They have launched the search contractors to deliver the agreed plans to transform the parklands, infrastructure and those venues not covered by existing contracts for their long term use after the Games.

Once the ODA's legacy transformation is complete the Olympic Park will be handed over to the legacy owners, primarily the Olympic Park Legacy Company (OPLC) and Lee Valley Regional Park Authority.

ODA Director of Design and Regeneration Alison Nimmo said: "We are on track to complete the Olympic Park venues, infrastructure and parklands ready for London 2012 and are putting in place a team to transform them for their legacy use after the Games.

"Legacy was at the heart of the London 2012 bid and 75p of every pound spent cleaning-up what was a former industrial area and creating the Olympic Park is an investment in the regeneration of east London.

"The venues, sports facilities, parklands, allotments, roads, bridges, footpaths, cyclepaths, energy and utilities networks will form the foundation of the long-term development of this part of London for future generations."

The ODA is advertising two opportunities to deliver the Olympic Park legacy transformation, one for the south and north of the park, which include:

* Completing the 250 acre legacy parklands to create the largest urban public park created in the UK for over a century including wetlands, woods, meadows, heathland, lawns riverside gardens, frog ponds, 250 benches and seating throughout the Park.

* delivering the legacy cycling facilities in the Velopark including minor internal works to the Velodrome, creating a one mile closed road cycle circuit and 7km mountain bike track and modifying the Games time BMX track.

* creating four football fields (2.1 hectares) worth of allotments.

* delivering football fields on east Marsh.

* removing innovative temporary elements of Games-time bridges and concourses to create an intimate park well connected internally and with the local area.

* removing temporary security infrastructure, extending the parklands and completing 15km of cycle and foot paths and a road network connecting the Olympic Park with surrounding neighbourhoods.

* converting venues and other buildings for their legacy use including removing temporary external elements from the International Broadcast Centre and minor internal works to the Handball Arena and Velodrome. The legacy conversion of the Olympic Stadium, Olympic Village and Aquatics Centre are covered by existing contracts.

* removing temporary security infrastructure including the perimeter fence.