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UST Excavation <br /> Area <br /> 10 / \ <br /> 000, <br /> 20 1 r ! <br /> Estimated 500 mg/kg TPH j <br /> Concentration Contour <br /> � l <br /> � � 1 <br /> 30 I [ <br /> 40 <br /> Estimated 100 mg/kg TPH <br /> Concentration Contour <br /> � �,, �� Figure 4. Estimated Vertical Extent of Contamination <br />