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Concentration(ppb) <br /> 0 <br /> a 0 0 0 0 <br /> 10/01/87 - <br /> 02/02/88 <br /> 06/24/88 <br /> 01118/89 - <br /> 10/12/89 <br /> 03/13/91 <br /> 03/16/92 - <br /> 06/02/92 - <br /> 12/15/92 - <br /> 03/12/93 - <br /> 06130/93 <br /> 3/16/9206/02/9212/15/9203/12/9306/30/93 <br /> 08/31/93 <br /> 12/16/93 <br /> 04/29/94 <br /> 09/27/94 <br /> 07/27/95 0 <br /> 11/16/95 <br /> O CCD <br /> 02/07/96 z <br /> m <br /> 05/21/96 N =11, <br /> = O <br /> m 08/28/96 m C <br /> m p 12/30/96 N <br /> "' cp m <br /> 02/21/97 <br /> 05/09/97 w <br /> v <br /> -i 08/14/97 <br /> z <br /> G) 11/06/97 <br /> 02/13/98 <br /> 05/19/98 <br /> 08/06/98 <br /> 11/05/98 <br /> 02/24/99 <br /> 05/11/99 <br /> 08/10/99 <br /> 11/08/99 - <br /> 02/08/00 - <br /> 05/02/00 - <br /> 08/10/00 - <br /> 11/14/00 - <br /> 02/09/01 <br /> 1/08/9902/08/0005/02/0008/10/0D11/14/0002/09/01 <br /> 05/22/01 <br /> 08/06/01 <br /> 11/09/01 <br /> 02/08/02 <br /> � u <br />