ABSTRACT
The Weldon Spring site is part of the former Weldon Spring Ordnance Works used by the U.S. Department of the Army for the manufacture of TNT and DNT in the 1940s. The site is located about 23 km southwest of St. Charles, Missouri, and about 48 km west of St. Louis. In the mid 1950s, 81 ha of the Ordnance Works was transferred to the U.S. Atomic Energy Commission (AEC) for construction and operation of a uranium and thorium processing facility (now called the chemical plant). During operations, which ceased in 1966, radioactive sludge residues (raffinates) were stored in four onsite pits (the raffinate pits). A nearby quarry, located 7 km south of the plant, was used to store other contaminated material and rubble. The locations of the quarry, raffinate pits, and chemical plant are shown in Figure 1. Map of the Weldon Spring raffinate pits site and quarry site. https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9780203753361/397efee7-0eb8-4790-a80e-a08f85eed77f/content/fig46_1.tif" xmlns:xlink="https://www.w3.org/1999/xlink"/>
