California Code, Civil Code - CIV § 1102.15

The seller of residential real property subject to this article who has actual knowledge of any former federal or state ordnance locations within the neighborhood area shall give written notice of that knowledge as soon as practicable before transfer of title.

For purposes of this section, “former federal or state ordnance locations” means an area identified by an agency or instrumentality of the federal or state government as an area once used for military training purposes which may contain potentially explosive munitions. “Neighborhood area” means within one mile of the residential real property.

The disclosure required by this section does not limit or abridge any obligation for disclosure created by any other law or that may exist in order to avoid fraud, misrepresentation, or deceit in the transfer transaction.