A number of Shoalhaven trucking companies and suppliers held a peaceful protest on Monday morning when six trucks parked on Braidwood Road near the site.

During the protest another major contractor agreed to remove their workers from the site in support, if the money is not paid.

The drivers in the protest were among at least 30 contractors owed money after Canberra-based civil engineering company, Hewatt's Earthmoving, was placed into administration last week.

Sub contractors’ spokesman Mark Nelson, from Co-ordinated Logistics said Monday’s protest could be stepped up and could potentially close down the worksite unless workers receive owed payments of between $3 million and $5 million.

“My company alone is owed $350,000 and I know of at least 30 contractors who are owed money,” he said.

“Something has to be done. Local sub contractors can’t carry this kind of debt.”

While Mr Nelson said it is hoped the dispute can be quickly resolved, further action including a blockade of the site was not out of the question.

“It could bring the whole site to a standstill,” he said.