CA AB777

Prohibits any samples or waste generated from sites other than the Stringfellow Quarry from being treated, stored, transferred to, or disposed of at the Stringfellow Quarry Class I Hazardous Waste Disposal Site.

Requires the Department of Toxic Substances Control to notify the City of Jurupa Valley, Riverside County Board of Supervisors, and the Secretary for Environmental Protection no later than three business days before any non-Stringfellow material or substance is processed at the site, and to post notification on its website.

Exempts materials and substances necessary to implement the ongoing cleanup of the Stringfellow Quarry site itself from the notice requirement.

Establishes legislative findings that the Stringfellow Quarry was contaminated by 33 million gallons of toxic waste deposited between 1956 and 1972, with cleanup expected to take 500 years and ongoing since the 1980s.

Responds to a 2022 incident in which the department transferred lead-contaminated soil samples from the Exide Battery Plant in Los Angeles County to the Stringfellow Quarry without adequate community notification.