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r r r r r +r r r �• r• �• r' �■s r �r r� r� r r <br /> Figure E.6 <br /> N-16 Hydrocarbon Concentrations <br /> 1,000,000 1000 <br /> General Long-Term Trend <br /> The concentrations temporarily increased <br /> after pump shutdown for the start of the <br /> biological pilot study and are now steadily <br /> decreasing. t Benzene(ug/L) <br /> 100,000 100 – Toluene(ug/L) <br /> Ethyl benzene(ug/L) <br /> Total Xylenes(ug/L) <br /> N Benzene,HS(ug/L) <br /> C <br /> 10 U – Toluene,HS(ug/L) <br /> 10,000 <br /> ti Ethyl benzene HS(ug/L <br /> CIL — <br /> ~Total Xylenes,HS(ug/L) <br /> O Z tTPH-gasoline(mg/L) <br /> x —TPH-diesel(mg/L) <br /> ��. 1,000 1 J <br /> p) —TPH-gas,HS(mg/L) <br /> V —TPH-diesel,HS(mg/L) <br /> C N <br /> U CO NAPH Thickness(feet) <br /> a Start of Bio Pilot Study <br /> Lu <br /> 100 0.1 <br /> U <br /> C <br /> O <br /> U <br /> CL <br /> 2 <br /> 10 0.01 Note: <br /> Only detected values shown. <br /> 1 0.001 <br /> 1990 2000 2010 2020 2030 2040 2050 <br /> Appendix–D–ETime_Sedes_Charts.xls,E.6–N-16 <br />