During delivery at a soybean oil extraction unit, 4,000 to 5,000 litres of hexane were released into the retention tank of a storage facility and the sewer system following a leak and a handling error. Faced with the risk of explosion, the fire brigade and a mobile chemical intervention unit (C.M.I.C.) established a safety perimeter with a radius of 300 metres. The liquid was recovered, and the manifolds were ventilated.