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Baseline Report Series: 8 Baseline Report Series: 8. The Permo-Triassic Sandstones of Manchester and East Cheshire Groundwater Systems and Water Quality Commissioned Report CR/03/265C Science Group: Air, Land & Water Technical Report NC/99/74/8 The Natural Quality of Groundwater in England and Wales A joint programme of research by the British Geological Survey and the Environment Agency BRITISH GEOLOGICAL SURVEY Commissioned Report CR/03/265C ENVIRONMENT AGENCY Science Group: Air, Land & Water Technical Report NC/99/74/8 This report is the result of a study jointly funded by the British Geological Baseline Report Series: Survey’s National Groundwater Survey and the Environment Agency’s Science 8. The Permo-Triassic Sandstones of Group. No part of this work may be reproduced or transmitted in any form or Manchester and East Cheshire by any means, or stored in a retrieval system of any nature, without the prior permission of the copyright proprietors. All rights are reserved by the copyright K J Griffiths, P Shand and J Ingram proprietors. Disclaimer Contributors The officers, servants or agents of both the British Geological Survey and the Environment Agency accept no liability R Hargreaves (GIS), E Hough (geological cross- whatsoever for loss or damage arising sections), CJ Milne (databasing), A E Milodowski from the interpretation or use of the information, or reliance on the views (SEM) contained herein. Environment Agency Dissemination status Internal: Release to Regions External: Public Domain ISBN: 978-1-84432-633-4 Product code: SCHO0207BLYF-E-P ©Environment Agency, 2003 Statement of use This document forms one of a series of reports describing the baseline chemistry of selected reference aquifers in England and Wales. Cover illustration Sherwood Sandstone (Wilmslow Formation) outcrop, Alderley Edge. Key words Baseline, Sherwood Sandstone, Manchester, water quality, hydrogeochemistry, UK aquifer. Environment Agency Project Manager: Bibliographic Reference Griffiths, KJ, Shand, P and Ingram J, Dr Rob Ward/ Jonathan Smith 2003 Baseline Report Series: 8. The Science Group: Air, Land & Water Permo-Triassic Sandstones of Manchester and East Cheshire British Geological Survey Project Manager: British Geological Survey Commissioned Report No. CR/03/265C Dr Paul Shand Groundwater Systems & Water Quality Programme ©Environment Agency 2003 ©NERC 2003 Environment Agency Science Group, Solihull 2003 British Geological Survey, Keyworth, Nottingham 2003 BRITISH GEOLOGICAL SURVEY ENVIRONMENT AGENCY The full range of Survey publications is available from BGS The Environment Agency is the leading public body protecting Sales Desk at the Survey headquarters, Keyworth, Nottingham. and improving the environment in England and Wales. The more popular maps and books may be purchased from BGS-approved stockists and agents and over the counter at the It's our job to make sure that air, land and water are looked after by Bookshop, Gallert 37, Natural History Museum, (Earth everyone in today’s society, so that tomorrow’s generations inherit Galleries), Cromwell Road, London. Sales. Sales Desks are a cleaner, healthier world. also located at the BGS London Information Office, and at Murchison House, Edinburgh. The London Information Office Our work includes tackling flooding and pollution incidents, reducing maintains a reference collection of the BGS publications industry’s impacts on the environment, cleaning up rivers, coastal including maps for consultation. Some BGS books and reports waters and contaminated land, and improving wildlife habitats. may also be obtained from the Stationery Office Publications Centre or from the Stationery Office bookshops and agents. 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Kingfisher House, Goldhay Way, Orton Goldhay, Peterborough PE2 5ZR Keyworth, Nottingham NG12 5GG Tel 01733 371811 Fax 01733 231840 0115 936 3100 Telex 378173 BGSKEY G Fax 0115 936 3200 Midlands e-mail: [email protected] www.bgs.ac.uk Sapphire East, 550 Streetsbrook Road, Solihull, West Midlands B91 1QT Murchison House, West Mains Road, Edinburgh, EH9 3LA Tel 0121 711 2324 Fax 0121 711 5824 0131 667 1000 Telex 727343 SEISED G Fax 0131 668 2683 North East Rivers House, 21 Park Square South, Leeds LS1 2QG London Information Office at the Natural History Museum, Tel 0113 244 0191 Fax 0113 246 1889 Earth Galleries, Exhibition Road, South Kensington, London, SW7 2DE North West 0207 589 4090 Fax 0207 584 8270 Richard Fairclough House, Knutsford Road, Warrington WA4 1HG 0207 938 9056/57 Tel 01925 653999 Fax 01925 415961 St Just, 30 Pennsylvania Road, Exeter EX4 6BX South West 01392 278312 Fax 01392 437505 Manley House, Kestrel Way, Exeter EX2 7LQ Tel 01392 444000 Fax 01392 444238 Geological Survey of Northern Ireland, 20 College Gardens, Belfast BT9 6BS Southern 01232 666595 Fax 01232 662835 Guildbourne House, Chatsworth Rd, Worthing, Sussex BN11 1LD Tel 01903 832000 Fax 01903 821832 Maclean Building, Crowmarsh Gifford, Wallingford, Oxfordshire OX10 8BB Thames 01491 838800 Fax 01491 692345 Kings Meadow House, Kings Meadow Road, Reading RG1 8DQ email: [email protected] Tel 0118 953 5000 Fax 0118 950 0388 Parent Body Environment Agency Wales Natural Environment Research Council 29 Newport Road, Cardiff CF24 0TP Polaris House, North Star Avenue, Swindon, Wiltshire Tel 01222 770088 Fax 01222 798555 SN2 1EU 01793 411500 Telex 444293 ENVRE G Fax 01793 411501 Contents 1. EXECUTIVE SUMMARY 1 2. PERSPECTIVE 2 3. BACKGROUND TO UNDERSTANDING BASELINE QUALITY 5 3.1 Introduction 5 3.2 Geology 5 3.3 Hydrogeology 13 3.4 Aquifer mineralogy 16 3.5 Rainfall chemistry 18 3.6 Landuse in the area 18 4. DATA AND INTERPRETATION 20 4.1 Project sampling programme 20 4.2 Historical data 21 4.3 Interpretation of pumped groundwater samples 21 4.3.1 Different borehole designs 21 4.3.2 Differences in stratigraphy 21 4.3.3 Differences in pumping history 21 4.4 Data handling 22 5. HYDROCHEMICAL CHARACTERISTICS 23 5.1 Introduction 23 5.2 Water types and physicochemical characteristics 26 5.3 Major elements 26 5.4 Minor and trace elements 28 5.5 Pollution indicators 30 6. GEOCHEMICAL CONTROLS AND REGIONAL CHARACTERISTICS 31 6.1 Introduction 31 6.2 Depth variations 31 6.3 Temporal variations 31 6.4 Age of the groundwater 37 6.5 Spatial variations 37 6.5.1 Mineral dissolution reactions 38 6.5.2 Redox reactions 40 6.5.3 Ion exchange reactions 42 6.5.4 Mixing with older formation water 43 6.5.5 Trace elements 45 7. BASELINE CHEMISTRY OF THE AQUIFER 46 8. SUMMARY AND CONCLUSIONS 48 9. REFERENCES 49 i List of Figures Figure 2.1 Topographic and drainage map of the Manchester and East Cheshire Study area. Red lines indicate the outline of the Permo-Triassic Sandstone outcrop. ............................3 Figure 2.2. Industrial land use is widespread throughout the study area. The photograph was taken in the north of the study area [NGR SD 849 029] at a site where groundwater is abstracted for cooling in the manufacturing process. ...................................................4 Figure 3.1 Geological map of the Manchester and East Cheshire study area. The position of lines of section A and B (Figures 3.2 and 3.3) are marked. ..................................................6 Figure 3.2 Section A: west-east geological cross-section from NGR SJ 795 804 to NGR SJ 959 837 illustrating structural complexity of the sandstone aquifer (after British Geological Survey 1:50 000 Geological Map 98 (Solid) Stockport)............................7 Figure 3.3 Section B: geological cross sections (north-south) through the study area for (a) solid geology and (b) drift (vertical scale is exaggerated to show the complexity of the drift sequence). Line of section shown on Figure 3.1...........................................................8 Figure 3.4 Fractured Wilmslow Sandstone outcrop at Alderley Edge [NGR SJ 8640 7808]. .....10 Figure 3.5 View to the north east from Alderley Edge [NGR SJ 8608 7766] where the Sherwood Sandstone crops out. ...................................................................................................10 Figure 3.6 Conglomerate within the Helsby Sandstone at Alderley Edge. ..................................11 Figure 3.7 Drift geology of the Manchester and East Cheshire Study area. Red line and shading indicate the Permo-Triassic Sandstone aquifer outcrop area. .....................................12 Figure 3.8 Groundwater flow contours and direction of regional groundwater flow (based on groundwater contours produced by ESI, 2001) ..........................................................15 Figure 3.9
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