Site owner and industrial waste disposal contractor Ingrebourne Valley began work in 1998 and is finishing off by capping and covering the area with soil.
Manager of the 74 hectare site, the Forestry Commission, plans to open the park in Spring 2008. It has also invited the local community to join the debate about how to develop the recreational site, which will link with Hornchurch country park.
Ingrebourne Valley general manager David Parrack said: Originally the site was never capped, it was an eyesore and attracted antisocial behaviour.
This is the first time, to my knowledge, that the Forestry Commission has worked in partnership with a private company on this kind of project. It is a unique site of importance to the local area as the Igrebourne river, which is a Site of Special Scientific Interest, goes up one side of it.
We are also working to use recycled materials for the paths and anywhere else it may be appropriate.
The Forestry Commission is holding events near the site to promote its future use, which includes a public consultation and an open day on May 27 and May 30. The final design for the scheme will be unveiled at the end of July.