A cracked concrete bund, which subsequently led to a diesel fuel leak, has landed US energy company Chevron in hot water three years later.
Chevron has been ordered to pay £11,500 (12,745) following the leak at its Poole, UK, terminal that put a nature reserve at risk of pollution.
Following the October 2006 incident the Environment Agency launched an investigation concluding that around 29,000 litres of diesel from a 1.5 million litre tank had seeped into the floor beneath the storage tank.
Wessex Water reported that most of the diesel had reached its foul water storage drains, forcing the water company to breach the conditions of its discharge consent for a brief period.
Chevron had been advised by the Environment Agency on a number of occasions to replace sealant between the leaking tank and the bund but that there was no evidence that the work had ever been carried out.