110509 WSA 062 MS for box culvert construction EN attachment 1

EMPLOYER : :
ENGINEER :
CONTRACTOR
:
Ho Chi Minh City - Long Thanh - Dau Giay
Expressway Construction Project Package No.5
REVISION NO.: 0
PAGE: 1 OF 17
DATE: 2011.05.03
Method Statement for Construction of
Box Culvert
Content
1. General 2
2. Scope of Work 2
3. Reference 2
4. Quantity 3
5. Site Organization Chart
4
6. Equipment and Resources 5
6.1 Equipments 5
6.2 Materials 5
7. Drawings 5
8. Site Facilities 6
9. Work Sequence 6
9.1 Preparation 6
9.2 Setting Out 7
9.3 Box Culverts in Embankment Fill – Soft Foundation 10
9.4 Box Culverts in Embankment Fill – Firm Foundation 10
9.5 Box Culverts in Embankment Cut – Rock Foundation 10
9.6 Box Culverts in Embankment Cut – Soft Foundation 11
9.7 Final Stage 11

10. Quality Control and Quality Assurance 11
11. Risks 12
12. Safety and Environmental Measure 13
General 13
Life Saving Appliances 14
Environmental 14
1. General
Method Statement for Construction of Box Culvert
EMPLOYER : :
ENGINEER :
CONTRACTOR
:
Ho Chi Minh City - Long Thanh - Dau Giay
Expressway Construction Project Package No.5
REVISION NO.: 0
PAGE: 2 OF 17
DATE: 2011.05.03
Method Statement for Construction of
Box Culvert
This method statement provides the details of the materials, the equipment, the procedure
and relevant documents related to the construction of Box Culverts and related activities,
including the quality control verifications, the measurement verifications, and also the
safety precautions to be implemented for this.
Scope of this method statement applies to Construction of Box Culverts at the locations
shown in the contract drawings. Detailed design will be prepared for each location
according to the invert level approved by the Engineer shall be adopted for construction
purpose. The working drawing accompanied with the bar schedule, lapping arrangement
and will be submitted and approval will be taken prior to commencement of site work.
For all temporary diversion during construction, the contractor shall submit a formal
application with the traffic diversion scheme to the appropriate local for notice and

carried out accompanied with the diversion of road pavement shall be similar to the
existing road pavement and throughout the construction period the diverted road shall be
maintained without potholes.
The placing of precast Box culvert are the option it will be implement at site with
Engineer Consent.
2. Scope of Work
• Preparation
• Setting out
• Construction of Bedding Sand and Concrete
• Placing of Precast Box Culvert or In Situ casting as per the Dimensions in
Drawings.
• Finished the work to continuation.
3. Reference Standards
The following Standards in their latest edition shall be particularly applied to the works
covered by this Method Statement.
♦AASHTO M259 Precast Reinforced Concrete Box Sections for Culverts,
Storm Drains, and Sewers
♦ AASHTO T11 Materials Finer than 75-µm (No.200) Sieve in Mineral
Aggregates by Washing
♦ AASHTO T27 Sieve Analysis of Fine and Coarse Aggregates
♦ AASHTO T89 Determining the Liquid Limit of Soils
♦ AASHTO T90 Determining the Plastic Limit and Plasticity Index of Soils
♦ ASTM D543 Evaluating the Resistance of Plastics to Chemical Reagents
♦ ASTM D570 Water Absorption of Plastics
♦ ASTM D638 Tensile Properties of Plastics
♦ ASTM D2240 Rubber Property—Durometer Hardness
Method Statement for Construction of Box Culvert
EMPLOYER : :
ENGINEER :
CONTRACTOR

:
Ho Chi Minh City - Long Thanh - Dau Giay
Expressway Construction Project Package No.5
REVISION NO.: 0
PAGE: 3 OF 17
DATE: 2011.05.03
Method Statement for Construction of
Box Culvert
4. Quantity
Estimated quantity ( bidding quantity ) is as follows. But they are only for reference. The
design quantity will be made from approved working drawings. The actual construction
quantity will be shown on As-built Drawing.
No. Station
Descripti
on
Length
( m )
Skew
Angle
(%)
Element
s
of
Pi
pe
Bedding
Foundation
No. of
El
e

m
en
ts
Length
of
ea
ch
El
e
m
en
ts
1 24+340
1.5mx1.
5m
36.37 90 36 1m
t=0.1
gravel
t=0.3
Conc
C20
2 26+420
1.5mx1.
5m
33.36 90 33 1m
t=0.1
gravel
t=0.3
Conc
C20

3 26+820
2x(1.5m
x1.5m)
31.34 90 31 1m
t=0.1
gravel
t=0.3
Conc
C20
4 27+330
3x(1.5m
x1.5m)
32.35 90 32 1m
t=0.1
gravel
t=0.3
Conc
C20
5 27+842
3x(2.0m
x2.0m)
48.21 101 48 1m
t=0.1
gravel
t=0.3
Conc
C20
6 29+820
2x(1.5m
x1.5m)

41.44 90 44 1m
t=0.1
gravel
t=0.3
Conc
C20
7 30+120
4x(2.0mx2.
5m)
35.38 90 35 1m
t=0.1
gravel
t=0.3
Conc
C20
Method Statement for Construction of Box Culvert
EMPLOYER : :
ENGINEER :
CONTRACTOR
:
Ho Chi Minh City - Long Thanh - Dau Giay
Expressway Construction Project Package No.5
REVISION NO.: 0
PAGE: 4 OF 17
DATE: 2011.05.03
Method Statement for Construction of
Box Culvert
8 31+040 1.5mx1.5m 31.34 90 31 1m
t=0.1
gravel

t=0.3
Conc
C20
9 31+352 1.5mx2.0m 37.4 90 37 1m
t=0.1
gravel
t=0.3
Conc
C20
10 32+980
4x(2.0mx2.
5m)
31.34 90 31 1m
t=0.1
gravel
t=0.3
Conc
C20
11 34+218 1.5mx2.0m 32.31 90 32 1m
t=0.1
gravel
t=0.3
Conc
C20
12 35+070 1.5mx2.0m 32.35 90 32 1m
t=0.1
gravel
t=0.3
Conc
C20

13 36+060 2.0mx2.0m 61.6 130 61 1m
t=0.1
gravel
t=0.3
Conc
C20
14 36+700 1.5mx1.5m 43.46 90 43 1m
t=0.1
gravel
t=0.3
Conc
C20
This shall be carried out in accordance with 07950 in Part 2 section 6 as specified in the Employer’s
requirements.
5. Site Organization Chart
The site organization chart is shown as below.
Method Statement for Construction of Box Culvert
Project Director
Construction Manager
QA/QC Manager / Site Manager
Site Engineer
Surveyor
QC Engineer
EMPLOYER : :
ENGINEER :
CONTRACTOR
:
Ho Chi Minh City - Long Thanh - Dau Giay
Expressway Construction Project Package No.5
REVISION NO.: 0

PAGE: 5 OF 17
DATE: 2011.05.03
Method Statement for Construction of
Box Culvert
6. Equipment and Resources
6.1 Equipments
No Machine Qty
1 Excavator/or Backhoe 02
2 Mobile Crane (Box Laying) 01
3 Dump Trucks 01
4 Rammer / Plate Compactor 04
5 Water Bowser 01
6 Water Pumps 02
7 Rock Drilling Machine (If trench involves rock excavation){If Required} 01
8 Concrete Vibrators As required
9 Concrete Truck Mixers As required
10 Concrete Pump car As required
Note: above stated quantity of equipments could be changed if any required and necessary
6.2 Materials
Method Statement for Construction of Box Culvert
Sub-contractor
Project Manager
Site Manager
Site Engineer
Foremen
Operator
Worker
EMPLOYER : :
ENGINEER :
CONTRACTOR

:
Ho Chi Minh City - Long Thanh - Dau Giay
Expressway Construction Project Package No.5
REVISION NO.: 0
PAGE: 6 OF 17
DATE: 2011.05.03
Method Statement for Construction of
Box Culvert
No. Category Quantity
1 R/C s Box Culverts. As required
2 Backfilling Soil Material As required
3 Bedding Sand As required
4 Concrete C-20 for lean Bedding As required
5 Plastic Water Stop As required
6 Mastic Bitumen As required
7 Bituminous sheet As required
8 Cement Mortar C-10 As required
9 Steel Plates(steel shape and Plate) As required
Note: Samples of materials shall be submitted separately.
7. Drawings:
After obtaining the approval for Construction drawings, base on the contract shall be
carry out the scope of work.
8. Site Facilities
• Available access roads will be used for the necessary machinery and Equipment to
delivering.
• Provide access (Service/Temporary roads) as accepted by engineer for public beyond
ROW.
9. Work Sequence
Flow Chart
Method Statement for Construction of Box Culvert

Step 1 – Preparation and Setting out
Step 2 – Construction of Bedding
Step 3 – Placing of Precast Box Culvert
or Cast Insitu at Site as per Engineer’s
Consent
EMPLOYER : :
ENGINEER :
CONTRACTOR
:
Ho Chi Minh City - Long Thanh - Dau Giay
Expressway Construction Project Package No.5
REVISION NO.: 0
PAGE: 7 OF 17
DATE: 2011.05.03
Method Statement for Construction of
Box Culvert

9.1. Preparation
The Contractor will maintain an adequate number of trained and experienced
supervisors and foremen at the site to supervise and control work. Adequate number
of labours will be maintained for all construction activity including skilled masons,
skilled carpenters and skilled person to operate the vibrators.' All construction other
than concrete will be confirmed to the requirements prescribed in other sections of
the specification for the several items of work entering into complete structure.
Prior to commencement of the work, the Engineer will be requested to participate for
a joint site visit & to confirm the location of the Drainage Box Culverts as given on
the drawing (Plan & Profile). Where possible the Engineer will confirm the
foundation applicable at each particular location as specified in drawings. The
length/ width/section type of the Box Culverts will be requested in embankment
filling or cutting for purpose of Box Culverts constructions. The preparation of

construction drawings will then proceed in consideration of the ground conditions
and above data to ensure that the steps of the procedure are fully complied with
during the activities as per section 7950 clause 3.1 of technical specification such as
setting out, excavation, embankment filling, formwork, reinforcement, concreting,
backfilling and other activities etc. certain inspections and verifications will be
carried out as outlined in the attached Inspection & Test Plan Measurements relative
to construction Drainage Box Culverts will be taken off from the approved drawings.
Variations if will be recorded during the course of the works, the relevant drawings
will be revised accordingly and obtain approval from the Engineer.
9.2. Setting out
• Setting out will be carried out with the help of the survey data provided in the
drawings.
• If required, the existing stream flow will be diverted so that the new construction
works will not be affected by the water flow
• Survey Records for joint measurements all Excavation works
• Survey Records for joint measurements all filling works
Method Statement for Construction of Box Culvert
Step 4 – Backfilling
EMPLOYER : :
ENGINEER :
CONTRACTOR
:
Ho Chi Minh City - Long Thanh - Dau Giay
Expressway Construction Project Package No.5
REVISION NO.: 0
PAGE: 8 OF 17
DATE: 2011.05.03
Method Statement for Construction of
Box Culvert
• Site measurements for pipe length

• Tolerances
Horizontal and Vertical Control.
Staking Phase Horizontal Vertical
Control points ± 5 mm ± 3 mm
Centerline points (a) – (PoC), (PoT) ,(PoT) and
(PoC ) including references thereto
± 5 mm ± 3 mm
Other center line points ± 10 mm ± 10 mm
Cross-Section points, slope stakes, and slope
stake reference (b)
± 20 mm ± 10 mm
Culverts, ditches, and minor drainage structures ± 10 mm ± 10 mm
Retaining walls ± 10 mm ± 10 mm
Railroad crossing structures ± 3 mm ± 3 mm
Bridge Substructure ± 5 mm ± 5 mm
Bridge Superstructures ± 3 mm ± 3 mm
Clearing and grubbing limits ± 200 mm
Roadway subgrade finish stakes ± 10 mm ± 10 mm
Roadway finish grade stakes ± 3 mm ± 3 mm
Note : (a): Center line points are point of curve ( PoC), point of Tangent (PoT) and point on curve ( PoC)
(b): Take the cross sections normal to centerline within ± 1 degree (0.02 rad)
• Acceptance Criteria
The finished dimensions of box culverts shall be as follows;
Dimension Tolerances
Box Culvert
Wing wall
Apron
Approach
Slab
Center Position

±5 mm
Top Level
±5 mm
Method Statement for Construction of Box Culvert
EMPLOYER : :
ENGINEER :
CONTRACTOR
:
Ho Chi Minh City - Long Thanh - Dau Giay
Expressway Construction Project Package No.5
REVISION NO.: 0
PAGE: 9 OF 17
DATE: 2011.05.03
Method Statement for Construction of
Box Culvert
Invert Level
±5 mm
Dimension
Inner & Outer
10 to +20 mm*
Verticality
1 in 300
Top Grade
Irregularities
±2.5 mm
• Construction of Box Culvert.
Bedding
• Sand bedding shall be arrange the detail given in drawings as 100 mm thick, Material
as specified in 2.2 of Section 07950 .Sand PI ,LL and Gradation as specified.
• Lean Concrete Bedding

• C-20 lean concrete bedding as specified in drawings and Concrete as per section
07100 in technical specification.
• Cut off Plates (water Stop)
• As per drawings and specified in 2.2.2 in technical specification.
Method Statement for Construction of Box Culvert
EMPLOYER : :
ENGINEER :
CONTRACTOR
:
Ho Chi Minh City - Long Thanh - Dau Giay
Expressway Construction Project Package No.5
REVISION NO.: 0
PAGE: 10 OF 17
DATE: 2011.05.03
Method Statement for Construction of
Box Culvert
(A) Installation of Box Culvert
Contractor used the pre cast box culvert from approved sources and place by
segments (pre cast boxes) as specified in drawing as consent given by the Engineer.
It will be place in the required ground stipulated after the given below treatment for
foundation. Used Mobile crains for this matter and will evaluate the relevant
dimension and detail for measurements.
(B) Cast in Place of Box Culvert
Formwork, false work and Centering
Formwork will be included temporary and permanent moulds for forming concrete
and tight and rigid enough to maintain the concrete in position during placing,
compaction, setting and hardening. The design calculation with typical sketches
showing the thickness of molding plates, details and intervals of struts and side
supports shall be submitted for verifications.
Engineer's approval will be taken before placing concrete for all formwork, false

work and centering. For detailed information regarding inspection requirement of
formwork, all the approval of the material quality shall be obtained from the
Engineer reasonably before commencement of work.
Reinforcement
All reinforcement will be placed, supported and secured in accordance with the
requirement of section 07500 reinforcement and approval from the Engineer will be
taken before beginning of concrete operation. An experienced steel fixer will be
present while all concrete is placed to ensure that no reinforcement becomes
displaced. Before placing the bars shall be cleaned with wire brushes to remove rust.
Placing Concrete
All concrete will be placed within the times specified. (Concrete Structures) in such
a manner as to avoid segregation and the displacement of reinforcement bars. Ready
mixed concrete and concrete truck mixer will be used ' Chute /skip bucket 1 ,
Concrete pump car will be used when concrete to be placed with vertical distance of
more .Concrete will be thoroughly compacted by concrete vibrator during the
operation of placing. Adequate working condition concrete vibrators will be
available prior to the concrete pour with one or two reserve vibrators. Before initiate
placing concrete PVC ducts will be placed for lighting and other services as stated in
drawings.
Method Statement for Construction of Box Culvert
EMPLOYER : :
ENGINEER :
CONTRACTOR
:
Ho Chi Minh City - Long Thanh - Dau Giay
Expressway Construction Project Package No.5
REVISION NO.: 0
PAGE: 11 OF 17
DATE: 2011.05.03
Method Statement for Construction of

Box Culvert
At the pour point, the concrete Cylinder shall be cast by laboratory technician to
determine the compressive strength of the concrete. Slump test shall be carried out
each mixer truck before placing the concrete. An inspection sheet will be forwarded
to the Engineer to receive the Engineer's certification for placing concrete in
accordance with the Inspection Test Plan for Concreting Works. Concrete
temperature will be maintained by contractor as specified.
Curing and Removal of formwork
All concrete surfaces will be kept wet for minimum 7 days after placing concrete by
water or by the use of wet burlap. The formwork will be removed according subject
to mandatory Engineer's approval.
9.3. Box Culverts in Embankment fill - Soft Foundation
The Engineer will be required to issue his instructions for the removal of the
unsuitable material to a specified width, length and down to a specified depth, or
provide other instructions for ground treatment at the option of the Engineer. No any
ground treatment in Our BOQ for this project.
Embankment filling & compaction will be carried out in layers as stated in the
Method Statement for Earth Work. Compaction testing will be done as specified in
the technical specifications.
An inspection sheet will be forwarded to the Engineer to receive the engineer's
certification for completion of the work instructed by the Engineer.
Then the procedure mentioned above will be adopted to perform the task as Method
1 and Method 2.
9.4. Box Culverts in Embankment cut - Firm Foundation. (Soil)
Excavate the trench with the help of excavator down to the required level and
additional excavation of 500mm from out side of the footing. Excavated material
deposit in storage piles for the further use of backfilling. Side slope will be trimmed
and benched.
Then the procedure mentioned above will be adopted to perform the task as Method
1 and Method 2.

Method Statement for Construction of Box Culvert
EMPLOYER : :
ENGINEER :
CONTRACTOR
:
Ho Chi Minh City - Long Thanh - Dau Giay
Expressway Construction Project Package No.5
REVISION NO.: 0
PAGE: 12 OF 17
DATE: 2011.05.03
Method Statement for Construction of
Box Culvert
9.5. Box Culverts in Embankment Cut - Rock Foundation
Excavate the trench by blasting in accordance with the blasting pattern approved by
the Engineer. This additional excavation will be backfilled with approval material.
Rock excavation will be performed as mentioned in the Method Statement for
Earthwork and the Construction Procedure for Rock Blasting works. Dimension of
the trench varies in accordance with the drawings.
Then the procedure mentioned above will be adopted to perform the task as Method
1 and Method 2.
9.6. Box Culverts in Embankment Cut - Soft Foundation.
If the ground material observes soft, spongy or unstable, seek for Engineers approval
to remove and replace the soil. The excavated area will be backfilled with granular
material and compacted up to the original ground level as specified. Excavate the
trench with the help of Excavator down to the required level. Additional excavation
will be done according to foundation soil condition and backfill up design level.
Where necessary, the slopes of the trench will be shored to ensure cutting angle.
Slope will be trimmed and benched to protect collapsing excess soil and steel timber
piles arranged for shoring work. In the case of excess water along the trench,
dewatering will be arranged with adequate water pump. Dimension of the trench

varies in accordance with the relevant drawings.
Pile will be driven as stated in the Method Statement for Concrete Piling according
to the ground condition and Engineer's instructions.
Then the procedure mentioned above will be adopted to perform the task as Method
1 and Method 2.
9.1 Final Stage
Embankment filling & compaction will be carried out in layers up to required design
as level shown in contractor's detailed Drainage Box Culverts vary in each location.
Density testing for the Embankment works will be done as specified in the technical
specifications.
Backfilling will be commenced after the Engineer's consent. Suitable classified fill
material will be used as backfill material. Backfill layers will be compacted using
plate compactor and/or rammer. Compaction testing will be done as specified in the
technical specifications.
Method Statement for Construction of Box Culvert
EMPLOYER : :
ENGINEER :
CONTRACTOR
:
Ho Chi Minh City - Long Thanh - Dau Giay
Expressway Construction Project Package No.5
REVISION NO.: 0
PAGE: 13 OF 17
DATE: 2011.05.03
Method Statement for Construction of
Box Culvert
An inspection sheet will be forwarded to the Engineer to receive the Engineer's
certification for completion of backfilling and compaction for each Drainage Box
Culverts in prior to commence the adjacent Embankment filling.
10.Quality Control and Quality Assurance

Material
Materials shall be submitted for Engineer’s approval prior to delivery onsite
( sample, supplier, material sources…etc ). The major materials used for the
construction of Box culverts include, but are not limited to the following.
♦ Reinforced Concrete box (Pre-Cast) from approved manufacturer as accepted by the
Engineer.
♦ Cement mortar as stated and from approved Cement.
♦ Structural Backfill Materials as approved by Engineer.
♦ Bedding Materials as approved by Engineer as indicated above as Sand and lean
concrete bed C-20 concrete mix.
♦ Sand Material PI and LL and Gradation tests will be carryout prior to use for
permanent work as specified in specification.
♦ Other relevant material for construction should approved by Engineer as required
prior to use for any work and also test as specified in Specification.

Quality Assurance
Quality Assurance is carried out according to the Project Quality Plan. For the
purpose of Quality Assurance, we are planning to use
♦ Inspection & Test Plan Sheet
♦ Check List – Daywork Record Sheet
♦ Check List – REQUEST FOR INSPECTION CHECK FORM (RICF)
♦ Check List – Measurement Summary
♦ Check List - Confirmation of Verbal Instruction (CVI)
Copy of the each and every Inspection and Test Plan and Check List is filed and keep
in the Site Office.
11. Risks
• Human damages when Pre-cast Box Culvert laying:
Solution:
Method Statement for Construction of Box Culvert
EMPLOYER : :

ENGINEER :
CONTRACTOR
:
Ho Chi Minh City - Long Thanh - Dau Giay
Expressway Construction Project Package No.5
REVISION NO.: 0
PAGE: 14 OF 17
DATE: 2011.05.03
Method Statement for Construction of
Box Culvert
Allocate skill people
Provide safety equipment
• Risk for not selecting the correct trace
Solution:
It shall be verified by survey checking of the trace
Planning of the work
• Handing Excavator, Crain
Solution:
Appoint experience operator
Barricades need to be set out
secure that the is familiar with the machine .
• Language
There will be working employees with different languages. In order to avoid accident
on account of misunderstanding of languages it is necessary for the employer to give
a good and thorough instruction of this method statement.
Solution: Small instruction meetings can be held for clarification so misunderstanding
can be solved between workers
• Construction Operation
Solution: Use the equipments to be use for handling safety manner. Trucks should be
allocated for with capable person. Protection of Road bed and slope during the

construction and protection of the structures as requirement.
12. Safety & Environmental Measures
Prior and during the execution of work on site, basic safety precautions shall be
implemented to work efficiently and to prevent any accident or casualties. This
method contains safety and environmental related matters that have to be take in
consideration before any activities start on site.
General
• All of worker should put on their safety shoes, helmet, vest and leggings. No one
will not be allowed to go on workplace if PPE is not complete.
• Before starting the works, operators and labors should memorize the method,
contents, scope of work.
• The team will be mixed experts and with beginners.
Method Statement for Construction of Box Culvert
EMPLOYER : :
ENGINEER :
CONTRACTOR
:
Ho Chi Minh City - Long Thanh - Dau Giay
Expressway Construction Project Package No.5
REVISION NO.: 0
PAGE: 15 OF 17
DATE: 2011.05.03
Method Statement for Construction of
Box Culvert
• The condition of climate such as temperature, rainfall etc., will be recorded,
researched, contractor shall look for the countermeasure of the climate.
• Installation of safe passageway for labors to move in excavated places.
• Labor to be reminded about the communication, signal when emergency
happened.
• Whenever there should be shifting of the working team, to make sure the taking

over of the work scope and site conditions.
• To check the excavation depth, slope with drawing.
• To reinforce or replace the embedded facilities before starting to work.
• Don’t place or park the heavy equipments near the edge of higher place.
• Checking the water flow line such as river and stream, to prevent the flood water
from inflow in the working area.
• To use the equipment in specified capacity and qualified operators.
• During the operation of heavy equipment, to prohibit the workers to come into the
working range.
• In a place of more than one equipment working in the area, should be keeping the
working space against each equipment.
• To observe and check the earth defection in shape at all time.
Two flagmen shall be assigned on either side of the working area if the available
space is arrow for traffic Warning signs shall be displayed in advance as well as in
working area. Excavated area shall be barricaded with barricading tapes or by placing
traffic cones. Traffic warden jackets are to be provided to all flagmen.
A competent person, properly qualified and experienced, should be appointed to
supervise the Construction operations. This person should be capable of recognizing
and assessing any potential dangers as they arise; e.g., unexpected ground conditions
that may require a change in construction technique, or unusual smells which may
indicate the presence of noxious or dangerous gases.
Safety precautions throughout the Box culvert Construction operations shall comply
with general safety standards to be adopted at a construction site.
Safety arrangement according to the project safety plans.
Risk assessment will be enclosed this method statement.
Life-Saving Appliances
Method Statement for Construction of Box Culvert
EMPLOYER : :
ENGINEER :
CONTRACTOR

:
Ho Chi Minh City - Long Thanh - Dau Giay
Expressway Construction Project Package No.5
REVISION NO.: 0
PAGE: 16 OF 17
DATE: 2011.05.03
Method Statement for Construction of
Box Culvert
The Pumyang and Sungjee shall provide and maintain on the Site sufficient, proper
and efficient life-saving appliances to the approval of the Engineer. The appliances
must be conspicuous and available for use at all times.
Environmental
During the process of construction, installation, Contractor’s constructing units
working in the site must:
• Not to cause pollution exceeding the permissible level for the environment
surrounding the site;
• Discharge harmful elements such as dust, toxic gas, noise etc…;
• Discharge water, mud, wasted materials, soil, sand into the populated area, roads,
ponds and lakes, planting field surrounding the site that cause bad impact on
living and production of the population around.
• Not to cause danger for the population living surrounding the site.
• Not to cause sagging. Cracks, collapse for the surrounding houses, buildings and
technical infrastructure ( cable system, underground pipeline, sewer, ditches etc.,
) surrounding the site.
After construction completion, all construction units must put the site in order, neat
and clean. Remove all excess materials, demolish temporary facilities, repair
damaged parts of surrounding road, sidewalk, sewer and trench, technical
infrastructure, houses and building etc., caused by the construction process strictly in
accordance with initial agreement or current regulations issued by the Government.
The best practices consist of;

• Inorganic waste should be disposed of in an approved sanitary landfill sites away
from the construction areas, or be recycle where this is economically feasible.
• Any remaining organic non-toxic wastes should be ploughed into the soil layers.
• All ground areas where toxic wastes have been spilled should be cleaned using
neutralizing materials.
• All areas where oil has been spilled should be ploughed or tilled using
agricultural implementations, to facilitate the accelerated chemical breakdown of
the oil.
• Such areas should be sown with grass, seeds or shrubs, to ensure they are not
Method Statement for Construction of Box Culvert
EMPLOYER : :
ENGINEER :
CONTRACTOR
:
Ho Chi Minh City - Long Thanh - Dau Giay
Expressway Construction Project Package No.5
REVISION NO.: 0
PAGE: 17 OF 17
DATE: 2011.05.03
Method Statement for Construction of
Box Culvert
immediately returned to agricultural use.
If any other problems occurred in the site, applicable counter measures or prevention
action shall be considered immediately and executed as soon as possible.
Method Statement for Construction of Box Culvert