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<p>In the Appraisal of Sustainability (AoS) that accompanies the proposed Airports
National Policy Statement (NPS), the Government has undertaken a high level assessment
of the effect on the water environment of the Heathrow Northwest Runway scheme.</p><p>
</p><p>The proposed Airports NPS sets out the requirements in relation to water quality
and resources which any applicant for a Development Consent Order would need to meet.
This potentially includes the effects on water bodies or protected areas under the
Water Framework Directive.</p><p> </p><p>The Government has not estimated the time
it will take to decontaminate land. This a matter that would need to be addressed
as part of any application for development consent. The AoS identifies a range of
sources and pathways for contamination within the site boundary. These include two
active landfills, 16 historic landfills and 11 registered pollution incidents, five
of which are classified as significant.</p><p><strong> </strong></p>
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