30 CFR §56.4130
- (a)If a hazard to persons could be created, no combustible materials shall be stored or allowed to accumulate within 25 feet of the following:
- (1)Electric substations.
- (2)Unburied, flammable or combustible liquid storage tanks.
- (3)Any group of containers used for storage of more than 60 gallons of flammable or combustible liquids.
- (b)The area within the 25-foot perimeter shall be kept free of dry vegetation.