Appendix I The Proposed Leannan Crossing HDD Methodology

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

214

Appendix I – The Proposed Leannan Crossing HDD Methodology

Ramelton, Milford and Rathmullan Sewerage

Scheme

Ramelton Estuary Crossing

HORIZONTAL DIRECTIONAL DRILLING

METHODOLOGY

March 2020

Jennings O’Donovan & Partners Ltd. Consulting Engineers,

Finisklin Business Park, Sligo.

Tel.: 071 9161416 Fax: 071 9161080

email: [email protected]

mailto:[email protected]

____________________________________________________________________________________

Directors: D. Kiely, C. McCarthy

Regional Director: A. Phelan

Consultants: C. Birney, M. Gavin, R. Gillan

Senior Associates: R. Davis, S. Gilmartin, J. Healy, J. McElvaney, T. McGloin

Associates: L. Brennan, S. Lee, S. Martyn, L. McCormack, S. Molloy

Company Reg No. 149104 VAT Reg. No. IE6546504D

JENNINGS O’DONOVAN & PARTNERS LIMITED

Project, Civil and Structural Consulting Engineers, FINISKLIN BUSINESS PARK,

SLIGO,

IRELAND.

Telephone (071) 9161416 Fax (071) 9161080

Email [email protected] Web Site www.jodireland.com

DOCUMENT APPROVAL

PROJECT

Ramelton, Milford and Rathmullan Sewerage Scheme

CLIENT / JOB NO

Irish Water 4940

DOCUMENT TITLE Ramelton Estuary Crossing Horizontal Directional Drilling 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 Client. 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 capaci ty 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

(b) By release of the document to the Third Party, that Third Party does not acquire any rights, contractual or otherwise, whatsoever against JENNINGS O’DONOVAN & PARTNERS LIMITED and JENNINGS O’DONOVAN & PARTNERS LIMITED, accordingly, assume no duties, liabilities or obligations to that Third Party, and

(c) JENNINGS O’DONOVAN & PARTNERS LIMITED accepts no responsibility for any loss or damage incurred by the Client or for any conf lict of JENNINGS O’DONOVAN & PARTNERS LIMITED’s interests arising out of the Client's release of this document to the Third Party.

Document

Rev 0

Name Name

Date

5th March 2020

Signature Signature

Document

Rev 1

Name Name

Date

31st March 2020

Signature Signature

mailto:[email protected]

http://www.jodireland.com/

Jennings O’Donovan Consulting Engineers Sligo _________________________________________________________________________________________________

_________________________________________________________________________________________________ 4940-CN4-RMR-Esturary HDD Methodology Rev 1 i March 2020


Horizontal Directional Drilling Methodology

Ramelton Estuary Crossing

Table of Contents

1 INTRODUCTION 1

2 ESTUARY CROSSING 1

3 SCOPE OF WORK 2

4 SITE PREPARATION 2

5 SITE LAYDOWN DESIGN 2

6 RIG ANCHORAGE AND SET UP 3

7 EXAMPLE OF PLANT LIST FOR HDD 3

8 PILOT HOLE 3

9 SURVEY AND TRACKING 3

9.1 Drill Guide – Gyro Steering Tool (GST) 3

10 PILOT HOLE DRILLING 4

11 REAMING 4

12 DRILLING FLUID – USAGE AND CONTROL 5

13 DRILLING FLUID PRODUCTS 6

14 DRILLING FLUID PARAMETERS 6

15 DRILLING FLUID LOSS 6

16 PIPE INSTALLATION 7

17 PIPE PIGGING AND PROVING 8

18 PILOT HOLE CONTINGENCIES 8

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

APPENDIX 2 - ROCK PROFILE

APPENDIX 3 - SITE INVESTIGATIONS


_________________________________________________________________________________________________ 4940-CN4-RMR-Esturary HDD Methodology Rev 1 1 March 2020


HDD Methodology Estuary Crossing at Ramelton

1 INTRODUCTION

The 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 260m. 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 horizontal directional

drilling (HDD) of the estuary between approximately Ch 0 and Ch 260.

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

The geology of the ground/seabed along the proposed pipeline route consists of mixture

gravelly sandy silt and bedrock. The rock rises to within 500mm of the estuary/river bed at

approximately the mid point of the proposed route of the estuary crossing. Therefore, the HDD

will have to pass through the gravelly sandy silt into the bedrock and back into the gravelly

sandy silt. The rock profile across the estuary can be seen in Appendix 2.

One of the methodologies been considered to install the rising main is by HDD. This is a

trenchless technology technique which is routinely used as an alternative to conventional open

cut and cover trenching or, as in this case, when minimal disturbance to the bed of the estuary is

favoured. This methodology requires the excavation of two pits.– a launch pit and a receiver pit.

In this case the launch pit would be excavated in the grounds of the proposed Ramelton main

pumping station site, commencing at Ch 0 as shown on Dwg. No 4940/CN4/RMR/SD/124.

Approximate dimensions for the excavation would be 10m long x 3m wide x 2m deep. By

reference to boreholes OWBH/RMR/16, excavation would be carried out in stiff to very 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 across the estuary on the north western side at

approximately Ch 260m. Access for plant and personnel will be via the R-247 and the wayleave



as per Dwg. No 4940/CN4/RMR/101. A reception pit with plan dimensions of 3m x 3m and depth

2m would be excavated. As was the case with the drive pit, sides of the excavation can be

battered with no requirement for sheet piling.

3 SCOPE OF WORK

A key component of the project is the launch pit and receiver pit where the HDD technology

and equipment will be used to install the 200mm HPPE PE 100 pipe SDR11 rising main.

The HDD crossing details are as follows:

➢ Hole length (HDD entry to exit): 260 meters approximately.

➢ Rising main diameter: 200mm O.D.

4 SITE PREPARATION

(i) Install hardstanding area or utilise existing surface if deemed acceptable to the

Contractor

(ii) Set up Environmental Control Measures

(iii) HDPE water supply line to rig site

(iv) Establish site office and welfare facilities

(v) Install rig anchor for the HDD rig

(vi) Set out centreline

(vii) Construct storage lagoon

(viii) Set up HDD rig spread

5 SITE LAYDOWN DESIGN

(i) Prepare and set out survey system for pilot hole

(ii) Tool calibration

(iii) Drill pilot hole with motor and drill bit from the launch pit to the reception pit.

(iv) Trip out pilot assembly

(v) Forward Ream using hole opener and bull nose fitted with a tri cone bit.

(vi) Trip in and out the reaming assembly to sufficiently clean the hole

(vii) Position reamer and bull nose and pump clearbore drilling fluid.

(viii) Set up Pipe puller and appropriate anchor mechanism.

(ix) Pig and test Pipeline



6 RIG ANCHORAGE AND SET UP

The drill rig will be set up on the proposed Ramelton Pumping Station site. The HDD should be

completed prior to commencement of the proposed Ramelton pumping station works to allow

enough space for the HDD to take place. Temporary works design will need to be undertaken to

ensure the thrust and pullback forces can be withstood during pilot drilling, reaming and pipe

pulling operations.

7 EXAMPLE OF PLANT LIST FOR HDD

➢ Drilling Rig

➢ Drilling Pump House

➢ Clear Solutions Mixing System

➢ Pipe Puller

➢ Clear Solution Re-cycling System

➢ Holding Tank

➢ Rig Power Unit

➢ Store

➢ Control Cabin

➢ Generator

➢ Trash Pump

➢ Tractor and Bowser

➢ Track Machine

8 PILOT HOLE

The drill Profile will be designed taking into account a number of considerations

➢ Hydraulic design requirements

➢ Formation and rock elevations

➢ Optimum steering radii

➢ Risk reduction on entry and exit angles

9 SURVEY AND TRACKING

9.1 Drill Guide – Gyro Steering Tool (GST)

Gyro steering tool provides highly accurate navigational information of the drill head in real time.

In doing so, it is not affected by any external influences. The Drill Guide GST is an optical gyro

tool that does not require any surface wire grids and is not affected by any external magnetic

interference. The tool does not require to be housed inside a non-magnetic drill collar and

therefore can be positioned nearer to the drill bit, giving accurate hole data as soon as possible.



10 PILOT HOLE DRILLING

Following completion of the survey, coil set-up drilling operations can commence. The initial stage

of drilling requires the assembly of the Bottom Hole Assembly (BHA). Before the drill motor is run

down, orientation of the bent housing and confirmation of the offset will be carried out. This

operation ensures the drillers directional display unit is accurately aligned with the drill motors

bent housing. Drilling will commence as the first length of approximately 9.5m drill pipe is run

down and the first surface survey is taken on the next joint.

The driller will progress the drill bit directed by the downhole surveyor with regard to the drilling

pattern required in achieving the radius design criteria. The drilling superintendent will determine

instructions for the drillers regarding maximum torque and push, and flow rates. Drill parameters

will be monitored and adjusted as required depending on the formation. Under direction from the

downhole surveyor the driller will be required to make minor course corrections to ensure the

design profile is achieved. From the driller’s display console the attitude of the drilling motor is

known, turning of the drill string orientates the drill bit to the required direction. A drill pattern will

be calculated whereby part of the drill rod is pushed without rotation of the drill string but with the

drill bit positioned in an orientation of 0 – 360 degrees. This dead push mode may only be required

for 1 - 2 metres of each joint depending on formation integrity. The remaining joint length will be

rotated so as to prevent a radical direction change from occurring.

It is the responsibility of the downhole surveyor to calculate drill patterns as drilling progresses,

with the driller following pre-set positions marked on the drill pipe where slide and rotation modes

are required. The sequence of drilling procedures outlined will continue until the drill bit exits at

the receiver pit.

11 REAMING

Verification of the survey data and validation of the pilot hole must be approved before

commencement of reaming operations. The reaming assembly will be used in a pull mode of

operation from the receiver pit

A survey tool may be run behind the hole opener (depending on the formation experienced during

pilot drilling) to confirm the tool is running true. It should be noted that the survey tool will only

provide inclination data as the surrounding drill pipe will affect the azimuth readings which will be

unacceptable for use. The inclination data will be beneficial in confirming that the tool is following

the previous drill line, particularly when building out of the first curve onto the horizontal section



of the hole. The hole opener will be progressed as the pilot hole with a length of drill pipe drilled

down and the next placed onto the rig floor for screw in.

If a survey tool is being run the wireline will be connected as with pilot drilling operations. A

conventional Tensor survey probe (TruTrack) will be used behind the hole opener. Surveys will

not be required as with the pilot hole drilling, the raw inclination data provided by the drillers

console will be sufficient for confirming the accuracy of hole openers.

As the hole opener progresses, swabbing of each joint to improve hole cleaning will be carried

out if the formation offers suitable resistance when cut. Swabbing the hole is the final step before

installing the product line and is performed by pulling a plug through the hole to remove cutting

debris and drilling fluid. Swabbing with the hole opener cannot be considered if formation strength

cannot support the tool, which could result in the tool dropping and losing its alignment with the

pilot hole.

12 DRILLING FLUID – USAGE AND CONTROL

During all phases of pilot drilling, hole opening and hole cleaning drilling fluid will be pumped. The

drilling fluid is pre-mixed on the surface before being pumped downhole via high pressure plunger

pumps. The flow rate of the fluid will be variable and depends on formation strengths and

particular tooling / nozzle configuration in use.

Prior to commencing works the mud pumps will be checked. As drilling progresses replacement

of the fluid end components may be required. Such components are a standard inclusion in the

spare parts inventory that will be mobilised with the high pressure pump.

On the surface, drilling fluid is mixed and delivered to the static active tank, which directly feeds

the high pressure plunger pump. Controls for the pressure pump is housed in the driller’s cabin

where volumes pumped can be adjusted to compensate for formation strengths encountered.

During pilot hole drilling and upsizing stages of the reaming process mud pumped downhole will

return to the surface and will be contained in the lagoon at the entry position. By way of an

electrical submersible slurry pump the drilling fluid will be transferred to the mud cleaning system.

The multi screened cleaning system will separate the cuttings from the fluid enabling the fluid to

be returned to the mixer and static holding tanks and then re-used downhole. Solids removed

from the mud returns will be collected in the holding pit excavated beneath the discharge chutes



attached to the mud cleaning shaker units. When sufficient solids have been deposited into the

holding pit they will be disposed to an approved disposal site.

13 DRILLING FLUID PRODUCTS

The drilling fluid used during the works will be clearbore. Clearbore is 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

biodegradable.

Mud mixing will be monitored to suit the ground conditions encountered and will initially be based

on a mud programme developed by the specialised HDD Contractor and the drilling fluid supplier

and Environmental expert.

The drilling fluids will be constantly monitored, and any changes required to the mix will be

performed on site by specialised HDD Contractor upon consultation with the drilling fluid supplier

and Ecological Clerk of Works (ECoW), appointed during the construction stage of the project by

the Employer.

14 DRILLING FLUID PARAMETERS

While drilling progresses mud returned to the lagoon will be checked for solids content and overall

fluid weight. It is envisaged that fluid returns will be maintained throughout the pilot, reaming and

cleaning stages. It is expected that mud weights will be high once all stages are completed. The

magnitude of the mud weight will depend on many factors but it could be as high as 1.4 (SG).

Mud testing equipment will be available at all times during drilling operations to monitor key mud

parameters.

15 DRILLING FLUID LOSS

The loss of drilling fluid can occur as 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 a frac-out occurs there will be a loss in drilling pressure, this is a signal to

the operator that an issue has arose with the drilling process. Clearbore drilling fluid is used to

minimise the risk to the environment in the case of a frac-out. There are a number of contingency

options available.

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 drilling fluid with a higher density into the formation.

➢ Circulate and pump organic lost circulation materials (LCM) into the loss zone to physically

seal the fracture. Lost circulation occurs when drilling fluid, flows into one or more

geological formations instead of returning to the launch area.

➢ Grout the loss zone; and/or

➢ Launch a packer before the loss zone. A packer is a mechanical device sent down the

hole to the area of concern. It is designed for blocking the system for sealing grout to set.

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

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.

Spill kits, including 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.

16 PIPE INSTALLATION

The 200mm HPPE PE 100 SDR11 rising main will be welded in one section using fully automatic

butt-welding techniques.

➢ All external beads will be removed and tested detailed in the welding procedure and

retained for reference.

➢ Sample welds will be cut out during the welding process and will be subjected to

destructive testing.

➢ The joint will be allowed to fully cool prior to testing.

➢ The section of pipe will be hydrostatically tested to the required standard

➢ The procedure of the pipe pulling operation will take place.

https://en.wikipedia.org/wiki/Drilling_fluid



17 PIPE PIGGING AND PROVING

Pipe pigging and proving assembly will be set up at the launch pit. The pigging assembly will pass

through the pipe using compressed air. Pigging is completed to clean the internal of the pipe of

any debris and inspect the pipeline for any damage after installation.

18 PILOT HOLE CONTINGENCIES

The pilot hole drilling will progress from entry to exit, however there are several reasons why the

drill string may need to be recovered back to surface before completion of the pilot hole has been

achieved for e.g.

➢ Unable to maintain acceptable profile / alignment caused by steering difficulties

➢ Mud fracture to surface / formation.

Damaged or malfunctioning components will be required to be replaced as required for the HDD

works to continue.


_________________________________________________________________________________________________ 4940-CN4-RMR-Esturary HDD Methodology Rev 1 March 2020

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

Leannan Bank

HWM

Market Sq.

StreetPoun

d

Market Sq.

StreetPoun

d

HWM

ROSSREAGH

HWM HWM

Quay

Mud

Rathmelton Castle (Site of)

Hall

26.4

9.2

23.5

26.6

15.9

16.9

17.2

18.0

18.0

3.4

3.6

2.9

4.5

6.5

-4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9

10 11 12 13 14

15 16 17

-5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

Chainage

Ground Level

Pipe

Valve Chainage

Surface

RISIN

G M

AIN PIPELIN

E FRO

M R

ATHM

ELTON

TO L-1392-2 JU

NC

TION

- SHEET 1

Scale: Horizontal 1:1000

Scale: Vertical 1:100

CU

MU

LATIVE CH

AINAG

E 0m.

CU

MU

LATIVE CH

AINAG

E 560m.

01.RT

RT-D

AV-01

RT-SV-H

P-01

WATER

RO

AD

200mm

O.D

. HPPE PE 100 SD

R 11 R

ISING

MAIN

WATER

FIELD

PIPE GR

ADED

02.RT02.RT

FIELD

RISIN

G M

AIN PIPELIN

E FRO

M R

ATHM

ELTON

TO L-1392-2 JU

NC

TION

- SHEET 1

Scale: Horizontal 1:2000

Scale: Vertical 1:200

COPYRIGHT OFC

modificationsrev.

bydate

Drawing No.Revision

ClientIRISH WATER

Project

StageCONTRACTTitle

Scales1:1000 & 100 @ (A1)Surveyed

Prepared ByChecked

Date

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

ail. [email protected]

eb. www.jodireland.com

MURPHYS

Ordnance Survey Ireland Licence N

o.EN 0002619

© O

rdnance Survey Ireland / Governm

ent of Ireland

LAYOUT PLANScale 1:1000 (A1)

N

PRO

POSED

RAM

ELTON

PUM

PING

STATION

OS SHEET Donegal No.0146,0164,0165,0166, 0186 & 0187

RO

SSREAG

H

LEANNAN

RAM

ELTON

01.R

T

To MILFO

RD

To RAMELTON

IND

EX PLAN - N

TS RAM

ELTON

RATH

MU

LLAN

MILFO

RD

124

4940-CN4-RMR-SD-124

RAMELTON, MILFORD ANDRATHMULLAN SEW

ERAGE SCHEMECONTRACT No. 4

RAMELTON TO L-1392-2 RISING MAINLAYOUT PLAN AND LONGITUDINALSECTIONSHEET 1 OF 6

Draft Issue for DCC ReviewA

LB12/18

225

NO

TE : THIS M

AP IND

ICATED

THE APPR

OXIM

ATE LOC

ATION

OF SER

VICES.

BEFOR

E ANY EXC

AVATION

IS UN

DER

TAKEN, TH

E ACTU

AL LOC

ATION

OF ALL

SERVIC

ES MU

ST BE ESTABLISHED

AND

VERIFIED

.

LEGEN

D:

PRO

POSED

NO

DE show

n thus

PRO

POSED

HYD

RAN

T shown thus

PRO

POSED

AIR VALVE show

n thus

PRO

POSED

SLUIC

E VALVE & HATC

H BO

Xshow

n thus

PRO

POSED

RAW

WATER

MAIN

shown thus

PRO

POSED

TRU

NK M

AIN show

n thus

PRO

POSED

DISTR

IBUTIO

N M

AIN show

n thus

EXISTING

MAIN

shown thus

ESB POW

ER LIN

ES CR

OSSIN

G R

OAD

EIRC

OM

CABLES show

n thus

ESB - MV & LV O

VERH

EAD LIN

ES

EXISTING

RO

AD SIG

N show

n thus

DAV-N

o.

Hyd-N

o

SLV-HP- N

o.

NO

TES1.

Levels are in meters O

.D and refer to M

alin Head D

atum.

2.This D

rawing is to be read in conjunction w

ith all otherrelevant docum

entation.3.

Do not scale from

this drawing, use only printed dim

ensions.4.

All dimensions in m

illimetres, all chainages, levels and coordinates are in

metres unless defined otherw

ise.5.

This drawing is to be read in conjunction w

ith the project Health and

Safety File for any identified potential risks.6.

For Existing Services see SI report and drawings from

providers.C

ontractor to identify and verify the position of all services on site.6.

All Pipework to be laid at m

inimum

gradient 1:300.7.

Minim

um cover to Pipelines 1000m

m.

8.Extensive trial holes to be dug prior to w

orks comm

encing on site -all services to be located, identified and depths recorded. Protection of allexisting services to be agreed w

ith RE on site depending on depth and

location in relation to our works.

EXISTING

SUS SU

RVEY LEG

END

Foul

Surface

Com

bined

Overflow

Pumped line

P.F.R. Plotted From

Records

U.T.F. U

nable To Find

U.T.S. U

nable To Survey

U.T.L. U

nable To Lift

Pipe diameter of

major outgoing pipe

TEXT ANN

OTATIO

N

Manhole R

ef.

Survey Status

Cover Level

Invert Level

6901

Yes

40.740

X:38.340

?.M

D

MARCH 2019

B

Post Detail Design ReviewB

LB03/19

RT-AC

C-02

RT-AC

C-03

RT-AC

C-01

02.R

T



APPENDIX 2 – ROCK PROFILE



APPENDIX 3 – 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

.

.

.

.

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

Back ll

.

.

.

.

. B

. B

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

. B

- .

- .

- .

- .

.

.

.

.

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

.

.

.

.

.

.

.

.

.

.

. - . 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:

.

.

.

.

.

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:

. . :


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

er

Back ll

.

.

.

.

.

.

.

.

.

.

.

.

.

.

. 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

er

Back ll

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

. 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.

.

.

Depth Thick ess

..

.

.

.

.

.

.

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 .

Wat

er Back ll

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

. - . 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

- .

- .

- .

.

.

.

.

.

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

.

.

.

.

.

.

.

.

.

.

.

.

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

Wat

er Back ll

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

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


Wat

er Back ll

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

Project No.:-

Coordi ates:

. E

. N

Grou d Level:. OD


/ / - / /


Sheet of

Scale: :

Driller:

Logger:



Core Barrel

Flush Type




Water AddedFro To


.


Documents

Appendix I The Proposed Leannan Crossing HDD Methodology