Imminent and Substantial Endangerment Determination and Consent Order – Area I Burn Pit Area Cleanup


SCH Number
Public Agency
Department of Toxic Substances Control
Document Title
Imminent and Substantial Endangerment Determination and Consent Order – Area I Burn Pit Area Cleanup
Document Type
NOE - Notice of Exemption
Document Description
The purpose of this project is the removal of soil contaminated with hazardous substances, including cadmium, mercury, molybdenum, nickel, zinc, PCBs (Aroclor-1248 and Aroclor-1254), dioxins, pentachlorophenol, and trichloroethylene (TCE) in an approximately 5.8 acre site, the Area I Burn Pit Area, that formerly consisted of two burn pits, three earthen ponds, three concrete-lined ponds including an acid pit, a former Fire Department Demonstration Area, an entrance shack and related storage area, a control center, and two explosive storage sheds. The Area I Burn Pit Area also contains levels of radionuclides above the January 30, 2013, Draft Provisional Radiological Lookup Table Values (“LUTVs”).

Contact Information

Mindy Mathias, P.E.
Agency Name
Department of Toxic Substances Control
Job Title
Unit Chief, Santa Susana Field Laboratory Unit
Contact Types
Lead/Public Agency


Simi Hills
Citywide, Countywide, Southern California
Cross Streets
Santa Susana Field Laboratory
Total Acres
Other Location Info
Located within the boundaries of the Santa Susana Field Laboratory

Notice of Exemption

Exempt Status
Emergency Project
Type, Section or Code
Sec. 21080(b)(4); 15269(b)(c)
Reasons for Exemption
This project consists of removal actions necessary to prevent or mitigate an emergency, determined by DTSC to be “an imminent or substantial endangerment to the public health or welfare or to the environment, because of the release or a threatened release of a hazardous substance…” (Health and Safety Code section 25358.3(a)) Releases of hazardous substances are threatened to occur from increasingly frequent and severe precipitation, wind, and fire events in the Ventura County area. The site currently employs geotextile fabric as a mitigation measure to prevent off-site migration and exposure to ecological receptors. However, this mitigation is temporary and the combination of time and severe weather is likely to lead to harmful run-off and migration of hazardous substances absent permanent mitigation measures. Hazardous materials at the site, including PCBs, cadmium, and dioxins, pose an unacceptable risk to ecological receptors, including potentially significant impacts on wildlife.
County Clerk


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