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. r <br /> introduction of more oxygen into the soil during the tank removal process may further accelerate <br /> the natural attenuation process. Total lead concentrations in the st&kpile?samples were tow, within <br /> the range of natural background Ievels. <br /> } <br /> j! <br /> i <br /> !f . <br /> ' 4 <br /> 4 <br /> F�F <br /> - i <br /> 1 <br /> 3 <br />