Method Statement FINAL.docx

DREDGING WORKS AND CONSTRUCTION OF

TWO CONTAINER BERTHS

AT

RAS AL KHAIR

METHOD STATEMENT

FOR DREDGING & RECLAMATION WORKS

DATE: RAMADAN 1435H


TWO CONTAINER BERTHS ATRAS AL KHAIR

METHOD STATEMENTFOR

DREDGING AND RECLAMATION WORKS

Issued by:Rawabi Specialized

Contracting Company Ltd.

Date: Ramadan 1435HPage No.: Page 1 of 61

CONTENTS

DREDGING WORKS AND CONSTRUCTION OFTWO CONTAINER BERTHS

ATRAS AL KHAIR

Item Page No.

1. List of Key Personnel :

2.General Project Details :

3. Method of Construction :

4. APPENDIX ‘A’

Method Statement indicating Compliance with all Clauses of Specification :

5. APPENDIX ‘B’ :

Photographs of Equipment :



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1. LIST OF KEY PERSONNEL

Title Name Telephone No.

Project Manager :

Dredging Engineer :

Dredger Master :

Technical Office Engineer :

Safety Engineer :

Port Control : VHF Channel 67/19 0515187877

SEAPA Resident Engineer : Mehdi 0551918151



METHOD STATEMENTFOR


Issued by:Rawabi Specialized Contracting

Company Ltd.


Project Manager

DredgerMaster

MechanicalChief

Engineer

Laboratory Technician

Technician Electrical Mechanic

TechnicianMechanic

DredgerOperator

Reclamation Engineer

CivilForeman

CivilForeman

WelderPipe fitter

Labor

Heavy Duty Driver

LaboratoryHelper

Divers Seaman

Heavy Duty Operator

Secretary


TWO CONTAINER BERTHS AT

RAS AL KHAIR

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2. GENERAL PROJECT DETAILS

1. General

The Ports Authority is developing the Port of Ras Al Khair. The marine part of this development is the construction of the following works:

Remaining 185m of Berth 8 to complete the East –West line of the berths

A Roll on Roll off berth at junction of Berths 8 & 9.

Two Container Berths 330LM each

Dredging of Basin alongside to a depth of -15.00

Reclamation of all areas behind the quaywall and the West lagoon.

Edge Protection works at the south-west end of Berth 10.

Removal of core rockfill and armour from existing bund.

2. Method Statement

Under the terms of the contract a ‘Method Statement’ is required to be submitted for Dredging & Reclamation works of the contract.



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(Contd…. from previous page)

Description of Works

Works included in this Method Statement are as follows:

a) Dredging of basin up to depth -15.00 .

b) Dredging of trench to depth -18.50 for Berth 8 and Roll on Roll off Berth.

c) Dredging of trench to depth -20.00 for Berths 9 & 10.

d) Reclamation of storage area behind quaywalls.

e) Reclamation of lagoon area west of the existing road.

f) Provision of surcharge in various Storage Areas as required and directed by the Engineer.



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METHOD OF CONSTRUCTION

1. Survey

2. Boreholes & Testing

3. Permits from Govt. Agencies

4. Contractor’s Working Area

5. Equipment utilized for Dredging & Reclamation

6. Construction Schedule

7. Dredging Calculations

8. Sequence of Works

9. Reporting & Information

10. Monitoring

11. Risk Analysis & Mitigation

12. Compaction requirements for Reclamation

13. Contractor’s Comments



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1. SURVEY

The Survey Points and Bench Marks provided by the Ports will be utilized for the project.

Other points will be established for convenience of checking, and will be submitted to the

Engineer for approval before usage.

Topographic and Hydrographic surveys will be carried out in the presence of the Engineer’s

representatives. Arrangements for spot checking (soundings) shall also be made to ensure

matters remain under check.

Multi beam echo sounder will be employed for all hydrographic survey work.

Prior to commencement of dredging, a number of runs by the echo-sounder will establish

the presence of any obstruction on the sea-bed. As the Port is a new port it is not

envisaged that this should be a problem.

Tide Gauges, wind sock etc. will be provided to ensure all weather parameters are known

during the dredging operations.



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2. BOREHOLES & TESTING

A local firm will be engaged after obtaining approval from the Ports and all necessary information

obtained.

From the borehole information provided at tender stage, material appears to be good, suitable

material for reclamation.

However it appears that no boreholes were taken in the Basin Area. At least two boreholes wll

be taken in the Basin Area up to -18.00 or as directed by the Engineer to confirm suitability of

material.

Daily testing or as required at the change of dredged materials will be carried out in the presence

of the Engineer’s Representative and commensurate action taken as regards the suitability of the

material for reclamation purposes. Any poor material encountered will be dumped in the Spoil

Area.

After completing the Soil Investigations, if the results differ appreciably from that shown at the

tender stage, appropriate adjustments will be made to the Method Statement, to the approval of

the Engineer.



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3. PERMITS FROM GOVT. AGENCIES

As we will be working within the confines of a working Port, we envisage that there will be

no requirements of Permits or any permission to be taken from any Govt. Agency (Four

member committee etc.).

However, on our own, we will be taking care not to spoil the environment and will ensure

that whatever measures need to be taken are followed by all staff and equipment.

Any permit requirements from the Coast Guards or the Customs will be fulfilled to their

satisfaction.



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4. CONTRACTOR’S WORK AREA

A Contractor’s Work Area is shown in the Tender drawings which will be developed for the

production of the blocks.

A block loading jetty will be constructed at the required location where all mooring craft and

marine equipment will be parked when not in use or during inclement weather. Care will be

taken not to interrupt Port small craft traffic at Berth 4.

Diesel, the fuel for most marine craft will be brought in from land after taking permission from the

required Customs and Coast Guards authorities.



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5. * EQUIPMENT UTILIZED FOR DREDGING & RECLAMATION

1. DredgerIHC Beaver 65 DDSP(Modified by IHC)

: Dredging depth: 22m.Cutter Power: 700 KWDelivery Pipeline: 650mm dia.Dredger Pump: ……. HP

2. Tug BoatIHC Delta Multicraft1400 – DMC 1400

: Power: 609 HPSpeed: 8 knotsBollard pull: 7T

3. Survey Boat :

4. Pilot Boat :

5. Hopper BargeSelf propelled barge

:

6. Pipeline 650mm dia. : Length: …… m.

7. PontoonsBackhoe

:Doosan

8. Bulldozers :

9. Shovel :

10. Grader : Caterpillar

11. Steel Roller : Volvo

12. Other Equipment: : Tide GaugeGPSWind sockSilt curtains, booms etc.

* Note: Photographs of marine equipment included in Appendix ‘B’



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6. CONSTRUCTION SCHEDULE

The Construction Schedule for all works is enclosed. It can be seen that dredging

westwards in the line of Berth 8 up to a depth of -15.00 is the first activity to be

undertaken.

The same dredger will be employed to form the trench up to -18.50 after which blockwork

placing for the quaywall could commence.

As there are no interface requirements with any other contractor, we do not foresee any

problem in continuing with the dredging and blockwork installation on the rest of the

quaywalls as programmed.

The stages of construction are shown on Page No. 14.



METHOD STATEMENTFOR


Issued by:Rawabi Specialized Contracting

Company Ltd.




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7. DREDGING CALCULATIONS

Total volume to be dredged : 2,125,540 cu.m.

Assume period required : 15 months

Volume of dredging/month : 141,703 cu.m./month

Rate of Dredging, assuming 20 days/month work : 7,085 cu.m./day

Note that the dredger is provided with pumps, situated below water level on the ladder, hence is capable to carry out dredging operations up to -22.00 satisfactorily.

i.e. one dredger is capable to carry out all dredging works of the contract. However, should the need arise for a grab dredger for cutting the trench or for removal of hard material in the Basin, we have arrangements for deploying a grab dredger.



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8. SEQUENCE OF WORK

The sequence of work will be as follows:

1. IN-SURVEY

2. DREDGING

a) Berth 8 & Ro Ro

Dredging up to -15.00 in the line of the trench. Dredging of trench up to -18.50 . Approval from Consultant for proceeding with quaywall construction.

b) Berths 9 & 10

Dredging up -15.00 in the line of the trench Dredging of trench up to -20.00 . Approval from Consultant for proceeding with quaywall construction.

c) Basin

Dredging up to -15.00 .

3. OUT SURVEY

4. RECLAMATION

Prior to any reclamation the following works need to be carried out:

a. Removal of rockfill underlayer and core from rear of Berth 8 and its storage.

b. Removal of rockfill underlayer and core from the rear of Berths 9 & 10 and its storage.

c. The rock armour, underlayer etc. of the West Breakwater (besides the Lagoon) will be removed and stored at the location required by the Ports.

d. A further layer and geotextile will be provided before reclamation will proceed in the area.



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8. SEQUENCE OF WORKS (Contd…….)

e. Filling the area behind Berth 8.

f. All excess dredged material at this stage ill be diverted to the West Lagoon area.

g. Filling the area behind Berths 9 & 10 up to bund.

h. After completion of blockwall, provision of rear rockfill, filter, geotextile etc. complete the reclamation up to the sand bund *.

Stages I – V

Drawings included in Appendix B show the various stages of dredging and reclamation.

* Note: Sand bund will be of coarse material and will not in any way alter the characteristics of the fill.



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9. REPORTING & INFORMATION

Daily Reports will be submitted to the Engineer.

Photographs of work in progress will be submitted together with the Weekly Reports.

An In-survey will be carried out in the presence of the Engineer’s Representative and the

sheets signed for records.

An Out-survey will be carried out in the presence of the Engineer’s Representative suitable

for submission by the Ports to the mariners.

The dredger and all support vessels will remain in constant contact by radio with the

Harbour Master to ensure none of the Port incoming or outgoing vessels are interrupted by

the operations.

24 hour operation is envisaged for all dredging and reclamation work.



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10. MONITORING

Constant monitoring of the following parameters will be carried out:

Turbidity

Movement of silt

Water quality.

Please note that the temperature of the water may be higher in the basin due to the presence of

the Ma’aden outfall. The water may be saltier too.

Consequently, care will be taken regarding concrete for the structures, steelwork, slope protection

rock etc. to ensure that they stand well to the additionally aggressive conditions found in the

Basin. It is expected that the temperature and salinity of the Basin may reduce after dredging has

been carried out as a larger body of water will be available for dispersion.



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11. RISK ANALYSIS AND MITIGATION

The Harbour appears to be well protected where the dredging works and reclamation

works are to take place. Large current/waves cannot enter the harbor as breakwaters

shield the Port from the North and the North-west winds. The lagoon is totally protected

from the west and the north sides. Little mitigation measures need to be carried out in this

respect.

Interference with shipping is also foreseen to be minimum as all work is to the west of the

existing shipping berths and traffic. Only small boats, vessels visiting Berth 4 will need to

be diverted slightly when the final dredging up to -15.00 in the basin will be carried out.

This should be simply straightforward and should not pose any problem or would require

mitigation measures.

Any risk to environment shall be mitigated by ensuring there are no leaks in the joints of

the discharge pipes.

If dredging operations result in silt/sedimentation finding its way into the adjacent basin,

silt curtains will be provided to ensure that it is kept to a minimum.

As the Western Lagoon is on the other side of the main road leading to the Aluminium

Berths 5, 6 & 7, alternative roads will be provided if the permanent road will be closed for

traffic. Alternatively if the Port allow ramps with mild slopes will be provided to ensure

passage of heavily loaded trucks without difficulty. There will be some interface

requirement with the contractor CHEC who has constructed a temporary road west of the

Main Road on which they will be moving their Armour Blocks made available from the

North Breakwater.

All marine staff will be provided with life jackets, life buoys and rafts will be available for

any emergency.



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11. RISK ANALYSIS AND MITIGATION (Contd…..)

Adequate beacons, buoys etc. will be provided for the dredging operations to eliminate

chances of collision. Flood Lighting will be provided such that it would not confuse the

shipping. All vessels shall be equipped with VHF phones and mobile telephones to

ensure rapid communication.

We understand that a number of days will be lost for the dredging operation because of

dusty and windy weather. All marine craft will be parked safety during such conditions and

the Ports kept well-informed of their positions.

Care will be taken in the sequence of reclamation that tail water never gets trapped.

Overflow weirs etc. will be constantly provided and monitored to ensure discharge of

excess water.



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12. COMPACTION REQUIREMENTS FOR RECLAMATION

From the materials indicated to be dredged and used for reclamation, it appears that the

required densities will be reached without resorting to either Dynamic Compaction or

Vibroflotation.

As the dredged material appears to be more in quantity than the reclamation area volumes,

it is expected that surcharge will need to be placed on all areas. This in itself will provide

the long term consolidation required for either the Lagoon Area or the Port Storage Areas.

Areas behind the wharf which are subject to more stringent requirements will be carried out

by the future construction contractor of the Container Terminal.

Homogeneity of fill will be ensured by constant movement of the dredged material by

bulldozers. Fine material pockets will not be allowed to form that may lower the quality

requirements of the fill.

Should densities not be achieved for any reason above water levels, 10T rollers will be

provided to compact the fill in layers to give the required compaction in the Storage Areas.



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13. CONTRACTOR’S COMMENTS

a) Surcharge

From preliminary calculations it appears that there will be more dredged material than what is

required for reclamation. Should the quantity of dredging exceed the allocated BOQ quantity,

we assume that a Change Order will be provided as all quantities are subject to

remeasurement. Consequently, surcharge will have to be provided in the reclamation areas

which will induce settlement and consolidation of the fill in the long run.

As the surcharge will be in the wind direction, some form of treatment would be required at

the top of the surcharge to ensure that it does not blow itself into the basin or other areas of

the Port.

b) Filling of West Breakwater

Before filling could commence in the Lagoon area, the eastern side of the breakwater will

need to be provided with a layer of filter and geotextile. Apparently there is no provision for

this work in the contract BOQ.



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APPENDIX A

METHOD STATEMENT INDICATING

COMPLIANCE WITH ALL CLAUSES OF

SPECIFICATION



METHOD STATEMENTFOR

DREDGING AND RECLAMATIONWORKS

Issued by:Rawabi Specialized Contracting Company

Ltd.


General

(C)4 DREDGING AND RECLAMATION

(C)4.1 Dredging

(C)4.1.1. The area to be dredged is shown in the Drawings. All dredging shall be to the profiles shown in the Drawings.

Dredging will be carried out in accordance with the bathymetric survey (In-Survey) agreed by the Engineer.

Rates for dredging all materials

(C)4.1.2 The removal of rubbish, foreign object or obstructions found on the seabed.

Noted.

Obstacles (C)4.1.3 In order to prevent damage to his plant and equipment, it is recommended that the Contractor should locate and remove such obstructions before beginning dredging.

Noted.

Plant and methods

(C)4.1.4 The plant and methods used for dredging shall be subject to the prior approval of the Engineer, but such approval shall not relieve the Contractor of his responsibility for ensuring that his plant and methods are suitable, efficient and sufficient for the works, nor of any other of his responsibilities under the Contract.

The method of dredging and transporting material shall be such as to obviate any deposition of material navigable channels or berths. In the event of unavoidable spillage occurring to such an extent that siltation of any navigable channel or berth occurs, the Contractor shall, at his own expense, immediately restore the affected channel or berth to its original depth to the satisfaction of the Ports and the Engineer.

Details of the dredger are attached. In case of breakdown (which may not be frequent as dredger is new) we will mobilize a second dredger which is working at King Abdul Aziz Port, Dammam.

Noted. Care will be taken so that the silt etc. should not find its way into the channel. If required, silt curtains will be employed to ensure sediments do not move far.

Programme to be flexible

(C)4.1.5 The programme of dredging must be flexible. It may need to be varied to meet the working needs of the Port and the construction programme, or for any other reason considered necessary by the Engineer. Meetings shall be held with the Engineer or any other party, as and when required by the Engineer, to arrange a suitable programme.

Noted. As long as it does not delay the construction of the quaywall, in which case extension of time will be requested.



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(C)4.1.6 Not used.

Tolerances and limitations

(C)4.1.7 The tolerances and limitations of dredging are as follows:-

(a) Quaywall foundation trench.The finished trench profile shall not, at any point, be shallower than the design profile shown in the Drawings, neither shall it be deeper than the design profile by more than 250mm, nor wider than the design profile by more than 500mm (on each side). Should these tolerances be exceeded, except on the written instructions of the Engineer, the Contractor shall, at his own expense, backfill over cut areas in accordance with the Engineer’s instructions.

(b) Quay-SideWithin 30 metres of the quay face, the Contractor shall not over-dredge by more than 250mm below the design profile. Should such over-dredging occur, the Contractor shall, at his own expense, backfill to the design profile with approved material.

a) Noted.

b) Noted.

Side slopes

(C)4.1.8 The side slopes to the boundaries of the prescribed dredging areas and the side slopes to the quay-wall foundation trench shall be dredged in accordance with the design profiles shown in the Drawings, or to whatever other such profiles as the Engineer may decide, having regard to the nature of the materials present. Alternatively, if approved by the Engineer, a series of benches equivalent to the exhibited side slope may be dredged, and any such benching shall be deemed to be a side slope for the purpose of this Clause.

Agreed. Benching will be carried out to form the slopes.

Disposal of dredged material

(C)4.1.9 If dredged material is suitable for use as reclamation fill (as specified in (C)4.2.4), it shall be deposited in areas to be reclaimed. If it is not suitable for this purpose, it shall be dumped, in accordance with the Engineer’s instructions, in the approved spoil ground shown in the Drawings.

Dredged material unsuitable for use will be dumped in the Spoil Area, the coordinates of which are known.



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Disposal of dredged material(Contd….)

Before tendering, the Contractor shall satisfy himself as to the distance between areas to be dredged and the spoil ground and reclamation areas and shall include in his rates and prices for dredging for the conveyance of dredged material from any part of the areas to be dredged to any part of the spoil ground or reclamation areas. No claim will be entertained in respect of length of haul between the dredged areas and the spoil grounds specified herein.

Should the dredged material be utilized for reclaiming the western lagoon, the contractor must ensure that his operations do not disrupt Ma’aden Aluminium Company’s and Port traffic to Berths 5-7.

No dredged spoil shall be dumped in any area other than the specified spoil ground or such other spoil ground as may subsequently be directed by the Engineer. The Contractor shall hold the Ports indemnified against any claim that may be made against it through the Contractor’s default in this respect.

The rates for dredging and disposal of material shall include for all temporary moorings, stages, pipe work, sluices, temporary bunding and any other works necessary for carrying out the work in an efficient manner.

Noted

Noted

Noted

Agreed

No simultaneous discharge

(C)4.1.10 Not used.

Surveys of dredging areas

(C)4.1.11 Prescribed dredging areas shall be surveyed from time to time during and after dredging operations, as specified below or as required by the Engineer, for the purposes of measurement or for any other reason. The cost of all such surveys will be deemed to be included in the Contractor’s rates and prices for dredging.

Unless otherwise specified or required by the Engineer, surveys shall be made using a suitable launch fitted with an approved echo sounder and positioning shall be made by using approved electronic location equipment. For this purpose, the Contractor shall provide operators who have been trained by the supplier of the equipment and certified as capable of such duties.

Joint monthly surveys will be conducted for the inclusion of quantities in the interim valuations.

Noted.



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Surveys of dredging areas(Contd…)

Bar calibration or the echo sounding equipment shall be carried out prior to the commencement of each day’s surveying and at such other times as the Engineer may direct and the corrections shall be agreed between the Contractor and the Engineer.

Noted.

Surveys of foundation trench

(C)4.1.12 The method of survey of the quay-wall foundation trench after completion, or alleged completion, shall consist of close-centred spot soundings to provide cross-sections at regular intervals. The techniques used and the frequency of soundings and cross-sections shall be to the approval of the Engineer. Notwithstanding any such approval, the techniques and frequencies shall be amended if required by the Engineer as the work proceeds. For the purpose of this Clause, the foundation trench shall be deemed to include for all dredged side slopes or benches, and the surveys shall also be extended for an approved distance on each side of the trench.

Agreed.

Joint surveys

(C)4.1.13 Before dredging commences, the Contractor and the Engineer shall jointly make survey of all areas which are to be dredged and all areas in which reclamation is to be placed. The method and frequency of sounding shall be to the Engineer’s approval. The Contractor shall prepare a drawing showing the agreed levels, and this shall be signed by the Contractor and the Engineer. On the basis of the agreed drawing, the Contractor shall prepare drawings showing sections through these areas, all to the Engineer’s satisfaction.

Unless otherwise specified or required by the Engineer, the survey procedure described in Clause (C)4.1.11 above shall be repeated for all interim and final measurements, and the quantities determined by difference, but with due regard to over-dredged material (see Clause (C)4.1.17).

In-survey will be carried out by Gulf Consult in the presence of the Engineer shortly.

Agreed.



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Payment (C)4.1.14 Payment for dredging will be made under the appropriate items in the Bills of Quantities, and the quantities shall be determined in accordance with Clauses (C)4.1.11 to (C)4.1.13 for the following:-

(a) the sum of net volumes of materials dredged from prescribed dredging areas and deposited in reclamation areas, as specified.

(b) the sum of net volumes of materials dredged from prescribed dredging areas and dumped in the spoil ground or elsewhere, as specified.

No payment will be made for dredging per se, in borrow areas, or elsewhere as specified, for the purpose of winning reclamation fill.

Agreed.

Agreed.

Siltation, inflow etc

(C)4.1.15 Payment for dredging any one area will be made once only. Until all dredging and reclamation has been completed to the Engineer’s satisfaction, the Contractor shall remain responsible for the removal from dredged areas of any subsequent influx of materials, whether this be caused by siltation, sedimentation, inflow, collapse of side slopes, discharge or deposition, or any other cause, irrespective of whether or not this may be directly attributable to the Contractor’s operations.

When required to do so by the Engineer, the Contractor shall determine the depth of siltation (the term shall be taken to include the influx of silt or mud, however caused) in any specified area, at any time after dredging. The method, which shall be to the approval of the Engineer, shall enable such deposits to be differentiated from the underlying materials where, in the opinion of the Engineer, this is reasonably possible.

Noted.



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Interim measurements

(C)4.1.16 The Engineer will give monthly certificates on account of sums which may become payable. Interim measurements will be based on either:-

a) agreed joint surveys, as specified in Clause (C)4.1.13 or

b) agreed net volumes of material dredged during the month to which the Certificate relates.

Agreed.

Agreed.

Over-dredging (C)4.1.17 Payment will not be made for any material dredged from below or outside of the design profiles shown in the Drawings, or any other such profiles as the Engineer may from time to time direct, and the volume of any such material shall be deducted from the total volume dredged to determine the net volume for which payment is due.

Agreed.

Final measurement

(C)4.1.18 On completion, or alleged completion, of dredging in any particular area, the survey procedures specified in Clause (C)4.1.11 to (C)4.1.13 above shall be repeated. If it is found that the required profile has not been attained, or the required slopes not properly formed, the Contractor shall further deepen, extend or correct such areas as necessary, all to the satisfaction of the Engineer. A further joint survey of the area shall then be made for the purpose of final measurement. A deduction shall be made, in accordance with Clause (C)4.1.17, for material dredged from below or outside of the required profile.

A survey will first be carried out ourselves and then the Client will be notified.

Final sweep of dredged areas

(C)4.1.19 On completion of all dredging and reclamation, the Contractor shall sweep the whole of the dredged area, using equipment approved by the Engineer, to ensure that no high spots or obstruction remains. If any such high spots or obstructions are revealed, the Contractor shall remove them at his own expense.

Agreed.



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Weekly returns

(C)4.1.20 The Contractor shall, at the end of each week, submit to the Engineer’s Representative in duplicate, and in such form as the Engineer shall require, a return of the measurements of materials dredged.

Noted.

Rates to be inclusive

(C)4.1.21 All costs in connection with the provision and maintenance, in good working order, of all necessary plant and equipment necessary for dredging will be deemed to be included in the rates and prices in the priced Bills of Quantities.

Noted.

General

(C)4.2 Reclamation

(C)4.2.1 The area to be reclaimed is shown in the Drawings. All reclamation shall be carried out to the lines and levels shown in the Drawings, unless otherwise directed by the Engineer.

The levels shown in the Drawings shall be deemed to be those required at the end of the Maintenance Period. The Contractor shall make allowance, therefore, for settlement of the reclamation fill after placement. This shall be done by initially placing the fill levels higher than those shown in the Drawings and the magnitude of this allowance shall be agreed between the Contractor and the Engineer (or otherwise determined by the Engineer) on the basis of all available data. Fill above water level shall be laid and compacted in 300mm thick layers and shall be compacted to 75% Relative Density. The density tests shall be carried out on a 50m grid.

The Contractor shall allow in his rates and prices entered in the priced Bills of Quantities for the additional material required to allow for settlement.

A topographic survey will be carried out and agreed with the Engineer before placing any reclamation material.

Fill will be compacted as required.

Agreed.

Source of reclamation material

(C)4.2.2 The source material provided for reclamation filling shall consist of material arising from any source always that both the source and quality of the material are to the approval of the Engineer. Any such approval of source material given by the Engineer shall not relieve the Contractor of his full responsibility for ensuring that the finished reclamation satisfies all the requirements of this Specification.

The source of reclamation material will be the suitable dredged material from the trench and the basin.



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Samples for approval

(C)4.2.3 The Contractor shall submit any such samples of the reclamation fill source material as are required from time to time by the Engineer for the purpose of approval.

Noted.

Reclamation fill grading above chart datum

(C)4.2.4.2 All material deposited in the reclamation for use as reclamation fill above chart datum shall consist of naturally occurring soils and rock fragments and shall have a grading curve wholly within the limits shown graphically in Figure 2 below. The principal limits are as follows:

The Specification will be followed.

Lab tests will be carried out continuously to the Engineer’s satisfaction.



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Segregation to be minimized

(C)4.2.5 The placement of reclamation fill shall be carried out in such a manner that segregation of material is limited and that specified gradings are satisfied throughout the as-placed material.

Bulldozers will be utilized to mix the materials to ensure consistency is achieved in the reclamation materials.

Unsuitable material

(C)4.2.6 Any material not complying with the requirements of the Specification, or any other such requirements as the Engineer may from time to time stipulate, shall be deemed unsuitable and shall be rejected. Material so rejected shall be removed from the Site and replaced with suitable reclamation fill all at the Contractor’s expense.

Noted.

Programme to be flexible

(C)4.2.7 The programme of reclamation shall be flexible. It may need to be varied to meet the working requirements of the Port and the construction programme, or for any other reason considered necessary by the Engineer. Meetings shall be held with the Engineer, or any other party, as and when required by the Engineer to arrange as suitable programme.

Noted.

Clearance of seabed

(C)4.2.8 Before depositing any reclamation fill, the Contractor shall remove all vegetable matter, foreign objects and any other substances on the seabed which, in the opinion of the Engineer, could have an adverse effect on the Works. The cost of such removal shall be deemed to be included in the rates and prices entered by the Contractor in the Priced Bills of Quantities.

Noted. A visual survey will be carried out together with the Engineer’s representative on the Western Lagoon. Any filling behind the quaywall will be inspected at low tide.

The shallow areas are not expected to have any obstruction.

Pumping (C)4.2.9 If pumping plant is utilized, it shall be capable of placing reclamation fill to any level as directed by the Engineer in any part of the reclamation. This includes the placement of reclamation fill as a surcharge to levels higher than the finished levels shown on the drawings, as described in Clause (C)4.2.14 of this Specification.

Surcharge material will be provided as the dredged material appears to be in excess of the reclamation areas. Booster pumps will be utilized where necessary.



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Distance to borrow areas

(C)4.2.10 Before tendering the Contractor shall satisfy himself as to the distance between any borrow area and the reclamation area. He shall include in his rates and prices for the conveyance of material from any part of any borrow area to any part of the reclamation area and no claim will be entertained in respect of length of haul.

Noted.

Transport of reclamation fill

(C)4.2.11 Subject to the requirements of this Specification, the fill material shall be discharged into the reclamation area by whatever means the Contractor considers most suitable, including dumping and/or pumping through floating pipelines, provided always that his methods are to the approval of the Engineer. Whilst depositing into a reclamation area material dredged from the prescribed dredging area, the Contractor shall not simultaneously discharge into the same area material originally won from a borrow area.

Fill by trucks will be considered for the lagoon if desirable. Permission by the Ports from certain locations where crossing the roads will not be dangerous, will be sought. The road will be protected adequately.

Method statement with tender

(C)4.2.12 The Contractor shall, at the time of tendering, submit to the Engineer an outline description of the methods he proposes to use to convey and discharge material for reclamation.

Method Statement is being submitted.

Method of reclamation

(C)4.2.13 Reclamation will be performed by placing of material (if suitable) dredged from the prescribed dredging area shown on the Drawings or as instructed by the Engineer.

Noted.

Temporary surcharge

(C)4.2.14 As and where directed by the Engineer, additional material shall be placed as a temporary surcharge to pre-load the reclamation fill. The extent, level and duration of all surcharge loading will be decided by the Engineer, normally on the basis of soils tests and instrumentation, and the work shall be carried out strictly in accordance with the Engineer’s instructions.

Joint surveys shall be made in accordance with Clause (C)4.2.17 of this Specification, as and when necessary for measurement purposes.

Noted.

For interim payments, soundings will be taken or an echo sounder will be employed Noted.



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Disposal of surcharge material

(C)4.2.15 The surcharge material shall, when decided by the Engineer, be removed and carted away. Unless otherwise approved by the Engineer, all surcharge material shall comply with Specification Clause (C)4.2.4.

Joint surveys shall be made, in accordance with Clause (C)4.2.17 of this Specification, as and when necessary for measurement purposes.

Noted.

Method of payment

(C)4.2.16 Payment for reclamation will be as follows:

For material dredged from the prescribed area shown on the Drawings or as instructed by the Engineer, payment will only be made for dredging as described in Clause (C)4.1.14. No additional payment will be made for reclamation.

Noted.

Measure-ments

(C)4.2.17 Before the placing, in any area, of material obtained from borrow areas, the Contractor and the Engineer shall make a joint survey and the results shall be recorded on a drawing showing the agreed levels, which shall be signed by the Contractor and the Engineer or his Representative. The total as-placed volume of reclamation which will be required to reclaim any area shall be calculated using levels shown in this drawing and the finally required reclamation levels.

Unless approved by the Engineer, the Contractor shall not place material dredged from the prescribed dredging area upon material obtained from borrow areas. If such placing shall be approved, sufficient joint surveys shall be made to enable the volume of material from the prescribed dredging area which has been placed to be calculated and this volume shall be deducted from the volume of reclamation determined as described above.

Measurements will be based on the joint In-survey (topographic survey) carried out at the commencement of the contract.



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Measure-Ments(Contd…)

Reclamation areas shall be surveyed from time to time before, during and after reclamation, as specified above or as required by the Engineer, for the purposes of measurement or for any other reason. The cost of all such surveys will be deemed to be included in the Contractor’s rates and prices for reclamation.

Noted.

Weekly returns

(C)4.2.18 The Contractor shall, at the end of each week, submit to the Engineer’s Representative in duplicate, and in such form as the Engineer shall require, a return of the measurements of reclamation materials placed.

Noted.

Rates to be inclusive

(C)4.2.19 All costs in connection with the provision and maintenance, in good working order, of all necessary plant and equipment necessary for raising the reclamation areas to the required levels will be deemed to be included in the rates and prices in the priced Bills of Quantities.

The rates and prices shall also include for the costs of provision, and subsequent removal, of all temporary culverts and sluices necessary for the satisfactory completion of the reclamation in accordance with this Specification.

Noted.

Compaction to 75% relative density

(C)4.2.20 Where the reclamation fill is not subjected to surcharge loading, all fill above Mean High Water Springs Level shall be thoroughly compacted in layers by vibratory rolling, or by other means to the Engineer’s approval, such that the finished relative density of each layer is at least 75%. Relative

density Dr, shall be defined in terms of voids ratio, ‘e’, as follows:-

where emax and emin are determined using the procedures given in A.S.T.M. Standard D2049 ‘Test for relative density of cohesionless soils’.

A laboratory will be utilized who will assist us in determining the densities on a regular basis.



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Testing of samples

(C)4.2.21 Representative samples of the reclamation fill within its upper 2 metres shall be tested in accordance with the Standard defined in Clause (C)4.2.20 above to determine their maximum and minimum voids ratios. Further samples shall be submitted to the Engineer if required.

Noted.

In-situ density measurements

(C)4.2.22 The Contractor shall measure the in-situ dry density of the compacted reclamation fill, at regular intervals as directed by the Engineer, using the procedure given in BS 1377 Test 15(B). Tests will be required by the Engineer at various levels within the upper 2 metres of fill and the Contractor shall excavate shallow pits as necessary to enable these tests to be made. Excavation of the last 200mm down to test level shall be done carefully by hand to avoid disturbance of the soil to be tested.

Noted.

Testing prior to construction

(C)4.2.23 In-situ density tests shall also be made, in accordance with the Engineer’s instructions, within the areas of buildings or other structures prior to their construction. The maximum depth of such tests below finished level will be 2 metres. (Where investigation to greater depth, by instrumentation, boreholes or Dutch probes, is also required, payment for these will be made under the items in the appropriate section of the Bills of Quantities.

Not applicable in our case.

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APPENDIX B

PHOTOGRAPHS OF EQUIPMENT

1. Dredger

2. Tug Boat

3. Pilot Boat

4. Any other



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Documents

Method Statement FINAL.docx