Point sources such as landfills can release high concentrations of pollutant into the groundwater because of migration of leachate from its bottom, which is generated primarily as a result of precipitation falling on an active landfill surface, leaching out the potential organic and inorganic contaminants from landfilled waste and discharging the same to groundwater in underlying aquifer.
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/chloride-transport-landfills
[2] http://admin.indiaenvironmentportal.org.in/category/author/s-k-singh
[3] http://admin.indiaenvironmentportal.org.in/category/author/bharat-jhamnani
[4] http://admin.indiaenvironmentportal.org.in/category/journal/journal-institution-public-health-engineers
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-pollution
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/groundwater-pollution
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/landfill
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/research