Almost $1 million has been spent dealing with asbestos in some of Rotorua's major projects and there may be more to come.
On Thursday a Rotorua Lakes Council spokeswoman confirmed the organisation had stumped up $951,000 to date on asbestos-related issues on the museum, the performing arts centre, the lakefront and Kuirau Park.
In April last year after asbestos was found in the roof of the museum, council arts and culture manager Stewart Brown told the Rotorua Daily Post the asbestos was not substantial and was expected to cost up to $40,000 to remove.
However, more asbestos had since been found and this week a council spokeswoman said $290,000 had been spent.
"Most of this has been on asbestos in the ground in the basement. Final costs won't be known until the foundations are dug and will depend on whether or not asbestos is discovered at different depths."
Asbestos-related costs associated with the demolition of the Scout Hall and the Soundshell on Rotorua's lakefront, and work at Kuirau Park were about $601,000, the spokeswoman said.
"The vast majority of this was related to the Soundshell - an estimated $553,000 related to asbestos, including removal and ground remediation, $288,000; asbestos assessment, monitoring and safety, $205,000; and project management, $60,000."
About $60,000 had been spent, mostly on sampling and testing, at the Sir Howard Morrison Performing Arts Centre.
Councillor Trevor Maxwell expressed his concern at a meeting of the council's operations and monitoring committee on Thursday about the discovery of asbestos in many council projects.
"In all the reports on the various projects we've got the thing that sticks out to me is always the asbestos, always holding us up or costing so much," he said.
Maxwell asked for a "ballpark figure" of how much it had cost the council.
Sport, recreation and environment manager Rob Pitkethley said asbestos was "an artefact of the era of the buildings that we're working on".
commonly used from a very long time ago, especially in a lot of the buildings now that we're working on, 50, 60 years old.
"It's a contingency that we've learned to put into our programmes to make sure that we are aware that it is likely to be found and so we manage it as best we can."
Arts and culture manager Stewart Brown told the meeting it had been a "process of discovery" and initial testing at the museum had found asbestos in the "upper layer".
"We removed that, and then as we've dug down, we've found it in lower levels.
"It's even more challenging because we need to ventilate the area in the basement. As we're removing the very fine silica particles down there, that fires the asbestos into the air, so we've got ongoing monitoring, cleaning, retesting and that process is still ongoing.
"I don't have a definitive time in terms of how long it will take, it will take as long as it takes to clean it. We do have an advantage that we have discovered this pre-construction so we're not standing down construction."
On Thursday, the council announced the Sir Howard Morrison Performing Arts Centre had reached "another key milestone" after the $17.44 million construction contract was awarded to Hawkins.
Construction is due to begin next week.