Method Statements For Site Leveling Work

The purpose of this Method Statement is to describe the methodology involved in excavation and initial filling work at the approved area for site access in accordance with the technical standard and EHS requirements of Van Phong 1 BOT Thermal Power Plant Project

Trang 1

Page 1 of 1

WORK

Document No

VP1-1-L4-C-GEN-10004

Update new comments:

(1) Whole picture for requirement compaction of project to be submitted considering common facilities requirement for compaction and drainage system at site to be shown in this stage;

(2) Site excavation and leveling work for ash pond area is poorly documented

(3) MS for offshore portion is not clearly indicated

19/03/2020 (1) Doosan added main drainage system and follow VPCL requested

(2) Doosan noted and added more infomation for Ash pond work

(3) MS for offshore portion will be separated This Ms for aqua farm and water pond only

2

(P7/31)

07/01/2020 Move figure to the right section.

19/03/2020 Doosan noted and repaired

(P10/31)

07/01/2020 Area and tentative volume?

19/03/2020 Doosan noted and repaired

Additional Notes (if any)

* O - Open, C – Closed

5.1 Site Preparation

5.1.4

25 March 2020:

(1) Noted (2) It is kindly noted that per Contract PIII-2 ExhB1 Tech Spec S8 - Civil &

structural - item 8.4.3.6 "Upper 3 m of fills supporting structures / Deeper

fills supporting structures / Dikes for ponds and shore protection will get

required compaction of K95 Kindly reminded on requirements of

permanent dykes area which will be constructed later

See more further comments on page (3) Noted

Closed.

Closed

Trang 2

E 18-Mar-2020 For Approval JH Choi KS Kim YH Lee

METHOD STATEMENTS FOR SITE LEVELING WORK EPC

Doosan Heavy Industries and Construction

EPC DOCUMENT No

Contractor to revise the correction and resubmit

Revise the correction and resubmit before proceeding

Information acknowledged with no comment

Information acknowledged with comments Note: Approval or comment does not relieve the Contractor of

Trang 3

VAN PHONG 1 BOT THERMAL POWER PLANT PROJECT

2

CONTENTS

1 PREFACE 3

2 SCOPE OF WORK AND SCHEDULE 3

3 REFERENCE DOCUMENTS 5

4 RESPONSIBILITIES 6

5 PROCEDURE AND SEQUENCE 7

5.1 Site Preparation 8

5.1.1 Site clearance work 8

5.1.2 Survey work 9

5.1.3 Equipment and Manpower mobilization plan 10

5.1.4 Site Plan, Temporary access, dewatering, disposal area 11

5.2 Excavation soil 14

5.3 Transportation of excavated soil 17

5.4 Initial soil filling 18

6 QUALITY CONTROL 22

7 ENVIRONMENT, HEALTH AND SAFETY (EHS) 23

7.1 EHS General requirement 23

7.2 Site Situation Response and Emergency Response 28

7.3 Medical Emergency Response Plan 30

7.4 Job Safety & Environment Analysis (JSEA) 31

8 ATTACHMENT 38

ATTACHMENT 01 38

ATTACHMENT 02 39

ATTACHMENT 03 40

Trang 4

3

1 PREFACE

The purpose of this Method Statement is to describe the methodology involved in excavation and initial filling work at the approved area for site access in accordance with the technical standard and EHS requirements of Van Phong 1 BOT Thermal Power Plant Project

2 SCOPE OF WORK AND SCHEDULE

This method statement covers the works which related to excavated the soil and backfill the soil in compliance with the applicable codes, standards, design, drawing and specification This is also describes details of EHS requirement, equipment, methodology requirements and Site inspection and Test plan –ITP

Trang 5

4 POWER BLOCKS

ASH POND

Trang 6

5

3 REFERENCE DOCUMENTS

- Drawing

VP1-0-L4-C-GEN-00005_SITE PREPARATION, OVERALL PLAN

VP1-0-L4-C-GEN-00006_SITE PREPARATION, PLAN FOR POWER BLOCK

VP1-0-L4-C-GEN-00007_SITE PREPARATION, PROFILE FOR POWER BLOCK

VP1-0-L4-C-GEN-00010_0_SITE PREPARATION, PROFILE FOR ASH POND

VP1-0-L4-C-GEN-00009_0_SITE PREPARATION, PLAN FOR ASH POND

Trang 7

6

VP1-0-L4-C-GEN-00011_0_SITE PREPARATION, SECTION FOR ASH POND

- Standards and documents related

TCVN 4447:2012- Earth works – Construction, check and acceptance

TCVN 2683:2012 - Soils - Sampling, packing, transportation and curing of samples

22TCN 333:06 - The process of compaction soil, macadam in the

laboratory 22TCN 346: 06 - Determine the compaction of foundation, road foundation with sand cone density test

4 RESPONSIBILITIES

• It is overall responsibility of Site Manager to organize resources prior to perform

construction activities as per project specification in compliance with the quality, schedule

& safety requirements

• EHS Manager is responsible for the overall safety of the construction site His

responsibilities include site inductions ensuring work permits are valid, accident reports, number of person-hours worked and ensuring all works carried out in the safest possible manner consistent with good construction practices EHS Manager will ensure in

coordination with Site Engineer that all measure/construction taken shall be maintained till completion of job

• It is the responsibility of Construction Manager/Site Engineer that construction activities are executed in accordance with this method statement and project specification

• Site Supervisor and Site Safety Officer must unite to prepare the safe workplace condition and provide necessary PPEs, proper tools … for the executer Their duties also included of ensuring the task performed following the approved method and warning any EHS non-compliance case and correct it directly In case of imminent danger, the site supervisor has

to stop the work immediately The Safety officer at site is equally responsible from

stopping the work in the above case

• The QC inspector will ensure that the work is executed according to the requirements of quality are fulfilled

Trang 8

7

5 PROCEDURE AND SEQUENCE

Equipment and tools

Tools

Construction Activities

Preparation work (Confirm existing elevation)

Quality Control, EHS Activities

Excavation work/

Compaction

Compaction, surface finish

Placing and compaction

Trang 9

8

5.1 Site Preparation

5.1.1 Site clearance work

• Before Site leveling work start, site clearance work shall be complete and inspection by

Contractor and Owner including: cutting tress, grass and removing stubs, household waste, demolition of existing building structure, existing asphalt road pavement

Trang 10

9

• For Building structure, use excavator, hydraulic breaker to demolition In case, the height of

structure over 5m such as: post - office shall be filling by soil surrounding:

5.1.2 Survey work

• Survey equipment shall be inspected with full calibration document

• Check existing bench marks where have been installed during soil investigation period,

frequency checked and clarified by certified surveyor or third party

Trang 11

10

5.1.3 Equipment and Manpower mobilization plan

• Equipment mobilization plan

• Manpower mobilization plan

Trang 12

11

5.1.4 Site Plan, Temporary access, dewatering, disposal area

Temporary site office together with its machinery storage area will be set up at the designated location

Temporary access and drainage system shall be changed as per the site condition & CA (Refer to Consortium Agreement attached)

Trang 13

12

• Temporary road system

Trang 14

13

• Temporary Ditch & catch pit for dewatering to existing permanent ditch, if necessary

• Temporary facilities shall be changed as per site condition

• Disposal area arrangement for organic soil and non-used soil shall be approved by the local

authorities prior to commence disposal activities (Refer to the permit attached)

Disposal area for Power Block : 324.527 m2

Disposal area for Ash Pond : 93.700 m2

Volume quantity : not limited

Trang 15

14

• Prior to entering the working area, all equipment and machinery will be inspected by safety

personnel Safety personnel shall be responsible for preparing and providing relevant documents such as related certificate and insurance document for equipment

• Providing all necessary Personal Protective Equipment (PPE) to the manpower and

enforcing them to wear and using PPE, these activities shall be managed during the work

• All machinery, equipment and material shall be access through the designated entrance gate

• Installing pole with flag on the site boundary

5.2 Excavation soil

• Working plan

Trang 16

15

POWER BLOCK

Trang 17

16

ASH POND

Step 1:

• After site clearance, soil will be cut by excavator crawler

• Excavation of each layer about 1-1.5m thickness

• Transporting of Excavated soil will be decided to the filling area or proposed disposal area

by Contractor and Owner

Trang 18

17

• Always arranging watchman for each excavator The standing position of the watch man must be appropriate and outside of the rotation of the excavator

• When excavation in boundary area, keep the distance of the excavator to the edge greater than

4m for fight falling object to the road

Step 2:

• Regularly using auto level or/and total station surveys all excavation area in compliance the design drawing

• Levelling by bulldozer if necessary

• Before compaction, maintain the moisture content of fill material usually +/- 2 percent on optimum moisture If required, add clean water by spray water truck or dry up to fill material

in order to maintain the optimum moisture content

5.3 Transportation of excavated soil

• Excavated soil will be transported to the filling area or disposal area by dump truck

• Access roads at the Site and storage yard shall be controlled by using a spray water tanker at least two times each day

Trang 19

18

• Access roads at the Site and storage yard shall be controlled by using a spray water tanker at least two times each day

• Use of the existing road and make new system road for transport

• All cargo boxes of loaded dump trucks shall be covered for dust protection and wheels shall

be cleaned by water jet and/or wheel washing facility

• Arranging watchman in intersection points, loading and unloading soil

• The national road shall be clean and remove soil, where is the road used for soil disposal

• All cargo boxes of loaded dump trucks shall be covered for dust protection and wheels shall

be cleaned by water jet and/or wheel washing facility

5.4 Initial soil filling

• Working plan

Trang 20

19

Initial soil filling at Power Block

Trang 21

20

Initial soil filling at Ash Pond

Section A-A

Section B-B

• Source material is Excavated soil but shall be approved by contractor and owner

• Filling area surface shall be kept free from water, such as materials and debris

• Fill materials shall be laid, spread and leveled by bulldozer and compacted by roller compactor to the required density Maintain the moisture content of fill material usually +/-

2 percent on optimum moisture If required, add clean water by spray water truck or dry up

Trang 22

21

to fill material in order to maintain the optimum moisture content

• Temporary filling area near intake area (outside of site boundary, aqua farm area) will be filled by excavated soil to utilize as fabrication and storage yard during construction period Slope near seaside will be protected by geotextile not to effect on surrounding environment

• Compacted thickness and density test will be performed as below:

- Phase 1: 300mm thickness of 1 layer, K>=95% for coal yard area, buildings on filling area such as CW chlorination house, Desalination system, WWTP for power block and WWTP for coal yard if pile foundation will not be applied, 1.2m from the top of planed elevation on ash pond and 1m from top layer of Road area

- K>=90 % for other area of phase 1

Typical Backfill Work for Ash Pond

Compaction of under dyke area will be applied to other method statement and soil laboratory test friction, corrosion and weight shall be applied for design of dike wall

- Slope shaping at Ash Pond is 1:1.5(direction perpendicular to edge line of filling and cutting)

- Phase 2: 500mm thickness of 1 layer, K>=90 %

-

- Please check with EPC Contract requirements whether this kind of section be under structures

- Each Layer thickness to be added for compaction -Indicate the max height of this layer ?m

Trang 23

22

- Reclamation area such as aqua farm, water pond and sea area will be filled up to EL+1.65m directly to avoid rise of groundwater level by compaction, 3 set of settlement plate will be installed at the landfill area (by dredging material) to monitor settlement once

a month until completion of this project or until settlement is decreased within 1mm between 2 cycles

Cofferdam for shore protection shall be constructed in advance prior to reclamation on sea area to minimize environment effect

• Any expected value related to quality control (test method, frequency, tolerance ) shall be complied with project technical specification or equivalent standard and related ITP

• Average frequency of testing will be one for each 5,000m2 for phase 1 and 10,000m2 for phase 2 in each layer of general bulk filling Tolerance of elevation: ±10cm for VP1 and +20/-0cm for future area

• Next layer of filling work will be implemented after confirm complete by QC inspector of Contractor and Owner

Trang 24

23

6.4 The Site Inspection and Test Plan (ITP) for this work summarizes various characteristics

to be checked The concerned Site Engineer/Foreman will be responsible to ensure stage wise compliance for these operation and QA/QC engineers of the Contractor will take all responsibilities about delivery of materials and compaction test at site

7 ENVIRONMENT, HEALTH AND SAFETY (EHS)

7.1 EHS General requirement

7.1.1 Proficiency

- EHS Officer shall monitor and cooperate with Site Engineer to ensure that all work is undertaken following EHS Regulation

requirements and attend EHS induction training prior to being allowed to commence work

case occupation

at site for work

a proper safety training course such as WAH, Hot Work, Lifting & Rigging … etc as per the task required

Keep on and continuously TBM and daily safety talk to provide safe knowledge for safe work

Trang 25

24

by qualified person

concerned government agency

Transporting vehicles, etc., will be monitored to prevent overloading and over-filling

allowed by the nation, local and traffic law

Safe inspected label before using

activity is applicable to all personnel at site to reduce the risk of injury and create safe working conditions Housekeeping shall be monitored by the EHS officer, and work will be temporary stop until completion of housekeeping, if EHS officer has found any failure to fulfill this obligation Temp- storage area or stockpile area must be secured / isolated and labeled

leaks occur while filling the fuel, it shall be reported immediately to the Owner and resolved with care

source Labeled and SDS must be presented

is disposed by a hazardous waste disposal company

Tiêu đề	Method Statements For Site Leveling Work
Tác giả	YH Lee, JH Choi, KS Kim, ET Kim
Trường học	Van Phong Power Company Limited
Chuyên ngành	Civil Engineering
Thể loại	for approval
Năm xuất bản	2020
Thành phố	Vietnam

Định dạng
Số trang	49
Dung lượng	8,22 MB