1. (a) When permanent closure, a change in service (excluding a change in regulated substance), or a tank or line repair and/or replacement is completed, the owner/operator must measure for the presence of a release where contamination is most likely to be present at the underground storage tank system site. Please refer to the UST Closure Sampling 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 appropriate), 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 under the supervision of a Licensed Environmental Consultant.

Added at 23 Ok Reg 2261, eff 7-1-06

Amended at 25 Ok Reg 1867, eff 7-1-08

Amended at 32 Ok Reg 780, eff 8-27-15

Amended at 34 Ok Reg 935, eff 9-11-17

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