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• Graph 7 -Concentrations of Hydrocarbons infill! NP-2-60 during C-Sparge System Operation <br /> Former Unocal Service Station No. 0987 437 East Miner Ave. <br /> Stockton, CA <br /> 25,000 8,000 <br /> 7,000 <br /> 20,000 <br /> 6,000 <br /> Additional Sparge Points Installed <br /> 15,000 5,000 <br /> Began Microsparge a <br /> C. .r <br /> Q. <br /> on 4,000 <br /> aBaseline e <br /> F- d <br /> 10,000 Ml <br /> 3,000 <br /> 2,000 <br /> 5,000 <br /> 1,000 <br /> 0 0 <br /> I- N N N N N N M M M M M M is <br /> 0 0 0 o a o �o a o 0 0 4 0 �o a a a <br /> a �V N 0 0 M N M d �v O - N N c' 0r N N N N N CO o <br /> ao4o � .- aaM � � ai, Zaaiz ac - a � � ►. � oa � o � <br /> Sampling date <br /> -- -TPHg (in ppb) -* benzene (in ppb) <br />