DuPont Chambers Works
FUSRAP Site

History & Location

From 1942 to 1947, E.I. du Pont de Nemours and Company (DuPont) contracted with the Manhattan Engineer District, and later the Atomic Energy Commission, to produce, refine and process uranium. Operations resulted in residual radioactive contamination in surface and subsurface soil at portions of the Site. COCs include U-234; U-235; U-238; Th-230; Ra-226 (more than 10,000 pCi/g); tetraethyl lead; BTEX; VOCs; and other heavy metals (cadmium and arsenic).

Significant Project Features

• Excavation of over 37,000 CY of radiologically and chemically contaminated soil to depths up to 16 ft bgs
• Operations on a 130-year-old active chemical manufacturing facility under CISA security controls
• Contaminates include uranium, thorium, radium, chlorinated and fluorinated compounds (PFAS/PFOAs), dioxan/furans, BTEX, TEL, naphthalene and assorted aromatic hydrocarbons, and a range of herbicides and pesticides
• Installation of 1444 LF of steel sheeting to depths of 50-ft BGS for excavation support as well as to control ground water from entering the excavation areas
• Retrofit, operate, and maintain the existing on-site 80 GPM WWTP. To date over 12.1M gallons of water have been treated
• Operate and maintain an on-site radiological laboratory with over 13,500 samples processed and analyzed to date
• Characterized, packaged, and shipped >420 gondola rail cars of excavated soils for off-site treatment and disposal; treatment methods include pozzolanic stabilization, chemical oxidation, and thermal
• Sevenson has worked >199,000 hours and 930 consecutive days without loss-time

Project Gallery