Public Notice: Arrowhead Refinery Site Five-Year Review

Summary

EPA is conducting a five-year review of the Arrowhead Refinery Superfund site. The five-year review is an opportunity for you to tell the EPA about site conditions and any concerns you have.

EPA's cleanup plan at the site included excavation, treatment, and off-site disposal of sludge and filter cake, excavation and off-site disposal of soils and sediments, and groundwater extraction and treatment. Construction of the final remedy took place between 1991 and 1996.

In September 2021, the Arrowhead Refinery site was deleted from the National Priorities List. The NPL tracks the nation’s most contaminated sites that threaten human health or the environment. EPA determined that cleanup at the site is now complete, and no further action is necessary other than continued site inspections, land and groundwater use restrictions and five-year reviews. A proposed or final deletion does not prevent future actions under the Superfund law.