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Graph 1 - Concentrations of Hydrocarbons in Piezometer NP-1-22 during <br /> C-Sparge System Operation <br /> 30,000 1,400 <br /> i <br /> 25,000 1,200 <br /> 1,000 � <br /> 20,000 �,Basellne <br /> a 800 a <br /> 15,000 <br /> Additional Sparge Points Installed 600 <br /> m <br /> 10,000 I <br />� 400 <br /> 5,000 200 <br /> L <br /> fl 0 <br /> g�' o°' oZc� c�' o° o oo o'' o oo opo oo o I-V 1-'V I-ryO`1O`10-0' o`' o'� o`' �'� c� <br /> +�04iryry O� ry �� ►:O �: ►M �� ryhry �o �4`� � !\v hry �`� p O`ry *`ry +ev `, p rye O ry <br /> Sampling date <br /> —�—TPHg (in ppb) benzene (in ppb) <br />