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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 /> 100,000 decreasing. No trend line is shown for the <br /> decreasing concentrations because 100 <br /> sufficientdata are not yet available to <br /> project a long-term trend. <br /> N <br /> N <br /> d <br /> 10,000 c <br /> 10 <br /> s <br /> F --*---Benzene (uglL) <br /> a <br /> X <br /> --S--Toluene(ug/L) <br /> X Z t Ethyl benzene(uglL) <br /> 1,000 1 —K—Total Xylenes (ug/L) <br /> rn tTPH-gasoline (mg/L) <br /> r E <br /> 0 — �TPH-diesel (mg/L) <br /> a <br /> X o NAPH Thickness (feet) <br /> W <br /> 100 Start of Bio Pilot Study <br /> 1 0. <br /> c <br /> m <br /> U — <br /> C Note: <br /> 0 Only detected values shown. <br /> 10 0.01 a- <br /> 1 0.001 <br /> 1990 2000 2010 2020 2030 2040 2050 <br /> Appendix_D_E_Time_Series_ChartsI)ds,E.6-N-16 <br />