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Figure E.4 <br /> N-8 Hydrocarbon Concentrations <br /> 1,000,000 1000 - <br /> General Long-Term Trend <br /> -t Benzene(ug/L) <br /> 100,000 100 Toluene(ug/L) <br /> ::7 — <br /> — Ethyl benzene(ug/L) <br /> N ---k—Total Xylenes(ug/L) <br /> Benzene,HS(ug/L) <br /> Y <br /> 10,000 10 Toluene,HIS(ug/L) <br /> L <br /> tM F Ethyl benzene HS(ug/L <br /> _ -�—Total Xylenes,HIS(ug/L) <br /> CL <br /> O Z <br /> --�-TPH-gasoline(mg/L) <br /> 1 J ITPH-diesel(mg/L) <br /> 1,000 im — TPH-gas,HIS(mg/L) <br /> V —TPH-diesel,HIS(mg/L) <br /> C y <br /> U O NAPH Thickness(feet) <br /> )( a Start of Bio Pilot Study <br /> cc <br /> UI 0.1 } <br /> m 100 <br /> v <br /> c <br /> U <br /> 2 <br /> 10 A 0.01 H Note: <br /> Only detected values shown. <br /> 1 0.001 <br /> 1990 2000 2010 2020 2030 2040 2050 <br /> Appendix_D_E_Time_Series_Charts.xls, E.4—N-8 <br />