One Sunday following a diesel leak on an internal pipe on the site, the internal emergency plan of a company operating hydrocarbon storage facilities was activated at 12 pm. The portion of pipe (coating with tar) where the leak was located, buried 1 m deep on waste ground, was operating at a pressure of between 4 and 5 bar. The leak had been discovered after a sheen was observed on one of the piers on the basin. An inspection of pipes in the sector revealed a small protrusion of a few cm above to the ground. It was accompanied with a puddle of 3 m in diameter. The feed pumps were stopped 5 minutes after the observation, and then the pipe was placed in water to flush the product towards the originating tank. The leak, through a finger-sized hole on the lower generator, was temporarily repaired using a wooden bung. A longer term repair was carried out a few days later by installing a “shell”. A mound of earth (10 cm) was formed to contain the product in the puddle and then the impregnated soil was removed. In order to prevent the slicks and sheens (150 m²) from spreading, 2 floating booms (2 times 250 m) were also used on the basin, as well as absorbent booms and a skimmer. The polluted water was pumped out. The volume drained in the basin was a few m³. The impregnated soils were recovered and treated. The internal emergency plan was lifted at 3 pm. The cause of the hole in the pipe was related to corrosion. Following the accident, 50 cm of soil were removed below the pipes so that they could be inspected.