The California Department of Toxic Substances Control (DTSC) has announced the release of the NASA Phase 1 Groundwater Corrective Measures Study (CMS) 
and the DTSC Statement of Basis for the groundwater cleanup at the Santa Susana Field Laboratory (SSFL) — key documents under the Resource Conservation and Recovery Act (RCRA) cleanup process.
The NASA Phase 1 Groundwater CMS evaluates potential cleanup approaches for addressing areas within NASA-administered portions of SSFL with the highest concentrations of trichloroethylene (TCE) in groundwater and bedrock, and recommends preferred methods to achieve a cleanup that protects public health and the environment. The DTSC Statement of Basis outlines the proposed remedy for the Phase 1 groundwater cleanup effort.
DTSC is inviting public input before making a final decision on the proposed remedy. The public comment period runs from April 29 to June 10, 2025. In addition, DTSC will host a public meeting on the Phase 1 Groundwater CMS and Statement of Basis from 6:00 to 8:00 p.m. on Tuesday, May 13, 2025.
For more information, including how to submit comments and register for the public meeting, visit DTSC’s NASA Phase 1 Groundwater CMS and Statement of Basis webpage.
NASA has prepared a Phase 1 Groundwater CMS fact sheet summarizing the target treatment areas and the recommended cleanup methods.
The latest edition of FieldNOTE showcases NASA’s continued progress with environmental cleanup at the Santa Susana Field Laboratory (SSFL). Highlights include updates on groundwater cleanup efforts, including findings from NASA’s groundwater pilot studies and details about an upcoming DTSC-hosted public meeting on NASA’s groundwater cleanup plans. It also features an update on the SSFL soil backfill study, and recent milestones in the Coca Test Area demolition, including the transfer of historic artifacts to national museums for potential future display.
NASA is pleased to announce the release of its 2024 Year in Review, highlighting key milestones and progress with the environmental cleanup of the Santa Susana Field Laboratory (SSFL). This review details advancements made in 2024 in the areas of groundwater remediation, soil cleanup planning, demolition, and cultural resources management.
NASA remains committed to building on this progress in 2025 as we work toward a cleanup at SSFL that protects public health and the environment, incorporates the best available science and technology, and preserves the site’s natural and Native American cultural resources for future generations.
Notable achievements from 2024 include:
NASA has completed demolition of Coca Test Stand 1 at the Santa Susana Field Laboratory (SSFL), marking the conclusion of Phase 7 of NASA’s demolition program and bringing the agency closer to a final, comprehensive cleanup of the federally owned portion of the SSFL site. As a testament to the important role the Coca Test Stands played in our nation’s space flight program, several historical artifacts from the Coca Test Stands have been acquired by the California Science Center in Los Angeles and the Smithsonian National Air and Space Museum in Washington, D.C., for potential future display. The Coca Test Stands supported historic space exploration programs such as the 1960s Apollo Program that sent astronauts to the Moon, as well as the Space Shuttle Program in the 1980s. Previous demolition activities in the Bravo Test Area resulted in the transfer of the flare stacks from the Bravo Test Stands to the Air Force Flight Test Museum at Edwards Air Force Base.
For a virtual interactive tour of all the former Test Areas at SSFL, visit National Park Service SSFL Virtual Tour .
View a time-lapse video showing the demolition of Coca Test Stand 1 below.
Coca Test Stand 1 Demolition Time-lapse
The period of the time-lapse is from February 22 to September 6, 2024. The demolition started with the deployment of a 300-ton crane to the Coca 1 Test Stand. The demolition team began at the top of the more-than-200-foot structure and dismantled it section by section. The crane lifted the sections from the top of the test stand and moved them onto the ground. The metal flame bucket at the bottom was cut into sections using a torch, and the pieces were removed section by section. Throughout the demolition process, all demolition waste was characterized and sent to licensed disposal facilities, and the steel was recycled as much as possible.
NASA has published its latest edition of the FieldNOTE Newsletter for NASA’s cleanup activities at the Santa Susana Field Laboratory. The Fall 2024 FieldNOTE provides an update on NASA’s Groundwater cleanup documents, an update on the progress with Phase 7 demolition, and provides information about a soil backfill study taking place this fall.
The Spring 2024 FieldNOTE provides an update on the Groundwater U workshop series and onsite tour, introduces NASA’s new Groundwater Project Manager, provides an overview of NASA’s groundwater cleanup process and progress, and includes an update on demolition of the Coca Test Stands, with photos.
Throughout 2023, NASA continued to make headway toward cleanup of its portion of the Santa Susana Field Laboratory (SSFL). The 2023 Year in Review describes activities in the areas of groundwater and soil cleanup, demolition, and cultural resources management. NASA looks forward to a new year of significant progress as we move closer toward our goal of achieving a cleanup that is protective of the community and the natural environment.
The Department of Toxic Substances Control (DTSC), in coordination with NASA, Boeing, and the U.S. Department of Energy (DOE), has invited the public to participate in an online listening session to prepare for the upcoming Groundwater U (Groundwater University) workshop series focused on groundwater at SSFL. The Listening Session will take place from 6-8 p.m. on Tuesday, Jan. 23. Interested stakeholders will have the opportunity to ask questions and provide input about the upcoming Groundwater U Workshops.
You can attend by registering for the Remote meeting (Zoom) . The public is also invited to complete an online survey to provide input on the Groundwater U sessions.
NASA is committed to protecting human health and the environment in all activities and is implementing an agency-wide initiative to identify past uses and possible source locations of Per- and Polyfluoroalkyl Substances (PFAS) at NASA centers and associated facilities, including the SSFL. Currently, PFAS are classified as unregulated or “emerging” contaminants, which have no federal or state of California regulatory standards or routine water quality testing requirements. PFAS have been used in hundreds of industrial and commercial products since the 1950s, including nonstick cookware, water-repellent clothing, stain resistant fabrics and carpets, consumer packaging, and some firefighting foams. Due to their widespread use in everyday products, PFAS chemicals are prevalent in the environment.
As part of the agency’s forward-leaning approach, NASA conducted a Preliminary Assessment (PA) at SSFL in 2021, which identified areas where potential PFAS releases may have occurred. In 2022, NASA began a Site Investigation (SI) to determine the presence or absence of PFAS in soil and groundwater in or near the areas of potential concern that were identified in the PA. None of the surface or subsurface soil samples exceeded EPA screening levels for residential soil exposure scenario. Some groundwater samples within six historically active operational locations areas exceeded EPA screening levels for a residential tap (drinking) water exposure scenario. Most of the screening level exceedances are minor, localized, and consistent with limited historical use of PFAS in some NASA areas. The groundwater beneath SSFL is not used for drinking water and there is no indication that PFAS are migrating in groundwater beyond the NASA property lines. Consistent with the agency-wide approach, NASA will conduct additional groundwater sampling to further understand the nature and extent of PFAS in NASA areas. NASA has shared the results of SI with DTSC and will continue to monitor the federal and State of California PFAS regulatory status and will implement regulatory requirements and protective measures as necessary.
NASA has developed a fact sheet summarizing the status of its PFAS investigation at SSFL. NASA has also made available the full NASA SSFL PFAS Site Investigation Report.
The latest edition of NASA's FieldNOTE Newsletter is now available for review. This edition provides an update on NASA’s progress with Coca demolition, and update on the status of development of NASA’s groundwater cleanup plans, NASA’s onsite Bedrock Vapor Extraction (BVE) treatability study, NASA’s planned evaluation of soil backfill options and lab capabilities, and brush-clearing preparations for wildfire season.
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