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Method Statement for Soil test after Site Leveling Project VA2 OM Accommodation Page | 1 2 22 02 22 D T Tuan T N Khoa T X Loc FOR APPROVAL 1 22 01 24 D T Tuan T N Khoa T X Loc FOR APPROVAL 0 22 01 11 D T Tuan T N Khoa T X Loc FOR APPROVAL Rev Date Prepared Checked Approved Details of Revision Owner VUNG ANG II THERMAL POWER LLC Owner’s Engineer TOKYO ELECTRIC POWER SERVICES CO , LTD EPC Contractor PACIFIC CORPORATION JSC Subcontractor Project VUNG ANG II THERMAL POWER PLANT PROJECT Title METHOD.

2 22.02.22 D.T.Tuan T.N.Khoa T.X.Loc FOR APPROVAL

1 22.01.24 D.T.Tuan T.N.Khoa T.X.Loc FOR APPROVAL

0 22.01.11 D.T.Tuan T.N.Khoa T.X.Loc FOR APPROVAL

Rev Date Prepared Checked Approved Details of Revision

Owner

VUNG ANG II THERMAL POWER LLC

Owner’s Engineer

EPC Contractor

PACIFIC CORPORATION JSC

Subcontractor

Project

VUNG ANG II THERMAL POWER PLANT PROJECT

Title

METHOD STATEMENT FOR SOIL TEST

AFTER SITE LEVELING

Document No

VA2-OM-MS-SI-08

Rev

2

Page No

18 Pages

FOR APPROVAL

Method Statement for Soil test after Site Leveling

Project: VA2 O&M Accommodation

Contents

I INTRODUCTION 3

1 General on project 3

2 Legal basis 3

II SCOPE AND PURPOSE OF THE SOIL TEST AFTER SOIL LEVELING 4

1 Scope of Soil Test 4

2 Code and standards 4

3 Purpose 5

4 Time Schedule 5

III TECHNICAL REQUIREMENT FOR SOI TEST WORK 5

1 General 5

1.1 For equipment and personnel 5

2 Field Test after soil leveling 6

2.1 Electric resistivity test 6

2.2 Plate Load Test 9

2.3 Underground water chemical analysis .12

IV HSSE MANAGEMENT PLAN 13

1 The preventive measures to ensure safety during construction 14

1.1 Before entering the work area: 14

1.2 The Health Safety Security and Environment requirements at work: 14

2 Risk Management 15

2.1 Steps to risk assessment: 15

2.2 Risk Matrix Tool: 15

2.3 Risk Level Matrix: 16

3 Risk assessment analysis……… 18

I INTRODUCTION

1 General on project

The Housing Colony (O&M Accommodation) area is 3.0573ha and is located in Lot CT03 in

Ky Long – Ky Lien – Ky Phuong urban area in Vung Ang Economic Zone, Ky Anh town, Ha Tinh Province The Housing Colony (O&M Accommodation) will be designed for about 230

to 250 staff, workers and operators and will comprise living blocks, entertainment function areas, technical function areas, services areas and road systems

Figure 1: Landscape layout plant of O&M Accommodation

2 Legal basis

- Construction Law No 16/2003/QH11dated November 26, 2003 of the National

Assembly of the Socialist Republic of Viet Nam

Method Statement for Soil test after Site Leveling

Project: VA2 O&M Accommodation

- Based on Decree No 15/2013/NĐ-CP dated February 06, 2013 of the Government's

on construction quality management

- Based on Circular No 10/2013/TT-BXD dated July 25, 2013 providing detailed implementation on quality control of construction works as defined in the Government's Decree No 15/2013/NĐ-CP

II SCOPE AND PURPOSE OF THE SOIL TEST AFTER SOIL LEVELING

1 Scope of Soil Test

The specification covers the work required for Soil Test after site leveling, checking and reflecting detail design (if any)

In order to provide sufficient soil data for the reflecting of detail design, the soil test work shall consist of but not limited to following major contents:

- Determining the resistivity of soil under foundation

- Determining the soil elastic module E and soil parameter such as cohesive force (C) and internal friction angle (ᵩ) of soil leveling

- Determining groundwater elevation and underground water chemical analysis

Quantity and location of the tests refer to Attachment 1.1 & 1.2 (the Owner can choose

quantity and location of the test by actual site condition) In case of Plate load test results

is too different from test result of the lab, two more plate load test shall be carried out

2 Code and standards

- Construction test – Basic principle: TCVN 4419 – 1987

- Procedure of Exploratory excavation for geological engineering test: TCVN 9437 -

2012

- Sampling, storage and transportation methods: ASTMD1587, D4220

- Electrical Resistivity Test: TCVN 4756-1989, TCVN-9385-2012

- Standard Test Method for Bearing Capacity of Soil for Static Load and Spread

Footings: TCVN 9354-2012, ASTM 1194

3 Purpose

The purpose of this construction tests is reflecting detail design works (if any)

The purpose of proposed Soil Test is:

- To determining the resistivity of soil leveling

- To determining the elastic module (E), cohesive force (C) and internal friction angle (ᵩ)

of soil after leveling

- To determining groundwater elevation and water chemical analysis

4 Time Schedule

Time schedule shall comply with Project time schedule L3 – O&M Accommodation has been approved by Owner

III TECHNICAL REQUIREMENT FOR SOI TEST WORK

1 General

1.1 For equipment and personnel

Testing equipment will be mobilized to the site shall be carefully checked to be in good working conditions before entering into the site, clearance surrounding the site shall be always kept All certificates of equipment shall be valid during implementation

of the works Qualified engineers shall be required for conducting in situ test and laboratory test

The certificates of equipment and personnel shall be submitted and get approval from owner and relevant parties priory to work at site

All the tests shall be conducted on the well-checked equipment which should also clearly certified its originality and accuracy The testing equipment should be made in United State, Japan, European countries, Russia, China, etc

The laboratory work should be done by the certified laboratory (LAS-XD) and be approved by the owner The LAS-XD must be qualified and equipped to fulfill the demand of testing work and related technical standard

Method Statement for Soil test after Site Leveling Project: VA2 O&M Accommodation

2 Field Test after soil leveling

2.1 Electric resistivity test

2.1.1 Purpose

Electric Resistivity test method is identify the scope of actually resistivity of soil layer after soil leveling to reflected detail design of the grounding systems and corrosion resistance foundation

2.1.2 Equipment

Electric resistivity meter

Equipment name C.A 6470N

The Manufacture Chauvin-Arnoux / France

Measurement modes Apparent resistivity, resistance,

Measurement range 0,001 Ω to 100 kΩ

Output current 1-2-5-10-20-50-100-200-500 mA

Total accuracy < 1 % of reading in most cases

System calibration Calibration is done digitally by the microprocessor

based Data storage Automatically, full resolution reading average and

error 1 are stored along time of each measurement Memory capacity > 2000 measuring points

Photograph Resistivity

meter

Electrode and cable system

- Cables: including several multi-core cables, can be connected to the electrodes through the wire

- The electrode: comprises the metal rod, one end fitted with wires to connect to the cable

- Control box: Connect the electrode system with a resistivity meter, used to control the position of the electrodes when measuring is carried out

2.1.3 Test procedure

Survey line design

On the survey area, the survey lines can play pass through the entire length of the land However, depending on the measured density requirements, which survey line can select multiple lines parallel, perpendicular and equally spaced

Field procedures

Generally, the following steps will be carried out in field

- Identify survey line

- Arrange the electrodes at survey points

- Set up contact electrodes to electrical line

- Connect the electrical line to resistivity meter, as the design configuration

- Set up the resistivity meter according to the designed configuration

- Check connection of the system

Method Statement for Soil test after Site Leveling Project: VA2 O&M Accommodation

- Measurements, record the data, and move all electrodes to the next point of

measurement by switching box until the last point

- Brought back the first position and start measurement similarly with the increase of electrode spacing (a)

- Repeat previous step until completing the line survey

- Transfer data from Resistivity data to the computer for data analysis

Data record

- The recorded data of each point of measurement should include configuration, position, time of measurement, the value of the potential, current, and resistivity It is digitized, stored in the resistivity meter In addition, we also record in the log measurements, double check in the data processing

2.1.4 Quantity of works

The configuration of survey lines

The Electric Resistivity Imaging has been designed by using following parameters:

Electrode spacing : a = lm 3m 5m 8m, 10m

Depth of test: 0.0m - 5m

2.1.5 Data processing and deciphered

- Field data is processed using software

Figure 2: The Arrangement of Electrodes

- This software uses algorithms, inverse problem based on equation minimizes the squared, optimization smooth forced The program converts resistivity values measured (apparent values) into the true resistivity values and performed on cross-sections Compared the values of apparent resistivity and values of measured resistivity Compared process, used until smooth coefficients is optimal

2.1.6 Report the results

The appendices shown detail all the measured result and the chart shown the section

electric, the result deciphered

No Distance (a) m Depth

(m)

ρ (a) apparent ρ (a)

calculate

1

2

…

Figure 3: Chart of relationship resistivity with depth (illustration)

2.2 Plate Load Test

The purpose of Plate load test is determined value of soil elastic module (E 0) by filed vertical load test and Laboratory test to determine cohesive force (C) and internal friction angle (ᵩ) of

soil after leveling Quantity and location of the tests refer to Attachment 1.1 If the test

result is too different from the result from the lab, 02 more plate load tests shall be carried out

- Vertical load test shall be conducted on a plate The test shall be conducted at depths is

Method Statement for Soil test after Site Leveling Project: VA2 O&M Accommodation

bottom of foundation (under lean concrete layer)

- The test procedure shall be in accordance with relevant international standards: TCVN 9354-2012

- For a plate bearing test, the test plate shall be of mild steel and shall be square or circular The test plate shall be 600mm width/diameter The test plate shall be plane and level and

in no case less than 25mm thick

- The test pit at test level shall be at least five times the width of the test plate The pit shall

be logged at all four corners as it is excavated and freshly cut surfaces shall be examined

- The deflection measuring equipment must be set up in such a way that any tilting of the plate will not cause errors in the measurements

- Load test and procedure follow TCVN 9354-2012 Level load test shall be follow: 01Mpa, 0.15Mpa, 0.2Mpa, 0.25Mpa Maximum load test Pmax = 0.25Mpa

The test sequence follow steps:

Method Statement for Soil test after Site Leveling Project: VA2 O&M Accommodation

Experiment soil parameter C, ᵩ by laboratory test:

- Laboratory test will carry out in laboratory After plate load test, test sample will be taking

at the same location and elevation

2.3 Underground water chemical analysis

Underground water chemical analysis test will be carried out on two points with location

as per attachment 1.1

The depth of boring hole should be deep about 15~17m The sample of groundwater shall be taken on each boring hole at filed and laboratory test with below parameter:

- pH

- Cation content Na+, K+, ∑Fe, Mg+, NH4+, Ca+

- Anion content Cl-, SO4 , HCO3-, CO3 , OH

Total of Hardness

- Temporary Hardness

- Permanent Hardness

- Alkaline content

- Free CO2 content

- Corrosive CO2 content

- CO2 content of dried residue 160oC

IV HSSE MANAGEMENT PLAN

The Contractor shall comply with the regulations on the safety work of the project which has been approved by the Local EPC Contractor / Owner approval, specifically as follows:

- Occupational Health and Management Plan no VAII-GA04-P0ZEN-71HCA01

- Environmental Management Plan, no VAII-GA04-P0ZEN-71HCA02

- HSSE Training Plan, no VAII-GA04-P0ZEN-71HCA03

- Personal Protective Equipment no VAII-GA04-P0ZEN-71HCA04

- Permit to Work Procedure no VAII-GA04-P0ZEN-71HCA05

- Risk Management Procedure no VAII-GA04-P0ZEN-71HCA06

- Fire Prevention and Protection Plan no VAII-GA04-P0ZEN-71HCA07

- Scaffolding Procedure no VAII-GA04-P0ZEN-71HCA08

- Electrical Work Procedure no VAII-GA04-P0ZEN-71HCA09

- Tools and Portable Equipment Procedure no VAII-GA04-P0ZEN-71HCA10

- Heavy Equipment and Plant Procedure no VAII-GA04-P0ZEN-71HCA11

- Lifting and Rigging Operations Procedure no VAII-GA04-P0ZEN-71HCA12

- Working At Hight no VAII-GA04-P0ZEN-71HCA16

- Hot Work Procedure no VAII-GA04-P0ZEN-71HCA18

- Security Management Plan no VAII-GA04-P0ZEN-71HCA20

- Traffic Management Plan no VAII-GA04-P0ZEN-71HCA24

Method Statement for Soil test after Site Leveling Project: VA2 O&M Accommodation

- HSSE Incident Management Plan no VAII-GA04-P0ZEN-71HCA25

- Spill Contingency Management Plan no VAII-GA04-P0ZEN-71HCA27

- Air Quality Management Plan no VAII-GA04-P0ZEN-71HCA28

- Wastewater Management Plan no VAII-GA04-P0ZEN-71HCA33

- Waste Management Plan no VAII-GA04-P0ZEN-71HCA34

1 The preventive measures to ensure safety during construction

1.1 Before entering the work area:

- All employees shall be attended HSSE Induction training by HCA HSSE Dept

- Employees must register to enter the site (proper PPE must be worn)

- Construction Equipment must have safety inspection certificate on request and must be

in a state of good quality for safety operation and approved by HCA HSSE Department

1.2 The Health Safety Security and Environment requirements at work:

- All employees shall be attend HSE training appropriate

- Employees must be aware of possible cases of the incident The cause and how to avoid them must be practiced

- The employee must be equipped with adequate protection and required PPE during working time

- Employees must know the alarm and know how to act

- Employees must be aware of safety signals and to protect themselves when the incident happened

- Only authorized personnel can move/ shift safety barriers or safety signs

- Only authorized personnel can change status of the equipment (operational or non-operational)

- Any accident or incident shall be reported promptly to the supervisor on duty and must

be recorded in the books for monitoring safety

- All unsafe conditions or unsafe actions should be reported to the supervisor on duty

- All Dump truck must be protect dust by cover canvas

- Regular spay water for dust control at site

- Flagman/batsman shall be provide at heavy equipment operating