br /> 3/16/92 <br /> 612/92 <br /> a � <br /> 1 9/17/92 <br /> 5I� ra <br /> eo <br /> z12/15/92 = p <br /> m <br /> i m � C <br /> m 3/12193 3 to <br /> rn � m � <br /> 6130/93 -- <br /> 8131/93 N <br /> 12/16/93 <br /> i <br /> 4/29/94 - <br /> 9/27194 - <br /> 7/27195 <br /> /29/949/271947/27195 <br /> 11116/95 - <br /> 12/30196 - <br /> 8/13/97 -- <br /> 1/16/9512/30/968/13/97 <br /> 816198 <br /> 8/10/99 <br /> 8110/00 46 PEi <br />