01 MS for leak test new

3 REFERENCES DOCUMENTS3.1 Project specifications S-000-1312-1001V Construction Specification for Site Preparation and Earth WorkS-000-1310-0001V Detailed Engineering Design Data for Civi

METHOD STATEMENT OF LEAK TEST FOR MANHOLE

(DOCUMENT CLASS: X)

Operation Centre JOB Code: Operation Centre Doc No.:

1 PURPOSE 3

2 SCOPE OF WORK 3

3 REFERENCES DOCUMENTS 3

4 ORGANIZATION CHART 5

5 MACHINERY AND EQUIPMENT 5

6 MATERIALS 6

7 MANPOWER 7

8 RESPONSIBILITIES 8

9 PROCEDURE AND SEQUENCE 9

10 INSPECTION AND TESTING 18

11 HEALTHY, SAFETY AND ENVIRONMENT (HSE) 18

12 WORKING IN CONFINED SPACE 19

13 APPENDIX 24

1 PURPOSE

The purpose of this Method Statement is to describe the methodology involved in the works ofLeak Test for Manholes and Pipe and detail the steps to be taken in meeting the technicalstandards and HSSE requirements of NSRP Complex Project

This Method Statement covers the works related to inspection and leak detection (if any) for all themanholes which are located at the areas of C200 and C300 to ensure that the entire executionstages of work is done in line with good JGCS’s Engineering practices and compliance with JGCS’sEngineering standard practices, national and local codes

3 REFERENCES DOCUMENTS

3.1 Project specifications

S-000-1312-1001V Construction Specification for Site Preparation and Earth WorkS-000-1310-0001V Detailed Engineering Design Data for Civil and StructureS-000-1320-1001V Construction Specification for Concrete Works

S-000-1671-0916V Inspection and Test plan for Site Concrete Work

3.2 Drawings for construction

D-000-1320-1002V to 1004V Standard Details for Rebar ArrangementD-000-1320-1005V Standard Details for Concrete Structures General

ArrangementConstruction Drawings for Manholes

Construction drawing for Pipes

3.3 Standards and Codes

Requirements

BS EN 13263-1 Testing Concrete in Structures - Part 1: Cored Specimens

Taking, Examining and Testing in Compression

4 ORGANIZATION CHART

Site Manager: Do Minh Chau

Directly in charge for daily schedule, mobilization of equipment, materials supply capacity.

Survey, daily schedule, location of work, equipment control, labor for each kind of works

HSSE

HSSE Manager: PN GiangHSSE Supervisor: LH Trung,

VN Hai,HD Bach, DT Ninh

Equipment HSSE control, Permit, access way, Traffic, Labor entry, HSSE training, HSSE at work place

- Labors for works

- Minor tool and equipment, sub- materials, form and scaffolds.

Const Equipment

Condition and number

of Equipment, fuels, drivers, transportation, traffic control, signal, service.

5 MACHINERY AND EQUIPMENT

•

Prior to using any machineries/equipment at site, it will be inspected and certified by

qualified person

•

Periodic Preventive Maintenance will be made by all equipment and machineries

0 All operators and drivers are to be educated with valid driver's license/operator's license or permit

Only authorized signalman will be assigned together with the driver or operator.

os

Year of Manuf

6 MATERIALS.

• All material shall conform to the appropriate specification or standards listed above

unless/otherwise approved by Contractor

• All material shall either carry a quality certificate from the approved source or be tested to the

satisfaction and approval of Contractor

0 Concrete brick shall be used for construction of Temporary wall for plugging opening

1 holes on Manholes, it shall be removed after completion of Leak test

Rebar for Concrete work (at the connection location between RC Pipes and Manholes) shall comply with ASTM A-615 Grade 60 and approved by JGCS (refer to D-000-1320-1001V Drawing)

Concrete using for installation of Pipes (GRP Pipes or RCP Pipes) is concrete type Mix-A which comply with Specification S-000-1320-1001V and Drawing D-000-1310-1Q01V

- All workers must to have name card for travel on the site

Table 7.1: LIST OF MANPOWER FOR LEAK TEST WORK

No Manpower Equipment (ea) Manpower Note

The QC Inspector will ensure that the work is executed according to the Project requirements and quality dossier is fulfilled

9 PROCEDURE AND SEQUENCE

9.1.1Obtain valid permit to work (PTW) and other required certificate related for the works

9.1.2Prior to enter the working area, all equipment and machinery will be inspected by safety personnel

9.1.3All machineries, equipment and material shall be entering using the designated entrance gate

9.1.4Ensure that Vinaconex E&C shall comply with traffic management plan and safety transportation plan

9.2.1All material, machineries and equipment shall be located at designated area

9.2.2Setting-up of equipment will be done by Supervisor by adhering to all safety measurement and requirement outline

9.2.3Upon completion of set-up, joint inspection will be carried out to satisfy all parties and ensure all relevant equipment/machineries shall be complied

with safety rules and regulation.

9.3.1Prior to the work commencement, construction drawing will be reviewed to check of its latest issuance for construction and all essential details are given It will

be checked that the intermediate dimension agree with the overall dimension

9.3.2The setting-out will be made at the beginning stage of the work by referring

to the construction drawing and all reference points will be made necessary for the entire work This will be acquired and develop method of checking and cross-checking

on all setting-out operations When principal lines and levels have to be set-out, it would

be advised to be the relevant persons

Layout and marking will be marked using surveying equipment having a valid calibration

certificate and will be verified by QC

9.5 Execution of Leak Test for Manhole

Depend on the actual condition of construction site as well as the planning of the contractor, the

system of pipes connect to Manhole shall be executed at the same time or at another time withthe work for construction of Manhole The method statement of Leak test for manhole shall be divided into cases based on actual conditions of construction activities on site

A CASE1 : MANHOLES AND PIPES ARE- EXECUTED AT DIFFERENT TIMES

In case the pipes system is installed in other stage with Manholes, the excavation andinstallation work for pipes shall be carried out separately after finishing construction workfor manholes (Box out shall be left on the manhole wall to wait for installing of Pipes)

The sequence of Leak Test for Manhole and Pipe shall be in compliance with the chart asfollowing:

Preparation (Equipment& Material Mobilization, Setting out…)

Plugging the Openings of Manhole-exclude pipe

between 2 manholes leak test (Using Masonry block with Plastering Surface)

Leak test - Phase 1 (Leak test at position of Construction joint of Manhole

Excavation work and Installation Work for the

Pipes Connect to the Manhole

Backfilling Work for the Manhole and Removal the Sheet pile

(After Complete of Leak test-Phase 1)

Leak test - Phase 2 (Leak test at Position of Connection Joint between

Pipes and Manhole

Preparation Work

10Plan preparation

16

Equipment, man power and material for execution of Masonry Work, Pipe installation and Leak Test shall be mobilized and really for using prior to construction

CONSTRUCTION MASONRY BLOCK FOR PLUGGING THE OPENING

19.1.1Leak Test- Phase 1After finishing masonry work for the temporary wall and the plastering layer reach the required strength, process Leak Test for the Position of Construction Joint of Manhole The Leak test shall be carried out as the following steps:

 Step 1: Fill water to top of manhole or upper 1.5m from soffit pipe (which is lower)

in 1h for stabilization

 Step 2: Leak test in 8 h

 The work will be accepted as satisfactory when a visual inspection for water

Sheet pil e Top of paving

har d bar r icade

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Masonr y bl ock W/ pl aster ing l ayer Concr ete br ick

pl aster ing l ayer

stair with handr ain access and egr ess way

Sheet pil e

tightness reveals no leaks or external damp patches and:

L1 > 5(m) ; L < L1/500 (m)

L1 < 5(m) ; L1 < 0.01 (m)

Backfilling Work for the Manhole and Removal of Sheet pile (apply with deep Manhole)

20 Execution of Backfilling works shall be executed in compliance with Contractor Doc No VV3120-008-A-117: "Method Statement for Excavation works"

21 The backfilling work shall be carried out layer by layer to the ground level When finishing the work, Vinaconex.EC shall remove existing sheet pile around the manhole

22 The work for removal of sheet pile shall be executed sequential and under the supervision of JGCS Engineer

Top of paving

BACKFILLING WORK FOR MANHOLE (PHASE 1)

22.1.1

Excavation Work and Installation Work for the Pipes Connect to Manhole

23 Depend on the actual condition of construction site as well as the planning of the contractor, the system of pipes connect to Manhole shall be executed at the same time or at another time with the work for construction of Manhole In case the pipes system is installed in other stage with Manhole, the excavation and installation work for pipes shall be carried out separately

24 The temporary wall shall be removed prior to starting the pipe work Detail for connecting Pipes to Manhole is in accordance with design drawing

INSTALLATION PIPE INTO MANHOLE

24.1.1

Leak Test - Phase 2

After finishing installation and connection Pipes between two manholes, the contractor shall carry out Leak test for manholes to check the leakage at positions of connection joints with pipes

25 The Leak test shall be carried out as the following steps:

 Step 1 : Fill water into the manhole up to a specific level which not exceeding 1,5meters above the pipe soffit level

 Step 2: Until the water level shall be made up to produce the required test headmentioned above, the test shall commence Time for process of leak test shall be at

har d bar r icade

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least one hour after filling the test section unless otherwise having a specific timefrom instruction of the Jgcs Engineer.

 The system is deemed to have passed during the test period if the leakage is lessthan the following values:

1,0xD litter/Linear metre run of Pipe (Per one hour)With: D - Pipe diameter (m)

LEAK TEST FOR CONNECTION JOINT OF MANHOLE

har d bar r icade

el : WATER LEVEL FOR LEAK TEST

har d bar r icade

Backfilling work for pipe

When finishing Leak test and no leakage is detected as well as having the approval from JGCS Engineer, the back filling work shall be conducted It means that leak test procedure for the manholes is completed

Execution of Backfilling works for the pipes & manholes shall comply with Contractor Doc No W3120-008-A-117: “Method Statement for Excavation works”

BACKFILLING WORK FOR PIPES

25.1.2

For the Precast Manhole

26 The Leak test will carry out for manholes on casting area as item 9.5.3

In case the pipes system is installed in the same stage with Manholes, the excavation andinstallation work for pipes shall be carried out continuously after finishing construction work for

har d bar r icade

el :

har d bar r icade

el :

pIPE SOFFIT har d bar r icade

manholes In this case, the leak test for Manholes shall be proceeded one time for both theconstruction joints and connection joints The test is started after finish installation work of Pipes.The sequence of Leak Test shall be in compliance with the chart as following:

CHART 9.5.2: SEQUENCE FOR EXECUTION OF LEAK TEST FOR MANHOLE

(CASE 2)

Detail for each work in the above sequence shall be as the same work that shown in Case 1

The Site Inspection and Test Plan (ITP) for this work summarize various characteristics to bechecked The concerned Site Engineer/Foreman will be responsible to ensure stage wisecompliance for these operations and the Site QA/QC Engineer/Inspector will carry-out qualitycontrol checks and report the inspection results

Installation Work for the Pipes Connect to

Manholes (After finish Execution of Manholes)

Leak test (Leak test for Position of Construction Joints of Manholes and position of Connection Joints between

pipes and Manholes)

Backfilling Work for Pipes and Manhole, Removal of Sheet

pile (if any) (After Complete of Leak Test)

28 HEALTHY, SAFETY AND ENVIRONMENT (HSE)

All staffs and workers on site have to be HSSE trained before entering the project They must

study carefully Job Safety Analysis and Risk Assessment for the works before starting, participate

at Tool Box meeting in every morning

30

Safety and security staffs of our management team strictly complied with the regulations on

HSSE issued for the project Sufficient Persona! Protective Equipment (PPE) for workers such asglove, hard-hat, safety boots, glass, protective clothing should be provided Electrician shall haverubber insulation gloves etc All workers, during construction must wear uniformed PPE

31

Provide sufficient lighting for construction works at night-time

32

For construction equipment, prior to construction, it is necessary to check equipment’s

operation and carry out trial run The equipment, before being used shall be verified and shall getthe verification certificate from the JGCS HSSE’s team The equipment and machine shall be maintained at a periodical basis in accordance with the specified regime The warning system must be kept during the construction activities

33

For explosion/fire prevention work at fuel storehouses, and other inflammable areas, the

sub-contractor will provide fre fighting device, slogan and instruction to remind workers on the safety assurance, install fire fighting notice sign

34

The Contractor organizes a first-aid force on site and signs a contract with local medical

hospital to get ready to give emergency-aid and treatment when accident at work is happened

34.1 Environmental protection measures

The Contractor will obtain licenses, and procedures required for environment protection from

the local authority

36

Enhance frequently knowledge of environment for construction staffs and local resident

Popularize measures to minimize the effects to environment

37

Cleaning frequently and watering the road in and out near the project Truck for soil transport

should have cover sheet, daily water cleaned at truck wash

38

All stockpiles of excavated soil within the site will be less than 3m height, kept clean, in order

to minimum dust pollution

39

Regularly spray water against dust during construction

40

Speed of truck and cars at the Site shall not exceed 20 km/h (average 15 km) Cargo trucks of

soil shall be covered by canvas Moving on constructed permanent road is 30 km/h max speed.41

No directly discharging wastewater into the surface water drainage system

42

Water of rains overflowing construction area shall not be disposed directly into public

drainage system Drainage system shall be checked and maintained frequently.

42.1 First Aid

43

First aid facility is always made available during working hours by a qualified first aiders

wearing of the basic PPE will be enforced fully

44

Ambulance car with Driver, Helper and stand by Nurse are available at site at all times

45.1.1Risk assessment