THUMS (C-358) Well Rework Program at Island Chaffee

THUMS Long Beach Co. is undertaking a rework of the existing C-358 waterflood well located offshore on Island Chaffee within the Wilmington Oil Field, California, under permit number 7054991 issued by the California Department of Conservation, Geologic Energy Management Division (CalGEM). The scope of work involves plugging back the well, repairing the casing through cementing a section of the existing wellbore, and perforating a new production interval to return the well to service as a producer. This activity qualifies under Group B of CalGEM’s December 2023 rework exemptions guidance and is supported by multiple California Environmental Quality Act (CEQA) categorical exemptions, including Class 1 for maintenance of existing facilities and Class 2 for replacement or reconstruction without expansion, ensuring the project meets regulatory thresholds for environmental impact. The well, identified by API number 0423723756, operates at geographic coordinates 33.73923111 latitude and -118.13883972 longitude, and all activities are confined to the existing infrastructure without significant expansion or surface disturbance. Regulatory oversight and formal acceptance are managed exclusively by CalGEM, with no federal procurement framework, contract clauses, pricing, or delivery schedules identified in the documentation. The project is not structured as a federal contract under the FAR and lacks standard procurement elements such as contract value estimates, payment terms, invoicing procedures, COR/COTR appointments, or socioeconomic certifications. Instead, compliance is ensured through adherence to California Code of Regulations, particularly 14 CCR §§ 15301, 15302, 15304, and 1684.1, which govern minor alterations and remedial operations in oil and gas wells. The Notice of Exemption was certified on January 21, 2026, with no formal performance period or delivery schedule defined, and all communications and submissions are directed through CalGEM’s Southern District Office in Long Beach, California, using provided email and portal access for public and regulatory correspondence. No attachments, packaging requirements, or special contractual provisions beyond environmental compliance are included or required.