Once the project is completed, NHAI will return the site to the civic body.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/delhi-trash-ghazipur-landfill-site-will-now-be-used-make-highways
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/indian-express-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/delhi
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/landfill
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/municipal-corporation
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/national-highways-authority-india-nhai
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/waste-management
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/solid-waste