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TPHG CONCENTRATION (ppb) <br /> N cr) co o N <br /> 0 0 0 o a o 0 <br /> 0 0 0 0 o Q o <br /> 0 0 0 0 0 0 0 0 <br /> Dec-9i <br /> Apr-92 <br /> Aug-92 <br /> Dec-92 f <br /> Apr-93 <br /> �f <br /> Aug-93 <br /> Dec-93 <br /> Apr-94 <br /> Aug-94 <br /> Dec-94 <br /> Apr-95 <br /> Aug-95 y <br /> Dec-95 �• <br /> w � <br /> v Apr-96 Cn <br /> Aug-96 <br /> m c„ ,►�+, <br /> n Dec-96 ID G� <br /> a Apr-97 `p (D o <br /> mAug-97 r <br /> Dec-97 o <br /> Apr-98 o <br /> Aug-98 <br /> Dec-98 <br /> Apr-99 <br /> Aug-99 <br /> Dec-99 f <br /> Apr-00 <br /> Aug-00 <br /> Dec-00 <br /> Apr-01 <br /> Aug-01 <br /> Dec-01 <br /> I <br /> N -' <br />