The Weldon Spring Quarry was mined for limestone aggregate used in construction of the ordnance works. The Army also used the quarry for burning wastes from explosives manufacturing and disposal of TNT-contaminated rubble during operation of the ordnance works. These activities resulted in contamination of the soil and groundwater at the quarry.
In 1958, the Army transferred the Weldon Spring Quarry to the Atomic Energy Commission, who used it from 1959 to 1966 as a disposal area for uranium, thorium, and radium residues from the Chemical Plant (both drummed and uncontained) and for disposal of contaminated building rubble, process equipment, and soils from demolition of a uranium processing facility in St. Louis. Radiological contamination occurred in the same locations as the nitroaromatic contamination.
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