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Concentration(ppb) <br /> o <br /> 1011/87 <br /> 2!2188 <br /> 6124/88 <br /> 1/18/89 -- <br /> 10112/89 -- <br /> 12/13/90 -- <br /> 3/13/91/18/8910/12/8912/13/903113/91 <br /> 6/17/91 <br /> 3/16/92 -- <br /> 0 <br /> 612192 <br /> OCD <br /> 9117192 <br /> m fA .w► <br /> m = O <br /> m 12/15/92 O <br /> t <br /> Z y <br /> 3/12193 3 <br /> O <br /> z <br /> 6/30/93 -- <br /> 8/31/93 -- <br /> 12/16/93 -- <br /> 4/29/94-- <br /> 9/27/94 <br /> /30/938/31/9312/16/934/29/949/27194 <br /> 7/27/95 -- <br /> 11/16/95 -- <br /> /2719511/16/95 <br /> 12130/96-- <br /> 8/13/97 -- <br /> 816198 <br /> 8110199 , <br />