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UST Excavation Pit <br /> 10` <br /> ' 1 10 ppm <br /> 150 ppm <br /> f— Estimate 500 ppm TPH Contour <br /> 2o, ' 2,500 ppm <br /> 30' ' 7,100 ppm <br /> f— Estimated 100 ppm TPH Contour <br /> 40' <br /> ' BRL <br /> Figure 4. Estimated Extent of Contamination <br /> In Crass Section <br />