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<p>The Appraisal of Sustainability, published alongside the proposed Airports National
Policy Statement, identifies the potential soil contamination issues in relation to
the Heathrow Northwest Runway scheme. The Airports Commission also included £123m,
plus optimism bias, for site levelling and soil remediation within its cost and commercial
assessment.</p><p> </p><p>The Government has been clear that expansion will be privately
financed and costs will not fall on the taxpayer. This includes any land decontamination
costs.</p><p> </p>
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