SECTION 252:616-9-2. Tank system materials

   Tank systems are classified according to their material, as follows:

(1)   Concrete. Concrete tanks shall be constructed of 3,000 pounds per square inch compressive strength concrete as determined after 28 days curing time by standard concrete compression test. Tanks may be poured in place or precast and mechanically vibrated. The bottom of all concrete tanks shall be integral with or monolithically poured with the walls.

(2)   Metal. Materials that are corrosion resistant, have protective coatings, or cathodic protection shall be used for metal underground pipe, fittings, and all tanks installed in areas where the soil resistivity is less than 12,000 ohms/centimeter. All tanks, pipes, and fittings shall be resistant to the wastewater and to their environment.

(3)   Plastic and fiberglass. Plastic and fiberglass tanks may be approved by the DEQ based on their wastewater and environmental compatibility on a case by case basis.

[Source: Added at 17 Ok Reg 1925, eff 6-12-00; Amended at 22 Ok Reg 1468, eff 6-15-05]