SECTION 165:25-2-33. Approved tanks, tank design

(a)   Tanks must be properly designed and constructed, and any portion underground that routinely contains a regulated substance must be protected from corrosion as specified in referenced codes and standards. All new or replacements tanks except those excluded by regulation in this Chapter must be double wall or jacketed secondarily contained in construction to prevent the release of regulated substances to the environment during the operational life of the system.

(1)   Fiberglass-reinforced plastic tanks must conform to the standards contained in UL 1316 or ASTM D4021-86.

(2)   Steel tanks clad with fiberglass-reinforced plastic must conform to the standards contained in UL 1746, ACT-100 F894, ACT-100-U F961, or STI F922.

(3)   Tanks constructed of steel and cathodically protected must conform to the standards in UL 58, UL 1746, STI-P3^®, STI F841, and NACE RP-0285 and must be protected in the following manner:

(A)   The tank must be coated with a suitable dielectric material.

(B)   Field-installed cathodic protection systems must be designed by a corrosion expert.

(C)   Impressed current systems must be designed to allow determination of current operating status as required by this Chapter and manufacturer's specifications.

(D)   Cathodic protection systems must be operated and maintained according to this Chapter and manufacturer's specifications.

(b)   PSTD may permit alternative types of tank construction, design, and corrosion protection if the owner demonstrates to PSTD's satisfaction that the proposed system will prevent the release of any stored regulated substance to the environment during the operational life of the system.

(c)   All underground storage tank systems must be properly installed in accordance with a code of practice developed by a nationally recognized association or independent testing laboratory and in accordance with the manufacturer's instructions.

[Source: Added at 21 Ok Reg 2036, eff 7-1-04; Amended at 22 Ok Reg 1730, eff 7-1-05; Amended 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]