The Environmental Protection Agency:
DALLAS – (Oct. 11, 2017) The cleanup plan to address highly toxic dioxin contamination at the San Jacinto Waste Pits Superfund site in Harris County, Texas has been approved. The selected remedy will protect human health and the environment by removing highly contaminated material from the site and securing less contaminated areas. The plan provides certainty to people living near the site by permanently addressing risk posed by the contamination. It also provides certainty to other economic interests including the businesses that rely on the San Jacinto River for navigation and the Interstate-10 transportation corridor.
“Today, we are announcing our decision to ensure the San Jacinto site is cleaned up for the benefit of the entire community,” said EPA Administrator Scott Pruitt. “As exemplified today, EPA is prioritizing Superfund clean-up by making decisions in a decisive, timely manner. The San Jacinto Waste Pits site was added to the National Priority List nearly a decade ago, and I am pleased to announce a decision has been made to permanently address the highly toxic materials to ensure health and safety in the surrounding communities.”
EPA’s cleanup plan includes installing engineering controls such as cofferdams before excavating almost 212,000 cubic yards of dioxin contaminated material for disposal. A small amount of material will stay on the site where controls will prevent access, eliminate off-site migration and monitor the natural recovery into the future. The estimated cost for the remedy is $115 million and is cost-effective; representing a reasonable value for the cost incurred.
EPA’s final cleanup plan, called a Record of Decision, addresses comments on the proposed plan concerning the risk of water spreading dioxin contamination downstream by installing controls such as cofferdams to allow for dry excavation of the waste material. Changes in the construction method will effectively eliminate any potential for spreading contamination to downstream areas. The $97 million proposed plan outlined wet excavation of material.
The Superfund site consists of two sets of impoundments, or pits, built in the mid-1960s for disposing solid and liquid pulp and paper mill wastes that are contaminated with polychlorinated dibenzo‑p‑dioxins (dioxins) and polychlorinated dibenzofurans (furans). In 2011, the impoundments were covered with an armored cap as a temporary way to contain the contaminants.