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In page Rocky Flats Plant:

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Dr. John Candler Cobb, Professor of Preventive Medicine at the University of Colorado Medical Center, led a study for the EPA which found that residents near Rocky Flats had higher concentrations of plutonium in their lungs than those further away. This study was funded after a previous study on cattle showed similar results.[32] He later testified that the most significant danger of radioactive contamination came from the 1967 incident in which oil barrels containing plutonium leaked 5,000 US gallons (19,000 L) of oil into sand under the barrels, which was then blown by strong winds as far away as Denver.[citation needed]