EPA Characterization

EPA conducted a radiological survey and sampling program of Area IV and the Northern Buffer Zone. This study was completed in December 2012.

Final EPA Radiological Characterization Reports

Background Study

Final Historical Site Assessment, Santa Susana Field Laboratory Site, Area IV Radiological Study

Geophysical and Gamma Survey Reports

Soils Plans and Reports

Groundwater Surface Water and Sediment

Cultural Resources

Biological Studies

DOE and EPA Sign Interagency Agreement - April 23, 2009

On April 23, 2009, representatives of the U.S. Department of Energy and the U.S. Environmental Protection Agency Region IX signed an Interagency Agreement that transfers $38.3 million to EPA to be used to complete a comprehensive radiological survey in Santa Susana Field Laboratory Area IV and northern undeveloped lands.

DOE’s funds were appropriated under the American Recovery and Reinvestment Act of 2009. In July 2008, DOE transferred $1.5 million to EPA to fund a radiological background study for SSFL. In February 2009, DOE had transferred an additional $1.7 million to EPA to fund planning of the radiological survey. The $38.3 million will complete DOE funding of the EPA’s estimate of $40 million needed to complete the radiological survey.

EPA will use the funding to develop a historical site assessment to evaluate past radiological activities, conduct a surface gamma scan, and perform surface and subsurface soil sampling and a groundwater analysis. Approximately 10,000 soil and groundwater samples are expected to be analyzed. The EPA’s SSFL radiological background study and the SSFL Area IV radiological survey will be useful in evaluating cleanup options at SSFL and to support the preparation of the SSFL Area IV Environmental Impact Statement.