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0 <br /> Benzene and TPH-g Vapor Phase Concentrations Versus Time <br /> Quik Stop#121 <br /> Manteca, CA, September 18, 2001 <br /> 120 16,000 <br /> 100 - 14,000 <br /> -� 12,000 <br /> J <br /> 80 <br /> o - 10,000 <br /> a n <br /> 0 60 -- 8,000 <br /> 0 py <br /> U <br /> m 0 <br /> N 40 6,000 <br /> � r <br /> m •. <br /> -- 4,000 <br /> 20 <br /> - 2,000 <br /> 0 0 <br /> 0630 hrs 930 hrs 1300 hrs <br /> Operating Time (Hours) <br /> +Benzene --a— <br /> Chart 2 <br />