THUMS D-505 Well Sidetrack Program at Island Freeman

The THUMS D-505 Well Sidetrack Program involves the rework and sidetracking of well D-505, identified by API number 0423720265, located at Island Freeman in the Wilmington Oil Field. Authorized under CalGEM permit 7056642, the project scope includes adding pay from an existing well head, reconstructing casing and wellbores on existing pads, and performing remedial operations to address well integrity issues. The project is designed to be executed without the need for new or expanded facilities. The California Department of Conservation's Geologic Energy Management Division has issued a Notice of Exemption for this project, determining it is exempt from full environmental review under the California Environmental Quality Act based on several categorical exemptions for existing facilities and minor alterations. Because the project is located within a Health Protection Zone, it must strictly adhere to the health, safety, and environmental requirements mandated by SB 1137 and Public Resources Code section 3280. The project is managed by the State of California Natural Resources Agency and was certified on July 20, 2026.