THUMS C-440 Well Rework Program at Island Chaffee

THUMS Long Beach CO. is authorized by the California Department of Conservation, Geologic Energy Management Division (CalGEM) under permit 7056580 to perform a rework of producing well C-440 (API 0423723774) located on Island Chaffee in the Wilmington Oil Field, Los Angeles. The scope of work involves addressing well integrity issues to protect natural resources and the environment by running a casing sleeve and inner liner, replacing internal production equipment, and returning the well to its existing use. This project is classified under Group D of the December 2023 CalGEM rework exemptions guidance. The project is exempt from full environmental review under the California Environmental Quality Act (CEQA), citing various categorical exemptions for existing facilities, replacement or reconstruction, and minor land alterations. Because the site is located within a Health Protection Zone as defined by Public Resources Code section 3280(b), the operations must comply with the health, safety, and environmental requirements of SB 1137. The project is managed by the Department of Conservation with a forecast date of July 14, 2026, and falls under NAICS code 213111.