Four companies have been ordered to pay a record fine to the Auckland Regional Council over a fuel leak.
They are URS New Zealand, Brown Brothers, Gasoline Alley Services and another company Fuelquip, which had previously admitted its involvement.
They were convicted in the Auckland District Court for their roles in the leaking of 10,000 litres of fuel from a petrol station in 2007.
The spill in Glen Innes happened after a hole was accidentally drilled in a fuel line. Some of the fuel then spilled into Ruapatoka Stream nearby.
The companies have been fined $160,000 and told to pay costs of $80,000.
The regional council's principal enforcement adviser, Janet Whiteside, says a court order for further testing around the site will be finalised on Thursday and the companies could be ordered to pay more.
Ms Whiteside says the judge estimated any further remedial work could cost about $200,000.