Who constructed and operated Basin F at the Rocky Mountain Arsenal through late 20th century?
Basin F: Basin F was constructed by the United States Army in 1956 at the Rocky Mountain Arsenal, to provide for the disposal of contaminated liquid wastes from the chemical manufacturing operations of the Army and its lessee Shell Chemical Company. Rocky Mountain Arsenal:  The site was completed December 1942, operated by the United States Army throughout the later 20th century and was controversial among local residents until its closure in 1992.
United States Army