If it happens that after an FEIS has been prepared, the public comment period has ended, and a decision has been made on the proposed action, but before contracts have been signed or construction has begun, whichever happens first, or other implementation has begun, the department substantially changes the proposed action in environmentally significant ways, or if significant new circumstances arise or information is developed relevant to environmental concerns and having a bearing on the proposed action or its impacts, the department shall prepare a supplement to the FEIS which shall be distributed and reviewed in the same manner as the FEIS as provided in s. DOC 335.11.
Wis. Admin. Code Department of Corrections DOC 335.13