EPA Superfund cleanup drags on After seven years, the U.S. Environmental Protection Agency (EPA) is still only making preparations to address a site contaminated with toxic materials in Newark. EPA has extended the public comment period to January 20, 2021 on its proposed cleanup plan for the Riverside Industrial Park Superfund site on the bank of the Passaic River in Newark. The proposed plan includes a combination of technologies and methods to address the cleanup of contaminated soil, soil gas (gas trapped in the soil), groundwater, sewer water and waste at the site. The Riverside Industrial Park Superfund site is located on a 7.6-acre active industrial property that includes both current and former manufacturing and packaging facilities.