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Figure 4 <br /> TPHG Concentrations Vs Time <br /> ARCO Service Station No 2130 <br /> 7906 North El Dorado Street, Stockton, California <br /> 5000 <br /> 4500 <br /> M 4000 <br /> E <br /> E <br /> 3500 <br /> I <br /> 3000 <br /> 2 <br /> m <br /> 2500 <br /> i C <br /> m <br /> c 2000 <br /> O <br /> U <br /> 1500 <br /> 2 <br /> CL 1000 - <br /> 500 -- air sparge start date <br /> 0 <br /> Apr 95 Jul-95 Oct 95 Feb-96 May 96 Aug-96 Dec-96 Mar 97 Jun-97 Sep-97 <br /> Time <br />