20.3780 Malahide Marina Dredging 20.3780-VO-VOM-PR-0010/01 Revision A Method Statement – Water Injection Dredging Page 1 of 20 eDOCS no. SAWP-#3318804 VOMS-PR2.04-TE-03-10 METHOD STATEMENT Malahide Marina Dredging A First Issue 12-03-2018 LCH MHE JBW Revision Description Date VO Originator VO Checked VO Approved Approval Client Document number Client: Document number Contractor: 20.3780-VO-VOM-PR-0010/01 For inspection purposes only. Consent of copyright owner required for any other use. EPA Export 07-04-2018:04:10:14
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203780 - Method Statement - Malahide Marina Dredging · The dredger is to be mobilised via road to Malahide Marina in Malahide, Ireland. On arrival the dredger will be assembled on
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Revision record Revision Number Description Date A First Issue 12-03-2018
External referenced documents
Supporting documents Document Number Document Name VOMS-PR1.02-OD-01 Van Oord Management System QHSE-PSU-001 Project Risk Assessment Database (PRADA) QHSE-MAR-PU-300 Risk Assessment Tool (RAT) Marine Floating Equipment VOMS-PR1.10-TE-01 Template Risk Assessment VOMS-PR2.04-TE-09-03 Template Inspection and Test Plan (ITP) VOMS-PR2.04-TE-10-01 Template Work Instruction 20.0000-VO-VOM-PR-0001 Project Management Plan 2018 (including all supporting
documents)
Distribution list Dredger Crew Superintendent / Works Manager Client (hardcopy) Licensing Authorities
3.2.1 Principles of Water Injection Dredging ................................................................................ 83.2.2 Scope of works .................................................................................................................... 8
4.1 Organisation .......................................................................................................................... 104.2 Tasks and responsibilities ..................................................................................................... 10
5 Quality ............................................................................................................................................ 126 Health and Safety ........................................................................................................................... 13
6.1 Risk Assessment ................................................................................................................... 136.2 Personal Protective Equipment ............................................................................................. 136.3 Site Specific Risks ................................................................................................................. 14
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Abbreviations and definitions
Abbreviations
EMP Environmental Management Plan HSE Health, Safety and Environment HSSMP Health, Safety, Security Management Plan ITP Inspection and Test Plan ITR Inspection and Test Record JSA Job Safety Analysis LMRA Last Minute Risk AssessmentMS Method Statement PPE Personal Protective Equipment PQP Project Quality Plan PRADA Project Risk Assessment DatabasePTW Permit to Work QA/QC Quality Assurance / Quality Control RA Risk Assessment RAT Risk Assessment ToolSOC Safety Observation Card SWP Safe Work Practice VOMS WID
Van Oord Management System Water Injection Dredging OR Water Injection Dredger
Definitions
Client Malahide Marina Village Ltd
Engineer NA
Contractor Van Oord Ireland Ltd
Sub-Contractor NA
Method Statement A method statement (sometimes referred to as work method statement or safe work method statement) is predominately used to describe specific instructions on how to safely perform work related tasks and activities.
If applicable (e.g. as a result of contractual requirements), method statements are to be submitted during the preparations of the project for approval by the client or their representative.
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1 Scope This chapter provides a general project description and the scope of work covered under this method statement including the requirements.
1.1 Project description Maintenance dredging is required at Malahide Marina for safe navigation of vessels. An estimated 17,000m³ of silt is required to be removed using Water Injection Dredging. Dredging is required over an initial campaign in Nov-Jan 2018/2019. Two subsequent campaigns in Nov-Jan 2021/2022 and Nov-Jan 2024/2025 are required. Volumes of the 2nd and 3rd dredging campaign will be assessed prior to commencement of operations.
Van Oord is the leading contractor in the dredging technique called ‘Water Injection Dredging’ (WID). This hydrodynamic dredging technique uses the natural dynamics of the system where the horizontal transport takes place in the water column. The Tidal and river current, together with the gravitational effect, transport the dredge material out to sea. This sustainable dredging technique developed by Van Oord eliminates the need for traditional dredging techniques and is a lot more cost effective.
The variety and in general small size of these projects still require the Van Oord standard and comply with all Irish laws and regulations.
The Project Management Plan (including all supporting documents) is set up as one overall covering management document. It covers all the running, and future, stand-alone maintenance Water Injection Dredging projects in Ireland executed by Van Oord Ireland Ltd. The scope of works include maintenance dredging in rivers and canals and at locks, docks and jetty’s varying from large Ports and Harbours to small Marina’s.
1.2 Scope method statement This Method Statement is made for the WID activities in Malahide Marina and falls under the overall WID Ireland Project Management Plan. The various dredge locations are outlined below.
November / January • Campaign 2018/19 – total estimated 17,000m3 to be removed • Campaign 2021/22 – total estimated tbc m3 • Campaign 2024/25 – total estimated tbc m3
As agreed with the Harbour Master, various locations within the Harbour will be dredged using Water Injection Dredging. The WID Borr [or equivalent] will be mobilised for the works.
This Method Statement has developed and will be implemented with the health, safety and welfare of all personnel, the public, wild life and the environment being of utmost priority.
The content of this Method Statement is to be verbally communicated to the workforce involved by the Superintendent the day prior to the task commencement, this ensures that the correct personnel, tools and equipment are in place and gives enough time for suggestions or additional control measures identified during the briefing to be included within the Method Statement.
Where required the activities will be re-briefed in the form of a toolbox talk on the day of the activity, to ensure that the requirements are fully understood. Feedback from the workforce is encouraged.
1.3 Requirements For the requirements applicable to the scope of work covered under this method statement reference is made to the following documents:
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# Requirements sources Reference
01 Inspection and Test Plan (see appendices) VOMS-PR2.04-TE-03-09-03
02 Legal Register Ireland 20.0000-VO-VOM-PR-0007
Van Oord will execute the scope of works in line with the contractual requirements, applicable law and applicable International Guidelines and Standards.
1.4 Objectives, targets and indicators For the objectives, targets and key performance indicators applicable to the project including the scope of work covered under this method statement reference is made to the information provided in the Project Management Plan 20.0000-VO-VOM-PR-0001.
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3 Methodology This chapter describes the approach how the scope of works covered under this Method Statement will be realised and stipulates the preparation works, execution method and planning.
3.1 Preparation The dredger is to be mobilised via road to Malahide Marina in Malahide, Ireland.
On arrival the dredger will be assembled on the quay and lifted in the water in its entirety. The lifting operation will be carried out by a mobile crane. To lift the vessel a heavy crane will be required with the capacity to lift 62T. The lifting process will be planned and supervised by a Van Oord appointed person in close cooperation with the local Authorities. All lift plans, waivers and risk assessments will be put in place before the lift is undertaken. The reverse process will be carried out for the demobilisation of the crane at the end of the job.
3.2 Execution
3.2.1 Principles of Water Injection Dredging
Van Oord Ireland is the operator of the dredging system known as Water Injection Dredging. The Water Injection Dredging system is unique in its design to remove silty material from the seabed. A jet bar is moved over the surface of the seabed while the nozzles inject large volumes of water at low pressure into the sediment layer.
The density of the soil layer is lowered until it shows fluid behaviour. The fluidized sediment layer is then transported horizontally in the lower part of the water column away from the dredged areas. The hydrostatic pressure difference, the gradient of the seabed and the tidal and current flows are the main driving forces for this natural horizontal transport. In most cases the fluidized sediment will finally re-enter the water column in a high energy environment where it will be mixed with other naturally occurring sediment particles. From there on the sediment continues its natural route towards its original destination.
The WID process explained in 6 minutes: https://www.vimeo.com/69300630 [no login required]
3.2.2 Scope of works
Deposited fine silts within the various dredge locations will be dredged on the Broadmeadow River estuary. The dredged material will be transported using flow channels to the deeper area within the Harbour and dispersed over the ebbing tide out to sea. A total of 40 tides of dredging is anticipated, with the aim to remove 17,500m3 of silt.
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The flow channels are indicated in red. The dredger will remove the material from in between the finger pier pontoons towards the flow channels. In yellow the movable marina pontoons are indicated. The marina pontoons can be moved to facilitate the ease of dredging and significantly reduce the dredging time required.
3.3 Planning Mobilisation on site will be on a date as agreed with the Client.
Based on the envisaged workload of dredging 40 tides we anticipate to have the works complete within 20 days. The total operation including mobilisation and demobilisation is expected to take approximately 24 days. Operations will be carried out on either tides (consisting of a 6 hour period on the ebb tide, including setup and mooring up).
Our site representative Farrell McCullough or Lizzie Chellew will have a daily meeting with the Port Engineer to discuss progress of the works and planning.
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4 Organisation This chapter describes the personnel involved in the realisation of the scope of works covered under this Method Statement and provides information on the organisation, roles and responsibilities.
For the overall project organisation reference is made to the Project Organisation Plan <20.0000-VO-VOM-PR-0002>.
4.1 Organisation
4.2 Tasks and responsibilities The general project roles and responsibilities of the key personnel as part of the project team are provided in the Project Organisation Plan <20.0000-VO-VOM-PR-0002>.
The specific tasks and responsibilities of the project staff, crew and labour directly involved in the activities covered under this Method Statement are described below and in the appendix Work Instruction in case applicable.
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Tasks Description Responsible
Is responsible for the delivery of the operational phase of the project, provides the project team with hierarchical leadership and ensures compliance with the safety regulations and checks.
Operations Manager
Provides project team with operational leadership, draws up the work plan, informs and instructs the Captain and the survey team with respect to their duties, ensures all relevant persons are kept fully informed about construction status and ensures compliance with safety regulations
Works Manager/ Superintendent
Overall command over the vessel (overriding authority), manage the vessel and crew on behalf of the owner/ operator in an efficient and economical manner, taking in account safety and environmental issues for all operations. Plan, prepare and execution of marine operations and navigation, final responsibility for the safety of the ship, it’s crew and all personnel on board. Has the authority to stop all operations which are not executed in a safe manner and/or endangering the vessel and its crew.
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5 Quality This chapter describes all quality aspects directly related to the scope of work covered under this method statement.
For the overall project information on the quality aspects reference is made to the Project Quality Plan <20.0000-VO-VOM-PR-0009>.
A pre-survey will be provided by the Client. This data is used to plan the dredging operations as described in previous sections. The survey data will also be available onboard the dredger, where it is updated with the position and depth of the bar, so that the dredger can keep track of where it has worked.
All dredgers use a contracted online system to receive RTK – Water level information and correction.
Every day a screen dump is made of the dredging tracks to provide both the Client and the project team a visual overview of the works carried out each day. The screen dumps are supported by daily reporting. An example screen dump is shown below.
Upon completion a post dredge hydrographic survey will be organised by Hydrographic Surveys Ltd (by the Client).
As part of this Method Statement an Inspection and Test Plan (ITP) has been prepared in line with the Project Quality Plan. Further reference is made to the ITP (VOMS-2.04-TE-03-09-03) in the appendices.
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6 Health and Safety This chapter describes all health and safety aspects including hazard identification, risk assessment and applicable Personal Protective Equipment related to the specific scope of work covered under this method statement.
For the overall project information on health and safety reference is made to the Project Health Safety and Security Management Plan <20.0000-VO-VOM-PR-0004>.
6.1 Risk Assessment Prior to the start of an activity covered under this Method Statement a Risk Assessment (RA) will be carried out in order to identify risks and if necessary mitigate risks to an acceptable level.
The Risk Assessment(s) will be discussed and communicated to persons involved prior to the start of works and fully documented. Attending persons will be asked to sign the Risk Assessment to confirm their attendance and understanding of the briefing.
Reference is made to the Risk Assessment (VOMS-PR2.04-TE-03-09-03) related to the scope of work covered under this Method Statement in the appendices.
All mitigation measures described in the Risk Assessment(s) enclosed shall be in place before start of the work.
6.2 Personal Protective Equipment Mandatory Personal Protective Equipment (PPE) within Van Oord as a minimum are:
Mandatory PPE
Approved safety footwear
Hard hat / safety helmet
High visibility clothing (jacket or coverall) with
long sleeves
Life jacket (when working near or over the water and during
boat transfer)
Certain specific tasks and activities covered under this Method Statement may require personnel to wear job specific PPE.
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6.3 Site Specific Risks Site specific risks at the site include the following:
• Weather conditions It is anticipated that the works are not affected by the weather conditions (wind or swell), and conditions that do impose hinder of the works can be absorbed in the planning.
• Shipping / traffic within the port During the kick-off meeting our Superintendent will discuss the planning with the Harbour Master and contacts will be made with the local fisherman via de Harbour Master
The full risk assessment can be found in Appendix 5.
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7 Environment This chapter describes all environmental aspects related to the scope of work covered under this Method Statement including requirements, impacts, control and monitoring measures.
For the overall project environmental information reference is made to the Project Environmental Management Plan <20.0000-VO-VOM-PR-0005>.
Anywhere known to consist of contaminated material will not be dredged or levelled using water injection. If contaminated material is suspected whilst working is being undertaken, operations will be suspended and an investigations will be carried out.