A vault is allowed above or below grade and must meet NFPA 30 and NFPA 30A requirements.

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 34 Ok Reg 958, eff 9-11-17