1. (a) When permanent closure, a change in service (excluding a change in a regulated substance), or tank or line repair, and/or replacement is completed, the owner or operator must measure for the presence of a release where contamination is most likely to be present at the aboveground storage tank system site. Please refer to the AST Closure Sampling Location Requirements document on PSTD's website.
2. (b) For tank systems containing petroleum product, analyses may be done for BTEX and TPH (GRO and/or DRO, whichever is applicable), along with total lead if appropriate.
3. (c) If contaminated soils, contaminated groundwater, or free product as a liquid or vapor is discovered, the owner must immediately begin corrective action in accordance with OAC 165:29 of Commission rules.
4. (d) All sampling must be conducted under the supervision of a Licensed Environmental Consultant.
5. (e) The requirements of this Section do not apply to aboveground storage tanks which are located in or on buildings.

Added at 21 Ok Reg 2079, eff 7-1-04

Amended at 22 Ok Reg 1752, eff 7-1-05

Amended at 25 Ok Reg 2187, eff 7-11-08

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

Amended at 34 Ok Reg 958, eff 9-11-17

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