1. (a) All tanks out of service for more than twelve (12) months are required to be tightness tested and test results submitted to PSTD before returning to service.
2. (b) A tightness test must be performed by a licensed tester and must be completed on the underground portion of out of service systems if more than twelve (12) months have elapsed since the last tightness test. Any system failure will require either closure or upgrade of the failed portion.
3. (c) All systems out of service for more than twelve (12) months are required to meet all the requirements of this Chapter.
4. (d) All underground storage tanks being used as aboveground storage tanks that have been out of service for more than twelve (12) months may not be returned to service.

Renumbered from 165:26-2-215 at 23 Ok Reg 2297, eff 7-1-06

Amended at 32 Ok Reg 794, eff 8-27-15

Amended at 35 Ok Reg 1010, eff 10-1-18

Amended at 36 Ok Reg 576, eff 8-1-19

Amended at 39 Ok Reg 965, eff 10-1-22

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