In an oil depot, a leak occurred on a fuel pipe at a barricade passage between a sub-basin and the loading pump unit. After detecting the anomaly early afternoon, fuel loading was interrupted and the corresponding pipes were isolated. The leaked hydrocarbon spilled into the sealed area of the pump unit connected to a settling tank. This was then sealed to collect the fuel oil (undetermined but in principle a small amount). The operator cleared the pipes the next day to identify the source of the leak, neutralise it and make the necessary repairs as quickly as possible. The replacement pipe and neighbouring pipes were protected from corrosion using “elastomer” strips. Work involved cutting the concrete wall initially providing the retention volume, and a temporary barricade was built made up of sand bags, consolidated at the base using shotcrete and sealed using a waterproof membrane. The new construction of the barricades was built using concrete formwork filled with fine sand, with an upper flagstone containing inspection hatches used for checking the pipes, and the pipe penetrations in the concrete walls sealed using a 4-hour fire-resistant joint. Approximately 5 t of soil constituting the barricade, contaminated with hydrocarbon, was stored in a sealed retention area and then treated by thermal desorption by a specialist company.