16 soil investigation report by moh associates (s) pte ltd

8/2/2019 16 Soil Investigation Report by Moh Associates (S) Pte Ltd

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A Integrated Solutions For Global ImpactMAA SingaporePROPOSED ADDITIONS AND

ALTERATIONS AND UPGRADJNGOFNANC~UP~YSCHOOL

ATANCBORVALELINK- SOIL INVESTIGATION SERVICES

Volume1:Factual Report


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A Member of MAA Group Consulting Engineers

MOH AND ASSOCIATES (8) PTE. LTD.J T .I.. t~ Jl~ fD 9 ( .) * P & - ' L : . " " 6)TAIPEI HONG KONG SINGAPORE BANGKOK BEIJING SHANGHAIZa-Chieh Moh, Sc.D.,P.E.F AS CE , F IC E, F IE S, F IE M, F HK IEZa-lee Moh, Ph,D., RE.,F A SC E , F IS tr uc t E , M IE ST .W i ll iam l ambe , S c. D .,F A SC E , F IC EDi rector O f Spec ia l P r o je c t s

Our Ref: S1003/025/1 0

17May 2010Beca Carter Hollings &Ferner (SE Asia) Pte Ltd51 Anson Road#12-51 Anson CentreSingapore 079904

Attn: Ms. Kng May Choo,

Dear Ms, Kng,

PROPOSED ADDITIONS ANDALTERATIONS AND UPGRADING OF NAN CHIAUPRIMARY SCHOOL AT ANCHORVALE LINK - SOIL INVESTIGATION SERVICES- Volume1:Factual Report


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S1 0031 Proposed Additions and Alterations and Upgrading of Nail Chiau Primary School Oil Lot1025W PT MK21 at Anchorvale Link - Soil Investigation Services(Vol l :Factual Report)

TABLE OF CONTENTS

CHAPTER TITLE PAGE

Letter of TransmittalTable of Contents 11List of Figures vList of Tables viList of Standard Symbols Vll

L INTRODUCTION 11.1 General1.2 Scope of Work 14

ll. FIELD INVESTIGATION 5


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TABLE OF CONTENTS

CHAPTER TITLE PAGE

IV. SITE AND SUBSOIL CONDITIONS 1 94 . 1 General Geology 1 94 . 2 Site Condition 1 94 . 3 Subsoil Condition 2 14 . 4 Groundwater Conditions 3 04 . 5 Chemical Contents of Soil and Water Samples 3 0

v: CONCLUSIONS 3 2VI. LIMITATIONS 3 4

REFERENCES 35


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TABLE OF CONTENTS

CHAPTER TITLE PAGE

APPENDIX A: Soil Boring Logs A -1APPENDIX B: Setting-out Survey of Boreholes B-1APPENDIX C: Results of Groundwater Table Measurements C -1APPENDIX D: Results of Natural Moisture Content and Unit

Weight Determination D -1APPENDIX E: Results of Specific Gravity Determination E - IAPPENDIX F: Results of Atterberg Limits Determination F - 1APPENDIX G: Results of Grain Size Distribution G -1APPENDIX H: Results of Consolidated-Undrained (CIU) Triaxial


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LIST OF FIGURES

FIGURE NO. TITLE PAGE

Figure 1.1 Site Location Plan 2Figure 1.2 Proposed Development Plan 3Figure 2.1 Boreholes Location Plan 6Figure 2.2 Water Standpipe Installation 8Figure 4.1 Geological Map around the Site 20Figure 4.2 Layout of Cross-section for Soil Profiles 22Figure 4.3(a) Soil Profile 1-1 (Across Borehole Nos. BH-5, BH-4, BH-l &BH-2) 23Figure 4.3(b) Soil Profile 2-2 (Across Borehole Nos. BH-5, BH-3 & BH-2) 24Figure 4.3(c) Soil Profile 3-3 (Across Borehole Nos. BH-4 & BH-3) 25


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LIST OF TABLES

TABLE NO. TITLE PAGE

Table 2.1 Summary of Field Exploration Work 7Table 3.1 Types and Quantities of Laboratory Tests Performed 10Table 3.2 Summary of Soil Physical Properties 13Table 3.3 Summary of Consolidated Undrained (Cll.I) Triaxial Compression

Test Results 15Table 3.4 Summary of Unconsolidated Undrained (UU) Triaxial Compression

Test Results 16Table 3.5 Summary of One-dimensional Consolidation Test Results 17Table 3.6 Summary of Chemical Content Analysis on Soil and Water samples 18


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S1003 IProposed Additions and Alterations and Upgrading of Nan Chiau Primary School Oil Lot 125W PIMK21 at Anchorvale Link - Soil Investigation Services(Vol. 1 Factual Report)

LIST OF STANDARD SYMBOLS

1) General Soil Propertiese Void ratioG, Specific gravity of soil particles' Y , Total unit weight, leN/m3y d Dry unit weight, kN/m3y" , Unit weight of water, kN/m3w Moisture content, %WL Liquid limit, %Wp Plastic limit, %Ip Plasticity index, %


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Sl003/ Proposed Additions and Alterations and Upgrading of Nan Chiau Primary School 011 Lot 1025W PTMK21 at Anchorvale Link - Soil Investigation Services(Vol. 1- Factual Report)

Ge

G", G\'

Go

U

Ub

p

p

q, q

Deviator stress, kN/m 2Consolidation pressure, kN/m 2Total, effective vertical stress, kN/m 1Total, effective horizontal stress, kN/m 2Cell pressure in triaxial cell, kN/m1Pore water pressure, kN/m2Back pressure in triaxial test, kN/m2


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4) Others:k Coefficient of permeability, em/sec

o Split spoon sampleTube sample

Sample lost

Rock core sample

5) Soil Classification:

Relative Density of Sand Strength of ClaySPT-NValue SPT-NValue UnconfinedRelative Density Compressive Strength Consistency


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GROUPSYMBOL GROUP NAME


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GROUP SYMBOL GROUP NAME

GRAVEl% 0'......1 >" .. nd


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Crite ria lor Assigning Group Symbols and Group Names Using Laboratory Tests"

COARSE-GRAINEO SOILS GravelsMore than 50 ':t retained 011 No. More than 50 % of coarse200 sieve fraction retained 011 No.4

sieve

Cu :: 4 and 1 :$" Cc :s 3"lean GravelsLess than 5 % finesc Cu < 4 and/or 1 :> Cc :> 3EGravels with FinesMore than 12 % fines C Fines classify as ML or MHFines classify as CL or CH

Sands50 ,. or more of coarset raction passes No.4 s ieve

Clean Sands Cu :: 6 and 1 :s Cc s 3 ELess than 5 ,. fines 0 Cu < 6 and/or 1 :> Cc:> 3 ESands with F inesMore than 12 ':t finesD Fines dassify as ML or MHFines classify as CL or CH

PI> 7 and plots on or above "A' line-'INEGRAINED SOILS50 % or more passes the No.200 sieve

Silts and ClaysLiquid l imi t less than 50 inorganic PI PI plots on or above -A-Wine.D PI plots below A' line.

E Cu = O,dD,o Cc: = (0",,)20'0 x 060" If soil conta ins : : 15,. sand. add 'w ith sand- togroup name.o If fines classify as CL-ML. use dual symbol GCGM. or SC-SM.

"If fines are organic. add -with organic fines-togroup name.

'If soil contains ~ 15 ,. graver. add "With gravel"


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I. INTRODUCTION

1.1 General

This geotechnical factual report presents the results of Soil Investigation Services for theProposed Additions and Alteration and Upgrading of Nan ChiauPrimary School, to be developed byMis Singapore Hokkien Huay Kuan on lot 1025W, MK2l, at Anchorvale Link: (Figure 1.1).

According to the information provided by the Engineer, Mis Beca Carter Hollings & Ferner (SEAsia) Pte Ltd, the proposed works comprises the demolition of one (1) teaching block (A3), minor A&Aworks in existing canteen area and construction of one (1) 6-storeys teaching block and an indoor sporthall. Figure 1.2 shows the proposed development plan. The project site is bounded by Anchorva1e Linkon West and HDB apartment blocks (Anchorvale Groove) on North, East and South. At the time of siteinvestigation, the project site was an existing school site.


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201OENGI1003ENGIOTHERSIFIG1-1,GRF


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2010ENGll003ENGIOTHERSIFIG 1.3Oevl PI.n.GRF

PROJECT: PROPOSEDADDITIONS & ALTERATIONS & UPGRADINGTO NANCHIAUPRIMARYSCHOOLAT ANCHORVALE LINK- Soiiinvestigalion ServicesSCALE:

N.T.S.

-]e w e le v at ed i nd o ors p or ts h a ll ( lo c a ti on &o ri en ta ti on m a y v ar y)o

FIG. 1.2 PROPOSED DEVELOPMENT PLAN

. . J . . MOil ANDASSOCIATES (8)~ Consulting Engineers JOB NO. S1003 DES. BY: DWG.BY : CKD. BY : CYK DATE: 17May2010


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1.2 Scope ofWork

The scope of work for the geotechnical engineering service of this project is summarised asfollows: -

(1) Appointing a drilling contractor to drill five (5) exploratory boreholes including soil andwater sampling works and installation of five (5) water standpipes.

(2) Co-ordination and supervision offield investigation and instrument installation works.

(3) Monitoring of groundwater level during the course of investigation.

(4) Conducting laboratory tests for determination of parameters required for geotechnicalanalysis.

(5) Engineering interpretation of subsoil and groundwater conditions, engineering analysis andpreparation of geotechnical reports including the following items.


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II. FIELD INVESTIGATION

2.1 FieldExploration

The field exploration program for the Proposed Additions and Alteration and Upgrading of NanChiau Primary School at Anchorvale Link started on 15 April 2010 and completed on 29 April 2010. Atotal number of five (5) boreholes were drilled to depth of 39.42m to 51.38m below the existing groundsurface (Figure 2.1). Rotary wash boring was carried out for the project as more representativeundisturbed samples and more reliable in-situ tests could be obtained. The drilling and sampling workswere carried out by Mis Grouting Engineers Pte Ltd, under the supervision of Mis Moh and Associates(S) Pte Ltd.

During drilling, Standard Penetration Tests (SPT) and split spoon sampling were carried out inaccordance with BS5930 at 105mto 3.0m intervals or at changes of subsoil strata excluding depths whereundisturbed sampling was carried out. Representative samples were taken from the split spoon sampler


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2010ENGll003ENGIOTHERSIFIG 2.jBH Location Plan.GRF

yJ. MOil AND ASSOCIATES (S)~ Consulting EngineersPROJECT: PROPOSEDADDITIONS & ALTERATIONS & UPGRADING TO NA N CHIAUPRIMARYSCHOOLAT ANCHORVALELINK- S o i ll nv est i ga l iO n Se r vi c es

SCALE:N.T.S.

FIG. 2.1 BOREHOLES LOCATION PLAN

JOB NO. S1003 DES. BY: DWG. BY: CKD. BY: CYK DATE: 17 May2010


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Table2.1 Summary of Field Exploration WorkBorehole Surface Coordinates Date Date Depth of Soil Rock

No. Ele.(m) Northing Easting Started Completed Hole (m) Dri ll ing (m) Cor ing (m) SPT UD WSP PIEza

BH-1 112.547 41547.24 34470.47 15-Apr-10 21-Apr-10 39.42 39.42 0.00 16 2 1 -BH-2 112.591 41519.80 34494.00 22-Apr-10 25-Apr-10 45.39 45.39 0.00 18 3 1 -BH-3 112.343 41499.53 34449.44 15-Apr-10 20-Apr-10 45.42 45.42 0.00 18 2 1 -BH-4 112.588 41534.60 34433.14 21-Apr-10 25-Apr-10 51.38 51.38 0.00 18 2 1 -BH-5 112.397 41516.43 34405.22 26-Apr-10 29-Apr-10 48.31 48.31 0.00 19 3 1 -

~

Total 229.92 229.92 0.00 89 12 5 0Notes: SPT - Standard Penetration Test

UD - Undisturbed SamplesWSP - Water StandpipePIEZa - Standpipe piezometer

PROJECT: Proposed Additions & Alterations & Upgrading of Nan Chiau Primary School at Anchorvale Linkd t! MOH AND ASSOCIATES (S) - Soi/lnvestigation ServicesConsulting Engineers Prepared by : Cl K Checked by: KC Y Date: 17-May-10


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.01 OENG!1 003ENGfOTHERISTANDPIPE-1 003.grf

P.V.C . CAP

r- - ~VENT HOLE. . c : : r-. ..- r-- -.. ~~ ~. V v - L ~ 'Y>.~S$ ,V v - (A LL D IMENS IONN mm)V v - CONCRETEc;- V v -L o . . J V V MINIMUN50 1.0.VC P IPE" " V0., ~ /t..U /' LOCAL SOi l, v -:z : v - /~~ / /~~~

~00000 1 LAYEROF TERRA IM1000 fiL TER CLOTH OR0 EQUIVALENT000000000 3 D IAMETERHOLESAT 15 CENTRESOR 1/3

"0 Z}). 0 CIRCUMFERENCEHACKSAWCUTS ALTERNA TEg~ 0 S ID ES 3 0 C ENTRES0(.11, 0- c> '" 0 Dimension (mm)~ ~ 0 Borehole Standpipe Installation00:: 0 No. No. Dateh d e I. . . _ 05 0


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ill. LABORATORY TESTING

3.1 General

Laboratory tests were performed on selected soil samples to determine physical properties, shearstrength characteristics, compressibility characteristics and chemical contents of different soil layers.Chemical contents analyses were also carried out for groundwater sample collected from the installedwater standpipes. All these tests were carried out in MANs laboratory except for chemical contentanalyses, which were conducted by Mis Lab Services Pte Ltd. The total number and type of testsperformed are listed in Table 3.1.

The following sections give a brief description of each type oftests carried out.

3.2 Phvsical Properties


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TABLE 3.1 Types and Quantities of Laboratory Tests Performed

Items No. Types of Tests No. of Tests Performed

2

345

6

7

8

Specific Gravity (A S T M 0 85 4 :1 99 8)Atterberg Limits(B $13 77:P art 2 :1990 M ethod 4 & 5 )

Moisture Content (B S 13 77 :P art 2 :1 990 M ethod 3 )Total Unit Weight (B S 13 77:P art 2 :1 990 M ethod 7)Grain Size Analysis ( ASTM se. R e ap pr ov ed 1 99 8)5.1 Sieve Method (A ST M D 42 1 :85 )5.2 Hydrometer Method (A S TM 0 42 2:8 3)

Unconso lidated-und rain ed Triaxia ICompression (UU) Test(B S 13 77:P art 7:1 990 M ethod 8)

Isotropically Consolidated-UndrainedTriaxial Compression ( CIU ) TestsIsotropically Consolidated-DrainedTriaxial Compression (CID ) Tests

58

3534

208

8

6


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3.2.3 Determination of Specific Gravity

The specify gravity of the soil grains is determined by comparing the unit weight of the soilgrains with the unit weight of the distilled and de-aired water. The specific gravity test isconducted in accordance with BS1377 PART 2 :1990 Method 8.

3.2.4 Determination of Atterberg Limits

Atterberg Limits, i.e. Plastic Limit (PL) and Liquid Limit (LL), are water content where thebehaviour of a soil sample changes and is very important in soil classification. At the watercontent below the Plastic Limit, the soil behaves like in a "solid" state. At the water contentbeyond the Liquid Limit, the soil behaves as if in the "liquid" state. The difference of watercontent between the Plastic Limit and the Liquid Limit is termed as Plasticity Index (PD.The determination of the Atterberg Limits is conducted in accordance with BS 1377: PART2: 1990 Methods 4 and 5.

3.2.5 Grain Size Analysis

For coarse-grained soils, the grain SIze distribution of the soil is determined from


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3.3.1.2 Unconsolidated-undrained Triaxial Compression (UU) TestsFor UU tests, the soil samples were sheared in undrained condition under an appliedconfining pressure without allowing soil consolidation. One stage of shearing was carriedout for each UU test. The UU test is conducted in accordance with BS1377 Part 7:1990Method 8.

3.4 Compressibility Characteristics

One-dimensional consolidation tests were conducted on samples of fine-grained soil to evaluatetheir compressibility characteristics, such as coefficient of consolidation (Cc), compression index (Cc)and preconsolidation pressure (Pc).

Specimens for consolidation test were prepared from 30mm to 40mm thick slice of undisturbedsample. The outer edge of the slice was trimmed to a diameter slightly larger than the diameter ofoedometer ring. The sharp end of the oedometer ring was then pressed into the trimmed sample carefully.The soil specimen was trimmed at the top and at the bottom of the oedometer ring by using a wire-saw.


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TABLE 3.2 Summary of Soil Physical PropertiesNatural Total Grain Size ( % )Borehole Sample Depth (m) Specific Liquid Plasticity Moisture Unit (ASTM) Unified Soil

No. No. From To Gravity Limit Index Content Weight Gravel Sand Silt Clay Classif icat ion Layer(%) (%) (kN/m3) No.

BH-1 UO-1 2.00 2.15 2.63 38 21 15.6 20.33 1 70 12 17 SC 3UO-1 2.15 2.30 - - - 18.0 19.71 - - - - - 3UO-1 2.30 2.40 - - - 18.6 20.30 - - - - - 3UD-2 4.00 4.20 - - - 8.7 21.80 1 80 19 - 4S-4 7.50 7.95 2.67 51 27 20.4 20.37 5 42 I 53 CH 4S-6 10.50 10.95 - - - 17.5 21.28 2 79 19 - 4S-12 27.00 27.45 - - - 28.4 - 0 90 10 - 5S-15 36.00 36.31 - - - 13.0 21.86 0 63 37 - 6[BH-2 UD-1 2.00 2.50 - - - 14.1 20.82 0 71 29 - 3UO-2 4.00 4.25 - - - 15.1 21.19 2 76 22 - 4UO-3 12.00 12.20 - - - 21.1 19.62 - - - I - - 4UD-3 12.20 12.40 2.67 49 29 18.5 20.62 14 25 61 CL 4S-9 18.00 18.45 - - - 21.4 20.66 2 79 19 - 4S-13 30.00 30.43 - - - 24.7 21.75 3 86 11 - 5S-14 33.00 33.45 - - - - - 6 81 13 - 5S-16 39.00 39.37 - 46 28 14.7 21.68 - - - [ - - 6S-17 42.00 42.44 - - - 23.0 20.56 0 84 16 - 6IBH-3 UD-1 2.00 2.40 - - - 19.0 20.12 0 81 19 - 3UO-2 4.00 4.20 2.61 32 16 8.9 21.30 1 76 6 I 17 SC 4S-4 7.50 7.95 2.65 43 24 16.8 21.28 25 37 38 CL 45-8 15.00 15.45 - - - 17.0 21.99 0 82 18 - 4S-12 27.00 27.45 - - - 19.8 21.70 4 84 12 - 5S-16 39.00 39.40 - - - 28.0 19.77 0 38 32 30 - 6

PROJECT: Proposed Addi tions & Alterat ions & Upgrading of Nan Chiau Primary School at Anchorvale LinkA MOH AND ASSOCIATES (5) - Soil Investigation ServicesConsulting Engineers Prepared by : elK Checked by: KCY Date: 17-May-10

2 01 O E ng \ 1 0 03 e ng \o th er s\ ta b- 1 0 03 .x ls


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TABLE 3.2 ( contd..) Summary of Soil Physical PropertiesNatural Grain Size ( % )Borehole Sample Depth (m) Specific Liquid Plas ticity Moisture Unit (ASTM) Unified Soil

No. No. From To Gravity Limit Index Content Weight Gravel Sand Silt Clay Classification Layer(%) (%) (kN/m3) No.

BH-4 UD-1 2.50 3.00 - - - 21.6 19.55 1 66 33 - 2UD-2 9.00 9.50 - - - 22.2 19.35 1 69 30 - 2$-12 33.00 33.45 - - - 15.4 21.63 - - - I - - 5$-16 45.00 45.42 - - - 15.5 21.29 3 79 18 - 6IBH-5 UD-1 2.00 2.20 - - - 9.7 21.64 0 68 32 - 3UO-1 2.20 2.40 - - - 11.4 21.50 - - - - - 3UD-2 4.00 4.20 - - - 22.5 19.60 - - - - - 3UO-2 4.20 4.30 - 45 24 18.6 20.33 21 36 43 CL 3UD-3 6.00 6.10 - - - 20.0 20.01 - I - - - - 3UD-3 6.10 6.20 - 58 37 21.1 20.12 14 26 60 CH 3UD-3 6.20 6.35 - - - 21.4 19.86 - - - - - 3$-13 30.00 30.45 - - - 25.1 19.88 - - - - - 5$-18 45.00 45.34 - - - 30.8 19.31 - - - - - 6

PROJECT: P ro po se d A dd itio ns & A lte ra tio ns & U pg ra din g o f N an C hia u P rim ary S ch oo l a t A nc ho rv ale L in k. 1 M . . . MOH AND ASSOCIATES (S) - Soil Investigation ServicesConsuftingEngineers Prepared by : ClK Checked by: Key Date: 17-May-10

2 01 O E n g\ 1 0 03 e ng \o th er s\ ta b- 1 0 03 . xl s


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TABLE 3.3 Summary of Consolidated Undrained (CIU)Triaxial Compression Test ResultsEffective

Borehole Sample Test Depth Natural Total Grain Size Distribution (% ) Shear StrengthNo. No. No. (m) Moisture Unit (ASTM) Parameter SoilContent Weight Cohesion Angle of LayerFrom To Gravel Sand Silt Clay Intercept Shearing No.Resistance(%) (kNfmJ) c', (kNfm:2) 0', (deg)

BH-1 UO-1 CIU-1 2.00 2.40 15.6 20.33 1 70 12 17 20.8 37.4 3BH-3 UD-2 CIU-2 4.00 4.20 8.9 21.30 1 76 6 17 14.0 37.1 4BH-2 UD-3 CIU-3 12.00 12.40 21.1 19.61 14 25 61 16.1 22.4 4BH-5 UD-3 CIU-4 6.00 6.35 21.4 19.86 14 26 60 28.3 26.0 3BH-4 UD-1 CIU-5 2.50 3.00 21.6 19.55 1 66 33 0.0 29.5 2BH-5 UD-1 CIU-6 2.00 2.40 9.7 21.64 0 68 32 8.5 34.5 3

Ii! PROJECT : Proposed Additions & Alterations & Upgrading of Nan Chiau Primary School at Anchorvale LinkMOH AND ASSOCIATES (5) - Soil Investigation ServicesConsulting Engineers Preparedby : ClK Checkedby: KCY Date: 17-May-102 01 O E ng \ 1 0 0 3e ng \o th er s\ ta b- 1 0 03 .x ls


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TABLE 3.4 Summary of Unconsolidated Undrained (UU)Triaxial Compression Test ResultsBorehole Sample Test Depth Natural Total Cell Undrained Strain Soil

No. No. No. (m) Moisture Unit Pressure Shear at layerFrom To Content Weight Strength Failure No.

(% ) (kN/m3) (kN/m2) Suo (kN/m2) (% )BH-1 UO-1 UU-1 2.00 2.40 18.0 19.71 30 44.0 17.0 3BH-1 UO-2 UU-2 4.00 4.20 8.7 21.80 65 260.1 4.0 4BH-3 UO-1 UU-3 2.00 2.40 19.0 20.12 30 172.1 4.0 3BH-2 UO-2 UU-4 4.00 4.25 15.1 21.19 65 217.5 3.4 4BH-2 UD-1 UU-5 2.00 2.50 14.1 20.82 30 190.8 5.5 3BH-5 UD-3 UU-6 6.00 6.35 20.0 20.01 95 131.2 2.6 3BH-5 UO-1 UU-7 2.00 2.40 11.4 21.50 35 165.7 16.0 3BH-5 UO-2 UU-8 4.00 4.30 22.5 19.60 60 214.4 8.0 3

PROJECT: Proposed Addit ions & Alterat ions & Upgrading of Nan Chiau Primary School at Anchorvale LinkA.MOH AND ASSOCIATES (5) - Soil Investigation ServicesConsulting Engineers Prepared by : ClK Checked by: KCY Date: 17-May-10

2 01 O E ng \ 1 00 3e ng \o th er s\ ta b 1 00 3 .x ls


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TABLE 3.5 Summary of One-dimensional Consolidation Test ResultsDepth Initial Condition Final Condition I(m) Soil

Borehole Sample Test Natural Initial Natural Final Liquid Plasticity Pc Compression' LayerNo. No. No. From To Moisture Sr(i) Void Moisture Sr{f) Void Limit Index Index No.

Content Ratio Content Ratio Cc(%) (%) (%) (%) (%) (%) (kN/m2)

BH-1 UD-1 CON-1 2.00 2.40 18.6 97 0.503 14.9 100 0.340 38 21 98 0.136 3BH-2 UD-3 CON-2 12.00 12.40 18.5 98 0.504 18.1 100 0.384 49 29 170 0.109 4BH-S UD-2 CON-3 4.00 4.30 18.6 95 0.S23 19.0 100 0.470 45 24 380 0.100 3BH-5 UD-3 CON-4 6.00 6.35 21.1 98 0.577 21.7 100 0.547 58 37 295 0.118 3

!It! PROJECT: Proposed Additions & Alterations & Upgrading of Nan Chiau Primary School at Anchorvale LinkMOH AND ASSOCIATES (5) - Soil Investigation ServicesConsulting Engineers Prepared by : ClK Checked by: KCY Date: 17-May-10201 OEng\ 1003 eng \o t he rs \t ab -1 003 .x ls


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TABLE 3.6 Summary of Chemical Content Analysis on Soil and WaterSamples

1. Soil Samples Total Sulphate Chloride Organic SoilBorehole Sample Depth pH Value Content as 503 Content as CI Content Layer

No. No. (BS 1377: (BS 1377: (BS 1377: (BS 1377: No.Part 3: 1990 ) Part 3: 1990 ) Part 3: 1990 ) Part 3: 1990 )

(m) (%) (%) (%)

BH-1 8-11 24.00 - 24.45 7.23 0.16 - - 5BH-3 8-1 2.40 - 2.85 4.62 0.20 - - 4BH-3 8-15 36.00 - 36.45 7.78 0.17 - - 5


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IV. SITE AND SUBSOIL CONDITIONS

4.1 General Geology

The geological formation of the proposed development site and the surrounding regions are foundto be Alluvial Member (Ka), Transitional Member (Kt) and Old Alluvium as shown in Figure 4.1 whichis extracted from the "Geology of Singapore" published by Defence Science & Technology Agency(DSTA) in 2009. The geological formation is described as follows: -

KALLANG FORMATIONAlluvial Member (Ka)A variable terrestrial sediment ranging from pebble beds through sand, muddy sand, and clayto peat. The member is usually unconsolidated but lightly consolidated beds may be found.

Transitional Member (Kt)

2010ENGll003ENGIOTHERSIFIG4-1.GRF


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S1003 / Proposed Additions and Alterations and Upgrading of Nail Chlau Primary School Oil Lot1025W PT MK21 at Anchorvale Link - Soil Investigation Services(Voll : Factual Report)

4.3 Subsoil Condition

For the convenience of interpretation, simplified soil profiles that are interpolated from theavailable soil investigation results are presented in Figures 4.3(a) to 4.3(c). Layout of soil profile isshown in Figure 4.2. It should be emphasised, however, that due to the various compositions ofgeological formation found at the present site, considerable judgements on the engineering characteristicsof the subsoil have been exercised in delineating these subsoil profiles.

On the basis of a review on the available results of field investigation works and laboratory tests,the subsoil condition at the present site can be classified into the following six (6) layers inview of itsconsistency / relative density and physical properties of clayey I sandy soil.

LAYER 1 [FILL] - Loose to medium dense, Clayey SAND with hardcores and medium stiff,Sandy CLAY

This is a fill layer consisting of loose to medium dense, yellowish brown and grey Clayey SAND withhardcores and medium stiff, yellowish brown Sandy CLAY. This layer was found in all boreholes with

2 0 10 E NG I I 0 0 3E N G IO T H E RS I FI G 4 . 2 C ro ss S e ct io n. G RF


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NN

LEGEND- $ - Boreholes

~:\I,

l'.r;.'"II~ .. . . I .- . l

FIG. 4.2 LAYOUT OFCROSS-SECTION FOR SOIL PROFILESP RO J EC T : . E'. !3 Q .E Q SE D A D D IT IO NS & ALTERAT IONS & UPGRAD ING TO NAN CH IAU, - ,P _ ,_ R ", IM" , A" ,R- , -Y",C",H ",O",O",L"-,A",-TwA",N",C",H -"O",R_,_,V",A ,,,L=E-"L",-IN ,""K ,__~~~~ _ S o il I n ve s ti gat io n S e r vi c es

SCALE:N .T . S ..A. MOll AND ASSOCIATES (S). l l ! ' : ! A . . Consulting Engineers DES. BY:OB NO. S1003 DWG.BY: CKD. BY: CYK DATE: 17May 2010

2010Eng/1003ENGfOTH~RSIFIG4.3(.).grt


36/65

S""I. l: 500 (InA3)lQ 20 30 ~o 50 60 70 80 90 100 110 120 14030 150

R . l f : : ' ~ 1 : I 3 D D115 BH4HS(112.397 m RL ) (112.58B m RL)

Q )110 __.- / 0 -'"_.-1 __.- ~~ /__.- I -,__.-1 4 /105 z, /I .,

1/ c- c: . c : . . c : . I10 . c : . 0 0 0 d{J 6. 11 > 6.

15 . c : . I . c : . 2025 tf;. N 30 6. 0 6- 35 6. 0 OX 0 . c : . . c : .40 . c : . I45 . c : .

X Plastic limit e % ofClay50 6. Liquid Limit . c : . % of Clay + Silt0 Fine grain soi l o Fine grain soi l 0 Water Content (Fine grain soil) % of Clay + Silt + Sand Coarse grain soi l Coarse grain soil Water Content (Coarse grain soil) (100 -6- = % ofSand & Gravel)55FIG 4.5 SIMPLIFIED PROFILE OF PHYSICAL PROPERTIES OF SUBSOIL

PROJECT : PROPOSED ADDITIONS & ALTERATIONS & UPGRADING TO NAN CHIAU PRIMARY SCHOOL AT ANCHORVAlE LINKMOH AND ASSOCIATES (5) - Soi/lnvestigation Services

Consul t ing Eng inee rs Prepared by: ClK !CheckedbY: CYK IDate: 17May2010

2010ENG l l0 0 3 ENGIOTHERSf F IG 4 . 6 N> 100 C on l ou r .GR F


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tv\0

P RO JE CT : P RO PO SE D A DD IT IO NS & AL TERAT IONS & UPGRAD ING T O NAN CH IAU PRIMARY SCHOOL,"",A :wTwAOJ .N"C


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1Ol5W PT MKl1 at Anchorvale Link - Soil Investigation Services(Vol 1 .'Factual Report)

4.4 Groundwater Conditions

Five (S)water standpipes(WSP-l in BH-3, WSP-2 inBH-l, WSP-3 in BHA, WSP-4 inBH-2 andWSP-S in BH-5) were installed in selected during the course of soil investigation for the measurement ofgroundwater. Figure 4.7 shows the plot of groundwater level versus time observed in water standpipes,respectively during the soil investigation period.

Measurements of water standpipe taken during period from 21 April 2010 to 11 May 2010showed groundwater level ranging between RL 111.Sm inBH-2 and RL Il2.0m in BH-4 on 11 May2010. However, due to the limitedmonitoring time, further observation is recommended to verify the true/ stable groundwater condition at the present site. Records of groundwater level measurements arepresented in Appendix C.4.S Chemical Contents of Soil and Water Samples

The results of chemical contents analysis on selectedwater and soil samples (Table 3.6) indicatesthat the sulphate content (expressed as S03) of water sample collected from water standpipe is 0.S2g/1.


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115.0 I IInstrument Borehole GroundNo. No. level, Rl (m)

l3 . WSP-1 BH-3 112.343114.0 --~-~.~.~~ . . . .~ -~, ..~~~~~~~~---~~ - ------------------ - --.~.~.~~,-~.. -- .. -.~ ... ~--- ~ __. . ,~ ' o," ~ ....__. WSP-2 BH-1 112.547 -'i 0 WSP-3 BH-4 112.588.._, 0 WSP-4 BH-2 112.591

s a WSP-5 BH-5 112.397~ 113. 0 . ~~"" . . . . .~ .. "~~~~~-- ----- -------- ..~L.~~ ~o"~_ "~.~. 0'.________. _----------- ~_~_~'c..~

m "_ . " ~~ . ,CY"C '"~T~ __~ -- ------- - ----.--

~~p ::

iA. ..c.. '" .,c,112.0 .. ~ ~ _. _o, ~ ~O~ ~ c ' = " - = .--.~~. -" . - ..L ~ . . . . -= . . . . . . . "' " . . . .- - -0- _ z ; ;/~ A............. _q"V" ~ ~ ,1 3 " ' " " [ b...,....,Q--=- -"" ~0

~ 1ILO '-~~ . . . . . . . . . . . . ~.~~~.---~--- . ~ . ~ _ _ _~ ~~~_~c~ ~~-~.-~~~ "'~,,~"'~"",,--.~,-.--~-----------------.--.~

110.0 -12-Apr-IO 17-Apr-IO 22-Apr-IO 27-Apr-IO 02-May-IO 07-May-1O 12-May-IO I7-MlIy-1 0 22-May-10

TIME

FIG. 4.7 GROUNDWATER LEVEL OBSERVATION

A PROJECT: Proposed Addi tions & Alterat ions & Upgrading of Nan Chiau Primary School at Anchorvale LinkMOH AND ASSOCIATES (5) - Soi/lnvestigation ServicesConsulting Engineers Prepared by: cc [Checked by: CYK [Date: 17-May-10

S1003 / Proposed Additions and Alterations and Upgrading of Nan Chiau Primary School Oil Lot


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1025W PT MK21 at Anchorvale Link - Soil Investigation Services(Voll ..Factual Report)

V. CONCLUSIONS AND RECOMMENDATIONS

On the basis of the field and laboratory investigation results, detailed geotechnical analysis havebeen made for the proposed project. Conclusions are drawn and recommendations are made as follows:

1. The subsoil encountered at the project site can be classified into the following six (6) layers:

Layer No. Average Thickness (m) Soil Description

1FILL

0.2 to 2.0 Loose to medium dense, Clayey SANDwith hardcores and medium stiff, SandyCLAY

2[OA:E]

[28.0 ]( Only found in BH-4 ) Very loose, Clayey SAND (N~ 10)

S1003 / Proposed Additions and Alterations and Upgrading of Nan Chiau Primary School on Lot


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1025W PT MK21 at Anchorvale Link - Soil Investigation Services(Vol 1Factual Report)

3. The results of chemical contents analysis on selected water and soil samples (Table 3.6) indicatesthat the sulphate content (expressed as S03) of water sample collected from water standpipe is0.52g!L The total sulphate content of the soil is found ranging from 0.16% to 0.20% (averagevalue of 0.18 0.02%). These range of sulphate content found in the water sample and soilsamples are classified as the Class 1 or 2, as per Table 10.5 of Singapore Standard CP4:2003 interms of degree of exposure to sulphate attack to the concrete substructures. pH values of soil isranging from 4.62 to 7.78 (average value of 6.5 1.7) and pH value of groundwater is 6.48.

Sl003 / Proposed Additions and Alterations and Upgrading of Nan Chiau Prim my School 011 Lot


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1025W PT MK21 at Anchorvale Link - Soil Investigation Services(Vol l : Factual Report)

VI. LIMITATIONS

This factual report on soil Investigation works has been prepared for Mis Singapore HokkienHuay Kuan to be used solely by their Consultants in the planning and design Proposed Additions andAlterations and Upgrading of Nan Chiau Primary School at Anchorvale Link. In performing ourprofessional services, we have used that degree of care and skill ordinarily exercised, under similarcircumstances by reputable geotechnical engineers. No other warranty, expressed or implied is made asto the professional advice included in this report.

The report has been developed based on the results of field investigation and laboratorytesting ofthe present study. Itshouldbe recognised that subsurfaceconditions can vary laterallyandwith depth at agiven site. If during construction, conditions are exposed that differ from those described within thisreport, those should be brought to the attention of MIs Moh and Associates (S) Pte Ltd to evaluatewhether reassessment of the recommendations contained in this report is necessary.

S1003 / Proposed Additions and Alterations and Upgrading of Nan Chiau Primary School on Lot


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1025W PT MK21 at Anchorvale Link - Soil Investigation Services(Voll : Factual Report)

REFERENCES

1. AMERICAN SOCIETY FOR TESTING AND MATERIALS (1992), "Annual Book of ASTMStandard".

2. BISHOP A.W. and HENKEL E.l. (1962), " The Measurement of Soil Properties in the TriaxialTests". Edward Arnold Ltd, London, 2nd edition.

3. BRITISH STANDARD INSTITUTION (1999), "Code of Practice for Site Investigation,BS5930: 1999".

4. BRITISH STANDARD INSTITUTION (1990), "Methods of Test for Soil for Civil EngineeringPurposes, BS 1377:1990".

5. DEFENCE SCIENCE & TECHNOLOGY AGENCY (2009), "Geology of Singapore 2nd Edition",


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Appendix ASoil Boring Logs


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LOCATION: Anchorvale Link STARTED: 15/04/10 METHOD ROTARY BOREHOLE NO.GROUND EL.: 112.547m COMPLETED: 21/04/10 FLUSHING WATER BH~1NORTHING: 41547.237m G.W.L.: 11i.807m INCLINATION VERTICAL SHEETEASTING: ~~47Q.4Z3m (03705710) 1 OF 2E (l) Q) "0 A NaturalWater ~c::JCore Recove ry , % ~ J:: c... 1-..;:! c SPT Blow Count Content(%) i=ROD,% c u g >EO f u ~ Q) Description (BIowsf30cm) o Total Unit WI.. kNlm'Q. OJ H Atteroerg Limits (%) E..,c o2 (l) Q) (l) \PI'II~~ l i m F i I L~""~ Umil} 20 60 % ~~0 e n z ...J 20 40 60 80 20 40 60 80 16 20 kNlm~

h Medium stiff, yellowish brown r ISandy CLAYI- \ IFill]I (RL 112.24m) O.3m1-2 Medium dense, light grey with yellowish ,~ !5,:44~ UD-1 brown Clayey SAND I < r o ." !~:~~~:8. : ( _ 4 m IOA:D] ~5-1 35 ~ I2Jl5m 5115120 I(RL 110.14m) 204m 1 \"- Dense, yellowish brown to light grey I ,4 and brown Clayey SAND 1 \ ~"."~ UD-2 IOA:C] 15,:260S'-~

11~S2-4.e>m- IRL 106.54m)-6 6.0mp $-3 ! 1 ~ S~

Hard, brown with traces of grey6 - 6 . 4 5 m Silly CLAY- [OA:C]p $-4 34 I c ! ~ ~ p " . '1-8 7.5-7.9>m 8113119l- I ,I- P 5-5 42 (RL 103.14m) 804m


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LOCATION: Anchorvale Link STARTED: 15/04/10 METHOD ROTARY BOREHOLE NO.GROUND EL.: 112.547m COMPLETED: 21/04/10 FLUSHING WATER BH~1NORTHING: 41547.237m G.W.L: 111.607m INCLINATION VERTICAL SHEETEASTING: 34470.473m {li37ll571lij 2 OF 2E ~ Q) "0 I ! J . Natural Water i c : : : J Core Recoyery, % , : . : " 'c. . f-.2 c SPT Blow Count Content (%) 1= RQD,% ~:!!.c Itl'"EO 0..(0 Ql Description o Tota l Un~wt, kN/m' E~-' OJ (Blows/30cm) H Atterberg Limits (%]. ro2 ( J ill .Q) CI) (l) (PtiJ~b:l~it1lillijid Ull1i~J 20 60 ;tm3 o : : : ~0 z _J 20 40 60 80 20 40 60 80 16 20


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STARTED: 22/04/10COMPLETED: 25/04/10

LOCATION: Anchorvale LinkGROUND EL : 112.591m

METHODFLUSHING

ROTARYWATER

NORTH ING: _----=4!...!1..:!5...!.:19o!.",.!80~2,,!,;mC!...,__EASTING: 34493.996m

G.W.L.: 111.351m INCLINATION VERTICAL(03/05/2010)

BOREHOLE NO.BH-2

E3

SHEET1 OF

c : : : : : J Core Recovery. %= ROD. %o Total Unit Wt.. kN/m'20 60 %16 20 kNfm3

< v 20. ,

t "

< D '01-.2 c0... ro < DU) > a rZ.J

< D"'5,.EOroZU)..c1 5 .


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LOCATION: Anchorvale Link STARTED: 22 /04 /10 METHOD ROTARY BOREHOLE NO.GROUND EL.: 112.591m COMPLETED: 25/04 /10 FLUSHING WATER BH-2NORTHING: 41519.802m G.w.L. : 111.351m INCLINATION VERTICAL SHEETEASTING: ~449~.996m (03/05/10) 2 OF 3E ~ Q) -0 .0. Natural Water 1 c : J Core Recover y . % ~ W~ Cl. f-.2 c SPTBlowCount Content(%) 1 i Z Z : 2 ROD , ,% romEO ~~ Q) Description (Blows/30c:m) o T ot al U ni l W I . k N lm3 E{tis.


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LOCATION: Anchorvale Link STARTED: 22 / 04 /10 METHOD ROTARY BOREHOLE NO.GROUND EL.: 112.591m COMPLETED: 25/04/10 FLUSHING WATER BH-2NORTHING: 41519.802m G.W.l. : 111.351m INCLINATION VERTICAL SHEETEASTING: 3449J:.9Sfim (0370571DJ 3 OF 3E Ul Ul '0 '" NaturalWater 1 c : : : : J Co re Recove r y. % t s: c.. 1-..2 c :: SPT BlowCount Content(%) 1 [ 2 2 2 RO D, 10 r o O ' >EO Il..ro (]) Description (Blows/3Ocm) o T o ta l U n it W t .. k N lm ' E~Q. OJ f-I A t te rb er g L im i ts (%)roZ (j' (]) Q) -(j) (ilJi:l!ie UmctJL~uidUrn!!) 20 60 % o::~0 a : Z __J 20 40 60 80 20 40 60 80 16 20 kNlm' 6

~Very hard, greenish brown and grey I

I- Silty CLAY I[OA:A] Ir42 (RL 70.S9m) 42.0m Ip S-17 1 1 3 i 4 . i i 5 . 5 Very dense, greenish grey 1 ~".2 1 < > "~2-42,~m Clayey SAND I- [OA:A] I-44 I- (RL 57.29m) Ip S-18 4S.3m I5 - I 5 . 3 \ l m 125153/47 Lnd of Boring46 III-r - 48 If- I

LOCATION: Anchorvale Link STARTED: 15/04 /10 METHOD ROTARY BOREHOLE NO.


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GROUND EL.: 112.34 COMPLETED: 20 /04 /10 FLUSHING WATER BH~3NORTHING: 41499.532m G.w.L. : 111.96 INCLINATION VERTICAL SHEETEASTING: 3444~.4;27m (03705/10) 1 OF 3E O J (j) '0 6. Natural Water c::::J Co re R e co v er y. % . > < : 0 >SPT Blow Count Content(%) [ZZj ROD, % ~~c.. I-..:! c: r o e >.!: EO 1 l . . ( I J O J Description (Blows/300m) o Tota l Un it Wt . . kNlm' E~Q. c oZ (f. 0) HA l te roe rg Um i !s (%) QJ .O J O J (PIJi~~Li rM./Liq~d LUn~11 20 60 % o::~f.) Z ...J0 20 40 60 80 20 40 60 80 16 20 kN/m 3

Bricks debris and hardcore with sand I rFill]- ,(RL 112.14m) 0.2mMedium dense, yellowish brown

-2 Clayey SAND . " . 0~ UD1 [OA:D] '"." Is..=l22Aro (RL109.94m) 204m!-1 34 ~ \ ,2.4-2._ 8115119- Dense, yellowish brown with light grey ) 1layey SAND-4 [OA:C] \ I" 1 ~ : ~ ~ i . OUD2 (RL10B .34m) 4.0m \ --1~.'f' 53 Very dense, light grey and brown2-4_5m 1712412 l l- Clayey SAND[OA:B]-6 P S-3 586-64 5m 1 00 61 32- I I(RL104.84m) 7.5m I IP S-4 38 Hard, light grey with yellowish brown I ,c'" 0'I"r-8 7_5-7.95m 9116 /22 and brown Silty CLAY IOA:C] 1 I- ] S5 31



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GROUND EL.: 112.34 COMPLETED: 20 /04 /10 FLUSHING WATER BH-3NORTHING: 41499.532m G.w.L. : 111.96 INCLINATION VERTICAL SHEETEASTING: 34449.437m (03/05/10) 2 OF 3E Q) Q) -0 A Natural Water I I : : : :J Co r e R e c ov e ry , % ~Ws: 0... 1-.2 c: SPT Blow Count Content(%) 1= RQD.% C I l ! l 'EO fu~ Q) Description o Total UnitWt..kN/m'1 5 . OJ (BlowsJ30cm) 1-1Atterberg Urnits(% ) E 'OroZ Q) Q) Q) (Pki~~ U.rnitJ Uo' Iw Urn,I) 20 60 k:tm' o : . r f0 e n Z _J 20 40 o 90 20 40 60 80 6 20 ~IDense, greenish grey Clayey SAND 1

I- (RL91.34m) 21.0mD 810 1 1 6 / ~ ~ Very dense, greenish grey to light grey2121.45111 and grey Clayey SAND I1-22 [OA:B]1 \- Very dense, greenish grey layer \I- at 33.0m \

1-24 ] 8-11 21~~43 I424.


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GROUNDEL.: 112.34 COMPLETED: 20/04/10 FLUSHING WATER BH-3NORTHING: 41499.532m G.W.L. : 111.96 INCLINATION VERTICAL SHEETEASTING: 3~442.437m (03/05710) 3 OF 3E C l l C l l "0 I : > . NaturalWater 1 c : : : : J Co re Recovery , % ~ W. . c : c.. 1-..:1 c SPT Blow Count Content(%) I C Z Z J ROD, % til'". . . . . E 0 a .. til


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GROUND EL.: 112.588m COMPLETED: 25/04/10 FLUSHING WATER BH4NORTHING: 41534.599m G.w.L. : 111.998m INCLINATION VERTICAL SHEETEASTING: 34433.13!9m (0310571 O ~ 1 OF 3E O J O J "0 b. Na tu r al Wa te r I e : : ! Co re Recove r y. % ~ c.. 1-.2 c SPTBlow Count Content(%) I c z : z : ; d RQD~% c o o >. . . . . EO Q_(tI Q) Description (Blows/30cm) t-i A t te rb er g Um il s (%) o Tolal Un it W t .. kN/m' E~c, (tIZ U OJ ill -Q) Q) {P~'Io~OL.imit/llq~cj Li.ml) 20 60 ;tm' o:~c U) Z _ 40 00 30 ~o 40 (0 300 6 ~O k

Dark brown and grey, Clayey SANDmixed with hardcorest- [Fill]

1-2 (RL110.58m) 2.0m IVery loose, reddish brown, yellow and I 1 ~ : ~ ~ 9 ~ 5~ un-i pink Clayey SAND f : > " ' . c I'"t- 2 . 5 - 3 m [Fill]5-1 03-3._ 010/0 - probably backfill ing Clayey SANDt-4 over previous sand quarry~ UD-Or- '~2m 1

4.7525tn 11 1

t-6 ~uo~6.5m5-3 4I- 6..... 90m 11V2

-8

- 1 : 1 . " . 2 .O S

LOCATION: Anchorvale Link STARTED: 21/04/10 METHOD ROTARY BOREHOLE NO.


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GROUND El.: i12.588m COMPLETED: 25/04/10 FLUSHING WATER BH-4NORTHING: 4i534.599m G.W.l. : iii.998m INCLINATION VERTICAL SHEETEASTING: J4:133.139m ( D 3 7 D 5 7 i0) 2 OF 3E Q) Q) "0 I>. Natural Water 1 c : : : : J Co re Recove r y. % t 0.. 1-.2 c :: SPTBlowCount Content(%) 1 t z Z 2 ROD , % r n g >.c E 0 C D Description. c..ro (Slows/3Ocm) f-I A t le rb er g Um it s (%) < > T o ta l U n it W I . . k N lm ' E"roZ W> Cl < ! l Q) C D {PLuk UmltI U q u l c : : E lima) 20 60 % rY~0 C/) Z . . . . J 20 40 60 80 20 40 60 80 16 20 kN lm3 " '-

Very loose, reddish brown, yellow and I Ipink Clayey Coarse SAND I I- [Fill]] S-8 4 ~ I I12U5m 11212-22 I I

probably backfilling Clayey SAND I Iover previous sand quarry I II I If-24 Io 8-9 024-2H5m 01010r - -

f-26r- 0 8-10 3 ~72745m 11112 \-28 \- \\



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GROUND EL.: 112.588m COMPLETED: 25104/10 FLUSHING WATER BH4NORTHING: 41534.599m G.w.L. : 111.998m INCLINATION VERTICAL SHEETEASTING: 34433.139m (03/05710) 3 OF 3E (J) O J "0 .:. NaturalWater 1 c : : : J CoreRecovery.% ~ 0... f-.2 c: SPT Blow Count Content(%) 1= ROD. %.c EO ~~ (J) Description (Blows/30cm) o TolalUnilWt.. kNlm' { I l l & 'Q. 0) HAtlerbergLimits%) E-oroZ w .(J) (J) ( P I. aSM t im i t/ U i: I ;~ d l im i ~ 1 20 60 k~lm~ tr::~0 (/) Z ....J 20 40 60 80 20 40 60 80 16 20

Very dense, greenish greyClayey SANDI- [OA:A] If-42 P S-15 10017 I42-12.12", 25'100 I Il- II If-44 IIf- ille.ea S-16 1 1 2 ~ ~ ~ (j (.,.45- !5 .


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GROUND EL.: 112.397m COMPLETED: 29/04 /10 FLUSHING WATER BH-5NORTHING: 41516.431m G.w.L. : 111.537m INCLINATION VERTICAL SHEETEASTING: 344Qr2.223m (03/05/10) 1 OF 3E ID Q) U '" Natural Water 1= CoreRecovery,% ~ Ci. . f-.2 c SPT Blow Count Content(%) 1= RQD,% c o O ' >s: E 0 g,~ Q) Description (Blows/3Ocm) o Total Uni t Wt. , kNlm' E~li roZ OJ H Atterberg Limits (%) Q) -O J C 1 l (P1;u~ IJ.mfll Liquid Umll) 20 60 % o::~0 w Z _J 20 40 60 80 20 40 60 80 16 20 kNlm' e

Loose, dark grey and brown Clayey t ISAND with hardcores II- [Fill]I(RL 111.99m) DAm/ I

1-2 Dense, yellowish brown Clayey SAND I L l . ' I . 15,:166~ UO-1 [OA:D] I,I'" 1 : ~ ~ 5-2Am8-1 34 I,4~2.85m 9116118t- I

f-4 (RL 10B.39m) 4.0m ~~~ U~2 Very stiff to hard, yellowish brown ~ , o ., 15':2145 - : 2 " 32 Silty CLAY with traces of sandU5m 9115117f- [OA:D],_ I l o, , ~,."~ UO-36 ' ! j " ' 27

6.35-68m 8/1:l114 \- IRL 104.89m) 7.5mJ 8-4 1~~71 Dense, light grey to l ight yellowish ,8 1_5-H5m brown and grey Clayey SAND[OA:C]- ] 8-5 - Medium dense Clayey SAND at ~



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GROUND EL.: 112.397m COMPLETED: 29/04/10 FLUSHING WATER BH-5NORTHING: 41516.431 m G.W.L. : 111.537m INCLINATION VERTICAL SHEETEASTING: 344QQ~223m { 0 3 7 0 5 7 1 0 ) 2 OF 3E Q) (]) '0 A NaturalWater 1 c : : : J Co re Recove r y . % t ..c 0.. 1-.2 c SPT Blow Count Content(%) 1 = ROD. % r o D >E 0 ~~ Q) Description (Blows/30cm) o Tolal Uni t wi, kNfm' E~Q. (1]Z OJ J-i Atlerberg Umi ls (%) Ql -(]) Q) (P!atticUmrc/UquldLlmltl 20 60 % c r : & :0 o: Z ...J 20 40 so 80 20 40 60 80 6 !O ~Nfm; efI Dense, light grey Clayey SAND~[>'91h9~) 21_0m- 'I8-10 1 2 1 ~ 1 3 a Very dense, light grey with yellowish21-2\.4Sm brown to greenish grey Clayey SAND

f-22 [OA:B]1

I-

r24 p 8-11 I z J ; / 3 34-NASmI-

f-26II

I- D 8-12 75 I1-2145m 12=40-28 I II-



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GROUND EL.: 112.397m COMPLETED: 29/04 /10 FLUSHING WATER BH~SNORTHING: 41516.431m G.w.L. : 111.537m INCLINATION VERTICAL SHEETEASTING: J44Qf2223m (O3/05710) 3 OF 3E . Natural Water h : : : : : : : : : : : J Core Recovery, % t:.c A.. J-..:! c SPT Blow Count Content (%) [ f Z Z J ROD, ~/(I c o o >. . . . EO C L C I l 4>4S .34m 1 2 9 5 9 1 4 1-46 I

I- II-48 P $-19 ~ 2 ~ ~ ~. (RL64.0Sm) 4S.31m,.,,.,4a-4&31m Lnd of Boring


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Appendix BSetting-out Survey of Boreholes


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' ~ - - - - ~ ~ - - - ~ ~ _ _ '= - t , , - a ; ~' E . , _ ? t- % _ _ :~ _ _ !'_ .=------t.1>ANCHORVALE LINK

r=I '.\

Legend

,,:~0

,\ ,i;IIIS A s- b u ll b or eh o e ! oc ot Eo n

Nole :i. Hor izono l d atum is based onSW21 ccordnc te sys tem.

2. Reduced Leves ore based on Mean Sea Leve . .; .OO.DOOm

3. Coerereo tes shown are in Meres.

4 Topog raphca d roOing i s adopted f rom d rownq No: WEfT19131 DTOPOprovided by client

WISESCAN E NG IN E ER ING S ERV IC E S P T E L T D2 K A KI B U K IT P L AC ELEVEL 3 S INGAPORE 416180

TEL : 6 84 1 0 8 BO FAX: 6 84 1 0 7 70

CONTRACTOR : PROJEC T T I T L E :P R OP O SE D A D DI T IO N S a ALTERATIONS a U PG RA DI NG O F

J--,-,-~o-=,""N,-A_N_C_H_IA_U_P_R_IM_A_R_Y_S_C_HO_O_L_A.....:T_A_N_C_H_OR_V_A_L_E_L.....:IN_K ---! S I NG A POR E H OK KI EN H U AY K U ANJ O B T I T LE :A S- BU IL T B OR EH OL E L OC AT IO N P LA N A T A NC HO RV AL E L I N K

J OB N O.17646A -2545110

REG I STERED SURVEYOR S CA LE I 1000

. . . ~ ~D

SURVEYE D B Y S04D R AW N B Y TS

C H UA K E NG G U AN C H EC KE D B Y TTREG tS t tR n l - S l. RV E 'l ' OR S lH - E iU ' ORE

M O H A N D A S S OC IA T ES ( S) P T E L T OCONSUL T ING ENG IN E E RS1- :- :-:=-:- -:=-- :;- :-:_- -==- __ - ' 0 / L 7 . J ! . : 0 5 1 , j . 1 . < ! . . 015001 B EA CH R OA D # 04 -0 9 G OL DE N M IL E C OM PL EXT EL : 6 29 5 0 61 1 FAX: 6 29 8 7 65 3

Z 7 . 0 4 . I O

0 1 . 0 5 . 1 0

CL IENT:

REV.DWG NO : WE $ tB H / 264 J : < i

16 soil investigation report by moh associates (s) pte ltd

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