The spill was simulated and a water probability of contamina-tion (surface and shoreline) was obtained; islands of Konebomby: 2–8%, island of Loos: 10–12%, coasts of Conakry: 4–6% and other volatile compounds total4.6%. The initial density and viscosity are respectively: 0.870g/cc at25 ◦C and 9.0 cSt at 25 ◦C. Thresholds of concern were1ppb of tot.