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Secondary Containment Systems

Secondary Containment Construction

Anyone who stores over 5,000 gallons of liquid fertilizer in Ohio for more than 30 days is required to have an approved secondary containment system in place. This approval can be obtained by submitting a drawing of the proposed dike area along with the completed application. Plans for secondary containment must meet all applicable zoning regulations, building standards, and fire codes, and be approved by the Ohio Department of Agriculture.

Containment Guidelines

The storage tanks must comply with the following requirements:
  • the tanks must be equipped with a lockable liquid level gauging device
  • the tanks must be secured to prevent flotation
  • each tank must have its designed capacity and the identity of its contents stenciled on a visible side of the tank
  • each tank must have a lockable shutoff valve
Appurtenances (plumbing, pumps, valves, gauges, fittings, etc):
  • must be inside the diked area or have a separate means of containment
  • all hoses for loading and unloading must have a shut-off valve
  • must be supported to prevent sagging & protected to prevent damage
All secondary containment shall:
  • have 10% more volumetric capacity than the largest storage tank located within the containment area
  • not have a tank over 15 feet tall less than four feet from the base of the containment
  • be constructed of materials to prevent vertical movement of fertilizer at a rate not to exceed thirty five hundredths of an inch per day (
Checks and/or inspections are needed:
  • weekly for equipment
  • monthly for a visual inspection of the exterior surfaces
  • monthly for all spill equipment
  • yearly using an API 653 checklist for the exterior of the tanks
  • once every five years using an API 653 checklist for the interior of the tanks
Records are required:
  • weekly for recording the liquid level of each tank with fertilizer in it
  • whenever there is a discharge of fertilizer outside the containment area
  • for all repairs and maintenance work performed on each tank