35 Ill. Adm. Code 219.626
Storage Tanks
Section 219
Section 219.626 Storage
Tanks
a) The owner or operator shall equip tanks storing VOL with a
vapor pressure greater than 10 kPa (1.5 psi) at 20°C (68°F) with
pressure/vacuum conservation vents set as a minimum at +/1 0.2 kPa (0.029
psi). These controls shall be operated at all times. An alternative air
pollution control system may be used if it results in a greater emission
reduction than these controls. Any alternative control system can be allowed
only if approved by the Agency and approved by the USEPA as a SIP revision.
b) Stationary VOL storage containers with a capacity greater than
946 1 (250 gal) shall be equipped with a submerged-fill pipe or bottom fill.
These controls shall be operated at all times. An alternative control system
can be allowed only if approved by the Agency and approved by the USEPA as a
SIP revision.