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1 <br /> UST Excavation <br />' 5 Area <br /> 10 <br /> 20 t 1 ! <br /> 1 Estimated 500 mglkg TPH j <br /> Concentration Contour <br /> 1 I I f <br /> 30 <br /> 1 <br /> 40 <br />' Estimated 100 mglkg TPH <br /> Concentration Contour <br /> 1 <br /> wLCrk%-I <br /> 8r Figure 4. Estimated Vertical Extent of Contamination <br />