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Concentration(ppb) <br /> CD <br /> 10/1/87 - <br /> 212/88 -- <br /> 6/24188 -- <br /> 1/18/89 -- <br /> 10112189 -- <br /> 12/13190 -- <br /> 3113/91 <br /> 0/1187212/8861241881/1818910/12/8612/13/903113191 <br /> 6/17191 <br /> 3/16192 -- <br /> 0 <br /> 6/2/92 -- <br /> 0 m <br /> 9117/92 H rt <br /> 00 - <br /> m _ <br /> m 12115/92 w <br /> z o 3 H <br /> 3112193 "�+ <br /> d � <br /> 6130193 <br /> � ns <br /> 8131/93 <br /> 12/16/93 <br /> 4129194-- <br /> 9/27/94-- <br /> 7/27M <br /> 129/949/27/947127/95 <br /> 11/16/95 - <br /> 12J30/96 <br /> 8113197 <br /> 8/6198 <br /> 8110/99 <br /> !� i <br />