83 Ill. Adm. Code 535.240
Certification of Equipment
Section 535.240 Certification of Equipment
A public utility, independent contractor, or their agents
shall follow the manufacturer’s testing, maintenance, and certification
recommendations for all mercury vapor testing equipment used to test for the presence
of mercury vapor and shall keep the records of such testing, maintenance and
certifications for five years after its last mercury vapor test required by
Section 535.200.