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Figure E.5 <br /> N-15 Hydrocarbon Concentrations <br /> 1,000,000 1000 <br /> General Long-Term Trend <br /> 100,000 —�Benzene(ug/L) <br /> 100 �'' —t--Toluene(ug/L) <br /> d <br /> --t--Ethyl benzene(ug/L) <br /> y Total Xylenes(ug/L) <br /> d <br /> 10'000 —+—Benzene,HS(ug/L) <br /> 10 .2 Toluene,HS(ug/L) <br /> �- A Ethyl benzene HS(ug/L <br /> OQ Total Xylenes,HS(ug/L) <br /> Z TPH-gasoline(mg/L) <br /> 1,000 1 _j TPH-diesel(mg/L) <br /> t —e--TPH-gas,HS(mg/L) <br /> c E <br /> V W TPH-diesel,HS(mg/L) <br /> W co �—NAPH Thickness(feet) <br /> 100 Start of Bio Pilot Study <br /> m 0.1 <br /> c <br /> a� <br /> c <br /> 0 <br /> U <br /> 10 0.01 Note: <br /> Only dete�values <br /> 1 0.001 <br /> 1990 2000 2010 2020 2030 2040 2050 <br /> Append ix_D_E_Time_Series_Charts.As, E.5–N-15 <br />