appendix ii the proposed leannan crossing open cut methodology
TRANSCRIPT
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]
____________________________________________________________________________________
Directors:
Regional Director:
Consultants:
Senior Associates:
Associates:
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 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
Signature Signature
Document
Rev 3
Name Name
Date
6th April 2020
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Jennings O’Donovan Consulting Engineers Sligo _________________________________________________________________________________________________
_________________________________________________________________________________________________ 4940-CN4-RMR-Esturary Open Cut Trench Methodology i April 2020
Ramelton, Milford and Rathmullan Sewerage Scheme
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
Jennings O’Donovan Consulting Engineers Sligo _________________________________________________________________________________________________
_________________________________________________________________________________________________ 4940-CN4-RMR-Esturary Open Cut Trench Methodology April 2020
Ramelton, Milford and Rathmullan Sewerage Scheme
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
Jennings O’Donovan Consulting Engineers Sligo _________________________________________________________________________________________________
_________________________________________________________________________________________________ 4940-CN4-RMR-Esturary Open Cut Trench Methodology April 2020
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
Jennings O’Donovan Consulting Engineers Sligo _________________________________________________________________________________________________
_________________________________________________________________________________________________ 4940-CN4-RMR-Esturary Open Cut Trench Methodology April 2020
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.
Jennings O’Donovan Consulting Engineers Sligo _________________________________________________________________________________________________
_________________________________________________________________________________________________ 4940-CN4-RMR-Esturary Open Cut Trench Methodology April 2020
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.
Jennings O’Donovan Consulting Engineers Sligo _________________________________________________________________________________________________
_________________________________________________________________________________________________ 4940-CN4-RMR-Esturary Open Cut Trench Methodology April 2020
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.
Jennings O’Donovan Consulting Engineers Sligo _________________________________________________________________________________________________
_________________________________________________________________________________________________ 4940-CN4-RMR-Esturary Open Cut Trench Methodology April 2020
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.
Jennings O’Donovan Consulting Engineers Sligo _________________________________________________________________________________________________
_________________________________________________________________________________________________ 4940-CN4-RMR-Esturary Open Cut Trench Methodology April 2020
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.
Jennings O’Donovan Consulting Engineers Sligo _________________________________________________________________________________________________
_________________________________________________________________________________________________ 4940-CN4-RMR-Esturary Open Cut Trench Methodology April 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
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_________________________________________________________________________________________________ 4940-CN4-RMR-Esturary Open Cut Trench Methodology April 2020
APPENDIX 2 – ROCK PROFILE
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_________________________________________________________________________________________________ 4940-CN4-RMR-Esturary Open Cut Trench Methodology April 2020
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:
. . :
Depth Sa ple / Tests Field Records
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.
End of Borehole at 7.40m
.
.
.
.
.
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.
. B
. - . SPT C N= for / for Ha er SN
=
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.
.
.
Project No.
-Project 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/
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
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
/ /
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:
. . :
Depth Sa ple / Tests Field Records
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
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. - . SPT S N= for / for Ha er SN =
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Project No.
-Project 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/ 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
/ /
Method Pla t Used Top Base Ca le Per ussio Da do . .
Water StrikesStru k at Casi g to Ti e i Rose to
Casi g DetailsTo Dia eter
.
Water AddedFro To
Chiselli g DetailsFro To Ti e hh:
. . :
Depth Sa ple / Tests Field Records
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.
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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:
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/ 5
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
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
. .
Casi g DetailsTo Dia
.
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
.
.
.
.
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.
End of Borehole at 11.10m
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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/ 5
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
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
. .
Casi g DetailsTo Dia
.
Water AddedF o To
Chiselli g DetailsF o To Ti e hh:
. . :
Depth Sa ple / Tests Field Records
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:
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/
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 .
Ter i a o Reaso
Refusal o eathered edro k at . elo ri er ed
Last Updated
/ /
Method Pla t Used Top Base Ca le Per ussio Da do . .
Water StrikesStru k at Casi g to Ti e i Rose to
Casi g DetailsTo Dia eter
.
Water AddedFro To
Chiselli g DetailsFro To Ti e hh:
Depth Sa ple / Tests Field Records
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.
End of Borehole at 10.50m
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. 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:
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/
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 .
Ter i a o Reaso
Refusal o eathered edro k at . elo ri er ed
Last Updated
/ /
Method Pla t Used Top Base Ca le Per ussio Da do . .
Water StrikesStru k at Casi g to Ti e i Rose to
Casi g DetailsTo Dia eter
.
Water AddedFro To
Chiselli g DetailsFro To Ti e hh:
Depth Sa ple / Tests
Casi gDepth
Water Depth Field Records Level
OD.
.
.
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 .
Wat
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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 StrikesStru k at Casi g to Ti e i Rose to
. . .
Water AddedFro To
Casi g DetailsTo Dia
.
Chiselli g DetailsFro To Ti e hh:
Depth TCR
TCR
SCR
SCR
RQD
RQD
FI
>
>
>
>
FI
Field Records LevelOD
- .
- .
- .
- .
- .
- .
- .
Depth Thick ess
.
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.
.
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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
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 StrikesStru k at Casi g to Ti e i Rose to
Water AddedFro To
Casi g DetailsTo Dia
.
Chiselli g DetailsFro To Ti e hh:
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
End of Borehole at 19.90m
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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 StrikesStru k at Casi g to Ti e i Rose to
Water AddedFro To
Casi g DetailsTo Dia
.
Chiselli g DetailsFro To Ti e hh:
Jennings O’Donovan Consulting Engineers Sligo _________________________________________________________________________________________________
_________________________________________________________________________________________________ 4940-CN4-RMR-Esturary Open Cut Trench Methodology April 2020
APPENDIX 4 – TYPICAL PHOTOGRAPHS OF OPEN CUT MARINE WORKS