Method Statements For Shore Protection And Temporary Unloading Ramp

Method Statements For Shore Protection And Temporary Unloading Ramp_Method Statements for Method Statements For General Concrete Work Works and to details out the steps to be taken in meeting the technical requirements of Van Phong 1 thermal power plant project

GENERAL INFORMATION

Natural condition

Open, Please see comment on page 3

If so, please stated it inside this MS, page 10

The number of excavator is not enough and DHI to clarify why no use excavator from Apr to Sep, even rock work is continuing until Oct

When installing trailers, transportation blocks are unnecessary due to the careful consideration of quantity and lifting work required for site transport It's essential to assess the suitable capacity of flat barges to ensure stable working conditions, allowing for precise placement during installation Additionally, the absence of crane barges for block installation highlights the effectiveness of alternative methods in achieving the desired outcomes.

Using dump trucks for rock work is unnecessary, as the required quantity of rock materials, averaging 670 m³ per day, can be efficiently supplied by sea Two barges are insufficient to meet this daily demand, highlighting the need for alternative transportation methods to ensure timely delivery.

More detail information about capacity

DHI has been consider and has plan to mobilize more equipment when necessary

DHI has revised and updated on Rev D (section III.3)

DHI has calculated with 02 barge (capacity about 1000T) is enough for transportation rock material In addition, stone can be delivered to sea side through temporary jetty

- The sequence of work in sector L3 is shown as attached figure

- Based on that sample, DHI should make similar to other Sector, and reflect to below chart (should be more detail)

- For sector which done by marine work, please show separately off-shore work and on-shore work (elevation? what layer?)

It conflicts with description in below chapter (offshore work for L5, L4, L3, L2-1)

The work sequence has already been outlined in the Method Statement, with the work methods in Sections 2, 3, 4, and 5 remaining consistent, except for the dumping of core lock from the barge for L3 Please refer to Method Statement Section 5.1 for the relevant drawings and Inspection Test Plan (ITP) The inspection elevation has been discussed during the interface check meeting with VPCL, and detailed elevation and inspection location will be addressed with the Owner or Owner’s engineer during on-site performance evaluations.

DHI has revised and updated on Rev D (section 5.6.1)

Open The Contractor has not considered comments

It related to inspection on site, should make clear on this

Open See comment on page 23

Before start the work (from team 1) the temp work such as stone stock yard, temp access, temp yard should be done first

Current design, L1, L6, L7 structure sector is different with another segment; therefore, it should be described separately

Drawings at page 16, 17 need to be updated in final approved design drawing

Provide execution method at each interface area

Temporary work has been mention on attached #06, and all temp access for work will be use current existing road

Structure of structure L1, L6 and L7 are same so sequence of work is same

DHI has updated drawings at page 16, 17 as same with design drawing submission

On February 7, an interface check meeting was held with VPCL The interface and connection areas will be developed based on design discussions with the relevant subcontractors after reviewing the drawings.

The leveling work must be thoroughly detailed in this manuscript, as it currently lacks comprehensive information on the subject Additionally, it is essential to clarify safety measures when operating a diver in conjunction with an excavator.

Communication method, safety control, how to combine action of diver and equipment when leveling big stone size

19/02/2020 There is nothing improve from Rev.C, or no additional information regarding leveling work under water

Method statements may not encompass all necessary information DHI will carry out the work under its responsibility as the EPC contractor, as outlined in MS (Rev D), specifically in Section 5.6.

19/06/2020 DHI has mention and updated on MS rev E (section 5.6)

Please provide basis or calculation of this value, in order to remove bottom formwork

Also provide the lifting method for review and approval in this

Method statements cannot encompass all information DHI will undertake the work under its responsibility as the EPC contractor, while also incorporating technical guidance from Kogaku (a subcontractor) as detailed in attachment #2.

Cannot find in the MS

We are still not convinced yet Similar comment on page 24

At least the Contractor should describe leveling under water by diver combine excavator as stated in MS

We are still not convinced yet Similar comment on page 28

Provide stability check during block installation: when crane and trailer, blocks come together

19/02/2020 Closed However, please describe clearly your sequence of setting crane for installation of concrete block to avoid slope sliding in Section 6,6

Method statements cannot encompass all necessary information DHI will undertake the work under its responsibility as the EPC contractor However, DHI has outlined its approach in MS (Rev D) (Section V.5.8), ensuring that all safety executions adhere to the HSE detailed manual for L4: VP1-0-L4-H-GEN-00003.

This is not response plan, this table only shows information, there is no response plan

19/02/2020 Closed The response plan still need to be updated and provide sufficient information of contact number, person in charge

DHI has revised and updated on MS (Rev D) (Section 8.1.9)

Provide information in summary items (shore protection, and each sector) such as: q'ty, start, finish date, duration DHI has described on MS (Rev D)-attached #01 04/02/2020

Missing 5.2 Numbering is not correct

DHI has corrected on MS (Rev D)- page 2 DHI has corrected on MS (Rev D)- page 2

Not agree, it should be shown in the MS, please see comment on page 35

We are still not convinced if the Contractor prepare during execution stage, in case accident happen, how to response?

If so, please change the chapter name and attachment name

The temporary jetty is mentioned in this paragraph, figure 2 & figure 4

However, no drawing, no calculation or no construction method, no schedule stated on this MS.

19/02/2020 Open Add parameters on Cross-Sections; Primary calculation on Stability of Gabion in operation condition; location on plan drawing

DHI has updated on MS (Rev D) (Section 5.10)

19/06/2020 DHI has revised and updated on MS Rev.E (Section 5.10)

(P11/51) kindly add relevant water level such as: Mean Sea Water Level…

In design drawings of Shore protection,

WL = +1.910mÐWL = -0.980m Why are they different

Please attach the drawings of temporary facilities as attachment

Please update latest design if any table name from 2.5 to 2.8 please re-arrange.

DHI has revised and updated on MS (Rev D) (Section I.2.3)

DHI has corrected on MS (Rev D) (Section I.2.3)

DHI has revised and updated on MS (Rev D)- Attached #06

Quantity on MS is on the newest drawing version

DHI has revised and updated on MS (Rev D)

After 2 initial sections of Chapter V, as mentioned in Figure 6 the sequence of work, in order to make MS's contents easy to understand, it should be separated into 2 parts:

-Part 2: described in sectors L2, L3, L4 and L5

(Because there are two different structures of shore protection construction)

Re-check the applicable construction method In our opinion, installing core rock should be performed onshore

There is a conflict with Figure 6 Diagram of sequence of Shore protection construction

Please show the stockpile area (location) for each construction direction

There is only this quarry transport by marine method, and the capacity is limitted

We understand that this quarry is mainly for sector L3

Please note that, quarry will supply not only for DHI, other customer also

If the quarry exceeds its mining capacity of 120,000 m³ per year or faces supply challenges due to insufficient equipment or manpower, the Contractor must develop a backup plan This plan should include alternative quarries accessible by marine transport or the establishment of a temporary jetty for loading rock materials onto barges.

Please confirm the offshore construction method for section L2-1?

Safety precautions are essential when vehicles and equipment operate on the top of rock mounts, ensuring a minimum safe distance from the slope Additionally, caution is necessary for divers during crane barge construction activities.

Please refer to previous comment for more detail

Kindly confirm with Kogagu about the acceptance of removal of the Rakuna block’s bottom formwork and transport to stock yard when the minimum concrete strength is 5MPa!

In our opinion, this criteria (5Mpa to remove bottom form and transport) shall affect quality of Rakuna Block!

According to figure 6, installation of precast concrete component is onshore work, if so it should be removed

Noted, in order to avoid any lack of any information due to combination DHI will keep mention like this

Noted, DHI has corrected on MS (Rev D)- Section 5.1

DHI has corrected on MS (Rev D)- Section 5.1; 5.2

We currently have a designated stockpile area for stone to address potential delivery shortages However, depending on the progress of the site leveling work, the Contractor will consult with the Owner to discuss the need for an additional area if necessary.

Well Note, DHI did not only use this quarry but also 5 additional quarry is available, also temporary jetty is considered to make sure amount stone’s delivery for marine work

DHI has revised and updated on MS (Rev D) (Section V.5.6.1)

DHI will provide Safety caution at site when start working

DHI has confirmed with Kogaku, refer to Attached #2

Installation of precast concrete component is on-shore and off-shore work DHI has corrected on MS (Rev D)

Open, See comment at page 17

Kindly confirm with Kogagu about the acceptance of removal of the Rakuna block’s bottom formwork and transport to stock yard when the minimum concrete strength is 5MPa!

According to clause 5.1 Sequence of the construction, onshore method shall be applied for precast components (Rakuna, stone block)

Therefore, these components are transported to barge at temporary jetty is unnecessary

According to clause 5.1 Sequence of the construction, onshore method shall be applied for precast components (Rakuna, stone block)

Therefore, these components are transported to barge at temporary jetty is unnecessary

During re-bar arrangement and formwork, Nylon may be damaged by base stone Lean concrete is better

Review and revise the dimension of stone that is being incorrect with new & updated design version

HWL=1.91m and this is only 0.09m higher

Small waves can climb on dyke

Effective water management is crucial for the temporary unloading ramp's foundation, as it involves either pumping water out or lowering the water level Contractors must accurately calculate the flow entering the foundation hole to assess the feasibility of the construction method.

Provide the calculation of penetrated water flow and number & capacity of pump equipment

From seaside, 1m width of stone ~Geotextile ~ Clay layer ~ 2m width of Stone dyke is better to prevent erosion and seepage

The cross-sectional design of the Temporary Dyke, illustrated in Figure 25, raises the question of its effectiveness in halting water flow when the maximum water level in front of the dyke reaches approximately 2.0 meters.

Disposal of pumped up water should be stated

DHI has confirmed with Kogaku, refer to Attached #2

DHI has revised and updated on MS (Rev D) (Section 5.8)

DHI confirmed that it is on-shore and off-shore works

Noted, DHI will monitor during work if Nylon is damaged during rebar and formwork installation, lean concrete will be replaced

This temporary work is designated for a short duration, specifically from February to July, as indicated by the 2020 tide table published by the Center for Oceanography During this period, the expected high water level is only 0.5 meters, and the waves are mild due to the dry season conditions.

DHI has revised and updated on MS (Rev D) (Section 6.2) and in Attached 06

DHI designed: from seaside 3m width of stone

~nylon/geotextile ~ 2m width clay soil, total top width of dyke is 5m

Based on tide table of 2020 published by center for oceanography, from Feb to July expected high water level is 0.5m only, also wave is mild on dry season

Water will pump to existing aqua farm, and DHI has revised and updated on MS (Rev D) (Section 6.3)

Seepage volume of groundwater should be calculated with number/capacity of pump If crane access is not saved, the countermeasure for dewatering should be considered

This statement should be written in MS

Contractor need to provide the calculation and clarify the feasibility of maintaining the expected water level during construction period

There is a big change from onshore construction in MS Rev A

& B to offshore construction in MS Rev C Contractor is required to carefully check quality of underwater work such as foundation excavation, bedrock compaction and concrete block installation

Using divers Please write down the numerical tolerance

Underwater work at depths of 7 meters can be challenging for divers, often resulting in compromised safety and quality compared to dry work While unloading ramps are designed for temporary use, it is essential that their structural integrity remains solid and durable.

Please specify compressive strength of concrete or curing period

Contractor need to specify the safety distance of crane standing on slope and capacity of crane, working radius for concrete block installation of temp unloading ramp

On the other hand, in the plan at figure 24, there is not enough space for crane and trailer after making open ditch

1 Organization chart of safety department

Provide detailed internal safety plan

Must be inspected daily, weekly and monthly (The Contractor should have internal inspection checklist)

" Work under water " should be stated

Please refer to Attachment 05, and during construction time DHI will monitor and has countermeasure immediately if some happened

DHI shall calculate and arrange suitable pump before execution- Attachment 05

Well note and DHI will check it carefully during while working

DHI has revised and updated on MS (Rev D) (Section VI.6.5) DHI has revised and updated on MS (Rev D) (Section VI.6.5)

Well note, all will be control carefully

All safety matter will be complied with HSE manual detail for L4: VP1-0-L4-H-GEN-00003, and please refer to table 2.8 for crane information

DHI has revised and updated on MS (Rev D) (Section 6.7) Yes, DHI has corrected information

DHI has corrected contain, organization chart has been mention on section 2

DHI will comply with HSE detail manuals for L4(Vp1-0-L4-H- GEN-00003)

Provide a list of rescue facilities Consider the marine safety, rescue boat should be arrange

1 List the facilities, equipment, tools and manpower to fire prevention for each location (for each working area and vessel)

2 Fire prevention procedures should be attached (response flow chart, communication, How to fire prevention and fighting )

Provide emergency Communication network and emergency response flow chart correctly

For example: In case of first aid, broken leg, fatal, unlawful, environment incident -> Who will you inform? What to do for each specific case?

Provides internal inspection checklists for tools and equipment (daily, weekly and monthly)

Provide oil spill prevention plan, list of equipment and tools to prevent oil spills separately for review and approval

Please add this contents: Third party inspection must be performed for all equipment has strict safety requirements (Vietnamese law) Must be listed in detail the equipment will be used

The provided Risk Assessment in attachment 3 is not correct

Provides risk assessment (Likelihood, Consequence, Risk range, Tolerance escriptor ) in according to the Document

No VP1-0-L4-H-GEN-00003 HSE Detail Manuals for L4_ERM, DHI-HSE-HSEM-001 HSE RISK MANAGEMENT

As confirm by Authority, Oil spill is not requirement for this work DHI has revised and updated on MS (Rev D) (Section 8.2.1)

Reference documents

- From VP1-0-L4-C-UZN-04100 to VP1-0-L4-C-UZN-04135

- From VP1-0-L4-C-UZN-06100 to VP1-0-L4-C-UZN-06110

- Part III-2 Exhibit B1 Tech Spec Section 8

- Part III-2 Exhibit B1 Tech Spec Section 8, item 8.4.6 Shore protection

- Part III-2 Exhibit B1 Tech Spec Section 9

- Part III-2 Exhibit B1 Tech Spec Section 9, item 9.4 Rock work

- Part III-2 Exhibit B1 Tech Spec Section 9, item 9.5 Concrete work

- Part III-2 Exhibit B1 Tech Spec Section 9, item 9.6 Structural Steel work

- Design document has approved from Employer No VP1-0-L4-C-SPU-001-A-00001

- Technical Specification for Fabrication and Installation Rakuna Blocks (Copyright from Nikken Corp.)

- TCXDVN 356 - 2005: Concrete structure and reinforced concrete

- TCVN 204 - 1998: Construction project protection - Termite protection for new construction project

- TCXDVN 305 - 2004: Big block concrete - Execution and check and take over procedure

- QCVN 02 - 2009/BXD National technical regulation on data of natural conditions used in the construction;

- TCVN 9901:2014: 1985 Climate data for building design Hydraulic structures - Requirements for sea dike design

- TCVN 2737: 1995 Design standards - and the impact load;

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

- 22 TCN 207-92 Sea-port design standard

- 22 TCN 219-94 River-port design standard

- TCVN 4116:1985 Concrete and reinforced concrete structures of hydraulic engineering constructions Design standard

- TCVN 9346:2012 Concrete and reinforced concrete structures- requirement of protection from corrosion in marine environment

International Standard (will be referred):

- British Standard Code of Practice for Maritime Structures (BS 6349)

- ACI standard : American Concrete Institute;

- AISC standard : American Institute of Steel Construction;

- JIS standard : Japanese Industrial Standards;

- Approach Channels A Guide for Design, published by PIANC, IAPH, IMPA and IALA

VAN PHONG 1 BOT THERMAL POWER PLANT PROJECT

OGANIZATION CHART

• 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

The EHS Manager plays a crucial role in ensuring the safety of the construction site by overseeing site inductions, validating work permits, and managing accident reports They track the number of person-hours worked and ensure that all activities are performed in accordance with best construction practices In collaboration with the Site Engineer, the EHS Manager is responsible for maintaining safety measures and construction standards throughout the project until its completion.

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

The Site Supervisor and Site Safety Officer must collaborate to ensure a safe workplace by providing necessary PPE and proper tools for workers Their responsibilities include ensuring tasks are performed according to approved methods and addressing any EHS non-compliance issues directly In situations of imminent danger, both the Site Supervisor and the Safety Officer are required to halt work immediately to protect the safety of all personnel.

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

PREPARATION WORKS

Survey work

• Survey equipment shall be inspected with full calibration document

During the soil investigation period, existing benchmarks were installed and documented in the "VP1-0-L4-C-GEN-00002 Topographic & Bathymetric Report (Rev.C)" submitted to the owner Following this, the contractor verified the handover benchmarks and established a new benchmark system for the construction of shore protection, as detailed in the table below.

Table 2.2 Table of coordinate and elevation

No Name Coordinate Elevation Remark

Every month, the contractor conducts a periodic survey of the coordinates and elevation of the temporary benchmark system Based on the results of these surveys, the contractor calculates the tolerance and updates the benchmark system to ensure alignment with the benchmark data.

Prior to initiating rock works, the designated placement areas for rock materials will be clearly marked using stakes or buoys To ensure compliance with specifications and approved shop drawings, leveling elevations will be monitored with survey equipment, including Total Station and RTK-GPS/DGPS technology.

Material, Equipment and Manpower mobilization plan

Mobilization involves acquiring and transporting materials, personnel, construction equipment, and all essential items to the Site for the successful execution and completion of the Works This process also encompasses the setup and installation of all necessary equipment and facilities.

VAN PHONG 1 BOT THERMAL POWER PLANT PROJECT until it is rendered operational It will include a sufficient supply of spare parts of the constructional plant

If repairs exceed the capabilities of on-site personnel or tools and require the construction equipment to be removed, the Contractor will supply a replacement machine, equipment, or plant of comparable capacity.

The mobilization schedule will encompass essential preparatory tasks and operations, including the movement of personnel, equipment, supplies, and other necessary items to the project site It will also cover all required activities and associated costs, such as the establishment of the Contractor's Camp, before commencing work on the various project components.

- The number of employees will be arranged in accordance with the construction progress of each work item and the whole package

Table 2.3 Quantity of shore protection

12 Stone Block 3T End Type Nos 792

13 Stone Block 3T Shoulder Type Nos 302

14 Stone Block 3T Convex Type Nos 1093

Table 2.4 Quantity for Unloading ramp

Table 2.5 Equipment’s mobilization for shore protection

In the period from January 2020 to April 2021, various equipment was utilized for shore protection work, including a significant number of crawler cranes, excavators, and bulldozers The inventory showed consistent use of 100-150T crawler cranes, with a total of 12 units deployed over the months Additionally, 45T tire cranes were employed continuously, reflecting a steady demand The construction efforts also featured 25 units of excavators and various other machinery like concrete batching plants and generators, crucial for key activities Equipment usage peaked in specific months, demonstrating the project's dynamic needs and resource allocation, ultimately culminating in a total of 60 units across different categories by April 2021.

Table 2.6 Manpower mobilization for shore protection

From November 2019 to December 2021, the construction project experienced fluctuations in key personnel, with notable positions including Project Managers, Construction Managers, Design Managers, and various engineering roles The total number of key personnel peaked at 232 in November 2019, with a gradual decline to 26 by December 2021 Throughout this period, the number of Design Engineers and Site Engineers varied significantly, while the number of QA/QC Managers remained consistent The construction teams, including the Formwork, Rebar, and Casting Concrete teams, maintained a steady presence, contributing to the project's overall progress Additionally, the Construction Survey team showed fluctuations, reflecting the dynamic nature of the project.

Table 2.7 Equipment’s mobilization for Temporary Unloading ramp

From January 2020 to December 2021, various construction equipment was utilized, including three excavators with a capacity of 1.6-2.4m, two dump trucks, and a crawler crane with a capacity of 150-250 tons Additionally, a concrete batching plant with a capacity of 60m³/h and a concrete pump of the same capacity were consistently employed Four mix trucks with a capacity of 6-10m³, a generator ranging from 200-400 KVA, and essential machinery such as welding, bending, grinding, and compressor machines were also in operation The total number of equipment items fluctuated, with a peak of 21 units recorded Throughout this period, the availability of leveling machines and a total reflectiveness station remained steady, indicating a robust operational framework for construction activities.

Un it Qty No Equ ipm en t

Table 2.8 Manpower mobilization for Temporary Unloading ramp

From November 2019 to December 2021, key personnel in construction management included project managers, construction managers, design managers, and various engineering roles, maintaining a consistent presence The number of site engineers fluctuated, peaking at five, while labor contributions varied significantly, with a notable increase in in-situ concrete work and precast concrete fabrication The excavation and filling activities saw a steady workforce, reflecting the project's demands Overall, the total workforce ranged from 13 to 140, highlighting the project's evolving scale and complexity over the observed period.

SHORE PROTECTION CONSTRUCTION

Sequence of the Construction

Figure 5 Diagram of sequence of Shore protection construction

Construction

- Following the required schedule, The Contractor will be divided 4 teams of construction shore protection

- Before starting constructions all temporary works such as stone stock yard, temporary access road, will be constructed Temporary jetty will be constructed with core rock work of sector L5

On-shore/Off-shore Core Rock Inst

On-shore Core Rock Inst

On-shore Core Rock Installation

On-shore/off-shore Rakuna 8.0T Blocks Installation

On-shore/off-shore Rakuna 4.0T Blocks Installation

Reject Reject Reject Reject Reject

 Team 1: Execution Section L5 from Km0+760 to Km0+920; Section L4 from Km1+080 – Km0+920;

 Section L5 executed by on-shore method for rock installation and Rakuna installation

 Section L4 using on-shore method rock installation; on-shore Rakuna blocks installation;

 Team 2: Section L2-1 from Km1+720 - Km2+040 and Section L2-2 from 1+560 – Km1+720

 Section L2-1 executed by on-shore method for installation of rock

 Section L2-2 is executed by on-shore method for installation of rock and Rakuna blocks

 Team 3: Execution Section L3 from Km0+080 – Km1+560;

 Section L3 using combination between off-shore and on-shore method for rock works; on-shore Rakuna blocks installation;

 Team 4: Execution Section L1 from Km2+040 – Km2+641.87; Section L6 from K0+000 – 0+760m and L7 from K0+000 – Km0+080

 All sections of Team 4 is carried out by on-shore method for excavation and rock installation

- The Contractor will implement by rolling method and small section will be divided from 70 - 100 m in length

Figure 6 Layout of construction direction

Rock Supply and Transportation

- Rock will be supplied by the quarry which will be submitted by MAS latter and approved by Owner and Consultant

1 Nui Sam Quarry Pit exploited by Khanh Hoa Material Equipment’s Construction JSC

2 East Nui Sam Quarry Pit exploited by Construction No.1 Limited Company

3 Bo Da 2 Quarry Pit exploited by MANHCUONG Limited Company

4 Gioc Mo Quarry Pit is exploited by ADC Architecture Designing Construction Consulting Co Ltd Capacity of quarry: 350.000m3/year

5 Hon Ngang Quarry Pit is exploited by Thanh Danh Company

6 Ho Sau Quarry Pit exploited by Khanh Hoa Material Equipment’s Construction JSC is exploited by ADC Architecture Designing Construction Consulting Co Ltd Capacity of quarry: 120.000m3/year

Stone and rock will be transported to the construction site by trucks with a capacity of up to 15 tons The approved quarry is located approximately 20 kilometers from the site, allowing for a daily delivery of about 1,000 cubic meters of rock by land.

- Mainly rock material is transported by road way and a part by waterways

We plan to transport materials via waterways to the Contractor's site and temporary yard, as indicated in the construction layout The transportation will utilize self-propelled barges, with the option of tugboat assistance when necessary.

Material collected via waterway and roadway is transported to the shore using a clamshell crane positioned on a temporary jetty, as illustrated in the General Plan of Section I.

“General Information” in combination with a dump truck

- Rock will be classified as type of design before transportation and installation

- In case of storm come during construction, the contractor will use Rakuna block which are fabricated to cover and protect the placed rock part

Figure 7 Typical construction of rock work

- The scope of work is the construction of shore protection (Km0+000 – Km2+630)

- The settlement monitoring device will be set up after finishing core rock placing

Monitoring the settlement of the underground seabed beneath shore protection materials is crucial during both construction and operational phases It is essential to assess the settlement limits of the dike to ensure that any necessary settlement compensation aligns with the specifications outlined in the design drawings.

+ To early forecast risks of the dike then resolve problems effectively

+ To provide data for designing and constructing more effectively, more safely for the future works

Shore protection settlement refers to the sinking of the underground seabed beneath the protective materials placed above, known as foundation settlement This process involves the rearrangement of the granular layer, primarily composed of sand, leading to a gradual decrease in settlement over time.

- Installation of settlement monitoring devices and define the transferred benchmarks: The settlement monitoring device is made by concrete size top: (0.2x0.2)m, bottom: (0.3x0.3)m and the height is 0.2m

Figure 8 Typical section and detail of settlement monitoring device

The project will involve surveying two key locations: the land side centerline and the sea side centerline Each point will be assessed individually to ensure the Contractor obtains accurate data and resources necessary for construction.

The settlement monitoring process will be divided in these following steps:

+ Step 1: After the devices are installed at designed points successfully, the Contractor will carry out monitoring to achieve the initial level

+ Step 2: Monitor during period of core stone work 7 days one time, this work will be completed when the core stone level satisfied the approved designation

+ Step 3: Report the Engineer the settlement monitoring records

In which: Δ 1: Compensation data while carry out core stone work Δ 2: Compensation data officially issued by the Engineer

- Geotextile material shall be submitted and approved by owner and engineer before using

- Geotextile will be laying based on construction drawings was approved

Geotextiles will be provided in rolls that are clearly labeled with their length, width, type, and weight Each roll will be packaged in black plastic to ensure protection from direct sunlight during transportation and storage.

To ensure an effective filter layer, geotextiles must be installed on well-leveled surfaces, avoiding kinks and creases Joints in the geotextile should either overlap by a minimum of 0.50 meters or be seamed with an overlap of at least 0.1 meters.

- Direction of placing geotextile: The Contractor will carry out from shore side to seaside and from top to bottom

Vehicles and construction equipment must not be placed directly on the geotextile until a sufficiently thick layer of fill is applied on top This fill should be carefully distributed over the geotextile using a dozer to ensure proper protection and stability.

- Any damage to the geotextile shall be the Contractor’s responsibility Repair or replacement shall be done at the Contractor’s cost to the satisfaction of the Engineer

When installing geotextile filter fabric, it is essential to follow the manufacturer's guidelines precisely Ensure that the joints between adjacent sheets of the fabric are positioned perpendicular to the slope's base for optimal performance.

- Placing geotextile filter fabric will be executed by manpower

Figure 9 Typical construction of Geotextile

5.6 Filling for Shore Protection Structure

Shore protection construction must adhere to the specified lines and levels outlined in the Drawings, encompassing both onshore and offshore activities This process involves multiple layers, including stone core rock weighing between 1 Kg and 300 Kg, as well as armor rock ranging from 200 Kg to 600 Kg, and additional rock sizes from 1 Kg to 30 Kg.

- For the section of L5: the core rock layer will be placed wider width from 5.583m to 10m in width for transportation truck and excavator working

The core rock layer will be installed from section L4 to L3, featuring a designated width and extending 50 meters in length To facilitate the movement of construction equipment, the width of the top core rock will be expanded to 10 meters.

Figure 10 Plan of core rock for L4, L3

- Tolerance of stone work is followed to 22TCN 289 which is shown in ITP will be submit to owner for approval in others document

- All kind of rock will be transported to the construction site Off-shore construction shall be applied for section L3

- The Contractor shall be take advance of tidal water level for offshore construction

Offshore execution of approved filling materials must utilize controlled tipping methods, progressing from the banks as depicted in the Drawings, or from pontoon-mounted construction equipment or barges, subject to the Engineer's approval.

Prior to implementation, it is essential to establish the alignment and elevation of each layer of the revetment structure The filling must be positioned at a higher level than adjacent layers, with gradients on the fill surface not exceeding the specified design limits when transitioning from one level to another.

- Rock material will be transported to the placing area by flat barge 600T in combination with tugboat 350CV

- Clamshell 2.3m3 or backhoe 0.7 – 1.0m3 placed on pontoon 600T will loaded rock material to exact location of placing Using diver to trim and grade as design level and required slope

Levelling will be performed using a clamshell or backhoe mounted on a stone barge, in conjunction with a diver The tolerance for this process is outlined in the Inspection and Test Plan (ITP) The diver will strategically position stones underwater to ensure a flat surface.

Figure 11 Typical construction of rock work (off-shore)

Placing geotextile

- Geotextile material shall be submitted and approved by owner and engineer before using

- Geotextile will be laying based on construction drawings was approved

Geotextile will be delivered in rolls clearly labeled with their length, width, type, and weight Each roll is packaged in black plastic to ensure protection from direct sunlight during transportation and storage.

To ensure an effective filter layer, geotextile must be laid out on well-leveled surfaces, avoiding any kinks or creases Joints should either overlap by a minimum of 0.50 meters or be seamed together with an overlap of at least 0.1 meters.

- Direction of placing geotextile: The Contractor will carry out from shore side to seaside and from top to bottom

Vehicles and construction equipment must not be placed directly on the geotextile until a sufficiently thick layer of fill has been applied on top This fill should be carefully spread over the geotextile using a dozer to ensure proper support and protection.

Geotextile filter fabric must be installed following the manufacturer's guidelines, ensuring that the joints between adjacent sheets are aligned perpendicular to the slope's base.

Figure 9 Typical construction of Geotextile

Filling for Shore Protection Structure

Shore protection construction must adhere to the specified lines and levels indicated in the Drawings, encompassing both onshore and offshore execution This process involves multiple layers, including stone core rock weighing between 1 Kg and 300 Kg, as well as armor rock in the ranges of 200 Kg to 300 Kg and 400 Kg to 600 Kg, along with smaller rocks weighing from 1 Kg to 30 Kg.

- For the section of L5: the core rock layer will be placed wider width from 5.583m to 10m in width for transportation truck and excavator working

In the transition from section L4 to L3, the core rock layer will be installed with a specified width, extending every 50 meters To facilitate the movement of construction equipment, the width of the top core rock will be expanded to 10 meters.

Figure 10 Plan of core rock for L4, L3

- Tolerance of stone work is followed to 22TCN 289 which is shown in ITP will be submit to owner for approval in others document

- All kind of rock will be transported to the construction site Off-shore construction shall be applied for section L3

- The Contractor shall be take advance of tidal water level for offshore construction

Material designated for offshore execution must be placed using controlled tipping methods, progressing from the banks or utilizing pontoon-mounted construction equipment or barges, as authorized by the Engineer.

Before implementation, it is essential to define the alignment and elevation of each layer of revetment The filling must be positioned at a higher level than adjacent layers, using gradients that do not exceed the design specifications when transitioning from one level to another.

- Rock material will be transported to the placing area by flat barge 600T in combination with tugboat 350CV

- Clamshell 2.3m3 or backhoe 0.7 – 1.0m3 placed on pontoon 600T will loaded rock material to exact location of placing Using diver to trim and grade as design level and required slope

Levelling will be conducted using a clamshell or backhoe mounted on a stone barge, assisted by a diver The diver will carefully position the stones underwater to create a flat surface, adhering to the tolerances outlined in the Inspection and Test Plan (ITP).

Figure 11 Typical construction of rock work (off-shore)

Rock materials from quarry pits are essential for construction projects and will be categorized based on design specifications Each type of rock will be strategically positioned at the construction site according to the predetermined design layout.

For onshore execution, all rock fill must be placed in uniform layers of specified thickness and in a systematic order No section of the fill should exceed another in height, except for gradients that do not surpass 1:2 for sections L1, L6, L7, and L2-1, and 1:4/3 for sections L3, L4, L5, and L2-2 Unless specified in the Drawings or directed by the Engineer, the fill should be sloped at right angles to the center-line of the shore protection, both upstream and downstream, to ensure proper drainage and prevent water accumulation The slope must adhere to the stated limits, with the highest point located at the center of the shore protection.

Rock will be delivered directly by dump truck or loaded and leveled using an excavator with a capacity of 0.7m³ to 1.0m³, supplemented by manual labor Skilled workers will be employed to trim and grade the rock to meet the specified design levels and required slopes.

- Levelling will be done by excavator combined with manpower

Figure 12 Typical construction of rock work (onshore)

Fabrication of Precast Concrete Components

5.7.1 Process Chart of fabrication precast concrete components

Figure 13 Diagram of fabrication precast concrete component sequence

Remove Formwork side after 1 day

Remove bottom formwork and Transport to Stockpile Yard

Rebar Hooks Fabrication and Installation

Checking Concrete Strength of Sample

Checking Concrete Strength of Sample at 28 days age

Acceptance of Form and Dimension

Acceptance of Formwork and Rebar Installation

5.7.2 Production of Precast Concrete Components

Precast works will be carried out for Rakuna and concrete blocks used in the Temporary Unloading Ramp The concrete strength for both the Rakuna block and the concrete block is designed to reach 25 MPa at 28 days, adhering to specifications VP1-0-L4-C-UXY.

- All parameter of Rakuna block shall be follow attachment of Rakuna

Precast concrete components will be produced in full compliance with the specified requirements, drawings, and applicable procedures The manufacturing process will adhere to approved methods for concreting, steel reinforcement, and formwork to ensure high-quality results.

Once the finished products have cured properly and reached the required strength, they will be removed from the molder A thorough inspection will then be conducted to assess their physical characteristics, including smoothness, uniform texture, and the presence of any holes, fins, or stains.

- Then, these units ready for installation at site will be temporarily stored in the stockpile properly considering any possible risk that may damage its quality while storing

- Fabrication Rakuna: With 22 formwork sets and 11 bottom plates of rakuna 4T, 52 formwork sets and

The fabrication process involves producing 26 bottom plates of Rakuna 8T daily, alongside 11 Rakunas 4T The fabrication yard dimensions are 27x120 meters After three days, the casted Rakunas are temporarily stored in the stock yard before being relocated to the backfill area adjacent to the revetment sectors L3, L4, and L5.

- The tolerance of concrete cover is shown in ITP, test slump of concrete for each concrete truck and taking sample of concrete for each 150m 3

Figure 14 Typical construction of Rakuna fabrication

- Prior execution, the Contractor shall submit detailed design drawings of each type of precast concrete components, subject for approval of the Engineer

Concrete block forms will be constructed from wood, metal, or other materials approved by the Employer These formworks will be precisely fabricated and designed to meet the requirements outlined in the specified Drawings and Specifications.

Before pouring concrete, all formworks must be thoroughly cleaned of dirt, debris, and harmful materials Additionally, the interior surfaces that will come into contact with the concrete should be coated with an approved preparation to ensure that the concrete does not adhere to them.

- Prior to concreting, stop-ends may be treated with an approved surface retarder, instead of formwork oil, if required, to facilitate the exposing of the coarse aggregate

Formwork will be precisely fabricated and designed in accordance with the specified drawings and specifications, ensuring suitability for each pile location within the temporary facilities area Adjustments will be implemented to accommodate potential shrinkage, settlement, or deflection during construction, guaranteeing that the final products meet the required dimensions and shapes The forms will be securely aligned with separators and form ties to withstand the lateral pressure exerted during concrete casting.

- Formwork will be installed by crawler crane in combination with manpower

Before pouring concrete, it is essential to clean the soffit form of any dirt, debris, or harmful materials Additionally, the interior surfaces that will come into direct contact with the concrete should be treated with an approved preparation to ensure proper separation and prevent adhesion.

- On removal of the forms, it will be assured that in removing the formworks no striking or vibration will be done in order not to damage the concrete

Before removing props or formworks, it's essential to first expose the concrete surface to ensure it has hardened adequately The removal of forms should be conducted with extra care to prevent any potential damage.

- After finish the formwork installation, the Engineer will inspect for next step

- All reinforcing bars to be delivered and schedule for fabrication shall conform to the requirement as Design Drawing and Technical Specification

- Rebar cutting and bending shall be executed within the temporary yard and assembled in accordance with the approved shop drawing and approved bending schedule

- The length of reinforcement overlapping is follow to standard drawings

- All relevant test certificate of mill steel will be checked before use

- All fabricated rebar shall conform to the following fabrication tolerances as specified in technical specifications

The installation of reinforcing bars must adhere strictly to the dimensions and locations specified in the approved shop drawings It is essential that the reinforcement is securely fixed in the designated positions to ensure structural integrity.

- Placing and installation tolerances shall comply on the requirements After the reinforcement bar has been properly placed and secured, assembly and fixing of formwork shall then proceed

To ensure proper coverage of rebar with concrete, it is essential to install spacer blocks that maintain the correct positioning of the reinforcement bars These spacer blocks should match the quality and strength of the concrete being poured, guaranteeing structural integrity and durability.

All activities related to concrete production, including material supply, batching, mixing, transportation, testing, and quality control, will adhere strictly to the requirements and specifications approved by the Employer The concrete used in the Works will fully comply with the Technical Specifications and Design standards.

- After formwork and reinforcement is acceptance, implementation of concreting works following the method corresponding with partitioned areas The direction of execution already mentioned as above

- Concreting pouring direction is according to a unified alignment Where place is already placed

VAN PHONG 1 BOT THERMAL POWER PLANT PROJECT concrete then immediately compacted, fulfillment from one end to other end of beam

- The compaction shall be done immediately soon after concrete to be placed and done constantly, to complete from this end to another end of the beam

- The placing shall be done with vertical direction, no strike against the rebar and formworks during the compacting shall be occurred to prevent the displacement of rebar

Before pouring concrete for the next section, it is essential to properly prepare the construction joint This involves cleaning and chiseling the surface of the previously poured concrete to create a rough texture Additionally, the joint should be thoroughly wet and cleaned to minimize shrinkage between the new and old concrete in the beam system.

- Arrange equipment and manpower stand by to ensure the casting must be proceeding continuously, not discontinued or standstill

- Casting duration have to be completed as soon as possible to avoid effecting the quality of concrete

To ensure optimal concrete placement, mechanical vibrators with a diameter compatible with steel reinforcement spacing and high-frequency capabilities will be utilized This technique guarantees thorough filling around the reinforcement and in all corners of the forms Vibrators will be submerged at regular intervals to adequately vibrate the concrete, while careful attention will be paid to prevent displacement of the steel reinforcement Additionally, vibrators will be withdrawn gradually and vertically from the fresh concrete to avoid the formation of air pockets.

Once the concrete is positioned at its final level, all compaction, vibration, and finishing processes must be completed To prevent distortion, no activities should occur over the freshly placed concrete until it has adequately hardened.

Installation of concrete Precast Components

Precast concrete components are efficiently transported from the stock yard to the construction site using trailers or dump trucks for on-shore projects For offshore operations, these components are first delivered to a temporary jetty by 40-ton trailers, where they are then loaded onto a 600-ton barge using a 100-ton crawler crane This streamlined process ensures that the precast elements reach their designated erection locations safely and effectively.

- Use floating crane or crawled crane placed on body of shore protection to install the precast concrete components in place

- The erection of precast concrete component is executed following the chart bellows

Figure 15 Precast components installation sequence

Before installing precast concrete components, it is essential to clean the resting locations thoroughly The installation process begins with correctly hoisting the production item into its designated position.

Once the item is raised to the correct height, it should be rotated using a cable to ensure the precast concrete components are accurately positioned As the item is lowered, installers in the designated areas must adjust it to ensure it rests evenly on the consoles, maintaining equal distances from the pile cap.

- The concrete placing shall be mentioned as above, however some issues must be added for this execution as bellows:

Precast concrete components are initially transported from the stockpile yard to a temporary jetty before being lifted onto a barge Each transport involves loading the barge with a sufficient quantity of precast components needed for the installation of either an approach trestle or a main wharf To ensure balance during the installation process, precast components are evenly distributed on both sides of the barge, and the installation work is conducted sequentially on each side to maintain stability.

 After moving to installation location, barge needs to be fixed on right place to ensure correct of erecting process

 Before unloading precast concrete components from barge, it is necessary to fix barge by anchors and check carefully cross beam surface to ensure no obstacles in installation

 Precast concrete components will be erected respectively from furthest point of barge into nearest point of barge

During the barge erection process, it may be necessary to relocate the barge to a more suitable distance for installation The contractor is responsible for moving the barge and securely anchoring it before proceeding with the next phase of installation.

Loading to Barge and Transport to Erection Location

Erection Equipment Crawler Crane/Floating Crane

Check Yes Installation of Next Blocks

Deliver Directly Precast to the

The installation of precast concrete components primarily relies on a floating crane, which includes a barge and a crawler crane It is essential to secure the crane onto the barge and conduct a thorough safety performance check before use The barge used for this operation measures 45 meters in length, 12 meters in width, and has a draft of 2 meters.

- After the precast components installation finished and reinforced for safety, then site engineer shall inform the consultant to inspect and accept the installation works

Figure 16 Transport Concrete block to stock yard

Figure 17 Transport Concrete block to temporary jetty, to the site

Figure 18 Installing concrete block on-shore

Figure 19 Installing concrete block off-shore

RC wall works

To prevent dehydration of the concrete, a layer of nylon will be placed at the joint between the base and the in-situ concrete wall Additionally, a slump test will be conducted for each concrete truck, and concrete samples will be taken for every 150 m³ of concrete poured.

- After R.C Wall’s formwork and reinforcement is acceptance, implementation of concreting works for beam following the method corresponding with partitioned areas The direction of execution already mentioned as above

- Concreting pouring direction is according to a unified alignment Where place is already placed concrete then immediately compacted, fulfillment from one end to other end of beam

- The compaction shall be done immediately soon after concrete to be placed and done constantly, to complete from this end to another end of the beam

- The placing shall be done with vertical direction, no strike against the rebar and formworks during the compacting shall be occurred to prevent the displacement of rebar

- Arrange equipment and manpower stand by to ensure the casting must be proceeding continuously, not discontinued or standstill

- Casting duration have to be completed as soon as possible to avoid effecting the quality of concrete

Figure 20 Installing re-bar of RC.Wall

Figure 21 Installing formwork of RC.Wall

Figure 22 Installing concrete block offshore

Temporary Jetty

Figure 23 Plan of Temporary jetty

Figure 25 Installation plan of concrete block

5.10.2 Sequence of construction for temporary jetty

Figure 26 Sequence of temporary jetty construction

TEMPORARY UNLOADING RAMP

Sequence work

Figure 27 Temporary Unloading ramp work sequence

Placing Rock 15 – 100Kg at Bottom of

Construction of Fillter Layer 1 – 30Kg Installation of Non-woven Geotextile

Temporary dyke removal and Construction of Aggregate base

Rock installation Concrete Block installation

Construction of Temporary Dyke

Temporary dyke shall be constructed with stones and clay roof inside for waterproofing of the temporary dyke The construction shall be performed in the following sequence:

3 Step 3: Form stones in trapezoid (with top up to 3.0m width, and elevation of +2.0m)

4 Step 4: Form clay layers with filling and proper tight compaction inside (top width of 2.0m)

Geotextile or nylon will be installed between stone and soil layer to avoid any soil spill out

A water sump pit should be installed within the temporary dyke to facilitate drainage during construction It is essential to implement a pumping system with a capacity designed to effectively manage the drainage needs of the foundation pit.

After finishing temporary dyke the contractor shall test absorbent quantity to verify the calculation

Figure 28 Plan of temporary dyke

Figure 29 Cross section of temporary dyke

Excavation Foundation Pit of Unloading Ramp

- Excavation for Unloading Ramp’s foundation pit will be divided to 2 section as follows:

Excavation in underwater conditions requires effective dewatering to lower water levels, facilitating crane access and optimizing its capacity To achieve this, water is pumped to a nearby pond adjacent to the Temporary Unloading ramp.

- To remove rock layer, the contractor use concrete chisel machine to break the rock layer then use excavator to remove them out

- Excavation will be carried out mechanically using backhoe, will be also performed at the bottom of the excavation, slopes and other necessary areas

Excavated soil deemed suitable will be transported directly to designated filling areas for use in backfilling and other structural applications as instructed by the Engineer Conversely, any soil identified by the Engineer as unsuitable for filling or backfilling will be removed and taken to a designated disposal area as waste.

All excavation work will be completed to achieve a smooth and uniform surface, ensuring no materials are wasted without prior approval from the Engineer The excavation will reach an elevation of 0.50m to facilitate the construction of the slope and rubble backfill.

In excavation areas and locations designated for embankment placement, suitable topsoil will be removed to the specified depth as outlined in the project specifications or as directed by the Engineer This topsoil must be entirely extracted before commencing regular excavation or embankment activities and will be stored separately from other excavated materials for future use.

- Any material surplus to these requirements or any material declared by the Engineer to be unsuitable will be disposed outside maneuvering area or as directed by the Engineer

Production of Concrete Blocks

+ Fabrication, transportation and casting concrete blocks A, B, C, D and E

+ Handling and transportation from casting yard to stockpile yards

After removing the formwork, it is essential to promptly inscribe symbols on the precast concrete components These symbols should be written in red paint, with a letter size ranging from 2.5 to 3.5 cm, ensuring clarity in the markings.

+ Type of precast concrete component

+ Date, month, year of casting of precast concrete component

Precast concrete components, once adequately cured and achieving the required strength, will be transported to the stockpile yard using a 100-ton crawled crane in conjunction with a 40-ton trailer.

Figure 31 Casting concrete of concrete block

Placing rock 15-100Kg at bottom of concrete block

- This items including execution of rock fill 10 – 60Kg layer thickness 1.0m in bottom

- Rock material used for fill shall be selected by the Contractor and approved by the Engineer

- Fill shall be placed by such methods as will prevent segregation and loss of the material, and to lines and levels shown on the Drawings

- The Contractor shall be used onshore construction for suitable with execution construction

- Material approved as filling execution shall be placed using controlled tipping methods advancing from the coastal banks, as shown on the Drawings

Before implementation, it's essential to define the alignment and elevation of each layer of the embankment structure The filling should be positioned at a higher level than the adjacent layers, utilizing gradients that do not exceed a ratio of 1:1.5 from one level to the next.

- Rock material will be transported to the placing area by dump truck 10 – 15T in combination with excavator 0.7 – 1.0m3 and clamshell 2.3m3

- Excavator or backhoe 0.7 – 1.0m3 placed on-shore will be loaded rock material to exact location of placing Using diver to trim and grade as design level and required slope

- Tolerance of elevation will follow 22TCN 289-02 (± 20cm)

Figure 32 Construction rock of Unloading ramp

Installation of concrete block

- Concrete block is fabricated at fabrication yard, after concrete strength is enough (80% R28) for installation, concrete block is transported to the site by truck

- At the construction site proceed position scope construction by total reflection station, marked by signal pile system;

The installation process involves utilizing an onshore crane in conjunction with labor to place concrete blocks, starting from the first layer of Concrete Block Type E and progressing to the fifth layer of Concrete Block Type A Following this, precast coping units CP1, CP2, CP3, and CP4 are installed, along with fender blocks that are securely attached to Concrete Block A, suspended from Steel I160, as detailed in the attached documentation.

- Check, inspection forward to next step of construction

Figure 33 Concrete block installation of Unloading ramp

Stone Rubble backfill (15-100)Kg and Armor stone 100-200Kg work

Rock fill weighing between 15-100Kg and 100-200Kg must be installed in uniform layers of approximately 500mm thickness, following a systematic sequence It is essential that no section of the fill exceeds the height of another, except where gradients to the fill surface do not exceed a ratio of 1:5 from one level to the next.

- Except as shown in the Drawings or as otherwise directed by the Engineer, the filling shall be in layers laid to a slope at right angles

- Rock material will be transported to the placing area by dump truck 10 – 15T

- Rock material will be loaded and leveled by excavator 0.7 – 1.0m3 in combination with and manpower

- Using manpower to trim and grade as design level and required slope before move to next steps of execution

Figure 34 Construction of Rubble backfill and Armor stone

Construction capping beam

- A part of capping is conducted by precast as mention on section 6.6 and on drawing at attachment 8

- Top Capping beam will be carried out at site with in-situ concrete grade C35

Figure 35 Construction of capping beam

Filter stone (thickness 500mm)

- The filter layer including geotextile and filter stone 1 – 30Kg thickness 500mm

- The rock 1 – 30Kg is transported by dump truck 10 – 15T and placed by methods that avoid segregation: end dumping, dumping into chutes placing or moving by excavator 0.7 – 1.0m3

To prevent damage to rock riprap, it is crucial to avoid crushing or breaking caused by machine tracks Each truckload delivered to the site must include a full spectrum of rock sizes to ensure proper gradation.

- Stones are placed from the base of the slope to the top in one operation Care is required in placing rock to avoid disturbing the filter layer(s)

- Often the surface of the rock is left rough However, in some circumstances, quarry spalls are used to fill voids in the revetment surface creating a smoother surface

Figure 36 Construction of Filter stone

Geotextile works

Once excavation and surface preparation are finalized, the Contractor must implement measures to protect the surface from deterioration prior to the start of construction Should any deterioration occur, the Contractor is responsible for performing remedial work deemed necessary by the Engineer.

Geotextiles will be provided in rolls, clearly labeled with their length, width, type, and weight Each roll will be packaged in black plastic to safeguard it from direct sunlight during both transportation and storage.

To ensure an effective filter layer, geotextiles must be laid flat on properly leveled surfaces, avoiding any kinks or creases Joints in the geotextile should overlap by at least 0.50 meters or be seamed with a minimum overlap of 0.25 meters.

- Vehicles or construction equipment shall not be allowed on touch the geotextile Such fill shall be placed carefully on the geotextile

Geotextile filter fabric must be installed following the manufacturer's guidelines, ensuring that the seams between adjacent sheets are oriented perpendicular to the slope's base.

Before installing geotextile filter fabric in contact with rock fill, a protective layer must be applied according to the specified lines and levels in the Drawings The installation of geotextile filter fabric should not occur underwater Additionally, when the geotextile filter fabric meets granular filter material, a minimum overlap of 1 meter is required.

To ensure the integrity of geotextile filter fabric when in contact with rock fill, it must be safeguarded against punctures and abrasion by a protective layer made of naturally occurring, biodegradable materials Suitable options include woven bamboo sheeting, palm leaf roofing, or coconut matting, which must be approved by the Engineer This protective layer should be chemically inert and must not compromise the specified properties of the geotextile filter fabric.

Temporary dyke removal and Construction of Aggregate base

- After finish construction of filter layer, temporary dyke is removed by excavator

- Aggregate base is constructed by bulldozer and roller combination manual labor

Figure 38 Removal of cofferdam and construction of aggregate base

R.C Pavement and installing of accessory

- After finish construction of aggregate base, proceed R.C pavement and installing accessory as below figures:

HEALTH, SAFETY AND ENVIRONMENT ORGANIZATION

General Safety Procedures

The contractor is committed to adhering to all statutory regulations and safety procedures to safeguard shipping operations, public welfare, personnel, equipment, and materials This includes strict compliance with established rules for the correct mooring and anchoring of vessels.

When crossing between vessels, it is essential to employ safe procedures and practices, using only well-constructed and secure gangways Additionally, all open sides of floating pontoons and similar structures will be equipped with safety railings or barricades to mitigate the risk of falling overboard.

- All necessary navigational warning systems, marker buoys and other facilities will be correctly installed in accordance with the relevant regulations and will be properly maintained

- A safety plan (with a map of the ship) must be available on board and placed where the crew can easily see it

- The plan must also indicate the mustering point in case of emergencies

8.1.3 Inspection of life-saving and safety equipment

- The captain must regularly organize an inspection of all life-saving and safety equipment, according to the list contained in the safety plan, and take corrective action as appropriate

- During this inspection, the following equipment must be inspected daily, weekly and monthly

 Safety lamp, signal lamps, etc …

 All life rafts and lifeboats and the equipment mentioned on the inventory list; engines of motor lifeboats must be in good working order

 All lifebuoys and attachment, e.g flares and smock signal, etc…

 Navigation lights, signaling lights, etc…

- Every month the fire appliances, including breathing apparatus, have to be examined

- All inspection have to be recorded in the logbook

- All compressed air breathing equipment must be tested

- The breathing apparatus must be checked according to the manufacturer’s instruction

All navigational warning systems, marker buoys, and related facilities will be installed and maintained in compliance with relevant regulations Additionally, the movement of equipment and support barges will be closely monitored to prevent any interference or accidents during operations.

- All workers will be issued with protective clothing and safety equipment and properly made aware of its usage

To ensure safety and prevent drifting during operations, all floating vessels and barges must be securely moored Proper mooring should be conducted in designated areas to avoid interfering with other vessels in the vicinity.

- Before working, the contractor will install the floating buoy system for construction area as Plan of Marine Safety Assurance and warning buoy to prevent fishermen enter working area

To enhance workplace safety near water hazards, all areas where individuals may fall into the water will be equipped with guardrails Additionally, lifebuoys with long, buoyant ropes will be strategically placed at regular intervals along the water's edge to ensure quick access in case of emergencies.

- At the commencement of working shift the area will be checked to ensure that lifebuoys are in position and that the ropes are in satisfactory condition

To ensure safety, the platform must remain free of unnecessary materials, with clear passageways maintained at all times A rescue boat will be available if needed, equipped with spare life jackets, lifebuoys, ropes, and spotlights for nighttime operations.

 Emergency rescue drill should be conducted regularly to identify the issues which are to be improved

 In the event of an emergency, there should be persons on site or at work who are adequately trained and competent to follow the procedures set out below:

+ Periodic check of number of persons at work;

+ A set routine for raising the alarm (audible);

+ A set drill to provide rescue facilities; and + A set routine for directing emergency services and for getting injured persons to hospital

- Underwater working area must have warning signs and limit construction area

- All divers working in the water must be fully equipped with the required protection and must have a diving certificate and absolutely obey the site's safety rules

- Arranging people on guard and ensure safety while divers are working underwater Divers only work

VAN PHONG 1 BOT THERMAL POWER PLANT PROJECT in safe conditions, avoiding working in hazardous areas of cranes

+ Means of communication – in some circumstances “boat to shore radio” should be available

+ Spotlights fitted for hours of darkness or poor visibility underwater

Good housekeeping ensures a high standard of cleanliness and organization, creating a safe and healthy work environment Materials should be neatly stacked and easily accessible, while scrap, rubbish, and debris must be regularly cleared from the site Additionally, sufficient bins or skips should be available for the daily disposal of waste.

To ensure safety in the workplace, all areas, including passageways and stairways, must be well-lit and unobstructed at all times Any oil or substance spills that pose a hazard will be promptly addressed and cleaned to maintain a safe environment Additionally, work areas should remain organized and free from tripping hazards to promote overall safety.

The Contractor is committed to adhering to all applicable laws and regulations, as well as any specific fire safety requirements set by the Employer for the Project site To ensure fire safety, several preventive measures will be implemented to mitigate the risk of fire accidents on site.

To ensure a safe and clean environment, combustible waste and rubbish must not accumulate on the Project site or nearby areas Regular and timely disposal of waste will be implemented to maintain cleanliness and adhere to safety standards.

Welding and cutting activities are strictly prohibited in areas where combustible materials are present or where there is a risk of explosive or flammable dust, gases, or vapors being released.

Fire extinguishers will be strategically placed in visible locations and adequately maintained, with inspections conducted every six months by a certified servicing company Access to these firefighting tools will remain unobstructed by vehicles, equipment, or materials to ensure safety at all times.

- At each working area, arrange fire precautions, fire prevention procedure and equipment for firefighting (at least fire extinguisher)

8.1.9 Site Situation Response and Emergency Response

Before starting the Work, the Subcontractor must assess and report on the condition of existing houses, waste materials, farms, and any ongoing cultivation activities to both the Contractor and relevant local authorities.

The VP1 initiative aims for zero incidents and accidents, prioritizing the safety and well-being of individuals In the event of any incident, it must be promptly reported to the EHS officer and manager While it is acknowledged that incidents may occur, management will thoroughly investigate each occurrence and provide a detailed report The ultimate goal remains clear: to achieve zero harm to people and to prevent future incidents.

- Reporting line : Incident / accident  EHS officer and manager  Site manager  Owner

For minor accidents occurring in the field, a medical kit is available in the container field office However, for injuries that exceed normal severity, individuals are transported to the appropriate hospital based on the severity of the accident.

+ Khanh Hoa General Hospital, tel: 0258 3822 175

+ Ninh Hoa Town Hospital, tel: 0258 3845 038

+ Ninh Hoa Medical Center, tel: 0258 3844 373

Safety Practice Rules

All work, equipment and plants shall be in accordance with Vietnam’s environmental, safety, transportation and labor legislation and standards, and shall satisfy all contractual obligations

Provides internal inspection checklists for tools and equipment (daily, weekly and monthly)

Provide oil spill prevention plan, list of equipment and tools to prevent oil spills separately for review and approval

All marine plant and equipment shall be inspected and certificated as required under the regulations before being placed in service

Third party inspection must be performed for all equipment has strict safety requirements (Vietnamese law) Must be listed in detail the equipment will be used

Minimum qualification of the master, pilot, and crew of marine plant shall be possession of a current valid license or certification

Prior to the deployment of any marine plant and equipment, a qualified individual must conduct thorough inspections and tests to ensure that all machinery is in safe operating condition.

Marine plant and equipment found in an unsafe condition shall be taken out of service and its use prohibited until unsafe conditions have been corrected

In the event that floating plants are at risk from hurricanes, storms, or other threats, it is essential to promptly relocate them to a safe harbor or secure location.

Provisions shall be made to prevent accumulation of fuel and grease on floors, decks, and in bilges

A shutoff valve must be installed at the fuel tank connection, with provisions for its operation from outside both the tank compartment and the engine compartment Fuel oil transfers for floating plants must comply with regulations, including those governing fuel coupling devices and fuel oil discharge containment Additionally, venting fuel tanks is essential when utilizing these couplings.

Storage tanks to contain the tank contents in the event of leakage

Deck loads will be secured and loading limited to safe capacity Holdbacks or rings will be provided to secure loose equipment aboard during rough weather

All employees will receive the necessary personal protective equipment (PPE) tailored to their specific job tasks, along with comprehensive training on its proper use Each employee is responsible for the maintenance and appropriate use of the PPE provided Contractors will ensure that any PPE that becomes worn or deficient due to normal usage is replaced, ensuring that workers always have adequate protection Normal wear and tear will be considered within the manufacturer's specified effective use period and basic hygiene standards.

Supervisors at any work site must ensure that all personnel are properly trained in the use of personal protective equipment (PPE) and that they are supplied with and wearing the necessary gear for their specific tasks and environment Employees who are not equipped with the required PPE for any reason will be prohibited from starting or continuing their work.

The following protective measures should be provided and taken by those persons working near to, on or over water:

- All persons should have been inoculated against Tetanus and Poliomyelitis during the preceding 5 years;

- Good welfare and hygiene facilities, in which persons can wash hands, face and forearms after every work period;

- All persons shall wear a correctly fitted life jacket;

- During work periods in hours of darkness or poor visibility, life jackets should be fitted with clip on self-igniting lights;

- Persons should always, where possible, work in pairs so there is someone to raise the alarm;

- Helmets should be worn if danger of injury to the head exists;

- Retro-reflective jackets or vests to be worn if cranes or vehicles are in use;

- Protective footwear with non-slip soles should be worn – rubber wellingtons and thigh boots once filled with water act as deadweight and therefore should not be worn; and

- There should be adequate first aid facilities with a trained first aider at all times

This safety guidance offers a general overview of potential hazards associated with the planning and execution of contiguous pile wall operations While the list provided is not site-specific, it serves as a foundational reference for identifying risks in such projects.

The purpose of this list is to provide the personnel associated with this activities, information and guidance, to ensure that:

- Works are carries out in a safe manner at all times

- The hazard associated with the activity are understood

- The control in force to avoid exposure to injury, ill health and damage/ accidents/ incidents are implemented and maintain

Job Safety Analysis is as table below:

List of all job steps Job description Hazardous Precautionary measures

1 Excavation work - Excavator excavate soil

- Excavator hit people - Must have the signalman

- Driver must observe around before rotate the excavator

- Excavator overturn - Choice safety location to put survey machine Can stop working to move excavator to safety location

- Material excavation falling hit people, and equipment, people fall down to excavation pit

- Safety officer check all the working time of excavator

2 Transport and unloading rock at side

- Mobilize truck and excavator to unloading rock location

- Truck hit people, things, overturned

- Control the loading capacity of truck check safety equipment support for truck before use

- Survey the road, speed limit, must have the signalman

- Dumping rock - Rock hit people - Workers should be fully equipped with labor protection before work, when dumped vehicles need to keep a safe distance to avoid kicking people

- Transport by barge - Rock fall down water

- Barge should have safety balcony for material and people

- There are lifebuoy on barge

3 Rock work at site - Dumping rock to site by truck

- Rock hit people Same above

- Dumping rock by crawler crane

- Rock fall down to people, equipment

- Install warning danger area, worker don’t stand under loading of crane

- Control the loading capacity of crane

- Hand scratch - Use safety glove

- Diver make levelling under water

- Fully equip of labor protection, always supervising while working

4 Concrete work - Installation of reinforcement

- Sharp steel stabbed into people

- Accident caused by steel cutting and bending machine

- Use safety glove while working

- Formwork hit people while use crane to lift and install formwork

- Check the status of crane

- Worker only touch to formwork when crane lower formwork to safety elevation

- Electric shook, burned, fire, explode, Sore eyes, inhale harmful gas

- Check the earthling of equipment, prepare all safety tool as solder mask, safety glove

5 Pouring concrete - Transport concrete to the site by concrete truck

- Check the loading capacity of trailer, must to signalman

- Pumping concrete - Brocken pipe - Check the pipe before use, wear the mask

6 Transport precast concrete unit to site

- Mobilization of lorry and crane for transportation

- Trailer and crane hit people, things, sink, capsize

- Control the loading capacity of trailer, check chain before use

- Thread cable through the precast concrete unit and fixing by sheck

- Hand clip - Minimize to slip hand into or underneath precast concrete unit, use stick for control cable to tie precast concrete unit

- User crane for lifting precast concrete unit out of trailer and put in on the lorry

- Precast concrete unit falling down, capsize of crane and trailer

- Out of control of precast concrete unit (spin the air hit peoples or things)

- Check the status of crane

- Safety officer check all the working time of crane(rise up of boom, lifting capacity of crane)

- Check status of lorry’s tire before working

7 Installation of precast concrete unit

- Use crane for lifting precast concrete unit to installation location

- Same with lifting precast concrete unit of transportation

- Transport soil to out site

- To slip foot, mud, soil hip people

- Fully equip of labor protection, cove the working area

- Spill oil or fuel - Equipment broken

- Don't have method to anti-spill when repair equipment

- Check and repair all fuel pipe, if can't repair, it must be change

- Use funnel in supplies fuel

- Must have 2 person for supplies or extract fuel

- Below fuel can, use tray to collect fuel

- When supplies fuel to equipment, keep a gap 10~15cm inside can to avoid spill

- Spill fuel when transposition (fall down fuel can, transport equipment have accident)

- Use plastic bag to cover fuel can

- In repair period, spread PVC sheet and tray to collect fuel

- Marking fuel can by paint

- All disposal fuel must put in correct location

- Stop the job if the weather change

Maritime Safety Assurance

At the construction site, lozenge floats will be strategically positioned to ensure safe navigation These buoys are maneuvered to prevent any obstruction to traffic and to keep cables clear of navigable channels In low visibility conditions, the buoys will be equipped with signal lights to alert nearby vessels When construction equipment departs from the mooring area, the entire float system must be relocated to maintain traffic flow.

During construction, anchoring of construction vessels is permitted only within designated areas marked by signal buoys, secured by tow and steer anchors, to ensure navigation remains unobstructed in the channel and water area adjacent to the berth It is essential to proactively communicate and provide guidance to vessels navigating through the construction zone.

In the event of local rainstorms and storms, the site management board will swiftly instruct crew members to secure and reinforce construction equipment, ensuring effective measures are in place to minimize the risk of marine accidents.

- The contractor will arrange 02 buoys to signal the construction area with detail position as in the figure below:

Figure 42 Layout of buoy to signal the construction area

8.3.2 Garthering of construction equipment when suspended

- In bad weather conditions, abnormal weather, thunderstorms, blizzard the construction equipment will stop working, moving to safe anchorage position as shown in Plan of Marine Safety Assurance

- When there is storm news, the Contractor to build and send to Nha Trang port authorities the plans to prevent storms for construction equipment and means as required

Instruction from Port Authority on VHF :

8.3.4 Studying, training, inspection and supervision of traffic safety

- Organizing, guiding and training of all staffs and construction workers at the construction site on waterway safety assurance and other safety contents

- Safety staff must regularly monitor, supervise and checking the activities of construction teams during construction progress to timely maintain and prevent the phenomenon of unsafe occur

- Updating and monitoring regularly the progress of work safety in the process of construction into the record of safety work

- All training for marine work is under DHI safety trainer who has enough relevant certificate relation to marine works

Nha Trang Port Authority Representative

Contractor’s Equipment Khanh Hoa Port

SCHEDULE FOR SHORE PROTECTION AND UNLOADING RAMP

Construction Progress S-Curve for Shore Protection Work

Month On-shore Off (Mar-Oct) Off (Nov-Feb) Start Finish Duration Week W 1 W 2 W 3 W 4 W 5 W 6 W 7 W 8 W 9 W 10 W 11 W 12 W 13 W 14 W 15 W 16 W 17 W 18 W 19 W 20 W 21 W 22 W 23 W 24 W 25 W 26 W 27 W 28 W 29 W 30 W 31 W 32 W 33 W 34 W 35 W 36 W 37 W 38 W 39 W 40 W 41 W 42 W 43 W 44 W 45 W 46 W 47 W 48 W 49 W 50 W 51 W 52 W 53 W 54 W 55 W 56 W 57 W 58 W 59 W 60 W 61 W 62 W 63 W 64 W 65 W 66 W 67 W 68 W 69 W 70 W 71 W 72 W 73 W 74

S1L4C0015 Stone Work for Shore Protection Plan

Core rock (1-300kg) m3 10,488 25day/m 10-Feb-20 03-Mar-20 24 Plan ### ### ### ### ###

Filter stone & mat (1-30kg) m2 1,235 25day/m 05-Mar-20 11-Mar-20 6 Plan ###

Underlayer placing (200-400kg) m3 2,371 20day/m 15day/m 25-Apr-20 03-May-20 9 Plan ### ###

Underlayer leveling(200-400kg) m2 2,371 20day/m 15day/m 05-May-20 12-May-20 7 Plan ### ###

Core rock (1-300kg) m3 24,384 25day/m 14-Mar-20 18-Apr-20 36 Plan ### ### ### ### ### ### ###

Filter stone & mat (1-30kg) m2 2,565 25day/m 21-Mar-20 25-Apr-20 36 Plan ### ### ### ### ### ###

Underlayer placing (200-400kg) m3 3,166 20day/m 15day/m 20-Apr-20 30-Apr-20 11 Plan ### ###

Underlayer leveling(200-400kg) m2 3,166 20day/m 15day/m 02-May-20 12-May-20 10 Plan ### ###

Core rock (1-300kg) m3 20,463 25day/m 17-Feb-20 22-Apr-20 66 Plan ### ### ### ### ### ### ### ### ### ### ###

Filter stone & mat (1-30kg) m2 3,128 25day/m 24-Apr-20 08-May-20 15 Plan ### ### ###

Underlayer placing (200-400kg) m3 3,085 20day/m 15day/m 10-May-20 20-May-20 11 Plan ### ###

Underlayer leveling(200-400kg) m2 3,085 20day/m 15day/m 22-May-20 01-Jun-20 10 Plan ### ###

Underlayer placing (400-600kg) m3 1,606 20day/m 15day/m 03-Jun-20 08-Jun-20 6 Plan ###

Underlayer leveling(400-600kg) m2 1,235 20day/m 15day/m 10-Jun-20 15-Jun-20 6 Plan ###

Core rock (1-300kg) m3 93,918 20day/m 15day/m 02-Mar-20 22-Jun-20 114 Plan ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ###

Filter stone & mat (1-30kg) m2 8,841 20day/m 15day/m 19-Mar-20 25-Jul-20 129 Plan ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ###

Underlayer placing (400-800kg) m3 10,715 20day/m 15day/m 04-Aug-20 08-Sep-20 36 Plan ### ### ### ### ###

Underlayer laveling(400-800kg) m2 8,242 20day/m 15day/m 10-Sep-20 12-Oct-20 33 Plan ### ### ### ### ###

Actual Precast of Rakuna Blocks (4ton) EA 2,306 11EA/day 25day/m 13-Apr-20 08-Feb-21 303 Plan ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ###

Precast of Rakuna Blocks (8ton) EA 5,139 29EA/day 25day/m 13-May-20 23-Jan-21 256 Plan ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ###

Precast of Stone Blocks (3ton) EA 1,647 7EA/day 20day/m 15day/m 13-Apr-20 31-Mar-21 354 Plan ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ###

Installation of Rakuna Blocks EA 7,445 20day/m 15day/m 12-Jun-20 16-Mar-21 279 Plan ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ###

Installation of Stone Blocks (3ton) EA 1,647 20day/m 15day/m 12-Jun-20 15-May-21 339 Plan ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ###

Bottom concrete of RC Wall m3 1,619 25day/m 01-Oct-20 22-May-21 234 Plan ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ###

Wall concrete of RC Wall m3 1,619 25day/m 31-Oct-20 21-Jun-21 234 Plan ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ###

Slope excavation & compaction m 538 25day/m 01-May-20 30-Sep-20 154 Plan

Geotextile m2 11,370 25day/m 08-May-20 05-Oct-20 152 Plan ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ###

Macadam (4x6cm) m3 2,241 25day/m 10-May-20 10-Oct-20 155 Plan ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ###

Riprap (Dn50) m3 6,412 50m3/day 25day/m 17-May-20 17-Oct-20 155 Plan ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ###

Concrete L Block m3 384 25day/m 17-May-20 17-Oct-20 155 Plan ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ###

Slope excavation & compaction m 841 25day/m 07-Oct-20 30-Jan-21 115 Plan

Geotextile m2 17,657 25day/m 14-Oct-20 04-Feb-21 113 Plan ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ###

Macadam (4x6cm) m3 3,108 25day/m 16-Oct-20 23-Feb-21 130 Plan ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ###

Riprap (Dn50) m3 9,618 50m3/day 25day/m 23-Oct-20 02-Mar-21 130 Plan ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ###

Concrete L Block m3 600 25day/m 23-Oct-20 02-Mar-21 130 Plan ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ###

50EA/day x 1.team 50EA/day x 0.5team

1,000m3/day x 1.5team 300m2/day 1,400m3/day 400m2/day

November-20 December-20 January-21 February-21 March-21 April-21

May-20 June-20 July-20 August-20 September-20 October-20

Working Date Current Feb-20 Mar-20 April-20

Activity ID Activity name Unit Quantity Productivity

Construction Progress S-Curve for Temporary Unloading Ramp

Month Start Finish Duration Week W 23 W 24 W 25 W 26 W 27 W 28 W 29 W 30 W 31 W 32 W 33 W 34 W 35 W 36 W 37 W 38 W 39 W 40 W 41 W 42 W 43 W 44 W 45 W 46 W 47 W 48 W 49 W 50 W 51 W 52

Temporary coffadam MD 160.0 15-Feb-20 03-Mar-20 18 Plan 0.70 0.70 0.16

Construction Rubble at bottom M3 837.5 20-Apr-20 30-Apr-20 10 Plan 1.18 1.18

Construction Armor Stone M3 188.4 23-Apr-20 28-Apr-20 6 Plan 0.24 0.36

Fabrication of concrete block m3 3,353.0 08-Apr-20 12-Jun-20 65 Plan 3.59 3.59 3.59 3.59 3.59 3.59 3.59 3.59 3.59 0.33

Installation of concrete block nos 392.0 01-May-20 16-Jun-20 47 Plan 0.39 0.39 0.39 0.39 0.39 0.39

Construction Rubble stone M3 4,117.2 19-May-20 27-Jun-20 40 Plan 1.93 1.93 1.93 1.93 1.93 1.93

Construction Filter stone M3 429.5 15-Jun-20 01-Jul-20 17 Plan 0.60 0.60

Install Geotextile M2 330.0 02-Jul-20 06-Jul-20 5 Plan 0.08

Install rebar Ton 16.5 17-Jun-20 21-Jul-20 35 Plan 0.24 0.24 0.24 0.24 0.24 0.24

Install formwork M2 283.8 17-Jun-20 21-Jul-20 35 Plan 0.07 0.07 0.07 0.07 0.07 0.07

Casting concrete M3 414.5 04-Jul-20 22-Jul-20 19 Plan 1.19 1.43 1.43 0.72

Install Geotextile M2 684.0 02-Jul-20 06-Jul-20 5 Plan 0.17

Aggregate base M3 148.2 08-Jul-20 13-Jul-20 6 Plan 0.21 0.14

Install rebar Ton 30.9 15-Jul-20 20-Jul-20 6 Plan 2.66

Install formwork M2 102.5 16-Jul-20 22-Jul-20 7 Plan 0.16

Casting concrete M3 207.5 23-Jul-20 23-Jul-20 1 Plan 2.39

Ripzap Dn50 M3 388.8 07-May-20 22-Jun-20 47 Plan 0.20 0.20 0.20 0.20 0.20 0.11

Bollard 25T nos 10.0 16-Jul-20 22-Jul-20 7 Plan 0.31 0.31

Fender SV-400H nos 13.0 23-Jul-20 08-Aug-20 17 Plan 0.23 0.28 0.28

February-20 March-20 April-20 May-20 June-20

Activity ID Activity name Unit Quantity

SPECIFICATION FOR RAKUNA-IV

A new type of wave dissipating block with 4 hollows on the surface

NIKKEN KOGAKU CO.,LTD. http://nikken.kogaku.co.jp

It was demonstrated by Joint Reserch with Water Resources University and Nikken Kogaku Co.,Ltd (2011) where H s Significant wave height r s Mass density of concrete r w Mass density of water

This coefficient is valid for 1:1.5 slope.

RAKUNA ・Ⅳ is NETIS registration technology

NETIS:New Technology Information System of

MLIT (Ministry of Land, Infrastructure, Transport and Tourism) in Japan

It was demonstrated by Joint Reserch with Kyoto University and Nikken Kogaku Co.,Ltd (2007)

N s has a value for each deepwater wave steepness S 0

These coefficients are valid for 1:1.5 slope.

K D value for Hudson's formula trunk sections K D K D K D breakwater heads K D K D K D note:

Two layer systems can utilize identical values, demonstrating equal stability compared to full face forms This was validated through hydraulic experiments conducted with irregular wave conditions.

The filleting is attached to more than 40t type. c b 2a

Metal form area (m 2 ) Actual weight (t)

The standard of the block slope is 1:1.3 - 1:2.0.

Required block number N is calculated by the next formula.

V × （ 1 ― α ） N ： required block number ν ： concrete volume of one block（m 3 ）

Ｖ： Total construction volume of RAKUNA・Ⅳ（m 3 ） α ： void ratio（56.5％） unit：m

●Calcuration of required block number

※The above table is a standard size We can do this other designs, please feel free to consult with us. unit：m

The standard of the block slope is 1:1.3 - 1:2.0.

Required block number N is calculated by the next formula.

V × （ 1 ― α ） N ： required block number ν ： concrete volume of one block（m 3 ）

Ｖ： Total construction volume of RAKUNA・Ⅳ（m 3 ） α ： void ratio（56.5％） unit：m

● Calcuration of required block number

※The above table is a standard size We can do this other designs, please feel free to consult. unit：m

Crown width : B' 3-levee crown rows

4-levee crown rows 5-levee crown rows

The side form is set up in the bottom form, and installing the cap of leg.

Casting concrete Multiplying the vibrator carefully so that the bubble should not occur.

Compacting enough with the vibrator, and the levee crown is finished up.

After the formwork is cleaned enough with the keren stick, and apply the release agent

Assembling the bottom form, side forms and side form's top.

The special mount is prepared more than 40t type For 6t-32t type, subsidence prevention components make up 1 set.

1) each plates assembling 2) release agent (oil) spraying 3) bottom plate installation

4) side plates installation 5) concerte casting 6) spacing and leveling

※Please see the construction manual about the security precautions of details and the high-place work, etc.

※The time of the stripping depends on the strength of stripping examination book.

After casting concrete, it covers with sheet etc and curing is done until the required strength is filled.

Stripping of the side form More curing, stripping of the bottom form after required strength is filled.

7) curing 8) demolding side plates 9) demolding bottom plate and lifting to stock yard

S 2 ＝L+1 （for one row） n 1 ：the number of block rows of the concrete casting yard n 2 ：the number of block rows of the transposition yard a a a a L

Please secure an enough area for the fabrication yard to work safe and efficiently

A required area of the fabrication yard is different depending on the field conditions of the block size, the production volume and the amount of the metal form, etc

This calculation method is general yard arrangement Please consider the heavy equipment road and the haul road additionally.

Please level the yard so as not to cause the warp of the metal form.

・Temporary storage yard (stock yard) temporary storage yard area(m 2 ) = occupation area per one block *K

Required area of the concrete casting, transposition and temporary storage yard (reference)

※This table assuming 100 blocks fabrication and 10 metal forms.

Echizen fishing port in Fukui Pref 64t

Occupied area per block ： (m 2 /piece)

Casting yard (for a row composed of 10 blocks)

Transposition yard (for a row composed of 10 blocks) L2(m) S2(m)

RAKUNA・Ⅳ was developed in 2007 Before now, It was been used more than 300,000t.

64t, Wave absorbing breakwater, Fuji Coast, Shizuoka Prefecture

25t, Foot protection works, Sarahama fishing port, Okinawa Prefecture

50t, Wave absorbing breakwater, Fuji Coast, Shizuoka Prefecture

RAKUNA・Ⅳhas been also active in the recovery from the 2011 Tohoku Earthquake Tsunami Disaster 20t, Wave absorbing breakwater,

17F Nittochi-Nishishinjuku bldg 6-10-1 Nishishinjuku, Shinjuku-ku, Tokyo 160-0023, Japan

+81-3-3344-6811 +81-3-5381-7377 contact@nikken-kogaku.co.jp

+81-3-6361-0028 +81-3-3344-6817 contact@nikken-kogaku.co.jp

19F LADECO Build, No.266 Doi Can Str, Lieu Giai Ward, Ba Dinh Dist, Hanoi Vietnam

+84(0)4-37621682 +84(0)4-37621684 contact@nikken-kogaku.co.jp

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RISK ASSESSMENT

Project : Van Phong 1 Thermal Power Plant

People Cause of at Risk Adverse Effect

- No control of vehicles access/egress to site

- No control of plant and equipment

- Unauthorised vehicles and pedestrians passing through site entrances

- Lack of suitable access/egress from the project location

- Lack of awareness and suitable control measures implemented

- No control of delivery vehicles (& drivers) travelling to, from or around site

- Collision with vehicles and pedestrians

- Traffic management plan and site layout shall be produced

- All suitable access/egress locations, signage, pedestrian walkways and routes will be highlighted on the traffic management plan and site layout plan

- Suitable speed limits will be enforced

- Adequate warning signage will be erected on all routes

- Good visibility allowed for vehicles entering/exiting site and the public passing-by

- Entrance well maintained; kept clean, level and trip free

- Security gate; only authorized persons to enter site with the relevant ID card and site pass for vehicle.

Both documents shall be given to personnel who have undertaken an EHS induction training

- Soil contamination from vehicle/plant & equipment

- Effect on adjacent buildings and residents

- Effect on local road conditions

- Effect on public health due to dust and noise

- Ground contamination due to oil spillage or leakage from plant /equipment & vehicles

- Control of dust through regular water spray on roads

- Noise monitoring for plant & equipment, restricting the high noise equipment entering to site

- Inspection of all plant/equipment and vehicles before entering to site to check for any possible oil spill or leakage

- Sheet all vehicles carrying bulk materials into and out of the site to prevent dust dispersal during transit Including transport of bulk materials inside the site.

- Regularly spray water on stripped topsoil to minimize dispersion on dust

- Secondary containment system will have a capacity of not less than 110% of the container’s storage capacity

- Collision with vehicles and pedestrians due to lack of knowledge and awareness of traffic routes

- Not wearing the appropriate PPE when on site

- Overturning of vehicle when unloading

- Traffic management plan and site layout shall be produced and displayed at site entrance

- All suitable access/egress locations, signage, pedestrian walkways and routes will be highlighted on the traffic management plan and site layout plan

- All delivery drivers to receive brief induction & direction from gate attendant

- Delivery vehicles to be escorted by trained banksman at all times

- All delivery drivers to wear min PPE inclusive of safety helmet, safety shoes, safety glasses and high-visibility vest

- Traffic controllers assigned on intersections and congested areas

- Only certified and qualified riggers will load / unload materials during lifting operations

All delivery vehicles (& drivers) travelling to, from or around site/

Control measures will be regularly reviewed and monitored to assess their suitability and improvements made if required.

Any modifications to the working conditions or operations, such as alterations in sequencing, the introduction of new equipment, or the involvement of new personnel, will prompt a new risk assessment This assessment will lead to the implementation of additional control measures tailored to the specific operation.

Any modifications to working conditions or operations, such as changes in sequencing, the introduction of new equipment, or the involvement of new personnel, will trigger a new risk assessment This assessment will lead to the implementation of additional control measures tailored to the specific operation.

Job / Task Adverse Effect L 1 S 1 RFN ** Control Measures L 2

People Cause of at Risk Adverse Effect S 2 RRN * Assessment

- Dust emissions into the air

- Soil contamination from vehicle/plant and equipment

- Effect on public health due to noise and dust

- Ground contamination due to oil spillage or leakage from plant /equipment & vehicles

- Traffic congestion on public roads

- Managing traffic of the project considering the rush hours on public roads

- Control of dust through regular water spray on roads

- Inspection of plant and vehicles before entering to the site

- Sheet all vehicles carrying bulk materials into and out of the site to prevent dust dispersal during transit Including transport of bulk materials inside the site

- Overturning and overloading of vehicles

- Lack of signage and speed limits

- Lack of barriers along roadways

- Lack of training and awareness

- Lack of designated parking areas

- Traffic management plan; informed during training and displayed on site entrance

- Suitable and sufficient traffic routes (vehicle and pedestrian segregation)

- Security on main access routes; control access/egress and only authorized persons to enter

- All reversing of vehicles control by a banksman

- Road signage displayed showing access routes and speed limits

- Roads of adequate width to allow traffic to move safely

- Adequate lighting provided on all access roads

- Heavy equipment designated flagman during travel

- Designated bus parking areas established

- Traffic controllers assigned on intersections, congested areas and designated parking area of buses

- Traffic accident due to congestion

- Effect on public health due to dust emission

- Effect on public health due to generation of noise

- Managing traffic of the project considering the rush hours on public roads

- Control dust through regular water spray on roads

- Control noise by inspection of vehicle/equipment/plants

Any modifications to working conditions or operations, such as changes in sequencing, the introduction of new equipment, or the involvement of new personnel, will prompt a fresh risk assessment This assessment will lead to the implementation of additional control measures tailored to the specific operation.

- Struck by moving, falling or flying objects

- Falls from working at height

- Installation of designated pedestrian walkways to segregate from vehicles and work operations

- Good housekeeping, keeping access/egress routes clear of obstructions and trips/slips/falls hazards

- Regular housekeeping inspections shall be undertaken

- Suitable netting shall be installed over walkways and waste materials transferred from height to ground via waste chutes

- Stairways shall be of adequate width and depth with handrails installed either side

- Segregation of vehicle routes, unloading/loading areas material storage areas shall be installed on site

- All vehicle reversing shall be controlled by a banksman and audible devices

- Site layout and traffic management shall be included in training and displayed on notice boards/welfare areas

- Adequate lighting shall be installed on all walkways

- Signage shall be used on all roads with pedestrian crossing points

- PPE to be worn at all times

- Canopy provided on all access way to buildings with net and signages for easy identification

- Over speeding of vehicles in public areas

- Information to community regarding heavy traffic movement

- Random checking by security of vehicle speed using speed gun

- Installation of additional speed limit and stop signage on roads

Any modifications to working conditions or operations, such as changes in sequencing, the introduction of new plant or equipment, or the involvement of new workers, will necessitate a new risk assessment This assessment will ensure that appropriate control measures are implemented to align with the updated operations.

- Ignition of flammable gases and combustible materials

- Faulty cables, extension leads, plugs and sockets

- Appointment of temporary electrical manager to prepare temporary electrics plan

- RCD or ELCB rated at 30mA (miliamp) to be installed and tested before use Boards must be earthed

- Only appointed persons to have entry

- Distribution board must remain locked at all times

- Sufficient transformers and socket outlets installed to prevent overload

- Leads carefully laid out and suspended away from congested areas to reduce likelihood of damage

- Maintenance undertaken by competent person

- Only qualified and certified (3rd Party) electrician allowed to terminate panel boards

- All distribution panel boards heve warning signs, checklist and contact person attached on the front door

- Unauthorized access of public to electrical network due to lack of awareness and lack of control

- Fatality or serious personal injury

- Lock Out Tag Out system implemented

- All temporary electrical netwroks shall be inaccessable for pubulic

- Only authorized personnel with valid Permit to Work allowed to access the electrical networks

- All distribution panel boards are locked and only authorized person can open the panel boards

- Hard barricade installed on the panel boards with warning signs

Use of plant and equipment

Tools) - Excavators,Dozer, Tug boat, Barge

- Plant register containing all plant and equipment on site as well as relevant documentation i.e test certificates, examination reports, inspection/maintenance reports, operator competency certificates, etc.

- Regular inspections and maintenance undertaken on all equipment by competent persons

- All defective items reported immediately, if defect renders equipment unsafe to use it will be removed from site until repaired

- Segregation of areas when plant being used

- Banksman used for all plant movements

- PPE must be worn at all times

- Traffic management plan adhered to when moving around site

- Seat belts worn, and audible devices used when moving plant

- Mandatory all operators and drivers to attend defensive driving safety training

Any modifications to working conditions or operations, such as changes in sequencing, the introduction of new plant or equipment, or the involvement of new workers, will necessitate a new risk assessment and the implementation of additional control measures tailored to the operation Given that the Risk Rating Number (RRN) exceeds 6 for this activity, a Job Safety and Environmental Analysis (JSEA) will be required.

Any modifications to working conditions or operations, such as changes in sequencing, introduction of new equipment, or involvement of new personnel, will necessitate a new risk assessment and the implementation of additional control measures tailored to the operation Given that the Risk Rating Number (RRN) exceeds 6 for this activity, a Job Safety and Environmental Analysis (JSEA) will be performed.

Use of plant and equipment

Tools) - Excavators,Dozer, Tug boat, Barge

- Generation of noise and vibration

- Effect on people health due to excessive noise

- Effect on people health due to dust emission into air

- Environment pollution due to fire or explosion

- Control of noise through inspection of all equipment, tools and plants before entering to the site

- Control of dust emission through regular water spray on roads

- Fire prevention plan implementation proactively

- Fire extinguisher in place on all equipments

- Use of ear plug when exposed near noise area (above 85 dB)

- Proximity of stored materials, waste materials or plant falling into excavation

- Supervision of work by competent person

- Adequate shoring (sloping 34 degree angle / benching) and battering of excavation to prevent collapse

- Edge protection installed around excavation

- All materials stored at least 2m away from excavation edge

- Air monitoring inside excavation to ensure no hazardous fumes present

- Influx of sea water controlled by the use of pumps

- For vehicles tipping materials into excavation, stop blocks should be used at all times, banksman should be available

- All vehicle movements controlled by a banksman

- Proper access to be provided with steps and railings

- Heavy equipment must be minimum 5 meters away from the edge of excavation

- Hard barricade with signages installed around the excavation

- Doosan electrical representative to check actual location of excavation prior to approval of PTW

- Good quality of as-built drawing with detailed underground facilities attached to the PTW

- Copy of approved PTW with drawing MUST be with the excavating crew at all time

- Effect of people health due to excessibe noise of equipment

- Public encountered with open excavations could cause serious injuries

- Control of dust emissions through regular water spray

- Restricting high noise equipments entering to site

- Inspection of all equipments before entering to site

- Provision of hard barricades and clear warning signs

- Provision of warning lights during night time for excavations nearby public roads and residential areas

Any alteration to working conditions or operations, such as changes in sequencing, the introduction of new equipment, or the involvement of new workers, will trigger a new risk assessment This assessment will lead to the implementation of additional control measures tailored to the specific operational changes.

- Life provisions located within the area

- Work undertaken and supervised by competent persons

- Development of emergency rescue procedures

- Emergency safety boat provided with trained operator

- Inspections of all equipment before entering to site to ensure no oil leakage or spill

- Emergency oil spill kits and oil barriers shall be available at location

- Oil screens shall be installed on all discharge points of storm water channel

- Safe working area provided with the following hierarchy of fall protection in place:

To ensure safety on construction sites, it is essential to provide properly constructed working platforms equipped with toe boards and guardrails, which must be erected, inspected, and approved by qualified personnel When feasible, collective fall protection measures such as guardrails, nets, or bags should be implemented and regularly inspected by competent individuals In situations where collective protection is not practical, individual fall protection systems, including harnesses, lanyards, or inertia reels, must be utilized Ladders and step ladders should only be considered as a last resort when none of the aforementioned safety measures are applicable.

- Only competent people authorized to working at height

- Only competent authorized persons allowed to erect any working at height equipment

- Regular inspections of working at height equipment to be undertaken by competent persons

- Segregation of area below using signage and barriers warning of restricted access

- Practice 100% tie-off when working at height

- Installation of canopy specially on the access way

- Exposure of general public to the work areas

- Control of dust emissions through regular water sprays

- Control of noise through strict inspection of all equipment before entering to site and provision of acoustic barriers where noise exceeds the allowable limits

- Establishing fence and security system to restrict the unauthorized entry to work site

Any modifications to working conditions or operations, such as changes in sequencing, the introduction of new equipment, or the involvement of new personnel, will necessitate a new risk assessment and the implementation of appropriate control measures Given that the Risk Rating Number (RRN) exceeds 6 for this activity, a Job Safety and Environmental Analysis (JSEA) will also be performed.

Control measures will undergo regular reviews and monitoring to ensure their effectiveness, with improvements made as necessary Any alterations to working conditions or operations—such as changes in sequencing, the introduction of new equipment, or the involvement of new personnel—will trigger a new risk assessment, followed by the implementation of additional control measures tailored to the updated operations.

In addition to control measures stated above for general work areas located at height the following will be implemented:

1 - All working at height equipment shall be constructed, maintained and dismantled by competent people

2 - Exclusion zones set up during erection, dismantling and use

4 - All support systems to be included in a temporary works register

5 - Documentation in the form of inspections, registers, certification and technical data to be kept on file

- Barricade in place with signage during erection / dismantling of scaffold platforms

- No throwing of scaffold materials during dismantling

- Installation of planks on the scaffold ladder with barricade on scaffold platforms that are Red Tag

- Emission into air during transportation

- Effect on people health due to emissions from transport equipment

- Soil contamination due to any oil spill or leakage for plant/ equipment and vehicles

- Inspection of all vehicles, plant/equipment before entering to site

- Control of dust emissions through regular water sprays on access roads

- Use of ear plug when exposed near noise area (above 85 dB)

- Secondary containment system will have a capacity of not less than 110% of the container’s storage capacity

- All users trained before use

- Pre checks made to make sure PPE is fitted correctly

- Monthly inspections undertaken to establish that all operatives are wearing PPE correctly

- PPE registers to be kept

- Practice 100% tie-off when working at height

- Safety harness must be installed properly not exposed to sunlight or rain

- Uncontrolled access to elevated working platforms

- Exposure of unauthorized people to elevated working platforms

- Restrict unauthorized entry to work site

- Use of Scaffold Tag System for temporary platforms red tag means do not use

- Falling of materials and objects

- Clear and safe access and egress

- Effective material storage in segregated areas

- Regular monitoring of work areas

- Unwanted materials remove from site immediately

Use of fall protection PPE

If any change is made to the working condition or operation i e change in

Errection, dismantling and use of temporary works/support systems at height - scaffolds, slip form

Any modifications to working conditions or operations, such as changes in sequencing, the introduction of new equipment, or the involvement of new workers, will necessitate a new risk assessment and the implementation of appropriate control measures Given that the Risk Rating Number (RRN) exceeds 6 for this activity, a Job Safety and Environmental Analysis (JSEA) will also be performed.

- Social conflicts in shape of community complaints

- Effective waste management (waste bins provided around site and skips segregated, with waste disposed of by an approved licensed contractor)

- Monitoring of waste collection contractor and ensuring the dumping in licensed area

- Materials only stored in designated areas

- Materials to be stored according to manufacturers guidance and specifications

- Packaging checked prior to stacking – no loose straps/bands

- Materials shall not be stacked to high and laid on stable ground

- Material storage locations shall be segregated with adequate signage displayed

- Material storage shall be regular inspected to ensure stability and material condition

- Combustible materials shall be stored free from sources of ignition in a segregated compound with adequate signage and fire provisions

- Proper access provided on material storage area

- All cylinder must have caps and properly secured on an upright position

- Effect on people health from hazardous fumes

- Provision of secondary containment for liquid materials such as fuel, paint, chemicals etc

- Strictly implement the safe storage conditions and adhere to the MSDS instructions for storage

- Hazardous materials shall be stored separately and not mixed with any combustible or flammable materials

- Never use drinking water bottle as secondary containment for chemicals

- Must provide proper secondary containment dedicated for chemicals

- Fire provisions in presence of all hot works

- Complete PPE must be worn by all operatives

- Hot works to cease before the end of the working day and work inspected prior to completion

- All work areas kept clear of debris and rubbish

- Fire watchman must be designated during hot work operation

- Mandatory prior start of hot work must comply with three requirements: Fire extinguisher available, fire blanket to be use and certified fire watchman in place

4 3 12 condition or operation i.e change in sequencing, new plant/equipment or new workers involved, a new risk assessment will be conducted and further control measures implemented to suit the operation.

Any modifications to working conditions or operations, such as changes in sequencing, the introduction of new equipment, or the involvement of new personnel, will necessitate a new risk assessment This assessment will ensure that appropriate control measures are put in place to align with the updated operational requirements.

Any alterations to working conditions or operations, such as changes in sequencing, the introduction of new equipment, or the involvement of new workers, will necessitate a new risk assessment This assessment will ensure that appropriate control measures are implemented to align with the updated operational requirements Given that the Risk Rating Number (RRN) exceeds 6 for this activity, it is classified as a Job.

- Effects on people health due to smoke and fumes

- Property damage due to fire

- Provision of suitable respiratory protection

- Implementation of fire prevention policy

- Materials to be stored according to manufacturer’s specification and guidance

- Materials to be stored free from ignition sources

- Smoking will be prohibited in storage location

- Suitable fire provisions located in storage area

- Strictly implement the safe storage conditions and adhere to the MSDS instructions for storage

- PPE to by worn by all personnel

- Spill control barriers and secondary containment

- Implementation of fire prevention policy

Frequency Severity Risk Factor Number (RFN) Residual Risk Number (RRN) * Prepare Job Safety Analysis when RRN is > 6

1: Unlikely/Improbable 1: Negligible 1 - 2 Trivial/Acceptable 1-2: Trivial/Acceptable L1 - Likelihood as is

2: Remote 2: Slight 3 - 5 Tolerable 3-5: Tolerable L2 - Likelihood with mitigating controls in place

3: Quite Possible/Occasional 3: Moderate 6 - 9 Moderate/Acceptable with review 6-9: Moderate/Acceptable with Review S1 - Severity as is

4: Likely/Probable 4: Critical/High 10 -15 Substantial 10-15: Substantial S2 - Severity with mitigating controls in place

5: Very Likely/Frequent 5: Catastrophic/Very High 16 - 25 Intolerable/Unacceptable 16-25: Intolerable/Unacceptable

Any modifications to working conditions or operations, such as changes in sequencing, the introduction of new equipment, or the involvement of new personnel, will necessitate a new risk assessment and the implementation of appropriate control measures Given that the Risk Rating Number (RRN) exceeds 6 for this activity, a Job Safety and Environmental Analysis (JSEA) will be carried out.

RRN >6 for this activity therefore a JobSafety and Environmental Analysis (JSEA) shall be conducted.

CALCULATION FOR FABRICATION YARD AND STOCKPILE YARD OF

I FABRICATION YARD CALCULATION OF RAKUNA BLOCK

Rakuna 4T 22 sets and 11 bottom plates

Rakuna 8T 58 sets and 29 bottom plates

With 03 bottom plates for 02 side plates so select 03 lines of fabrication area

Internal road for casting: 2160.00 m2 (03 road with 6m in width)

Time for casting Rakuna: 210 days

II STORAGE YARD CALCULATION FOR RAKUNA BLOCK

Starting date of casting: 20-Apr-20

Finishing date of casting: 17-Dec-20

Starting date of installation: 17-May-20

Finishing date of installation: 30-Mar-21

Quantity of inventory to 17-May-20: 940.52 pcs

Maximim Quantity of inventory: 2727.71 pcs

Area for storage yard of Rakuna: 24550 m2

More stock yard area for Rakuna: 9370 m2 This area will be arranged along L3-L5

I FABRICATION YARD CALCULATION OF RAKUNA BLOCK

No Type of Block Dimention Quantity Formwork (set) Finishing time

CALCULATION FOR AREA FABRICATION AND STORAGE OF RAKUNA

CALCULATION FOR AREA FABRICATION AND STORAGE OF CONCRETE BLOCK

No Type of Block Dimention Quantity Formwork (set) Finishing time

Fabrication area for 01 Block: 20 m2 (distance between each one is 1m)

II STORAGE YARD CALCULATION FOR CONCRETE BLOCK

1 Time for casting concrete block:

Starting date of casting: 8-Apr-20

Finishing date of casting: 16-Jun-20

2 Time for installation concrete block:

Starting date of installation: 9-May-20

Finishing date of installation: 6-Jul-20

3 Storage yard of Concrete block:

Quantity of inventory to 16-Jun-20: 176.12 pcs

Because productivity of installation is more than productivity of fabrication so:

Maximim Quantity of inventory: 176.12 pcs

Area for storage of Rakuna: 1188.78 m2

CALCULATION OF WATER ABSORBENT

CALCULATION FOR WATER ABSORTENT TO FOUNDATION PIT OF

+ Calculate the amount of water that penetrates to the foundation pit with high water level: +1.91m

+ Absorbent area of existing ground: soil layer 3-Clay sand with gravel:

+ Absorbent coefficient of soil layer 3-Clay sand with gravel:

K 1 = 5x10 -7 m/s Reference to “ Swiss Standard SN 670 010b, Characteristic Coefficients of soils, Association of Swiss Road and Traffic Engineers”

+ Absorbent area of existing ground: soil layer 6A-Coral rock:

+ Absorbent coefficient of soil layer 6A-Coral rock:

 Carter, M and Bentley, S (1991) Correlations of soil properties Penetech Press Publishers, London

 Leonards G A Ed 1962, Foundation ENgineering McGraw Hill Book Company

 Dysli M and Steiner W., 2011, Correlations in soil mechanics, PPUR

+ Absorbent area of filling soil of temporary dyke - Clay sand:

+ Absorbent coefficient of filling soil - Clay sand:

 Swiss Standard SN 670 010b, Characteristic Coefficients of soils, Association of Swiss Road and Traffic Engineers

 West, T.R., 1995 Geology applied to engineering Prentice Hall, 560 pp

+ Due to formular (2) of TCVN 8731:2012

+ We have Absorbent quantity in to foundation pit of Temporary Unloading Ramp:

With the pump height is 9.1m, the pump length is about 45m (1m pump height is similar to 10m pump length) so total of pump height is 9.1 + 4.5 = 14.6m

We choose type of pump with frequency 50Hz and curve No 3, free standing as below table:

According to relationship chart between the height of water pumping and quantity of pumping as below:

With the height of water pump is 17m we have quantity of pump is 4 (m 3 /min) ~ 240 (m 3 /h) so we choose 01 pumps Tsurumi 250B622 (or other with similar capacity)

After finishing temporary dyke the contractor shall test absorbent quantity to verify the calculation

PLAN OF FACILITY AREA

CALCULATION FOR TEMPORARY JETTY

CALCULATION STABILITY FOR TEMPORARY JETTY

Calculation for the most dangerous case when the water level is low : LWL = -0.98 (NDT)

Soil Investigation Report of Bore hole BHO-2

- Layer 2: Loose, whitish grey, Sand with quartz gravel

- Layer 6B: Highly weathered rock zone IA2, blue grey

- Layer 5: Clay with Weathered rocks

The most dangerous case is to use a 250T crane as show

Trailer Load Data for Crane 250T (9 axcels)

II Calculation stability for vertical jetty:

Figure 1 Circular Slip of vertical jetty

According to work analysis of softwave GeoStudio 2012 (SLOPE/W), Stability coefficient of inclined temporary jetty is 1.394 > 1.0 so structure of vertical temporary jetty match requirements

Tiêu đề	Method Statements For Shore Protection And Temporary Unloading Ramp
Trường học	Van Phong 1 BOT Thermal Power Plant Project
Thể loại	for approval
Năm xuất bản	2020

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Số trang	110
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