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TPHG CONCENTRATION (ppb) <br /> N A O] co O N00 A <br /> Co O O O O O O <br /> O O O C=� O O O O <br /> Dec-91 E <br /> I <br /> Jun-92 - <br /> Dec-92 <br /> Jun-93 <br /> Dec-93 <br /> Jun-94 <br /> Dec-94 <br /> Jun-95 <br /> Dec-95 <br /> Jun-96 <br /> Dec-96 <br /> w � <br /> Jun-97 0 <br /> m Dec-97 b oil <br /> n Jun-98 <br /> CD <br /> � Dec-98 Ln <br /> v Jun-99 <br /> Dec-99 <br /> n � <br /> Jun-00 a <br /> Dec-00 <br /> Jun-01 <br /> Dec-01 <br /> Jun-02 ` <br /> Dec-02 <br /> Jun-03 <br /> Dec-03 <br /> Jun-04 <br /> Dec-04 <br /> I � � <br /> n� <br /> I <br />