Senior CFA managers say they can't remember how much money they have spent defending the Fiskville fire training facility from contamination claims.
The executives also told an inquiry they weren't aware of possible contamination at the site before whistleblower and former CFA chief officer Brian Potter went to the media in late 2011.
Three former CFA senior executives were called to give evidence on Thursday at the Victorian parliamentary inquiry into the firefighting training college in Fiskville.
The centre was closed in March 2015 after the discovery of a cancer cluster among those who had lived, worked and trained there.
Claire Higgins was chairperson of the CFA board between 2012 and 2015 and helped the board oversee its budget and allocation of government funding.
But Ms Higgins was unable to recall on Thursday how much money the board had approved for the reports and studies commissioned by the CFA as part of its investigation into Fiskville.
"How much money was spent by the CFA in commissioning these reports?" committee chair and Labor MP Bronwyn Halfpenny asked.
"How much has been spent on the legal costs defending the CFA?"
Ms Higgins said: "I don't know ...I don't recall those numbers."
Michael Wooten, the CFA's senior finance manager, also couldn't give a ballpark figure on the amount of funds spent.
"It seems surprising there wouldn't have been some sort of report that says 'hey, this is how much has been spent'," said Ms Halfpenny.
Since public hearings began in May, the inquiry has heard CFA management were aware there was contaminated sludge in one of its Fiskville dams and had commissioned their own tests for PFOS, a toxic chemical used in firefighting foam.
Euan Ferguson, who was the CFA's chief officer for five years before stepping down in November, on Thursday told the inquiry he had not heard any concerns, rumours or whispers about Fiskville before they were reported by the media.
The inquiry's final report is due in March.
A special report delivered in November said the CFA was refusing to hand over documents and extensively redacting what it did disclose.
The report also said the CFA was claiming documents no longer existed.
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