Background

The 2,165-acre Norton Air Force Base site in San Bernardino, California, served as a major overhaul center for jet engines and aircraft repair beginning in 1942. Past hazardous material management practices contaminated groundwater and soil with polychlorinated biphenyls (PCBs), dioxins, heavy metals (such as lead) and acids. Following construction of the site’s remedy, operation and maintenance activities and monitoring are ongoing.