ROCKY FLATS SOIL CONTAMINATION HISTORICAL SEQUENCE JULY 1958 DRUM STORAGE AREA ESTABLISHED, DRuMS CONTAINING PLUTONIUM CONTAMINATED OILS WERE ADDED DuRING SUBSEQUENT YEARS 1959 First DRUM LEAKAGE DISCOVERED AND RUST INHIBITOR, ETHANOLAMINE, Was ADDED To Drums PRIOR TO STORAGE To MINIMIZE CORROSION JANUARY 1964 First EVIDENCE OF LAYER SCALE DETERIORATION OF Drums WAS REPORTED. SOIL CONTAMINATION Was REPORTED To RE INCREASING.