The Environmental Protection Agency announced Thursday that it has approved a plan to stabilize the riverbed near the San Jacinto River Waste Pits Superfund site to address the hazards of a 20,000-square foot area where Hurricane Harvey gouged a pit about 12 feet deep. At the same time, the EPA and companies responsible for the cleanup say further inspection and tests indicate that a temporary concrete cap appeared to have held during the storm and therefore a major leak of cancer-causing dioxins was averted at the site of Interstate 10 near Channelview. The San Jacinto Waste Pits is one of 43 Superfund sites in the coastal areas affected by Hurricane Harvey.