13.—(1) No part of the authorised development shall be carried out until details of a comprehensive contaminated land investigation has been submitted to and approved by the relevant planning authority and until the scope of works approved therein have been implemented.
(2) Unless otherwise approved by the relevant planning, the assessment shall include a site investigation to fully and effectively characterise the nature and extent of any land contamination and/or pollution of controlled waters, including a risk assessment that—
(a)adopts the Source-Pathway-Receptor principle and takes into account the sites existing status and proposed new use; and
(b)where the risk assessment identifies any unacceptable risk or risks, provides a detailed remediation strategy to deal with land contamination or pollution of controlled waters affecting the site and two full copies of the site investigation and findings shall be forwarded to the relevant planning authority.
(3) Where paragraph (2)(b) applies, no works, other than investigative works, shall be carried out on the site prior to receipt of written approval of the remediation strategy by the relevant planning authority, and remediation of the site shall be carried out in accordance with the approved remediation strategy unless otherwise approved by the relevant planning authority.
(4) No occupation of any part of the authorised development shall take place until two copies of a verification report (“Verification Report”) demonstrating completion of works set out in the approved written scheme and the effectiveness of the remediation shall be submitted to and approved by the relevant planning authority.
(5) The Verification Report shall include—
(a)results of sampling and monitoring carried out in accordance with the written scheme required under paragraph (1), to demonstrate that the site remediation criteria have been met;
(b)a plan (a “Long-term Monitoring and Maintenance Plan”) for longer-term monitoring of pollutant linkages, maintenance and arrangements for contingency action, as identified in the Verification Report, which shall be implemented as approved.
(6) If during development, contamination not previously considered is identified then the relevant planning authority shall be notified immediately and no further work shall be carried out until a method statement detailing a scheme for dealing with the suspect contamination has been submitted to and agreed with the relevant planning authority.