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I <br /> Graph 4 - Concentrations of Hydrocarbons in Well NP-2-22 during C-Sparge System Operation <br /> 1800 70 <br /> 1600 <br /> 60 <br /> 1400 <br /> 5D <br /> 1200 -- <br /> 40 <br /> 1000 - -- - -- --- - <br /> Ca <br /> L <br /> a1 <br /> N <br /> CL <br /> 800 --- — - - - -- - — - 30 m <br /> 600 <br /> zD <br /> Additional Sparge Points Installed <br /> 400 -— —- - ML - <br /> Baselin <br /> 10 <br /> 200 —- <br /> Began ' <br /> Pilot <br /> Test <br /> 0 0 <br /> Sampling date , <br /> - --TPI-Ig (in ppb) -*--benzene (in ppb) <br /> 4 <br />