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i <br /> f <br /> i <br /> Graph 7 - Concentrations of Hydrocarbons in Well U-3 during C-Sparge System Operation <br /> 60,000 12,000 J <br /> 0,000 <br /> 50,000 <br /> 40,000 8,000 <br /> k +, C. <br /> CL <br /> CL <br /> CL 60,000 <br /> 6,00o <br /> = C <br /> CL C <br /> C <br /> m <br /> 20,004 4,000 <br /> 10,000 2,000 <br /> Began Pilot Test <br /> .�Additional Sparge Points installed <br /> 0 0 <br /> eta �,� �'1 F0 °,Cb °,� °,� O°NO° O� o� °`l. O`L ori ory oo °` P <br /> oo�N,N,� �'o� °oo�61° o���oc,�ti° '`°o�°`'oo�ti°o�ti�o�,°°�ti°°�N'`�o�ti`'oy�`'`°.��''°o��` °�ti^,��.�ti�o►.�ti�o�?ti���`�h�`��°��0���6,,°��o°�N <br /> Sampling date <br /> �—TPHg (in ppb) 4—Benzene (in ppb} <br /> f <br />