Interim Removal Action (IRA) Pursuant to Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) at Installation Restoration Program (IRP


SCH Number
Public Agency
California Department of Toxic Substances Control (DTSC)
Document Title
Interim Removal Action (IRA) Pursuant to Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) at Installation Restoration Program (IRP
Document Type
NOE - Notice of Exemption
Document Description
Up to 360 trees will be planted in 4 foot deep holes, in three rows, and spaced at 15-foot intervals within an area of about 1,350 feet by 50 feet. Standard engineering and construction practices will be used to minimize potential environmental impacts during tree planting activities. Excavated soils will be used to backfill the hole and form an irrigation berm around each tree. The effectiveness of the phytoremediation barrier will be determined from analysis of groundwater samples from monitoring wells. The samples will be collected and analyzed quarterly for each year after installation. Up to ten new wells will be constructed and used, together with three existing wells, for monitoring purposes. No final cleanup goals have been set for this IRA. The final remedy to remediate the contaminated groundwater at this site will be selected in the feasibility study phase. The proposed IRA is designed, however, to be compatible with and potentially comprise the final remedy at Site 32 Cluster.

Contact Information

Quang Than
Agency Name
Department of Toxic Substances Control
Contact Types
Lead/Public Agency


Santa Barbara

Notice of Exemption

Exempt Status
Type, Section or Code
Section 15061(b)(3)
Reasons for Exemption
The proposed remedial action has only limited activities. It will not create any significant environment impact because: 1. The site is located within the boundaries of Vandenberg AFB, an isolated, active military installation. The area in which Site 32C is located is in a remote area in the northern hald of the base. There is not access available to the area by the general pubilic, and access by non-essential personnel will be restricted during tree planting activities. The nearest potential residential receptors at the Military Family Housing are more than 3.5 miles away. The nearest city, the city of Lompoc, is about ten miles away. 2. The tree planting activities will have minimal impact to the surrounding habitats. The planting area is sparsely vegetated and efforts will be taken to disturb as little as possible the flora and fauna in the area. No sensitive or endangered species exist in the Site 32C area. 3. Site 32C is not located in an area known for cultural and paleotological resources. The contractor will obtain a site-specific work permit or dig permit from the Base, which requires clearance from the Base Cultural Resources for Native American burial sites, archaeological, historical, etc., before tree planting begins. 4. No soil will be removed from the site as a result of tree planting activities. Excavated soil will be used to backfill the hole and as an irrigation berm around the tree. A very small amount of soil will be removed during the construction of up to ten new monitoring wells. This soil will be characterized and disposed of accordingly at an appropriate offsite disposal site.

Disclaimer: The document was originally posted before CEQAnet had the capability to host attachments for the public. To obtain the original attachments for this document, please contact the lead agency at the contact information listed above. You may also contact the OPR via email at or via phone at (916) 445-0613.

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