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UST Excavation <br /> 5 Area <br /> 10 / <br /> 20 I 1 I <br /> Estimated 500 mglkg TPH j <br /> Concentration Contour <br /> l l <br /> 30 ! <br /> 40 <br /> Estimated 100 mglkg TPH <br /> Concentration Contour <br /> Figure 4. Estimated Vertical Extent of Contamination <br />