In this subchapter:

   (1)   “International joint commission” has the meaning given in s. 281.35 (1) (h).

   (2)   “Remedial action plan” means a comprehensive plan to clean up and restore the environment in a contaminated area that is in or adjacent to Lake Michigan or Lake Superior or a tributary of Lake Michigan or Lake Superior and that is identified as an area of concern by the international joint commission under the Great Lakes water quality agreement.