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Figure E.7 <br /> N-17 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 /> 100,000 decreasing. 100 +Benzene(ug/L) <br /> �-Toluene(ug/L) <br /> w —}—Ethyl benzene(ug/L) <br /> N Total Xylenes(ug/L) <br /> N <br /> Benzene,HS(ug/L) <br /> 10,000 10 r Toluene,HS(ug/L) <br /> F- —�Ethyl benzene HS(ug/L <br /> N 0- —}—Total Xylenes,HS(ug/L) <br /> c ; I <br /> O Z —�—TPH-gasoline(mg/L) <br /> M16. i —+—TPH-diesel(mg/L) <br /> 1,000 1 — TPH-gas,HS(mg/L) <br /> c <br /> _ TPH-diesel,HS(mg/L) <br /> O y <br /> --o—NAPH Thickness(feet) <br /> X I O <br /> LV I I r Start of Bio Pilot Study <br /> m 100 0.1 w <br /> c <br /> d <br /> O <br /> U <br /> 2 <br /> 10 i 0.01 0- <br /> I !Note: <br /> Only detec=values <br /> 1 0.001 <br /> 1990 2000 2010 2020 2030 2040 2050 <br /> AX1001182027SCO <br />