The leakage of approximately 33 m3 of diesel fuel.
During pumping diesel fuel into the storage tank  the storage tank was overfilled.
Diesel fuel flowed into the retaining reservoir and then into the neighborhood around the tank.
Diesel fuel was leaking from the overfilled tank through the fire equipment, the pipeline for extinguishing foam first, later sprayed under pressure from leaking under the flange for a radar to measure the level in the storage tank.
FRS immediately initiate the necessary security measures of the leak and started decontamination work.
Diesel fuel flowed into the neighborhood around the tank.
The cause of the overflow tank was clearly failure to comply the prescribed operating procedures for the filling of diesel fuel.
Safety documentation and work instructions describe in detail the steps the bottling process.
The tank was equipped with signalling of fulfilment. But it was not equipped with an automatically locking the dispensing pump when the tank will be overfilled. Overfill alarm was functional and the signal was passed to the control room, but it was not recorded. The control room is not a part of the bottling space on the siding and does not have the permanent staff.
Operator should follow and comply with the prescribed operating procedures for the filling of diesel fuel. Furthermore, automatic shut down system must be in place to lock the dispensing pump when the tank can be subject to be overfilled. In case the alarm is functional, a procedure must be in place how to comply with it in case of an emergency and should be recorded. Given that the control room was not a part of the bottling space on the siding and did not have the permanent staff, so it is imperative to have training for temporary staff as well as written procedures in the control room available.