Release of 340 kbm of Diesel over several days. Due to the low temperatures and the product released, the spill did not reach the sea.Uncontrolled release of 340 M3 diesel. Contaminated ground on site. Corrosion in a deadleg caused the leakage. The root cause of the incident was an accumulation of changes which started in back in 2003. In this and the coming years small scale alterations and adjustments to the plant led to the formation of deadlegs within an environment with risk of accumulation of water. Not enough concideration was given to winterization requirements. A contributing factor to the incident was that the two failed valves were made out of cast iron. In 2003 and theerafter, changes made to the process system were not effectively managed through the MOC-process. Out-of-use equipment was not removed.  The importance of:

    hazard and operability studies and other risk evaluations  after several minor changes
    management of change processes
    removal of old equipment
    use of correct materials in Equipment (cast iron valves were identified and replaced throughout the plant in 2010, but they failed to identify the valves that caused this accident)