Appendix II The Proposed Leannan Crossing Open Cut Methodology

EcIA - Ecological Impact Assessment (EcIA) August 2020 County Donegal Towns & Villages Sewerage Schemes. Ramelton – Milford – Rathmullan (RMR) Sewerage Scheme

215

Appendix II – The Proposed Leannan Crossing Open Cut

Methodology

Ramelton, Milford and Rathmullan Sewerage

Scheme

Ramelton Estuary Crossing

OPEN CUT METHODOLOGY

April 2020

Jennings O’Donovan & Partners Ltd. Consulting Engineers,

Finisklin Business Park, Sligo.

Tel.: 071 9161416

Fax: 071 9161080 email: [email protected]

mailto:[email protected]

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IRELAND.

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DOCUMENT APPROVAL

PROJECT

Ramelton, Milford and Rathmullan Sewerage Scheme

CLIENT / JOB NO

Irish Water 4940

DOCUMENT TITLE Ramelton Estuary Crossing Open Cut Methodology

Prepared by Reviewed/Approved by

This document, and information or advice which it contains, is provided by JENNINGS O’DONOVAN & PARTNERS LIMITED solely for internal use and reliance by its Client in performance of JENNINGS O’DONOVAN & PARTNERS LIMITED’s duties and liabilities under its contract with the Cl ient. Any advice, opinions, or recommendations within this document should be read and relied upon only in the context of the document as a whole. The advice and opinions in this document are based upon the information made available to JENNINGS O’DONOVAN & PARTNERS LIMITED at the date of this document and on current standards, codes, technology and construction practices as at the date of this document. Following final delivery of this document to the Client, JENNINGS O’DONOVAN & PARTNERS LIMITED will have no further obligations or duty to advise the Client on any matters, including development affecting the information or advice provided in this document. This document has been prepared by JENNINGS O’DONOVAN & PARTNERS LIMITED in their professional capacity as Consulting Engineers. The contents of the document does not, in any way, purport to include any manner of legal advice or opinion. This document is prepared in accordance with the terms and conditions of JENNINGS O’DONOVAN & PARTNERS LIMITED contract with the Client. Regard should be had to those terms and conditions when considering and/or placing any reliance on this document. Should the Client wish to release this document to a Third Party for that party's reliance, JENNINGS O’DONOVAN & PARTNERS LIMITED may, at its discretion, agree to such release provided that: (a) JENNINGS O’DONOVAN & PARTNERS LIMITED written agreement is obtained prior to such release, and

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Document

Rev 2

Name Name

Date

6th April 2020

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Document

Rev 3

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Jennings O’Donovan Consulting Engineers Sligo _________________________________________________________________________________________________

_________________________________________________________________________________________________ 4940-CN4-RMR-Esturary Open Cut Trench Methodology i April 2020


Open Cut Methodology

Ramelton Estuary Crossing

Table of Contents

1 INTRODUCTION 2

2 ESTUARY CROSSING 2

3 SITE PREPARATION & MOBILISATION 3

4 WORKS PROCEDURE 3

5 EXCAVATION 4

6 PIPE INSTALLATION & BACKFILLING 5

7 CONTROLLING SPILLS 5

8 HORIZONTAL DIRECTIONAL DRILLING 6

9 TIMING/DURATION 8

APPENDIX 1 - PLAN AND LONGITUDINAL SECTION OF THE RISING MAIN CROSSING

APPENDIX 2 - ROCK PROFILE

APPENDIX 3 - SITE INVESTIGATIONS

APPENDIX 3 - TYPICAL PHOTOGRAPHS OF OPEN CUT MARINE WORKS


_________________________________________________________________________________________________ 4940-CN4-RMR-Esturary Open Cut Trench Methodology April 2020


Open Cut Methodology Estuary Crossing at Ramelton

1 INTRODUCTION

The Ramelton estuary crossing involves the construction of a 200mm OD HPPE PE 100 SDR 11

rising main under the Leannan Estuary which is a designated SAC and SPA. The overall length

of the crossing is approximately 200m. There is a combination of both sandy gravels and rock in

the channel bed. A drawing showing the plan and longitudinal section of the crossing is attached

as Appendix 1. A sketch of the rock profile is attached as Appendix 2 and the site investigations

along the crossing is attached as Appendix 3. This report relates to the methodology for the open

cut of the estuary between approximately Ch 0m and Ch 200m to lay the proposed rising main.

The proposed works will be conducted following any associated mitigation provided within the

Ecological Impact Assessment (EcIA) (Woodrow, 2020a), Natura Impact Statement (Woodrow,

2020b) and MERC 2020 reports that have been produced to support this methodology. Such as

the need for appropriate Ecological Clerk of Works (ECoW) supervision, Seasonal Constraints,

Pollution Controls, Biosecurity Measures and Monitoring of the Works.

2 ESTUARY CROSSING

It is proposed to use open cut methodology for the estuary from Ch 0m to Ch 160m and

horizontal directional drilling methodology (HDD) for the northern embankment from Ch 160m

to Ch 200m along the proposed rising main route. The ground level of the northern

embankment rises steeply from Ch 160m and it is considered a safer construction approach

to use HDD through the incline for the short section from Ch 160m to Ch 200m. The geology

of the ground/seabed along the proposed pipeline route consists of a mixture of gravelly sandy

silt and bedrock. The rock rises to within 500mm of the estuary/riverbed at approximately the

midpoint of the proposed route of the estuary crossing. Therefore, the open cut excavation

will have to pass through the gravelly sandy silt and bedrock. The rock profile across the

estuary can be seen in Appendix 2. Approximately 25-30m3 of rock will need to be excavated

to create the proposed trench for the rising main.

Open cut methodology for installing the rising main from Ch 0m to Ch 160m is covered in Sections

3 – 7 of this report. This will be achieved by a conventional open cut and cover trenching using



an excavator dig system. HDD methodology for installing the rising main from Ch 160m to Ch

200m is covered in Sections 8 of this report.

3 SITE PREPARATION & MOBILISATION

It is proposed that the open cut trench works of the estuary crossing takes place prior to the

commencing the proposed Ramelton Main Pumping Station (MPS) works to allow enough space

for the secure storage of the equipment. A list of the potential equipment required is listed below:

(i) 20t 360° Excavator

(ii) Ravenstien floating pontoon

(iii) Heavy timber wear boards for deck of barge

(iv) Work service boat

(v) Mini tug

(vi) Dive Spread

(vii) 40 KVA generator

(viii) Welder

(ix) Fuel bowser

(x) Works container

(xi) Small plant items

4 WORKS PROCEDURE

The purposed works will be completed in the following stages:

(i) Mobilisation and access/egress to the works

(ii) Excavation of the trench on the side of the Ramelton MPS to the estuary, Ch 0-

10m.

(iii) Access to the working area will be from the Quayside of the river only.

(iv) Excavation of the trench in estuary of low tide. Barge to rest on estuary/riverbed.

(v) Excavation of the trench in the middle of the estuary in wet area to be completed

from floating barge.

(vi) Pipe to be jointed/welded and pressure tested on onshore. The jointed length of

pipe will be floated out in 1 section for the open cut

(vii) Pipe ballasting

(viii) Pipe installation

(ix) Pipe testing

(x) Backfilling of excavation



5 EXCAVATION

Following a review of the proposed works, the foreshore and the intertidal area, it is proposed that

the excavation will be completed using a 20 tonne 360° excavator. The 360° excavator will be

mounted and working from a pontoon barge approximately 12m x 10m in size. The position,

alignment and depth of the trench will be confirmed by the use of Trimble 3D GPS which will be

mounted on the excavator.

The side slopes of the trench will be constructed to ensure that the trench remains stable for the

duration of the excavation, pipe laying and backfilling. It is proposed that no backfilling or profiling

of the trench will be carried out until the entire rising main has been installed in the trench.

All spoil from the excavation will be side cast and deposited to one side of the trench and will be

positioned within reach of the excavator for the backfilling. The position of the spoil will be mapped

using the Trimble 3D GPS.

The barge will have all necessary equipment on board including spill kits and pollution control

measures. A silt curtain will be placed around the entire works to mitigate against any silt created

by excavation works. The silt curtains are made from impermeable fabric material, curtains are

installed along the side of the barge to keep sediment contained to a central area. This allows

sediment to fully settle onto the bed of the estuary. Monitoring buoys will be installed adjacent to

the works to monitor turbidity and other parameters during excavation works. The trench will be

excavated to the correct levels using the 20-tonne standard reach digger as the water level and

trench level are within the scope of a standard excavator arm.

During the construction of the open cut trench across the estuary it will be necessary to break

rock from approximately Ch 35m to Ch 75m. The rock profile across the estuary can be seen in

Appendix 2. It is proposed that a three-tonne rock breaker fitted to the 20-tonne excavator on the

pontoon will be used for this operation. Once the rock has been broken a ripper tooth will be used

to loosen rock within the trench. The rock will then be excavated and side cast or transported to

the nearby pier in Ramelton. The volume of rock excavation is approximately 25-30m3.

Depending on the size of the rock excavated it may be unsuitable for backfilling the trench.

Unsuitable excavated rock will be transported to the nearby pier in Ramelton via a transport barge.

Imported clean stone will be used to replace the unsuitable excavated rock tobackfill the pipe

trench if there is not enough quality material on site. Imported stone will be certified and pre-

washed prior to arrival on site and will be transported to the trench via the transport barge.



6 PIPE INSTALLATION & BACKFILLING

It is proposed that the entire length of the open cut trench will be excavated prior to laying any

pipe. Following excavation of the trench, the full length of welded pipe will be floated out and

positioned in the trench using the excavator. The ballast weights will be connected to the section,

either on the foreshore or in the trench, depending on the ease of which the pipe section can be

manoeuvred. Ballast weights will be connected to the pipe at the specified intervals of

approximately 3.5m apart.

It is proposed that the excavated material would be used to back fill the trench. Ballast weight

collars will be fitted to the rising main pipe to anchor it in position and prevent floatation. Four

bolts will be used to connect the two sections of the collar and will be tightened manually to ensure

that the concrete collar is tight on the outfall pipe and that cracking does not occur around any of

the holes.

At the designated position for the concrete collar, the rising main will be wrapped with a strip of

foam/neoprene rubber to provide additional grip for the collar and minimise slippage on the pipe.

In areas of high flows or wave action scour mitigation measures such as scour bags/rockbags will

be installed if it is required. Rockbags are an environmentally friendly method of providing scour

projection to the rising main. They are made of 99% recycled polyester (PET), the rockbags are

filled with aggregate making it a very flexible solution for marine construction work. The rockbags

are available in 3 sizes (2, 4 & 8 tonne) and feature a one-point lifting ring for fast and accurate

installation. The units are a proven solution for preventing erosion or scour caused by

hydrodynamic forces.

7 CONTROLLING SPILLS

Hydraulic systems on all marine equipment employed on the project will use biodegradable fluids

to minimize pollution in the case of oil leaks, especially hydraulic hose failures. All equipment will

be carefully checked on a daily basis by the Site Supervisor prior to use within the estuary to

ensure plant and machinery is in good working order with no leaks or potential for spillages. In

order to minimise any risk of pollution in the first instance. An appropriate hydrocarbon boom will

be available on the site in the event of any unforeseen hydrocarbon spillages and all staff shall

be trained in their use.

http://www.insidersecretstohydraulics.com/hydraulic-oil-leaks.html

http://www.insidersecretstohydraulics.com/hydraulic-hose.html



Drip trays and spill kits plant nappies shall be available on site. Drip trays are to be placed under

all stationary plant including pumps and generators. Any spillages will be cleaned up and reported

to the Project Manager immediately. Spill kits will be available in all large items of plant powered

by fuel and will be required to be used in the event of a spillage. An appropriately sized

hydrocarbon boom shall be available on the site in the event of a larger spillage. All staff shall be

appropriately trained in their use. All machinery and equipment shall be carefully checked on a

daily basis to ensure that there are no leakages, spillages or other issues to ensure equipment

and machinery is in good working order.

All dispensing or transferring of fuel will be attended for the duration of the operation. The

attendant will be aware of proper fuel handling procedures to minimize the risk of a spill and shall

continuously scan the area adjacent to the fuelling operation for possible leaks or spills. The

transferring and dispensing of fuel will be done with pumping equipment, an approved hose, and

top-fill nozzle. Spilkleen oil and fuel pads will be readily available on site to selectively absorb oils

and fuels in the case of a spill while working in the estuary.

A designated wash down area within the proposed Ramelton pumping station site will be used

for cleaning of any equipment or plant, with the safe disposal of any contaminated water. No

washing out of equipment shall take place into any watercourse in the Leannan esturary.

The following biosecurity equipment will be provided:

• Gloves;

• Virkon Aquatic disinfectant;

• High power spray bottle;

• Scrubbing brushes;

• Plastic bucket to use as a footbath.

8 HORIZONTAL DIRECTIONAL DRILLING

Due to the steep incline of the northern bank of the estuary between the foreshore and the

adjacent field the rising main will be horizontally directionally drilled between Ch 160m and Ch

200m. The ground profile can be seen an attached in Appendix 1, Dwg. No

4940/CN4/RMR/SD/124. Open cut is not recommended to avoid destabilising the steep bank.



Two pits are required – a launch pit and a receiver pit. In this case a launch pit would be

excavated in the field by an excavator on the northern side of the estuary at Ch 200m.

Approximate dimensions for the excavation would be 6m long x 3m wide x 2m deep. It is expected

that the excavation would be carried out in stiff grey slightly gravelly sandy SILT. Sides of the

drive pit will be battered with no requirement for sheet piling. The receiver pit would be located on

the foreshore of the estuary on the north western side at approximately Ch 160m. The reception

pit will be approximately 3m x 3m x 1.5m deep. The reception pit will be excavated by the 20-

tonne excavator positioned on the pontoon barge. As was the case with the launch pit, sides of

the excavation can be battered with no requirement for sheet piling. The reception pit will be

aligned with the open cut trench method to allow for a continuous and smooth alignment of the

rising main. Access for the HDD plant and personnel will be via the R-247 and wayleave as per

Dwg. No 4940/CN4/RMR/101.

The Drilling Rig will be mobilised to the works area and positioned at ground level beside the

launch pit on a hard surface only. The recycling unit, pumps and generators shall be set up and

connected to the drilling rig. Settlement Tank Unit will be mobilised adjacent to the launch pit at

Ch 200m and outside of the SAC to control the discharge of the suspended solids/silt from any

pumped water (i.e. groundwater). The treated water will leave the settlement tank and travel over

the local vegetation before it makes its way back to the estuary. The unit will have a retention time

of 24 hours and have no chemical additives.

A mixing plant will be assembled alongside the drilling rig to prepare the drilling fluid. This fluid

will be clearbore drilling fluid, a polymer-based product that is designed to instantly break down

and become chemically destroyed in the presence of small quantities of calcium hypochlorite.

The product is not toxic to aquatic organisms and is biodegradable.

A pilot hole will be drilled from the launch pit to the receiver pit, under control of a Gyro Steering

Tool. The hole will then be reamed with the use of the clearbore drilling fluid. Fluid and cuttings

will be separated in a mud mixing/recycling unit and the fluid will be re-used. Cuttings (gravel

chippings) will be transported to a suitable licensed site for disposal.

The loss of drilling fluid can occur a result of the geological formation that is being drilled through.

A brecciated or fractured formation will result in the loss of drilling fluid through cracks, voids and

fractures. If the pressure of the drilling fluid drops suddenly this can be a signal that there is a

loss of drilling fluid and a frac-out is taking place.



The method for reducing the drilling fluid losses and thereby control the consumption of water and

drilling fluid products is to identify the point of losses and seal the area off. The task is complex

and relies heavily on the experience of personnel and reliable, accurate drilling records interpreted

in relation to the geotechnical information available. Trends during the pilot drilling will be

monitored and tracked so as to maximise the chances of accurately establish a point where the

formation is causing drilling fluid losses.

At the location a number of measures can be implemented as follows:

➢ Pump a pill of drilling fluid with a higher density into the formation;

➢ Circulate and pump LCM into the loss zone;

➢ Grout the loss zone; and/or

➢ Launch a packer before the loss zone.

It is recommended that all options are prepared for application during the HDD works.

After boring of the pilot hole along the design path is complete, the drill head is removed, and the

hole willl be reamed with the required reamer while injecting the drilling fluid. Once the reaming

and any cleaning stages are completed all fluid will be transported back to the drilling rig side for

recycling using pumps and will be disposed off site by a licensed carrier.

After the pilot hole has been enlarged to a slightly larger diameter than the proposed pipeline by

the reaming process, the 200mm HPPE PE 100 SDRr11 rising main pipeline will be installed

using the pullback technique. The rising main will then be welded to the installed section of rising

main installed through open cut methodology and pressure tested.

9 TIMING/DURATION

Construction of the estuary crossing should be completed prior to commencement of the

proposed Ramelton Main Pumping Station (MPS) to allow enough space for the storage of

equipment and materials. It is envisaged that the open cut section of estuary crossing works will

take approximately two to three weeks to complete. The HDD works section will approximately

take one week to complete. Both tasks could be done in parallel or in series. If the tasks are

completed in series, then the overall duration of the construction works will be approximately three

to four weeks.



APPENDIX 1 – PLAN AND LONGITUDINAL SECTION OF

THE RISING MAIN CROSSING

(ED R

athmelton)

BALLYBOE

Quay

(Site of)

Rathm

elton Castle

2.9

Mud

15.0

Leannan Bank

15.9

16.9

RO

SSREAG

H

17.2

26.6

18.0

23.5

18.0 UN

D

17.2

25.5

25.5

13.1

13.9

25.7

26.4

25.6

25.6

CR

4.5

HW

M

Hall

HW

M3.8 Under const

3.4

HWM

Mud

Rossreagh Point

BH/RMR/184: MEDIUM STRONGPSAMMITE AT 11m BGL

OWBH/RMR/14:

PSAMMITE BEDROCKAT 0.5m BRBL

OWBH/RMR/15:

WEATHERED PSAMMITE

AT 6.6m BRBLOWBH/RMR/16:

STIFF SILT TO10.5m BRBL

OWBH/RMR/13:

PSAMMITE BEDROCKAT 1m BRBL

R-247

LEANNAN ESTUARYRATHMELTONPUMPING STATION

STRIP OF MATURE OAK WOODLAND

L-5672

COPYRIGHT OFC

modificationsrev.

bydate

4940/CN4/RMR/101Drawing No.

Revision

Client

ProjectRATHMELTON, MILLFORD ANDRATHMULLAN SEW

ERAGESCHEME - CONTRACT NO.4

StagePLANNINGTitle

Scales

SurveyedPrepared By

CheckedDate

JENNINGS O'DONOVAN & PARTNERS LIMITEDCONSULTING ENGINEERS,FINISKLIN,SLIGO,IRELAND.TEL. (0035371) 9161416.FAX. (0035371) 9161080.Em

ail. [email protected]

eb. www.jodireland.com

LEANNAN ESTUARY RISING MAINCROSSING

NOTES:1 FIGURED DIMENSIONS ONLY TO BE TAKEN FROM THIS DRAWING.2 ALL DRAWINGS TO BE CHECKED BY THE CONTRACTOR ON SITE.3 ENGINEER TO BE INFORMED OF ANY DISCREPANCIES BEFORE ANY WORK COMMENCES.4 THIS DRAWING TO BE READ IN CONJUNCTION WITH ALL OTHER RELEVANT DRAWINGS AND SPECIFICATIONS.

1:1250 (A1) 1:2500 (A3)

IRISH WATER

LEGEN

D

Ordnance Survey Ireland Licence N

o.EN 0002620

© O

rdnance Survey Ireland / Governm

ent of IrelandO

s Map R

ef: 0186-D

LOU

GH

SWILLY SAC

Jan. 2020

LOU

GH

SWILLY SPA

WAYLEAVE

TEMPO

RAR

Y WO

RKIN

G AR

EA

PERM

ANEN

T ACQ

UISITIO

N

200mm

OD

RISIN

G M

AIN

BOR

EHO

LE LOC

ATION

(Note:

BRBL - Below

River Bed Level)

N



APPENDIX 2 – ROCK PROFILE



APPENDIX 2 – SITE INVESTIGATIONS

Depth Sa ple / Tests Field Records

Casi gDepth

Water Depth

LevelOD

- .

Depth

.

.

Lege d Descrip o

Bro ish grey sa dy silty su a gular e to oarse GRAVEL. Sa d is e to oarse.

Weathered PSAMMITE: re o ered as su a gular e to oarse

Wat

er

Back ll

.

.

. B

Samples / Field Records TCR SCR RQD FI

. - .

- .

.

.

GRAVEL of psa ite ith lo o le o te t. Co les are a gular to su a gular of psa iteWeak to ediu stro g lo ally stro g i dis tly thi ly foliated light grey a d grey PSAMMITE. Par ally eathered: loser fra ture spa i g a d dis oloura o o fra ture surfa es

Dis o ui es:

. to degree joi ts, losely spa ed / / , u dula g, rough, pat hy ro ish ora ge stai i g o joi t surfa es

. to degree joi ts, ediu spa ed / / , u dula g, rough, pat hy ro ish ora ge stai i g o joi t surfa es

. to degree joi ts at . to . , slightly u dula g, rough, stro g ro ish ora ge stai i g o joi t surfa es

End of Borehole at 4.20m

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

. B

. - . SPT C N= for / for Ha er SN

=

.

.

.

Project No.

- 5Project Na e:

Clie t:

Clie t's Rep:

Rath ulla Se erage S he e Site I es ga o

Irish Water

Je i gs O'Do o a a d Part ers Li ited

Borehole ID

OWBH/RMR/ 3

Coordi ates

. E

. N

Fi al Depth: .

Eleva o : . OD

Start Date:

E d Date:

/ /

/ /

Driller:

Logger:

+Sheet of

S ale: :

FINAL

Core Barrel Flush Type

T - /T - Air

Re arksDrilled fro spudded oa g pla or .Ro khead hard; progressi g orehole e o d . ot possi le ith a aila le rig a d ari e pla t.

Ter i a o ReasoTer i ated at . elo ri er ed o e tre el hard

edro k; . of o pete t ore re o ered

Last Updated

/ /

Method Pla t Used Top Base Ca le Per ussio Da do . .

Rotary Cori g Ha ji D . .

Water StrikesStru k at Casi g to Ti e i Rose to

Casi g DetailsTo Dia

.

Water AddedFro To

Chiselli g DetailsFro To Ti e hh:

. . :


Casi gDepth

Water Depth

LevelOD

- .

Depth

.

.

Lege d Descrip o

Greyish ro silty sa dy su a gular to su rou ded e to oarse GRAVEL. Sa d is e to oarse.

WEATHERED PSAMMITE BEDROCK: re o ered as sa dy slightly silty

Wat

er

Back ll

.. B

Samples / Field Records TCR SCR RQD FI

. - .

- .

- .

- .

.

.

.

.

.

.

su a gular e to oarse GRAVEL of psa ite ith lo o le o te t. Sa d is e to oarse. Co les are a gular to su a gular of

psa ite.Mediu stro g lo ally eak thi ly foliated light grey a d dark grey PSAMMITE. Par ally eathered: loser fra ture spa i g, dis oloura o a d silt deposits o fra ture surfa es. Dis o ui es:

. to degree folia o fra tures, losely spa ed / / slightly u dula g, s ooth, pat hy ro ish ora ge a d pat hy light grey silt o fra tures.

Mediu stro g lo ally eak thi kly foliated grey ith losely spa ed irregular la k a ds SEMI-PELITE. Par ally eathered: loser fra ture spa i g a d silt deposits o fra ture surfa es.

Dis o ui es:. to degree folia o fra tures, losely spa ed / /

pla ar, s ooth, pat hy light grey silt o fra ture surfa es. . to degree joi ts at . to . , a d . to . ,

stepped, rough, lea .

Mediu stro g lo ally eak thi ly foliated grey PSAMMITE. Par ally eathered: loser fra ture spa i g a d silt deposits o fra tures surfa es. Dis o ui es:

. to degree folia o fra tures, losely spa ed / / slightly u dula g, s ooth ith pat hy light grey silt o fra ture surfa es.


.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

. B

. - . SPT C N= for / for Ha er SN

=

.

.

.

.

.

.

Project No.

-Project Na e:

Clie t:

Clie t's Rep:


Irish Water


Borehole ID

OWBH/RMR/

Coordi ates

. E

. N

Fi al Depth: .

Eleva o : - . OD

Start Date:

E d Date:

/ /

/ /

Driller:

Logger:

Sheet of

S ale: :

FINAL


SK L/T - Air

Re arksDrilled fro spudded oa g pla or .Ro khead hard; progressi g orehole e o d . ot possi le ith a aila le rig a d ari e pla t.

Ter i a o ReasoTer i ated at . elo ri er ed o e tre el hard

edro k; . of o pete t ore re o ered

Last Updated

/ /


Rotary Cori g Ha ji D . .



.

Water AddedFro To


. . :


Casi gDepth

Water Depth

LevelOD

- .

- .

Depth

.

.

Lege d Descrip o

Greyish ro silty sa dy su a gular to su rou ded e to oarse GRAVEL ith lo o le o te t. Sa d is e to oarse.

Possi le Weathered PSAMMITE: re o ered as su a gular e to oarse GRAVEL of psa ite ith lo o le o te t. Co les are

a gular to su a gular of psa ite.End of Borehole at 1.43m

Wat

er

Back ll

.

.

.

.

.

.

.

.

.

.

.

.

.

.

. - . SPT S N= for / for Ha er SN =

.

Project No.

-Project Na e:

Clie t:

Clie t's Rep:


Irish Water


Borehole ID

OWBH/RMR/ A

Coordi ates

. E

. N

Fi al Depth: .

Eleva o : - . OD

Start Date:

E d Date:

/ /

/ /

Driller:

Logger:

Sheet of

S ale: :

FINAL

Re arksDrilled fro spudded oa g pla or .To o r shallo ro khead fou d i OWBH/RMR/

Ter i a o Reaso

Refusal o eathered edro k at . elo ri er ed

Last Updated

/ /



Casi g DetailsTo Dia eter

.

Water AddedFro To


. . :


Casi gDepth

Water Depth

LevelOD

- .

- .

- .

Depth

.

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.

Lege d Descrip o

G eyish o sa dy silty su a gula to su ou ded e to oa se GRAVEL. Sa d is e to oa se.

Ve y so g eyish o slightly sa dy slightly g a elly o ga i SILT ith shell f ag e ts. Sa d is e to oa se. G a el is su a gula to

su ou ded e to ediu .

Mediu de se g eyish o sa dy slightly silty su a gula e to oa se GRAVEL. Sa d is e to oa se.

BOULDER of PSAMMITE.

Wat

er

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. B

. B

. - . SPT S N= , / , , , Ha e SN = .

. B

- .

- .

- .

- .

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.

Fi to s o ish g ey slightly sa dy g a elly SILT ith lo o le a d oulde o te t. Sa d is e to oa se. G a el is su a gula to su ou ded e to oa se. Co les a d oulde s a e su ou ded.

BOULDER of PSAMMITE.

Ve y s g ey slightly g a elly sa dy SILT ith lo o le a d oulde o te t. Sa d is e to oa se. G a el is su a gula to su ou ded

e to oa se. Co les a d oulde s a e su a gula to su ou ded.

Weathe ed PSAMMITE. D ille s Des ip o

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.

. - . SPT S N= fo / fo Ha e SN =

.

. - . SPT C N= , / , , , Ha e SN = .

. - . SPT C N= , / , , , Ha e SN =

.

Wate st ike at .

Samples / Field Records TCR SCR RQD

NR

FI

- .

- .

.

.

Mediu st o g lo ally e y st o g i dis tly thi ly foliated da k g ey PSAMMITE. Pa ally eathe ed: lose f a tu e spa i g, dis olou a o a d silt deposits o f a tu e su fa es.Dis o ui es:

. to deg ee joi ts, losely spa ed / / u dula g, ough, o a gish o stai i g a d o ish g ey pat hy silt o

f a tu e su fa es.

Weak lo ally ediu st o g thi kly foliated g ey ith losely pa ed i egula la k a ds SEMI-PELITE ith losely spa ed a o

a ds of hite ua tzite. Pa ally eathe ed: lose f a tu e spa i g, dis olou a o a d silt deposits o f a tu e su fa es.Dis o ites:

.

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Project No.

- 5Project Na e:

Clie t:

Clie t's Rep:


Irish Water


Borehole ID

OWBH/RMR/ 5

Coordi ates

. E

. N

Fi al Depth: .

Eleva o : - . OD

Start Date:

E d Date:

/ /

/ /

Driller:

Logger:

Sheet of

S ale: :

FINAL


SK L Air

Re arksDrilled fro spudded oa g pla or .

Ter i a o Reaso

Borehole ter i ated i edro k at . elo ri er ed

Last Updated

/ /

Method Pla t Used Top Base Ca le Pe ussio Da do . .

Rota y D illi g Ha ji D . .Rota y Co i g Ha ji D . .

Water StrikesSt u k at Casi g to Ti e i Rose to

. .


.

Water AddedF o To

Chiselli g DetailsF o To Ti e hh:

. . :

Depth Sa ples / Field Records

Samples / Field Records

TCR

TCR

SCR

SCR

RQD

RQD

FI

>

FI

Casi g Depth

Water Depth

LevelOD

- .

- .

Depth

.

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.

.

Lege d Descrip o

Weak lo ally ediu st o g thi kly foliated g ey ith losely pa ed i egula la k a ds SEMI-PELITE ith losely spa ed a o

a ds of hite ua tzite. Pa ally eathe ed: lose f a tu e spa i g, dis olou a o a d silt deposits o f a tu e su fa es.Dis o ites:

Mediu st o g lo ally eak thi ly foliated g ey PSAMMITE. Pa ally eathe ed: lose f a tu e spa i g, dis olou a o a d silt deposits o f a tu e su fa es. Dis o ui es:

. to deg ee folia o f a tu es, losely spa ed / / pla a , s ooth, pat hy o a ge stai i g a d pat hy light g ey silt o f a tu e su fa es.


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Project No.

- 5Project Na e:

Clie t:

Clie t's Rep


Irish Water


Borehole ID

OWBH/RMR/ 5

Coordi ates

. E

. N

Fi al Depth: .

Eleva o : - . OD

Start Date:

E d Date:

/ /

/ /

Driller:

Logger:

Sheet of

S ale: :

FINAL


SK L Air


Ter i a o Reaso

Borehole ter i ated i edro k at . elo ri er ed

Last Updated

/ /

Method Pla t Used Top Base Ca le Pe ussio Da do . .

Rota y D illi g Ha ji D . .Rota y Co i g Ha ji D . .

Water StrikesSt u k at Casi g to Ti e i Rose to

. .


.

Water AddedF o To

Chiselli g DetailsF o To Ti e hh:

. . :


Casi gDepth

Water Depth

LevelOD

- .

- .

Depth

.

.

Lege d Descrip o

Fir to s ro ish grey sa dy gra elly silty CLAY ith lo o le a d oulder o te t. Sa d is e to oarse. Gra el is su a gular to su rou ded e to oarse. Co les a d oulders are su rou ded.

S to ery s grey slightly sa dy slightly gra elly layey SILT ith lo o le a d oulder o te t. Sa d is e to oarse. Gra el is su a gular to su rou ded e to oarse. Co les a d oulders are su a gular to su rou ded.

S to ery s grey slightly sa dy slightly gra elly silty CLAY ith lo o le a d oulder o te t. Sa d is e to oarse. Gra el is su a gular to su rou ded e to ediu .

Wat

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. B

. B

. D

. - . SPT S N= , / , , , Ha er SN = .

. B

. D

. - . SPT S N= , / , , , Ha er SN = .

. B

. D

. - . SPT S N= , / , , , Ha er SN = .

. B

. D

. - . SPT S N= , / , , , Ha er SN = .

. B

. D

. - . SPT S N= , / , , , Ha er SN =

.

. B

. D

. - . SPT S N= , / , , , Ha er SN = .

Project No.

-Project Na e:

Clie t:

Clie t's Rep:


Irish Water


Borehole ID

OWBH/RMR/

Coordi ates

. E

. N

Fi al Depth: .

Eleva o : - . OD

Start Date:

E d Date:

/ /

/ /

Driller:

Logger:

Sheet of

S ale: :

FINAL


Ter i a o Reaso


Last Updated

/ /




.

Water AddedFro To



Casi gDepth

Water Depth

LevelOD

- .

- .

Depth

.

.

Lege d Descrip o

S to ery s grey slightly sa dy slightly gra elly silty CLAY ith lo o le a d oulder o te t. Sa d is e to oarse. Gra el is su a gular to su rou ded e to ediu .

S to ery s grey slightly sa dy slightly gra elly SILT ith lo o le a d oulder o te t. Sa d is e to oarse. Gra el is

su a gular to su rou ded e to oarse. Co les a d oulders are su a gular to su rou ded.


Wat

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. B

. D

. - . SPT S N= , / , , , Ha er SN = .

. B

. D

. - . SPT S N= , / , , , Ha er SN = .

. B

. D

. - . SPT S N= , / , , , Ha er SN =

.

Project No.

-Project Na e:

Clie t:

Clie t's Rep:


Irish Water


Borehole ID

OWBH/RMR/

Coordi ates

. E

. N

Fi al Depth: .

Eleva o : - . OD

Start Date:

E d Date:

/ /

/ /

Driller:

Logger:

Sheet of

S ale: :

FINAL


Ter i a o Reaso


Last Updated

/ /




.

Water AddedFro To


Depth Sa ple / Tests

Casi gDepth

Water Depth Field Records Level

OD.

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.

Depth Thick ess

..

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.

.

.

Lege d Descrip o

TOPSOILFir ro slightly sa dy slightly gra elly SILT ith lo o le o te t. Sa d is e to oarse. Gra el is su rou ded e to ediu . Co les are su rou ded.

S ro slightly sa dy slightly gra elly SILT ith lo o le o te t. Sa d is e to oarse. Gra el is su rou ded e to ediu . Co les are su rou ded.

Very s grey slightly gra elly sa dy SILT. Sa d is e to oarse. Gra el is su rou ded e to ediu .

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. - . B

. - . B

. - . U . U lo = %

. D

. - . B

. - . SPT SN=

. N= , / , , ,

. - . U . U lo = %

. - . B

. D

. - . B

. - . SPT SN=

. N= , / , , ,Water Strike at

.

. - . U . U lo = %

. - . B

. D

. - . B

. - . SPT SN=

N= , / , , ,

. D

. - . B

. - . SPT SN=

N= , / , , ,

. D

. - . B

. - . SPT SN=

N= , / , , ,

. D

TCR SCR RQD FI

- .

- .

- .

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BOULDER

Fir grey slightly sa dy gra elly CLAY. Sa d is e to oarse. Gra el is su a gular to su rou ded e to oarseFir greyish ro slightly sa dy gra elly CLAY. Sa d is e to oarse. Gra el is su rou ded e to ediu

.

.

. - . N= for / for

- -

Project No.:-

Coordi ates:

. E

. N

Grou d Level:. OD

Project Na e:Ra elto Milford Rath ulla RMR Se erage Sche eClie t:Irish WaterClie t's Represe ta ve:Je i gs O'Do o a & Part ers LtdDates:

/ / - / /

Borehole No.:BH/RMR/184

Sheet of

Scale: :

Driller:

Logger:

Re arksHa d dug i spec o pit exca ated to . .

Ter i ated o irtual refusal at .

Core Barrel

Flush Type

Method Pla t Used Top BaseLight Per ussio Da do Terrier . .

Rotary Cori g D Ha ji . .


. . .

Water AddedFro To


.


Depth TCR

TCR

SCR

SCR

RQD

RQD

FI

>

>

>

>

FI

Field Records LevelOD

- .

- .

- .

- .

- .

- .

- .

Depth Thick ess

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Lege d Descrip o

Mediu stro g thi ly la i ated light grey PSAMMITE. Par ally eathered: silt deposits a d dis oloura o o fra ture surfa es

Dis o ui es:

. - degree joi ts, losely spa ed / / , u dula g, rough, pat hy ora ge a d ro ish yello stai i g ith yello ish grey silt deposits o joi t surfa es

. degree folia o fra ture at . - . , pla ar, rough, pat hy ora ge stai i g a d l of yello ish grey silt of fra ture surfa esMediu stro g lo ally eak , thi kly la i ated light grey PSAMMITE,

arro ly i ter edded ith dark grey PELITE. Par ally eathered: silt deposits a d dis oloura o o fra ture surfa es

Dis o ui es:

. - degree folia o fra tures, losely spa ed / / , slightly u dula g, s ooth, stro g pat hy ora ge a d yello ish ora ge stai i g

ith yello ish grey silt deposits o fra ture surfa esMediu stro g lo ally eak thi kly la i ated light grey PSAMMITE. Par ally eathered: silt deposits a d dis oloura o o fra ture surfa es

Dis o ui es:

. - degree folia o fra tures, losely spa ed / / , pla ar, rough, pat hy ora ge, ora gish yello a d yello ish ro stai s ith pat hy yello ish hite silt deposits o fra ture surfa esMediu stro g thi ly la i ated light grey PSAMMITE. Par ally

eathered: silt deposits a d dis oloura o o fra ture surfa es

Dis o ui es:

. - degree folia o fra tures, ediu spa ed / / , slightly u dula g, rough, pat hy ora ge, yello ish ora ge a d ora gish ro stai s ith pat hy yello ish hite a d light ro silt deposits o fra ture surfa es

. - degree folia o fra tures, ediu spa ed / / , slightly u dula g, rough, pat hy ora ge, yello ish ora ge a d ora gish

ro stai s ith pat hy yello ish hite a d light ro silt deposits o fra ture surfa es

. > degree joi t at . - . , pla ar, rough, pat hy light ora ge stai i g a d pat hy yello ish hite silt deposits o joi t surfa es

At 14.35m: 30mm orangish brown clayAt 14.40m - 14.50m: very narrowly interbedded thin laminations of dark grey pelite and psammiteAt 16.00m - 16.25m: very weak thickly laminated greyish brown psammite -possible fault gouge

Weak lo ally ediu stro g , thi ly la i ated dark grey PELITE. Par ally eathered: silt deposits a d dis oloura o o fra ture surfa es

Dis o ui es:

. - degree folia o fra tures, ery losely spa ed / / , u dula g, s ooth, pat hy ora gish ro stai i g ith pat hy ro silt a d l s of light grey silt o fra ture surfa es

At 18.45m - 18.50m: gravelly dark brown clay - possible fault gouge

Mediu stro g thi ly la i ated light grey PSAMMITE. Par ally eathered: silt deposits o fra ture surfa es

Dis o ui es:

. - degree folia o fra tures, losely spa ed / / , slightly u dula g, rough, pat hy, light grey silt deposits o fra ture surfa es

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Project No.:-

Coordi ates:

. E

. N

Grou d Level:. OD


/ / - / /


Sheet of

Scale: :

Driller:

Logger:



Core Barrel

Flush Type




Water AddedFro To


.


Depth TCR

TCR

SCR

SCR

RQD

RQD

FI

FI

Field Records LevelOD

Depth Thick ess Lege d Descrip o

Mediu stro g thi ly la i ated light grey PSAMMITE. Par ally eathered: silt deposits o fra ture surfa es

Dis o ui es:

. - degree folia o fra tures, losely spa ed / / , slightly u dula g, rough, pat hy, light grey silt deposits o fra ture surfa es

. > degree joi t at . - . , u dula g, rough, pat hy light grey silt deposits o joi t surfa es


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Project No.:-

Coordi ates:

. E

. N

Grou d Level:. OD


/ / - / /


Sheet of

Scale: :

Driller:

Logger:



Core Barrel

Flush Type




Water AddedFro To


.




APPENDIX 4 – TYPICAL PHOTOGRAPHS OF OPEN CUT MARINE WORKS

Documents

Appendix II The Proposed Leannan Crossing Open Cut Methodology