A uniformly stable, firm and flat foundation plus a secondary containment bund is the ideal setup for Coerco poly diesel storage tanks.
Your diesel storage tank must be placed on a uniformly stable, firm, and flat base to avoid possible failure and tank fatigue.
Additionally, a secondary containment bund may be necessary to prevent diesel from leaking into the ground and contaminating the soil or any water source. Requirements for the bund design are outlined here: The New Way to Bulk up On Diesel and Save.
Note that Coerco poly diesel storage tanks only comply with Australian Standards AS1940:2017 once you’ve installed it in an approved bund. Contact your bulk fuel supplier for approval prior to ordering bulk fuel.