Ill. Admin. Code tit. 2 § 576.330
The Freedom of Information Officer shall deny requests for public records by giving written notice to the requestor of the decision to deny the request, the specific reasons for denial, and the names and titles of individuals responsible for the denial. That notice shall inform the requestor of the right to appeal that denial to the Attorney General. Categorical requests creating an undue burden on the Attorney General's office shall be denied only after extending to the requestor an opportunity to confer with the Freedom of Information Officer in an attempt to reduce the request to manageable proportions. All notices of denial sent by any Freedom of Information Officer shall also be sent to the Freedom of Information Officer in the Springfield office where they shall be kept in a single central office file which shall be open to the public and indexed according to the type of exemption asserted and, to the extent feasible, according to the types of records requested.
Ill. Admin. Code tit. 2, § 576.330