Beginning in 1995, the Midlands Aiken Environmental Affairs office of DHEC became the home base for Environmental Surveillance and Oversight Program (ESOP) . This program was established through an agreement between the Department of Energy-Savannah River (DOE-SR) and DHEC to provide non-regulatory, environmental monitoring of the Savannah River Site, a post-Cold War-era nuclear material production facility that is on a 310-square mile area located 20 miles south of Aiken.