MS 002 01 r1 approved

G ENERALThis method statement covers the Soil Investigation works which may beundertaken in connection with the works and which is subject to theEngineer’s direction in accordance with S

b) Each copy is issued to a particular person or organization If the

document is no longer required it should be returned to the relevant person;

c) It is not to be photocopied either in whole or in part Additional copies are available on request;

d) Copy holders will be automatically issued with any amendments

Responsibility for incorporating such amendments rests with the copy holder.

01 6 / 9 / 06

TABLE OF CONTENTS

1.2 T ERMS OF R EFERENCE 3 1.3 R EFERRED D RAWINGS 3

5.1 O RGANISATION C HART 12 5.2 S UPPLIERS / S UB -C ONTRACTORS 12 5.3 L IST OF M ACHINERY / E QUIPMENT 13

TABLE OF CONTENTS (CONT’D)

APPENDICES (CONT’D):

2 I NSPECTION AND T EST P LAN

3 I NSPECTION C HECKLIST ( S ) / F ORM ( S )

4 S AFETY R ISK A SSESSMENT

5 E NVIRONMENTAL R ISK A SSESSMENT

1 G ENERAL

This method statement covers the Soil Investigation works which may beundertaken in connection with the works and which is subject to theEngineer’s direction in accordance with Sub-clause 1.10.1 of Section 1,

“General Specification”

1.1 Purpose

The purpose of the works is as noted hereunder:

a) To obtain further information pertaining to the prevailinggeological conditions around the piling location areas orelsewhere within the Site to permit relevant design of thetemporary trench shoring system(s) which will be required

i) Working Drawing No L6 - O - 101 “Soil Investigation Plan forLine-6 (01)”

j) Working Drawing No L6 - O - 102 “Soil Investigation Plan forLine-6 (02)”

2 S COPE OF W ORK

2.1 Quantity of Works

Table 2.1 hereinbelow outlines the estimated quantities of worksassociated with Soil Investigation based on the proposals containedherein1:

Table 2.1 Estimated Quantities of Works

1 Boreholes for Conveyance Sewer 6 no , depth ≈ 50m

2 Boreholes for Existing Combined Sewer

Line 1, 3 & 4

20 no , depth ≈ 30m

3 Boreholes for Existing Combined Sewer

Line 2 3 no , depth ≈ 30m

4 Boreholes for Existing Combined Sewer

Line 5

14 no , depth ≈ 30m

5 Boreholes for Existing Combined Sewer

Line 6

19 no , depth ≈ 30m

2.2 Proposed Location

All locations for Soil Investigation boreholes shall remain subject tothe Engineer’s direction and approval For the proposed locationreference is made to Working Drawing No GE - O - 102

2.3 Testing

1 It is to be noted, according to Sub-clause 1.10 of Section 1 “General Specification”, the

The testing listed herebelow is called for by Sub-Clause 1.10 ofSection 1 “General Specification”.

a Standard Penetration

Test (ASTM D 1586) every 1 m

b Vane Shear Test (ASTM D 2573) every 5 m

c Specific Gravity (ASTM D 854) every 5 m

d Natural Water Content (ASTM D 2216) every 5 m

e Grain Size Analysis (ASTM D 422) every 5 m

f Liquid Limit Test (ASTM D 423) every 5 m

g Plastic Limit Test (ASTM D 424) every 5 m

h Wet Density Test (Calliper method) every 5 m

i Unconfined

compression (ASTM D 2166) every 5 m

j Consolidation Test (ASTM D 2435) every 5 m

Boring and sampling Analysing / Testing / Classifying

3.2 Occupancy and Permission

The main equipment required, i.e boring machine, platforms,frames, truck etc., will be mobilised to Site after receipt of therelevant permission / permit from the concerned authority.Permission / permits shall be obtained by the Contractor at it’s owncost

Simultaneously manpower, i.e technicians, operators and workers,will be dispatched in order for preparation, operation and execution

of the works

Based on the current investigations permits to conduct siteinvestigations may be obtained from:

a) Government Authority

Area Management of Urban Transportation No 1

Address: 152 Dien Bien Phu Street, Ward 25, Binh ThanhDistrict,

Contact: Tel: 5123 - 289 Fax: 8035 - 432

Zone Management of Urban Transportation No 2

Address: 163 Dien Bien Phu Street, Ward 15, Binh ThanhDistrict,

Contact: Tel: 5180 - 856 Fax: 5180 - 855b) Required Documentation

Letter of intent, including, as a minimum:

3.3 Boring and Sampling

3.3.1 Equipment System

The system equipment and set-up is detailed hereunder:

a) Set-up drill machine auger at desired hole location andremove soil for examination

b) Drilling auger is propelled downwards hydraulically whilerotating to achieve the desired depth

c) The drilling rods are extended as necessary The rods to

be used are 42 mm in diameter and are supplied in threediffering lengths (1.5m, 2.2m and 4.5m)

d) The drilling auger is withdrawn from the hole and soilsamples are taken for examination

e) Water is continuously circulating through the pump duringboring works If necessary, bentonite may also be added

to aid borehole stabilityf) Bentonite and other waste materials resulting from theworks will be disposed of accordingly and in accordancewith the Environmental Management Plan

The following picture illustrates a typical set-up in theConveyance Sewer Area:

The picture on page 8 hereinafter illustrates a typical set-up forthe Existing Combined Sewer Improvement area (i.e within theCity):

BARRICADE WITH PROJECT INFORMATION SIGN BOARD

Note: Not all barricades have project information

PROJECT INFORMATION BOARD

2000

3.3.2 Boring

General Sequencea) Boring works will only be commenced after the location ofthe machine and associated borehole has been confirmed

by the Engineer or his authorized representativeb) Frame and platform for the boring machine will be set-up

in the correct positionc) Initial drilling rods will be installed and adjusted prior tocommencement of operations

d) If deemed necessary a trial run of the equipment may beconducted

Boring processa) Boring will be performed using rotary drilling rigs of thetype pictured above

b) The borehole diameter is typically 110mmc) Subject to other directions as may be received from theEngineer drilling shall be performed to the depthsdescribed in Sub-Article 2.1 on page 4 hereof A standardrotary drilling method will be utilised for this purpose Ifdeemed necessary the borehole may be stabilized bycasing or bentonite as appropriate

d) Throughout the course of the drilling disturbed andundisturbed samples will be taken in accordance with thedetails contained hereinafter Standard Penetration andVane Shear Tests shall be carried out in-situ

3.3.3 Sampling and Testing

Sampling

Samples will be taken at the Site and transported to anindependent laboratory for testing of their physical properties.Sampling shall take be either Undisturbed or Disturbed asdetailed hereinbelow:

a) Undisturbed Samples (UD’s)UD’s are to be collected from the borehole(s) and all strataencountered

For soft soils, sample collection will be by means of a 73

mm diameter thin-walled sampler with a length of 1,000

mm using driven or hydrological methods In other cases

a Denson sampler, 73 mm diameter and length of 1,000

mm, will be used

Sample intervals are 5 metres and, based on the lengths

of boreholes contained within Sub-Article 2.1 on page 4hereof, the number of samples is estimated to be in theregion of 396

Immediately upon removal from the borehole UD’s will bevisually examined and identified then described at the topand bottom ends of the tube which shall subsequently becarefully sealed with paraffin wax, labelled andtransported to the laboratory

UD’s shall be preserved and transported in accordancewith ASTM in order to secure the performance of thesubsequent laboratory test and results

The collected UD samples will be used for unconfinedcompression testing

b) Disturbed Samples (D’s)D’s are collected from all strata encountered using thesplit-barrel sampler commonly used for StandardPenetration Testing

Sample intervals are, on average, 5 metres and, based onthe lengths of boreholes contained within Sub-Article 2.1

on page 4 hereof, the number of samples is estimated to

be in the region of 396

Immediately upon removal from the borehole D’s will bevisually examined and identified then packed, marked andstored in thick plastic bags, each marked with a uniqueidentification and description The samples will thensubsequently be transported to the laboratory

The collected D samples will be used for physical propertytesting

c) Groundwater ObservationThe groundwater level in each hole will be measured andrecorded 24 hours after completion of the boring works

Testing

Testing will be conducted at an independent laboratory

a) Standard Penetration Test (SPT)The purpose of this test is to determine the stiffness ordensity of the soil layers encountered by measuring theirN-value

Testing will be conducted in accordance with ASTM D 1586

The penetration resistance, i.e N-value, is expressed asthe number of blows of a 63.5 kg hammer freely dropping76.0cm required to force a standard split spoon sampler topenetrate the soil to a depth 45 cm The number of blowsfor each 15cm is recorded and the N-value is recorded asthe total number of blows required for the last 30.0 cmpenetration of the sampler.

b) Field Vane Shear Test (FVS)The purpose of this test is to determine the un-drainedshear resistance of the strata in question in it’s natural andre-mould conditions

Sample intervals are 5 metres, commencing from 5mbelow existing ground level

Testing will be conducted in accordance with ASTM D 2573.Equipment utilised shall be ZSZ-1 equipment made inChina Results shall be attached to each boreholeinvestigation report

c) Laboratory TestsThe purpose of the laboratory tests is to determine thephysical-mechanical characteristics and engineeringproperties of undisturbed soil samples

Laboratory tests shall be carried out in accordance withASTM standards at a laboratory approved by the Engineer.Laboratory tests are classified as follows:

• Visual and manual examination

of samples

3.4 Analysing / Testing / Classifying

After collecting the relevant samples they shall be suitably packed,identified and transported to the laboratory for testing thereat

The results of the tests will be analysed, classified and submitted in

a final report to be furnished to the Engineer

a) Visual and Manual Examination of Samples

After being opened the samples will be visually and manuallyexamined for preliminary classification in accordance with theUnified Soil Classification System (ASTM D 2487) and selection

of appropriate laboratory test(s)

b) Soil Classification Test

• Specific Gravity ASTM D 854

• Natural Water Content ASTM D 2216

• Grain Size Analysis ASTM D 422

• Wet Density Calliper Methodc) Soil Deformation Test

These tests include:

• Unconfined compression ASTM D 2166

• Consolidation ASTM D 2435Detailed laboratory results of the soil sample tests will beincluded within the appendices for each borehole report

made to Appendix No 1 hereto:

a) Preparatory works, drilling, sampling, Site test 34 days (incl.Test at Site)

38 days (Laboratorytesting)

b) Intermediate Report (if necessary) 42 days

c) Final geotechnical investigation report 42 days

Total = 50 days for approximately 1,980 metres of boring

[TBC]

QC Manager

L De Ocampo

Safety Officer [TBC]

Engineer Engineer

Sub-Contractors

5.2 Suppliers / Sub-Contractors

Company Name: Research Centre for Technology and Industrial

Equipment (RECTIE),HCMC University of TechnologyAddress: 268 Ly Thuong Kiet Street, District 10, HCMC

Tel No.: (848) 865 1664, 964 5398

Fax No.: (848) 864 5398

Contact: Mr Dau Van Ngo, Vice Director

5.3 List of Machinery / Equipment

tools Water tank, drill rod, coreboxes and accessories Various

Depending on the progress of the works, the allocation of staff andequipment shall be subject to adjustment commensurate with theactual Site condition

6 Q UALITY C ONTROL

All works associated with the Soil Investigation shall comply with therequirements of the Management System and Quality Control Plan, asmay be amended from time to time

Generally the following principles shall be adopted:

a) At the completion of each borehole, the depth of drilling shall beinspected by the Engineer or his authorised representative

b) During collection of the samples and execution of the laboratorytests random inspections may be carried out by the Engineer or hisauthorised representative at the Engineer’s discretion

c) All tests shall be executed in accordance with the procedure stated

in the Specification

6.1 Inspection and Test Plan

Appendices No.’s 2 and 3 hereto outline, respectively, the

Inspection and Test Plan applicable to the Initial Survey Works andthe Inspection Checklist(s) / Form(s)

Appendix No 2 hereto nominates the inspection steps to be

implemented in order to ensure that the required quality, and

substantiating records, are maintained while Appendix No 3

details the inspection records which are to be completed,maintained and filed on Site

6.2 Non-Conformance Report

During the execution of the works, if a written complaint, via a siteInstruction or similar, is received from the Engineer or the Employer,and the complaint is justified then action will be initiated by theContractor A Non-Conformance Report shall be completed and arecord thereof shall be retained by the Contractor

7 S AFETY M ANAGEMENT

All works described herein shall comply with the requirements of theapproved Occupation Health, Safety and Rehabilitation Plan and ProjectSafety Plan

Specific Safety considerations:

a) General

• Experienced operators / technicians will be employed tooperate the boring machine(s)

• Plant and machinery will be inspected regularly

• Sufficient lighting shall be provided to the areas inquestion in the event the works are executed at night

b) All workers shall wear appropriate PPE, i.e helmet, shoes, glovesetc as deemed necessary in accordance with the PPE matrixcontained within the Project Safety Plan

c) First aid facilities shall be available

Appendix No 4 hereto includes the completed Safety Risk Assessment

for the Soil Investigation Works

Appendix No 5 hereto includes the completed Environmental Risk

Assessment for the Soil Investigation Works

9 R EVISION R ECORD

On pages 15 and 16 hereinafter a narrative description of revisions tothe original Initial Soil Investigation Method Statement is included

MS-002 Soil Investigation Revision No 1 - List of Changes / Incorporations

Item No Description 2 Changes / incorporations made

1 Page 3 Referred Drawings All referred

drawings shall be attached to this MS

The referred drawings were submitted for Engineer’s Approval in advance of this revision (refer to attachment to Contractor’s letter ENG-0040 dated 5 September 2006) It is contractor’s intention to submit contractor’s drawings separately, as they are not a part of this document and an individual approval is

required for each drawing.

2 Page 4 of 14 Sub-Clause 2.2 Proposed

Location Drawing showing your proposed Boreholes location shall be attached for Engineer’s review Reduced size of drawings may be sufficient

The referred drawings were submitted for Engineer’s Approval in advance of this revision (refer to attachment to Contractor’s letter ENG-0040 dated 5 September 2006) It is contractor’s intention to submit contractor’s drawings separately, as they are not a part of this document and an individual approval is

required for each drawing.

3 Permission

All necessary permissions required for the execution of Soil Investigation shall be obtained prior to commencement of the Work at the Contractor’s own cost.

Application(s) for the permission shall be submitted to the relevant authorities by the Contractor directly

Reference is made to Sub-Article 3.2 on page 6 of this document Mobilisation of equipment shall only be initiated after receipt of relevant permission / permit In addition the following wording has been added:

“Permission / permits shall be obtained by the Contractor at it’s own cost”

“Application(s) for permission shall be submitted to the relevant Authority by the Contractor directly together with a support