APPENDIX A MAIN SITE INVESTIGATION Backfill to borehole BENTONITE grout Backfill to rotary boreholes/ installation GRAVEL Backfill to installation/ rotary borehole

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    APPENDIX A MAIN SITE INVESTIGATION REPORT

  • 01/12/2015

    Unit 12, Owenacurra Business Park, Midleton, Co. Cork T +353 21 4631600 F +353 21 4638690 E geotechnical@priority.ie

    Engineer: Tobin Consulting Engineers,

    Fairgreen House,

    Fairgreen Road,

    Galway,

    Ireland.

    Client: Irish Water,

    Colvill House,

    24-26 Talbot Street,

    Dublin 1

    Ireland.

    GLENAMADDY SEWERAGE SCHEME, CONTRACT NO.1

    SITE INVESTIGATION CONTRACT

    FACTUAL REPORT

    NO. P14100

    mailto:geotechnical@priority.ie

  • REPORT CONTROL SHEET

    Employer Irish Water

    Employers Representative

    Tobin Consulting Engineers

    Project Name Glenamaddy Sewerage Scheme, Contract 1 Site Investigation

    Report Name

    Glenamaddy Sewerage Scheme, Contract 1 - Site Investigation Contract Factual Report

    Project Number P14100

    This Report Comprises of

    RCS TOC Text No. of

    Appendices Drawings

    Electronic data

    1 1 20 4 4 *.pdf

    Revision Status Author(s) Approved By Issue Date

    D01 Draft JMH GH 13.03.2015

    F01 Final

    01.12.2015

  • P14100_RP_F01 i 01/12/2015

    TABLE OF CONTENTS

    1 INTRODUCTION .........................................................................................................................2

    1.1 SCOPE OF WORKS ...................................................................................................................2

    1.2 REPORTING.............................................................................................................................3

    1.3 SITE LOCATION & DESCRIPTION .................................................................................................4

    1.4 PUBLISHED GEOLOGY ..............................................................................................................4

    1.4.1 Solid ..............................................................................................................................4

    1.4.2 Superficial deposits ........................................................................................................4

    2 FIELDWORK ...............................................................................................................................5

    2.1 GENERAL ................................................................................................................................5

    2.2 EXPLORATORY HOLES ..............................................................................................................6

    2.3 SAMPLING ...............................................................................................................................7

    2.4 GROUNDWATER MONITORING ...................................................................................................8

    2.5 IN SITU TESTING ......................................................................................................................9

    3 LABORATORY TESTING ......................................................................................................... 13

    3.1 SOIL ..................................................................................................................................... 13

    3.2 ROCK ................................................................................................................................. 14

    3.3 SURFACE WATER ............................................................................................................. 14

    4 GROUND CONDITIONS ............................................................................................................ 16

    4.1 SUPERFICIAL DEPOSITS .......................................................................................................... 16

    4.2 BEDROCK DEPOSITS .............................................................................................................. 17

    4.3 GROUNDWATER ..................................................................................................................... 18

    5 SUMMARY ................................................................................................................................ 20

    APPENDICES

    APPENDIX A EXPLORATORY HOLE AND PHOTOGRAPHIC RECORDS

    APPENDIX B LABORATORY RESULTS

    APPENDIX C ARCHAEOLOGICAL MONITORING REPORT

    APPENDIX D EXPLORATION LOCATION PLANS

  • P14100_RP_F01 2 01/12/2015

    1 INTRODUCTION

    1.1 SCOPE OF WORKS

    In May 2014, Tobin Consulting Engineers (Tobin) acting as the Employers Representative

    and on behalf of their Client, Galway County Council commissioned Priority Geotechnical

    (PGL), to carry out a site investigation contract at the locations of proposed works for

    Glenamaddy Sewerage Scheme.

    The purpose of the investigation is to provide design information for the provision of sewer

    network (Creggs Road, Kilkerrin Road and Rising Main to WwTP) pumping stations (Main

    Street and Kilkerrin Road), wastewater treatment plant and an integrated constructed

    wetland system. The scope of the ground investigation, which was specified by Tobin, as

    Tendered comprised the following:

    19 No. trial pits excavations to a depth 1.5m;

    15 No. slit trenches excavations to a depth 1.5m;

    41 No. cable percussive to a depth 3.0m;

    16 No. rotary boreholes to a depth 10.0m;

    All associated sampling and In situ testing of soil and groundwater;

    Surface water sampling and testing of streams in the area;

    Laboratory testing of soil and rock;

    Preparation and presentation of detailed factual reports and drawings as per IS EN

    1997 (Eurocode 7) the specification and the Scope the Works and

    Reinstatement of all exploratory holes.

    The final works as completed are detailed in Section 3.2 of this factual report.

    This investigation was carried out in accordance with the contract specification: Specification

    and Related Documents for Ground Investigation in Ireland (Engineers Ireland, October

    2006), Eurocode 7- Geotechnical Design Part 2, ground investigation and testing (BS EN

    1997-2: 2007) and the relevant British Standards (BS 5930:1999 +A2:2010 and BS 1377,

    Parts 1 to 9). The fieldworks were carried out between 20th October and 04th February, 2014.

    Additional trial pitting and one rotary borehole were subsequently scheduled. The additional

    fieldworks were undertaken between the 5th and 6th October, 2015.

  • P14100_RP_F01 3 01/12/2015

    1.2 REPORTING

    This geotechnical data report (ref: P14100_RP_F01) presents the factual records of the

    fieldwork with respect to the site investigation works contract for the proposed Glenamaddy

    Sewerage Scheme.

    An archaeological report titled Glenamaddy Sewerage Scheme, Co. Galway, Archaeological

    Monitoring of Site Investigations was prepared by Dominic Delaney and Associates which

    details the archaeological monitoring undertaken during the direct investigations fieldworks.

    This report is presented in APPENDIX C of this factual report.

    No responsibility can be held by PGL for ground conditions between exploratory locations. The

    exploratory logs provide for ground profiles and configuration of strata relevant to the investigation

    depths achieved during the fieldworks. Caution shall be taken when extrapolating between such

    exploratory locations. No liability is accepted for ground conditions extraneous to the exploratory

    locations.

    No account has been taken of potential subsidence or ground movement due to mineral extraction,

    mining works or karstification below or in proximity to the site, unless specifically addressed.

    This report has been prepared for Ervia, Irish Water and TOBIN. The information should not be used

    without their prior written permission. PGL accepts no responsibility or liability for this document being

    used other than for the purposes for which it was intended.

  • P14100_RP_F01 4 01/12/2015

    1.3 SITE LOCATION & DESCRIPTION

    The site consists of work for the investigation of proposed sewer networks and pumping

    stations being mainly on public roads and some in urban residential environments. The

    works relating to the site investigation for the waste water treatment plant and the integrated

    constructed wetland system are mainly on agricultural land.

    1.4 PUBLISHED GEOLOGY

    1.4.1 Solid

    The Geological Survey of Ireland, 1:100,000 mapping (Sheets) were reviewed and the solid

    geology was Visean Limestone (VIS) and is described as undifferentiated Limestones. To the

    northwest of the proposed wastewater treatment plant and integrated constructed wetland

    system the bedrock is the Ballysteen Formation (BA) described as dark muddy Limestone

    and Shale. The two geological formations VIS/ BA are delineated by a fault feature and so

    bedrock in the area is expected to be variable. A search of the GSI karst data base identified

    numerous features; swallow holes, turloughs and enclosed depressions in the area.