The Fire Marshal may, in his or her sole discretion,
delegate fire inspection authority to personnel employed by any large
integrated industrial concern or other authorized agency which, in
his or her sole opinion, maintains adequate fire-protection and fire-prevention
services. The Fire Marshal shall investigate, at any time or interval
that he or she may deem necessary, to determine that the firesafety
standards so maintained are substantially equivalent to the modified
provisions of this chapter.