All bulk liquid fertilizer storage tanks must be stored in proper containment that is permitted by the Minnesota Department of Agriculture (MDA). The cost of a bulk storage permit application is $100.00.
Requirements at a permitted liquid bulk fertilizer storage facility include:
- An identification sign with owner’s, operator’s, or agent’s name, and telephone number must be posted where it can be easily seen and read.
- An MDA incident emergency notification sign must also be posted where it can be easily seen and read within the facility.
- All tanks must be labeled with grade/guaranteed analysis.
- All tanks must have a main valve located near the tank.
- The main valves must be adequately safeguarded (lockable or secured inside a fence or building).
- Site gauge valves must be adequately safeguarded (lockable, close automatically, or secured inside a fence or building).
- All plumbing and appurtenances must be maintained and free of corrosion. (The MDA strongly recommends using stainless steel appurtenances on plugs and on all fittings up to and including the first valve).
- All storage tanks must be maintained and free of corrosion.
- All liquid bulk fertilizer dikes must be maintained:
- Concrete dikes – All cracks and defects must be repaired
- Synthetic lined dikes – Free of tears and punctures
- Metal dikes – Free of rust and corrosion
- If plumbing is installed through a wall it must be adequately safeguarded:
- Manifold – for metal and concrete dikes
- Boot – for synthetic lined dikes
- Fencing is required for uncovered synthetic-lined dikes without vertical walls.
- Dike must be free of vegetation.
- Facilities must have on file a current contingency plan that describes the storage, handling, disposal, and incident handling practices. The MDA has fact sheets available to help facilities develop their own contingency plans.