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FIGURE 4 <br /> ARCO Service Station 2168 <br /> 441 West Charter Way, Stockton, California <br /> 60000 TPHG Concentration Vs Time <br /> 50000 <br /> I <br /> 40000 <br /> M <br /> 5 <br /> 'as <br /> E <br /> C <br /> 2 <br /> r <br /> 30000 <br /> O <br /> CL <br /> 20000 <br /> 10000 <br /> 0 <br /> 1120197 3111197 4130197 6119197 818197 9127197 <br /> Time <br /> {Sampling Dates) <br />