After weighing the testimony received at the public hearing on the DEIS, and undertaking whatever further investigation in response to that testimony seems necessary, the department may convert a DEIS to an FEIS. This may be accomplished by replacing the cover sheet, modifying the statement as judged appropriate to reflect information received at public hearing or while the hearing record was kept open, and by adding an appendix which records and responds to information, concerns, views, arguments, and suggestions received at the hearing and while the hearing record was kept open.
Wis. Admin. Code Department of Corrections DOC 335.10