Earth Control Measures For City Square MallEarth Control Measures For City Square Malla t S e r a n g o o n R o a d / K i t c h e n e r R o a d

1.1. Project OutlineProject Outline

2.2. Risks Assessment & Impact to Risks Assessment & Impact to Surrounding NeighborhoodSurrounding Neighborhood

3.3. ECM Criteria & ConsiderationsECM Criteria & Considerations

4.4. Earth Control MeasuresEarth Control Measures

5.5. Silt Water Treatment & Recycling Silt Water Treatment & Recycling SystemSystem

6.6. Construction SequenceConstruction Sequence

11 Project OutlineProject Outline1.1 Site Location / Overall Site Plan

Project OutlineProject Outline

S E

R A

N G

O O

N

R

O A

D

K I T C H E N E R R O A D

9 STOREYTOWER

6 STOREYPODIUM

SUNKEN PLAZA

Site :

Phase 1Proposed Erection of a 9th Storey Development comprising a Retail Podium from the 1st to 5th Storey, an Annex Tower from the 6th to 9th Storey and 4 level Basement consisting 2 level of Basement Carpark, 2 level of Basement Retail and other Ancillary Facilities at Serangoon Area Bounded by Serangoon Road, Kitchener and Kitchener Link

Phase 2Proposed to Develop an Open Space (Urban Park) including a Sunken Plaza and Outdoor Refreshment Area w ithin the above mentioned compound

Owner : City Developments Ltd

Architect : Ong & Ong Architect Pte Ltd

Retail Consultant : Lend Lease Asia Holding Pte Ltd

Quantity Surveyors: Davis Langdon& Seah Singapore Pte Ltd

M&E Engineer : Parsons Brinckerhoff

Structural Engineer Meinhardt (Singapore) Pte Ltd

Design & Development Contractor: Kajima Overseas Asia Pte Ltd

QECP: Tenw it Engineering Consultants (Dr George Zhou TG)

Contract Period 33.5 Months

GFA 65,642 m2

Site Area 14,620 m2

Site Location Overall Site PlanSite Location Overall Site Plan

Located at Central / Eastern Part of Singapore (Serangoon Road & Kitchener Road)

SITE

Kitchener Road

Serangoon Road

City Square Mall site discharges to Marina Water Reservoir Catchment Zone

22 Risks Assessment & Impact to Surrounding Risks Assessment & Impact to Surrounding NeighborhoodNeighborhood

Risk Assessment & Impact to Surrounding NeighborhoodRisk Assessment & Impact to Surrounding Neighborhood

Cover Walkway Along Kitchener Road

Cover Walkway Along Kitchener Road

Open Field Front of MRT Underpass

Open Field Front of MRT Underpass

Internal View Of Farrer Park MRT

Internal View Of Farrer Park MRT

Another View from Car Park Facing Upper Serangoon Road

Another View from Car Park Facing Upper Serangoon Road

Temporary car Park Provision For Show Flat

Temporary car Park Provision For Show Flat

Typical Shop House Along Kitchener Road

Typical Shop House Along Kitchener Road

Existing Commercial Building at Kitchener Road

Existing Commercial Building at Kitchener Road

Farrer Park MRTFarrer Park MRT

GA

TE

1

GATE 2

GATE 3

Assessed Risks Flooding & Silt Overflow to Surrounding Neighborhood (Farrer MRT Entrance 8, Serangoon Road, Kitchener Road, New Park Hotel, Shop Houses)

Risk Assessment & Impact to Surrounding NeighborhoodRisk Assessment & Impact to Surrounding Neighborhood

Aerial View of Site Showing Surrounding NeighborsAerial View of Site Showing Surrounding Neighbors

OUTLINE OF CONSTRUCTION SITE HOARDING

OUTLINE OF CONSTRUCTION SITE HOARDING

OUTLINE OF BASEMENT DIAPHRAGM WALL

OUTLINE OF BASEMENT DIAPHRAGM WALL

KITCHENER ROAD

KITCHENER ROAD

SERA

NGOO

N RO

AD

SERA

NGOO

N RO

AD

NEIGHBORING CONSTRUCTION SITE CITY RESIDENCES (By

Others)

NEIGHBORING CONSTRUCTION SITE CITY RESIDENCES (By

Others)

Site officeSite office

Gate 2 Gate 2

Gate 3Gate 3

MRT Entrance

MRT Entrance

33 ECM Criteria & ConsiderationsECM Criteria & Considerations

ECM Criteria and ConsiderationsECM Criteria and ConsiderationsEarth Control Measures or ECM- is a system provided in place and maintained at construction sites or

other places with earthworks or other construction activities to prevent earth, silt, sand or any other material from the work site being washed into the drains and adjacent premises.

includes silt-control facilities such as temporary lined perimeter cut-off drains, lined silt-trapping devices, silt fences, turfing, wash-bays and perimeter bunds provided and maintained to prevent earth, silt, sand or any other material from the work site being washed into the drains and adjacent premises. The silt fences shall be provided beside and along the lined perimeter cut-off drains.

-

ll earth surfaces or slopes adjacent to any drain shall be close turfed or paved and all other bare earth surfaces shall be turfed to control soil erosion.

- discharge into the storm water drainage system shall not contain Total Suspended Solids in concentrations greater than 50 milligrams per litre of the discharge.

Design Criteria of ECM The ECM shall be designed to cope with a minimum design rainfall intensity of a

return period of 1 in 2 years storm.

If a site has suitably sized storage pond / tank and treatment system, the rainfall to be considered is equivalent to 60 mm for every square metre of the construction site.

As an illustration, for a half-hectare (5,000 sq m) site, the storage pond / tank should contain a minimum of 300 cu m and the treatment system should have a minimum capacity of 30 cu m/hr, as outlined in Section D, Para 5(B) of this training kit.

To reduce the storage and treatment capacity, a site can reduce the erodible or bare surface by adopting measures as outlined in Section D, Para 5(A).

Calculations:

Surface Area of Basement Exposed to Weather = 12,500 m2

ECM Criteria and ConsiderationsECM Criteria and Considerations

Calculations:

4 Earth Control Measures4 Earth Control Measures

EXT G MAN HOLE

300mm WIDES ILT CUT-OFF DRA IN

GA TE 2

GATE 3

GATE 1

4

5

6

7

8

EXISTING HOARDING TOBE MAINTAINED

STORA GE TANK FORTREATED WA TER

S ILT WA TER HOLDING TA NK FROM MONTH - 9 TO MONTH - 22

A B

SILT WA TER HOLDING PITCA PAC ITY= 80m3 x 2

LOCATION OF SILTWATERPIT FROM MONTH-0 TO MONTH-4

A B

LOCAT ION OF SILTWATERPIT FROM MONTH-5 TO MONTH-8

TO SHIFT SILTWATER HOLDING PITFROM MONTH-5

XX

400 H IGH HOLLOW BLOCKWA LL @ NE IGHB ORINGCONSTRUCTION SITE

Z1

PORTION OF EX ISTINGHOARD ING TO B E REMOVEDUPON A PPROVA L OF T.O.L

V

IL=102.530

102.830

102.830

102.870

103.670

102.890

103.270

103.050

102.920

102.840

102.970

103.020 103.900

102.670

102.670

102.700

102.290

SUMMITIL=101.990

IL=102.384S ILTWATER TREATMENTPLANT

BARE EARTH SURFACE TO BECOVERED WITH CANVASS SHEETIF THERE IS NO ON-GOING ACTIVITY

NEW HOA RDING

NEW HOA RD ING TYPE-1

HOA RD ING ALONG TOL LAND

WA

TE

R P

IPE

/ HO

SE

TO

TRA

NS

FER

SIL

TY W

ATE

R

4.0 x 4.0 1.5(D)S ILTY WA TER SUMP

4.0 x 4.0 1.5(D)S ILTY WA TER SUMP

TEMPORA RY SILT FENCETHIS SILTY WATER CONTROL SYSTEM

TO BE SHIFTED TO FOLLOW THEDIAPHRAM WALL SEQUENCE

S ILT TRAP1m X 1m X 1m (D)

THIS SILTY WATER CONTROL SYSTEM TO BE SHIFTED TO FOLLOW THEDIAPHRAM WALL SEQUENCE

IL=101.668

SUMMITIL=103.200

INTERMEDIA TE SILT TRA P3Mx3Mx2M (D)

IL=102.530

IL=101.967

300m m WIDES ILT CUT-OFF DRA IN

SUMMITIL=102.370IL=102.093

Z2

Wet Sep 40 Silt Treatment Plant

Silt Fence & Cut-off Drain

Earth Control Measures Earth Control Measures -- Site LayoutSite Layout

400 high Hollow Block Wall around MRT structure

Interim Silt Water Holding Pit

Silt Traps

2 Nos Washing Bays

Earth Control Measures Earth Control Measures -- Details of Silt Control MeasuresDetails of Silt Control Measures

PLAN VIEW OF SILT WATER TREATMENT SYSTEM PLANT

SECTIONAL ELEVATION VIEW

Earth Control Measures Earth Control Measures -- Details of Silt Control MeasuresDetails of Silt Control Measures

PERIMETER CUT-OFF DRAIN& SILT FENCE DETAIL

DETAIL OF INTERMEDIATESILT TRAP

S E C T I O N X - X

DETAILS OF SILT WATER HOLDING PIT

To prevent exposure of the earth to rainwater and silt being washed into drains, areas w ithout activities on site shall be covered w ith canvass sheets or earth control blanket whichever is applicable. Existing grass covering, vegetation, hardcore, lean concrete or mill waste on the site areas w ithout activity shall not be removed.

Earth Control Measures Earth Control Measures -- Other Silt Preventive MeasuresOther Silt Preventive Measures

Extra Precautionary Measures for the Control of Slurry & Silt duExtra Precautionary Measures for the Control of Slurry & Silt during Diaphragm Wall Worksring Diaphragm Wall Works

4.0 x 4.0 1.5(D)SILTY WATER SUMP

4.0 x 4.0 1.5(D)SILTY WATER SUMP

TEMPORARY SILT FENCE

BOUNDARY / HOARDING L INE

WORK ING AREA

WATER PIPE/ HOSE TOTRANSFER SILTY WATER

DIAPHRAGM WALL

TEMPORARY SILT FENCE ENCLOSURE

Earth Control Measures Earth Control Measures -- Diaphragm Wall WorksDiaphragm Wall Works

To reduce risk of bentonite being washed away into the public drains, a bentoniterecycling plant w ill be installed on site.

Earth Control Measures Earth Control Measures -- BentoniteBentonite Control for Diaphragm Wall & Bored Piling Control for Diaphragm Wall & Bored Piling WorksWorks

To reduce risk of silt being washed into drains and dust from being blown about the site, all slurry are to be gathered continuously and disposed to approved dumping grounds

Earth Control Measures Earth Control Measures -- Slurry & Dust ControlSlurry & Dust Control

5 Silt Water Treatment & Recycling System5 Silt Water Treatment & Recycling System

! " #

$ % $

&

& " ( ) #

Ground Water 10 m3/hr

Construction Water < 1 m3/day

* + , - ./ 0

Silt Water Treatment & Recycling System Silt Water Treatment & Recycling System DiagrammeDiagramme

Silt Water Treatment Plant Incoming silt water for treatment

Silt water mixed with chemical and flow into the Impinging Stream Reactor

Clean water overflowing to Universal Processing Chamber

De-sludging into separate container to be periodically cleared

From site From ISR DischargingTreated water stored at storage tank for site usage.

Silt Water Treatment & Recycling SystemSilt Water Treatment & Recycling System

Treated water containstotal suspended solidsof < 50 mg/l (or better)

Treated water is stored for other uses (reduce/reuse/recycle)

No fines from NEA/PUB

We will measure the total suspended solids using colorimeter (pic) in addition to the periodical assessment by an accredited lab.

Silt Water Treatment & Recycling SystemSilt Water Treatment & Recycling System

6 Construction Sequence6 Construction Sequence

Construction SequenceConstruction Sequence

The whole structure w ill be constructed in a top-down sequence. As such, the bare earth surface at ground level w ill not be exposed to weather for a long period of time. By the 14th month, the basement structure w ill be gradually covered by a permanent slab at ground level which w ill also serve as a working and access platform. Hence, the risk of the bare earth surface being exposed to rainfall is minimized.

0 to Month 60 to Month 6 Month 7 to Month 13Month 7 to Month 13 Month 14 onwards until Month 14 onwards until completioncompletion