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Figure 4 <br /> TPHG Concentrations Vs. Time <br /> ARCO Service Station No. 2130 <br /> 5000 - <br /> 45M -- <br /> 4000 -- <br /> 3500 -- <br /> E <br /> 000 <br /> .. 3500 <br /> M <br /> E <br /> m <br /> E 3000 <br /> c <br /> O <br /> 2500 -- <br /> C <br /> m <br /> v <br /> Q� <br /> V <br /> 2000 -- <br /> G <br /> F- 1500 <br /> -- <br /> 1000 -- <br /> 600 -- <br /> 0 - <br /> Apr-95 <br /> 0005000Apr-95 Jul-95 Oct-95 Feb-96 May-96 Aug-96 Dec-96 Mar-97 Jun-97 Sep-97 Jan-98 <br /> Time <br />