DISCO PA/2023/1118

Unless otherwise agreed by the local planning authority, development other than that required to be carried out as part of an approved scheme of remediation must not commence until parts 1 to 4 below have been complied with. If unexpected contamination is found after development has begun, development must be halted on that part of the site affected by the unexpected contamination to the extent specified by the Local Planning authority in writing until part 4 has been complied with in relation to that contamination.

Part 1: Site characteristics

A Phase 1 desk study shall be carried out to identify and evaluate all potential sources of contamination and the impacts on land and/or controlled waters, relevant to the site. The desk study shall establish a 'conceptual model' of the site and identify all plausible pollutant linkages. Furthermore, the assessment shall set objectives for intrusive site investigation works/Quantitative Risk Assessment (or state if none required). Two full copies of the desk study and a non-technical summary shall be submitted to the local planning authority for approval prior to proceeding to further site investigation.

An investigation and risk assessment, in addition to any assessment provided with the planning application, must be completed in accordance with a scheme to assess the nature and extent of any contamination on the site, whether or not it originates on the site. The contents of the scheme are subject to the approval in writing of the local planning authority. The investigation and risk assessment must be undertaken by competent persons and a written report of the findings must be produced. The written report is subject to the approval in writing of the local planning authority. The report of the findings must include:

(i) a survey of the extent, scale, and nature of contamination;

(ii) an assessment of the potential risks to:

- human health;

- property (existing or proposed), including buildings, crops, livestock, pets, woodland, and service lines and pipes;

- adjoining land;

- groundwaters and surface waters;

- ecological systems;

- archaeological sites and ancient monuments;

(iii) an appraisal of remedial options, and a proposal of the preferred option(s).

This must be conducted in accordance with Environment Agency's Land Contamination Risk Management (LCRM) guidance October 2020.

Part 2: Submission of remediation scheme

A detailed remediation scheme to bring the site to a condition suitable for the intended use by removing unacceptable risks to human health, buildings and other property and the natural and historical environment must be prepared and is subject to the approval in writing of the local planning authority. The scheme must include all works to be undertaken, proposed remediation objectives and remediation criteria, timetable of works and site management procedures. The scheme must ensure that the site will not qualify as contaminated land under Part 2A of the Environmental Protection Act 1990 in relation to the intended use of the land after remediation.

Part 3: Implementation of approved remediation scheme

The approved remediation scheme must be carried out in accordance with its terms prior to the commencement of development other than that required to carry out remediation, unless otherwise agreed in writing by the local planning authority. The local planning authority must be given two weeks' written notification of commencement of the remediation scheme works.

Following completion of measures identified in the approved remediation scheme, a verification report (referred to in PPS23 as a validation report) that demonstrates the effectiveness of the remediation carried out must be produced and is subject to the approval in writing of the local planning authority.

Part 4: Reporting of Unexpected Contamination

In the event that contamination is found at any time when carrying out the approved development that was not previously identified it must be reported in writing immediately to the local planning authority. An investigation and risk assessment must be undertaken in accordance with the requirements of Part 1, and where remediation is necessary a remediation scheme must be prepared in accordance with the requirements of Part 2, which is subject to the approval in writing of the local planning authority.

Following completion of measures identified in the approved remediation scheme a verification report must be prepared, which is subject to the approval in writing of the local planning authority in accordance with Part 3.

The details submitted in pursuance of the outline planning permission shall be accompanied or preceded by the submission to the planning authority of an archaeological mitigation strategy, to be defined in a written scheme of investigation (WSI). The strategy shall accord with a brief provided by North Lincolnshire Historic Environment Record and shall include details of the following:

(i) measures to ensure the identification and preservation by record of all structures and features associated with RAF Sandtoft within the site

(ii) methodologies for the recording of structural remains and the recording and recovery of archaeological remains, including artefacts and ecofacts

(iii) post-fieldwork methodologies for assessment and analyses

(iv) report content and arrangements for dissemination, and publication proposals

(v) archive preparation and deposition with recognised repositories, including the ADS

(vi) a timetable of works in relation to the proposed development, including sufficient notification and allowance of time to ensure that the site work is undertaken and completed in accordance with the strategy

(vii) monitoring arrangements, including the notification in writing to the North Lincolnshire Historic Environment Record of the commencement of archaeological works and the opportunity to monitor such works

(viii) a list of all staff involved in the implementation of the strategy, including sub-contractors and specialists, their responsibilities and qualifications.