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Concentration(ppb) <br /> o <br /> 1!18/89 <br /> 10/12189 -- <br /> 12/13/90 -- <br /> 3/13191 11 <br /> 6/17/91 <br /> 3/16/92 -- <br /> 0 <br /> X n <br /> m � � <br /> m 602/92 w <br /> N <br /> mRL d s <br /> o <br /> 3 a <br /> so <br /> 9117192 CD <br /> C <br /> 12/15/92 40 IE <br /> 3/12!93 <br /> 6030193 <br /> 8/31193 <br /> 12/16/93 <br /> 4129194 <br /> 7127/95 <br />