632744_84945001_Thums_UIC
Summary
SCH Number
2026010493
Public Agency
California Department of Conservation
(DOC)
Document Title
632744_84945001_Thums_UIC
Document Type
NOE - Notice of Exemption
Received
Posted
1/16/2026
Document Description
THUMS Long Beach Co. (THUMS) proposes a non-expansion project consisting of twelve (12) active and idle Oil & Gas wells that, with project approval, will be converted to injection (CTI). The main objective of this water injection project is to economically maximize oil recovery and manage subsidence within the permitted area. This project is implemented in accordance with all county, state, and federal safety and environmental rules and regulations.
The proposed project consists of the California Department of Conservation, Geologic Energy Management Division (CalGEM) issuing one revised project approval letter (PAL) to THUMS Long Beach Co. for the modification of Underground Injection Control (UIC) project No. 84945001, located within the Wilmington Oil Field in Los Angeles Offshore County. The list of injection wells that would be associated with the modified UIC project are included in the table below.
API: 0423722888 Well Name: B-329
API: 0423720540 Well Name: B-335
API: 0423722392 Well Name: B-336
API: 0423723619 Well Name: B-425
API: 0423723180 Well Name: B-426
API: 0423720239 Well Name: B-103
API: 0423723669 Well Name: B-216
API: 0423720023 Well Name: B-301
API: 0423721781 Well Name: B-306
API: 0423722103 Well Name: B-311
API: 0423726969 Well Name: D-526
API: 0423721905 Well Name: B-592
Contact Information
Name
Maggie Harrington
Agency Name
Department of Conservation, Geologic Energy Management Division
Job Title
Analyst II
Contact Types
Lead/Public Agency
Phone
Email
Name
Andrew Cochrane
Agency Name
THUMS Long Beach Co.
Job Title
Agent
Contact Types
Project Applicant
Address
Phone
Email
Location
Coordinates
Cities
Los Angeles
Counties
Los Angeles
Regions
Southern California
Township
05S
Range
12W
Section
08
Base
SB
Other Location Info
Wilmington Oil Field, Los Angeles Offshore
Other Information
Fault Block VIII
Notice of Exemption
Exempt Status
Categorical Exemption
Type, Section or Code
Class 1; 14 CCR §§ 15301, 1684.1
Reasons for Exemption
Class 1 applies because the proposed project consists of “minor alterations” to 12 existing oil and gas production wells involving “negligible or no expansion of existing or former use” (14 CCR § 15301). The project would make negligible changes to the UIC project by converting 12 existing oil and gas production wells to waterflood injection. This work is part of a non-expansion infill package and would be subject to the terms of the existing project approval letter (PAL). The project would take place on artificial offshore islands and would not involve the construction of new facilities or the expansion of existing facilities. The Los Angeles Regional Water Quality Control Board reviewed the project for groundwater impacts and issued a No Objection Memo on February 19, 2025. Therefore, there would be a negligible change in existing use.
Exempt Status
Categorical Exemption
Type, Section or Code
Class 2; 14 CCR § 15302
Reasons for Exemption
Class 2 applies because the proposed project consists of the “reconstruction of existing structures and facilities where the new structure will be located on the same site as the structure replaced and will have substantially the same purpose and capacity as the structure replaced” (14 CCR § 15302). The project would reconstruct the wellbores of 12 existing oil and gas production wells to convert them to waterflood injection. The work would take place on existing wells located on existing offshore islands.
Exempt Status
Categorical Exemption
Type, Section or Code
Class 4; 14 CCR §§ 15304, 1684.2
Reasons for Exemption
Class 4 applies because the proposed project would result in “minor alterations with negligible or no permanent effects to the existing condition of the land, water, air, and/or vegetation” (14 CCR § 1684.2). The project would make minor alterations to 12 existing oil and gas production wells to convert them to waterflood injection. The project would take place on offshore artificial islands dedicated to oil and gas production. The project does not include the construction or expansion of existing facilities. Therefore, there would be negligible impacts to the surrounding environment.
Attachments
Notice of Exemption
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