01 WMS @ Earthwork (Highway) MH-WMS-001 -EA Rev3 (24!3!14)

Document Reference : MH/WMS/001 (EW) rev1

Document Date : 24 Mar. 2014

WORK METHOD STATEMENT FOR EARTHWORKS (Road or Highway Construction)

PROJECT TITLE: PROPOSED SERI KEMBANGAN INTERCHANGE AND TOLL PLAZA

Maju Holdings Sdn. Bhd.

Doc. Date: 24 Mar.14

Doc. Reference: MH/WMS/001(EA)rev1

Work Method Statement for Earthworks (Road/Highway Construction)

Proposed Seri Kembangan Interchange And Toll Plaza Table of Contents

Section

Titles / Subtitles

Page

1.0

Objective

3 of 9

2.0

Scope of Work

3 of 9

3.0

References

3 of 9

4.0

Resources Planning

3 of 9

4.1 4.2 4.3

Material Planning Manpower Planning Machinery & Equipment Planning

5.0

Material Handling & Delivery Inspection

5.1 5.2

Material Handling Material Delivery Inspection: Checking Methodology

6.0

Coordination between Other Trades

6.1 6.2 6.3 6.4

Coordination between Others: Architecture Trades Coordination between Others: C&S Trades Coordination between Others: M&E Trades Coordination with Traffic Management Control

7.0

Work Methodology

7.1 7.2 7.3 7.4 7.5 7.6 7.4

Survey Setting Out Preparation to Start Work Protection and Preventive Actions Dewatering System and Silt Trap Method of Working in Cutting Section Method of Working in Filling Section As-Built Drawings

8.0

Quality: Inspection and Test Plan

8.1 8.2 8.3

Inspection Test Plan Relevant Construction Standard & References QC Documents or Relevant Checklist

9.0

Health, Safety, Security and Environment

9 of 9

10.0

Attachment

9 of 9

4 of 9

5 of 9

6 of 9

8 of 9

2

Doc. Date: 24 Mar.14

Maju Holdings Sdn. Bhd.

Doc. Reference: MH/WMS/001(EA)rev1

Work Method Statement for Earthworks (Road/Highway Construction)

Proposed Seri Kembangan Interchange And Toll Plaza

1.0

OBJECTIVE    

2.0

To outline the sequence of work for Earthworks) and step by step construction methodology until completion of the earthworks. To outline preparation or coordination required before start work To outline quality plan or inspection test required during project implementation To perform safe working environment and compliance to the safety requirements.

SCOPE OF WORK In general scope of work for this work method statement cover the following:Scope of Works Earthworks for road and highway project including earth cutting, earth filling and compaction.

3.0

Descriptions / Details Earthworks consist of the following items;  Survey Setting Out  Preparation To Start Work  Protection and Preventive Actions  Dewatering System and Silt Traps  Method of working in Cutting Section  Method of working in Filling Section

REFERENCES   



BS 8000: 1989 Part 1 – BS for Workmanship on Building Sites Part 1: Code of Practice for excavation and filling BS 1377: 1990 Part 1 – BS Method for Soil for Civil Engineering Purposes Part 1: General Requirements and Sample Preparation BS 1377: 1990 Part 4 – BS Method for Soil for Civil Engineering Purposes Part 4: Compaction Related Tests

 Mackintosh Probe Test  Atterberg’s Limits – Liquid Limits and Plastic Limits  Field Density Test (FDT) BS 1377: 1990 Part 9 – BS Method for Soil for Civil Engineering Purposes Part 9: In-situ Tests

4.0

RECOURCES PLANNING

4.1

Material Planning Item 1 2

4.2

Earth (suitable for backfilling) Sand / Crusher Run (Applicable for Temporary Access)

Manpower Planning Item 1 2 3 4

4.3

Material Descriptions

Manpower Descriptions Project Manager Project Engineer / Supervisor / Surveyor Machinery Operator (Excavator, Backhoe, Compactor, Truck) General Workers

Machinery & Equipment Planning 3

Maju Holdings Sdn. Bhd.

Doc. Date: 24 Mar.14

Doc. Reference: MH/WMS/001(EA)rev1

Work Method Statement for Earthworks (Road/Highway Construction)

Proposed Seri Kembangan Interchange And Toll Plaza Item 1 2 3 4 5 6 7 8 9 10

Machinery & Equiptment Descriptions Excavator Bulldozer Roller Static or Vibratory Backhoe Motor Grader Back Pusher Dump Truck Traffic Sign Board with Blinker Light (for diversion) Water Pump Water Sprinkler (for dust control)

5.0

MATERIAL HANDLING & DELIVERY INSPECTION

5.1

Material Handling  All good earth (suitable for backfilling) shall be placed at designated location as stockpile where the material not mixed with the unsuitable material where free from swamps, marshes, logs, peat, bogs, stump or other toxic materials

5.2

Material Delivery Inspection: Checking Methodology Material

Earth suitable for backfilling

Items to be Checked or Inspected  Backfilling earth shall be cut from site, no import material otherwise instructed by client  All earth shall be cleaned free from unwanted material such as clay material, swamps, marshes, rubbish, logs, peat, bogs, stumps or other toxic material.  Additional laboratory test will be conducted to confirm the material is suitable for backfilling to determine Atterberg’s Limits or Proctor Test to be conducted to check the soil properties

Method of Inspection

Visual & Test Random Sampling

4

Maju Holdings Sdn. Bhd.

Doc. Date: 24 Mar.14

Doc. Reference: MH/WMS/001(EA)rev1

Work Method Statement for Earthworks (Road/Highway Construction)

Proposed Seri Kembangan Interchange And Toll Plaza

6.0

COORDINATION BETWEEN OTHER TRADES

6.1

Coordination between Others: Architecture Trades (Not Applicable)

6.2

Coordination between Others: C&S Trades 

Temporary Drain (Temporary Earth Drain, Construction Drain) – In order to keep the earthwork area free from standing water, proper temporary drainage system shall be constructed.



Construction of Temporary Access/ Logistic Plan – Temporary access is very crucial during early stage of construction, where smooth work flow will indirectly benefit the project performance: Smooth progress of work as per scheduled  Higher productivity

6.3

6.4

Coordination between Others: M&E Trades 

To Check if any M&E Services at the excavation work area (Underground Services) – All underground M&E services shall be marked prior start any excavation work. The machine operator or supervisor in charge should check and verify the site condition prior start excavating the earth. The above action required in order to prevent damages or any accident may happen.



The following are the common underground M&E services such as: Water Reticulation System  Sewerage Route  Telecommunication Cables  Electrical or Power Supply



Relocation of All M&E Services (Underground Services) – Necessary protection required to ensure the work done in safe way.

Coordination with Traffic Management Control 

Traffic Management Control (Traffic Diversion) – Traffic diversion plan shall be submitted to relevant authority for approval prior any road closure or road diversion prepared at site. The traffic diversion shall be conducted as per approved plan.

5

Maju Holdings Sdn. Bhd.

Doc. Date: 24 Mar.14

Doc. Reference: MH/WMS/001(EA)rev1

Work Method Statement for Earthworks (Road/Highway Construction)

Proposed Seri Kembangan Interchange And Toll Plaza

7.0

WORK METHODOLOGY

7.1

Survey Setting Out 

    

7.2

Preparation to Start Work:  



7.3

Boundary/ Building Setting Out /Alignment/ Control Level(TBM) : Surveyor setting out shall be according to the coordinates stated in the latest construction drawings. Random/spot check shall be carried out to the existing alignment or project boundary to confirm the available data is correct. After confirmation, surveyor required to start transferring the survey information and establish project control station (Traverse) and control reference level (TBM). Surveyor shall refer to points given by licensed surveyor to set out the control stations. Coordinates shall be recorded and checked by using at least three (3) established markers on the grounds. For records purpose, the control point shall be jointly checked with relevant parties and acceptable the pegs shall be protected to avoid any disturbance or damaged. All traverse survey works shall be closed. Any closing errors shall be corrected by distribution or otherwise. The site clearing works commence only after the Original Ground Level (OGL) has been taken and endorsed by both parties.

Land Acquisition: Prior start work, the project manager shall checked and ensure that the Employer or relevant authorities have acquired the right of way lands Temporary works: Silt Trap/ Access road, temporary drainage, wash through and silt trap shall be constructed accordingly. Solid waste dumps sites shall be predetermined within or outside the site for the dumping of the site clearing materials. Mackintosh Probe: Testing carried out according to the Consultant Engineer Instruction. All test results submitted to Consulting Engineer to confirm the depth of USM removal.

Protection and Preventive Action 

Before commencement of excavation works, check that the following items have been securely protected: Protect the drains from damage and keep clear from debris at all times to prevent clogged drain which may cause flood.  Check and report any benchmarks or any established survey point found at the excavation areas. Do not remove or damaged unless instructed otherwise.  Underground services or overhead cables to be detected and protected prior to start any excavation works. Recommended to install sufficient warning sign to keep the machine operator aware about all the services near to the work area.  Any private property near to the excavation works shall be protected to avoid any damaged or accident. .

6

Maju Holdings Sdn. Bhd.

Doc. Date: 24 Mar.14

Doc. Reference: MH/WMS/001(EA)rev1

Work Method Statement for Earthworks (Road/Highway Construction)

Proposed Seri Kembangan Interchange And Toll Plaza 7.4

Dewatering System or Silt Trap  

7.5

Prior to the commencement of excavation, silt traps shall be constructed to act as filters to control siltation from the storm-water runoff on site. Selection of the silt trap location should be planned which it’s can be easily drained into the connecting drainage system. Temporary perimeter drain shall be provided on site in conjunction to discharge the surface run-off and water collected and drained out to the Silt Trap.

Method of Working in Cutting Section  

Hydraulic excavators used for bulk excavation. Dump truck used to transport or haulage the excavated material to the filling or stockpile area. Hauling of material from cuttings to the embankments or other areas of fill shall proceed only when sufficient compaction plant is operating at the place of deposition.

Generally, for cutting, the following operations are followed:  

Engineer to check and approve the setting out. Topsoil or unsuitable material to be removed up to the cutting limits; average 150mm, for unsuitable material removal depth of removal shall be determined by conducting “Mackintosh Probe Test” Excavation will be carried out in such a way that, in case of rains, no water will be trapped. At all times the excavated surfaces shall have sufficient cross-fall to shed the water and prevent water ponding.

Removal of unwanted material or unsuitable material (USM)  Material consider under unsuitable material (USM) as per following: Surface Vegetation – Long Grass, Weeds, Branches, Saplings  Stripping and Stockpiling Top Soils (minimum of 150mm)  Rubbish, Stump, Boulders  Swamp, Marshes, Bogs, Peat, Logs and Toxic Materials 

 Any material visually or tested classified as Unsuitable material, or as per Engineer’s Instruction

QUICK plastering work,excavation check the works, following:QUICKCHECK: CHECK:Prior Before and during check the following: All fixed joinery items installed accordingly  Check possible obstruction or any temporary works  Brick surface notrequired contaminated fungus organic growth orof beforeby start workor such as relocation oils which may interfere coating adhesion underground M&E services/ risky excavation works  Alignment withinnear tolerances / Correct setting out to private property  Finished products (Aluminium/Timbe  Check site condition – soggy or swamp or unsuitable material shall be removed and replaced

7.6

Method of Working in Filling Section

7.6.1

Trial Compaction For first filling and compaction activities, contractor shall arrange trial compaction to see and evaluate the number of passes required to achieve the required degree of compaction. Theoretically, different type of soil and type of compactor machine will produce different degree of compaction achievement. The machine capacity and effectiveness may the addition factor. 7

Maju Holdings Sdn. Bhd.

Doc. Date: 24 Mar.14

Doc. Reference: MH/WMS/001(EA)rev1

Work Method Statement for Earthworks (Road/Highway Construction)

Proposed Seri Kembangan Interchange And Toll Plaza 7.6.2

Generally, for filling works, the following operations will be used:  

   



Surveyor to provide setting out. Topsoil will be stripped off up to the filling limits with minimum 150mm topsoil layer. Operation / Method: Suitable excavated materials shall be loaded to haul area of fill by using dump truck. The dump truck will unloaded a short distance away from the area of fill, bulldozer or Backpusher will then level the earth to the area of fill. In this way the compacted layer beneath will not be damaged by the dump truck. Once the surface is ready for filling, suitable materials are placed and spread out using backpusher and/or motorgrader and/or bulldozer. End or side tipping to form embankment will be avoided. The earth filling shall be carried out layer by layer and every filling layer shall not exceed 300mm. Compaction to be carried out by vibratory compacting roller. Compaction shall be carried out until the filling compaction achieved at least 90% degree of compaction of Field Density Test (FDT). At least one(1) FDT to be carried out for area of 1,000 sq.meter aQUICK CHECK: Before and during filling works, check the following: Before filling works, the area should be free from unsuitable or combustible material. It shall be well compacted using roller compactor  For the roadwork or highway standard, compaction for filling works (subbase layer), minimum compaction of 90% shall be achieved in FDT test.  Filling thickness layer by layer shall be not exceeding 300mm  For (Road base layer) compaction shall achieved minimum 95% degree of compaction.

8

Maju Holdings Sdn. Bhd.

Doc. Date: 24 Mar.14

Doc. Reference: MH/WMS/001(EA)rev1

Work Method Statement for Earthworks (Road/Highway Construction)

Proposed Seri Kembangan Interchange And Toll Plaza

8.0

QUALITY: INSPECTION & TEST PLAN

8.1

Inspection & Test Plan

No

Stage of Work

1

Setting Out, Boundary or ROW check

2

Submission of Traffic Diversion for Authority approval

3

4

Frequency Every Location When Required Traffic Diversion (Submission follow Authority Requirements)

Preparation, Protection & Temporary Work

When Required

Site / Soil Investigation

Every Location suspected to be USM

(Site Condition)

Checking Required

Method

Work within boundary or ROW, Correct alignment or level control

Survey Check

Within survey tolerance

Planning and preparation required for the traffic diversion

Letter Submission

Approved by Relevant Authority

Using temporary shoring required C&S consultant approval or design calculations

Review Design Calculation

Design Calculation Approved by Design Consultant

Conduct Testing:a) Visual Check b) Mackintosh Probe c) Proctor Test

Random Sampling and Test Visual / Review Mackintosh Probe Results

5

Removing Unsuitable Material / Topsoil

All areas

Top soil removal minimum 150mm thick, USM removal depth to follow Mackintosh Probe Test

6

Working in Cutting Section or Slope

Every Cutting Section or Slope

Excavation or Cutting to required level as per surveyor pegs

Survey pegs/ Construction Drawing

7

Trial Compaction

Once

To check number of passes required

Compacted by Roller

8

9

Working in Filling Section

Every Filling Section

Compaction Test

One(1) test for every 1000 sq.meter

Filling or Backfilling according to required level as per surveyor, Filling layer by layer, maximum thickness 300mm per layer Conduct Field Density Test (FDT) to check Degree of Compaction of minimum 90%

Acceptance

Material not under USM category such as clay etc.

Consultant approval prior to backfilling Excavation or Cutting to the required level or depth as per Drawing Achieve the required degree of compaction

Survey pegs/ Construction Drawing

Filling to the required level as per Construction Drawing

FDT Test

FDT Results achieved the specified compaction

9

Maju Holdings Sdn. Bhd.

Doc. Date: 24 Mar.14

Doc. Reference: MH/WMS/001(EA)rev1

Work Method Statement for Earthworks (Road/Highway Construction)

Proposed Seri Kembangan Interchange And Toll Plaza 8.2

Relevant Construction Standard & References   



BS 8000: 1989 Part 1 – BS for Workmanship on Building Sites Part 1: Code of Practice for excavation and filling BS 1377: 1990 Part 1 – BS Method for Soil for Civil Engineering Purposes Part 1: General Requirements and Sample Preparation BS 1377: 1990 Part 4 – BS Method for Soil for Civil Engineering Purposes Part 4: Compaction Related Test

 Mackintosh Probe Test  Atterberg’s Limits – Liquid Limits and Plastic Limits  Field Density Test (FDT) BS 1377: 1990 Part 9 – BS Method for Soil for Civil Engineering Purposes Part 9: In-situ Tests

9.0

OCCUPATIONAL SAFETY AND HEALTH (OSH) All occupational safety and health (OSH) measures shall be as per FACTORY AND MACHINERY ACT 1967 under: Building Operation and Works of Engineering Construction” (BOWEC) Safety Regulations 1986. Relevant Regulations – further details please refer to the following regulations: Part II : General Provision  Part VIII : Runways and Ramps  Part XI : Demolition  Part XII : Excavation Works  Part XIII : Material Handling and storage, Use and Disposal  Part XV : Blasting and Use of Explosives (if the work involved any blasting works)

10