Yesterday government officials proudly showed off the Illinois River sediment that has been arriving from East Peoria to serve as topsoil for a south lakefront park. The river mud was deposited at the old U.S. Steel South Works site, near East 87th street. The plan is for the Mud-to-Parks project to turn the former industrial site into a fertile park. About 105,000 tons of sediment will be placed on top of the slag field to create new parklands.