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TPHG CONCENTRATION (ppb) <br /> l j <br /> Dec,91 <br /> Jun-92 <br /> Sep-92 <br /> Aug-93 <br /> Dec-93 <br /> Mar-94 <br /> y <br /> Jun-94 N <br /> w <br /> C C <br /> n Aug-94 <br /> m <br /> Dec-94 <br /> d <br /> my Mar-95 ia <br /> n � <br /> Jun-95 c <br /> Jun-96 <br /> Oct-96 <br /> Jul-97 <br /> Oct-97 <br /> Sep-98 <br /> Sep-99 <br /> .l <br />