COUNCIL officials are still calculating the full potential cost of developing the former Exxon site at Bowling.
As part of the regular update on the proposed City Deal project, last week's full West Dunbartonshire Council meeting heard bridge work would be needed costing more than £1million and unanswered questions about the state of the quay walls.
A report to councillors also noted designs for accessing the site "are now resolved and are more complex than the original concepts" and more information is available about alleviating flood risk.
Jim McAloon, head of regeneration and economic development, said there would be a "seven-figure figure" to raise platforms.
He added that if the originally planned bridge from Renfrew to Clydebank didn't go forward, the money could potentially be up for other local authorities to bid for.
The original outline business case for the Bowling development was written four years ago and a new one will now be prepared.
The final business case is due in December 2019.
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