Investigations are underway to determine the extent of a diesel leak at Christchurch's Horncastle arena.
Although the leak was fixed as soon as it was found, further investigations revealed fuel may have been leaking for years.
Vbase Acting General Manager Chris Mintern says more testing will be needed to ascertain the extent of the leak into the surrounding area.
The council has begun testing waterways nearby to determine whether diesel has leached into them.
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