THIS DOCUMENT IS INCLUDED IN THE CMSP TENDER
DOCUMENTS FOR INFORMATION ONLY
APPROXIMATELY 30% OF THE WORKS DESCRIBED HEREIN
ARE COMPLETE, INCLUDING THE CULVERT AT BRAY
BRIDGE AND THE RIVER WIDENING AT AREA 5 (LA VALLEE
TO THE SLANG)
THE DOCUMENT WILL PROVIDE INFORMATION TO INDICATE
THE COMPLEXITY AND TYPE OF WORKS TO BE MANAGED
BY THE CMSP
Comhairle Baile Bhré
Bray Town Council
Oifig na nOibreacha Poibli
The Office of Public Works
PROJECT:
River Dargle Flood Defence Works
Tender Documents
DOCUMENT:
Volume A – Works Requirements
DATE:
October 2010 10th April 2014
THIS DOCUMENT WAS PREPARED FOR THE CONTRACT THAT SIAC
PART COMPLETED (IN CMSP TENDER 2014 FOR INFORMATION only )
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
Comhairle Baile Bhré
Oifig na nOibreacha Poibli
Bray Town Council
The Office of Public Works
River Dargle Flood Defence Works
Tender Documents
Volume A – Works Requirements
Contents amendment record
This document has been issued and amended as follows:
Revision
Description
Author(s)
Reviewed
Approved
Date
Rev 0
Issued for Review/Discussion
COS
TMcK
JDB
Oct 2010
Rev A
Issued for Tender
COS
TMcK
JDB
27 Oct ‘10
TABLE OF CONTENTS
Page i
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
SECTION 1 – PROJECT OVERVIEW .......................................................................................7
SECTION 2 – PROJECT DESCRIPTION ............................................................................... 10
2.1
General .......................................................................................................................... 10
2.2
Work Areas .................................................................................................................... 11
2.2
2.2.1
Area 1 – Harbour Bridge to Bray Bridge ........................................................... 11
2.2.2
Area 2 – Bray Bridge ........................................................................................ 13
2.2.3
Area 2A – Culvert Option at Bray Bridge.......................................................... 15
2.2.4
Area 3 – Bray Bridge to the western edge of People’s Park ............................ 16
2.2.5
Area 4 – Western edge of People’s Park to La Vallee ..................................... 17
2.2.6
Area 5 – La Vallee to N11 Bridge .................................................................... 19
Fishery Zones ................................................................................................................ 20
2.2.1
General ............................................................................................................. 20
2.2.2
Zone 1 – N11 Bridge to downstream end of La Vallee .................................... 20
2.2.3
Zone 2 – Downstream end of La Vallee to the downstream end of The Slang 20
2.2.4
Zone 3 – Downstream End of the Slang to Upstream End of People’s Park ... 21
2.2.5
Zone 4 – Upstream End of People’s Park to Bray Bridge ................................ 21
SECTION 3 – THIRD PARTY CONSENTS AND INTERFACES ........................................... 22
3.1
Works in a Water Course .............................................................................................. 22
3.2
Planning Consent .......................................................................................................... 22
3.3
Possession of the Site ................................................................................................... 22
3.4
Landowners ................................................................................................................... 22
3.5
Interfaces with Other Construction Contracts................................................................ 23
3.5.1
General ............................................................................................................. 23
3.5.2
Bray Shanganagh Pipelines and Stormtank .................................................... 23
3.5.3
Widening Works to Bray Bridge ....................................................................... 24
3.6
Third Party Agreements & Notifications ........................................................................ 24
3.7
Statutory Undertakers .................................................................................................... 25
SECTION 4 – RESTRICTIONS AND OBLIGATIONS ............................................................ 27
4.1
Phasing and Programme ............................................................................................... 27
4.2
Notice of Construction Activities .................................................................................... 27
4.3
Working Hours ............................................................................................................... 27
4.4
Site Limits ...................................................................................................................... 28
4.5
Flood Events .................................................................................................................. 29
4.6
Advanced Weather Warning System ............................................................................ 30
4.7
Project Liaison Officer ................................................................................................... 30
4.8
Communications Plan .................................................................................................... 31
4.9
Prompt Attention to Complaints or Causes for Complaint ............................................. 31
4.10 Contract Notice Sign ...................................................................................................... 31
4.11 Traffic Management ....................................................................................................... 32
Page ii
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
4.12 Temporary Fencing ....................................................................................................... 32
4.13 Site Security .................................................................................................................. 33
4.14 Progress Reports ........................................................................................................... 33
4.15 Progress Photographs ................................................................................................... 33
4.16 Project Team Workshops .............................................................................................. 34
4.17 Programme .................................................................................................................... 34
4.17.1 General ............................................................................................................. 34
4.17.2 Submission of programme ............................................................................... 35
4.17.3 Default in submission of programmes .............................................................. 36
4.17.4 Preparation of Programmes ............................................................................. 36
SECTION 5 – DRAWINGS AND REPORTS .......................................................................... 41
5.1
Environmental Impact Statement & Approval ................................................................ 41
5.2
Specimen Drawings ....................................................................................................... 41
5.3
CPO Drawings ............................................................................................................... 41
5.4
Reports .......................................................................................................................... 41
5.4.1
Physical Model Report...................................................................................... 41
5.4.2
Site Investigation Reports ................................................................................ 41
5.4.3
Invasive Species Report ................................................................................... 42
5.4.4
Preliminary Hydrogeological Assessment ........................................................ 42
SECTION 6 – PERFORMANCE SPECIFICATION ................................................................ 43
6.1
General .......................................................................................................................... 43
6.2
Planning Permissions and Other Consents, Permits .................................................... 43
6.3
Hydraulic Performance Parameters .............................................................................. 44
6.4
6.3.1
General ............................................................................................................. 44
6.3.2
Design Flood Return Period ............................................................................. 44
6.3.3
Design Water Levels and Velocities ................................................................. 44
6.3.4
Design Considerations ..................................................................................... 44
6.3.5
Freeboard ......................................................................................................... 45
6.3.6
Transition Structures ........................................................................................ 45
6.3.7
Erosion Protection ............................................................................................ 45
6.3.8
Low flow channels ............................................................................................ 45
6.3.9
Drainage ........................................................................................................... 46
Structural Performance Parameters .............................................................................. 47
6.4.1
Design Working Life ......................................................................................... 47
6.4.2
Standard of Defence ......................................................................................... 47
6.4.3
Water loading ................................................................................................... 47
6.4.4
Seepage ........................................................................................................... 47
6.4.5
Existing Defences ............................................................................................. 47
6.4.6
Foundations ...................................................................................................... 48
6.4.7
Corrosion .......................................................................................................... 48
Page iii
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
6.4.8
Cladding to Walls .............................................................................................. 48
6.4.9
Boardwalk ......................................................................................................... 49
6.4.10 Culvert .............................................................................................................. 49
6.4.11 Embankment Design ........................................................................................ 49
6.4.12 Debris Trap ....................................................................................................... 50
6.4.13 Railings and Handrails...................................................................................... 50
6.5
6.6
Architectural Performance Parameters ......................................................................... 51
6.5.1
General ............................................................................................................. 51
6.5.2
Stone Cladding ................................................................................................. 51
6.5.3
Timber/Timber Type Cladding .......................................................................... 51
6.5.4
Boardwalk ......................................................................................................... 51
6.5.5
Roads and Footpaths ....................................................................................... 52
6.5.6
Railings and Handrails...................................................................................... 52
Ecological Performance Parameters ............................................................................. 53
6.6.1
General ............................................................................................................. 53
6.6.2
Contractor’s Ecologist....................................................................................... 53
6.6.3
Invasive Species ............................................................................................... 54
6.6.4
Ecological Constraints on Construction Activities ............................................ 54
6.6.5
Faunal Surveying and Works ........................................................................... 55
6.6.6
Badgers, Otters and Bats ................................................................................. 55
6.6.7
Greater Yellow Cress ....................................................................................... 55
6.6.8
Bats and Birds .................................................................................................. 56
6.6.9
Vegetation Management .................................................................................. 56
6.5.1
Reinstatement .................................................................................................. 57
6.6.10 Dust, Sediment and Mud .................................................................................. 57
6.6.11 Site after Care .................................................................................................. 57
6.7
6.8
Archaeological Performance Parameters...................................................................... 58
6.7.1
Contractor’s Archaeologist ............................................................................... 58
6.7.2
Archaeology ...................................................................................................... 58
6.7.3
Architectural Heritage ....................................................................................... 59
Landscaping Performance Parameters ......................................................................... 61
6.8.1
Contractor’s Landscape Architect .................................................................... 61
6.8.2
Landscape Design Standards .......................................................................... 61
6.8.3
Tree Protection Measures ................................................................................ 62
6.8.4
Vegetation Clearance Operations .................................................................... 62
6.8.5
Landscape Design and Specification ............................................................... 62
6.8.6
Landscape Works ............................................................................................. 63
6.8.7
Area Specific - Landscape Works .................................................................... 68
SECTION 7 – WORKS SPECIFICATION ............................................................................... 73
Page iv
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
7.1
General .......................................................................................................................... 73
7.2
Compounds and Site Access ........................................................................................ 73
7.3
7.4
7.5
7.2.1
Access and Site Boundaries ............................................................................ 73
7.2.2
Contractor Compounds .................................................................................... 74
7.2.3
Notice of Entry .................................................................................................. 74
Site Facilities ................................................................................................................. 74
7.3.1
Contractors Site Accommodation ..................................................................... 74
7.3.2
Site Accommodation for Employer’s Representatives Staff ............................. 74
7.3.3
No Residential Accommodation on Site ........................................................... 75
7.3.4
Cleanliness of the Site ...................................................................................... 76
7.3.5
Electricity & Telecom Supply ............................................................................ 76
7.3.6
Water Supply .................................................................................................... 76
7.3.7
Sanitary Services .............................................................................................. 76
Services and Equipment for the use of the Employer ................................................... 77
7.4.1
Provision of Phones.......................................................................................... 77
7.4.2
Digital Camera .................................................................................................. 77
7.4.3
Survey Instruments ........................................................................................... 77
7.4.4
Protective Clothing ........................................................................................... 78
7.4.5
Attendance on the Employer’s Representative ................................................ 78
7.4.6
Computer Equipment to be Provided ............................................................... 78
7.4.7
Site Vehicles ..................................................................................................... 79
Surveys and Setting Out ................................................................................................ 79
7.5.1
Ordnance Datum, Pre-Contract Levels, and Reference Points ....................... 79
7.5.2
Topographical Survey and Setting Out ............................................................ 79
7.5.3
Line and Level .................................................................................................. 80
7.6
Condition Survey of Existing Properties & Land ........................................................... 80
7.7
Water for Works ............................................................................................................. 80
7.8
Material Storage ............................................................................................................ 80
7.9
Soil Sampling Excavation and Disposal ........................................................................ 80
7.10 Excavated Material ........................................................................................................ 81
7.11 Ground Water Monitoring and Design for Ground Water .............................................. 81
7.12 Reinstatement ............................................................................................................... 81
7.12.1 General ............................................................................................................. 81
7.12.2 Roads & Footpaths ........................................................................................... 81
7.12.3 Riverbed and Banks ......................................................................................... 82
7.12.4 Temporary Works Areas................................................................................... 82
7.13 Operational and Maintenance Requirements ................................................................ 83
7.13.1 Operational Requirements ............................................................................... 83
7.13.2 Maintenance Requirements ............................................................................. 83
7.14 Use of Recycled Materials ............................................................................................. 84
Page v
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
7.15 Use of Sustainable Resources ...................................................................................... 84
7.16 Noise and Vibration ....................................................................................................... 85
7.16.1 Vibration Monitoring.......................................................................................... 86
7.16.2 Noise Suppression and Monitoring .................................................................. 86
7.17 Pollution Control ............................................................................................................ 87
7.18 Protection of Existing Services & Structures On, Under or Over the Site. .................... 87
7.19 Tributaries ...................................................................................................................... 89
7.20 Maintenance of Public Rights of Way............................................................................ 89
7.21 Existing Land Drains & Culverts .................................................................................... 89
7.22 Rock Excavation ............................................................................................................ 89
7.23 Temporary Works .......................................................................................................... 89
7.24 Records ......................................................................................................................... 89
7.25 As Constructed Drawings .............................................................................................. 89
7.26 Record of the Works ...................................................................................................... 90
SECTION 8 – HEALTH AND SAFETY ................................................................................... 91
8.1
General .......................................................................................................................... 91
8.2
Preliminary Safety and Health Plan ............................................................................... 91
8.3
Emergency Arrangements – Contacts .......................................................................... 91
SECTION 9 – CONTRACTOR’S DOCUMENTS .................................................................... 92
9.1
9.2
9.3
Tender Stage ................................................................................................................. 92
9.1.1
Covering Letter and Executive Summary ......................................................... 92
9.1.2
Documents to be Submitted at Tender Stage .................................................. 93
Additional Information Required Prior to Tender Award ................................................ 95
9.2.1
Pension and Sick Pay Scheme ........................................................................ 95
9.2.2
Tax Clearance Certificates ............................................................................... 95
9.2.3
Health and Safety Requirements ..................................................................... 96
9.2.4
Insurances ........................................................................................................ 96
Design Build Works ....................................................................................................... 97
9.3.1
Contractor’s Documents for Acceptance .......................................................... 97
9.4
As Built Contract Drawings ............................................................................................ 97
9.5
Handover and Completion ............................................................................................. 98
9.5.1
Handover Plan .................................................................................................. 98
9.5.2
Handover Workshop ......................................................................................... 98
SECTION 10 - TITLE .............................................................................................................. 99
Page vi
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
SECTION 1 – PROJECT OVERVIEW
The purpose of the scheme is to protect the town of Bray, County Wicklow from flooding from
the River Dargle. The Works consist of the design and construction of flood defences, river
widening and regrading along the lower reaches of the River Dargle. The works extend over
approximately 3.3 km of the river from the N11 Bridge to the DART Harbour Bridge. The
flood defences are required to provide protection against a 1 in 100 year fluvial flood and 1 in
200 year tidal flood which has been predetermined and the Contractor will be required to
design the defences to a specified flood level. The Contractor is also required to design and
construct a large bore culvert at Bray Bridge, the only vehicular bridge in Bray Town, to act as
a fourth arch to the bridge .Bray Bridge must remain open for the duration of this work.
The River Dargle is an ecological and archaeological sensitive environment. The Contractor
will be responsible for retaining the services of a suitably qualified and licensed Archaeologist
and Ecologist to oversee the design and construction of the works and to comply with any
restrictions or obligations imposed by the planning process. The proposed works involve
significant construction works in the centre of Bray Town in close proximity to residential and
commercial premises. There will be significant Traffic and Noise Management issues.
Information relating to outline designs that is provided with the Tender documents is for the
Tenderer’s information and assistance in preparing their Tender. The Tenderer takes full
responsibility for the sufficiency of their Tender.
The Contractor, in accordance with the
Conditions of Contract and associated constraints and requirements, is to design and then
construct the flood defences required.
The Contractor shall ensure that his design is
consistent with the parameters used in the Physical Model and detailed in the Physical Model
Report in Volume D of the Contract Documents.
The scheme comprises a variety of flood defences including construction of new sections of
earth embankments, demolition and rebuilding of river walls with extensive stone and
timber/timber-type facing, channel excavation and regrading, and river bank strengthening. A
range of landscape treatments in and adjacent to the river are proposed to mitigate the
impacts of the scheme on the local environment along the river corridor.
Works undertaken by the Contractor shall include, but are not limited to:

Review, assessment and verification of information provided by the Employer’s
Representative;

Detailed design including hydraulic, geotechnical, structural, civil and environmental
design of all components of the Works and any temporary works;

Provision of Contractor’s Documents and information for review by the Employer’s
Representative in a logical manner;
Page 7
Client:
Project Title:

Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
Procurement, construction, installation and completion of the Works in accordance
with the approved programme;

Appointment of a Project Liaison Officer to co-ordinate and oversee all third party
liaison as required by An Bord Pleanala and as detailed in the Contract Documents;

Appointment of suitably qualified Ecologist, Archaeologist and Landscape Architect
as required under the Contract;

Preparation of detailed landscaping plans and designs, liaison and agreement with
the relevant parties affected by such plans.

Undertaking the roles of Project Supervisor Design Process (PSDP) and Project
Supervisor Construction Stage (PSCS) under the Safety, Health and Welfare at Work
(Construction) Regulations 2006, or any amendment thereof effective at the time of
the Contract.

Liaison
with
all
affected
service
providers;
detailed
design
and
construction/installation of all service diversions as required; payment to all service
providers where required; negotiation of and payment for all or any wayleaves
required for service diversions.

Compliance with all constraints as detailed in all or any of the Contract Documents.

Compliance with all statutory requirements.

Liaising with landowners, occupiers and third parties prior to and during the detailed
design and construction of the works.

Co-ordination and co-operation with the Employer’s Representative;

Submission of all as-built records and drawings and the compilation of the design files
and the Safety File;

Making good any defects;
The Contractor’s specific attention is drawn to the fact that the EIS identifies that the River
Dargle is a salmonoid river and as such in-stream works are permitted between 1st May and
30th September only.
It is a restriction of the EIS that the works commence at the upstream end and proceed
downstream in order to facilitate the recovery and re-colonisation of any disturbed areas of
the river. However due to the progression of bridge widening project at Bray Bridge the
Contractor shall prioritise the works in AREA 2 and must undertake the design and
construction of the flood defence works immediately adjacent to Bray Bridge in the first
summer season (May to September) on site, excluding the works to Bray Bridge if he so
desires. The Contractor shall only programme for undertaking works in AREA 2 or AREA 2A
during the first summer season (May – September) or from the second summer season (May
– September) to Contract end.
Page 8
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
The Contractor shall note that the works outlined under Area 2A (Culvert at Bray Bridge) may
not proceed to construction under this contract. The Contractor is required to include the
works as part of his tender providing a design and costing of the works but the Employer will
confirm prior to contract signing whether these works will be undertaken as part of this
contract.
Further details of the contractor’s obligations are given in this document and other contract
documents. While this document attempts to collate all the requirements, restrictions, etc for
the scheme it is the responsibility of the Contractor to review all of the relevant documentation
and to ensure that all requirements, restrictions, etc are addressed and accommodated as
part of his design build submission.
Page 9
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
SECTION 2 – PROJECT DESCRIPTION
2.1
General
The Contractor is required to construct the works in accordance with the restrictions as set
out in the EIS, commence at the upstream end and proceed downstream in order to facilitate
the recovery and re-colonisation of any disturbed areas of the river. However due to the
progression of bridge widening project at Bray Bridge the Contractor shall prioritise the
works in AREA 2 and must undertake the design and construction of the flood defence
works immediately adjacent to Bray Bridge in the first summer season (May to September) on
site, excluding the works to Bray Bridge if he so desires.
The Contractor shall only
programme for undertaking works in AREA 2 or AREA 2A during the first summer season
(May – September) or from the second summer season (May – September) to Contract end.
The Contractor is responsible for the detailed design of the works which must comply with the
requirements of the EIS. The aesthetic finish of the proposed works shall be in accordance
with the EIS. However the Contractor shall note that material contraventions of the EIS may
be submitted for approval to the local planning authority. The local planning authority does
not guarantee that any such contraventions or amendments to the existing planning will be
approved.
The Contractor shall note that the works outlined under Area 2A (Culvert at Bray Bridge) may
not proceed to construction under this contract. The Contractor is required to include the
works as part of his tender providing a design and costing of the works but the Employer will
confirm prior to contract signing whether these works will be undertaken as part of this
contract.
The works have been spit into six AREAS. The limits of these AREAS are detailed on
drawing Y9114–C–101 and are referenced in various locations throughout the Contract
Documents. In brief these areas are as follows:
 Area 1 – Harbour Bridge to Bray Bridge, where works include the construction of flood
defences along each bank and the deepening and widening of the river channel
 Area 2 – Bray Bridge, where works include lowering of the riverbed at Bray Bridge, the
structural underpinning of Bray Bridge and the construction of flood defences along
each bank
 Area 2A – Culvert at Bray Bridge, construction of a 7.4m x 4.0m culvert around Bray
Bridge.
 Area 3 – Bray Bridge to the western edge of People’s Park, where works include
widening and deepening of the river channel, the replacement of existing river walls
and the construction of flood defences along each bank
Page 10
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
 Area 4 – Western edge of People’s Park to La Vallee, where works include regrading
and excavation of the river channel, enhancement of existing defences, provision of
additional defences and construction of a debris trap
 Area 5 – La Vallee to N11 Bridge, where works include deepening and widening of the
river channel and the provision of additional defences.
Please note that these AREAS are different to the ZONES referred to in relation to the
requirements of Inland Fisheries Ireland (IFI). The ZONES, as shown on drawing Y9114–C–
101, for the purpose of fisheries are as follows:

Zone 1 – N11 Bridge to downstream end of La Vallee

Zone 2 – Downstream end of La Vallee to the downstream end of The Slang

Zone 3 – Downstream End of The Slang to Upstream End of People’s Park

Zone 4 – Upstream End of People’s Park to Bray Bridge
The Contractor’s attention is drawn to the phased completion of the works and the
requirements for the completion of each AREA prior to the commencement of the next AREA.
2.2
Work Areas
2.2.1
Area 1 – Harbour Bridge to Bray Bridge
The works in this area include the design and construction of new embankments and new
stone clad flood defence walls to accommodate the required flood defence levels. The works
will also entail the construction of a reinforced concrete (RC) retaining wall on the boundary of
golf course and Ravenswell Road, the provision of an emergency flood relief channel along
north side of the RC retaining wall, realignment of the river upstream of the Harbour Bridge to
provide an improved approach to the bridge piers, the structural underpinning of existing
walls, river widening and regrading work, removal of weir downstream of Bray Bridge,
extension of existing pipe outfalls and installation of new non return valves. The aesthetic
finish for the works in this area will be in accordance with EIS. All proposed finishes shall be
submitted to the Employer’s Representative for approval. It is the proposed that the aesthetic
finish of the works will be as close as possible to the finish of the existing walls to ensure that
the visual impact of works is minimised in so far as possible.
The works as proposed in the vicinity of the golf course lands have been amended since the
preparation of the EIS. The revised proposal is outlined on drawing Y9114–C–103. The
revised proposals relate to the flood defence works proposed at the boundary between the
golf club and Ravenswell Road. The works proposed in all other areas are as outlined in the
EIS. The Contractor’s attention is drawn to the fact that at the time of writing it is envisaged
that the golf course will remain open for the duration of the works and the Contractor is
required to accommodate this in his proposals for construction and traffic management.
Page 11
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
The emergency flood relief channel shall extend from Castle Street, past the rear of Dwyer
Park through the Golf Club Lands. The existing wall at the intersection of St Laurence’s
Terrace and St. Columcille's to the rear of Superquinn shall be removed. The emergency
flood relief channel shall be designed to accommodate a maximum flow of 20m 3/s. This flow
shall discharge by gravity into the main river channel upstream of the Harbour Bridge via
outfalls through the defence line along Ravenswell Road. Non-return valves shall be installed
on the outfalls to prevent ingress of flood water. The non-return valves shall be designed so
that they can discharge the 20m 3/s with the emergency channel water depth at 2.25m AOD.
The works in this area abut the railway bridge at Bray Harbour. Iarnroid Eireann have strict
requirements for works in the vicinity of rail bridges and other Iarnroid Eireann infrastructure.
It is the Contractors responsibility to refer to the guidance document I-DEP-0120 “Guidance
on Third Party Works” and to liaise closely with Iarnroid Eireann regarding the interface
between the Iarnroid Eireann infrastructure and the Contractor’s proposed design.
The
design of the works in this area shall take full cognisance for all and any requirements as set
out by Iarnroid Eireann.
The Contractor shall keep the Employer’s Representative fully
informed of the discussions with Iarnroid Eireann and provide the Employer’s Representative
with the opportunity of attending any liaison meetings. The Contractor shall take account of
all time restrictions that are outlined by IE.
Works in this area will also need to take account of all other construction works that may be
active on site during the construction period of these works. The contracts that are envisaged
to be on site at the same time as this contract are outlined in Section 3 below. However this
is a non-exhaustive list and the Contractor may have to liaise and coordinate with other third
parties.
The proposed works for the south bank are to include reinstatement of the right of way. This
is to be a nominal 2m wide path with a compacted stone fill surface; the depth of construction,
the requirement for sub-base and the requirement for separation membranes or for
strengthening geotextiles is to be determined by the detailed design. Suitable edging is to be
provided to the path to prevent migration of stone sideways into the surrounding
embankment, where hard edges of the defence wall aren’t present tannalised timber edgings
should be used.
The existing north bank wall along Ravenswell Road is to be investigated and assessed for
stability with the proposed new river depth and profile. Where necessary this wall is to be
strengthened and underpinned to allow dredging of the river to the new profile but leave the
wall with appropriate factors of safety against failure under all foreseeable loading or
combined loading cases including but not limited to; rising river levels, overtopping flood
Page 12
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
waters, rapid draw-down of flood waters, surcharge loading from heavy goods vehicles on
Ravenswell Road and temporary localised excavations.
The Contractor must ensure that the works do not lead to the spreading of the noxious weeds
along the River Dargle. The Contractor’s attention is drawn to the Invasive Species Survey
contained in Appendix D however the Contractor’s must satisfy himself as to the accuracy of
this survey and allow in his costs for this survey to be repeated at intervals during the works
as recommended by his Ecologist and agreed by the Employer’s Representative.
The
Contractor shall comply with best practice guidelines, the guidance included in the Contract
Documents and the recommendation of his Ecologist in relation to working in such an
environment. All such costs are deemed to be included in the Contractor’s Tender.
Care to be taken to protect the existing sewer pipes within the river bed with deepening works
and formation of the low flow fisheries channel. It is possible that the existing sewer may
require a reinforced concrete protection slab instead of plain concrete protection or possibly
require diverting to a lower level. Existing access chambers are to be retained and are to be
suitably protected with concrete surround or similar where exposed as a result of the
proposed widening and deepening work. Where the ground levels in the vicinity of existing
chambers are being altered the levels of the chambers will be amended accordingly and the
chambers covers amended to ensure that water ingress from the river does not occur.
Finished levels of all access chambers are to be agreed with the Employer’s Representative.
Where landowners currently have access to the river the Contractor shall incorporate access
on a like-for-like basis in his flood defence design where feasible and safe to do so. The
Contractors attention is drawn the An Bord Pleanala approval in relation to the CPO and
contained in Volume D.
2.2.2
Area 2 – Bray Bridge
The Contractor’s attention is drawn to the requirement that the works in AREA 2 must be
prioritised and that the defence works immediately adjacent to Bray Bridge must the designed
and constructed the flood in the first summer season on site (May to September). It is the
Contractor’s decision whether he will undertake the required structural works to Bray Bridge
at this time or during the second summer season on site. However the Contractor shall note
that the construction of proposed pedestrian bridges adjacent to Bray Bridge will be
undertaken between the two summer seasons (i.e. October to April). Design drawings for
these works are included in Volume D of these Contract Documents and further details are
provided under Section 3 of these Works Requirements. Furthermore the Contractor shall
only programme for undertaking works in AREA 2 or AREA 2A during the first summer
season (May – September) or from the second summer season to Contract end.
Page 13
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
In addition to the design and construction of new stone clad flood defence walls to
accommodate the required flood defence levels the Contractor will also be responsible for the
design and construction of the structural works required to maintain the structural integrity of
Bray Bridge as a result of the river regrading works. The Contractor’s attention is drawn to
the fact that the closure of Bray Bridge is not permitted at any stage of the works.
River regarding works in the vicinity of Bray Bridge will require the Contractor to undertake
extensive underpinning and other work structural works to ensure that the structural integrity
of the bridge is unaffected. The Contractor must submit detailed design proposals for these
works demonstrating that the proposed works can be carried out without risk to the safety and
integrity of the bridge. Extreme care shall be exercised during underpinning works at Bray
Bridge so as not to damage the existing structure or fabric.
The Contractor shall include for all costs associated with the diversion and protection of
services and shall ensure that his programme takes account of working all third parties and
their associated services.
Services drawings are provided with in the information pack.
These drawings are for information only and it is the Contractor’s responsibility to satisfy
himself as to the accuracy and completeness of these records. As stated in the EIS the
existing arch under Ravenswell Road will be incorporated into the aesthetic finish of the flood
defence wall. The facing to both elevations of the arch will filled in with natural stone to match
existing surrounding masonry. This work, filling in the archway, must be completed without
regard to whether the culvert works are proceeding. This work must be incorporated into the
Contractor’s design of the flood defences structures in this area.
The Contractor must ensure that the works do not lead to the spreading of the noxious weeds
along the River Dargle. The Contractor’s attention is drawn to the Invasive Species Survey
contained in Appendix D however the Contractor’s must satisfy himself as to the accuracy of
this survey and allow in his costs for this survey to be repeated at intervals during the works
as recommended by his Ecologist and agreed by the Employer’s Representative.
The
Contractor shall comply with best practice guidelines, the guidance included in the Contract
Documents and the recommendation of his Ecologist in relation to working in such an
environment. All such costs are deemed to be included in the Contractor’s Tender.
Care must be taken to protect the existing sewer pipes within the river bed with deepening
works and formation of the low flow fisheries channel. It is possible that the existing sewer
may require a reinforced concrete protection slab instead of plain concrete protection or
possibly require diverting to a lower level. Existing access chambers are to be retained and
are to be suitably protected with concrete surround or similar where exposed as a result of the
proposed widening and deepening work. Where the ground levels in the vicinity of existing
chambers are being altered the levels of the chambers will be amended accordingly and the
Page 14
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
chambers covers amended to ensure that water ingress from the river does not occur.
Finished levels of all access chambers are to be agreed with the Employer’s Representative.
Where landowners currently have access to the river the Contractor shall incorporate access
on a like-for-like basis in his flood defence design where feasible and safe to do so. The
Contractors attention is drawn the An Bord Pleanala approval in relation to the CPO and
contained in Volume D.
2.2.3
Area 2A – Culvert Option at Bray Bridge
The Contractor shall note that the works outlined here may not proceed to construction under
this contract. The Contractor is required to include the works as part of his tender providing a
design and costing of the works but the Employer will confirm, prior to contract signing,
whether or not these works will be undertaken as part of this contract.
The works in this area will include the design and construction of a 7.5m x 4.0m box culvert
on the northern side of Bray Bridge including the diversion and protection of any services
required by the design of these works. The proposed culvert shall have straight internal walls
and tie-in to the existing river walls with a smooth transmission, the opening shall be free from
obstructions with clear internal dimensions of 7.4m wide x 4m deep culvert at all times
including at the angle at which the culvert intercepts the existing walls. The opening in the
existing wall created by the culvert shall be finished with natural stone cladding to match
exiting, where possible existing river wall stones shall be reused.
The works to install the culvert will involve significant works in relation to diversion of services.
The Contractor is responsible for all costs associated with all and any works associated with
services and the diversion and/or protection of same. The Contractor shall include for all
costs associated with such works and shall ensure that his programme takes account of
working all third parties and their associated services. Services drawings are provided with in
the information pack. These drawings are for information only and it is the Contractor’s
responsibility to satisfy himself as to the accuracy and completeness of these records. The
installation of the proposed culvert will require that an existing stone arch under Ravenswell
Road, adjacent to Bray Bridge, is blocked up.
As stated in the EIS the arch will be
incorporated into the aesthetic finish of the flood defence wall with the facing to both
elevations of the filled in arch to be in natural stone to match existing surrounding masonry.
The Contractor must ensure that the works do not lead to the spreading of the noxious weeds
along the River Dargle. The Contractor’s attention is drawn to the Invasive Species Survey
contained in Appendix D however the Contractor’s must satisfy himself as to the accuracy of
this survey and allow in his costs for this survey to be repeated at intervals during the works
as recommended by his Ecologist and agreed by the Employer’s Representative.
The
Page 15
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
Contractor shall comply with best practice guidelines, the guidance included in the Contract
Documents and the recommendation of his Ecologist in relation to working in such an
environment. All such costs are deemed to be included in the Contractor’s Tender.
Care must be taken to protect the existing sewer pipes within the river bed with deepening
works and formation of the low flow fisheries channel. It is possible that the existing sewer
may require a reinforced concrete protection slab instead of plain concrete protection or
possibly require diverting to a lower level. Existing access chambers are to be retained and
are to be suitably protected with concrete surround or similar where exposed as a result of the
proposed widening and deepening work. Where the ground levels in the vicinity of existing
chambers are being altered the levels of the chambers will be amended accordingly and the
chambers covers amended to ensure that water ingress from the river does not occur.
Finished levels of all access chambers are to be agreed with the Employer’s Representative.
Where landowners currently have access to the river the Contractor shall incorporate access
on a like-for-like basis in his flood defence design where feasible and safe to do so. The
Contractors attention is drawn the An Bord Pleanala approval in relation to the CPO and
contained in Volume D.
2.2.4
Area 3 – Bray Bridge to the western edge of People’s Park
The works in this area comprise of the construction of stone clad flood defence walls,
structural embankments and any other necessary works to accommodate the required flood
defence level.
The works will also entail widening and regrading of the river bed.
As
indicated on the specimen design the works in Area 3 also entail the excavation of a large
section of People’s Park between the junction with St Laurence’s Terrace and Bray Bridge.
This area of People’s Park will be incorporated into the river channel. A pedestrian boardwalk
cantilevered off the new proposed flood wall will be provided in this area. Drawing B237-165
of the specimen drawings provides an outline graphical representation of the expected
aesthetic finish of the boardwalk. The walkway shall be tied into the existing ground level at
People’s Park and at Bray Bridge.
The required flood defence wall level shall not be
compromised by the boardwalk at the point where the boardwalk passes over the defence to
the dry side. The Contractor is responsible for the detailed design of the boardwalk ensuring
that it compiles with the performance specification and all relevant design standards.
The works in Area 3 also involve the diversion of 900 mm sewer that crosses the river at
People’s Park in the vicinity of the Swan Stream. Currently the sewer crosses from the
northern bank to the southern bank of the river upstream of the Swan Stream. Following the
completion of flood defence works the pipe will be significantly proud of the new river bed
level, therefore it is proposed to divert the sewer as shown on drawings Y9114–C–105. The
Contractor is responsible for the detailed design of the sewer; the drawings provided are for
Page 16
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
information purposes. The Contractor must incorporate this sewer as part of his detailed
design for the scheme ensuring that the overall capacity of the flood channel is not reduced
by the inclusion of this sewer. It is noted that it may be necessary for this pipe to partially
exposed as it runs parallel to the flood defence and the Contractor must adequate protect the
pipe if this is the solution the Contractor proposed.
The sewer diversion must also be
designed to prevent any ingress of water into the sewer.
The Contractor must ensure that the works do not lead to the spreading of the noxious weeds
along the River Dargle. The Contractor’s attention is drawn to the Invasive Species Survey
contained in Appendix D however the Contractor’s must satisfy himself as to the accuracy of
this survey and allow in his costs for this survey to be repeated at intervals during the works
as recommended by his Ecologist and agreed by the Employer’s Representative.
The
Contractor shall comply with best practice guidelines, the guidance included in the Contract
Documents and the recommendation of his Ecologist in relation to working in such an
environment. All such costs are deemed to be included in the Contractor’s Tender.
Care must be taken to protect the existing sewer pipes within the river bed with deepening
works and formation of the low flow fisheries channel. It is possible that the existing sewer
may require a reinforced concrete protection slab instead of plain concrete protection or
possibly require diverting to a lower level. Existing access chambers are to be retained and
are to be suitably protected with concrete surround or similar where exposed as a result of the
proposed widening and deepening work. Where the ground levels in the vicinity of existing
chambers are being altered the levels of the chambers will be amended accordingly and the
chambers covers amended to ensure that water ingress from the river does not occur.
Finished levels of all access chambers are to be agreed with the Employer’s Representative.
Where landowners currently have access to the river the Contractor shall incorporate access
on a like-for-like basis in his flood defence design where feasible and safe to do so. The
Contractors attention is drawn the An Bord Pleanala approval in relation to the CPO and
contained in Volume D.
2.2.5
Area 4 – Western edge of People’s Park to La Vallee
In addition to the construction of stone clad flood defence walls, structural embankments and
any other necessary works to accommodate the required flood defence level and widening
and regrading of the river bed, the works in Area 4 will entail the construction of a culvert
approx 1.2m x 1.0m to carry the County Brook through the embankment proposed in this
location.
The culvert shall have a similar invert to the existing brook and have suitable
headwalls at each end to allow the brook to pass through the new embankment without
erosion or scouring of the embankment. The exact size and design requirements for this
culvert must be agreed with Inland Fisheries Ireland and will be such as to not impede any
Page 17
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
fish spawning potential that currently exists on the County Brook. The design of this element
of the works shall allow for the required fish passage to maintain the spawning potential of the
stream, as directed by Inland Fisheries Ireland, as well as incorporating measures to prevent
flood waters back flowing from the River Dargle up the County Brook and causing flooding
behind the flood defences.
Area 4 also includes a debris trap consisting of elliptical concrete piers. The propose of the
debris trap is to trap large debris and prevent it from travelling further downstream and
causing blockages in more populated and congested areas. The Contractor is responsible for
the detailed design of the debris trap including the proposed secondary flow channel that will
be provided at the Slang to cater for flows in the event that the debris screen becomes
blocked. In this event the Contract shall ensure that there is still sufficient capacity in the river
to main the required flood defence level. A lower embankment at the debris trap is to be
provided to separate the main channel and secondary channel as shown on the drawings.
The crest level of the lower embankment is to be 300 mm above design flood level.
The contractor shall ensure that any existing defences that are to be retained as part of his
design shall meet the requirements of the performance specification and any other relevant
applicable design standards. He will carry out any necessary strengthening and repair works
that are required to ensure that the works as a whole have the required design life and
provided the required flood defence. Existing flood defence walls are to be inspected and
appropriate strengthening works/ underpinning works carried out where the new river profile
will compromise their integrity. Damaged or poor condition existing gabion baskets are to be
repaired and refilled with a quality of materials and stone to match the existing undamaged
and good condition baskets.
The works in Area 4 also involve the regrading of a large portion of land at the Slang. The
area in question is colloquially known as Rehills Lands. It is proposed to raise the level in this
area by approximately a 1m by spreading suitable excavated material over the lands.
Suitable environmental testing of the excavated material will be undertaken prior to placement
to confirm suitability. In addition the Contractor must ensure that such works do not lead to
the spreading of the noxious weeds. The Contractor’s attention is drawn to the Invasive
Species Survey contained in Appendix D however the Contractor’s must satisfy himself as to
the accuracy of this survey and allow in his costs for this survey to be repeated at intervals
during the works as recommended by his Ecologist and agreed by the Employer’s
Representative.
The Contractor shall comply with best practice guidelines, the guidance
included in the Contract Documents and the recommendation of his Ecologist in relation to
working in such an environment. All such costs are deemed to be included in the Contractor’s
Tender.
Page 18
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
Care must be taken to protect the existing sewer pipes within the river bed with deepening
works and formation of the low flow fisheries channel. It is possible that the existing sewer
may require a reinforced concrete protection slab instead of plain concrete protection or
possibly require diverting to a lower level. Existing access chambers are to be retained and
are to be suitably protected with concrete surround or similar where exposed as a result of the
proposed widening and deepening work. Where the ground levels in the vicinity of existing
chambers are being altered the levels of the chambers will be amended accordingly and the
chambers covers amended to ensure that water ingress from the river does not occur.
Finished levels of all access chambers are to be agreed with the Employer’s Representative.
Where landowners currently have access to the river the Contractor shall incorporate access
on a like-for-like basis in his flood defence design where feasible and safe to do so. The
Contractors attention is drawn the An Bord Pleanala approval in relation to the CPO and
contained in Volume D.
2.2.6
Area 5 – La Vallee to N11 Bridge
The works in this area involve widening, deepening and regrading the river channel, bank
stabilisation and strengthening works to suit the proposed new river profile as well as
strengthening / underpinning of existing defence structures. At several places the outline
proposals involve deepening the river adjacent to existing river walls and defence structure.
At these locations the existing feature is to be investigated and assessed for stability with the
proposed new river depth and profile. Where necessary the existing defence feature is to be
strengthened and /or underpinned to allow dredging of the river to the new profile but leave
the wall/river feature with appropriate factors of safety against failure under all foreseeable
loading or combined loading cases including but not limited to; rising river levels, rapid drawdown of flood waters and temporary localised excavations.
The Contractor must ensure that the works do not lead to the spreading of the noxious weeds
along the River Dargle. The Contractor’s attention is drawn to the Invasive Species Survey
contained in Appendix D however the Contractor’s must satisfy himself as to the accuracy of
this survey and allow in his costs for this survey to be repeated at intervals during the works
as recommended by his Ecologist and agreed by the Employer’s Representative.
The
Contractor shall comply with best practice guidelines, the guidance included in the Contract
Documents and the recommendation of his Ecologist in relation to working in such an
environment. All such costs are deemed to be included in the Contractor’s Tender.
Care must be taken to protect the existing sewer pipes within the river bed with deepening
works and formation of the low flow fisheries channel. It is possible that the existing sewer
may require a reinforced concrete protection slab instead of plain concrete protection or
possibly require diverting to a lower level. Existing access chambers are to be retained and
Page 19
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
are to be suitably protected with concrete surround or similar where exposed as a result of the
proposed widening and deepening work. Where the ground levels in the vicinity of existing
chambers are being altered the levels of the chambers will be amended accordingly and the
chambers covers amended to ensure that water ingress from the river does not occur.
Finished levels of all access chambers are to be agreed with the Employer’s Representative.
Where landowners currently have access to the river the Contractor shall incorporate access
on a like-for-like basis in his flood defence design where feasible and safe to do so. The
Contractors attention is drawn the An Bord Pleanala approval in relation to the CPO and
contained in Volume D.
2.2
Fishery Zones
2.2.1
General
The performance specification outlined below in relation to the requirements of Inland
Fisheries Ireland is an outline specification only. It is the Contractor’s responsibility to liaise
with IFI as specified in Section 3.1 and determine the exact requirements and conditions of
work and incorporate all such requirements in the design submission. Again the Contractor
should note that the fishery ZONES refer to different sections of the works to the works
AREAS defined above.
Before commencing works the Contractor must undertake a survey of the existing river bed to
establish such things as the existing bed slope, the riffle & glide locations and locations of
existing boulders and stilling ponds. The Contractor shall liaise with IFI regarding the scope
of this survey as in general the purpose of the survey is to record information on the existing
channel to allow it to reinstated as per existing insofar as possible.
2.2.2
Zone 1 – N11 Bridge to downstream end of La Vallee
There appears to be insufficient space to construct a stepped channel in this area however
the Contractor shall undertake a survey to confirm the exact width of the channel. If there is
insufficient space the final channel will be the same width as the existing channel, approx
3.5m – 4.0m. If the survey demonstrates that there is sufficient space in the opinion of IFI for
a stepped then the wetted area/low flow channel will be 3.5m – 4.0m. The step in the channel
can be as minimal as 250 mm but greater would be preferred. The Contractor will agree this
dimension with IFI however his design must allow adequate flood capacity in the river. The
Contractor’s design will be to return the riverbed to the existing slopes, incorporating the riffle
and glide and replacing the boulders at the same depth and location insofar as possible at the
lower design bed level.
2.2.3
Zone 2 – Downstream end of La Vallee to the downstream end of The Slang
Page 20
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
Along the Slang there is sufficient area to provide a two stage/stepped channel. The wetted
area/low flow channel will be the same dimensions as that of Zone 1 but will tie into the
existing bed width in Zone 3, approx 4m – 4.5m. The low flow channel will be maintained
tight to the northern bank insofar as possible along the length of the Slang. The step in the
channel can be as minimal as 250 mm but greater would be preferred. The Contractor will
agree this dimension with IFI however his design must allow adequate flood capacity in the
river.
The Contractor’s design will be to return the riverbed to the existing slopes,
incorporating the riffle and glide and replacing the boulders at the same depth and location
insofar as possible at the lower design bed level.
2.2.4
Zone 3 – Downstream End of the Slang to Upstream End of People’s Park
Similar to Zone 1 it appears that there is insufficient space to construct a stepped channel in
this area. If there is insufficient space the final channel will be the same width as the existing
channel, approx 4m – 4.5m. If the survey demonstrates that there is sufficient space in the
opinion of IFI for a stepped then the wetted area/low flow channel will be 3.5m – 4.0m. The
step in the channel can be as minimal as 250 mm but greater would be preferred. The
Contractor will agree this dimension with IFI however his design must allow adequate flood
capacity in the river The Contractor’s design will be to return the riverbed to the existing
slopes, incorporating the riffle and glide and replacing the boulders at the same depth and
location insofar as possible at the lower design bed level. The design of the culvert to carry
the County Brook shall accommodate the required fish passage to maintain the spawning
potential of the stream, as directed by Inland Fisheries Ireland, as well as incorporating
measures to prevent flood waters back flowing from the River Dargle up the County Brook
and causing flooding behind the flood defences.
2.2.5
Zone 4 – Upstream End of People’s Park to Bray Bridge
A two stage channel is required in this zone. The width of the low flow channel will be
approximately 1m narrower than the current wetted area, thus having a width of approx 3.5m
– 4m. However the low flow channel will be centrally located within the width of the river in
this location. There is also a requirement to introduce deflectors along the length of Zone 4.
These will be at approx 20m centres.
They will consist of boulders approx 0.5m – 1m
diameter with approx 30T of stone for each deflector.
Page 21
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
SECTION 3 – THIRD PARTY CONSENTS AND INTERFACES
3.1
Works in a Water Course
The River Dargle is a spawning ground for various aquatic species including salmon and
trout. Therefore the Contractor must liaise with Inland Fisheries Ireland (IFI) prior to and
during both design and construction.
The Contractors design must accommodate the
requirements of IFI with regards to the protection of the aquatic environment as well as the
necessary measures and design requirements for the sustainability of the aquatic
environment and all associated habitats. No works, including site setup and site clearance,
will be permitted without the prior approval of IFI. The Contractor must allow in his tender for
all costs associated with this work including liaison with IFI and the design and construction of
all permanent and temporary measures required by IFI. The Contractor must also allow
sufficient time in his programme to undertake the necessary liaison and works to satisfy the
requirements of the IFI. The Employer’s Representative must be informed of all designs,
requirements and agreements. Further details of the requirements of IFI are provided in other
section of the works requirements.
3.2
Planning Consent
The Environmental Impact Statement (EIS) scheme has been approved by An Bord Pleanála.
The Contractor is required to construct the works in accordance with the restrictions set out in
the EIS and all other restrictions or clarifications contained in the Contract Documents. The
Contractor is responsible for the detailed design of the works and should note that material
contraventions must be submitted for approval to the local planning authority. The local
planning authority does not guarantee that any such contraventions or amendments to the
existing planning will be approved.
3.3
Possession of the Site
The Employer has secured by compulsory purchase the lands as outlined on the Compulsory
Purchase Order (CPO) drawings included with these Contract Documents. The Contractor
shall be allowed possession of the site in accordance with Section 7 of the Conditions of
Contract and in a manner appropriate to his approved programme and method of working,
and shall take account of any traffic, environmental or other working restrictions or
requirements, as detailed in these Works Requirements. The Contractor must ensure that the
Works are designed and constructed within the limit of these lands.
The Contractor’s
attention is drawn to the phased completion of the works and the requirements for the
completion of each phase prior to the commencement of the next phase.
3.4
Landowners
Detailed negotiations have been undertaken as part of the compulsory purchase order (CPO)
process for the project.
The landowners affected by this process have been consulted
throughout the development of the scheme, with the detailed proposals often being the
Page 22
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
subject of close scrutiny by the affected landowners. The Employer will provide a list of all the
landowners who have been subject to the CPO process as well as any other landowner
information that is known. It is the Contractor’s responsibility to assess this information and
satisfy himself as to the accuracy of this information. The Contractor will be responsible for
negotiating access and compensation to any lands specifically required as a result of his
specific design or method of construction that is outside the CPO boundary.
The Contractor shall play a proactive role in maintaining landowner liaison and as discussed
in other areas of the Works Requirements the Contractor must appoint a Public Liaison
Officer who will undertake this role specifically. The Contractor shall promptly inform the
Employer’s Representative of any specific queries or concerns on the part of the landowners,
land occupiers, or their agents. The Contractor shall negotiate access and working methods
with the appropriate landowners and shall keep residents and tenants informed of the
programme and implications. The Contractor’s attention is specifically drawn to the security
of third party sites which shall not be compromised during, or as a result of, the Works. The
Contractor shall note that no construction activities will be permitted until security fencing has
been erected. The Contractor shall include the costs of all third party liaison works including
negotiations for access and accommodation works in his tender.
The Contractor shall take every precaution to ensure that his employees do not trespass or
cause nuisance to any lands outside the site. Trespass of any kind will be regarded as a
serious offence and may lead to a request by the Employer for the removal of the offending
work-person from the Site.
3.5
3.5.1
Interfaces with Other Construction Contracts
General
It is expected that there will be other public construction contracts on site in the vicinity of the
flood defences works during the same time period that these works are being undertaken. The
Contractor is expected to liaise with the Contractors undertaking these works and develop
accommodating methods of works so as to minimise insofar as possible disruption to either
contract. Details of three other possible construction contracts are provided below but this is a
non-exhaustive list and the Contractor may be required to accommodate other contracts.
3.5.2
Bray Shanganagh Pipelines and Stormtank
It is proposed to construct two new pipelines under the bed of the river from Bray Pumping
Station, adjacent to the DART Bridge in Bray Harbour, to connect to the new Bray
Shanganagh Treatment Plant. Design drawings for these pipelines are included in Volume D
of these Contract Documents. However the Contractor is expected to liaise with the both the
designers and the Contractors for these works to ensure that the design of the flood defence
works accounts for these pipelines.
The Contractor is also expected to develop
Page 23
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
accommodating methods of works so as to minimise insofar as possible disruption to either
contract. The Employers Representative will provide the Contractor with the relevant contact
details.
In addition it is proposed to construct a new storm tank in the golf course lands. While the
location of the proposed storm tank should not impact on the design or construction of the
flood defence works the Contractor must familiarise himself with the scope of these works as
his method statements and traffic management plans must accommodate the safe ingress
and egress of construction traffic associated with these works. The Contractor is required to
agree any traffic management arrangements with the contractor undertaking these works.
Following the completion of the storm tank construction the Contractor must liaise with Dun
Laoghaire Rathdown County Council (DLRCC) regarding access for operation and
maintenance. The Contractor must comply with these requirements. Design drawings for
these works are included in Volume D of these Contract Documents.
The Employers
Representative will provide the Contractor with the relevant contact details
3.5.3
Widening Works to Bray Bridge
It is proposed to construct new pedestrian walkways on both sides of Bray Bridge to allow for
removal of the current footpaths and the inclusion bus lanes in the roadway over Bray Bridge.
The proposed design includes for abutments to be constructed adjacent to the current bridge
abutments. Design drawings for these works are included in Volume D of these Contract
Documents.
The Contractor is expected to liaise with the both the designers and the
Contractors for these works and develop accommodating methods of works so as to minimise
insofar as possible disruption to either contract. The Employers Representative will provide
the Contractor with the relevant contact details. This work is currently programmed to be on
site between the two summer seasons available to the Flood Defence Contractor. Therefore
the Flood Defence Contractor shall not programme for undertaking works in Area 2 or Area
2A outside of the summer season (May – September) or until after the second summer
season (October to Contract end).
3.6
Third Party Agreements & Notifications
The Contractor is required to liaise with all parties affected by the works prior to and during
both the design and the construction period as detailed in these Works Requirements. The
Contractor shall include the cost of all such liaison and all resultant requirements/agreements
in his tender. The Contractor will be responsible for all the costs associated with securing the
necessary permits required to undertake the works. The Contractor shall allow sufficient time
in his programme to obtain such licences including requirements for public liaison and
advertisement. The Contractor is responsible for compliance with any restrictions than may
be imposed as part of the granting of any permit.
All such costs will be borne by the
Contractor.
Page 24
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
The Contractor shall liaise with the following third parties prior to commencing the Works and
to agree with these parties the methods of working and programme.
This consultation
process is mandatory. Consultations shall include, but are not limited to the following (Please
note that this list is not exhaustive and does not relieve the Contractor from his statutory
duties):
Authority
1.
Traffic and Roads
Bray Town Council, Wicklow County Council,
Gardai
2.
Water Supply
Bray Town Council
3.
Foul and Storm Sewers
Bray Town Council
4.
Electricity
Electricity Supply Board
5.
Telecoms
Eircom, UPC, BT, etc
6.
Gas Supply
Bord Gais
7.
Works in and in the vicinity of a Water
Course , Water Quality, Fish, etc
Inland Fisheries Ireland
8.
Works in Vicinity of DART Bridge at
Bray Harbour
Iarnroid Eireann
9.
Works in the Golf Course
Pizzarro Developments
10.
Works in Vicinity of Bray Bridge
Bray Town Council, Gardai
11.
Aquatic Ecology
Inland Fisheries Ireland
12.
Terrestrial Ecology
National Parks & Wildlife Service
13.
Archaeology
National Monuments Service
14
Public Transport
Dublin Bus, Iarnroid Eireann, Finnegan
Buses, etc
3.7
Statutory Undertakers
The locations of Statutory Undertakers apparatus have been illustratively shown on the
drawings contained in these Contract Documents. These locations have been taken from the
information supplied by the relevant Statutory Undertakers and have been indicated only
where they are located within or adjacent to the working areas and may not be exhaustive.
The Employer takes no responsibility for the accurateness of the information shown on these
drawings. It is the Contractors responsibility to satisfy himself, by whatever means he deems
necessary, as to the location and extent of such items and to account for such things in the
design and construction of the works. It is the Contractor’s responsibility to identify if any
Page 25
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
diversions are required for the works and to include in his tender all and any cost associated
with such works. The programme for the works should also take account of the time period
for such works.
Page 26
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
SECTION 4 – RESTRICTIONS AND OBLIGATIONS
4.1
Phasing and Programme
No in-stream works are permitted except from the 1st May to the 30th September or as agreed
with Inland Fisheries Ireland. The Contractor shall not programme for undertaking works in
Area 2 or Area 2A outside of the summer season (May – September) or until after the second
summer season (October to Contract end).
The Contractor must commence construction from the upstream end of the works and
progress the works towards the downstream end. The Works are divided into five distinct
areas and the Contractor must complete the works in one area insofar as is practical prior to
commencing works in the next area. The extent to which the works must be completed prior
to moving to the next area will be agreed on a case by case basis with the Employer’s
Representative. However for the purposes of programming and cash flow the Contractor
should assume that all works in one area must be complete prior to work commencing in the
next area. Any assumptions made to the contrary are at the Contractors own risk.
The programme shall be developed so as not to worsen the flood protection level of service at
any location upstream or downstream of the Works. Excavation and widening works within
the river channel shall be undertaken prior to construction of defences in any stretch of the
river.
4.2
Notice of Construction Activities
The Contractor is required to provide a minimum of six weeks notice of the date at which the
Contractor intends to commence construction to all third parties affected by the works.
However it is Contractors responsibility to research and comply with any statutory notification
periods that may be required for the Works. In addition the Contractor shall comply with any
restrictions regarding landowner notifications as required by the Employer
4.3
Working Hours
Normal working hours shall be 0800 and 1800 Monday to Friday and 0800 and 1300 on
Saturdays. No work shall be executed outside normal working hours, on Sundays or Public
Holidays without the prior written acceptance of the Employer’s Representative.
Such
acceptance will be influenced by the time of sunset/sunrise, anticipated noise, odour and
artificial light emissions from the Works, use of public roads and any other considerations that
could cause disturbance to members of the public.
However in relation to sections of the works which impact on traffic working hours where lane
closures are not required are 7am to 7pm Monday to Friday and 7am to 1pm on Saturdays.
Working hours where lane closures are required (Castle Street) are 8pm to 7am Monday to
Thursday and 8pm Friday to 11am Saturday. However written approval for these works must
Page 27
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
be obtained from the Employer’s Representative. This approval will be forthcoming provided
that the Contractor can demonstrate that all relevant stakeholders have been informed and
there are no outstanding objections to the works. The Contractor shall ensure that the issue
of working hours is addressed in construction stage traffic management plan.
4.4
Site Limits
The limts of Works Area availible to the Contractor for the construction of the works is outlined
on the specimen drawings and the area of land secured under the CPO process is shown on
the CPO drawings, both sets of drawings are contained in Appendix D of the Contract
Documents. The Lands, Rights of Way and Wayleaves acquired for the Works will be handed
over to the Contractor as soon as possible after the Instruction to Commence has been
issued.
If the Contractors design requires land outside of that shown on the CPO drawings and in the
possession of the Employer, the Contractor will be fully responsible for all the costs
associated with acquiring the land and as well as negotiating and agreeing such items with
any affected landowners. Where the Contractor negotiates such agreements he must keep
the Employer and Employer’s Representative up-to-date with proceedings and the details of
such agreements.
However neither the Employer nor Employer’s Representative will
participate in the negotiation process.
The Contractor will be responsible for putting in place any legal agreement for lands outside
of the CPO which will contain permanent works, will be sterlised by the permanent works or
will required for access for maintainence. However such agreements are subject to approval
by the Employer. The Contractor must take account of any recommendations or otherwise
made by the Employer in relation to such agreements. The Contractor is responsible for
discharging all costs associated with such agreements. The Contractor shall ensure that the
title of any lands acquired or easements agreed in this manner will be transferred to the
Employer.
The Contractor shall make his own arrangements with and make all payments to the owners
and occupiers for the use of any additional land outside the limits of the easements and
Working Areas, which he may require for the purpose of the Contract, including land for
temporary storage of materials, topsoil dumps, site accommodation etc. The Employer’s
Representative shall be notified of the details of any such arrangements made.
The Contractor shall keep records of the dates of his entry onto and departure from all
property and land of each owner and occupier, together with the dates of the erection and
removal of all enclosures, and shall furnish copies of these records when required by the
Employer’s Representative. He shall keep and furnish copies of similar records in respect of
Page 28
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
roads, footpaths and thoroughfares.
Date: October 2010
Project No: Y9114
The Contractor shall maintain photographic records
taken before, during and after works are carried out within privately owned property.
The Contractor will be deemed to have satisfied himself as to the conditions of access onto,
across, and egress from the various Sites. Such arrangements are to be agreed at least two
weeks in advance of that section of work commencing with the owner/ occupier of the land
and no claim for extra payment arising out of any difficulties in this respect will be allowed.
The Contractor shall maintain the access roads at all times to the satisfaction of the
Employer’s Representative.
Where the Works interfere with existing access routes,
temporary accesses shall be provided across the working width at suitable locations agreed
with owners/occupiers.
The Contractor shall take every precaution to ensure that his employees do not trespass or
cause nuisance to any lands outside the site. Trespass of any kind will be regarded as a
serious offence and may lead to a request by the Employer for the removal of the offending
work-person from the Site.
The following Condition is deemed to be incorporated in the Contract:
“The Contractor acknowledges and agrees that insofar as planning permission or other
consents or permits may be required to be obtained by the Contractor in relation to his
specific proposals for the carrying out and completion of the Works that the Contractor shall
be responsible for obtaining, at his own cost, such permission, consents or permits. Further,
the Contractor acknowledges and agrees that he shall not be entitled, notwithstanding any
other provision of the Contract, to any extension of time for the completion of the Works or to
any compensation or payment by reasons of any necessity to obtain or delay in obtaining any
such planning or other consents or permits”
4.5
Flood Events
The Contractor’s proposed methods of construction must take account of the Flood
Management Plan that is currently active in Bray Town and is included in Volume D of the
Contract Documents.
To ensure flood protection is available the Contractor shall have procedures in place and
agreed with the Employer before any works can take place. The procedures will ensure
availability of critical personnel from the Contractor 24hrs a day and any day for the duration
of the Works. The likelihood of a flood event occurring during construction is the same as in
any other year.
Although existing defences will be removed and replaced with new
structures, the contractor must ensure that the risk of flooding is not increased during the
works. This will impact upon the appointed contractor’s phasing of the works as areas of Bray
Page 29
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
cannot be left undefended. If necessary the contractor will have emergency procedures in
place to reinstate defences if required by the onset of a flood emergency.
The contractor must ensure that all possible precautions are taken in the setting up of the site
compounds so that the risk of materials or debris being washed away and causing damage
during a flood event is minimised.
Although the river is a spate river and as such little
advance warning of flood events is possible, the contractor must monitor both long and short
term weather forecasts so that machinery and personnel can be prevented from entering the
river during times of high rainfall and high tide events. Monitoring of the flow in the upstream
catchment may be used as an aid to predict high flow events. No machinery shall be left in
the river overnight or outside of normal working hours.
The Contractor shall not carry out any works which will lead to a deterioration of the flood
defence standard without the prior acceptance of the Employer’s Representative.
Such
acceptance will only be granted in exceptional circumstances and only for short periods in
controlled conditions. Any temporary lowering of the flood defence shall be capable of being
reinstated by the Contractor within six hours of a flood warning.
4.6
Advanced Weather Warning System
The Contractor is required to provide an Advanced Weather Warning System for the duration
the Works. Such a system shall be designed to provide adequate response time to prepare
for flash floods or similar adverse conditions that may pose health and safety risks to those
carrying out these works, as well as risks to the working environs and to the public in general.
This system may include subscriptions to meteorological services, a system to monitor the
saturation levels of the upstream catchments and any other service(s) which may supply
relevant predictive information with regard to the flows in the River Dargle. The Contractor is
required to submit details of the proposed system to the Employer’s Representative for review
prior to the commencement of the works.
4.7
Project Liaison Officer
The Contractor shall employ a Project Liaison Officer (PLO) who shall be responsible for
keeping the public informed on all aspects of the works. The PLO will be the sole point of
contact for all landowners and no other member of the Contractor’s staff shall contact
landowners regarding the Works unless specifically agreed with the landowner.
The
Employer’s Representative shall be informed of all landowner issues and discussions. The
PLO shall be available at all reasonable times to respond to complaints and comments from
members of the public and from public and private enterprises affected by the Works.
The PLO shall also supervise and manage the following activities:
Page 30
Client:
Project Title:

Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
Set up a project specific website, that will be linked to the Bray Town Council website,
providing
information
on
the
proposed
scheme
including
the
proposed
design/construction works, works progress, appropriate contact details and any other
relevant information as agreed with the Employer’s Representative.

Update the website and distribute leaflets on a monthly basis with information on the
works that were completed in the previous month, works that are ongoing, works that
will be undertaken in the coming months and traffic management arrangements.

Provide up-to-date details on the website of traffic management arrangements on
daily basis or as appropriate when the traffic management arrangements change.

Provide traffic updates and information on disruptions to local radio/press as well as
national associations such as AA Roadwatch on daily basis.

Issue flyers informing the public of the existence of the website, providing a brief
outline of the works and providing details of the PLO contact details (telephone and
email) as well as details of the Employers Representative. Repeat this exercise at
least every 3 months.

Attendance at Client and/or Town Council Meetings as required by the Client for the
during of the works.
All public relations documentation, including updates to the proposed website must be agreed
with the Employer’s Representative prior to publication.
4.8
Communications Plan
The Contractor shall maintain a communication plan for each scheme with details of all
planned and actual communications with third parties relating to the scheme. This shall be
updated throughout the contract with significant changes highlighted in the progress reports.
Any leaflets or information notices issued by the Contractor to members of the public shall be
produced to the Employer’s standard format.
4.9
Prompt Attention to Complaints or Causes for Complaint
The Contractor shall take immediate steps to eliminate the source or cause of an event that
results in, or could result in, justifiable third party claims for compensation. The Employer’s
Representative shall be fully informed of any such complaint and of actions taken to eliminate
the cause of the complaint, or to mitigate the effects of the event.
4.10
Contract Notice Sign
The Contractor is responsible for the supply, maintenance, erection and dismantling of 3 No.
Public Information Boards and 3 No National Development Plan Boards for the entire duration
of the works, which are to be generally located at locations to be agreed on site with the
Employer’s Representative. The Public Information Boards shall be to an agreed detail, similar
to the typical detail shown on Drawing No. Y9114-C-106. The text and logos on the signs shall
Page 31
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
clearly visible / legible and the signs shall have a waterproof finish. These shall be erected prior
to work commencing on site and dismantled upon completion of the works. The signs shall be
stoved aluminium and be equipped with minimum of 2 rails, spaced to suit the gate post cross
bars, to permit fixing of the signs to the gate posts using appropriate aluminium fasteners to
provide a secure and vandal proof fixing detail.
4.11
Traffic Management
The Contractor’s attention is drawn to the Design Stage Traffic Management Plan contained
in Preliminary Health and Safety Plan in Volume D of the Contract Documents. It is the
responsibility of the Contractor to fully develop this outlined plan in conjunction with all the
relevant parties.
The Contractor shall comply with recommendations made by the Local
Authority on access routes, site access points, signage, highway cleaning, and making good
any damage to the highway. The Contractor shall submit details of their proposals for traffic
management and signing to the Employer’s Representative for their acceptance.
The Contractor shall ensure that access is possible along all roadways and footpaths at all
times, unless closure or disruption has been agreed in advance with the local authority and
other parties affected by the closure. Where delivery of materials is from adjacent roads, the
Contractor shall provide appropriate signs and traffic control in the form of stop/go boards or
traffic lights around any vehicles temporarily parked on the roads. The Contractor shall not
allow any vehicle, item of plant or similar to park on the public highway or verge whilst on
business connected with the Works excepting for delivery of materials or within the defined
working areas.
4.12
Temporary Fencing
The Contractor shall be responsible for the provision of all temporary fencing and gates to the
working areas, to ensure the protection of equipment, materials, operatives, as well as
prevention of vandalism, public hazard and disturbance to adjacent land/ vegetation to be
protected and retained. Temporary fencing and gates are to be agreed with landowners and
shall also be sufficient to discharge the Contractor’s obligations under the Contract and
Health and Safety legislation. Where existing or diverted footpaths pass alongside working
areas, the Contractor shall ensure that the footpath is adequately fenced off from all traffic
and construction activities. The Contractor shall provide all the necessary signs and barriers.
The fencing in public areas shall comply with the recommendations for “Works On or Adjacent
to Public Roads” or an equivalent standard. Suitable warning lights shall be erected at 25m
intervals along the fencing in/adjacent to public access ways during the hours of darkness.
These shall be maintained in proper working order to the entire satisfaction of the Employer’s
Representative.
Page 32
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
Temporary fencing to all working areas of the site shall be provided and maintained under this
contract. It shall be kept free of graffiti and bill posting. The fencing shall comply with current,
best practice recommendations for works on or adjacent to public roads. In private land, the
fencing shall be sufficient to prevent the access of livestock onto Working Areas and must be
to the prior approval of the Employer’s Representative.
Suitable warning lights shall be
erected at 50m intervals, or where the Employer’s Representative deems necessary, along
the protective barriers during the hours of darkness. These shall be maintained in proper
working condition to the entire satisfaction of the Employer’s Representative. Temporary
fencing and security gates around the site compound shall be erected and maintained for the
duration of the contract and dismantled upon completion.
Temporary tree protection measures shall be provided were necessary to prevent any
damage to trees that are to remain under the final scheme. As a minimum the locations,
extents and fencing specifications identified on the Specimen drawings and in section 5.7 of
the EIS shall be implemented in advance of construction operations to the satisfaction of the
Employer’s Representative.
4.13
Site Security
The Contractor is responsible for the security of the site, including any plant, equipment, stores
and offices. He shall include all such costs in his tender.
4.14
Progress Reports
The Contractor shall prepare monthly progress reports for the Employer’s Representative. An
electronic copy of each report shall be circulate to an agreed distribution list at least two days
prior the monthly site progress meeting. The report shall be provided to a format agreed with
the Employer’s Representative and shall include the following information:
(i)
Detailed reports of construction and design progress achieved
(ii)
Details of proposed work in the following month
(iii)
Details of drawings, designs and submissions to be submitted to the Employer’s
Representative for acceptance in the following month
(iv)
An updated programme
(v)
An updated payment / expenditure profile and out-turn cost estimate
(vi)
Details of significant changes to the communications plan
(vii)
Updated risk registers.
4.15
Progress Photographs
The Contractor shall provide a set of digital photographs on CD at monthly intervals to the
Employer’s Representative.
The positions and timing of the progress photographs shall
clearly indicate daily progress at all active sites. The CD shall be given to the Employer’s
Page 33
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
Representative at the monthly progress meeting or at any other time as reasonably
requested. Such photographs shall be deemed to be the property of the Employer (Bray
Town Council). The cost of such photography and the compilation of photos onto CDs should
be included in the Tender Total.
The Contractor shall arrange for an independent, professional, photographer to photograph the
progress of the work on a monthly basis. The number of photographs may be varied by the
Employers Representative from month to month depending on the progress of the work, but
shall average 50 No. digital colour prints to be submitted to the Employer’s Representative in
any given month.
The digital photos must be submitted in CD format and be clearly labelled and dated.
4.16
Project Team Workshops
To facilitate close co-operation and communication between the Employer, the Employers
Representative and the Contractor and key subcontractors/suppliers a number of workshops
will be held, to be attended by key members of their staff. These will be in addition to
attendance at meetings such as progress meetings and will not replace the requirement for
acceptance of submissions by the Employer’s Representative.
The Contractor shall include within their tender for attendance of key personnel from the
Contractor’s staff, the Designer’s staff and key subcontractors/suppliers staff at workshops
which shall include the following at a minimum:

One Site Inspection

One Detailed Design Development Workshop

One Handover Workshop
These workshops shall typically be of one day’s duration and shall be held at appropriate
dates to be agreed with the Employer’s Representative. The Contractor shall include the cost
of such workshops in his tender including the provision of appropriate facilities and
refreshments.
4.17
Programme
4.17.1 General
This clause describes the requirements for the preparation, submittal, update and revision of
the Contractor’s programme.
The requirements are in addition to or expand upon the
requirements set out in Clauses 4.9 of the Conditions of Contract.
Page 34
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
The Contractor’s programme shall be used by the Contractor to plan and execute the Works.
The programme will also be used by the ER to monitor progress and be the basis for the
assessment of extensions of time and the effect of delay on the progress of the Works.
The programme shall be produced by the Contractor in the following phases:

Initial Programme - An initial programme for the first three months of work

Detailed Programme - A programme (incorporating the Initial Programme) for the
totality of the Works, which shall be submitted to the ER for review.
If the ER
comments on it, this programme shall be revised and resubmitted for acceptance as
set out in the Contract.

Updated Programme - The Detailed Programme shall be updated with actual
progress and saved at least a monthly basis for record purposes. The Contractor
may submit for review by the ER other revisions to the Detailed or Updated
programmes.
No objection by the ER to any phase of the Contractor’s programme makes the programme a
contract document, or mandates that the Works shall be constructed strictly in accordance
with the programme. The Contractor at all times remains responsible for the construction of
the Works. If at any time there is a dispute or difference between the Contractor and ER over
any matter concerning the Contractor’s programme, then immediate steps should be taken by
either party to have the dispute settled.
4.17.2 Submission of programme
Within two weeks of the Contract Date, and before the Starting Date, the Contractor shall
submit to the ER for its information an Initial Programme showing the order in which the
Contractor proposes to carry out the works anticipated in the first three months following the
award of the Contract. The Initial Programme shall have regard to the contract completion
dates and any other milestones, and/or restraints set out in the Contract.
Within four weeks of the Contract Date, the Contractor shall submit to the ER for its review a
programme for the whole Contract (incorporating the Initial Programme) showing the order of
procedure in which the Contractor proposes to carry out the Works.
This Detailed
Programme shall have regard to the contract completion dates and any other milestones,
and/or restraints set out in the Contract. Thereafter, if the actual progress does not conform
to the Detailed Programme, the ER is entitled to require the Contractor to submit to the ER for
review a revised programme showing the order of procedure and periods necessary to ensure
completion of the Works by the contract completion dates.
The Contractor shall furnish Method Statements and such other details and information as the
ER may reasonably require to review the Detailed Programme.
Page 35
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
The Contractor shall supply the ER with an electronic copy of each programme, together with
a print out bar chart or tabular report in a pre-agreed format.
All programmes shall be
prepared and submitted using Microsoft Project planning software.
Within 10 working days of the Contractor submitting a programme complete with all the
information required by this paragraph to the ER for review, the ER will comment on the
programme.
The Contractor shall take account of the comments and resubmit the
programme within a period of 10 working days.
If the ER does not comment on the
programme within 15 working days, the ER shall be deemed to have no further comments on
the Updated Programme.
By agreement, the Contractor and the ER may dispense with printouts of the various forms of
the Contractor’s programme, but under no circumstances may they dispense with the
submission of the required electronic copies.
4.17.3 Default in submission of programmes
In the event that the Contractor does not submit to the ER a programme for review in
accordance with the information outlined above or does not regularly update the Detailed or
Updated Programme within 15 days of a request from the ER, the Employer shall be entitled
to withhold from the Contractor 15% of any payment to be made to the Contractor until a
Detailed or Updated programme is revised and submitted.
4.17.4 Preparation of Programmes
4.17.4.1
The Initial Programme
The Initial Programme shall show the first three months’ work in the same level of detail as is
required for the Detailed Programme set out in paragraph 4.3 below, but only insofar as it
applies to the first three months of the Contract Period.
The Initial Programme shall also be presented as a programme in bar chart form showing the
detailed activities in the period covered by the network diagram, together with the major
activities and milestones in the remainder of the period of the Contract.
The Initial
Programme shall be presented as or be accompanied by the schedules referred to in
paragraph 4.4 and, if necessary, paragraph 4.5 below.
4.17.4.2
The Detailed Programme
The programme submitted by the Contractor in accordance with paragraph 2.2 above
becomes the Detailed Programme for the purpose of monitoring the progress of the Works.
The Detailed Programme shall form the Contractor’s basic strategy for the completion of the
Works by the contract completion date. The programme may either be at the direction of the
Page 36
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
ER in a linked bar chart format or precedence network format prepared using techniques
acceptable to the ER and shall show as far as reasonably practicable:

The activities in all work packages including those by the principal sub-contractors
and suppliers, statutory undertakers, those contractors and suppliers directly
employed by the Employer and others.

The earliest and latest start and finish dates for every activity in each work package.
Activities shall include all scope activities and any activities or time durations
expected in addition to scope activities.

Access dates for each phase or section.

The earliest and latest start and finish dates for each phase or section, including
dates when the Contractor plans to complete work to allow the Employer and others
to do their work.

Milestone and Key Dates.

Holiday periods.

Dates by which design work or drawings to be produced by the Contractor or subcontractors or suppliers will be submitted to the ER for review and dates by which
comments on such design work or drawings will be required by the Contractor,
allowing time for submittals, re-submittals and reviews.

Dates by which samples to be produced by the Contractor will be submitted for
approval by the ER and dates by which approval of such samples will be required by
the Contractor, allowing time for submittals, re-submittals and reviews.

Procurement periods and delivery dates for the major items of goods, plant and
materials.

Dates by which work will be ready for testing by the ER/Employer.

Details and dates of any information required from the Employer.

Provisions for float, time risk allowances, quality control procedures, health and safety
requirements.

Provision of a contingency for delays to the Date of Substantial Completion of the
Works caused by Compensation Events in accordance with Clause 9.4 of the
Conditions of Contract
The Detailed Programme shall also be presented as schedules showing an analysis of the
network including:

A schedule of all activities tabulated in order of earliest starting date and showing for
each activity:

Activity number and brief description;

Preceding and succeeding activity numbers;

Duration;

Earliest and latest starting and finishing dates;

Total and Free float.
Page 37
Client:
Project Title:

Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
A schedule of leads and lags with (if requested by the ER/Employer) reasons for
them. Excessive leads and lags, negative lags or open/hanging activities, use of
fixed dates and any other programming activities that can have the effect of creating
false criticality or inhibiting the programme from reacting dynamically to change
should be avoided.

A schedule of all activities lying on the paths containing the least float, namely the
critical activities.

A schedule identifying the days of working per week, shifts per working day and
holidays. Where multiple calendars are used, this information shall be provided for
each of the calendars, accompanied by a schedule indicating the calendar applicable
to each activity.

A schedule giving details of the Contractor’s resource requirements in terms of
manpower, gang sizes, tradesmen, work rates, items of plant or equipment and
materials and quantities of work allowed for in sufficient detail to explain the
Contractor’s activity durations.
Activities that may be the Contractor’s activity
durations. Activities that may be expedited by use of overtime, additional shifts or
any other means shall be identified and explained.
The Detailed Programme shall also be presented with or be accompanied by the following
schedules:

A schedule of all submittals and material procurement activities, including time for
submittals, re-submittals and reviews and time for fabrication and delivery of
manufactured products.
The interdependence of procurement and construction
activities shall be included in the schedule.

A schedule giving the monetary value of each activity for cash flow purposes. The
sum of the monetary values shall total the Contract amount. The schedule shall also
give the payment items applicable to the activity monetary values.

A schedule giving the information stated in the paragraph below.
The Detailed Programme shall be prepared in sufficient detail to ensure the adequate
planning, execution and monitoring of the work. Activities should generally range in duration
up to 28 calendar days (single trade activities with uniform rates of progress might be
considered as an exception) and the number of activities with duration of less than seven
calendar days should be kept to a minimum to make progress monitoring more manageable.
The Detailed Programme shall take into account all time risk allowances, including time for
the weather conditions (rain, wind, frost and snow) reasonably to be anticipated by the
Contractor.
The Contract time has been defined on the assumption that the weather
conditions will conform to at least a 10 year average of the conditions prevailing at the Site.
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Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
The Contractor shall provide this data and a summation of the assumed number of adverse
weather days per month to the CA with the programme.
4.17.4.3
Methods of Construction and Temporary Works
At the same time as the Contractor submits the Detailed Programme, the Contractor shall
submit to the ER for its review a general description of the arrangements and methods of
construction and Temporary Works designs the Contractor proposes to adopt for the carrying
out of the Works (‘the Method Statement’). The Method Statement should be fully crossreferenced to the activities in the programme.
The Contractor shall submit to the ER sufficient information as may be considered reasonably
necessary by the ER to interpret, evaluate and undertake a purposeful review the Method
Statement. The Contractor shall, whenever required by the ER, furnish for its information
further and more detailed particulars of the Contractor’s Method Statement.
Should the
Contractor wish to change a Method Statement or should the ER subsequently object to a
Method Statement then the Contractor shall submit a revised Method Statement to the ER for
its review.
No objection by the ER to the Contractor’s Method Statement does not make the Method
Statement a contract document, or mandate that the Works shall be constructed strictly in
accordance with the Method Statement. The Contractor at all times remains responsible for
the construction of the Works in accordance with the Contract or the Works Requirements or
Legal Requirements.
4.17.4.4
Cash flow estimates
Within four weeks of the Contract Date the Contractor shall submit to the ER for its
information a detailed cash flow estimate, in quarterly periods, of all payments to which the
Contractor considers it will be entitled to under the Contract.
The Contractor shall
subsequently submit such revised cash flow estimates at quarterly intervals based on the
Updated Programme, if required by the ER.
4.17.4.5
Revising and updating the programmes
The Detailed Programme
The Detailed Programme (or, if the Detailed Programme has already been updated, the
Updated Programme) and the corresponding Method Statement if required by the ER shall be
revised by the Contractor within 10 working days of the Contractor changing its methods
and/or sequences of working or, if the changes are frequent, revised at least every month.
The programme shall also be revised within 10 working days of the grant by the ER of an
extension of time, or whenever circumstances arise that in the opinion of the ER affect the
progress of the Works. Each revision to the programme shall be submitted to the ER for its
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Client:
Project Title:
review.
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
Each revised programme submitted for review shall be presented as or be
accompanied by the Schedules referred to in the sections above, together with any
amendments to the Method Statement.
The Updated Programme
The Detailed Programme shall be updated for actual progress at least once every month and
the updates shall be archived as separate electronic files for record purposes. The updates
shall include all scope activities and any additional activities carried out or time durations
experienced in addition to the scope activities. Actual progress shall be recorded by means
of actual start and actual finish dates for activities, together with percentage completion
and/or remaining duration of currently incomplete activities. Any periods of suspension of an
activity should be noted in the Updated Programme. Each Updated Programme shall be
submitted to the ER for his review as a record. It is possible (if the Works have been delayed)
that these Updated Programmes will show completion later than the contract completion
dates. In this event the ER’s review of such programmes will not constitute acceptance of the
delay(s).
The Updated Programmes will be used by the ER to monitor the Contractor’s performance
against the Detailed Programme, forecast work to be performed in the subsequent period and
to assess extensions of time at the time the cause of delay occurs. In order to provide
effective monitoring of performance, the Contractor shall also provide to the ER the progress
reports as described and the cash flow estimates described above.
The final Updated
Programme may be used as the as-built Programme.
Page 40
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
SECTION 5 – DRAWINGS AND REPORTS
5.1
Environmental Impact Statement & Approval
A full copy of the Environmental Impact Statement is contained in Volume D of the Contract
Documents. The scheme approval received from An Bord Pleanála based on this EIS is
contained in Volume D of the Contract Documents.
5.2
Specimen Drawings
The specimen drawings provided are those drawings submitted to the An Bord Pleanála as
part of the EIS process and additional drawings amending or adding the information
presented in the original O’Connor Sutton Cronin drawings. The drawings show the indicative
design, the works boundary, the tree protection measures and other key plans. A full set of
the drawings is provided in softcopy in Volume D of the Contract Documents, both in PDF and
AutoCAD format. These are provided for information only and responsibility for the design
rests with the Contractor.
5.3
CPO Drawings
A full digital set of the drawings is provided in Volume D of the Contract Documents.
5.4
Reports
5.4.1
Physical Model Report
In 2008 HR Wallingford Ltd undertook a hydraulic model study to assess the effects of the
proposed flood relief scheme on flood water levels. The report contains results of the tests
carried out to predict the effect of the flood defence and flood alleviation measures on peak
flood water levels. The report is contained in Volume D of the Contract Documents.
5.4.2
Site Investigation Reports
Four number site Investigation reports are included in Volume D of the Contract Documents.
These reports relate to four different site investigation contracts that were undertaken at various
times with the limits of the proposed works. These are provided to the Contractor without
warranty. The reports are as follows:
 IGSL Report, River Flood Defence Works, October 2010
 Byrne Looby Report, River Dargle Flood Study Phase 2, November 2009.
 IGSL Report, Dargle Bridge, August 1999.
 JBBarry/IGSL Report, River Dargle Flood Protection Contract 1, May 1989.
The position of the boreholes and trial holes are shown in the Site Investigation Factual
Reports. The results of the site investigations, including borehole logs, trial pit logs, slit trench
logs, grading analysis, and the results of all testing, are contained in the Site Investigation
Factual Reports. Details on the location of some services are also provided.
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Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
The results in the Site Investigation Factual Reports are given for the information of the
Contractor. The Contractor is to draw his own conclusions and interpretation from the reports
provided.
5.4.3
Invasive Species Report
Natura Environmental Consultants undertook an exercise in 2010 to map the current locations
of the various invasive species along the length of the works. This report is contained in
Volume D of the Contract Documents. This document is provided to the Contractor without
warranty.
5.4.4
Preliminary Hydrogeological Assessment
A preliminary study of the effects of the works on the hydrogeology of the area has been
undertaken. This is included in Volume D of the Contract Documents and the Contractor
should be aware of the recommendations of this report and account for them in his design.
The Contractor is required to undertake a detailed Hydrogeological Assessment based on his
design and the impact it will have on the ground movement in the area.
Page 42
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
SECTION 6 – PERFORMANCE SPECIFICATION
6.1
General
The Contractor is required to construct the works in accordance with the restrictions as set
out in the EIS. The Contractor is responsible for the detailed design of the works but should
note that material contraventions of the EIS must be submitted for approval to the local
planning authority.
The local planning authority does not guarantee that any such
contraventions or amendments to the existing planning will be approved.
It is the Contractor’s responsibility to reference all materials provided with the Contract
Documents and to establish a full and comprehensive list of all restrictions. The Contractor’s
attention is specifically drawn to the Environmental Impact Statement (EIS), the EIS Approval
from An Bord Pleanala (ABP), the Planning and Wayleave documents, the Works
Requirements and all other relevant reports, studies and information provided in the Contract
Documents.
In addition the Contractor must also comply will all current legislation and
building regulations.
6.2
Planning Permissions and Other Consents, Permits
The following Condition is deemed to be incorporated in the Contract:
“The Contractor acknowledges and agrees that insofar as planning permission or other
consents or permits may be required to be obtained by the Contractor in relation to his
specific proposals for the carrying out and completion of the Works that the Contractor shall
be responsible for obtaining, at his own cost, such permission, consents or permits. Further,
the Contractor acknowledges and agrees that he shall not be entitled, notwithstanding any
other provision of the Contract, to any extension of time for the completion of the Works or to
any compensation or payment by reasons of any necessity to obtain or delay in obtaining any
such planning or other consents or permits”
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Client:
Project Title:
6.3
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
Hydraulic Performance Parameters
6.3.1
General
Detailed Hydraulic Modelling has been undertaken for the flood defence scheme. The results
of this work are contained in Volume D primarily in the report entitled “River Dargle at Bray,
Ireland – Flood Defence Scheme: Physical Model Study, Report Ex 5956, Release 5.0, March
2009, HR Wallingford”. The specimen design drawings also include some information on the
required flood defence levels as does the Environmental Impact Statement. However the
Contractor must satisfy himself as to the accuracy of the information contained in any of the
documentation that forms part of the Contract.
The Physical Model Study examined several scenarios, the outline performance specification
is given below but the Contractor must review all the information provided and ensure that the
hydraulic design of the scheme is in compliance with all recommendations made in the
provided literature. In addition the hydraulic design shall be in accordance will all relevant
industry standards.
6.3.2
Design Flood Return Period
As the River Dargle is tidally influenced at Bray, the following Joint Probability has been
adopted as the design Return Period (RP)

200 year RP tide (3.50m OD) and 1 year RP fluvial flood (145 m 3/s)

100 year RP fluvial flood (i.e., 300 m3/s) and MHWS (Mean High Water Spring of
1.59m OD) tide
6.3.3
Design Water Levels and Velocities
The Physical Model was simulated for various scenarios of flood alleviations measures. For
example, Simulation 1 was for the existing condition whereas Simulation 10 for the Optimised
Flood Defence Scheme. Water surface levels at design flood at various locations along the
river are presented in Table 82 and 85 of the Physical Model Study whereas flow velocities
are presented in Tables 87 and 90 respectively.
6.3.4
Design Considerations
The above report does not recommend for any specific design parameter, except some
issues mentioned in Appendix O of the Physical Model Study (see below). Therefore, the
design parameters are generally those based on best practice and used in Ireland for civil
engineering works.
Appendix O of the Report has listed the following issues those have to be considered while
designing the scheme:

High discharge river flows arrive at the site rapidly

High flow velocities and depths associated with river flood discharges
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Client:
Project Title:

Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
High flow velocities through harbour entrance associated with high discharge river
flows

Importance of maintaining re-graded/re-aligned channel profile in order to improve
standard of flood defence

Importance of maintaining flood walls / embankments in order to improve standard of
flood defence

Provision for safe construction and maintenance of debris trap

Implication of local scour at the piers/abutments of Bray Bridge for the structural
integrity of the bridge

Provision for safe operation and maintenance of trash /security screen at entrance to
flood relief channel

Provision of ventilation for flood relief channel

Maintenance, in clean and working order, of pipes/slots in flood relief channel

Maintenance, in clean and working order, of the non-return valves in the pipes in the
flood relief channel
6.3.5
Freeboard
The Required Flood Defence Level shown on the Specimen drawings includes an allowance
for freeboard, equal to 500 mm upstream of Bray Bridge, where fluvial influences dominate,
and 760 mm downstream of Bray Bridge, where tidal influences dominate. Any steps in the
defence crest level shall maintain this minimum freeboard above the Design Flood Water
Level shown on the Specimen drawings.
6.3.6
Transition Structures
The Contractor shall design and provide suitable transition structures between adjacent flood
defence components. Transition structures shall be designed to maintain the integrity of the
flood defence both in terms of the crest level and in the prevention of seepage flows.
6.3.7
Erosion Protection
Where erosion protection is needed, either in areas as shown on the Specimen drawings or
as determined through the detailed design by the contractor it shall be suitable for the design
life of the defences and the appearance sympathetic to the location. Erosion protection shall
be designed so that it ties into the upstream and downstream alignment without causing local
points of erosion at the interface.
6.3.8
Low flow channels
Important characteristics for good salmonoid habitat are 140mm ≤ water depth ≤ 280mm,
0.22m/s ≤ flow velocity ≤ 0.38 m/s. This should be considered in the design and construction
of the low flow channels. However the Contractor is responsible for agreeing such design
parameters with Inland Fisheries Ireland.
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Client:
Project Title:
6.3.9
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
Drainage
The defences shall not detrimentally affect the hydraulic performance or structural integrity of
any existing surface water, foul water or combined drainage systems at any river level up to
the crest level of the defences. A number of outfalls exist along the length of the flood
defence scheme. Every effort has been made to record these services and to illustrate them
on the site survey drawings. However it is the Contractors responsibility to satisfy himself as
to the accuracy and completeness of this information.
All existing outfalls shall be
incorporated in the Contractor’s design flood defences. The Contractor shall make all the
necessary provisions to ensure that existing surface and foul water drainage arrangements
are not impeded by the presence of the defences in flood or non-flood states.
The planning approval for the works granted by An Bord Pleanála contains a condition that an
examination of the potential groundwater movements be undertaken as part of the detailed
design. The Contractor must undertake this work as part of the detailed design and ensure
that the works do not detrimentally alter current drainage regimes. Any such effect must be
rectified as appropriate. The Contractor should take note of the Hydrogeological Assessment
Report contained in Volume D and the considerations for design outlined therein.
In the event of the new defences being overtopped by flood-water during a flood and when
river levels begin to subside, there will be a need to release trapped flood water from the land
side of the defences.
The Contractor shall make allowances in his design for such an
occurrence along the whole length of the works. Particular reference is made to the centre of
Bray, the removal of a wall adjacent to Castle Street Shopping Centre and the construction of
bollards. Furthermore surface water flows from Dwyer Park through the Golf Club Lands shall
be intercepted by the Emergency Flood Relief Channel as shown on the specimen drawings.
This will discharge into the River Dargle upstream of the Harbour Bridge.
All proposed
outfalls shall include a non-return valve on the outlet into the river. Futhermore the Contrators
design shall take account of surface water run-off paths which currently drain freely to the
River Dargle. The final design shall make provision for the transfer of such flows to the river
to prevent properties/land becoming saturated behind the proposed flood defences.
All non-return valves shall be duckbill or tideflex valves.
Any non-return valves and
associated structures which pass through the flood defences shall be designed to
accommodate design water level and all other relevant dead and imposed loadings, including
impact from floating debris.
Consideration shall be given to future access to non-return
valves for maintenance and inspection.
Where appropriate, non-return valves shall be
positioned to allow safe access for maintenance purposes. Proposals for future access to
non return valves shall be included in the Contractor’s design.
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Client:
Project Title:
6.4
6.4.1
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
Structural Performance Parameters
Design Working Life
The required design life for all structures shall be 100 years. The design life for cladding shall
be a minimum of 50 years.
Furthermore the design life of the boardwalk and all of its
components is to be a minimum of 50 years. The Contractor will be required to demonstrate
that the design life has been satisfied.
6.4.2
Standard of Defence
The defences shall prevent the ingress of flood water from the River Dargle and relevant
sections of tributaries through any pipes, ducts, culverts, permeable ground or around the
defences. This shall also apply to the location where the proposed defences link in with
existing defences. Connection details must be considered and submitted for each of these
locations.
6.4.3
Water loading
All structures and embankments shall be designed to resist flood water at crest level for a 12
hour period and to remain stable when overtopped to a depth of 100mm. Walls adjoining
public roads should also be designed to withstand vehicle impact loading, in accordance with
IS EN 1991-2, IS EN 1991-1-7 and NRA / DMRB TD 19/09. Structures must be stable in a
post flood rapid drawdown condition, that is with the river returned to normal levels and
landward groundwater level is at the surface. Walls protruding above ground level must resist
wind loading in accordance with IS-EN-1991-1-4 General Actions – Wind Actions. Flood
defence walls must be designed to resist the possibility of future soil creep and not be
susceptible to damage from tree roots.
6.4.4
Seepage
Steel sheet pile seepage cut-off walls or similar shall be provided as necessary. They shall
be installed to sufficient depth to prevent seepage.
The Contractor shall provide design
calculations to demonstrate this.
6.4.5
Existing Defences
Existing structures may be retained if the Contractor can demonstrate that they have sufficient
residual life. The Contractor shall confirm the structural condition of any existing element
which will form any part of the flood defences. The stability of the Works under loaded
conditions shall not rely on the unknown strength or stability of the existing defences. Where
appropriate the Contractor shall undertake necessary investigations, design work,
modifications and strengthening works to the existing structures to ensure they meet the
design requirements and asset life for the scheme. Where the existing defences are left in
place then they shall be in a safe and stable condition and finished to an acceptable
appearance.
The defences shall not detrimentally affect the stability of existing tidal
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Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
defences, fluvial defences, river banks and adjacent or connecting structures. The Contractor
must ensure the structural stability of the existing structures is maintained at all times both
under design loading and during construction works. The Contractor must demonstrate this
to satisfaction of the Employer’s Representative prior to undertaking any works in the vicinity
of existing defences.
Where works involves excavation next to, underpinning of, sheet piling or work associated
with existing walls, gabions, bridge piers, bridge abutments or other similar structures the
Contractor shall submit a method statement specifically addressing how the protection of the
existing walls or structures etc are to be undertaken. Any damage which does occur will be
repaired at the Contractor’s own cost. Existing walls and structures within the vicinity of any
proposed excavation works must be assumed to require underpinning until proven otherwise
to the satisfaction of the Employer’s Representative.
6.4.6
Foundations
Foundation levels of new walls along the river at or below bed level shall be constructed such
that the bottom of the foundation will note be subject to scour taking into account the regraded
level for the river. Regraded levels are taken as linearly interpolated between known hard
points. These hard points are currently derived from the existing survey data; the Contractor
shall verify the accuracy of this information and confirm the suitability of the re-grade lines that
are derived from it.
6.4.7
Corrosion
The Contractors attention is drawn to the fact that the flood defence walls must be designed
to withstand the environmental actions which they will be subject to. All materials must be
designed to withstand a saline environment, river environment and chemical attack from
constituents of the soil. The corrosion resistance of the materials must take into account a
100 year design working life each element of the structure.
6.4.8
Cladding to Walls
Cladding shall be suitably robust to withstand all reasonably foreseeable loadings including
hydrostatic loading from flood waters and impact from floating debris. Cladding shall be
suitably attached to the proposed defence wall using a suitable fixing system and spacing
necessary to withstand the anticipated loading and to meet the required design life of the
defences. Where stone cladding is required consideration shall be given in the design to
filling any voids between the cladding and the structural element (sheet pile, concrete wall
etc) or other means to prevent movement of the cladding under hydrostatic pressure. Where
timber or similar cladding is required consideration shall be given in the design to the cavity
between the cladding and the structural element (sheet pile, concrete wall etc). The cavity
Page 48
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
must be designed in such a way as to prevent debris lodging in it and also to prevent
corrosion from moisture and stagnant water.
The fixings shall be designed and specified so that staining or discolouring of the cladding
does not occur in the future as a result of any weathering or degradation of fixings. All
connections (bolts, washers etc) must be designed to withstand corrosion from the
environment and be compatible with the protection system used on the main steel and
cladding elements.
6.4.9
Boardwalk
The new pedestrian walkway along Dargle Road shall be designed to cantilever off the new
defence wall on the river side of the defence. Drawing B237-165 of the specimen drawings
provides an outline graphical representation of the expected aesthetic finish of the boardwalk.
Further details of the proposed finish are provided under the Architectural Performance
Specification. The walkway shall be tied into the existing ground level at People’s Park and at
Bray Bridge.
The required flood defence wall level shall not be compromised by the
boardwalk at the point where the boardwalk passes over the defence to the dry side.
The wall supporting the boardwalk must be designed as a flood defence wall which will also
support the dead load of the cantilevered boardwalk and all imposed loads (variable actions)
as stated in IS EN 1991 – 1 on the cantilevered boardwalk. The boardwalk must be designed
to support imposed loads (variable actions) as per category “C5” Table 6.1 IS EN 1991 – 1 –
1, in conjunction with IS EN 1991 – 1 – 3 Snow Actions & 1991 – 1 – 4 Wind Actions and all
other relevant sections of IS EN 1991 – 1, including load model 4 (crowd loading at 5KN/m 2).
The design should take account of additional load factors including thermal effects, accidental
damage, loading from rising flood waters and moving flood waters underneath, impact from
floating debris during flood conditions, submersion in flood water. The design of the walkway
shall take account of access and surfacing shall be suitable for wheelchairs as well as
pedestrian traffic. The minimum width of decking shall be 2.5m.
6.4.10 Culvert
The proposed culverts must be designed in accordance with IS EN 1991-2 Traffic Loads on
bridges, IS EN 1992-2 design of concrete structures – bridges and IS EN 1993-5 Design of
steel structures – Piling.
6.4.11 Embankment Design
Newly formed embankments and re-profiled embankments to suit the proposed cross section
profile are to be designed with suitable stability measures to protect the embankment against
erosion or deformation.
These measures may include earth reinforcement and or scour
protection mats or similar. Embankments shall have maximum side slopes of 1 in 2 unless
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Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
otherwise shown on the specimen drawings. The Contractor shall provide erosion protection
to exposed sections of embankment as indicated on the Specimen drawings where fluvial
flows or anticipated traffic dictates. Sufficient impermeable layers and filter layers must be
incorporated in to the embankment design so as to prevent erosion of the slopes.
The
Contractor will be responsible for obtaining a source of material for the flood defence
embankment fill. All material and methods used shall comply with the relevant sections of
Series 600: Earthworks of the NRA specification for Roadworks, in particular table 6-1 and
appendix 1-5.
6.4.12 Debris Trap
The proposed debris trap in Area 4 shall at a minimum consist of elliptical concrete piers
dimensions 1.65m by 0.5m maximum width; the top of the pier shall to terminate 300 mm
above design flood level. The piers should form a gentle arc across the river channels with a
maximum clear opening between each pier and river bank of 4000 mm. The foundations of
the piers should be designed to withstand hydrostatic and debris loading from a differential
water level across the debris trap of 1500 mm. Bottom of pier foundations will not be subject
to scour taking into account the regraded level for the river. Finish of the pier is to be fair
faced concrete. The debris trap will be accessed and cleaned by in river vehicles from the
upstream side.
Exact positioning of the debris trap piers is to be detailed on detailed
construction drawings and agreed with the employer’s representative before construction.
6.4.13 Railings and Handrails
Railings/Handrails are required at locations where there is a risk to members of the public
from unprotected edges of the flood defences or in accordance with the relevant health and
safety requirements. All railings and handrails which are not in the vicinity of traffic and are
not required to act as a crash barrier must be designed to resist horizontal loads in
accordance with category C5 of IS EN 1991-1-1 Table NA.5. The railings / handrails and all
of the connections must be designed to resist external conditions close to a marine
environment.
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Client:
Project Title:
6.5
6.5.1
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
Architectural Performance Parameters
General
The Contractor’s attention is drawn to the finishes stipulated in the EIS and on the specimen
drawings. The Contractor shall submit details and samples of all proposed finishes to the
Employer’s Representative and the Planning Authority prior to the commencement of works.
The planning authority will have the right to reject any proposed material or finish it does not
deem in keeping with the local environment. The Contractor should be aware that the River
Dargle is a saline environment, subject to varying water levels. All works, including finishes
and fixings, shall be designed to resist the deleterious effects of such an environment. The
design life for cladding, the boardwalk and all the components both systems shall be a
minimum of 50 years. The Contractor will be required to demonstrate that the design life has
been satisfied.
The Contractor shall note that where cladding or other finishes are shown on the specimen
drawings, detailed in the EIS or specified elsewhere in the Contract Documents these finishes
shall be provided to both the land side and the river side of the proposed flood defence
structure.
6.5.2
Stone Cladding
The stone cladding shall be of Wicklow Granite or other natural stone of similar colour to the
existing environment. All stone shall be derived from the same quarry to ensure that it is of
consistent colour and texture. Samples of all proposed finishes shall be provided to the
Employer’s Representative and the Planning Authority prior to the commencement of works.
The planning authority will have the right to reject any proposed material or finish it does not
deem in keeping with the local environment.
6.5.3
Timber/Timber Type Cladding
The timber/timber type cladding shall be designed to blend with the receiving environment as
far as possible and reduce the overall visual impact of the scheme. Samples of all proposed
finishes shall be provided to the Employer’s Representative and the Planning Authority prior
to the commencement of works. The planning authority will have the right to reject any
proposed material or finish it does not deem in keeping with the local environment.
6.5.4
Boardwalk
The boardwalk shall be of good contemporary design and in keeping with the natural setting;
the design should allow good visual access to the river for users. The boardwalk is located in
a saline environment and the proposed materials will account for this. All metallic elements,
including mechanical fixings, are to be manufactured from stainless steel. All connections
(bolts, washers etc) must be designed to withstand corrosion from the saline environment and
be compatible with the main steel and timber elements. The walking surface of the boardwalk
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Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
must be non-slip surface and be sufficiently durable to cater for foot traffic. The walking
surface shall be manufactured to meet the required design life. The decking shall be non–
structural and will be able to be replaced from walkway level without removal of the handrail
or need for access from below or from the river. Any materials to be used in the construction
of the boardwalk must be resistant to spray from the river water which may contain chlorides.
6.5.5
Roads and Footpaths
Paving materials shall be designed sensitively to visually integrate with the location. They
should utilise typically used local materials and detailing, and where appropriate matching
paving as necessary to tie in to existing footpaths and surfacing, particularly where
reinstatements are required. Sections of new footpath or surfacing should be designed with
finishes and detailing appropriate to the setting and context following consultation with all
interested parties.
6.5.6
Railings and Handrails
The railings and handrails shall be of good contemporary design and in keeping with the
natural setting; the design should allow good visual access to the river for users.
The
proposed materials will account for the saline environment and must be resistant to spray
from the river water which may contain chlorides. Samples shall be provided to the Employer
Representative and the Planning Authority for approval prior to the commencement of works.
The planning authority will have the right to reject any proposed material or finish it does not
deem in keeping with the local environment.
Page 52
Client:
Project Title:
6.6
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
Ecological Performance Parameters
6.6.1
General
An Environmental Impact Statements (EIS) under SI 1217 or SI 1199 has been prepared for
these Works. The effects and requirements (known and anticipated) of the EIS shall be
incorporated in the design, procurement, delivery, construction and testing of the Works. The
EIS is a legally binding document. The Contractor shall control their work in accordance with
the EIS.
Natura Environmental Consultants undertook an exercise in 2010 to map the current locations
of the various invasive species along the length of the works. This report is contained in
Volume D of the Contract Documents.
Further surveys regarding the habitat locations of
kingfishers, otters and rare plant may be undertaken by the Client during the appropriate
timeframe prior to contract award. These surveys are recommended as part of the EIS to
provided further clarity on known restrictions and if undertaken they will be furnished to the
Contractor prior to the commencement of the works as further information to that already
provided in the EIS. The Contractor must comply with the restrictions of the EIS.
6.6.2
Contractor’s Ecologist
The Contractor is required to employ a suitably qualified Ecologist who will assist the
Contractor in ensuring the Works are carried out with minimal environmental impact and in
accordance with the EIS. The Contractor’s Ecologist will be responsible for reviewing the
ecology studies already undertaken and satisfying himself to the adequacy of these studies
and the recommendations thereof. The Contractor’s Ecologist will be responsible for liaison
with the National Parks and Wildlife Service, Inland Fisheries Ireland and all other relevant
bodies as well as securing all required permits and licences to undertake the works. A full
programme for ecological works shall be submitted to the Employer’s Representative prior to
the commencement of any works.
This programme will demonstrate how the ecological
works are scheduled in conjunction with the construction works and shall make allowances for
any delays that may be incurred due to these works. The Contractor shall allow in their prices
for any disruption as a result of any such delays.
The role of the Contractor’s Ecologist will include but is not limited to the following:

Liaison with National Parks and Wildlife Service, Inland Fisheries Ireland and any
other relevant party,

Undertaking all and any required surveys pre, post or during construction

Providing the Employer’s Representative with progress reports on environmental
matters

Inspecting and assessing the working areas and access routes with regards to
environmental impact

Identifying, implementing, and documenting mitigation and enhancements
Page 53
Client:
Project Title:

Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
Producing a report at design stage on the Contractor’s proposed design detailing the
impacts of the propose design and construction, mitigation measures to be
undertaken and detailing the long-term impacts of the proposed design.

Producing a report on completion the scheme and on completion of the Contract
outlining the environmental issues and actions

Overseeing the re-creation of appropriate habitats on the works and working areas

Ensuring appropriate and sufficient environmental scientists are involved in a timely
manner in the design development and delivery phases of the Contract
Producing a schedule for environmental performance monitoring following the completion of
the scheme to comply with the requirement of the EIS and the planning approval.
6.6.3
Invasive Species
The Contractor shall assume that invasive weeds will be present at the majority of the sites
where significant earth moving is proposed. The Contractor shall make due allowance for this
contamination in the relocation of arisings from earth moving activities, either within the
scheme proposals or for their disposal off site, to ensure all work is undertaken according to
legislative requirements that there is no further spread or proliferation of invasive weeds.
Invasive weed species including Japanese Knotweed and Giant Hogweed are present on the
Site. The Contractor shall ensure that all locations affected by these species are located and
recorded prior to any works commencing on site to establish the requirement for the
implementation of suitable methods of working to deal with the species identified. All method
statements to be approved by the Employer’s Representative in advance of the Works
commencing. The Contractor shall ensure that operations in areas where these species are
present, as a minimum, follow the guidelines as provided by the Environment Agency to
prevent the spread or proliferation of these species. Where these plants are to be removed as
part of the Works the plants and contaminated soil shall be handled and disposed of off site to
the Environment Protection Agency guidelines. Giant Hogweed poses a health and safety risk
and the Contractor shall ensure that workers are fully briefed to take the necessary safety
precautions before working in areas affected by this species with suitable PPE.
Where invasive plants have been removed from soft landscape areas the reinstatement of
those areas shall include the backfilling of the excavation with suitable grade subsoil and
topsoil to match existing profiles; and immediate planting and establishment of native planting
to provide ground cover and prevent re-colonisation of invasive species. Where native
planting is inappropriate to the location (such as amenity parkland areas or third party
property) the Contractor shall submit alternative planting proposals for approval by the
Employer’s Representative.
6.6.4
Ecological Constraints on Construction Activities
Page 54
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
The Works are located in an environmentally sensitive area. Constraints and requirements
highlighted by the EIS with respect to the design and construction of the scheme are covered
by the planning permission and conditions attached. The Contractor shall take measures to
limit and mitigate for any environmental impacts, at a minimum these measures are those
detailed in the EIS.
The Contractor shall study and implement these measures, major
elements of which at the construction stage are:
Further consideration of the potential for disturbance to contaminated land
Hold documented meetings with interested parties
Carry out walkover surveys of each site prior to commencement of works to identify presence
of any protected species and fence off any vulnerable areas.
Incorporate environmental enhancements into the Works
Undertake environmental awareness training for site personnel
6.6.5
Faunal Surveying and Works
Areas that might be affected by construction activities will include access routes for
construction traffic, areas for storage of excavated materials, site materials storage areas, site
depots etc. These have not been detailed in present proposals for the various flood relief
scheme options, and will require faunal surveying at a later stage.
Prior to any works
commencing, a pre-construction survey for otter holts shall be conducted by the Contractors
Ecologist at appropriate season (winter). If a holt(s) is found, appropriate mitigation will be
required, which may include the construction of artificial holts to replace loss of natural holts.
Such work would be carried out under licence from the National Parks & Wildlife Service.
6.6.6
Badgers, Otters and Bats
Preconstruction badger survey shall be conducted in winter. Should a badger sett be found
where disturbance will occur, appropriate mitigation measures will be necessary.
Preconstruction survey for otter holts shall be conducted in winter and mitigation measures
taken as appropriate. Otter ledges to be included in revised bridge structure, allow otters
access by means of inclines downwards to the river at each end, on southern side of culvert.
Expert advice should be sought where culverts are proposed for tributary streams. The
Contractor shall make due allowance for the carrying out of a detailed bat survey by a fully
approved bat specialist, prior to the commencement of construction works, at older buildings,
structures and trees in the vicinity of scheme proposals. The Contractor shall programme
their works to take account of the findings of that survey and the seasonal constraints, which
the presence of bats would bring about. The Contractor shall make provision for further bat
mitigation measures, which may include the installation of artificial bat roosts, as part of the
Works. Mature or ivy-covered trees that require felling will be felled under supervision of a
bat specialist during March, April, May or September, October, November
6.6.7
Greater Yellow Cress
Page 55
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
Great Yellow Cress was discovered in 1966 at the south bank of the River Dargle adjacent to
the sewerage treatment works/Seapoint Court and is still existent there. This is the only
occurrence of this species in County Wicklow and thus is of significant importance. The
transplantation, storage and translocation of the Greater Yellow Cress must be carried out.
The species can be collected as seedling and/or mature plants during autumn or preferably
spring and maintained at a suitable (and safe) location for the duration of the project. It will be
subsequently re-located to a site as close as possible to its current location on completion of
the works. A plant ecologist familiar with the species will be retained by the Contractor to
oversee these works. Volume D contains a quotation and works description for these works.
6.6.8
Bats and Birds
Trees which are to be removed should first be assessed for likely bat roosting opportunities
by the Contractors Ecologist/bat specialist and then felled during the spring months of March,
April and May or the autumn months of September, October and November. However the
bird breeding season will need to be considered during the spring period. A bat box scheme
will be put in place to off-set the loss of any bat roosts. Approx 5 – 10 Schwegler bat boxes of
the 2F design would suffice. These may be placed on selected deciduous trees in the locality
of the removed roosts. Bat boxes if required must be place prior to any construction works
being undertaken.
Retention of riparian vegetation is recommended were feasible.
Alternatively an appropriate landscaping and planting programme based on native tree and
shrub species, is required to restore riparian habitats. Plants that emit their scent at night
could be planted to attract insects during the hours of darkness.
If works are planned during the nesting season (1st March to 31st August) a survey will be
carried out by the Contractors Ecologist to establish the exact location of kingfishers nests
and works at active nest sites will not be permitted during nesting season. As a known nest
site will be destroyed, provision will need to be made to provide an alternative site. This
should preferably be in a regraded sand/gravel cliff in the same general location to where the
existing nest hole is.
Expert advice will be sought from NPWS.
vegetation is recommended were feasible.
Retention of riparian
Alternatively an appropriate landscaping and
planting programme based on native tree and shrub species such as willow and alder, is
required to restore riparian habitats.
6.6.9
Vegetation Management
Wildlife Act 2000, restricts the cutting, grubbing, burning or destruction by other means of
vegetation growing on uncultivated land or in hedges or ditches during the nesting and
breeding season for birds and wildlife (1st March to 31st August). If an exemption is required
the Contractor is fully responsible for obtaining such consents from the NPWS or any other
relevant authority. Retention of riparian vegetation is recommended where feasible for the
protection of the Kingfisher & other bird species. The Contractors Ecologist shall advise on
Page 56
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
the suitability of certain planting combinations at the individual locations. Mitigation measures
to protect trees that will remain with special attention to the south bank between Glenwood,
through Killarney Glen to the N11 Bridge. Trees which may be vulnerable to damage during
the construction works to be identified before construction works begins and the appropriate
tree protection measures, as recommended by the Landscape Architect implemented.
6.5.1
Reinstatement
Following the completion of the flood defence scheme, or sections thereof, a programme of
habitat reinstatement should be initiated. The most important element of this will be the return
of the riverbed material removed prior to the re-grading of the river. This material, cobbles,
sand and gravel, will provide the material necessary for the river to recover more quickly to a
more natural state, and one more suitable for the support current macroinvertebrate
community and salmonid population. Where the riverbank is to be left in place, or merely reprofiled suitable terrestrial works should be considered to encourage the recolonisation of the
banks by riparian vegetation, to allow more a more natural riparian zone emerge and to
reduce the input of suspended solids into the river from bare soil on the river banks.
6.6.10 Dust, Sediment and Mud
Dust and mud resulting from the Works shall be reduced as far as possible through the use of
wheel washers, road cleaners and damping down of the site. Construction management plan
shall incorporate the practices outlined in CIRIA’s “Control of Water Pollution from
Construction Sites”. During dry periods, water sprays may be required to minimise dust.
Temporary stockpiling of soil should be designed to minimise exposure to wind. Measures
will be implemented to reduce the release of sediment into the watercourse. Any storage of
sand/gravel/soil should be kept away from watercourses.
6.6.11 Site after Care
Once works have been completed and site compounds are no longer required the
compounds will be decommissioned and re-instated to its original condition.
Page 57
Client:
Project Title:
6.7
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
Archaeological Performance Parameters
6.7.1
Contractor’s Archaeologist
The Contractor is required to employ a suitably qualified and licensed Archaeologist to
undertake the required archaeological surveys and monitoring works.
The Contractor’s
Archaeologist will be responsible for reviewing the archaeological studies already undertaken
and satisfying himself to the adequacy of these studies and the recommendations thereof.
The Contractor’s Archaeologist will be responsible for liaison with the National Heritage
Service and all other relevant bodies as well as securing all required permits and licences to
undertake the works. A full programme for archaeological works shall be submitted to the
Employer’s Representative prior to the commencement of any works. This programme will
demonstrate how the archaeological works are scheduled in conjunction with the construction
works and shall make allowances for any delays that may be incurred due to the discovery of
materials of archaeological potential.
The Contractor must account for the cost of all
archaeological works in his tender price.
In the event of archaeological features being uncovered, the Contractor shall seek the advice
of the National Monuments Section, Department of the Environment, Heritage and Local
Government. The Contractor shall submit reports describing the results of the works to the
relevant authorities. The Contractor shall allow in their prices for any disruption as a result of
slow working and any archaeological finds, and also reschedule their works elsewhere at
short notice.
6.7.2
Archaeology
The following is a non-exhaustive list of archaeological requirements taken from the
Environmental Impact Statement that is including in Volume D of these documents. The
information is provided here for information but it the Contractor’s responsibility to satisfy
himself as the accuracy and completeness.
The following mitigation measures from Section 5.9.5.2 of the EIS, which conform to best
standard practice, are offered:

A programme of archaeological investigations/excavations must be undertaken with
respect to the bridge piers/foundations of the former bridge at Bray Bridge. This will allow
for the remains to be ‘preserved by record’, thus reducing the overall specific impact of
the scheme on such features. Ideally such work should be undertaken in advance of the
commencement of construction works.

A pre-development wading and metal detecting survey of the existing river channel within
the Zone of Archaeological Potential and at the confluence of Swan and County Brook
streams and in the area of Engineering Measure D9 (Debris Trap) should be undertaken
Page 58
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
in advance of the commencement of works. In the event that any possible features of
archaeological potential might be uncovered then the advice of the National Monuments
Section, Heritage and Planning Division, Department of the Environment, Heritage and
Local Government should be sought.

A pre-development metal detecting survey should be undertaken of the existing river
bank where it is proposed to undertaken ground reduction/excavation works.
These
areas are located along the southern side of Area 3 (Maltings Upstream and Glenwood
Areas), the northern (Coburg Estate and County Brook) and southern (Redhills) sides of
Area 4 and the southern bank of Area 5.

All topsoil stripping/general ground reduction works of the areas outlined in Item 3 above,
as well as all such works within the Zone of Archaeological Potential and Bray Golf
Course lands, should be monitored by an archaeologist. Such monitoring should be
complimented with continuous metal detecting in order to allow for an assessment of the
artefact bearing potential of the soil.

The removal of the top 300mm of river bed material from all of the area upstream of Bray
Bridge should be monitored by an archaeologist. It is noted that this material will be
stored for re-instatement (EIS Section 3.5.4).

In the event of archaeological features being uncovered during the course of such works,
then the advice of the National Monuments Section, Heritage and Planning Division,
Department of the Environment, Heritage and Local Government should be sought.

Reports describing the results of the works should be submitted to the relevant authorities
upon completion of the works. In that regard, funds should be made available for report
publication.
6.7.3
Architectural Heritage
The impacts with respect to structures of architectural heritage interest are outlined in Section
5.9.4.3 of the EIS. In that regard, it is not envisaged that the proposed scheme will cause any
negative impacts to any Protected Structures. The following mitigation measures are offered
with respect to Bray Bridge (Site CH-11) and Ravenswell Road Bridge (Site CH-12):

Extreme care should be taken during the underpinning works at Bray Bridge in order that
the existing structure/fabric of the bridge is not accidentally damaged by machinery.

Consideration should be given to the removal of vegetation on the facades of Bray Bridge
and remedial works such as re-pointing.
Page 59
Client:
Project Title:

Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
A full architectural survey of Ravenswell Road Bridge should be undertaken in advance of
the construction of the box culvert.
This should include both a measured and
photographic survey. This will allow for the feature to be ‘preserved by record’. Re-use
of the stone should be considered with regard to blocking-up the arch on the riverside
(southern) façade. In addition, a section/profile plan of the bridge should be undertaken
during construction works. Copies of the survey should be deposited with the NIAH, Irish
Architectural Archive and Bray Town Library for future study.

The stonework of the northern façade should be numbered and recorded on the survey
plans and consideration should be given to the reinstatement of this façade upon
completion of the box culvert.
Page 60
Client:
Project Title:
6.8
6.8.1
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
Landscaping Performance Parameters
Contractor’s Landscape Architect
The Contractor is required to employ a suitably qualified and licensed Landscape Architect to
The Contractor’s Landscape Architect will be
undertake all landscape design work.
responsible for reviewing the studies already undertaken and satisfying himself to the
adequacy of these studies and the recommendations thereof. The Contractor’s Landscape
Architect will be responsible for producing detailed landscaping plans that are sympathetic to
the project environs and take account for planning and landowner requirements.
A full
programme for landscaping works shall be submitted to the Employer’s Representative prior
to the commencement of any works. This programme will demonstrate how the landscaping
works are scheduled in conjunction with the construction works.
The Contractor must
account for the cost of all landscaping works in his tender price.
6.8.2
Landscape Design Standards
Landscape works are to conform to the current British Standards, particularly BS4428: 1989
for General Landscape Operations.
Landscape design, specification and subsequent
implementation of the works shall be undertaken according to best practice as far as is
practicable within the scope of the scheme.
In designing the landscape proposals the
Contractor shall comply with the requirements of An Bord Pleanála as set out in the
Environmental Impact Statement (EIS) and those of the Employer’s Representative.
All tree protection measures, vegetation clearance operations, planting and seeding works
shall be designed and programmed to the satisfaction of the Employer’s Representative in
advance of works commencing on site.
The Contractor shall be responsible for the
preparation and submission of approved method statements for associated works such as
handling, disposing and working in the vicinity of Japanese Knotweed as part of the design
phase of the works.
Tree protection measures, vegetation clearance operations, planting and seeding works shall
be designed and programmed to suit the appropriate seasons of working for the elements
involved according to best practice, current British Standards and the EIS. Tree protection
measures and vegetation clearance operations shall be designed to minimise existing
vegetation loss on site without unnecessarily restricting construction operations.
All soft
works design and specifications shall conform to the required British Standards, in particular
BS3936 for nursery stock trees and shrubs and BS5236 for planting of trees in the advanced
nursery stock category and the relevant standards as set out by the Horticultural Trades
Association.
Page 61
Client:
Project Title:
6.8.3
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
Tree Protection Measures
The Contractor shall be responsible for the preparation of detailed Tree Protection Plans to
inform the erection of temporary tree protection measures in the locations illustrated on the
specimen design. Tree protection measures to ensure Root Protection Areas of trees to be
retained must be adequately marked out and ring-fenced in advance of works commencing.
Suitable permissions shall be obtained by the Contractor as necessary to undertake the
works without restriction to the construction programme or seasonal windows available for the
works required.
6.8.4
Vegetation Clearance Operations
The Contractor shall be responsible for the preparation of vegetation clearance plans and an
accompanying programme to the satisfaction of the Employer’s Representative in advance of
works commencing. The plans shall clearly identify all vegetation to be removed and where
appropriate either cross reference the Tree Protection Plans or combine information. The
Contractor shall allow for sufficient site inspection time to agree the extent of the work with the
Employer’s Representative in advance of works commencing. The programme shall clearly
illustrate any seasonal restrictions including bird nesting season. Any periods required to
accommodate ecological input such as bat potential surveys or site supervision for section
felling shall also be clearly identified in the programme and resourced by suitably qualified
personnel.
6.8.5
Landscape Design and Specification
The planting design shall follow the principles and outline planting palette as set out on the
specimen drawings. Planting plans shall be developed by the Contractor including planting
schedules clearly identifying species, plant numbers, mix proportions, and nursery stock
specification sufficient to allow full implementation of the works to the satisfaction of the
Employer’s Representative. Planting specifications shall be sufficient to ensure adequate
supply, delivery, handling and planting of all nursery stock to allow the successful
establishment and development of the scheme to the satisfaction of the Employer’s
Representative.
Planting (or seeding) design shall allow for adequate supply and preparation of a suitable
quality planting medium such as topsoil or subsoil (where relevant for aquatic and marginal
vegetation in the river corridor or for wildflower seeding). Wherever practicable the design
shall allow for suitably excavated material to be utilised as planting medium (unless affected
by invasive weed species or excessive perennial weed population/seed bank).
The
Contractor shall be responsible for determining the suitability excavated material for each
respective use on site and shall demonstrate this suitability to the Employer’s Representative.
The design shall consider the import of compost to BS PAS100 to mix with suitably excavated
material of suitable quality to generate adequate volumes of planting medium fit for the
Page 62
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
purpose of the landscape elements proposed and to the satisfaction of the Employer’s
Representative.
Where topsoil import is required, topsoil shall conform to BS3882:2007
however import volumes shall be minimised in favour of use of suitably excavated material
wherever practicable. All planting medium shall be free draining but also moisture retentive
and adequately nutritious to sustain plant life. Topsoil analysis to be undertaken for all topsoil
imported to the site to determine the topsoil compliance requirement in accordance with
BS3882:2007 including contamination status assessment for potential deleterious impact on
human health, flora and the built environment.
Planting specifications shall allow for the supply of adequate means of nutrition to last for two
years after planting (subject to planting type and best practice requirements). Plants shall be
protected from rabbit damage for three years (where appropriate for inclusion in the design)
though protection shall not detract from the plant’s performance. Adequate support shall be
specified as appropriate for the planting design including underground guying for all semimature trees utilising an approved proprietary guying system to the satisfaction of the
Employer’s Representative. The Contractor shall provide additional construction details as
necessary to illustrate planting proposals, tree pit detailing, means of support, irrigation and
aeration facilities (for semi-mature trees) and all sundries associated with the planting works
in sufficient detail for approval by the Employer’s Representative.
In all locations where planting (particularly tree planting) is to be accommodated the
Contractor shall give due consideration to the eventual size, spread, root area and all
associated maintenance requirements during the establishment period and subsequent long
term maintenance (such as watering, pruning, thinning operations, replacement). The design
shall allow for provision of measures such as root barriers as appropriate to protect flood
defences, services, hard surfacing and other structures from future tree root activity. Where
vehicle access is required for maintenance purposes the paving leading up to the location
must be capable of withstanding loading and vehicle tracking.
6.8.6
Landscape Works
The Contractor shall work to enhance the landscape wherever possible within the scope of
the proposals as set out on the Specimen drawings. Hard and soft landscape elements as a
minimum shall meet the Employer’s Requirements and comply with the requirements of An
Bord Pleanála as set out in the Environmental Impact Statement (EIS). In particular, the
Contractor shall pay due regard to achieving high quality of finish to all hard landscape
elements, particularly where new flood walls are constructed; incorporate suitable terrestrial
works to encourage the recolonisation of the banks by riparian vegetation; and endeavour to
replace any existing planting removed for construction with local provenance native species
as appropriate to the location, prevalent site conditions and intended future maintenance
levels.
Page 63
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
6.8.6.1 General Landscape Operations
All tree felling and surgery; planting and seeding works shall be carried out to the satisfaction
of the Employer’s Representative by appropriately trained staff or sub-contractors, who are
members of an appropriate trade organisation.
All tree works to be in accordance with
BS5837 Trees in Relation to Construction and undertaken within the appropriate seasonal
windows with ecological supervision if deemed necessary and to the approval of the
Employer’s Representative.
All planting and seeding works shall be carried out at appropriate seasons when weather and
ground conditions do not threaten the successful establishment of landscape finishes or
nursery stock.
Any trees, plants or other landscaping works which do not satisfactorily
establish shall be replaced with material matching the original specification at the next
available seasonal window for the works required. Any trees or plants which fail shall be
removed and disposed of immediately and replacement made at the next appropriate planting
window.
All Plant material shall conform to BS3936 for nursery stock trees and shrubs and BS5236 for
planting of trees in the advanced nursery stock category. All plant delivery, handling and
planting of nursery stock to be in accordance with the guidance of the Horticultural Trades
Association. Plants should be supplied with an adequate supply of nutrients to last for two
years after planting. Plants should be protected from rabbit damage for three years. Damage
protection should not detract from the plants’ performance. A weed free area of 1 square
metre should be maintained around the base of each plant for a minimum of three years after
planting.
6.8.6.2 Japanese Knotweed and Notifiable Weed Species
The Contractor shall carry out works as appropriate to prevent the spread of notifiable weeds
and other noxious weed species such as Japanese Knotweed according to current legislative
requirements and Environment Agency guidance including the Knotweed Code of Practice
2007.
The Contractor shall follow their approved procedures according to the Method
Statements as produced during the design phase unless otherwise agreed with the
Employer’s Representative. All areas of Japanese Knotweed identified shall be clearly ringfenced with appropriate signage to identify the hazard to the satisfaction of the Employer’s
Representative. These areas shall be maintained as such for the duration of the works or
until such time as the area is cleared or treated to accommodate the works. The Contractor
shall be responsible for providing all site personnel with toolbox talks at the start of the works
to ensure all personnel are adequately briefed regarding the presence of Japanese Knotweed
and associated working procedures.
The Contractor shall also be responsible for the
completion of a programme of herbicide treatment using appropriately qualified personnel,
Page 64
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
materials and methods of application appropriate to the location and site constraints. This
treatment programme shall operate for the duration of construction operations and shall be
agreed in advance with the Employer’s Representative.
The Contractor shall undertake all necessary procedures to prevent the spread of Japanese
Knotweed by site vehicles and machinery used during the construction period including all
necessary provisions where wheel wash facilities are in use as stipulated in other sections of
this specification.
6.8.6.3 Vegetation Clearance and Protection
Other than the approved vegetation to be cleared as illustrated on the Specimen drawings, no
existing trees, shrubs or other plants shall be removed without the permission of the
Employer’s Representative and Local Planning Authority. No trees or shrubs shall be felled
or cleared within the bird-nesting season.
However, if additional vegetation clearance is
deemed essential within the bird-nesting season the Contractor shall obtain the prior approval
of the Employer’s Representative and the work shall be undertaken under the guidance and
supervision of an appropriately qualified ecologist if approval to proceed is granted.
The Contractor shall take all precautions to protect, in the course of their work, existing
vegetation from malicious or accidental damage and also ensure that no branches shall be
lopped and no roots over 50mm diameter are severed from vegetation to be retained adjacent
the works where no works has previously been specified. All works shall be carried out in
accordance with BS5837: Guide for Trees in Relation to Construction.
Tree protection
measures and locations as identified on the Specimen drawings shall be implemented and
maintained for the duration of the works without exception unless otherwise advised by the
Employer’s Representative. The Contractor shall be responsible for the implementation of
Tree Protection Plans to inform the erection of temporary tree protection measures in the
locations illustrated to ensure Root Protection Areas of trees to be retained are adequately
marked out and ring-fenced in advance of works commencing. The Contractor shall obtain
the services of an Arboricultural Association approved consultant as necessary to advise on
tree protection and Root Protection Areas.
All tree works to be undertaken by an
Arboricultural Association approved contractor in a manner that causes no adverse effects on
trees or vegetation to be retained adjacent the works.
No spoil, soil material, construction materials or rubbish shall be stored or tipped within 3m of
existing shrubs, hedges or the Root Protection Area or canopy spread (whichever is the
largest) of any trees. No fires shall be lit at any location within the works boundary. Tree root
damage and soil compaction shall be prevented by the use of tracking on approved haul
routes beyond the Root Protection Area of any trees or hedgerows to be retained in or
adjacent the works area. The Contractor shall submit proposals for approval and provide
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Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
temporary ground protection measures as necessary for any trees requiring protection as
identified by the Employer’s Representative.
6.8.6.4 Seeding and Planting Requirements for Establishment
The locations of all proposed grassed and planted areas including riverside and woodland
trees, specimen trees, native shrub, riverside edge planting, woodland understorey and
ornamental groundcover planting including plant species are illustratively shown on the
Specimen drawings. Any additional trees and vegetated areas which are lost as a result of
the permanent or temporary works are to be replaced by a size and species as agreed with
the Employer’s Representative and LPA. The requirements for illustrative purposes, of each
type of planting, are as follows:
Soft defences (i.e. of earth construction) and reinstatement of grassed areas shall be grass
seeded or turfed with a species mix and sowing rate appropriate to the site, function and
maintenance requirements to the satisfaction of the Employer’s Representative.
Local
provenance native species shall be considered and given priority wherever practicable.
However, due to the difficulties in sourcing local provenance seed (or seed mix for turf) the
Contractor shall consider the use of local or regionally sourced seed mixes in order to provide
a continuous grass cover free of pests, disease and predominantly free of perennial or annual
weeds.
The Contractor shall consider conventional or hydraseed application of seed as
deemed appropriate for the location and conditions. Grass cover shall be sufficient to provide
stability to slopes where situated on flood defence embankments. All other areas of grass
reinstatement shall establish sufficient ground cover to be deemed fit for purpose. Amenity
grass areas in parks, public accessible areas or private property shall achieve total ground
cover once established. Seeding of less formal river edge and naturalistic areas shall give
priority to the use of native species of local provenance including suitable wildflower or wet
grassland mixes. These areas are likely to establish much slower and total ground cover is
not essential in terms of a measure of successful establishment but should still be to the
satisfaction of the Employer’s Representative.
Structural planting including riverside and woodland trees and riverside shrub planting shall
comprise substantial blocks of native trees and shrubs. Plants shall be native and prevalent
in the area or as approved by the Employer’s Representative. Planting shall be dense using
predominantly smaller nursery stock (transplants) at 1m to 2m centres to achieve acceptable
establishment rates subject to ultimate design requirements and location. Planting shall be
either notch planted into prepared existing or made ground, or individually pit planted where
necessary. A proportion of larger whips, feathered trees and standards shall be incorporated
where appropriate to achieve early visual impact where screening function is desirable.
Nursery stock shall primarily be planted in bare root form (with the exception of gorse and
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Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
broom). All planting shall receive regular maintenance for the duration of the establishment
period and subsequently as set out in the LMP.
Specimen trees proposed for parkland locations including Peoples Park and Seapoint Court
shall be planted as semi-mature nursery stock (20-25cm girth). Each tree shall be supported
by underground guying and include a suitable irrigation tube with vandal proof cap. Nursery
stock shall be planted either root balled or from container or air pot grown. Tree pits shall be
of sufficient depth to accommodate the root ball of each tree and to dimensions and detail
(including backfill requirements) to be agreed with the Employer’s Representative. Individual
trees shall be planted straight and develop true to form with a balanced crown, strong centre
leader and be predominantly free of pests and diseases with no damage arising from
handling, delivery, planting or maintenance operations.
All planting shall receive regular
maintenance for the duration of the establishment period and subsequently as set out in the
LMP.
Riverside edge planting shall be planted directly into the reinstated top 300mm of the river
bed or adjacent river bank in the locations as illustrated on the Specimen drawings. Nursery
stock specification shall suit the required species and locations, and the Contractor shall allow
for any additional works required to accommodate plant material where optimum planting
depths are required for aquatic and marginal species (such as provision of planting ledges).
Planting shall be regarded as inoculation of the areas indicated on the Specimen drawings
with densities and coverage as appropriate to establish a viable population within reasonable
financial limits. All planting rates and areas to be agreed with the Employer’s Representative.
Ongoing establishment and vegetation development to be monitored in liaison between the
Contractor and the Employer’s Representative in order to agree and inform any re-planting
requirements during the establishment period.
Understorey woodland buffer planting and ornamental ground cover mixes shall be planted in
the locations as illustrated on the Specimen drawings.
Nursery stock specification shall
primarily be containerised stock with the exception of hawthorn in the woodland buffer mix
which can be planted in bare root form subject to seasonal constraints. Planting densities
and species combinations shall be appropriate to the location and function. Woodland buffer
planting shall provide an effective edge to the existing tree cover and planting locations shall
be selected to reduce competition from overhanging trees. All groundcover planting shall be
containerised and be planted at sufficient densities to readily achieve ground cover within 3
years of planting.
All ornamental groundcover mix planting shall be mulched using a
minimum 75mm depth ornamental bark mulch to reduce weed competition and improve water
retention throughout the planting area during the establishment period.
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Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
All arisings from planting operations shall be removed from site including plant crates, pots,
labels, packaging and any excess materials including topsoil and compost unless otherwise
directed by the Employer’s Representative. All planting operations shall be undertaken with
due consideration for prevention of pollution of the watercourse; residential and public access
to properties, footpaths, highways and other public areas affected directly or indirectly by the
works.
Private gardens, public and communal areas shall be reinstated to as near as
possible their pre-entry condition and to the reasonable satisfaction of the landowner.
Where the works directly affect private grounds or gardens, the Contractor shall liaise directly
with the landowner and/or occupier to ensure their requirements are taken into account during
the construction phase. An approved landscape architect and landscape contractor shall
undertake garden reinstatement where required within the scope of the works. Details of
plants shrubs and trees which will be removed as part of the Works shall be recorded in the
form of a schedule for each property by an approved horticulturist and equivalent
replacements, where possible, reinstated on completion.
6.8.7
Area Specific - Landscape Works
6.8.7.1 Area 1 – Harbour Bridge to Bray Bridge
The Contractor shall replace any areas of vegetation cleared to accommodate the works
within Area 1 with native species as scheduled and illustrated on the Specimen drawings.
General riverside planting to include aquatic and marginal species (Riverside edge and grass
planting Type A) and native shrub planting (Riverside shrub planting Type B).
All other
location specific planting is described below as individual landscape measures including
amenity areas, semi-ornamental and groundcover planting requirements.
Proposed soft
defences including the embankment along the southern edge of the river (and areas of earth
reinforcement) will be seeded using a suitable grass seed mix to establish grass cover and
stabilise the embankment face to the approval of the Employer’s Representative. Locations
suitable for planting of native shrub species (Type B) along the proposed embankment shall
be agreed with the Employer’s Representative. Planting locations shall be selected to ensure
there is no conflict with the stability of the flood defences. All proposed planting areas to be
seeded (in advance of planting works where feasible) to provide grass cover to planting plots.
Where new sections of stone clad flood defence walls are proposed along the river edge
within Area 1, aquatic planting (Type A) shall be implemented at intervals and in sufficient
densities to inoculate the regraded river bed and provide reasonable visual screening along
the toe of the structure. The Contractor shall agree the extent and location of all in-river
planting with the Employer’s Representative.
Golf Club Lands: In locations where trees and hedgerows are removed along the golf course
boundary to accommodate new wall and embankment construction woodland trees shall be
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Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
planted in locations and suitable densities to visually integrate the proposed structure along
the golf course side of the defences. The embankment shall be seeded with a suitable native
grass seed mix (in advance of tree planting where feasible). Topsoil or topsoil feathering over
subsoil shall be considered subject to grass seed mix used and agreement with the
Employer’s Representative. Between the proposed wall lines native tree and shrub planting
shall be accommodated as illustrated on the Specimen drawings with groundcover planting to
establish a low maintenance cover throughout. Tree planting shall be adequately detailed
and installed to allow for suitable drainage of the root zone and irrigation as needed where
trees are planted between the proposed retaining walls.
Groundcover to be planted in
combinations of single species groups to the approval of the Employer’s Representative.
Seapoint Court Defences: the Seapoint Court defences shall be landscaped to a detail agreed
with local residents and the Employer’s Representative including provision of a footpath with
railings as necessary to secure the river side of the path. Native tree and shrub planting
including riverside and woodland trees, and riverside shrub planting (Type B) shall be
incorporated along the footpath route to replace existing vegetation removed to accommodate
the works and provide a suitable setting for the pedestrian route. Parkland tree planting
(semi-mature Prunus avium ‘Plena’); understorey woodland buffer and groundcover planting
shall be included around the proposed lawn area (using a suitable amenity grass seed mix)
as illustrated on the Specimen drawings.
The Contractor’s design shall take due
consideration of public safety measures and landscape maintenance requirements
throughout. Riverside edge and grass planting (Type A) shall be implemented as illustrated
on the Specimen drawings to re-vegetate river edge planting within the channel following regrading works.
Abattoir Defences: Native shrub planting shall be implemented to replace any existing
vegetation removed to accommodate the works in this location. The Contractor shall allow for
and agree with the Employer’s Representative additional works as necessary to assist with
the tidy up of this location which has become derelict and overgrown.
Regrading of Riverbed: Riverside edge and grass planting (Type A) as illustrated on the
Specimen drawings shall be implemented in locations and at densities to the approval of the
Employer’s Representative to inoculate the river bed edges with the species as scheduled.
Planting shall be design and implemented to form natural communities, with random
combinations of single species blocks of planting sufficient to re-introduce and colonise
suitable aquatic and marginal species in these locations and to visually integrate the new
flood defence structures.
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Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
Site Compound and Temporary Landtake Reinstatement: Temporary landtake areas including
the site compound within the golf club lands shall be reinstated using a suitable grass seed
mix to the approval of the landowner and the Employer’s Representative.
6.8.7.2 Area 3 – Bray Bridge to the western edge of People’s Park
The Contractor shall replace any areas of vegetation cleared to accommodate the works
within Area 3 with native species as scheduled and illustrated on the Specimen drawings.
General riverside planting to include aquatic and marginal species (Riverside edge and grass
planting Type A) and native shrub planting (Riverside shrub planting Type B).
All other
location specific planting is described below as individual landscape measures including
amenity areas within People’s Park and the Maltings. Locations suitable for planting of native
shrub species (Type B) along the proposed defences shall be agreed with the Employer’s
Representative. Planting locations shall be selected to ensure there is no conflict with the
stability of the flood defences. All proposed planting areas to be seeded (in advance of
planting works where feasible) to provide grass cover to planting plots. Where new sections
of stone clad flood defence walls are proposed along the river edge within Area 3, aquatic
planting (Type A) shall be implemented at intervals and in sufficient densities to inoculate the
regraded river bed and provide reasonable visual screening along the toe of the structure.
The Contractor shall agree the extent and location of all in-river planting with the Employer’s
Representative.
People’s Park:
The mature trees to be removed to accommodate the works along the
southern boundary of the park shall be replaced with semi-mature (20-25cm girth) specimen
horse chestnuts (Aesculus hippocastanum). This line of trees shall be extended to the extent
as illustrated on the specimen drawings to provide a formal parkland feature along the full
southern boundary of the park adjacent the river. Tree spacing shall be regular and equal
with sufficient space to allow for the full development and mature crown spread of each tree
without the requirement for thinning. The adjacent footpath shall be fully reinstated following
completion of the works and areas of amenity grassland re-seed using a suitable amenity
grass seed mix to the approval of the Employer’s Representative. The Contractor shall allow
in the design for any suitable measures necessary to protect the flood defence wall and
reinstated footpath from future root activity and development (such as a proprietary root
barrier). Each tree shall be supported by underground guying (no aerial stakes or ties to be
used) and fitted with aeration and irrigation tubes to facilitate healthy growth and
maintenance. Riverside edge and grass planting (Type A) shall be implemented along the
toe of the proposed flood defence walls within the river to re-establish vegetation removed to
accommodate the works in this area.
The site compound and any areas of temporary
landtake within the park shall be fully reinstated to suit existing amenity grass cover.
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Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
Maltings Housing: Vegetation removed to accommodate the works in this location shall be
reinstated where appropriate with native shrub planting (Type B) within narrow (1500mm)
strips adjacent the river as illustrated on the Specimen drawings. Native woodland trees shall
be considered where appropriate to the location (primarily for measure C4). Riverside edge
and grass planting (Type A) shall be implemented along the toe of the proposed flood
defence walls within the river to re-establish vegetation removed to accommodate the works
in this area. The location, area and density of planting shall be agreed with the Employer’s
Representative.
Glenwood Excavation: Planting measures shall be incorporated similar to measures C4 and
C5 with combinations of native shrub planting (Type B) and riverside edge and grass planting
(Type A) to reinstate areas of vegetation removed to accommodate the works.
6.8.7.3 Area 4 – Western edge of People’s Park to La Vallee
The Contractor shall replace any areas of vegetation cleared to accommodate the works
within Area 4 with native species as scheduled and illustrated on the Specimen drawings.
General riverside planting to include aquatic and marginal species (Riverside edge and grass
planting Type A) and native shrub planting (Riverside shrub planting Type B). All landscape
measures comprise combinations of these treatments within Area 4 including measures D1-3,
D7-9. Individual measures are described below where additional issues are to be addressed.
Locations suitable for planting of native shrub species (Type B) along the proposed defences
shall be agreed with the Employer’s Representative. Planting locations shall be selected to
ensure there is no conflict with the stability of the flood defences. All proposed planting areas
to be seeded (in advance of planting works where feasible) to provide grass cover to planting
plots. Where new sections of timber clad flood defence walls are proposed along the river
edge within Area 4, aquatic planting (Type A) shall be implemented at intervals and in
sufficient densities to inoculate the river bed edge and reinstate areas of vegetation removed
during the works. The Contractor shall agree the extent and location of all in-river planting
with the Employer’s Representative.
Upper Dargle Road Residents Embankment: The Contractor shall consult with the residents
as necessary to agree landscape reinstatement along the proposed section of embankment.
Planting shall comprise native shrubs (Type B) as illustrated on the Specimen drawings
where riverside vegetation is cleared to accommodate the works. Planting locations shall be
selected to ensure there is no conflict with the stability of the flood defences.
Rehills Land:
The Contractor shall ensure that re-grading and import of soil material within
the fill area as illustrated on the Specimen drawings does not detrimentally affect existing
vegetation to be retained including woodland trees along the southern edge of the working
area.
Root Protection Areas of all trees along the work perimeter in this location to be
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Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
protected by tree protection measures as previously outlined. Reinstatement works to include
riverside edge and grass planting (Type A) including a suitable native grass mix for all regraded areas. Location, total area and density of planting in this zone to be agreed with the
Employer’s Representative. Planting shall be implemented to inoculate this area rather than
achieve total coverage. Woodland trees to be planted in dense, scattered individual blocks to
re-establish vegetation cover within native grassland in proportions to be agreed with the
Employer’s Representative. Planted plots shall be seeded with the same native grass mix (in
advance of planting operations where feasible) to provide grass cover throughout the
establishment period.
6.8.7.4 Area 5 – La Vallee to N11 Bridge
The Contractor shall replace any areas of vegetation cleared to accommodate the works
within Area 5 with native species as scheduled and illustrated on the Specimen drawings.
General riverside planting to include aquatic and marginal species (Riverside edge and grass
planting Type A) and native shrub planting (Riverside shrub planting Type B). Landscape
measures comprise combinations of these treatments within Area 5 including measure E2
which ties in with works to Area 4 (Rehills Land) including additional native woodland trees as
illustrated on the Specimen drawings.
Where embankment reprofiling requires, soft defences shall be re-seeded with a suitable
native grass seed mix to ensure establishment of grass cover to stabilise the slopes. Grass
seed mix, sowing rate and method of seeding to be approved by the Employer’s
Representative.
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Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
SECTION 7 – WORKS SPECIFICATION
7.1
General
Appendix 1 to the Works Requirements contains the General Works Specification for the
works. The Contractor shall reference this Specification in relation the required standards for
the materials and workmanship for the project. If there is an ambiguity between information
contained within any of the contract documentation the stricter interpretation of the
information shall apply unless agreed otherwise with the Employer’s Representative.
It is noted that working room is limited for most of the areas due to development adjacent to
the river, typical of the urban character of the watercourse. In some cases, work on the flood
defences will need to be carried out from the river, which will limit the periods of the year
during which construction may be carried out.
7.2
7.2.1
Compounds and Site Access
Access and Site Boundaries
Site Boundaries are as shown on the Specimen drawings and the Contractor will be provided
with the digital version of the CPO boundary to allow accurate setting out. The Employer will
provide reach agreements with all landowners to permit access for the Contractor within the
boundaries shown on the Specimen drawings. The Contractor may negotiate separately for
additional lands, accesses and site compound he deems necessary for the construction of the
works in accordance with his design and method of works. The Contractor must keep the
Employer’s Representative informed of all such negotiations and provided details of the
negotiated agreement.
Indicative access points to all the working areas are shown on the Specimen drawings
however no permissions have been negotiated with the affected landowners for these access
points. The Contractor must undertake negotiations for any access points to the river that do
not pass through lands which were subject to the CPO process.
All delivery vehicles supplying the site should be scheduled to miss the peak usage times of
the surrounding roads. Wheel wash facilities should be supplied at all access points to the
working areas, where they meet public and private roads.
The Contractor shall make
provisions as necessary for measures to prevent the spread of Japanese Knotweed in
relation to all wheel wash facilities at sites where the weed is present.
The Contractor is to ascertain the exact restrictions on the bridges from the Local Authority,
and design, plan and programme their works accordingly. The Contractor shall not allow any
vehicle, item of plant or similar, either belonging to themselves or their Subcontractors,
suppliers or visitors to park on the public highway or the verge thereto, or impede the use of
the said highway.
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Client:
Project Title:
7.2.2
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
Contractor Compounds
The specimen drawings indicate the location of three available areas for the location of site
compounds. The Employer will endeavour to provide at least the two areas shown in the
People’s Park as this land is owned by the Employer. However the third location is in third
party ownership and the Contractor must engage in consultations with this party to ensure
possession is granted.
Any other areas required by the Contractor will be subject to
negotiations between the Contractor and the landowners. The Contractor shall note that it is
not permissible to establish site compounds or material stores on public highways.
7.2.3
Notice of Entry
A formal notice of intention to commence the Works on each area of the Works will be given
by the Employer, to owners and occupiers of all the land as designated by the working areas
shown on the Specimen drawings. The notice shall be as long as is reasonably practicable
and will not normally be given less than 14 days before entry, other than in an emergency. To
this effect the Contractor will be required to give the Employer 4 weeks notice of their
intention to commence construction works in a particular section.
7.3
7.3.1
Site Facilities
Contractors Site Accommodation
The Contractor shall be responsible for leasing any land that may be required for locating his
offices and storage areas. The Contractor is responsible for all leasing, setting up, secure
fencing, temporary roads, demobilising, restoration costs, etc. These costs must be included by
the Contractor in his tender. The selection and use of land for leasing by the Contractor for
construction of the works must comply with all necessary permits for use of the land, and must
take cognisance of all access and traffic management requirements.
The Contractor is
responsible for all costs incurred for the installation, supply and removal of water, electricity,
telephone and any other services required at the site. The Contractor shall provide, maintain
and keep in good sanitary condition adequate sanitary accommodation for the use of all people
engaged on the Works, and shall remove, disinfect, and clear away on completion.
7.3.2
Site Accommodation for Employer’s Representatives Staff
Offices for the exclusive use of the Employer’s Representatives staff shall be located within the
Contractors secured site compound.
These offices shall be supplied and erected before
commencing construction works. The Contractor will be required to include in his rates for the
leasing of any land that may be required for the Employer’s Representatives offices and car
parking area. He shall also be responsible for the setting up, fencing, temporary roads etc.,
demobilising and restoration costs including the provision of a hard standing area and for the
provision of services to the hard standing area where the offices are to be located.
The
Contractor is responsible for the maintenance of the site accommodation, hard standing and
perimeter fence for the duration of the Contract.
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Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
Offices for the Employer’s Representative must be installed and have electricity (heating and
lighting), land line telephone, high speed broadband connection, answering machine, fax
machine and adequate fire fighting equipment, before commencing the construction works. The
offices shall be properly weathered with adequate ventilation. They shall be secure and the
Employer’s Representative shall be provided with keys to the external doors and all individual
office doors and lockable storage areas.
The Contractor shall provide, maintain and clean for the period of the execution of the Works
and remove on final completion or when directed, office and storage accommodation for the
exclusive use of the Employer’s Representative. Office accommodation shall be located on the
site and have the following:
(i)
Office area of not less than 36m².
(ii)
Storage area not less than 3m² for the Employer’s Representative’s
equipment.
(iii)
Kitchen area of not less than 6m².
(iv)
Dedicated meeting room to suits 10 people.
(v)
Separate toilet facilities with W.C., W.H.B with hot and cold water
services, soaps, towels, etc. Male and female facilities to be provided.
(vi)
Hardstanding for parking for at least eight motor vehicles for the exclusive
use of the Employer’s Representative’s Representative and his staff shall
be provided immediately adjacent to the site offices.
(vii)
3 No drawing cabinets for the exclusive use of the Employer’s
Representative and his staff.
(viii)
Office furniture and fittings, including 4 desks and 4 chairs, 1 meeting
table to suit 8 – 10 people and 10 chairs (in a dedicated meeting room) for
the exclusive use of the Employer’s Representative and his staff.
The Contractor should include in his tender for the provision and maintenance of the Employer's
Representative accommodation, services, equipment, office stationary, consumables and all
other operating and running costs for the duration of the contract.
7.3.3
No Residential Accommodation on Site
Caravans or other accommodation for residential use will not be permitted. The Contractor will
not be allowed to have staff or workmen living on any part of the Site.
In the case of
accommodation for Night Watchman or Security Personnel, such arrangements must be subject
to the Employer’s Representative’s approval. The Contractor shall ensure that no caravans or
huts are brought on to the Site for use as sleeping accommodation except as may be approved
by the Employer’s Representative and the Contractor shall ensure that all workers (except
security guards) leave the Site at the conclusion of each day. The Contractor shall obtain all
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Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
necessary approvals and permissions required for site offices and accommodation.
7.3.4
Cleanliness of the Site
Public roads used for access to and from the site and other areas shall be kept clean and
swept daily, or more frequently if required by the Employers Representative, to keep them
free from mud, dust and debris, as is reasonably practicable.
Existing public highways,
including footpaths, used by vehicles of the Contractor, their sub-contractors and suppliers
shall be kept clean and clear of all dirt, mud or other materials dropped by the said vehicles.
The Contractor shall make available at all times a road sweeper and other such plant and
equipment as may be necessary to keep the road clean as required by this clause or the local
authority or other interested party.
The working area, including the site compound for the Employer’s Representative staff shall
also be maintained in a tidy condition. The Contractor shall instruct all persons engaged on
the Site to use the sanitary equipment provided. Any person found disobeying this instruction
is guilty of misconduct and may be instantly dismissed from the Site by the Employer’s
Representative.
7.3.5
Electricity & Telecom Supply
The Contractor shall make his own arrangements for the provision of an adequate temporary
power supply, and back-up supplies for the duration of the contract. The Contractor shall satisfy
the Employer’s Representative, by production of any required “connecting up” certificates, etc.,
of the worthiness of any electrical installations. The Contractor shall install, maintain, and
disconnect on completion of the Contract, an electricity supply to the Employer’s
Representative’s site office.
7.3.6
Water Supply
The Contractor shall make his own arrangements for the provision of an adequate temporary
drinking / potable water supply, which shall be included for in his rates. The Contractor shall
pay all charges for the connection into the public main, where allowed, and for all water charges
during the course of the contract. The Contractor shall install, maintain, and disconnect on
completion of the Contract, a potable water supply to the Employer’s Representative’s site office
for use by the Employer’s Representative’s staff.
7.3.7
Sanitary Services
The Contractor shall make arrangements for the connection of the relevant sanitary services
to the sewer network, which shall be included for in his rates. The Contractor shall pay all
charges for the connection into the public sewer, where allowed, and for all charges during
the course of the contract.
The Contractor shall install, maintain, and disconnect on
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Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
completion of the Contract, a connection to the Employer’s Representative’s site office for use
by the Employer’s Representative’s staff.
The Contractor shall provide such sanitary equipment as may be considered necessary for
the convenience of the workforce to avoid fouling the Site or surrounding land. All sanitary
equipment shall be regularly cleaned and properly maintained.
7.4
7.4.1
Services and Equipment for the use of the Employer
Provision of Phones
The Contractor shall provide for the installation and maintenance of telephone equipment (3 No.
external lines) for the exclusive use of the Employer’s Representative staff for the duration of
this Contract. The equipment will include for 4 No. fixed extensions (at a minimum), 4 No.
mobile (GSM) phones and a broadband modem connection via a suitable router.
All line rental charges and call charges for the Employer’s Representative’s fixed line, mobile
telephones, fax machine, automatic telephone answering machine and broadband will be paid
by the Contractor for the duration of this Contract and for 4 months after the date of Substantial
Completion.
The Contractor will supply, install and maintain, for the duration of the Contract and for 4
months after the date of Substantial Completion a suitable digital Automatic Telephone
Answering Machine. The Contractor will supply, install and maintain, for the duration of the
Contract and for 4 months after the date of Substantial Completion a plain-paper fax machine
on a dedicated telephone line. The tender total is deemed to include removal of telephones,
modems, fax machines, and answering machine at the end of the contract.
7.4.2
Digital Camera
The Contractor shall provide two number digital cameras for the sole use of the Employer’s
Representative. This digital camera shall be 7 Mega Pixels or greater, with a minimum of 3 x
optical 4 x digital zoom with video function and sound, USB connectivity. The camera shall
come with the appropriate computer software and 4GB memory card.
7.4.3
Survey Instruments
The following survey equipment will be supplied and maintained under this Contract for the use
of the Employer’s Representative staff for the duration of the contract:
1 No. Total Station with tripod and 3-Prism reflectors.

2 No. quick-set levels (automatic levelling) and tripods. (N11 Wild or acceptable
alternative with circular scale).

4 No. 5 metre staffs (telescopic, graduated in metres etc. with level bubbles).

4 No. 8 metre steel tapes, nylon covered open frame type.
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Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114

4 No. 30m steel measuring tapes, fibre glass, B.M.I., in strong durable cases.

40 No. ranging rods, 2m long

2 No. 1m long spirit levels

A maximum / minimum thermometer, fixed to the exterior of the Employer's
Representative office.
The Contractor shall replenish these supplies over the duration of the Contract as directed by
Employer’s Representative.
7.4.4
Protective Clothing
The following shall also be supplied, for use by the Employer’s Representatives staff: 
10 No. pairs (sizes to be advised) Safety Boots.

5 No. pairs of waders (assorted sizes)

10 No. sets of protective, water-proof clothing.

10 No. White Hard-Hats

10 No Hi Viz vests
The Contractor shall replenish these supplies over the duration of the Contract as directed by
Employer’s Representative.
7.4.5
Attendance on the Employer’s Representative
The Contractor shall provide for attendance on the Employer’s Representative on site. This
shall be available on demand at all hours during which the Contractor is working on site. Such
labour and attendance may include:

Assistance in checking the setting out of the Works.

Assistance in measuring the Works.

Cleaning and maintaining the equipment provided to the Employer’s
Representative’s representative.

7.4.6
The provision of tools, pegs etc. for setting out and checking the Works.
Computer Equipment to be Provided
The Contractor shall include for the provision and maintenance of 4 no. of the following
computer equipment for the sole use of the Employer’s Representatives staff;

Pentium 4 3.2 GHz, 2 Gb RAM (min) Laptop Computer or equivalent

160 GB HDD

17” S.V.G.A colour screen

Integrated Two button mouse, keyboard and CD-RW/DVD-ROM, 100BaseT
NIC

External DSL Modem, Ethernet, 1.024Mbps

A3 / A4 Colour DeskJet Printer
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Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works

Windows 7 Professional

Microsoft Project 2007

Microsoft Office Professional

AutoCAD LT 2010

Anti-virus Software
Date: October 2010
Project No: Y9114
The Contractor shall provide consumable replenishment for computer equipment used by the
Employer’s Representative’s staff for the duration of the contract and for 4 months after the date
of Substantial Completion.
7.4.7
Site Vehicles
The Contractor shall provide 2 No. new 4WD Vehicles, Mitsubishi L200 Double cab, 2.5l diesel,
or equivalent, for the sole use of the Employer’s Representative staff for the duration of this
Contract. The Contractor shall maintain, tax, insure and provide fuel for these vehicles for the
duration of the contract and for 4 months after the date of Substantial Completion.
7.5
7.5.1
Surveys and Setting Out
Ordnance Datum, Pre-Contract Levels, and Reference Points
The levels referred to in the Specification and on the drawings relate to Ordnance Datum Malin
Head. All existing levels shall be verified on site by the Contractor prior to construction work
commencing. The Contractor shall establish and maintain reference pegs and temporary bench
marks of approved design appropriate for setting out and checking the works. Before removal
of any reference pegs or marks the Employer’s Representative’s approval must be obtained. All
surveys shall be referenced to the Irish National Grid and to Ordnance Datum Malin Head.
7.5.2
Topographical Survey and Setting Out
Existing topographical survey data of the site is shown on the Specimen drawings.
No
warranty is given as to the accuracy of the survey and the Contractor should satisfy himself of
the adequacy and accuracy of the data.
The Contractor shall verify the value of any
Ordnance Survey Bench Mark and grid system, which may be used in the design and setting
out of the Works. This is to be agreed with the Employer’s Representative.
The Contractor shall set out the works and notify the Employer’s Representative when setting
out is ready for checking with sufficient notice to enable him to carry out his own checks in
advance of the construction works commencing and to make any minor alterations to the route,
if required. The Employer’s Representative shall arrange for checking to allow the Contractor to
proceed with the Work. Any such approval given by the Employer’s Representative will not
relieve the Contractor of his responsibility to construct the Works adequately and accurately. In
connection with setting out the Contractor shall maintain on site all instruments, measuring
equipment, pegs, sight rails, and other things necessary for the proper setting out and checking
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Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
of the Works.
7.5.3
Line and Level
The Contractor is to design and construct the flood defences to the line and level indicated on
the specimen drawings. At the commencement of construction the Contractor shall mark out
the alignment of the Works Boundary line and the line of the proposed defences in all sections
of the Works as indicated on the specimen drawings. If deemed necessary the Employer’s
Representative may then make minor adjustments to the defences to suit the site conditions or
the Contractor may agree an alternative design with the Employer’s Representative.
The flood defences shall be constructed to achieve the levels shown after long term
settlement.
The Contractor shall indicate with their design how long term settlement is
assessed/ calculated and how it is to be monitored post construction. The superstructure of
the flood defences shall be constructed to the profiles, elevations and the aesthetical
appearance as shown on the specimen drawings or as describe elsewhere in these Contract
Documents.
7.6
Condition Survey of Existing Properties & Land
The Contractor is required to undertake a pre-construction and post-construction condition
survey of all properties and land adjacent to the Works Areas. These surveys are to be carried
out by a suitably qualified independent firm of engineers, whose details shall be submitted by
the Contractor to the Employer’s Representative for approval in accordance with Clause 5.4 of
the Conditions of Contract. The Contractor is to forward details of the company and CV of the
personnel carrying out the survey to the Employer’s Representative for approval. The full scope
of the properties to be surveyed shall be agreed with the Employer’s Representative.
7.7
Water for Works
All water required for the construction of the Works, testing of pipelines or for any other purpose
shall be provided by the Contractor, at his own cost.
7.8
Material Storage
Materials can only be stored in the compound areas secured by the Contractor or in fenced-off
work areas within the extents of the agreed wayleave. Material storage at roadside or in public
areas will not be permitted. The storage of dangerous compounds including contaminated
materials will not be permitted unless 24-hour security arrangements are in place.
7.9
Soil Sampling Excavation and Disposal
Suitable sampling and chemical analysis of the soil/subsoil will be undertaken prior to its
excavation. Any soil that is to be excavated and disposed of shall be sampled, analysed and
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Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
classified to determine the most suitable disposal outlet. Any soil that is to be reused on-site
shall be sampled and analysed to confirm its suitability.
7.10 Excavated Material
Disposal of surplus excavated material shall be the responsibility of the Contractor and shall be
carried out strictly in accordance with the Waste Management Act. The Contractor should note
in this regard that the regulations governing the disposal of excavated materials/builder’s rubble
require the transfer of such waste material only to sites authorised for the acceptance of the
material by the Environmental Protection Agency. The Contractor is required to maintain a
Disposal Record Log, in accordance with the Construction & Demolition Waste Management
Regulations, for examination by the Employer’s Representative, which will include the following
information for all disposed material:

The date the material was removed

A description of the material

The amount of material removed at that time

By whom the material was removed (Name and Company)

The intended destination of the material

Receipt for acceptance of the material
7.11 Ground Water Monitoring and Design for Ground Water
Groundwater levels are to be monitored in areas where sheetpile walls or cut-off measures
are to be installed.
A ground water monitoring programme shall be proposed by the
contractor for approval by the Employer’s Representative. This programme shall allow for
monitoring before, during and after implementation of the proposed flood alleviation
measures. The contractor’s design shall take account of existing ground water and suitable
measures shall be taken to prevent increase in ground water as a result of the proposed
works. The Contractor shall reference the Hydrogeological Report contained in Volume D of
Contract Documents and shall take account of the recommendations therein. The Contractor
is required to produce a detailed hydrogeological assessment for the scheme based in his
detailed design demonstrating the effect of the works on the hydrogeology of the surround
environment.
7.12 Reinstatement
7.12.1 General
Any lands or otherwise disturbed during the Works shall at a minimum be returned to there
original condition unless detailed otherwise in the Contract Documents.
7.12.2 Roads & Footpaths
All paving and surfacing materials shall be designed fit for purpose, easily cleaned and
detailed to allow for ease of repair. All hard-surface finishes to utilise high quality materials
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Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
and finishes to the approval of the Employer’s Representative in keeping with the aims of the
scheme. Paving and access design shall allow for pushchair and mobility impaired access
(including wheelchairs) and due consideration shall be given to surface finishes, materials
and gradients with respect to relevant building codes. Paving materials shall be designed
sensitively to visually integrate with the location utilising typically used local materials and
detailing where appropriate and/or matching paving as necessary to tie in to existing
footpaths and surfacing, particularly where reinstatements are required. Sections of new
footpath or surfacing should be designed with finishes and detailing appropriate to the setting
and context following consultation with all interested parties.
All restoration works are to comply with the requirements of the Department of the Environment
and Local Government Manual “Guidelines for the Opening, Backfilling and Reinstatement of
Trenches in Public Roads”.
Public roads affected by the works shall be reinstated in
accordance with Part M and Traffic Management Guidelines i.e. dropped kerbs/tactile etc. to
provide for mobility impaired road users irrespective of the status prior to the commencement of
the works.
The Contractor shall inspect the condition of all roads, including footpaths and verges either
public or privately owned, which will be used for access to the Site during the Contract Period
and shall agree their conditions with the Employer’s Representative and the appropriate third
party before the Contract commences. The Contractor, at their own expense, shall repair all
such roads, footpaths and verges upon completion of the Contract to a condition at least as
good as before the work commenced.
In the event of any interference with road markings, the Contractor shall arrange for immediate
replacement with temporary markings and to permanent markings restored as soon as is
practical.
Road markings shall comply with Clause 1211 of the NRA Specification for
Roadworks
7.12.3 Riverbed and Banks
Existing riverbed material shall be removed to a minimum depth of 300mm, stored and
reinstated to the exiting locations following regrading of the riverbed.
Suitable terrestrial
works should be considered to encourage the recolonisation of the banks by riparian
vegetation. Any planting or vegetation removed or damaged during the construction shall be
reinstated to a condition at least as good as before the work commenced.
7.12.4 Temporary Works Areas
The Contractor shall reinstate the surfacing of all site compounds and access routes on
completion of the Works. The Contractor shall clear the site and remove all site offices and
accommodation as soon as is practicable after completion of the Works on that part of the
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Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
Site. All temporary land take areas affected by compaction arising from construction activity
and operations shall be ripped where appropriate using suitable machinery to sufficient depth
necessary to alleviate any compaction.
Ripping shall be undertaken in advance of
reinstatement of topsoil profiles and landscape finishes. Topsoil profiles shall be reinstated to
match the profiles as they existed prior to the works.
Any boundary walls, planting or
vegetation removed or damaged during the construction shall be reinstated to a condition at
least as good as before the work commenced.
7.13 Operational and Maintenance Requirements
The future operational and maintenance requirements of the scheme shall be clearly set out
by the Contractor in the Proposed Maintenance Plan. The defences shall be designed to
ensure the following Operational and Maintenance Requirements are complied with:
7.13.1 Operational Requirements
The future operational requirement for the completed flood defence scheme shall include but
not be restricted to the following parameters:

The permanent access requirements are shown on the specimen drawings.

Pedestrian access to the bed of the watercourse where shown shall provide safe
access and egress for a labourer and a wheelbarrow and shall be at least 1.5m wide.

The existing vehicle access ramp off Dargle Road adjacent to Rivervale shall be
maintained to provide safe access and egress to the debris trap for a 15-tonne
tracked excavator leaving 0.75m clearance on each side of the excavator, maximum
gradient shall be 1 in 10.

All landscape elements shall be designed to allow suitable access for all associated
operational scheme maintenance activities including non-landscape maintenance
operations and third party activities such as Statutory Undertakers. Plant and tree
species shall be designed and located to prevent future conflict with accesses,
footpaths, roads, services, buildings or other structures as far as can be practicably
predicted.

Landscape design shall be appropriate to the location within the scheme with
reasonable establishment and ongoing maintenance requirements. Planting design
shall avoid inappropriate siting of proposed vegetation which might incur excessive
maintenance input or successive replacements.
7.13.2 Maintenance Requirements
Maintenance with the exception of landscape elements shall be limited to routine
maintenance (not required at a frequency greater than once a year) and major maintenance
(no more frequently that every 5 years). The defences should be designed to ensure that
maintenance is not required more frequently than as set out. Access for operations staff and
associated maintenance equipment should be provided. In particular access for Land Rovers
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Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
and ride on grass cutting equipment must be provided to all embankments of suitable gradient
to allow mowing. Allowance shall be made for cleaning of the silt trap at The Slang on an
annual basis and any other debris and silt accumulations from traps included in the scheme.
7.14 Use of Recycled Materials
The Contractor shall use his best endeavours to make maximum re-use of materials in the
Works.
The Contractor shall prepare a strategy to demonstrate how this will be
accomplished.
Opportunities for recycling shall follow “The reclaimed and recycled
construction materials handbook” (CIRIA C513: 1999).
The definitions of new (primary),
secondary and recycled materials shall be as follows:

New (primary) materials - basalt, clay, crushed rock, granite, gravel, limestone, sand,
sandstone, other stone, concrete (ready mix) and other naturally occurring materials.

Secondary materials - china clay waste, china/pottery etc, colliery spoil, combustion
residue, foundry sand, quarry waste, refractories, shale, slate waste, furnace slag
pulverised fly ash (PFA), furnace bottom ash, etc.

Recycled materials - brick, crushed concrete, glass, masonry, processed road
surface, etc.
Top soil should not be included nor materials that are reused on-site. Material that is moved
to another site should be counted. Beach nourishment materials that are taken from one part
of a beach, or offshore, should be recorded separately.
Percentage recycled materials = Secondary + recycled materials used
Total materials used
Expressed as a percentage to one decimal place.
7.15 Use of Sustainable Resources
The Contractor shall use best endeavours to use sustainable resources in the Works. All
timber and timber sheet materials shall be from a sustainable source. Materials which cannot
demonstrate this should not be used unless maximum supply of sustainable materials has
been sourced and the Contractor can demonstrate best endeavours to source sustainable
supplies. Sustainability should be demonstrated with the Forest Stewardship Council (FSC)
Chain of Custody (CoC) certification. Partial FSC CoC or other proof of sustainability may be
used with the prior written approval of the Employer’s Representative if it can be
demonstrated that the full chain is not available.
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Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
The Contractor shall consider the import of PAS100 compost (from approved sources only) to
supplement site won soil material for use as landscape growing medium where existing site
topsoil is not found to be suitable and topsoil import is required to complete the works.
7.16 Noise and Vibration
The Works are in a location that will affect many residents businesses and the general public.
Every effort shall be made to reduce noise and vibration through careful selection of plant,
screening and working hours. The Contractor shall ensure that the best practicable means
are employed to minimise the noise and vibration resulting from their operations and complies
with the recommendations and requirements of BS 5228: Code of Practice for Noise Control
on Construction and Demolition Sites.
In particular the Contractor shall ensure that;

All vehicles, plant and machinery used during the operations shall be fitted with
effective exhaust silencers and that all parts of such vehicles, plant or machinery shall
be maintained in good repair and in accordance with the manufacturers’ instructions,
and shall be so operated so as to minimise noise emissions;

Only ‘sound reduced’ compressors or other alternatives approved by the Employer’s
Representative shall be used, and any equipment or panel fitted by the manufacturer
for the purpose of the reduction of noise shall be maintained and operated so as to
minimise noise;

Any pneumatic operated percussive tools shall be fitted with approved mufflers or
silencers which shall be all kept in good repair;

Any machinery which is in intermittent use shall be shut down in intervening periods
of non-use or where this is impractical shall be throttled back to a minimum;

Stationary plant, e.g. pumps, compressors, generators, shall be situated as far as
possible from residential property and acoustic screens erected if required by the
Employer’s Representative.
Other plant and machinery shall be screened if
necessary;

Plant known to emit noise strongly in one direction shall be, where practicable,
orientated so that noise is directed away from noise-sensitive areas;

That as far as practicable their operations shall be not so noisy as to be a danger to
those on or about the Works or to be a nuisance to the neighbourhood;

If there are any especially sensitive residents, such as the elderly or people
convalescing, the option of providing alternative accommodation for the duration of
high-noise works is made available;

Where necessary the Contractor installs piles using ‘silent piling’ techniques.
Elsewhere the use of noise reducing hydraulic pile drivers and/or a non-metallic dolly
between the hammer and the driving helmet may be acceptable;
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Client:
Project Title:

Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
Use of air Noise monitoring is carried out at sufficient intervals and locations to
ensure that there is reliable data for management of the project in accordance with
BS 5228 procedures; and

That consultation is undertaken with residents to inform them of the duration and
timing of high noise works.
7.16.1 Vibration Monitoring
4 No. calibrated vibrographs shall be provided, maintained and operated on site at all times
during excavation works, piling and sheet-piling operations (if any). An operator skilled in their
use shall be made available by the Contractor during all such operations. Readings shall be
taken at various pre-selected locations during the Works. Locations will be selected by the
Employer’s Representative.
The Contractor shall provide for continual monitoring at the
adjacent structures and services during the course of the Contract, in particular during sheet
piling, excavation, rock removal and pumping operations.
Resultant ground wave velocities shall be limited to the following:
(i)
20mm /sec. at existing walls
(ii)
10mm/sec at any structure or existing service
7.16.2 Noise Suppression and Monitoring
The Contractor shall ensure that the level of noise resulting from the construction of the works
does not constitute a nuisance, and that noise emissions conform to the requirements of B.S.
5228: Noise control on construction and open sites. All plant shall be adequately silenced to
conform to the requirements of B.S. 5228.
The Contractor shall supply and have available during the course of the Contract 4 No suitable
and approved sound monitoring stations. The noise monitoring stations shall be provided,
maintained and operated on site at all times during excavation works, piling and sheet-piling
operations (if any). An operator skilled in their use shall be made available by the Contractor
during all such operations. The Contractor shall provide for continual monitoring during the
course of the Contract, in particular during sheet piling, excavation, rock removal and pumping
operations.
Noise restrictions shall be as follows:
Normal Working Hours:
Shall not exceed ambient background noise by more
than 10 dB (A) or shall not be greater than 65 dB (A)
whichever is the lesser, measured at equivalent
continuous sound level.
Outside Normal Working Hours:
55 dB (A) equivalent continuous sound Level and 40 dB
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Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
(A) equivalent continuous sound level between 11.00pm
- 8.00am
The noise levels given above shall apply at the fencing surrounding the work areas or at
adjacent residential properties as agreed with the Employer’s Representative. The Contractor
shall supply and have available during the course of the Contract suitable and approved sound
monitoring equipment.
Readings of background ambient noise and noise resulting from
construction operations shall be made from time to time, as directed by the Employer’s
Representative.
The Contractor will be required to use mains - powered (or approved
alternative) electric pumps and equipment outside normal working hours.
7.17 Pollution Control
The Contractor shall comply with all relevant environmental legislation. In particular, on no
account shall any contaminants, excavated materials or ground waters be allowed to
discharge or migrate into any watercourse, drain or highway. The Contractor shall be liable
for any prosecutions and costs associated with non-compliance including any charges made
in respect of watercourse pollution, destruction or disruption of any fishing interest or local
authority or private interest due to their activities. Advice on water pollution control and waste
regulation is available from the Environment Protection Agency's environmental information
officer and website.
7.18 Protection of Existing Services & Structures On, Under or Over the Site.
All necessary precautions shall be taken during the course of the works to prevent movement or
damage to any existing premises, outbuildings, walls, services etc.
The Contractor shall
indemnify the Employer against any claim for avoidable damage to existing structures / services
caused by his operations.
The existing services in the area include, but are limited to, the following:

Watermains

Foul sewers

Storm sewers

Telecom cables

Electricity Cables

Cable TV Ducts

Street lighting cables
The approximate locations of existing services are shown on the Utility drawings provided in
Volume D of the Contract Documents. It is the Contractor’s responsibility to confirm the exact
location of all services with the relevant service authority prior to commencing on site. The
Contractor is to liaise with the relevant Authorities to confirm the exact locations of any services
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Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
affected by the Works and to identify any constraints the Authority may impose.
Where the proposed works interfere with any existing services, it shall be the Contractor’s
responsibility to liaise with the relevant Authority regarding the exact location and depth of these
services and to ascertain their permanent protection requirements, if any. The tender total
should allow for complying with any protection requirements of the relevant Authorities. Any
pipes with less than 900mm cover to crown shall be protected by a suitable concrete surround
or other proposal.
Trial pits or slit trenches may be required to establish the location and level of existing services
in the vicinity of the proposed pipeline in advance of the Works. These shall be excavated by
hand, using air-operated tools as necessary and shall be done in conjunction with and to the
approval of the relevant Authority. No excavation by mechanically operated machines shall be
permitted, unless with the express prior approval of the relevant service authority and the
Employer’s Representative. The locations of the existing services encountered during these
investigations are to be mapped.
The Contractor is to ensure that construction traffic does not cross any existing services other
than at locations agreed with the relevant Authority, where the Contractor has carried out
temporary works, to the satisfaction of the relevant Authority, to ensure that no damage is
caused to these services by construction traffic
If it shall be necessary for services to be diverted or for works to be carried out on services
within or adjacent to the works, the Contractor shall be responsible for the proper timing and coordination of all work carried out by himself and by others in connection with service
installations, for providing attendance, for serving notices or keeping the service owners and
providers advised of the details of his programme for those parts of the works affecting their
installations. For this purpose, he will arrange for co-ordination/liaison meetings to be held on
site at approximately monthly intervals at dates and times agreed with the Employer’s
Representative and the Contractor shall be free, subject to the approval of the Employer’s
Representative, to hold meetings at shorter intervals if he considers it to be appropriate.
Throughout the duration of the works, the Contractors shall keep up to date records (and
produce drawings) of the position, size and type of all services encountered or affected by the
works and shall include these records with the Records of the Works as outlined in Clause
7.1.6.
The Contractor shall allow in his programme and tender total for all work or time
associated with service installations or diversions. The Contractor shall allow for all costs
associated with restricted working above, below, and in the vicinity of existing services.
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Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
7.19 Tributaries
The Contractor shall not obstruct the flood flow path of any tributaries such as to reduce the
flood defence level of service. This particularly applies to works on County Brook.
7.20 Maintenance of Public Rights of Way
The Contractor shall be responsible for constructing and maintaining safe accesses to all
public rights of way affected by both the temporary and permanent works.
7.21 Existing Land Drains & Culverts
The Contractor is responsible for locating, protecting and diverting (if required) existing land
drains and culverts in order to facilitate the Works. Costs associated with restricted working
above, below, and around existing drains, whilst ensuring adequate drainage of fields at all
times, is deemed to be included in the Contractors tender total.
7.22 Rock Excavation
The rates for rock excavation shall include for breaking out by hand or use of rock breaking
machinery subject to the restrictions on noise and vibration outlined in this specification.
Blasting will not be permitted.
7.23 Temporary Works
The design, fabrication and installation of all temporary works, necessary for the Works to be
constructed, shall be the responsibility of the Contractor. He shall submit detailed proposals
and drawings of such temporary works to the Employer’s Representative for comment. The
review of such proposals or drawings shall not relieve the Contractor of his total responsibility
for the adequacy or safety of such temporary works.
7.24 Records
The Contractor shall keep a record of all construction activities that could give rise to third
party claims. These records shall include details of ground vibrations during piling or similar
activities, road closures and obstructions, spillage of construction materials outside the Site,
other off site accidents, movement of heavy or wide vehicles, emission of odours and any
other activity or event that might give cause for complaint.
7.25 As Constructed Drawings
The Contractor shall prepare record details, at regular intervals throughout contract, updating
the Employer’s Representative’s original drawing in such a way as to show the actual
construction with all pertinent levels, measurements, construction details, or details of building
construction or installation for which he is responsible. Regular intervals shall be deemed to
mean every 3 months or every 500m of, whichever is completed first. Co-ordinates of the
centre-line of the pipe must be recorded and clearly shown on the drawings at maximum 20m
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Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
intervals and at all bends and fittings. These co-ordinates must be in Irish National Grid to two
decimal places. The Contractor shall submit such details to the Employer’s Representative
who, when satisfied that the drawings conform to the requirements of this Clause, shall arrange
for the completion of drawings for final presentation in the form of ‘As Constructed Drawings’ to
the Employer or his Representative.
This shall include survey information of the as-built
structures and details of services encountered.
7.26 Record of the Works
The keeping and maintaining of Works records shall form an important element of the Contract.
Records shall include the following, where applicable:

Pre-construction records: - records of services, levels, properties,
structures, roads and footpaths, sewer and other surveys etc.

Records of settlement and settlement monitoring.

Records of progress of the works, details of delays, etc.

Records of vibration and vibration monitoring.

Records of ground stabilisation works.

Records of concreting works.

Records of volumes of materials and types of materials excavated.

Safety records.

Quality control records.

“As Constructed” Records.

Records of any testing completed during the works.

Other recording as the Employer’s Representative may see fit, and
as may be necessitated by the Contractor’s method of working.
The Contractor shall allow the appropriate staffing resources to adequately keep and maintain
these records throughout the Contract. This shall consist of one technically trained member of
the staff, permanently based on site. The person(s) shall be proficient at use of computer
software for record keeping. The person(s) shall work on a continual basis with the Employer’s
Representative’s staff in recording the progress of the works. The procedures and measures to
be adopted shall be agreed at an early stage in the Contract. The records shall be kept in
digital format and appropriate computer software shall be used for storage of records.
Upon completion of the Works, the Contractor shall compile all records into an indexed and
referenced “Record of the Works”, suitable for handing over to the Employer. The “Record”
shall be supplied in paper format (3 number of copies), and in a suitable digital format. These
records shall become the sole property of the Employer.
Page 90
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
SECTION 8 – HEALTH AND SAFETY
8.1
General
The Contractors attention is drawn to the requirements in Clause 6.3 of the Instructions to
Tenderers – “Health and Safety Requirements”. The Contractor must comply with all current
health and safety regulations and in particular the Safety, Health and Welfare at Work Act
2005 and the Safety, Health and Welfare at Work (Construction) Regulations 2006.
A
complete list of Irish Health and Safety legislation is available from the Health and Safety
Authority, Publications Department, 10 Hogan Place, Dublin 2 or on the Health and Safety
Authority web site www.hsa.ie. Under the Safety, Health and Welfare at Work (Construction)
Regulations Contractors are required to appoint a competent Safety Co-ordinator from their
organisation for the duration of the contract. The Contractor must be prepared to accept this
responsibility and to allocate the necessary resources to comply with these regulations.
The Contractor shall comply with the "Guidelines for Working on Roads – Guide to the Safety,
Health and Welfare at Work (Construction) (Amendment) (No 2) Regulations 2008 (SI No 423
2008)" available from the above website.
The Contractor shall comply with all safety
instructions and guidelines issued by the ESB. The Contractor shall comply with all safety
instructions and guidelines issued by the Eircom.
8.2
Preliminary Safety and Health Plan
The Contractors attention is drawn to the Preliminary Safety and Health Plan which is
included with the tender documents. This document should be incorporated into the Safety
and Health Plan for the construction stage. The Safety and Health Plan for the construction
stage shall contain a signed copy of the Contractors safety policy. It shall fully consider the
contract restrictions and programming issues identified in this specification.
The Safety and Health Plan for the construction stage needs to be developed before the
commencement of the construction stage. It should, however, be continuously updated as
the site work progresses. This document then becomes part of the safety file at the end of
the contract period.
8.3
Emergency Arrangements – Contacts
The Emergency Contact List, in the Employer’s standard form shall include the names of at
least two responsible representatives of the Contractor and the telephone numbers at which
they can be contacted at all times outside normal working hours
Page 91
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
SECTION 9 – CONTRACTOR’S DOCUMENTS
9.1
Tender Stage
The technical assessment of the different proposals submitted by the individual Tenderers
requires the provision of a substantial level of detail in the tender submission. This section
provides details of the minimum information requirements to be provided by the Tenderers
with their submission and which will be used in the assessment of the technical merits of the
proposal. The information provided will also be used to determine whether the Tenderer’s
proposal is compliant with the Employer’s Requirements.
The information requirements
detailed herein are listed to ensure that the Tenderer provides details regarding specific
issues and topics that the Employer has identified as being of particular relevance to the
technical assessment of the proposals.
The Tenderer is required to present the requested information in a similar structure to the
detail provided below to facilitate the assessment of the proposal. Tenderers who consider
that their proposals contain features of particular merit, which would not be reflected by a
straightforward response to the detailed information requirements, are encouraged to provide
any relevant additional information. This additional information should be included within the
requested information requirements and presented in a manner compatible with the
structured layout provided by the inclusion of additional sections or sub-sections as
appropriate.
Tenderers are particularly advised that failure to present the requested information in a
structured concise and comprehensible layout may result in reduced marks being awarded for
the technical merit of the proposal. Specifically the Tenderer will not be given the benefit of
the doubt regarding his proposal if the details provided cannot be readily understood by the
Employer for reasons of lack of clarity or poor presentation.
The Tenderer is required to submit two hardcopies of his technical proposal, including A3
drawings as well as two PDF digit copies of the submission, including drawings. The Tender
Submission should be presented in four-ring presentation binders, the minimum number of
binders should be used, and individual sections should be printed double-sided.
The
Contractor is required to ensure that the digital copies of the submissions are referenced and
presented in the same clear format as the hardcopies.
9.1.1
Covering Letter and Executive Summary
A covering letter and executive summary is considered to be an important part of the
Tenderer’s Proposal, and consequently the Tenderer is required to provide these elements
within his proposal. The Covering Letter should be the central reference for the Tenderer’s
Proposals and should include the following elements:
Page 92
Client:
Project Title:

Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
Confirmation of the identity of the Contractor, constituent bodies, if any, and
subconsultants and subcontractors;

Summary of the basis for the Tender Proposal, by reference to the relevant
documentation, existing site conditions and any other relevant factors;

Confirmation that the submitted proposal is compliant with the Employer’s
Requirements and the Planning Requirements and other Statutory Approvals;

Identification of any deviations from the Employer’s Requirements, which should
be detailed in a separate section of the proposal;

Identification of any assumptions incorporated into the Tender Proposal as a
result of any ambiguities, or other factors, and which should be detailed in a
separate section of the proposal
The Executive Summary should be a concise summary of the technical details of the
Tenderer’s Proposal, and should be limited to approximately two to three A4 pages of text,
supplemented by no more than four A3 schematics. The Executive Summary should provide
details of the Tenderer’s technical proposals for both the Design/Build Works. The details
provided for the Design/Build Works should be concerned with identifying the works to be
constructed in each AREA of the site and the critical programme dates for this part of the
contract. The Executive Summary should not contain any details in respect of the financial
proposal or the Tenderer’s capabilities.
9.1.2
Documents to be Submitted at Tender Stage
The Contractor is required to submit the following documents as part of his tender proposal.
They will be used to award the qualitative marks as outlined in Appendix 6 to the Instructions
to Tenderers.
9.1.1.1 Proposed Programme
The proposed programme shall detail the design and the Construction Work identifying each
phase of the works separately. Furthermore it shall identify how the work will be constructed
taking account of the all the limitations and exclusion periods identified in the Works
Requirements and EIS and shall include a programme for landowner liaison and public
relations.
Programme shall also account for Employer's Representative's Design Review
periods and other such timescales identified under the Conditions of Contract.
The
Contractor’s attention is drawn to the layout and presentation details for the programme as
detailed in Section 4 of the Works Requirements.
9.1.1.2 Proposed Method Statement
The Contractor shall prepare a detailed method outlining his proposed methods of managing,
planning and constructing the works. Each phase of the works will be identified separately
and the MS shall outline how the Contractor plans to address all the limitations, requirements
Page 93
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
and exclusion periods identified in the Works Requirements and EIS. This MS shall be linked
to the work items outlined in the Proposed Project Programme and shall specifically address
the limitations and exclusion periods identified in the Works Requirements and EIS.
9.1.1.3 Proposed Traffic Management Plan.
With reference the Design Stage Traffic Management Plan contained in Volume D of the
Contract Documents the Contractor shall prepare a traffic management plan (TMP) outlining
his proposed methods of managing this element of the works. The TMP will identify each
phase of the works separately and shall outline how the Contractor plans to address all the
limitations, requirements and exclusion periods identified in the Works Requirements and EIS.
9.1.1.4 Mitigation of Environmental Impact
The Contractor shall provide detailed information on how his proposed design and
construction methodology has been devised to limit the impact of the works on the
environment. The information shall be project specific and shall identify each phase of the
works separately.
9.1.1.5 Proposed Public Relations Plan
This plan will identify who will be responsible for Public Relations, it will identify the propose
Public Liaison Officer providing details of his/her experience to undertake the role. The plan
will also provide details in relation to how the Contractor proposes to manage pubic relation
issues from Contract Award to Contract Completion. The plan shall make specific reference
to items such as public awareness, publicity and complaints procedures.
9.1.1.6 Proposed Design for the Flood Defence Walls
The Contractor shall provide drawings, material specifications, design philosophy and any
other documentation he deems necessary to demonstrate the Employer’s Representative
what his proposed design of the Works shall be. The Contractor is specifically required to
provide information regarding the architectural and visual finishes and materials proposed for
the project. Additional marks will be awarded for proposals to reuse/recycle materials and for
the use of materials and construction methods with reduced CO 2 emissions. The Tenderer is
required to confirm that his proposals for the Design / Build Works are compatible with the
existing Statutory Approvals for the Works. Alternatively the Tenderer is required to confirm
that he accepts the risk and responsibility associated with obtaining any required Statutory
Approvals and that he has included in his Tender for any associated costs.
9.1.1.7 Proposed Detailed Landscaping Plan
This item will be marked on the basis of a design package and drawings from a landscape
architect. The proposed design will take account of the requirements of the EIS and will aim
Page 94
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
to return the receiving to it original condition as soon as practical. The use semi-mature and
mature planting in place of saplings is preferred.
9.1.1.8 Proposed Maintenance Plan
The Maintenance Plan shall identify when and how maintenance will be required. It will cover
all items of the design from landscaping to architectural and structural elements.
It will
identify what inspections should be carried out, when these inspections should be undertaken
and outline a methodology for the upkeep of the various elements of the scheme including
how access can be gained to the various areas following the completion of the works. In
addition it will provide details on how elements of the scheme such as cladding can be
replaced in the event that they become damaged.
9.1.1.9 Detailed Methodology for Project Control
At a minimum this will identify the procedures for supervision of the construction phase,
communication with the Employer/Employer's Representative and proposed measures to
adequately integrate design and construction activities.
9.1.1.10
Methodology for Management of Safety during Construction
The Contractor shall provide details of how he plans to manage the project safely during the
construction phase including information on the proposed security arrangements for the
works.
The Contractor shall provide a written confirmation that the Contract Period is
adequate for the safe construction of the Works.
9.1.1.11
Project Quality Plan
The Contractor shall provide details of the proposed quality plan for the works.
9.2
9.2.1
Additional Information Required Prior to Tender Award
Pension and Sick Pay Scheme
It will be a condition of the award of this Contract that the main Contractor and all
sub-contractors (domestic or otherwise) appointed by him will be required to provide evidence
of membership of a Pension and Sick Pay Scheme, and to the satisfaction of the Employer
prior to the signing of a Contract.
9.2.2
Tax Clearance Certificates
In the case of a Contractor resident in the Republic of Ireland it shall be a pre-condition of an
award of contract that the Tenderer shall within a stated period produce a current Tax
Clearance Certificate or a Sub-Contractors C2 Certificate. Application forms (Ref. TC1 or
TC3) for such Tax Clearance Certificates may be obtained from the Local Authority.
Completed forms should be forwarded to the Office of the Revenue Commissioners, Sarsfield
House, Francis Street, Limerick.
Page 95
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
Non-resident Contractors and their proposed sub-contractors will require a statement from the
Revenue Commissioners of the Republic of Ireland that they are satisfied as to the suitability
for tax purposes of the Tenderer to be awarded a contract. They should apply to the Office of
the Revenue Commissioners, Nenagh, Co. Tipperary for this statement, which should then be
forwarded to the Local Authority.
The Contractor and all sub-contractors (domestic or otherwise) shall continue to hold, in good
standing, current issues of all such certificates for the duration of the works and the
maintenance period and until final payment has been made.
9.2.3
Health and Safety Requirements
The Contractor’s attention is drawn to the obligations arising under the relevant Clauses of
the General Conditions of Contract consequent upon the Safety, Health and Welfare at Work
(Construction) Regulations 2006 (S.I. No. 504 of 2006) and any amendment thereof (“the
Regulations”).
On the award of the Contract, the successful Tenderer will be appointed by the Employer as
Project Supervisor (Design Phase and Construction Stages) in accordance with the
provisions of the Regulations. The Contractor shall employ a Health and Safety Co-ordinator
for the design and construction stages pursuant to the provisions of paragraph 11(2) and 17
(2) of the Regulations.
The Tender Total shall include all costs which may be incurred by the successful Tenderer for
this contract in complying with its obligations pursuant to the Regulations, including the cost of
co-operating with the Project Supervisor (Design and Construction Stages) in co-ordinating
activities with other contractors and/or sub-contractors on site.
The Tenderer shall, if
requested, submit his Safety Statement pursuant to Section 20 of the Safety, Health and
Welfare at Work Act, 2005 to the Employer’s Representative.
9.2.4
Insurances
Prior to award of the Contract the Contractor shall provide details of the terms of the
insurance they propose to put in place or which they already hold and intend to use, to meet
the requirements of the Conditions of Contract. Where the insurance terms submitted for
approval provide for an excess sum i.e. a provision under which the insurer is not liable for
the first €XXXX of a claim or for claims below that figure, the Contractor must include with a
statement undertaking responsibility for dealing with third party claims, or parts of such claims
within the excess amount.
Page 96
Client:
Project Title:
9.3
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
Design Build Works
9.3.1
Contractor’s Documents for Acceptance
The Contractor shall submit detailed designs and drawings for acceptance by the Employer’s
Representative after the Contract is awarded. Details of the form of submission, recipients,
programme for submission etc shall be agreed at the start-up meeting following contact
award. Although electronic submission is anticipated, the contactor shall provide up to two
hard copies of submissions at no extra cost if requested to do so by the Employer’s
Representative.
The Contractor shall design and fully detail the Works to ensure they are constructed in an
efficient and co-ordinated manner. The Contractor shall not commence any construction work
until the relevant Contractor’s Documents have been submitted to the Employer’s
Representative for comment and no comments have been given or the time specified for such
has expired.
All drawings submitted to the Employer’s Representative shall be thoroughly checked by the
Contractor before submission.
Information submitted by the Contractor shall include the following:
 layout plans of the proposed works with leading dimensions;
 general arrangement drawings of all principal components of the Works including
plans, sections and elevations;
 Design calculations.
The Contractor shall continually update the Contractor’s Documents throughout the design
and construction stages to record all changes and developments in the designs.
9.4
As Built Contract Drawings
The Contractor shall prepare ‘as-built’ drawings for the schemes in .dwg format to suit
AutoCAD and in .pdf format. As built drawings shall include works below ground such as:
service crossings, areas where weak ground is replaced, location of diverted services,
obstructions to piling, location of walls and culverts whether left in place or not, change in
detail of works below ground, unidentified services etc. As built drawings shall be produced
using coordinates referenced to Irish National Grid. The Contractor shall supply draft .pdf
sets of the ‘as-built’ drawings to the Employer’s Representative for review and on acceptance
of these the Contractor shall supply the final .pdf and .dwg copies as well as a full set of the
final hardcopy drawings.
Page 97
Client:
Project Title:
9.5
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
Handover and Completion
To ensure that the Employer’s staff are fully conversant with the scheme before handover, a
structured handover process is required. This shall include a Handover Plan defined below, a
handover workshop and training of the Employer’s staff if required.
9.5.1
Handover Plan
The Contractor shall submit a handover plan to the Employer’s Representative at least six
weeks prior to the anticipated completion date for the scheme. This shall comprise:
 The Maintenance Management Plan including the Landscape Management Plan
element
 Details of the handover workshop and other training to be provided including handouts
and proposed dates
 Health and Safety information
 As built drawings
9.5.2
Handover Workshop
A handover workshop shall be held at each scheme a minimum of two weeks prior to
anticipated completion. This shall include:
 A familiarisation tour of the scheme
 An overview of the environmental and landscape elements in terms of design intentions
relating to long term maintenance and management
 Training in the operation of mechanical and electrical plant for operations staff if
applicable.
 An overview of the information held in the Health and Safety File, the maintenance
management plan and any operation and maintenance manuals
 Any unusual or innovative elements of the scheme described by reference to the as
built drawings
The handover workshop shall take place before, and shall be a condition precedent to,
completion of the scheme.
Page 98
Client:
Project Title:
Bray Town Council
River Dargle Flood Defence Works
Date: October 2010
Project No: Y9114
SECTION 10 - TITLE
No items at present have been identified for retention by the client. The client reserves the
right to identify and retain title on materials during the course of the contract. This shall be
done in writing by the client.
Reuse of materials as much as possible is encouraged. Natural stone forming existing walls
and parapets etc should be reused and incorporated back into the finished works as far as
practicable.
Page 99