The provisions of §§ 14a.31-14a.38 (relating to inside building storage) apply to unenclosed tanks and tanks enclosed in unfilled vaults within buildings. When tanks are placed in filled enclosures, they shall meet the provisions of this chapter for underground tanks.
34 Pa. Code § 14a.31
This section cited in 34 Pa. Code § 14a.161 (relating to general provisions).