A plan for a major oil spill exercise due to be held in the Coromandel has been updated to take into account lessons learned during the Rena disaster.
The Waikato Regional Council exercise – involving up to 30 staff and including supporting agencies – will trial the use of booms to check their effectiveness in helping keep oil out of environmentally sensitive Coromandel sites.
Booms were used during the Rena oil spill.
The exercise has now been reduced to two days instead of three and the council has confirmed it will not be using sawdust to simulate oil floating on top of the sea.
The exercise is due to start at Whangamata harbour on June 12 and may also include the Otahu estuary and Opoutere harbour, depending on progress with the booming trials.
Regional on scene commander Adam Munro says the council’s annual marine spill exercise is normally held over a day at one location and is designed to deal with the effects of a spill inside a harbour.
“This year, following on from the Rena disaster, we’re expanding the exercise to several and up to three locations with a view to helping keep oil from a big spill out of the two harbours and the estuary.
“This will simulate a situation where oil is threatening multiple locations over an extended period, a scenario similar to which affected the Bay of Plenty after the Rena grounding.”
During the Rena grounding, the council and Maritime New Zealand developed a series of site specific response plans when it was predicted that oil from the Rena would impact the Coromandel’s east coast.
The narrow entrances to some Coromandel harbour and estuary areas meant there may be a good chance of using booms to help block them off from spills out to sea, says Adam.
However, these narrow entrances also created a number of challenges, including fast flowing tidal currents and limited access points.
“Because of potential impacts to these important and vulnerable environments every effort should be made to redirect and recover oil before it enters the upper areas of harbours and estuaries, thereby minimizing environmental damage and recovery cost.
“Should a big spill again threaten our region we want to see if our planning, tactics and Maritime NZ’s equipment that we use is up to the task of protecting these environments using blocking booms to keep out as much oil as possible.”
Adam says the exercise – which may involve limited restrictions on boats using the trial areas – will take into account the recommendations of a post-Rena Maritime NZ report on the use of booms to protect Whangamata, Otahu and Opoutere.
He noted that in the event of a big spill it may not be possible to protect every threatened site using booms and sites would have to be prioritised accordingly.
“This exercise will be a good opportunity to work with supporting agencies and to judge whether our current equipment is adequate for a range of scenarios.
“If we think more or different equipment is needed, we’ll make recommendations on this to Maritime NZ.”