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Graph 5 - Concentrations of Hydrocarbons in Piezometer NP-2-60 during <br /> C-Sparge System Operation <br /> 25,000 8,000 <br /> 7,000 <br /> Additional Sparge Poi is Installed <br /> 20,000 <br /> $,000 <br /> 15,000 5'000 a <br /> CL <br /> a <br /> 4,000 <br /> = 6aseline c <br /> 10,000 3,000 m <br /> 2,000 <br /> I` 5,000 Began Pilot Test <br /> 1,000 <br /> 0 0 <br /> rn a°j o �' o Q o 0 0 o a o a o 0 0 0 0 0 0 0 0 0 0 0 0 0 o a a o a <br /> �] O M � � � � e0 O M � M O � � � ►� e} 1 y .� � � � � M � e� 1� c� e0 eo <br /> 4 N N <br /> Sampling date <br /> +TPHg (in ppb) --*­benzene (in ppb) <br />