secondary containment polyethylene containers double wall storage tank SECONDARY CONTAINMENT BASINS ACO Container Systems, operating from Pickering, Ontario, produces a line of polyethylene basins and steel stand “teams” for use with IBCs and tanks of all shapes. General secondary containment capacity guidelines are to have a minimum of 110% of the intended primary container – the IBC in this case. ACO manufactures a 300 imperial gallon basin for this application. Inner tank’s unique dome interlocks with outer tank’s side wall to seal secondary containment area from unwanted materials. Lifting lug assemblies, designed to hold up to twice the empty tank’s weight, are standard.