The firm, which won one of the original main civils package for the site, will remove temporary stadiums, including basketball and water polo, and double the amount of parkland.

It will also have the task of reconfiguring Games-time bridges and underpasses under a new “Clear, Connect, Complete” programme of work designed to link nearby communities to the park.

“The appointment of Bam Nuttall will help set the foundations for a fantastic Olympic Park post the London 2012 Games,” Olympics minister Hugh Robertson said in a statement.

Around 500 jobs will be created in the process with at least 20% going to local residents in the host London boroughs and with training and apprenticeship opportunities on offer.

The project will be funded from the £292m budget set aside from the £9.3bn Olympic purse. The park will reopen in phases from July 2013.

Bam faces a tight programme, which is as challenging as preparing for the Games themselves.

The Olympic Park Legacy Company is keen that the Queen Elizabeth Olympic Park is opened as soon as possible and has set Bam the task of completing the north section by the summer of 2013 and the southern part by spring 2014.

Mace is overseeing the work as project manager with Bam, operating under a £49m contract for the north of the park and £27m price for the south.

The OPLC is also preparing to invite contractors to prequalify to bid for the £95m partial dismantling and rebuild of the Olympic stadium.