To get approval for any construction project, it is mandatory to have proper site disposal of the muck and debris, however the NHA has not created any dumping site.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/himachal-highway-dumping-raises-environmental-concerns
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/statesman-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/himachal-pradesh
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environmental-security
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/beas
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/national-highways-authority-india-nhai
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environment