Monitoring requirements, at a minimum, must consist of an annual line tightness test conducted no later than April 1^st of each year by a licensed tester.

Added at 23 Ok Reg 144, eff 10-6-05 (emergency)

Added at 23 Ok Reg 2297, eff 7-1-06

Amended at 41 Ok Reg, Number 23, effective 10-1-24