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

47

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.