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Graph 3 -Concentrations of Hydrocarbons All NP-1-22 during C-Sparge System Operation <br /> Former Unocal Service Station No. 0187 437 East Miner Ave. <br /> Stockton, CA <br /> 1,400 <br /> 30,000 <br /> 1,200 <br /> 25,000 <br /> 1,000 <br /> Baseline <br /> 20,000 <br /> 800 a <br /> .CL <br /> CL c <br /> CL 15,000 N <br /> = 600 <br /> CL m <br /> r <br /> Additional Sparge Points Installed <br /> 10,000 400 <br /> 5,000 200 <br /> Began Microsparge <br /> 0 <br /> 0 <br /> pie <br /> °�\ ^\ °\o^� � ^\ °^��o°�,��°������ oo0 °�ti o°� "b\0���° °��� o��ti oh�ry o��ti �o� oo� <br /> o N o 0 <br /> Sampling date <br /> --n—TPHg (inppb) -+—benzene (in ppb) <br />