40 C.F.R. § 35.4025
You can make your group eligible by establishing an identity separate from that of the PRP or other ineligible entity by making a reasonable demonstration of independence from the ineligible entity. Such a demonstration requires, at a minimum, a showing that your group has a separate and distinct:
(b) Substantive existence (meaning, is not affiliated with an ineligible entity), including its own finances.
(1) In determining whether your group has a different substantive existence from the ineligible entity, you must establish for us that your group: