625 ILCS 5/13-103.3
Upon the payment of a fee of $50 and the filing of an application by the proprietor of any company upon forms furnished by the Department, accompanied by proof of experience, training, and ability of the operator of the testing equipment, together with proof of approved testing equipment as defined in Section 13-102 and the giving of a bond conditioned upon faithful observance of this Section and of rules adopted by the Department in the amount of $10,000 with security approved by the Department, the Department shall issue a permit to the proprietor of the vehicle service company to operate an official portable emissions testing company. An official portable emissions testing company shall only conduct portable emissions inspections for diesel fleets with 5 or more diesel vehicles required to be inspected under subsection (a) of Section 13-109.1, and only at the fleet owner's place of business. A permit issued under this Section shall expire 12 months following its issuance, but may be renewed annually by complying with this Section and upon the payment of a renewal fee of $50 . No person or company shall operate as an official portable emissions testing company without having been issued a permit as provided in this Section.
A permittee under this Section may test second division vehicles owned, operated, or controlled by the permittee to conduct emission inspections of such vehicles in accordance with Section 13-109.1.
Each permit issued by the Department shall state on its face the location of the recordkeeping office of the proprietor of the official portable emissions testing company. However, the Department, upon application, may authorize a change in the location of the recordkeeping office. Upon the approval of such an application, the Department shall issue an endorsement to be fixed by the applicant to the permit. Such an endorsement constitutes authority for the applicant to make the change in location.
625 ILCS 5/13-103.3