The offer by Cr Vandervis was emailed late yesterday afternoon, a day after he was told to apologise for bullying, aggressive and misleading behaviour or be stripped of committee voting rights for two months.
Cr Vandervis had vowed not to recognise the council resolution, but partially backtracked in an email sent to Mayor Dave Cull, councillors, council staff and media at 4.22pm yesterday.
In it, he said he ''unreservedly'' acknowledged his ''loudness behaviour'' towards council chief executive Sue Bidrose and audit and risk subcommittee chairwoman Susie Johnstone was ''wrong, unacceptable and in breach of the code of conduct''.
''I am genuinely remorseful that I upset people with my loudness and that my initial apology was insufficient. I undertake to do my utmost to ensure that I do not repeat such behaviour.''
He was also prepared to ''unreservedly apologise'' for misleading the audit and risk subcommittee over comments he made claiming the scope of a police investigation into the Citifleet fraud was too narrow.
However, he would only do so if hard evidence was made available showing the Citifleet investigation had been widened.
As evidence, he would accept an unredacted copy of Deloitte's full Citifleet investigation, evidential files and other documents, which were yet to be released while the police investigation continued.
The reports could be provided on a ''strictly confidential basis'', and he offered to sign a confidentiality affidavit agreeing not to release them until after the police investigation was complete.
Mr Cull said when contacted Cr Vandervis' apology did not appear to comply with Tuesday's council resolution, but that was to be decided by Dr Bidrose or her delegate.
Dr Bidrose is overseas, but council group chief financial officer Grant McKenzie, acting for her, emailed Cr Vandervis last night to rule the apology for loudness was accepted.
However, the apology relating to misleading statements was not accepted, as it was ''contingent on being provided with further evidence'', Mr McKenzie said.
There was also no acknowledgement from Cr Vandervis his behaviour - in misleading the subcommittee - was wrong, unacceptable and in breach of the code of conduct, and there was no commitment not to repeat the behaviour, Mr McKenzie said.
Cr Vandervis' request for the full Deloitte report and other documents had also been previously considered, and declined, and the grounds for doing so remained, he said.
''While your email goes someway to meeting the requirements of the resolution, it does not adequately cover the audit and risk subcommittee matter.''
The council's resolution on Tuesday, which was passed 11-3, called for Cr Vandervis to offer a ''genuine'' apology for his behaviour within 24 hours, or face censure and the loss of his committee voting rights for two months.
The apology was to acknowledge his behaviour was ''unacceptable'' and had to include a ''genuine expression of remorse''.
It was also not to be ''contingent on others' reaction to his behaviour'', or contain ''any attempt to downplay or explain his actions'', the resolution read.
Mr Cull said he was pleased Cr Vandervis had responded, but it was conditional and downplayed his altercations with staff.
''He's apologising for his loudness. Well, it was more than loudness. That was shown,'' Mr Cull said.
Mr McKenzie's email noted the 24 hour deadline, set on Tuesday afternoon, but gave Cr Vandervis more time ''if you wish to resubmit your email in light of my comments''.
