2 Ill. Adm. Code 1620.1480
Service of Pleadings
Section
1620.1480
Service of Pleadings
a) Manner
of Service. When copies of papers filed with the Commission are required to be
served on the opposing party, these copies shall be served personally, by first
class mail, or in a manner agreed to by the parties and approved by the
Administrative Law Judge.
b) Proof
of Service. Proof that copies were served on the opposing party must be filed
with the papers required to be filed with the Commission. Proof of service
shall consist of the statement of the individual making service specifying the
manner and date of the service.