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Pacific Southwest, Region 9: Superfund

Serving Arizona, California, Hawaii, Nevada, the Pacific Islands, and Tribal Nations

Santa Susana Field Laboratory (SSFL)

EPA #: CAN000908498

State: California(CA)

County: Ventura

City: Simi Valley

Congressional District: 0

Other Names: Rocketdyne, Energy Technology and Engineering Center (ETEC)

Bulletin Board

As of January 2013, California’s Department of Toxic Substances Control (DTSC) is the lead for all site work public engagement activities for the SSFL site. For additional information about DTSC’s community involvement program at the site, please contact Marina Perez, Public Participation Specialist, at (818) 717-6569 or e-mail her at Marina.Perez@dtsc.ca.gov.


Description and History

NPL Listing History

NPL Status: Non-NPL

Proposed Date:

Final Date:

Deleted Date:

Background. The Santa Susana Field Laboratory (SSFL) is a 2,850 acre site located in Ventura County, California, approximately 2 miles south of the City of Simi Valley and 30 miles northwest of downtown Los Angeles. The site is divided into four areas which are under different ownership. Boeing owns Areas I, III and IV. The National Aeronautics and Space Administration (NASA) owns and administers Area II and owns 42 acres of Area I. Since 1948, the principal activities in Areas I, II, and III of the SSFL have been large rocket engine research, assembly, and testing by Rocketdyne and NASA. From 1956 to 1988, the Energy Technology and Engineering Center (ETEC), which is located in Area IV was used by Rocketdyne and the Department of Energy (DOE) for nuclear energy research and development. All these past site operations have resulted in soil and groundwater contamination. Primary chemical contaminants include a variety of radionuclides, trichloroethylene (TCE), perchloroethylene (PCE), metals, and petroleum hydrocarbons.

Site Cleanup Status. Cleanup actions of chemical contamination are being conducted by DOE, Boeing and NASA under the direction and oversight of the State of California Department of Toxic Substances Control (DTSC). DTSC is using the Resource Conservation and Recovery Act (RCRA) as its regulatory authority. The extent of chemical contamination has not been fully characterized, but it is estimated that more than 500,000 gallons of TCE is beneath the Site. Radionuclides associated with ETEC nuclear operations include tritium, plutonium-238, plutonium-239, iodine-131, strontium-90, cesium-137, cobalt-60, thorium-228, and uranium-235. Decommission and demolition of ETEC buildings has been conducted by DOE pursuant to the Atomic Energy Act. In accordance with a court order in 2007, DOE stopped its cleanup work in Area IV and is now working on an Environmental Impact Statement (EIS) under the National Environmental Policy Act (NEPA).

EPA’s Role. The 2008 Federal Appropriations Law (HR2764) directed DOE to use a portion of DOE funding for the SSFL site to enter into an interagency agreement with the EPA to conduct a joint comprehensive radioactive site characterization of Area IV of the SSFL in accordance with the Comprehensive Environmental Response, Compensation and Liability Act (CERCLA). This resulted in EPA taking on and completing the following two studies at SSFL:

1. Radiological Background Study. In July 2008, an Inter-Agency Agreement was signed whereby DOE gave EPA $1.5 million to commence a radiological background study for the SSFL site. The purpose of the background study is to determine “ambient or background” levels radiation found in soils not affected by the SSFL site operations. The October 2011 EPA Background Study Report is available for review in the "Investigation and Cleanup" section below and at the SSFL public information repositories listed below.

2. Radiological Study at SSFL Area IV. In June 2009, EPA and DOE amended the Inter-Agency Agreement to provide EPA an additional $40 million to fully fund a radiological study of Area IV and the adjacent northern buffer zone. The majority of the funds ($38.3 million) originate from funding allocated to DOE under the American Recovery and Reinvestment Act of 2009. A map indicating the boundaries of EPA radiological study is provided in a PDF file attached at the top of this website page. EPA's Area IV radiological study consisted of the following projects:

    Historical Site Assessment. This project consisted of EPA's independent review of documents concerning past radiological operations and past spills and releases of radiological materials at SSFL. The goal of this project was to identify the full universe of potential radiological contaminants and locations where radiological contaminants remaining in Area IV and the northern buffer zone came to be located.

    Gamma Radiation Scan. This project consisted of scanning the accessible areas of the Area IV and the northern buffer zone to identify locations of elevated gamma radiation. A gamma scanning vehicle was specially designed by EPA and constructed for this project. Any gamma radiation "hot spots" identified by the gamma scan vehicle and other scanning equipment were then sampled by EPA for full range of potential radiological contaminants.

    Testing of Soil, Groundwater and Surface Water. Based on information collected during the Historical Site Assessment and Gamma Scanning, this project consisted of testing the soil, groundwater and surface water (i.e. seep water) for a broad range of potential radiological contaminants.

EPA's final data report for the Area IV radiological study was issued in December 2012.

Radiological Technical Advisor during Cleanup of Area IV and the Northern Buffer Zone. Pursuant to administrative order on consent (AOC) between DTSC and DOE, EPA is to provide technical assistance on the radiological issues during cleanup in Area IV and the Northern Buffer Zone. Under the AOC, EPA was asked to conduct post cleanup confirmatory radiation assessment in areas where cleanup was performed to verify completion of cleanup. In addition, EPA was asked to verify that backfill/replacement soils do not exceed local background for radioactive components.

National Priorities List and the SSFL site. SSFL is not on EPA’s National Priority List (NPL) and therefore it is not considered a federal “Superfund site”. In November 2007, EPA issued a CERCLA Preliminary Assessment/Site Investigation (PA/SI) report. This report along with other information indicated that SSFL may be eligible for placement on the NPL. In December 2007, EPA sent a letter to the State of California requesting its position in this matter and in January 2009 the State decided to not support to listing SSFL on the NPL. Therefore, the California DTSC will continue in its role as lead regulatory agency at the SSFL site. As lead regulator, DTSC's role includes oversight and approval of risk assessment, clean-up levels, and clean-up actions at the SSFL site.

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Contaminants and Risks

Contaminated Media
  • Groundwater
  • Surface Water
  • Soil and Sludges
  • Environmentally Sensitive Area

Please see http://www.dtsc.ca.gov/SiteCleanup/Santa_Susana_Field_Lab/ for information on chemical contamination at the site.

Please see http://www.etec.energy.gov/char_cleanup/cleanup_index.html for information on radiological contamination at the site.

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Who is Involved

As described in the "Description and History" section of this website, this site is being addressed by State action.

The state of California agencies involved at this site include the DTSC and the Regional Water Quality Control Board (RWQCB). DTSC is the overall regulatory lead for the SSFL site. RWQCB is overseeing cleanups of soil contamination in and near site drainages that are regulated under the Clean Water Act.

Boeing, NASA and DOE are conducting investigation and cleanup work under DTSC direction and oversight.

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Investigation and Cleanup Activities

EPA's radiological studies at the SSFL site were completed.

Please see http://www.dtsc.ca.gov/SiteCleanup/Santa_Susana_Field_Lab/ for information on Investigation and Cleanup Activities done under State of California direction and oversight.

Please see http://www.etec.energy.gov/char_cleanup/cleanup_index.html for information on Investigation and Cleanup Activities of radiological contamination conducted by the Department of Energy.

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Cleanup Results to Date

Please see the Investigation and Cleanup Activities section above.

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Potentially Responsible Parties

Potentially responsible parties (PRPs) refers to companies that are potentially responsible for generating, transporting, or disposing of the hazardous waste found at the site.

To date, EPA has no role on identifying the PRPs for this site.

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Documents and Reports

Show details for Community InvolvementCommunity Involvement
Show details for Fact SheetsFact Sheets
Show details for MapsMaps
Show details for Technical DocumentsTechnical Documents

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Community Involvement

Public Meetings: During 2012, U. S. EPA transitioned its Community Involvement program to California’s Department of Toxic Substances Control (DTSC), which is the lead for all site work public engagement activities for the SSFL site. For additional information about DTSC’s community involvement program at the site, please contact Marina Perez, Public Participation Specialist, at (818) 717-6569 or e-mail her at Marina.Perez@dtsc.ca.gov. EPA has placed project documents and reports in the Information Repositories and on EPA’s web site or the DTSC web site: http://www.dtsc.ca.gov/sitecleanup/Santa_Susana_Field_Lab.

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Public Information Repositories

The public information repositories for the site are at the following locations:

DTSC Chatsworth Office Records room
9211 Oakdale Avenue
Chatsworth, California 91311
(818) 717-6521

Simi Valley Library
2969 Tapo Canyon Road
Simi Valley, California 93063
(805) 526-1735

The most complete collection of documents is the official EPA site file, maintained at the following location:

Superfund Records Center

Mail Stop SFD-7C

95 Hawthorne Street, Room 403

San Francisco, CA 94105

(415) 820-4700

Enter main lobby of 75 Hawthorne street, go to 4th floor of South Wing Annex.

Additional Links

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EPA Site Manager
Christopher Dirscherl
US EPA Region 9
Mail Code SFD
75 Hawthorne Street
San Francisco, CA 94105
EPA Community Involvement Coordinator
David Yogi
US EPA Region 9
Mail Code SFD
75 Hawthorne Street
San Francisco, CA 94105
EPA Public Information Center
State Contact
Mark Malinowski, DTSC
SSFL Performance Mgr

Marina Perez DTSC
Public Participant Spec


Sacramento Field Office
8800 Cal Center Drive
Sacramento, 95826-3200

Chatsworth Field Office
9211 Oakdale Avenue
Chatsworth, 91311-6505
PRP Contact
DOE: Stephie Jennings

NASA: Merrilee Fellows

Boeing: Phil Rutherford




Stephie Jennings,
Department of Energy
Energy Technology Engineering Center
PO Box 10300
Canoga Park, CA 91309

Merrilee Fellows
NASA Manager for Community Involvement  for Environmental Remediation
4800 Oak Grove Drive
Pasadena, CA 91109

Phillip Rutherford
Manager, Health, Safety & Radiation Services
The Boeing Company
5800 Woolsey Canyon Rd
Canoga Park, CA 91304
Community Contact

Other Contacts

After Hours (Emergency Response)
(800) 424-8802

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