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Graph 6 - Concentrations of Hydrocarbons in Well NP-2-22 during C-Sparge System Operation <br /> Former Unocal Service Station No. 0187 437 East Miner Ave. <br /> Stockton, CA <br /> 1,800 70 <br /> 1,600 <br /> 60 <br /> 1,400 <br /> 50 <br /> 1,200 <br /> a 1,000 40 <br /> CL <br /> n ~L <br /> W <br /> as � <br /> = N <br /> I a 800 Began 30 <br /> Miorasparge <br /> IM <br /> 600 <br /> Additional Sparge Points Installed 20 <br /> 400 <br /> Baseli a 10 <br /> zaa <br /> 0 0 <br /> �o�\oo \oo � goo ►. ma N ►. N N ����o& 1\��\& ��& �\oo �\��oo <br /> 0 0 o <br /> Sampling date <br /> -f-TPHg (in ppb) -0 benzene (in ppb) <br /> • • i <br />