(1) A plan may be submitted by any of the following:

(a) The owner or operator of the railroad; or

(b) A person who has contracted with the railroad to provide containment and cleanup services and who has been approved by ecology.

(2) A person may submit a single integrated plan for more than one railroad provided that all requirements of this chapter are met.

(3) A contingency plan prepared for an agency of the federal government or another state that satisfies the requirements of this chapter may be accepted by ecology.