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Figure 4 <br /> TPHG Concentration Vs. Time <br /> ARCO Service Station No 2168 <br /> 441 West Charter Way, Stockton, California <br /> 60,000 — <br /> 60,000 <br /> 40 000 <br /> I M <br /> E <br /> ar <br /> E <br /> C <br /> 0 <br /> m 30,000 <br /> c <br /> m <br /> u <br /> c <br /> 0 <br /> V <br /> C7 <br /> 2 <br /> a <br /> H <br /> 20,000 <br /> 10,000 <br /> 1120197 1/30197 2/9197 2119197 3!1197 3111197 3121197 3131197 4/10197 4120197 <br /> Time <br />