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i <br /> Fre 4 <br /> ARCO Service Station No 2130 <br /> 7906 No El Dorado Street, Stockton, CA <br /> TPHG Concentration Vs Time <br /> 5000 <br /> 4500 -- <br /> 4000 <br /> 3500 <br /> M <br /> E 3000 <br /> cs <br /> E <br /> c <br /> e <br /> 4— <br /> @ 2500 <br /> c <br /> m <br /> C <br /> O <br /> U <br /> y 2000 <br /> CL <br /> r <br /> 1500 <br /> 1000 <br /> 500 <br /> 0 <br /> Apr 95 Jul-95 Oct 95 Feat 96 May 96 Aug 96 Dec 96 Mar-97 <br /> Time (sampling events) <br />