Ill. Admin. Code tit. 92, § 530.310
b) The Department may also give written notice that the permittee shall remove, relocate, or otherwise modify its facility.
2) Notice shall be considered to have been received if:
c) The Permittee, by use of its permit, agrees to the following:
3) That any attorney at law is authorized, on behalf of permittee, to do the following: