The Santa Susana Field Laboratory Site Remediation Program National Aeronautics and Space Administration Groundwater Phase 1 CMS and Statement of Basis
3 Documents in Project
Summary
SCH Number
2013111068
Lead Agency
California Department of Toxic Substances Control
(DTSC)
Document Title
The Santa Susana Field Laboratory Site Remediation Program National Aeronautics and Space Administration Groundwater Phase 1 CMS and Statement of Basis
Document Type
NOD - Notice of Determination
Received
Posted
1/21/2026
Document Description
The Department of Toxic Substances Control (DTSC) has approved the National Aeronautics and Space Administration (NASA) Final Phase 1 Groundwater Corrective Measures Study (Phase 1 GW CMS) dated January 4, 2024 and released the Final DTSC Statement of Basis (SB) dated January 2026 for the NASA Phase 1 GW CMS and selection of final remedies for the four Target Treatment Areas (TTAs) of groundwater and bedrock vapor contamination at the NASA administered federal property at the Santa Susana Field Laboratory (SSFL). The final remedy for the cleanup of contaminated groundwater and bedrock at the SSFL is being conducted under the 2007 Consent Order for Corrective Action between DTSC and the SSFL Responsible Parties (NASA, the U.S. Department of Energy, and The Boeing Company).
The treatment technologies selected to address high concentrations of trichloroethene (TCE) and its breakdown products in groundwater and bedrock vapor in the TTAs include groundwater pump and treat, enhanced in-situ bioremediation, and bedrock vapor extraction.?DTSC will also oversee the implementation of monitored natural attenuation and a land use covenant to restrict land use.
The NASA Phase 1 Groundwater cleanup is part of the overall program for soil and groundwater remediation activities and the removal of structures under DTSC oversight at the approximately 2,850-acre SSFL site, as described in the Final Program Environmental Impact Report certified on July 19, 2023. The overall program will be implemented through DTSC’s issuance of individual decision documents associated with remediation plans prepared by the Responsible Parties.
Contact Information
Name
Mindy Mathias
Agency Name
Department of Toxic Substances Control
Job Title
Supervising Hazardous Substances Engineer I
Contact Types
Lead/Public Agency
Phone
Name
Peter Zorba
Agency Name
National Aeronautics and Space Administration
Job Title
NASA SSFL Project Director
Contact Types
Project Applicant
Phone
Email
Location
Cities
Simi Valley
Counties
Ventura
Regions
Citywide, Countywide, Southern California
Cross Streets
Multiple
Total Acres
2850
State Highways
118
Airports
None
Schools
Multiple
Waterways
None
Notice of Determination
Approving Agency
Department of Toxic Substances Control
Approving Agency Role
Lead Agency
Approved On
County Clerk
Ventura
Final Environmental Document Available at
https://dtsc.ca.gov/santa_susana_field_lab/ssfl_document_library/
Department of Toxic Substances Control
Site Mitigation & Restoration Program
9211 Oakdale Avenue
Chatsworth, CA 91311
Determinations
(1) The project will have a significant impact on the environment
Yes
(2a) An Environmental Impact Report was prepared for this project pursuant to the provisions of CEQA
Yes
(2b) A Mitigated or a Negative Declaration was prepared for this project pursuant to the provisions of CEQA
No
(2c) An other document type was prepared for this project pursuant to the provisions of CEQA
No
(3) Mitigated measures were made a condition of the approval of the project
Yes
(4) A mitigation reporting or monitoring plan was adopted for this project
Yes
(5) A Statement of Overriding Considerations was adopted for this project
Yes
(6) Findings were made pursuant to the provisions of CEQA
Yes
Attachments
Notice of Determination
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