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Figure 4 <br /> Former ARCO Service Station No. 2168 <br /> 441 West Charter Way, Stockton, CA <br /> TPHG and Benzene Concentration Vs. Time <br /> 60'000 1000 <br /> 900 <br /> 50 000 <br /> 800 <br /> 40 000 700 <br /> 600 <br /> 0 0 <br /> 30 000 500 ° <br /> c c <br />� V U <br />� C c <br /> O O <br /> (9 400 0 <br /> C <br /> 2Q 000 <br /> 300 m <br /> 10 000 200 <br /> 100 <br /> 0 <br /> 1124197 3115197 5/4197 4123197 8112197 1011197 11/20/97 119198 2128198 <br /> Time <br /> --4--TPHG —FBenzene <br /> h larcoVactoMble 5 Chart 2 wm 5128198 <br />