Ellington Minewater Treatment Facility Geo-Environmental Desk Study Report the Coal Authority
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Ellington Minewater Treatment Facility Geo-environmental Desk Study Report The Coal Authority March 2012 Ellington Minewater Treatment Facility Geo-environmental Desk Study Report Notice This document and its contents have been prepared and are intended solely for The Coal Authority’s information and use in relation to informing the Client of potential geo-environmental site abnormals and constraints for the proposed redevelopment into a minewater treatment facility. Atkins assumes no responsibility to any other party in respect of or arising out of or in connection with this document and/or its contents. Document history Job number: 5100028 Document ref: Geo-environmental Desk Study Report Revision Purpose description Originated Checked Reviewed Authorised Date Rev 1.0 Draft for Client Comment MJT TA CS JPB Jan-12 Rev 2.0 Final MJT TA CS JPB Mar-12 Client signoff Client The Coal Authority Project Ellington Minewater Treatment Facility Document title Geo-environmental Desk Study Report Job no. 5100028 Copy no. Document Geo-environmental Desk Study Report reference Atkins Geo-environmental Desk Study Report | Version 2.0 | March 2012 Ellington Minewater Treatment Facility Geo-environmental Desk Study Report Table of contents Chapter Pages Executive summary i 1. Introduction 1 1.1. General 1 1.2. Background 1 1.3. Project References 1 1.4. Information Reviewed 2 1.5. Limitations 2 2. Site Area 3 2.1. Site Location 3 2.2. Site Description 3 2.3. Surrounding Area 3 2.4. Historical Land Use 4 2.5. Previous Ground Investigations 5 3. Geo-environmental Setting 6 3.1. Solid and Drift Geology 6 3.2. Mineral Exploitation 6 3.3. Ground Stability Hazards 6 3.4. Radon 7 3.5. Hydrology 7 3.6. Hydrogeology 8 4. Environmental Issues 9 4.1. Waste 9 4.2. Integrated Pollution Prevention Controls / Pollution Prevention Controls 10 4.3. Contemporary Trade Directory 10 4.4. Fuel Stations 10 4.5. Sensitive Land Use 10 4.6. Planning Hazardous Substance Consents 10 4.7. Other Environmental Information 10 5. Preliminary Conceptual Site Model 11 5.1. General 11 5.2. Sources 11 5.3. Pathways 11 5.4. Receptors 12 5.5. Contamination 14 5.6. Soil Borne Gas 14 5.7. Groundwater 14 6. Recommendations 15 7. References 16 Appendices 17 Appendix A. Drawings and Figures Appendix B. Envirocheck Report Appendix C. Historical Maps Atkins Geo-environmental Desk Study Report | Version 2.0 | March 2012 Ellington Minewater Treatment Facility Geo-environmental Desk Study Report Tables Table 1. Ground stability hazards within 500m of the site. 6 Table 2. Landfill / Waste Transfer Site Entries within 500m of the site 9 Table 3. Preliminary Conceptual Site Model Summary 12 Atkins Geo-environmental Desk Study Report | Version 2.0 | March 2012 Ellington Minewater Treatment Facility Geo-environmental Desk Study Report Executive summary Atkins Limited (Atkins) was commissioned by The Coal Authority to prepare a Geo-environmental Desk Study Report for the proposed Ellington Minewater Treatment Facility. Proposals for the treatment facility comprise settlement ponds, sludge drying beds, sludge handling area, a wetland feature and storage tanks. The site is located approximately 1.5km south-east of Lynemouth, Northumberland and 35km north of Newcastle-upon-Tyne. The site is irregular in shape and covers an area of approximately 23.6 hectares. The site lies on an area formerly occupied by Lynemouth Colliery, with the eastern section of the site covered by colliery spoil. A railway siding (formerly a mineral railway) used by an adjacent power station encroaches onto part of the site. A culvert passes beneath the railway siding and beneath hardstanding pavements on the north-east side. Ground levels across the site have a general fall from approximately 18m AOD in the north-west to 8m AOD in the south-east. The site is located immediately adjacent to the coastline with the boundaries defined by the River Lyne to the north, a power station to the south and Park Road to the west. The historical maps show the site evolving from agricultural pasture and undeveloped coastline in the 1860s with a section of the eastern part of the site lying below the high water line. Initial colliery expansion started in the 1920s which then occupied the site until the 1990s. Mining operations ceased in the early 1990s, leading to the decommissioning of buildings and infrastructure and pumping of groundwater from mineworkings ceased. Spoil heaps from the mine have changed the topography and coastline and make up the majority of the eastern section of the site. The historical plans show many springs, watercourses, drains and areas of sloped ground in the surrounding area. The course of the River Lyne changed several times due to the deposition of spoil heaps from flowing within the site historically, to defining the northern boundary in the present day. The surrounding area remained agricultural pasture and undeveloped coastline until the 1920s when residential and industrial development started in Lynemouth. The mineral railway ran through Lynemouth to the colliery and later extended to the adjacent industrial uses. The power station and an aluminium works were constructed by 1973 approximately 300m south-west and 250m east of the site, respectively. Lagoons associated with the aluminium works, sewage works and a travellers camp were all constructed in the area surrounding the site by the 1980s. The published geological mapping information shows the site is likely to be underlain by natural deposits of Glacial Till, overlying Middle Coal Measures. Two known shafts associated with the extraction of undersea coal reserves remain on-site and have depths of 220mbgl and 239mbgl. Based upon the available historical information, potential sources of contamination on-site are likely to be Made Ground (colliery spoil, demolition waste and landfill), leachable contaminants and soil borne gases. These sources include former colliery buildings, fuel tanks, mineral railway, colliery spoil, radiation store and minewater. Off-site potential contaminative issues include historical landfilling, mine tips, commercial/industrial sites and minewater discharge. These sources include the power station, sewage works, aluminium works and mine refuse tips on Lyne Sands. The construction of the proposed treatment facility within the site will allow removal of metal contamination prior to discharge into the River Lyne, thus removing the source and pathways. Atkins Geo-environmental Desk Study Report | Version 2.0 | March 2012 i Ellington Minewater Treatment Facility Geo-environmental Desk Study Report 1. Introduction 1.1. General Atkins Limited (Atkins) was commissioned by The Coal Authority to prepare a Geo-environmental Desk Study Report for the proposed Ellington Minewater Treatment Facility. A draft Concept Design Report was undertaken in April 2011 outlining the feasibility of a minewater treatment facility on the site (Ref. 1). This report is intended to support a planning application for the proposed development in accordance with PPS23 (Planning and Pollution Control) (Ref. 2) and CLR11 (Model Procedures for the Management of Contaminated Land) (Ref. 3). The options for the minewater treatment facility scheme are shown on Drawing No. 5034762/SBG/030/003-006 General Arrangement (Appendix A) and comprises settlement ponds, sludge drying beds, sludge handling area, a wetland feature and storage tanks. This report commences with a review of the site’s location and current condition together with the historical development of the site area based on Ordnance Survey Maps. It reviews and summarises readily available published geological, hydrological, hydrogeological and environmental information obtained by Atkins. It presents a Preliminary Conceptual Site Model (PCSM) identifying potential sources of contamination, pathways and receptors. Information presented within the initial Concept Design Report (Ref. 1) is included where appropriate. 1.2. Background The Coal Authority (CA) and the Environment Agency (EA) have a joint aim to enhance the environment by reducing pollution of controlled waters from existing minewater discharges and establishing preventative schemes to limit future contamination. Consequently The Coal Authority is directing significant resources to improving the quality of minewater discharges and reducing pollution of controlled water. The focus of this report is Ellington Combine which consists of the combined workings of Ellington Colliery and Lynemouth Colliery on undersea reserves in the northern part of the Northumberland Coalfield. Ellington Colliery was sunk between 1909 and 1913 and Lynemouth Colliery was sunk in 1927; both collieries worked the six seams in the area (Ashington, High Main, Main, Yard, Low Main and Brass Thill). A number of connections have been made between these collieries, principally at the Main Seam horizon. There are also direct connections between Ellington Colliery and Linton Colliery along with Lynemouth Colliery to Woodhorn Colliery. The Ellington and Lynemouth Collieries merged in 1983. In 1992 the pumping to protect Ellington Combine ceased and as a result the minewaters have continued to rise. Minewater monitoring has shown water levels to have continued to rise; however the rates of rise have reduced in recent years (Ref, 1). In December 2010 the minewater levels at Ellington were 86.42m BOD and 86.36m BOD at Lynemouth. 1.3. Project References A number of reports have been prepared for the site, the key documents referred to are listed below. This report should be