During the weekend, quenching oils spill on the floor in a factory manufacturing springs. Employees note on Monday morning that the tank drain valve is open, with a loose plug, in the storage enclosure for waste and liquid raw materials; Oils have infiltrated the soil. The accident was reported only 8 days later. It has no immediate consequences, but a deferred pollution of a drinking water catchment is feared, the plant being located in a remote protection perimeter. An act of vandalism is suspected. The facility must clean up the soil and reorganize the management and storage of its production waste (closed storage, shelter and retention).