Section 170.630  Change-in-Service of UST Systems

a)         From a Regulated Substance to a Non-Regulated Substance:

Continued use of a UST system to store a non-regulated substance (so that it is no longer classified as an UST system) is considered a change-in-service. Before a change-in-service, owners or operators shall empty and clean the tank by removing all liquid and accumulated sludge and conduct a site assessment.  The minimum requirements for the site assessment will be two samples:  one from each end of the tanks at opposite corners to a depth 2 feet below the invert elevation of the tank and one from under each dispenser.  However, a change-in-service may only occur during the first two years, commencing with the date of installation of the tank.

b)         From a Regulated Substance to a Regulated Substance:

A change-in-service also consists of a conversion of a petroleum UST to a petroleum UST or a hazardous substance UST to a hazardous substance UST or a petroleum UST to a hazardous substance UST and vice versa.  Before a change-in-service, owners or operators shall empty and clean the tank by removing all liquid and accumulated sludge and verify that the UST system meets the requirements of a hazardous material system if being changed over to a hazardous material substance.

c)         From a Non-Regulated Substance to a Regulated Substance:

A non-UST system tank, which is used to store a non-regulated substance, may not be converted to a UST system tank unless the tank has been re-certified and is in compliance with all applicable upgrade requirements for new UST systems.

d)         A waste oil tank that is supplying fuel to a waste oil furnace and is taken out of series shall be no longer classified as a heating oil tank.  If the tank does not meet all upgrade requirements for release detection, spill, overfill and corrosion protection, then the tank shall be removed.

e)         In all the above, the equipment must be compatible with the product being stored.

(Source:  Amended at 27 Ill. Reg. 8164, effective May 1, 2003)