In an oil and chemical product warehouse, a series of valves were disassembled on the supply line of a drum-filling station that was being demolished; certain components of this station were also used to supply the adjacent truck-loading station. At the time a vehicle was being loaded, 7144 litres of ethanol escaped from the drum-filling station and flowed into the facility’s sewer system. Onsite operators decided to let the product evaporate, and the emergency plan was not activated. No people were injured during the accident and there is no evidence of significant ecological harms. An operator error and inadequate operating procedures are the cause of the accident.