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Deeside Power Station Restoration Scheme

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Deeside Power Station Restoration Scheme Site Reference Client Name Revised Replacement Restoration Scheme Submitted pursuant to a Prior Notification of Proposed Demolition Works Decision Notice 058481 Dated 10th July 2018 at Deeside Power Station Deeside Power Station for: Deeside Power (UK) Ltd CRM.343.002.RS.R.001.C Deeside Power Station – Revised Restoration Scheme Contact Details: Enzygo Ltd. tel: 0114 321 5151 Samuel House fax:01454269760 5 Fox Valley Way email: steve. [email protected] Sheffield web:www.enzygo.com South Yorkshire S36 2AA Revised Replacement Restoration Scheme Deeside Power Station Project: Deeside Power Station For: Deeside Power (UK) Ltd Status: FINAL Date: December 2020 Author: Lee Searles Reviewer: Kevin Parr, Director Disclaimer: This report has been produced by Enzygo Limited within the terms of the contract with the client and taking account of the resources devoted to it by agreement with the client. We disclaim any responsibility to the client and others in respect of any matters outside the scope of the above. This report is confidential to the client and we accept no responsibility of whatsoever nature to third parties to whom this report, or any part thereof, is made known. Any such party relies on the report at their own risk. Enzygo Limited Registered in England No. 6525159 Registered Office Gresham House, 5-7 St. Pauls Street, Leeds, England, LS1 2JG Contents 1.0 INTRODUCTION ...................................................................................................... 3 1.1. Introduction ....................................................................................................... 3 2.0 SITE HISTORY .......................................................................................................... 5 2.1. Summary Table .................................................................................................. 5 3.0 RESTORATION SCHEME.......................................................................................... 8 3.1. General ............................................................................................................. 8 3.2. Dismantling plant and equipment ........................................................................ 8 3.3. Demolition ......................................................................................................... 8 3.4. Removal of underground services ......................................................................... 9 3.5. Treatment of piled foundations ............................................................................ 9 3.6. Backfilling ........................................................................................................ 10 3.7. Fencing ........................................................................................................... 10 3.8. Levels .............................................................................................................. 10 3.9. Noise and Dust Mitigation ................................................................................. 10 3.10. Timescales ....................................................................................................... 10 4.0 DRAWINGS ........................................................................................................... 12 CRM.343.002.RS.R.001.C Page 2 December 2020 1.0 INTRODUCTION 1.1. Introduction 1.1.1. Enzygo Limited (Enzygo) has been commissioned by Deeside Power (UK) Ltd to prepare a revised replacement Restoration Scheme and associated revised restoration plan for land at Deeside Power Station, Deeside, Flintshire. 1.1.2. Deeside Power has recently won a tender with National Grid to provide grid support services under their stability pathfinder programme. This will result in parts of the Deeside Power Station being retained and continuing in operation in connection with this contract. 1.1.3. As a result this revised restoration scheme is submitted in replacement of the existing approved Restoration Scheme reference CRM.343.001.RS.R.001.A under the approved Application for Prior Notification of Proposed Demolition reference number 058481 dated 10th July 2018. 1.1.4. Deeside has recently won a tender to provide synchronous compensation to the National Grid to support the grid system and as a result this replacement revised restoration plan is submitted in support of the amended restoration scheme and identifies the elements of plant, equipment and buildings to be retained as part of the ongoing operation of Deeside Power Station and replaces the approved restoration plan drawing CRM.343.001.RS.D.003. 1.1.5. The revised replacement restoration plan is shown on drawing CRM.343.002.PL.D.003.B. 1.1.6. For clarification the decommissioning, dismantling, remediation and restoration of the non- retained plant, equipment, and buildings within the Deeside Power Station site will be undertaken fully in accordance with the approved decision notice 058481 dated 10th July2018. 1.2. The Site 1.2.1. The power station is located within Deeside Industrial Park. It has an area of approximately 12.85 hectares. Infrastructure within the site boundary consists of two gas turbines, one steam turbine, two heat recovery steam generators (HRSG), a 400kV banking compound, a water treatment plant, a cooling tower system, a water intake station, associated offices, car parking areas and workshop. 1.2.2. The installation is situated on a generally level plot sloping downwards towards the western boundary of the site. A separate secure parcel in the north is occupied by National Grid plant. The site is fully enclosed with security fencing. 1.3. The Station 1.3.1. Deeside Power Station is a 510 megawatt (MW) gas-fired generating station. 1.3.2. The station was constructed in 1992 (commissioned in 1994) to supply electrical power to the National Grid. The station ceased permanent operation in March 2018. 1.3.3. The station was consented in 1990 under section 36 of the Electricity Act 1989 (section 36 consent) and the Town and County Planning Act 1990 (section 90). The site was extended in 1993 through Section 36 of the Electricity Act 1989. A copy of the relevant consents is provided within Appendix 1 of this report. 1.4. Purpose of this Document 1.4.1. The Restoration scheme has been prepared to ensure that at the cessation of the non-retained elements of the consented Power Station Use (generation ceased upon 31st March 2018) that those non-operational areas and associated buildings at the site will be demolished and CRM.343.002.RS.R.001.C Page 3 December 2020 restored to a condition satisfactory to Flintshire County Council (the Council). The proposed restoration works shall be undertaken in accordance with the submitted scheme. The Deeside Power Station ceased power generation on 31st March 2018. 1.4.2. Deeside Power has recently won a tender with National Grid to provide grid support services under their stability pathfinder programme. This will result in parts of the Deeside Power Station being retained in connection with this contract. The elements of the power station to be retained are identified coloured green on the attached revised restoration plan CRM.343.002.RS.D.003.B. 1.4.3. The equipment and infrastructure to be retained are the two gas turbines and associated generators, step up transformers and banking compound. The gas turbine rotors will be debladed and mass added back to the rotor to bring back the inertia lost by deblading. The identified internal access roads will also be retained along with the fire water tank and fire water pump. 1.4.4. The buildings to be retained consist of the gas turbine building, steam turbine building, HRSG building (stacks to be removed), electrical and admin building, transformer and service yard and gate house (as shown coloured green on drawing number CRM.343.002.RS.D.003.B. 1.4.5. The existing national grid gas compound and associated infrastructure will be retained along with all the other non-identified plant, equipment and buildings. The remaining identified buildings and infrastructure will be cleared and remediated fully in accordance with the approved documents and drawings submitted and approved under decision notice 058481 dated 10th July 2018. 1.4.6. The primary purpose of this revised Restoration Scheme is to ensure that those parts of the site that will become non-operational land will not become derelict, following the decommissioning and removal of the non-retained plant, equipment and buildings as identified on drawing CRM.343.002.PL.D.003.B. CRM.343.002.RS.R.001.C Page 4 December 2020 2.0 SITE HISTORY 2.1. Summary Table The following table summarises the history of the site, from c1874. Mapping details are included in the Enzygo Geo-Environmental Appraisal report, cited above. Map/Imagery Date On Site Surrounding Area (within 250m) A majority of the area surrounding the site also The site was an undeveloped area of sand consisted of sand and mud banks. There was a 1874 (1:2,500) and mud on the bank of the River Dee. north-south embankment adjacent the western site boundary. Some areas of march in the surrounding area. 1882 (1:10,560) No significant changes. Embankment marked as the high-water mark of ordinary tides. A quay is noted 69m south of the site. The marshy areas labelled as ‘liable to flooding’. A number of gaps are marked in the embankment. The River 1900 (1:10,560) No significant changes. Dee is marked as being located 730m south-west of the site. The high-water mark for ordinary tides have moved to cover the majority of the The areas
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