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A5 Western Transport Corridor Geotechnical Preliminary Sources Study Report

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A5 Western Transport Corridor Geotechnical Preliminary Sources Study Report A5 Western Transport Corridor Section 3: South of Omagh to Aughnacloy Geotechnical Preliminary Sources Study Report (GW163) 796036/0600/R/007A 9th June 2009 Produced for DRD Roads Service (Western Division) Prepared by Marguerite Rea Geotechnical Engineer Mouchel Geotechnics Shorefield House 30 Kinnegar Drive Holywood County Down BT18 9JQ 028 9042 4117 028 9042 7039 [email protected] www.mouchel.com Disclaimer This report presents the findings of a Preliminary Sources Study that was undertaken to establish the geotechnical and geo-environmental constraints and potential risks associated with the proposed scheme. This report presents a review of the information obtained during the desk study in accordance with the guidelines that were issued by the Highways Agency (HA) in HD22/08“Managing Geotechnical Risk,” (implemented in Northern Ireland by Roads Service Standard RSPPG_E008). The objective of this report is to cover the geotechnical risks, investigation implications and feasibility of all scheme options. Mouchel has prepared this report on the basis of the available information received during the study period. Although every realistic effort has been made to obtain all relevant information, all potential contamination, environmental and / or geotechnical constraints or liabilities associated with the site may not necessarily have been revealed. Any interpretation and advice given in this report should be considered preliminary and suitable for planning purposes only. It should not be used for detailed design unless confirmed by a ground investigation. This report has been prepared and written for the exclusive benefit of the DRD Roads Service for the purpose of providing geotechnical and geo-environmental information relevant to the proposed scheme. The report contents should be only used in that context. Moreover, new information, changed practices or new legislation may necessitate revised interpretation of the report after the date of its submission. Note on BSEN14688 Soils and rocks in this document have been described in accordance with BSEN1468 and BSEN14689, in accordance with the implementation of Eurocode 7 in the UK with historic site investigation records complying to BS 5930 (1981) and British Standard CP2001 Site Investigations (1957). Format of Drawings To aid with the management of the large volume of information gathered and assessment of parameters, drawings referenced throughout this report can be viewed and interrogated electronically within the Arc Reader (GIS) File accompanying this report, on hard drive. Although the referenced drawings can be selected from the navigation pane the reader is however also encouraged to navigate freely around the GIS model and turn layers on and off at will to compare and contrast features. Arc Reader contains the geo-environmental information for the entire scheme. Arc Reader not only presents the information spatially but also provides additional supplementary information about the features shown, either by hovering over and/or clicking on the symbology for the particular geo-environmental feature. General advice on how to use Arc Reader is also contained within Appendix A 796036/0600/R/007A i June 2009 © Mouchel 2009 Contents 1 Introduction ....................................................................................................................... 1 1.1 Background ......................................................................................................................... 1 1.2 The Scheme........................................................................................................................ 1 1.3 Purpose of the Report ......................................................................................................... 6 1.4 Format of the Report ........................................................................................................... 7 2 Sources of Information and Desk Study......................................................................... 8 2.1 Sources of Information ........................................................................................................ 8 2.2 Previous Ground Investigations ........................................................................................ 11 3 Field Studies.................................................................................................................... 12 3.1 Drive through Survey ........................................................................................................ 12 3.2 Walkover Survey ............................................................................................................... 12 3.3 Quarry and Landfill Survey................................................................................................ 12 3.4 Peat Surveys..................................................................................................................... 13 3.5 Preferred Route Corridor Survey ...................................................................................... 13 3.6 Preliminary Ground Investigation...................................................................................... 13 3.7 Other Field Work ............................................................................................................... 15 4 Site Description............................................................................................................... 16 4.1 General.............................................................................................................................. 16 4.2 Geography & Topography................................................................................................. 18 4.3 Land Use ........................................................................................................................... 20 4.4 Historical Mapping............................................................................................................. 23 4.5 Aerial Photography............................................................................................................ 23 4.6 Geology............................................................................................................................. 25 4.7 Hydrogeology and Groundwater Vulnerability .................................................................. 32 4.8 Hydrology .......................................................................................................................... 33 4.9 Other Statutory Consultee Responses ............................................................................. 38 5 Ground Conditions ......................................................................................................... 43 5.1 Anticipated Soils................................................................................................................ 43 5.2 Made Ground .................................................................................................................... 45 5.3 Superficial Soils................................................................................................................. 46 5.4 Bedrock ............................................................................................................................. 55 5.5 Groundwater...................................................................................................................... 56 5.6 Contaminated Land........................................................................................................... 58 796036/0600/R/007A ii June 2009 © Mouchel 2009 6 Preliminary Engineering Assessment .......................................................................... 59 6.1 Superficial Soils................................................................................................................. 59 6.2 Cuttings ............................................................................................................................. 62 6.3 Embankments ................................................................................................................... 62 6.4 Subgrade........................................................................................................................... 63 6.5 Structure Foundations....................................................................................................... 63 6.6 Contaminated Land........................................................................................................... 64 6.7 Soil Chemistry ................................................................................................................... 65 6.8 Other Geotechnical/Man-Made Problems/Obstacles........................................................ 65 7 Comparison of Projects Options and Risks................................................................. 67 7.1 Statement of Preferred Route Options.............................................................................. 67 7.2 Initial Reduction to Preferred Route.................................................................................. 69 7.3 Establishment of Geotechnical Risk Register ................................................................... 74 7.4 Geotechnical Classification ............................................................................................... 75 7.5 Annex A............................................................................................................................
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