20130517 Fairbourne FRMS - Method Statement - Morfa Friog v2€¦ · 1.0 Scope of the Works: This...

METHOD STATEMENT

Ref:HS&E-FRM-H03-02 Issue 2 Revision 00 Date: May 2013 of 11

Contract Title: Fairbourne FRMS – Morfa Friog Saltmarsh Habitat Creation Scheme

Contract No: MS Reference:

Subject: Morfa Friog 6705 6705 / 04

Author: Paul Corner

Date Produced: 29th November 12 Revised : 23rd May 13

1.0

Scope of the Works:

This outline method statement covers, Removal of sections of embankment and a dune ‘scrape’ on existing land at Morfa Friog. This Method Statement is to be read in conjunction with the appended scheme drawings: 109448/03 – General Arrangement 109448/03 – Sections and Details

2.0

Date(s) to be Carried out:

July / September 2013 Working times 8.00am – 6.00pm Monday to Friday

3.0

Precise Location:

FAIRBOURNE FRMS – 6705 – Morfa Friog Saltmarsh Habitat Creation Scheme

Morfa Friog

4.0

Access / Egress & Deliveries:

All access to the works to be via Fairbourne town, coast road (Beach Road, and Penrhyn Drive North)

Protective aluminium trackway and stone (on geotextile) ramps will be used to protect ground within the site from damage

5.0

Methodology:

See Main sections / methods of work & General issues

METHOD STATEMENT


6.0

Significant Health, Safety

Interface with public / closing public access to the works Overhead / underground services known electric, gas and telecoms Heavy plant and machinery, traffic management Dealing with water Working on embankment slopes

7.0

Risk Assessments Attached:

Risk Assessment to be developed with H&S method statements

8.0

COSHH Assessments Attached:

Risk Assessment to be developed with H&S method statements

9.0

Personnel:

Project Manager & Site Manager - CSCS Foreman & Engineers - CSCS Plant Operative – CSCS / CPCS General Ops - CSCS

10.0

Plant &

Equipment:

20t Excavator D6 Bulldozer 10t dumpers 20t Road lorries (tipping) Aluminium Track way

11.0

Materials:

Imported aggregates will be free from non native invasive species (a bio-security risk assessment will be followed).

All excavated / generated / imported materials arising from works will either be re-used within the Fairbourne FRMS or will be disposed of at licensed tipping sites. No materials will be given to third parties.

Arthog Quarry Aggregate - Road stone (access ramps). Geotextile – as protection beneath access ramps and as ground protection

strips adjacent excavation works. Aluminium trackway – as ground protection / haul roads. Site won stone – as protective rock armour to reinforce exposed stubs of

embankment at breach points.

12.0

Communication &

Responsibilities

To be highlighted within Construction Phase Health & Safety Plan.

13.0 Temporary

Works:

Laying of protective aluminium trackway and access ramps, and temporary installation of site toilets / welfare unit.

14.0

Emergency Procedures:

All Supervisors to have mobile phone, contact for emergency to be 999. Bronglais General Hospital (Major A&E)

Caradog Road, Aberystwyth SY23 1ER : 01970 623131

Dolgellau and Barmouth Community Hospital Hospital Drive Dolgellau LL40 1NT : 01341422479

15.0 Permits to

Work Required:

Confined Space Entry (HS&E-FRM-C02-01) N

Diving (HS&E-FRM-D02-03) N

METHOD STATEMENT


Electrical (HS&E-FRM-E01-01) N

Break Ground (HS&E-FRM-E02-03) Y

Hot Works (HS&E-FRM-F01-03) N

Work At Height (HS&E-FRM-W03-02) N

Temporary Works N

Pumping (HS&E-BPG-W05-101) N

16.0

Hold Points:

Planning permission & discharge of conditions EAP – Environmental Action Plan to be finalised NRW consent working methods Register with EA flood risk management team Pre-condition surveys Prepare Environmental risk assessment Notify local emergency services, coast guard Environmental site visit with in house environmental specialist Habitats regulations assessment Comprehensive Phase 2 (NVC) Botanical survey to be undertaken (June

2013) Top and bale vegetation Translocation of notable plant species ( to be undertaken by specialist) Marine Consent Licence if required Temporary footpath closure

General Issues effecting all stages of construction Machinery used within works (all machinery to be fitted with Environmentally Friendly Lubricants) The Works are all located within the SSSI/SAC All works will be undertaken in accordance with the Environmental Action Plan. A Pollution Control Management Plan will also be produced. Any incident that causes or may cause pollution will be reported immediately to Natural Resources Wales via the incident hotline 0800 807060 providing date, time, location, any mitigation already implemented and a contact name and phone number. All works, including all vehicular movement, loading and off loading, which take place within the SSSI/SAC, will be restricted to the working areas identified on Figure 1, i.e. all operations and access for embankment excavation works to be contained within footprints of embankments, plus a 4m wide access route linking the embankments to Penrhyn Drive North. The operations to re-expose the sand dune area will be contained within the footprint of the excavation, and accessed directly from Penrhyn Drive North. These working areas will be demarcated and enclosed on site using temporary 1 metre high timber post and 2 wire fencing. A 2m wide strip of geo-textile is to be laid onto the ground on the seaward side of the embankment and pegged to protect the salt marsh from debris rolling onto the ground whilst excavating the embankment. The protection strip will be inspected daily and any material cleared from it. Access onto the strip will be by foot only, and the ground protection will be removed on completion of the works. Excavation and earthworks will be undertaken using a 20tonne excavator on wide tracks, a bulldozer and 10tonne dump trucks. All plant will access the work via temporary haul roads. These will be designed to spread loading across the existing ground, and will be formed using aluminium track-way (on the flat ground) plus stone access ramps at the entrances, where the ground is uneven. The stone access ramps will include a layer of geo-textile to separate stone from the existing ground. Haul roads on flat ground will be aluminium track way to avoid impacting on the existing estuarine habitat. See figure 1 for diagrammatic representation of the above.

Working with the weather & tides

Daily weather forecasts to be gained from the Met office web site. Inshore shipping forecast from ‘St Davids Head to Great Orme Head’. Whilst working in the area after breaching the existing defence we will

METHOD STATEMENT


o Get a copy of tide tables & adjust to OS levels

o Identify ‘critical’ stop work levels / times

Further information on tidal areas from Coast guard. This may involve interpretation of weather conditions via discussions or Emergency plans. This information would be briefed to the operatives as a tool box talk and the weekly tidal information briefed during the first 10 minute briefing.

Site induction All operatives will be inducted when starting on site and the induction will cover the following main points,

The importance of working within a SSSI/SAC will be stressed No littering in any of the working areas Considerate Contractors Scheme Dust, noise, vibration to be kept to a minimum Environmental spill response training All Hydraulic oil in machinery to be biodegradable EAP / Environmental constraints plan / Risk Map displayed on office wall / Location of spill kits Specific working method statement to be given Plant refuelling procedures Risk of flooding Ecology issues – the works are within the SSSI / SAC. B&V’s Morfa Friog HRA drawing (drwg ref no.

16013) deals with land take and working issues upon the SSSI / SAC. Operations undertaken within the SAC / SSSI will be limited to working room indicated on the HRA drawing and Figure 1 only.

Spill response training To be undertaken by member of staff in practical demonstration form Spill kits to be available at following areas

o compound in stores o at fuel bowser compound and on all Machines o Major spill kit within working area of the SSSI / SAC

Noise monitoring The following will be carried out,

All plant and equipment on site will be of a good modern standard and regularly maintained We will contact the local Environmental Health Officer (EHO) prior to commencing the main We will work with the working times agreed between the EHO and planning conditions Health and Safety noise assessments will take place and will be risk assessed on the limits set by GE700

Parking Parking for site cars and vans will not be at Morfa Friog but will be at the main Fairbourne FRMS site compound. Refuelling To be undertaken at the side of Penrhyn Drive North at least 10m away from any watercourse. The bowser will have a 110% bund and will be contained in a drip tray. A major spill kit will also be located by it. Dust & debris on road The loading areas located off the road will be capped with clean stone and road vehicles will have minimal amounts of mud on tyres prior to leaving the site.

Bowser to be available at the works for dust suppression of haul roads Working areas will be kept neat and tidy Cleaning of access roads will be by road brush Road going vehicles will be restricted to running on hard surfaces Wheel cleaning facilities will be available (hose pipe, brush) at the main Fairbourne FRMI site compound

and if required a jet wash will be employed Vehicles travelling off site will be observed by the site Foreman to check for mud/debris on the road Any potential risk of run off from haul roads and/or wheel cleaning facilities which may be contaminated

due to contact with invasive species will be managed and addressed within the bio security risk assessment. No Japanese knotweed is present in the working area, and any other non native / invasive species present will be removed prior to commencement of the engineering works

Access routes will be maintained on site to ensure that there is no mud nuisance on the highway

METHOD STATEMENT


Road sweeping equipment will be on call and brought to site as required to clean large areas and ensure that the roads are clean and safe

Control measures will be in place for disposal of rubbish Waste A site waste management plan will be completed before work starts indicating types of waste approximate amounts and disposal routes. This will include confirmation that any excess materials will not be provided to local landowners for private flood bank maintenance works. Waste will be separated into different waste streams by:

separate skips for timber, office waste, demolition material excavated material will be separated and stockpiled separate bins for paper, plastics, glass

Waste (such as office waste, packaging,) will be removed from site using a registered carrier to a registered tip under a waste transfer note. Skips will be covered if a risk of materials being blown out of skip is present. If possible waste will be recycled / minimised. Bio Security A bio security risk assessment has been prepared and will be followed to ensure no introduction of invasive species. There are known locations of Japanese knotweed in the Fairbourne area, although none in proximity to the proposed Morfa Friog works. Any other non native and invasive species present will be removed from site prior to commencement of engineering works. Montbretia is understood to be present and any occurances of this species will be identified during pre-construction surveys and individual clumps dug up and removed from site. Restricted Byway Mr. & Mrs. Evans currently run a horse riding business and use the area for horse trekking. During the works a horse riding route will be maintained throughout; much of the existing byway that is used is unaffected and a crossing point at the northern exit/entrance will be established. A temporary closure of the footpath will be obtained prior to works to minimise public access to the site. Reinstatement of ground following removal of ground protections within SSSI/SAC Ground conditions to be inspected by NRW following removal of ground protections and any remedial works required agreed.

Method of work (refer to Figure 1) Site Setup

The main Fairbourne FRMS Site compound at Station Road will be made available for the works. Separate toilets will be set up off Penryhn Drive North on existing hardstand – not within the Morfa Friog

SSSI/SAC site (see Figure 1). A comprehensive Phase 2 botanical survey will be undertaken in June 2013 prior to works commencing.

This will include spot photographs of habitats and vegetation to be translocated and will be supplemented by aerial photographs of the site. The survey will also identify any native / invasive species present, which will then be removed. Montbretia, an invasive garden escapee is known to be present within the sand dune area of the site. Any specimens of Montbretia will be identified and removed prior to construction to avoid the risk of further spreading this plant.

Any vegetation identified for translocation in the above survey will be translocated prior to any works commencing.

Vegetation across the site will be cut and baled prior to works. Any re-growth of vegetation on the sections of embankments to be removed, and along haul route within

the scrape areas and haul routes, will be strimmed down, and arisings collected and removed. Where possible all vegetation cutting will be timed outside of the bird breeding season as Skylark are

known to breed in the area. If not feasible a breeding bird check will be undertaken prior to commencement. No breeding birds will be disturbed by the works.

Install traffic management to access points off Penryhn Drive North to consist of warning signage and vehicle crash barriers.

Install temporary fencing to demark working areas to consist of timber post and two wire fence. Erect silt fence at outer toe of embankment (seaward side of embankment). The silt fence is to catch

debris from the high tide, and will comprise a 300mm high layer of terram attached to the base of the post

METHOD STATEMENT


and wire demarcation fence and pegged into position. A further 2m wide strip of geotextile will be laid flat on the ground alongside the fence and again pegged into position providing ground protection on the salt marsh against any falling debris. The silt fence will be inspected for damage on a daily basis and repairs undertaken where necessary.

Construct temporary access ramps to allow vehicle access into working area off Penryhn Drive North. The access ramps will be constructed from stone aggregate compacted in layers and laid on geo-textile. The access ramps will be approximately 4.0m wide at the top with 1:2 side slopes. Machine and wagon access requires a minimum safe angle of 1:12.

An existing 200mm diameter pipe runs through the bank. Silt mitigation measures will be put in place around the pipe. These will consist of filter sock or a silt curtain on the outlet of the existing pipe which would be inspected daily and changed as and when required.

Offload 2.5m long x 3.0m wide track way panels at side of Penryhn Drive North.

Removal of the existing sections of bank

Complete northern access ramp and access first section of bank to be removed using 20 tonne excavator.

Using 20tonne excavator progressively remove the upper portion of the bank and load onto 10 tonne dump trucks

Whilst excavating the material will be split into it’s constituents o Stone pitching from front face o Soil and sub-soils

Remove soil and sub-soils material and tip at Station Road compound. Front pitching will be removed and stored at the compound or on the footprint of the old embankment. The embankment material will be excavated and taken to the main works site adjacent to the golf club for storage and transfer into road wagons

Profile remaining portion of the bank approximately 500mm to 1m higher than the existing ground level and construct temporary haul road along the top of the bank to be removed. This will allow for the temporary access route to second embankment section to be removed.

At the end of the first section of the bank install aluminium track way across the existing ground.

The track way will be positioned on grassland as far as possible to avoid the existing areas that flood creating pools of water.

Access second section of bank and profile bank approximately 1m higher than the existing ground level and construct temporary haul road along the top of the bank as before.

Working at none flooding tidal intervals breach embankment and remove remaining lower layer of material onto dump trucks.

Progressively work back to the access point from Penrhyn Drive North. Reinstate to the original ground level. Place stone pitching around ends of breaches. Drawing 109448/03 ‘Sections and Details’ shows the

stone pitching on more detail. The sand dune area will be re-exposed by removing existing vegetation and surface materials, to

around 200mm depth. A loading platform, 10 m by 3m will be constructed adjacent to the edge of the road with 300mm of crushed stone on geotextile. A tracked excavator will scrape the dune and pull the material towards the loading platform to be transferred into road wagons. When the dune scrape is completed the loading platform will be removed.

Temp haul road platform level

Existing ground level, final reinstatement level

Seaward face (existing stone pitching

500-1000mm

Existing bank

METHOD STATEMENT


Remove trackway panels. Remove material to site compound or Penrhyn Drive North and reload material onto a road wagon

and remove off site to licensed landfill. Completion

Final finishes will be inspected by the ECW and agreed with NRW on completion. Any areas of ‘spill’ will be cleared up by hand & 1tonne tracked walking dumper. All temporary installations will be removed from site. Stone and geotextile from access ramps, aluminium

trackway, and other geotextile ground protection / pegs will be removed. Geotextile ground protection will be removed by hand and taken to the Station Road site compound to be disposed via a licensed tip or re-used if possible. Road stone from access ramps will be taken to the Station Road site compound for re-use.

All fencing will be removed at the end of the works and any post holes remaining will be filled / reinstated and stamped down.

All site areas and access points will be left in a clean and tidy condition. Development of habitat will be monitored and managed by NRW in accordance with the site

management plan, ‘Framework Conservation and Monitoring Plan for Morfa Friog Saltmarsh Creation Scheme’.

METHOD STATEMENT


Figure 1 – Proposed site layout sketch

2 3

5

6

= Photo location points 3

1

METHOD STATEMENT


METHOD STATEMENT


Photo 6 – Sand dune reinstatement area

20130517 Fairbourne FRMS - Method Statement - Morfa Friog v2€¦ · 1.0 Scope of the Works: This...

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