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1 Description of Works, Duration and Location

This method statement covers the installation of drainage including manholes / gullies and connections into the interceptor / attenuation tank. The pipes will be various sizes ranging from 100 mm to 375 mm dia. The manholes will be precast concrete1050, 1200 and 1350 dia and 600 / 450 diameter plastic PPIC`s. The drainage depth varies up to 3.5m in depth.The works will be ongoing throughout the project starting with the drainage at the discharge manhole and the proposed connections for the office and welfare compound set up. The works will be carried out in line with the current programme and the availability of work areas.

The duration of works will be as the contract programme.

Location of the site is : New Union Street, Ancoats, Manchester, M4 6BW.

2 Supervision (incl Phone Numbers)

ACS Contracts Manager – Brendan Mooney – 07971416781ACS Site Supervisor– Nigel Blackburn – 07835175668ACS Site Engineer – Dave Longden – 07823550461

3 Information Available on Known Hazards

Movement of plant – Works will be carried out within exclusion zones with a competent Banksman in attendance.

Refer to site specific risk assessment register for applicable risk assessments.There may be a number of live services within the site working area, these services will be identified using site plans, cable avoidance tools / equipment and trial holes as and when required.

Trial Holes & Slip Trenches will be hand dug using ‘non conductive’ hand tools to prove/dis-prove the presence of services.

ACS has been issued with the relevant utility survey drawings which indicate the services expected in each location. Each specific excavation will be accompanied by a marked up service drawing which will be issued along with the permit to dig. All excavations and mechanical works will be controlled by the issue of specific permits to dig. All permits will be issued by SISK on request.

Note – should any buried services be found which may impede the installation of any of the proposed new works, the management team to be notified immediately

Note when putting in the base for the turnstile 3x green ducts where located approximately 2m in depth which should be noted in relation to the planned works

4 Work Operations Planned Works

With reference to drawing: - Proposed Drainage Layout No. DR-C-0001

This Phase of the works: Manhole CO1 – S6 with 150mm dia connecting drain +150mm dia pipe b’twn S6 & back of offices for toilet connection.

NB Out fall connection from CO1 is 225mm dia.

Note: Existing Security Cabin is to be removed to position manhole CO1. (chains connected to top of cabin and lifted with excavator & removed (new location to be confirmed)

All works are within site boundary and therefore exclusions zones to be agreed with client. Site access issues in relation to the works will be agreed and implemented by client prior to works commencing.

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No works are to commence until the following processes/procedures are in place:

1. This Method Statement & associated Risk Assessments have been submitted to the relevant persons / Authorities.

2. Site inductions and site briefings have been completed.3. Agree and mark out areas with the relevant persons / Authorities.4. Check existing service drawings, carry out CAT scans advise relevant

persons of any findings.Erect fencing to segregate the work area and agree with the principle contractor safe pedestrian access / signage and relevant traffic management systems.

5. Issue to the operatives a permit to dig with a copy of the relevant service drawings.

6. All ACS site operatives & management associated with the project, have the appropriate CSCS / CPCS training certs.

7. All Approved for Construction drawings & Schedules will be available on site.

8. Welfare facilities will be established on site.9. The works area and agreed fencing lines has been defined and agreed

between all parties.Once the above is in place, site works can proceed as follows:

During the installation of the drainage at the welfare area, there is an existing concrete slab which will need to be broken out. There is a cabin on top of the slab which will first need to be lifted (by others as agreed on site). The slab will then be broken out using breakers 8t excavator and attached breaker. The concrete will be removed from the working area to a temporary stockpile before being removed from site.

DRAINAGE SEQUENCE

1. The site engineer will mark out the position of the drainage run to the latest

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revision drawing.2. Pipe trench will then be excavated by the 8t Excavator which is suitable to

the size and location of drain run.3. For excavations requiring ground support this will be provided by a steel

drag box (AS PER APPENDIX A) which would be pushed down as the excavation proceeds or by sheets and frames dependant on relevant services, this will be investigated on site. The shoring box systems to be used will include integrated ladder safe access points and handrail systems and will be installed as per the manufacturer’s recommendations.

4. Gas monitor to be present at all times when excavating to ensure there are no harmful gases/ substances when working within the excavation.

5. Shallow excavations will have battered or stepped sides suitable to the ground conditions.

6. Any ground water encountered will be controlled by pumping and discharging in to an existing drain, this will be agreed on site.

7. The excavator will then place the specified bedding and lower into place the pipe. THE EXCAVATOR BUCKET MUST BE REMOVED FROM THE MACHINE PROIR TO THE PIPES BEING LOWERED INTO THE TRENCH.

8. Pipes will be laid in accordance with the drainage specification & relevant drainage sections. (Note drainage pipes have been changed to polypipe)

9. Depth of bedding and the line / level of pipes will be controlled by pipe laser with periodic checks by the site engineer.

10. Pipe laying will continue following the above procedures until reaching the manhole or pop up position.

11. No personnel are to enter any unsuitable trench and daily inspections must be carried out and inspections recorded weekly.

12. All excavations when left open must be fenced off. Drainage works to be carried out within a secure segregated area

13. No excavated material to be stored adjacent to excavations. (45 degree angle of repose) unless the storage/stock pile is a minimum 1m away from the edge of the excavation.

14. Prior to any backfilling notification should be given to Sisk and an Engineer (at least 24hrs notice) who will conduct a drainage inspection. (ACS will also inspect and record the drainage run before backfilling in line with the company’s quality procedures).

15. Specified backfill will be placed in layers by the machine and once the agreed cover to the pipe is reached the trench will be compacted by roller or vibrating plate.

MAN HOLE SEQUENCE

1. Manhole excavations will be as pipe trench with a purpose made manhole box installed (AS PER APPENDIX B), whenever possible the box systems will include integrated access and handrail systems or a stepped / battered excavation for shallow manholes.

2. On completion of the excavation concrete (in accordance with specification) will be placed inside the manhole to form the base and pre-cut/manufactured channels set (as per schedule)

3. Note: Additional care will be taken to ensure the concrete surrounds the underside of the existing pipe work in the outfall manholes where applicable.

4. Precast concrete manhole rings will be lowered on top of the Manhole Base using certified man hole lifting eyes (THE EXCAVATOR BUCKET MUST BE REMOVED WHILST PLACING THE MAN HOLE RINGS).

5. Grano benching will be formed to complete the base. Note: When possible the benching works are to be carried out before the man hole cover slab is in place, this will reduce the Amount of works carried out within a confined

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space. Note: Operatives entering a confined space must be trained and signed onto the confined space method Statement.

6. Additional Rings will be placed on top of the 1st until the required/total number of rings has been installed. And reduced level checked.

7. A cover Slab will be placed on top of the final ring8. Any backdrops will be constructed as per the design details and concrete

surround placed to the manhole rings.9. Suitable protection will be placed to the openings within the cover slab to

prevent falls. This will be achieved using either the steel manhole cover or boarded out using 2x sheets of plywood with timber fixed below to minimise the risk of the plywood moving.

10. A steel manhole surround shutter will be lifted and set into position prior to semi dry concrete being placed around the manhole, this will then be left to cure for 1 day to minimise the disruption to the concrete and giving it time to cure before backfilling.

11. Once the concrete has cured the manhole surround shutter will be removed and the excavation will be backfilled and compacted with the specified fill.

12. Once the Manhole Biscuit is in place then the manhole will be treated as a confined space. Only trained confined space personnel can enter the confined space, with confined space equipment and under a confined space permit issued by John Sisk.

Interceptor Installation

1. The site engineer will mark out the position of the interceptor to the latest revision drawing.

2. The Interceptor will be excavated by the use of the 13t 360 degree machine.

3. The depth of the excavation is approximately 4.3m deep but the ground will first be reduced by 0.3m so 4m of ground will require shoring.

4. An agreed shoring design from Ground force will be issued for the excavation which ACS will follow the procedure set out in the design for the safe installation of the shoring.

5. The shoring design will be based on 1 No. M/H box at 2.5m and 1 No. M/H top box at 1.5m high. The plan size of the boxes will be 3m by 2m.

6. Any ground water encountered will be controlled by pumping and discharging into agreed locations.

7. The Petrol Interceptor will be installed as per the procedure set out from the manufacturer, Conder CNSB Bypass Separator.

8. The Interceptor will be placed onto the concrete base while the concrete is still wet.

9. The interceptor will need to be filled with water to a depth of 300mm and then the pipe work levels will need to be checked.

10. Concrete will then be backfilled around the tank evenly while we will continue to fill the tank with water however the water level can be no more than 300mm above the concrete level.

11. The turrets of the interceptor will then be connected and sealed. The concrete surround will then continue of the chamber and turrets in lift heights not exceeding 500mm. The concrete surround of the turrets will be formed by using 1050 diameter M/H rings to act as permanent formwork. The M/H rings will be carefully lifted into place by the use of the excavator.

12. Once the backfill is complete then footings will be cast to enable the manhole cover and frame to be placed.

13. Pipe laying will then continue following the drainage RAMS until reaching the outfall manhole.

14. No personnel are to enter any unsuitable trench and daily inspections must be carried out and inspections recorded weekly.

15. All excavations when left unoccupied must be fenced.

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5 Control of Operations

Ensure a competent and authorised person is in attendance throughout the duration of the site works.

Ensure a site induction is provided and attended by all persons involved in the works.

Ensure all site specific hazards are identified & any control measures are understood and in place.

Ensure a daily ‘Take time is under taken in accordance with Sisk’s SOPS is undertaken at the start of each shift, by the competent person.

Ensure all operatives sign in and sign out a daily basis.

All plant movements are controlled by banksman.

All plant and wagons leaving the site do so with due regard to other road users and pedestrians.

Ensure compliance with method statements and associated documentation..

Deep excavation, information and warnings signs are to be erected at each work location.

6 Storage / Materials Handling

A designated storage area must be identified and agreed with the client. All materials must be stored in this area, unless otherwise agreed with the client.

All materials will be stored in the site compound and brought to the face of work as and when required.Good housekeeping to be maintained and Sisk clean as you go policy to be adopted.There will be a design mix obtained for the concrete requirements.

7 Operatives (incl. Competence)

Machine / Plant Operators – CPCS competent.General Operatives – CSCS competentSlinger Banksman – CPCS competentThe amount of operatives on site will depend on the work load.

8 Accompanying Risk Assessments

ACS-RA-COM-002 – Excavations

Refer to site specific COSHH register for identified COSHH assessments

1. Concrete/Cement2. Grease3. Diesel Engine Oil4. Petrol5. Hydraulic Oil

9 Plant and Equipment

8 tonne Excavator6-10 tonne DumpersBomag 120 rollerCompressor & breakersCable Avoidance ToolForward & Reverse Plate CompactorHerras Fence Panels & Work Signs.

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Sthil Saw with dust suppression kit for any cutting activities.Concrete poker and unit.Battery Powered pipe Lasers.Gas monitorRelevant shoring equipmentLifting chains & shackle (suitably rated for loads requiring lifting)GeneratorsWater pumpsHand ToolsDavit winch arm ( for use in specific rescue procedure)

Certs for all plant to be obtained for the site file.

ALL SMALL ITEMS OF PLANT SHOULD BE SAT ON DRIP TRAYS WITH SPILL KITS IN CLOSE PROXIMITY.

NO SEMI-AUTOMATIC QUICK HITCH DEVICES ON ALL EXCAVATORS – FULLY AUTOMATIC OR FULLY MANUAL ONLY.

10 Safety of Third Parties

The work site is located within a secure site fence line, all excavations and plant movements are to be co-ordinated and where possible carried out within fenced areas.Consideration will be shown to the residents at all times work will be done in an agreed sequence and cause as little disruption as possibleOther contractors will be present on site undertaking various works as well as using the welfare facilities where some of the drainage is to be installed. The work area`s will be separated with fencing and appropriate signage to prevent unauthorised access. Particular attention is to be made at the welfare area that a banksman must be present at all times due to the of pedestrian movement.

No tools or equipment will be left out overnight and will be locked away in the designated storage cabin.

11 PPE Requirements

MANDATORY PERSONEL PROTECTIVE EQUIPMENT.

Hard hat,Safety boots,Hi-viz Clothing.Safety GlassesSafety Gloves appropriate to the work tasksEar defenders to be available as will all other PPE deemed relevant to the tasks to be carried out.

12 First Aid Requirements (incl. Name of first aider)

First aid kits will be available on site, in the site office`s.

ACS - provide a nominated first aider: Dave Armstrong.

The route to the nearest hospital will be displayed on the site notice board and communicated to all Operatives through the site induction.

13 Welfare Requirements

Welfare facilities are available on site.

14 Fire and Emergency Procedures

Muster point and fire procedure plans will be displayed in the site office and advised at the site inductions.

15 Environmental Issues

Site specific environmental issues:

1. Refuelling Activities - ACS to ensure that all refuelling operations are carried

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out in a designated area with fuel spill kits available on hand. Emergency procedures to be displayed at re-fuelling designated area.

2. All timber will be supplied with the relevant FSC certification.

3. Concrete wash out – The concrete wagons will wash out in the designated wash out area. This will be created by utilising a small metal skip, lined with plastic sheeting. The concrete delivery drivers will be directed to wash out in the skip. Upon completion of the concrete works, the washout/water will be left to settle and solidify. The water will be segregated and removed from the skip (usually by small pump) and disposed into an agreed soakaway area of the site. The solidified concrete will be disposed off site, with the skip, to the local recycling facility.

4. Surface water and pumping from excavations will be required and specific locations will be identified and procedures agreed with site management.

5. Plant to use drip trays and spill kits available.

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APPENDIX A

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Appendix B

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Person producing the Method Statement:Name (Please print):

Brendan Mooney

Signature: Position:

Contracts Manager

Date:

31-01-2017

Person approving the Method Statement:Name (Please print):

Terry Day

Signature: Position:

SHE Manager

Date:

31-01-2017

ALL PERSONS SIGNING THIS METHOD STATEMENT WILL HAVE READ SIGNED AND UNDERSTOOD THE CONTENTS OF THIS METHOD STATMENT AND THE ASSOCIATED RISK ASSESSMENTS. If site conditions vary or if works are to be carried out in a different manor or sequence then it should be included in the amendment procedure on page 6.

Employee Signatures:No Signature Name/Date No Signature Name/Date

1 2

3 4

5 6

7 8

9 10

11 12

13 14

15 16

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Important Telephone Numbers

Paul Grady ACS Managing and Safety Director 07771 730 490

Danny Doohan ACS Operations Director 07764 443 280

Brendan Mooney ACS Contracts Manager 07971 416 781

Terry Day ACS SHE Manager 07800 604 877

Office ACS Office at Cheadle Hulme 0161 486 6300

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Amendment Procedures

If it is necessary to amend this method statement, the amendments will either be listed below, or the method statement will be rewritten. If the method statement is rewritten, this will be noted in the table below.

Date Amended

Amendment Signature of Person making

Amendment

Signature of

Operatives affected

Date

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