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PA 21/01000/B WPN Department of Infrastructure Supplementary Statement
In March 2023 the DEFA approved, and subsequently published, its ‘Waste Regulation Policy for Isle of Man Landfill’ in March 2023 (the Policy) (Appendix 1). This is a non-statutory policy document that post-dates submission of PA21/01000/B. This DEFA Policy has not therefore been referenced in the documents associated with this planning application.
The development proposed has been reviewed against the DEFA Policy. This assessment has identified no conflict between the development proposed and the DEFA Policy. PA21/01000/B requests permission to continue landfill operations until 31st December 2030. The DEFA’s Policy’s principal objective for existing landfill is to ‘Phase out 'dilute and disperse' landfill by 31st December 2030’.
Section 2.3 of the Environmental Impact Assessment Report December 2021, ‘Background to the Proposed Development’ summarises the timeline of landfill operations at WPN. The most recent PA permitting site landfilling operations was PA12/01671/B. This PA expired on 31 December 2019. In advance of this date the Department had sought political approval to submit a planning application to extend the duration of site operation. This approval was not forthcoming in the timescale required to ensure the operation of the site remained compliant. This has required the submission of an, in part, retrospective planning application covering the period 1 January 2020 to the present day.
Over the past five years the Department has continued to plan for the development of a fully engineered Strategic Waste Landfill Facility (SWLF) as a replacement for WPN. This SWLF will be an engineered site designed to meet the UK standards for a non-inert landfill site. One of the main parameters impacting site design is the types and tonnage of wastes forecast to be deposited at the site. This information is pending. The Department and the waste sector have been considering methods for treating some problematic/hazardous wastes, for example hydrocarbon contaminated soils and Asphalt Waste Containing Coal Tar (AWCCT), to facilitate the reuse of the aggregate and soils, rather than disposing of them to landfill. In accordance with the waste hierarchy if these waste can be reused it reduces the need for contained landfill void space, and may impact SWLF site design.
In February 2023 the DOI delivered 4,052 tonnes of soil/stones to WPN for use as daily cover material. This material is stockpiled at the western section of Cell 2 over unexcavated sand. The material is comprised of sediments dredged from a number of rivers and waterways as part of DOI’s flood defence and harbours statutory duties. It had been in temporary storage at a licensed site since 2015 pending identification of a final route for its management.
In November 2022, following interpretation of samples analysis data, the DEFA issued an End of Waste determination for the dredged sediment, advising ‘we would have no objection for this material to being deposited at Wrights Pit North as final restoration cover if considered suitable.’ Its use as cover material at WPN was confirmed by DEFA in December 2022. The DOI determined to remove the material from its temporary storage site as soon as practicable, and before the official start of the Bird Nesting season (1 March 2023).
Project Nr: 562 Project Name: Wright’s Pit North Landfill Note made by: Steve Challinor, ADBP Date and Time: 15/05/2023 Client Contact: Jeremy Reece, DOI Organisation: Department of Infrastructure,
Isle of Man
Subject: Wright’s Pit North Landfill Remaining Void Space This note has been prepared to update the position regarding the remaining void space at Wright’s Pit North (WPN) landfill.
The DOI has undertaken three topographical surveys of WPN since 2020. These surveys were used to calculate the void space remaining at WPN based on a final landform that complies with the site restoration scheme approved under PA12/01671/B. Table 1 identifies the estimated void space remaining at WPN by volume (in m3) and by equivalent weight in construction and demolition (C&D) waste and/or cover material (in tonnes). A conversion factor has been used that equates 1m3 of void space with 1.5 tonnes of C&D waste and/or cover material.
| Survey Date | Estimated Remaining Void Space (m3) | Estimated Remaining Void Space (tonnes)<br><br> |
|---|---|---|
| May 2020 | 14,400 | 21,600 |
| August 2021 | 13,160 | 19,740 |
| April 2023 | 7,700 | 11,550 |
The waste quantities disposed of at WPN vary annually. Since the start of 2014 (which corresponds to the start of waste deposition approved under PA12/01671/B), the waste quantities deposited at WPN (in tonnes per annum; tpa) range from 566tpa to 2,182tpa, and indicate an average annual waste deposition demand of approximately 1,157tpa. The average annual waste demand is skewed by a oneoff deposit of 1,451 tonnes C&D waste from a DOI project which elevated the waste quantities deposited at WPN in 2019. Tables 2 and 3 identify the annual waste demands at WPN with and without the aforementioned one-off deposit in 2019 respectively. Assuming that the average annual waste demand shown in Table 3 is the best indicator of future annual waste demand, then the future annual waste demand at WPN is predicted to be approximately 995tpa.
| 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | Average |
|---|---|---|---|---|---|---|---|---|---|
| 2,251.3 | 1,206.2 | 1,045.1 | 571.5 | 705.1 | 2,182.4 | 918.5 | 565.9 | 963.4 | c.1,157 |
| 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | Average |
|---|---|---|---|---|---|---|---|---|---|
| 2,251.3 | 1,206.2 | 1,045.1 | 571.5 | 705.1 | 731.4 | 918.5 | 565.9 | 963.4 | c.995 |
A 3:1 cover to waste ratio is applied at WPN. Accordingly, an average annual waste demand of 995tpa will have an average annual cover requirement of 2,985tpa, which will result in a combined placement of 3,980tpa at WPN and the use of 2,650m3 per annum of the remaining void space. On this basis, the estimated lifetime for the remaining void space at WPN is 2.9 years.
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