Section 2, South of Strabane to South of Omagh Ground Investigation Report – Volume 1 Introduction and General Principles August 2010 Document Ref No 718736-0600-R-007 Volume 1 of 10 For Department for Regional Development Roads Service Ref GW163 Belfast Shorefield House 30 Kinnegar Drive Holywood County Down Northern Ireland BT18 9JQ T 028 90424117 F 028 90427039 A5 WTC - Section 2 Ground Investigation Report - Volume 1 Introduction Job_Name4and General Principles Document Control Sheet Project Title A5 Western Transport Corridor Report Title Section 2 - Ground Investigation Report - Volume 1 Introduction and General Principles Report Reference 718736-0600-R-007 Vol 1 of 10 Version A Issue Date August 2010 Record of Issue Version Status Author & Date Checked & Date Authorised & Date A For R O’Hagan 08/10 A Wheeler 02/09/10 D Towell comment C McDermott 08/10 P Brown 08/10 J Kelly 08/10 Distribution Organisation Contact Format Copies DRD Roads Service Western C Loughrey – Project Pdf 1 Division Sponsor DRD Roads Service HQ W Kerr – Engineering Pdf 1 Policy Unit Jacobs Engineering UK Limited Lee Davison Pdf 1 (on behalf of RS HQ) Mouchel Derek Parody Project Pdf 1 Manager © Mouchel 2010 ii 718736-0600-R-007 Vol 1 of 10 - August 2010 A5 WTC - Section 2 Ground Investigation Report - Volume 1 Introduction Job_Name4and General Principles © Mouchel 2010 iii 718736-0600-R-007 Vol 1 of 10 - August 2010 A5 WTC - Section 2 Ground Investigation Report - Volume 1 Introduction Job_Name4and General Principles Table 1-1 Geotechnical Reports – List of Volumes GIR Report Number Title Start End Volume CH CH 1 718736-0600-R-007 Introduction and General 27000 57600 Vol 1 of 10 Principles 2 718736-0600-R-007 Findings of the Investigation, 27000 33000 Vol 2 of 10 Section 2A 3 718736-0600-R-007 Findings of the Investigation, 33000 41100 Vol 3 of 10 Section 2B 4 718736-0600-R-007 Findings of the Investigation, 41100 44500 Vol 4 of 10 Section 2C 5 718736-0600-R-007 Findings of the Investigation, 44500 48000 Vol 5 of 10 Section 2D 6 718736-0600-R-007 Findings of the Investigation, 48000 49800 Vol 6 of 10 Section 2E 7 718736-0600-R-007 Findings of the Investigation, 49800 51200 Vol 7 of 10 Section 2F 8 718736-0600-R-007 Findings of the Investigation, 51200 57600 Vol 8 of 10 Section 2G 9 718736-0600-R-007 Environmental Testing Vol 9 of 10 Analysis 10 718736-0600-R-007 Risk Register Vol 10 of 10 This Volume is the Volume highlighted in Bold © Mouchel 2010 iv 718736-0600-R-007 Vol 1 of 10 - August 2010 A5 WTC - Section 2 Ground Investigation Report - Volume 1 Introduction Job_Name4and General Principles LIMITATIONS This report is presented to the Roads Service in respect of A5 Western Transport Corridor (WTC) - Section 2 and may not be used or relied on by any other person or by the client in relation to any other matters not covered specifically by the scope of this Report. Notwithstanding anything to the contrary contained in the report, Mouchel Limited is obliged to exercise reasonable skill, care and diligence in the performance of the services required by the Roads Service and Mouchel Limited shall not be liable except to the extent that it has failed to exercise reasonable skill, care and diligence, and this report shall be read and construed accordingly. This report has been prepared by Mouchel Limited. No individual is personally liable in connection with the preparation of this report. By receiving this report and acting on it, the client or any other person accepts that no individual is personally liable whether in contract, tort, for breach of statutory duty or otherwise. Mouchel has used reasonable skill, care and diligence in the design and interpretation of the ground investigation, however, the inherent variability of ground conditions allows only definition of the actual conditions at the location and depths of exploratory holes and samples/tests therefrom, while at intermediate locations conditions can only be inferred. New information, changed practices or new legislation may necessitate revised interpretation of the report after the date of its submission © Mouchel 2010 v 718736-0600-R-007 Vol 1 of 10 - August 2010 A5 WTC - Section 2 Ground Investigation Report - Volume 1 Introduction Job_Name4and General Principles Contents 1 Executive Summary......................................................................................... 10 2 Introduction...................................................................................................... 12 2.1 Description of the Project.......................................................................... 12 2.2 Scope and Objective of the Report ........................................................... 18 2.3 Geotechnical Category of Project ............................................................. 20 2.4 Other Relevant Information....................................................................... 21 3 Existing Information........................................................................................ 22 3.1 Sources of Information.............................................................................. 22 3.2 Previous Ground Investigations ................................................................ 25 4 Field and Laboratory Studies.......................................................................... 26 4.1 Walkover Survey ...................................................................................... 26 4.2 Geomorphological/Geological Mapping .................................................... 26 4.3 Ground Investigation ................................................................................ 26 4.4 Drainage Studies...................................................................................... 31 4.5 Geophysical Survey.................................................................................. 32 4.6 Pile Tests.................................................................................................. 32 4.7 Other Field Work ...................................................................................... 32 4.8 Laboratory Investigation ........................................................................... 32 5 Ground Summary ............................................................................................ 36 5.1 Geography................................................................................................ 36 5.2 Topography .............................................................................................. 37 5.3 Historical Development............................................................................. 37 5.4 Man-made Features – Mining and Quarrying............................................ 39 5.5 Hydrology ................................................................................................. 39 5.6 Geology.................................................................................................... 40 5.7 Hydrogeology ........................................................................................... 48 5.8 Geomorphology........................................................................................ 50 6 Ground Conditions and Material Properties.................................................. 51 6.1 Introduction............................................................................................... 51 7 Geotechnical Risk............................................................................................ 76 8 Basic Design Philosophy and Methodology.................................................. 77 8.1 Introduction............................................................................................... 77 8.2 Earthworks ............................................................................................... 78 8.3 Highway Structures .................................................................................. 94 8.4 Strengthened Earthworks ......................................................................... 95 8.5 Drainage................................................................................................... 95 8.6 Pavement Design, Subgrade and Capping............................................... 96 8.7 Contaminated Land .................................................................................. 98 8.8 Ground Treatment Including Treatment of any Underground Voids etc. ... 98 8.9 Specification Appendices.......................................................................... 98 8.10 Instrumentation and Monitoring ................................................................ 98 Principal Symbols ................................................................................................ 99 References.......................................................................................................... 102 © Mouchel 2010 vi 718736-0600-R-007 Vol 1 of 10 - August 2010 A5 WTC - Section 2 Ground Investigation Report - Volume 1 Introduction Job_Name4and General Principles Tables Table 1-1 Geotechnical Reports – List of Volumes..............................................iv Table 2-1: Section Limits......................................................................................14 Table 2-2: Parties to the Project...........................................................................17 Table 2-3: Report Volumes...................................................................................18 Table 3-1: Sources of Information .......................................................................22