Minn. R. 1513.0370
PROTECTION OF CONTAINER AND APPURTENANCES
Containers and appurtenances must be located or protected by suitable barriers so as to avoid damage by trucks or other vehicles. Main container shut-off valves and riser hose end valves must be kept closed and locked when the installation is unattended. If the facility is protected against tampering by fencing, valve locks are not required. All connections to underground containers must be located within a dome, housing, or manhole fitted with a substantial removable cover. Storage containers need not be electrically grounded.