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a <br /> Graph 7- Concentrations of Hydrocarbons in Well NP-2-60 during C-Sparge System Operation <br /> Former Unocal Service Station No. 0187 <br /> 437 East Miner Ave, Stockton, CA <br /> 25,000 0 <br /> 20,000 -5 <br /> i <br /> Additional Sparge Points Installed <br /> 15,000 -10 <br /> Began Microsparge <br /> m W <br /> a Baseline <br /> c ♦ • <br /> 10,000 -0 -15 <br /> a <br /> 5,000 -20 <br /> 0 -25 <br /> O M M M ch C.) M d a a � <br /> O O O O O Q O O O <br /> ZD N N N N N N N N N <br /> O " N nr t j uj c0 N O F ^ N r� 4 N o 4C, <br /> �N <br /> Sampling date <br /> --FTPHg (in ppb) --*—benzene (in ppb) +GWE (msl) <br />