sale of agricultural land for farm use st35a …

Conditions and Requirements of Relevant Authorities/ Public Utility Licensees 1

SALE OF AGRICULTURAL LAND FOR FARM USE

ST35A

CONDITIONS AND REQUIREMENTS OF RELEVANT AUTHORITIES / PUBLIC UTILITY

LICENSEES (FOR TENDERERS’ INFORMATION ONLY)

CONTENTS PAGE

1 DEFINITION 2

2 GENERAL CONDITIONS AND REQUIREMENTS 2

3 NATIONAL ENVIRONMENT AGENCY (NEA) 4

4 POWERGAS 6

5 SP POWERGRID (SPPG) 7

6 MINISTRY OF DEFENCE (MINDEF) 9

7 SINGAPORE CIVIL DEFENCE FORCE (SCDF) 9

8 LAND TRANSPORT AUTHORITY (LTA) 10

9 NATIONAL PARKS BOARD (NParks) 11

10 PUBLIC UTILITIES BOARD (PUB) 13

A. DRAINAGE

B. USED WATER

C. WATER SUPPLY

11 COMPLIANCE WITH TECHNICAL CONDITIONS OF RELEVANT 22

AUTHORITIES

A. ANNEX A

B. ANNEX B

C. ANNEX C

D. ANNEX D

E. ANNEX E

F. ANNEX F

G. ANNEX F-1

H. ANNEX F-2

I. ANNEX F-3


SALE OF AGRICULTURAL LAND FOR FARM USE

(ST35A)

CONDITIONS AND REQUIREMENTS OF RELEVANT AUTHORITIES / PUBLIC UTILITY

LICENSEES (FOR TENDERERS’ INFORMATION ONLY)

1.0 DEFINITION

1.1 The Singapore Food Agency (“SFA”), is inviting offers for the lease of Land Parcel(s)

ST35A at Sungei Tengah. The lease of the Land parcel(s) is subject to the Conditions

of Tender, the Technical Conditions of Tender and the Lease for the Land parcel(s)

issued by SFA in the said Invitation to Tender.

2.0 GENERAL CONDITIONS AND REQUIREMENTS

2.1 The Successful Tenderer for the Land Parcel(s) is required under the said Conditions

of Tender to ascertain the exact and detailed conditions and requirements of all

relevant Competent Authorities/ Public Utility Licensees in respect of the proposed

Development thereon and shall at his own cost and expense observe and comply

with the same.

2.2 Without affecting the generality of paragraph 2.1 above and without prejudice to the

obligations of the Successful Tenderer as set out therein, the contents herein are

provided for the information of the tenderers only. Whilst every care and attention has

been taken in the compilation and preparation hereof, SFA does not warrant that the

contents herein represent all the conditions and requirements of the relevant

Competent Authorities/ Public Utility Licensees in respect of the proposed

development on the Land Parcel(s) or that they are free from errors or omissions

whatsoever. The contents herein are subject to changes by the relevant Competent

Authorities/ Public Utility Licensees concerned.

2.3 A summary of the initial services requirements of the relevant Competent Authorities/

Public Utility Licensees is set out herein. It serves only as an indication of the possible

work involved with regards to services, and is by no means exhaustive or final.

2.4 The Successful Tenderer shall ensure that the following requirements are complied

with: -

A. to consult and liaise directly with the relevant Competent Authorities/ Public Utility

Licensees regarding the actual locations of all service mains within the Land

Parcel(s) and on the requirements and conditions for services diversion and

provision prior to the commencement of site work. All necessary precautions shall

be taken by the Successful Tenderer to safeguard the service mains before they

are diverted.


B. to engage his own licensed Cable Detection Worker (CDW)/ licensed

Telecommunication Cable Detection Worker (TCDW) to carry out cable detection

and if necessary to carry out trial trenches to locate any manholes and cable routes

prior to the commencement of site work. The Successful Tenderer shall bear the

cost of any diversion work.

C. to ensure that all service mains that do not need to be diverted are identified and

provided with protection, if necessary, during the construction stage of the

proposed development. The cost of repairs to any damaged service main as a

result of work carried out by the Successful Tenderer shall be borne by the

Successful Tenderer.

D. to ensure that the relevant Competent Authorities/ Public Utility Licensees are

allowed free and unconditional access at all times to services that are required to

remain within the Land Parcel(s) for the purpose of installation, maintenance,

repair and improvement works and all other work and activities incidental thereto.

E. to make his own arrangements with the relevant Competent Authorities/ Public

Utility Licensees and pay for the costs of any diversion and/ or "Capping off" of

existing services, provision of service mains and connection fees if any, in

connection with the proposed development.

F. to provide all the internal distribution for water, electricity, drainage and sanitary

discharge for the proposed development.

G. to liaise with all the relevant Competent Authorities/ Public Utility Licensees on

upgrading the road reserves abutting the Land parcel(s) to ensure that the

necessary roadside drains, sidetable, kerb, etc are carried out in accordance with

the latest Road Reserve requirements.

2.5 The Successful Tenderer shall note that there may be sub-structures e.g. footings,

piles, tree roots, etc. and other obstructions in the ground. The Successful Tenderer

shall at his own cost and expense carry out his own site verification of these sub-

structures and other obstructions, and ascertain its effect on the proposed

development.

2.6 In general, no structure shall be sited close to or over existing/ proposed services.

The Successful Tenderer shall comply with all the necessary requirements as

stipulated by the relevant Competent Authorities/ Public Utility Licensees.

2.7 The Successful Tenderer shall seek all relevant agencies’ approval on the layout plan.


3.0 NATIONAL ENVIRONMENT AGENCY (NEA)

3.1 General

3.1.1 Sewage and used water from the proposed farm developments shall be discharged

into the public sewer.

3.1.2 If the proposed farming activities would include the use of pesticides, only pesticides

that are registered with NEA and SFA shall be used. All pesticides used for farming

activities shall be stored within buildings or sheltered area equipped with leakage or

spillage containment facilities. Their dosage will also have to be controlled so that it

will not cause any nuisance problem to people in the vicinity or contamination problem

to the surface run-off during raining.

3.1.3 The emissions of air pollutants shall comply with the prevailing emission limits for air

impurities as stipulated in the Environmental Protection and Management (Air

Impurities) Regulations. For air impurities with no prescribed emission standards, the

best practical means shall be adopted to minimize air pollution and odour nuisance.

3.1.4 Off-road diesel engines used in the proposed farm developments are to comply with

the emission and other requirements as stated in the Environmental Protection and

Management (Off-Road Diesel Engine Emissions) Regulations. Off-road diesel

engines are any equipment or machinery with diesel engines as the main or auxiliary

prime mover and not registered with the Land Transport Authority (LTA) for use on

public roads. Examples include construction equipment such as cranes, excavators,

forklifts and power generators.

3.1.5 The noise levels measured at the boundary of the proposed farm developments shall

comply with the noise limits stipulated in the Environmental Protection and

Management (Boundary Noise Limits for Factory Premises) Regulations.

3.1.6 Refuse and solid wastes from the proposed farm developments, including the sludge

generated from treatment of wastewater, shall be collected and kept in a proper

holding area before disposal by a licensed general waste collector. The Successful

Tenderer are reminded that refuse or solid wastes are not allowed to be disposed by

throwing them into any drain, burying them on-site or using open burning method.

3.1.7 The proposed farm developments shall comply with all the applicable requirements

and provisions of the Singapore Standard on Code of Practice for Pollution Control

(i.e. SS593:2013), the Code of Practice on Environmental Health, the Code of

Practice for the Control of Legionella Bacteria in Cooling Towers, the Guidelines on

Boundary Noise Limits for Air-Conditioning and Mechanical Ventilation Systems in

Non-Industrial Buildings, the Environmental Protection and Management Act, the

Environmental Public Health Act, the Energy Conservation Act, the Radiation

Protection Act and their Regulations.

3.1.8 Under the Environmental Protection and Management (Control of Noise at

Construction Sites) Regulations, construction sites within 150 m of residential estate


need to comply with more stringent noise limits at construction stage especially during

night time hours. Hence, the Successful Tenderer’s appointed QP shall implement

noise control measures during the construction period to ensure that the noise

emission levels from the building and construction activities are within noise limits and

would not cause nuisance to any nearby residents. In addition, the proposed

development is not allowed to carry out construction activities from 10pm on Saturday

and eve of public holiday to 7 am on the following Monday and the day after the public

holiday respectively.

3.1.9 The subject site is located in close proximity to the Tengah Airbase and hence has a

relative high ambient noise level attributed to the aircraft operations. If any uses or

activities in the proposed farm developments are noise sensitive, the Successful

Tenderer is advised to assess the noise impact and incorporate mitigation measures

in the planning, design, building, construction, operation and maintenance of the

proposed farm developments so as to mitigate the noise impact.

3.2 Particular Requirements

3.2.1 ST35A is located within a water catchment area, where rainwater and surface runoff

are collected in the downstream reservoir for treatment to produce drinking water.

The proposed developments shall not cause pollution directly or indirectly to our water

resources. Activity that could cause serious contamination problem to our water

resources shall not be carried out.

3.2.2 Technical details of the proposed air pollution control equipment, odour abatement

facility and fuel burning equipment (e.g. boilers, heaters and ovens, etc.) & chimney

for flue gas discharge shall be submitted to NEA(DCLD) for clearance before

installation. Thereafter, they shall be duly installed and ready for use before the

proposed development is allowed to commence operations.

3.2.3 The Successful Tenderer shall apply for a Written Permission to discharge trade

effluent into a watercourse under the Environmental Management and Protection

(Trade Effluent) Regulations, where applicable. The Written Permission could be

granted when all the pollution control requirements have been complied with.

3.2.4 The Successful Tenderer shall adopt and implement the Best Management Practices (BMPs) at the proposed farm to minimise and prevent contamination risk to reservoir, if required by PUB.

4.0 POWERGAS

4.1 General

4.1.1 The Successful Tenderer shall liaise with the Licensed Gas Retailers authorised

under the Gas Act (Chapter 116A) on the requirements for gas supply to the Land

Parcel.



4.2.1 There are existing/ new gas transmission and distribution pipelines within the Land

Parcel and along the eastern boundary of the Land Parcel.

4.2.2 The Successful Tenderer is to comply with SPPG requirements of “Requirement for

Distribution Gas Mains Diversion Works” (ANNEX A), "Notes For Working Near

PowerGas Gas Transmission Pipeline" (ANNEX B) and “Notes For Working Near

Powergas Medium Pressure Pipeline” (ANNEX C) and pre-consult PowerGas on the

detailed development proposal.

4.2.3 The Successful Tenderer shall ensure that no permanent structures are designed and

constructed above the existing gas pipelines. The Successful Tenderer shall consult

PowerGas when working near the gas pipelines.

4.2.4 The Successful Tenderer shall at his own cost and expense carry out trial trench /

holes to determine the exact alignment and levels of any identified gas main during

the design stage and ascertain whether they will be affected by the development

works. If affected, the Successful Tenderer shall liaise with the Gas Transporter to

request for diversion.

4.2.5 As there are existing gas pipelines running along the eastern boundary of the land

parcel, the Successful Tenderer should also consult PowerGas on their detailed

boundary wall / fence proposal.

4.2.6 The Successful Tenderer shall provide a suitable diversion corridor and the proposed

corridor for the gas mains diversion works must be made available without any

obstructions. The Successful Tenderer shall contact [email protected] for

diversion consultation if the gas mains are affected and bear the necessary diversion

cost.

4.2.7 For further enquiries pertaining to the existing gas transmission pipelines, please

email [email protected].

4.2.8 For further enquiries pertaining to the existing gas distribution pipelines, please email

to [email protected].

4.2.9 Existing gas plan(s) can be purchased on request from:

Mapping & Earthworks Administration Section

Pasir Panjang District Office

25 Pasir Panjang Road

Singapore 117536

Tel: 6916 5022

Email: [email protected]

mailto:[email protected]




5.0 SP POWERGRID (SPPG)

5.1 General

5.1.1 The Successful Tenderer shall liaise with the Transmission Licensee authorised

under the Electricity Act for the electricity supply and any other electrical provisions

required for the purpose of and in connection with the proposed development.

5.1.2 The Successful Tenderer shall purchase cable plans from SP PowerGrid and engage

a Licensed Cable Detection Worker to carry out detection for any underground

electricity cables within the Land Parcel. For more information on the protection and

diversion to the underground electricity cables, the Successful Tenderer can refer to

https://www.spgroup.com.sg/what-we-do/electricity-and-gas under the heading

“Earthworks”. If the existing underground electricity cables are affected by the new

development, the cost of diverting the electricity cables shall be borne by the

requestor.

5.1.3 The Successful Tenderer shall provide electrical substation(s) within the Land Parcel

that shall meet the technical requirements specified by the Transmission Licensee

authorised under the prevailing Electricity Act for electrical supplies to the

development.


5.2.1 Based on the information provided by SP PowerGrid Ltd (SPPG), there are existing

underground electricity cables in the vicinity of the Land Parcel. If the existing

underground electricity cables are affected by the new development, the cost of

diverting the electricity cables shall be borne by the requestor.

5.2.2 The Successful Tenderer shall engage the services of licensed cable detection

workers to carry out the cable detection work prior to the commencement of

earthworks. All necessary precautionary measures must be taken to prevent

damaging SPPG’s cables at the work site.

5.2.3 The Successful Tenderer can contact Earthworks Surveillance and Patrolling

Section’s Mr Chen Jianhong, Senior Engineer at Tel no. 6916 5116 regarding cable

damage preventive measures. The Successful Tenderer are required to submit

notices to SP PowerGrid at least 7 days prior to earthworks (including trial trenches)

in the vicinity of high voltage electricity cables under the provisions of the Electricity

Act.

5.2.4 The Successful Tenderer are advised to acquire a set of drawings for the electricity

cables around the proposed work area. For further details on cable plan requests,

please contact Mapping & Earthworks Administration Section at Tel No. 6916 5022.

https://www.spgroup.com.sg/what-we-do/electricity-and-gas


5.2.5 For proposed earthworks which are likely to affect the cables and need cable

diversion/protection/suspension etc, after the cable detection work is done, the

Successful Tenderer can request for diversion via our SP e-Business Portal located

at www.spgroup.com.sg, under the heading “Electricity & Gas” or contact the

following officers:

A. For 22 kV and below cables, please contact Mr Chua Lian Shun, Senior Engineer

of Distribution Network North Section at Tel No. 6916 6994 or email:

[email protected]

B. For 66 kV cables, please contact Mr Richard Ngo, Principal Engineer of Regional

Network West 66kV Section at Tel No. 6916 5490 or email:

[email protected]

C. For 230 kV and above cables, please contact Mr Muhammad Supian, Senior

Principal Technical Officer of Extra High Voltage Network Section at Tel No. 6916

5550 or email: [email protected]

D. For cable tunnels, please contact Mr Kua Siang Meng, Principal Engineer

(Facilities Management Section) at Tel No. 6916 6008 or email

[email protected]

5.2.6 The Successful Tenderer shall notify SPPG 6 months before the commencement of

earthworks affecting distribution cables and 24 months if the work involves

transmission cables (66 kV and above). The cost of cable diversion / protection /

suspension incurred by SPPG shall be borne by the requesting party. The Successful

Tenderer shall not commence the proposed earthworks until the affected cables are

diverted/protected/suspended.

5.2.7 There are 400 A of power at low voltage level available from the 22 kV/ Low Voltage

(LV) electrical substation in the vicinity. If the farm operation requires more than 400

A of power at LV level, the Successful Tenderer shall construct their own 22kV/ LV

electrical substation as part of their farm development within their land parcel.

5.2.8 For more information on substation and connection requirement, etc. for your

proposal, the Successful Tenderer can consult Mr Ooi Wenyao, Principal Engineer of

Distribution Planning Section at Tel No. 6916 8551 or email:

[email protected]. For matters on substations to make way for

redevelopment works, please contact Mr Tan Juay Hwee, Senior Technical Officer of

Distribution Planning Section at Tel No. 69168385 or email:

[email protected].

5.2.9 For any further clarification, the Success Tenderer can contact Mr Chen Jianhong,

Senior Engineer of Earthworks Surveillance & Patrolling Section at Tel No. 6916 5116

or email: [email protected].

5.2.10 There are proposed transmission cable routes in the vicinity of the Land Parcel. For

more information, please contact Mr Yam Chee Yi, Technical Officer of Transmission

Engineering Section at Tel No. 6916 8989 or Mr Seow Kah Ghee, Technical Officer

of Transmission Engineering Section at Tel No. 6916 8988.

http://www.spgroup.com.sg/



6.0 MINISTRY OF DEFENCE (MINDEF)

6.1 General

6.1.1 The Successful Tenderer shall consult DSTA through URA – Development Control

Group when the detailed development plans are available.

6.1.2 All capital and operating costs or expenses incurred to meet all the conditions and

requirements below will be borne by the Successful Tenderer.


6.2.1 The Successful Tenderer shall ensure that all developments, structures and fixtures

for the Land Parcel(s) shall not exceed the maximum height of 60m Singapore Height

Datum (SHD). Such developments, structures and fixtures include those on the roof

tops, whether permanent, temporary, transient or stationary (including but not limited

to the building superstructure, lampposts, cranes, maintenance equipment, lightning

conductors, moving objects, vegetation etc.) and all construction equipment and

temporary structures (including but not limited to cranes, piling rigs, etc.) which shall

all be subject to the same height limit(s). Republic of Singapore Air Force’s (RSAF)

clearance shall be sought for the use of construction equipment and temporary

structures above 45m SHD (Email: [email protected]).

6.2.2 As the subject site is located in proximity to Tengah Air Base, aircraft noise and

vibrations should be expected. As such, these effects should be taken into account

in the proposed development, and in particular, in the design of the facilities and

operating equipment. If necessary, the Successful Tenderer should assess if a noise

study should be carried out. The proposal must not impose any constraint on MINDEF

or curtail its existing and future developments, operations and activities in any way.

For further information on noise issues, the Successful Tenderer can consult NEA.

7.0 SINGAPORE CIVIL DEFENCE FORCE (SCDF)

7.1 General

7.1.1 For Fire Safety requirements, the Successful Tenderer is required to comply with the

Fire Safety Act and Regulations (ANNEX D). If the Successful Tenderer has any

clarifications on Fire Safety requirements, the Successful Tenderer should consult the

Fire Safety and Shelter Department (FSSD) located at SCDF Headquarters. The

Successful Tenderer shall ensure fulfilment of the necessary FSSD requirements.


7.2.1 No Petroleum and Flammable Material (P&FM)/ hazardous substances shall be

stored at the said premises should the finalized use be a store room.


7.2.2 The Successful Tenderer can refer to the SCDF’s P&FM Regulations for definition of

P&FM and NEA’s Environmental Protection and Management Act (EPMA) for

definition of hazardous substances.

8.0 LAND TRANSPORT AUTHORITY (LTA)

8.1 General

8.1.1 The Successful Tenderer shall prepare/ design, submit, supervise and construct all

proposed street works, as well as proposed engineering/ construction works within

the road reserve in accordance with the Street Works (Private Street Works)

Regulations and the following prevailing standards and code of practice:

A. Street Work Proposals relating to Developmental Works

B. LTA Standard Details of Road Elements

C. Materials Workmanship Specifications for Civil and Structural Works

D. Code of Practice for Road Opening Works

E. Code of Practice for Traffic Control at Work Zone and,

F. Architectural Design Criteria and Civil Design Criteria

8.1.2 Prior approval from LTA is required for any deviation from the designated access

points as indicated in the Control Plans provided in the Technical Information Booklet.

8.1.3 The detailed plan for the said development, incorporating LTA’s requirements, shall

be submitted to LTA’s Development and Building Control Division at the relevant DC

and BP submission stages.

8.1.4 The proposed development is required to comply with the physical parking

requirement of the prevailing Parking Places (Provision of Parking Places and Parking

Spaces) Rules.

8.1.5 The Successful Tenderer shall abide to the following guidelines

A. There should be only one access for one development.

B. Turning radius of the access is in accordance to LTA standards.

C. The proposed access must have sufficient line-of-sight as in accordance to LTA

guideline.

D. Sufficient parking space should be provided within the development.

E. Parking/ waiting/ Pick Up/ Drop Off activities should be done within the

development, no parking/waiting/pick-up/drop-off activities are allowed along the

main road.

F. Any gantries provided within the development should be set back to at least 2 car

length into the development.

G. Pedestrian gate(s), if any, should be located near bus stops and/or nearby crossing

facilities if any.

H. The access points should not be blocked by any obstruction on the verge.


I. The access point will have to be at least 30m away from the nearest access along

this stretch of road.

J. To include stop line 1m away from the kerb and stop sign at the access.

K. The fencing/ barrier should be set back so that the traffic are not blocked by the

development traffic.

L. The fencing (if any), beside the access, should be clear of blockage so as not to

affect the line-of-sight for the exiting motorist and the pedestrian. Ensure the

boundary walls do not block the line-of-sight of vehicles exiting from the

development.

M. The width of the permanence access should be designed in accordance to the

latest Code of Practice (Street Work Proposal Relating to Development Works) for

single-user. To provide a swept path analysis for the access for in/out movement.

8.1.6 The Successful Tenderer shall also provide additional signage if deemed necessary

in his design or as instructed by LTA. Directional signage outside the scope of the

project, if affected by the project, shall also be included in the design submission.

Road signage includes directional / information signs.

9.0 NATIONAL PARKS BOARD (NParks)

9.1 General

9.1.1 Pursuant to the Parks & Trees Act (Cap.216) read together with the Parks and Trees

Regulations (Reg. 1), any tree with a girth exceeding one metre measured one metre

from the ground, growing on any tree conservation area or any vacant land shall not

be cut except with the prior approval of the Commissioner of Parks and Recreation.

9.1.2 The Successful Tenderer shall ensure that roadside trees and green verge(s) abutting

the Land Parcel(s) is not to be affected, especially by vehicular ingress/egress,

acceleration/deceleration/storage/vehicular lanes, services access, bus stops, and

any structure required under statute to be erected to divert or reconstruct services or

road features/elements, etc. Similarly, the Successful Tenderer shall ensure that pick-

up/drop-off points, taxi lay-bys, loading/unloading bays and fire engine hard-standing

areas are to be located within the Land Parcel(s).

9.1.3 The Successful Tenderer shall replace the existing roadside trees and green verge

fronting the Land Parcel(s) if it is affected by the proposed use. The width of the

replacement green verge should be in accordance to LTA’s standard road code for

that category of road or match the existing green verge along the road, whichever is

wider.

9.1.4 The Successful Tenderer shall not change the soil level to the roadside planting verge

without prior approval from NParks.

9.1.5 The Successful Tenderer shall ensure that the development works must not widen

and/or raise existing carriageways and realign road kerbs and drains on abutting

roads without prior approvals from the relevant authorities.


9.1.6 The Successful Tenderer shall ensure that the development works are to be confined

within the Land Parcel(s) and working boundaries. There must not be any illegal

dumping or storing of construction materials beyond the approved boundaries. The

proposed development shall not encroach on the road reserve line and affect any

roadside table.

9.1.7 The Successful Tenderer shall comply with requirements for green buffers and 2 m

wide peripheral planting verges. The green buffers and peripheral planting verges

must be free from any encroachment above ground, and/or any structures or services

are to be recessed to at least 2 m below ground level, and are not to slope with

gradients steeper than 1:2.5.

9.1.8 The Successful Tenderer shall consult NParks’ Greenery and Development Planning

(GDP) Branch early at the planning and design stage on the felling of any trees that

may be affected by the proposed development with a copy of recently survey plan of

the site (of less than 2 years) and its peripheral roads, at a scale of at least 1:500,

clearly indicating information of trees, such as location, species, height and girth.

Relevant additional information such as plans on construction hoardings should also

be submitted.

9.1.9 The Successful Tenderer shall consult NParks on the tree protection criteria for

roadside trees during early planning and design stage.

9.1.10 The Successful Tenderer shall inform NParks at least 8 weeks before the

commencement of works for NParks to transplant/salvage existing affected plants

within the Land Parcel(s) and/or along affected roadside tables.

9.1.11 The Successful Tenderer shall comply with planting provision and aeration

requirements for open air parking at street level. More details can be viewed on

NParks’ website at https://www.nparks.gov.sg/-/media/nparks-real-content/partner-

us/developers-architects-and-engineers/guidelines-on-greenery-provision-and-tree-

conservation-for-developments_version-3.pdf. See Chapter 3 on “Planting Provision

for Open Air Parking Area at Street Level”.

9.2 Particular Requirement

9.2.1 There is a proposed Park Connector along the eastern boundary of ST35A within the

drainage reserve of Sungei Peng Siang. The Successful Tenderer is to ensure that

the land safeguarded within the Drainage Reserve for future Park Connector is not

affected by the development within the Land Parcel.

https://www.nparks.gov.sg/-/media/nparks-real-content/partner-us/developers-architects-and-engineers/guidelines-on-greenery-provision-and-tree-conservation-for-developments_version-3.pdf




10.0 PUBLIC UTILITIES BOARD (PUB) REQUIREMENTS

(A) DRAINAGE

10.1 General

10.1.1 Water pollution control requirements as stipulated in Environmental Protection and

Management Act (EPMA) shall be fully complied with. The discharge from any

agricultural sites into the drainage system shall comply with Allowable Limits for Trade

Effluent Discharge to Controlled Watercourses under the EPMA (Trade Effluent)

Regulations and PUB’s discharge water quality requirements of Total Nitrogen ≤ 10

mg/L; Total Phosphorus ≤ 0.65 mg/L and Total Suspended Solids ≤ 30 mg/L for water

catchment areas.

10.1.2 PUB has in 2006 launched the Active, Beautiful and Clean Waters (ABC Waters)

Programme. As part of the Programme, PUB has launched ABC Waters design

guidelines which provide ideas on how natural runoff treatment systems termed ABC

Waters design features such as rain gardens, vegetated swales and bioretention

swales can be integrated within a development. These features detain/ slow down

stormwater runoff and improve water quality by using plants and soil. They also

enhance landscape and biodiversity of the development. Specific information on the

design of these features can be found at the website

https://www.pub.gov.sg/abcwaters/designguidelines.

10.1.3 Industrial, commercial, institutional and residential developments greater than or

equal to 0.2 hectares in size are required to control the peak runoff discharged from

the development sites. The maximum allowable peak runoff to be discharged to the

public drains will be calculated based on a runoff coefficient of 0.55, and for design

storms with a return period of 10 years and for various storm durations of up to 4

hours (inclusive). Peak runoff reduction can be achieved through the implementation

of ABC Waters design features and structural detention and retention features, such

as:

A. Detention tanks;

B. Retention/Sedimentation ponds;

C. Wetlands;

D. Bioretention swales;

E. Bioretention basins or rain gardens,

F. Porous pavements.

10.1.4 The Qualified Person (QP) shall be required to submit details (calculations and/or

hydraulic model results) showing how the proposed system meets the required peak

runoff rates. Due consideration shall be given to meeting ABC Waters stormwater

quality objectives, which will often require treatment of stormwater runoff using ABC

Waters design features. For design guidance on the ABC Waters design features,

developer/ QPs can refer to the ABC Waters Guidelines and relevant chapters in the

Engineering Procedures, available on the PUB website.

https://www.pub.gov.sg/abcwaters/designguidelines


10.1.5 PUB encourages the implementation of ABC Waters design features in the

development as well as the achievement of ABC Waters certification. Information

regarding ABC Waters Certification can be found via the link:

https://www.pub.gov.sg/abcwaters/certification. If applicable, the design and

construction supervision of ABC Waters design features as well as drawing up the

maintenance plan for these features shall be carried out by an ABC Waters

Professional. The Successful Tenderer can also apply for ABC Waters Certification.

The Successful Tenderer could contact Ms Ong Geok Suat

([email protected]) and Ms Enid Chen ([email protected]) for

issues related to ABC Waters design features.

10.1.6 The planning, design, construction activities and procedures for plan submission shall

comply fully with the requirements as stipulated in the current edition of the Code of Practice on Surface Water Drainage and The Sewerage and Drainage (Surface Water Drainage) Regulations 2007. The Successful Tenderer may download the latest version of the COP from the PUB website https://www.pub.gov.sg/drainage/COPsurfacewaterdrainage.

10.1.7 Effective erosion and sediment control measures shall be provided by the Successful Tenderer and the appointed QP shall advise the Successful Tenderer to provide such effective measures and facilities with inputs from Qualified Erosion Control Professional (including site management system and perimeter cutoff drain, silt traps, storage ponds, treatment plants, etc) to ensure clean discharge that complies with the statutory requirement. The proposed erosion and sediment control measures shall be submitted by a Qualified Erosion Control Professional (QECP) to Public Utilities Board before commencement of works. All affected watercourses shall be desilted and cleared until completion of work.

10.1.9 The Inter-Ministerial Committee on Climate Change endorsed the proposal for drainage design to protect catchments for the projected 75th percentile increase in rainfall intensity due to climate change. Based on the asset life of the drain of 50 years, this corresponds to a 25% increase in rainfall intensity and the revised rainfall intensity incorporating the additional 25% increase shall be used in the design of the drainage infrastructure.

10.1.10 The design and construction of the proposed development within the site shall not

cause or affect the structural integrity of the roadside drain/outlet drain. The existing drainage system shall not be altered or interfered with without the prior approval of PUB(C&W).


10.2.1 The proposed site is within the Kranji water catchment. The proposal shall not result in any loss of yield from the catchment area.

10.2.2 ST35A is abutting drainage reserves (DR) as shown indicatively in Annex E. All

structures including the foundation and proposed works shall not encroach into the drainage reserves.

10.2.3 If the development site abuts a watercourse (reservoir or storm drain), the Successful

Tenderer shall provide and maintain a 2m peripheral planting verge along the length

https://www.pub.gov.sg/abcwaters/certification


of the boundary abutting the watercourse, within the Land Parcel. There shall be no agricultural activities within the buffer strip.

10.2.4 The drains within the Land Parcel shall be regularly de-silted and maintained.

10.2.5 Stringent pollution control measures shall be incorporated in the design and during the construction of the proposed development.

10.2.6 All sewage and sullage water shall be discharged into a public sewer. 10.2.7 Bulk storage of toxic and hazardous materials shall not be allowed.

10.2.8 If there is any earth filling work at the development site, use good earth free of any debris or construction waste materials. If sand is used for backfilling, do not use marine sand. Only washed sand with chloride content not exceeding 0.01% (by Weight) shall be allowed. Test reports on the chloride content of the washed sand shall be submitted to PUB(C&W) for records before commencement of work.

10.2.9 The minimum platform level (MPL) for industrial/ institutional/ commercial/ multi-unit residential developments shall not be lower than 4.5m above Singapore Height Datum or lower than 600mm above the adjacent road/ground level, whichever is the highest.

10.2.10 In complying with the minimum platform level requirement, the Successful Tenderer shall conduct thorough investigations of the sites and determine suitable platform profiles to ensure that the runoff within, upstream of and adjacent to the development site can be effectively drained away without causing flooding within the site or in the vicinity of the site. Any proposal to level/ backfill the subject site shall be submitted to PUB(C&W) for comments and approval.

10.2.11 The existing drainage system within and in the vicinity of the sites shall be upgraded/ improved to cater for increased runoff from the proposed development. The ST shall reconstruct the existing drains/ culverts affected by the proposed development to the required size as determined by PUB.

10.2.12 Best management practice (BMP) is to be adopted to prevent the discharge of nutrient-rich water into the watercourse/ reservoir. Such BMP could be in the form of a cut-off drain be constructed along the boundary of farming areas to channel all runoff with high nutrient (Nitrogen and Phosphorus) to a treatment pond (as illustrated in Diagram 1) which is designed to treat the pond water to meet the discharge water quality indicated in Clause 10.1.1. Alternative proposals designed and endorsed by a Qualified Person (QP) to meet the discharge water quality requirements can be submitted for PUB’s approval.


DIAGRAM 1: A TYPICAL CUT-OFF DRAIN AND TREATMENT POND FOR

AGRICULTURAL RUNOFF MANAGEMENT

10.2.13 A typical design of a treatment pond to treat the pond water before discharge into the storm drain is shown in Diagram 2 for reference. The design of the treatment pond with sufficient size shall be endorsed by a QP. Some suggested wetland plants that can be used at the treatment pond are shown in Table 1. Details on the construction of wetlands and vegetated swale can be found in the ABC Waters Design Guidelines at https//www.pub.gov.sg/abcwaters/designguidelines.

Water treatment

pond NON FARMING AREA

PU

B S

TOR

M D

RA

IN

Connecting drain from pond to PUB storm drain (overflow only)

Farm boundary

Cut-off drain to channel runoff to treatment pond

FARMING AREA

*Not to scale


Diagram 2: A TYPICAL TREATMENT POND

Alligator Flag

(Thalia geniculate)

Fragrant Pandan

(Pandanus amaryllifolius)

Cattail

(Typha angustifolia)

Pond surface

aerator

Floating wetland with Pandan plants and pond edge planting with Cattails and Thalia

Aerator

Regular removal of sludge from the pond

TABLE 1: TYPICAL WETLAND PLANTS SUITABLE FOR USE IN

TREATMENT PONDS

Plant species Water-treatment function

Papyrus reed / Egyptian Paper

Plant (Cyperus papyrus)

Reduces nitrogen and phosphorus and able

to accumulate copper, zinc and lead

Cattail (Typha angustifolia) Reduces nitrogen and phosphorus,

accumulates a range of heavy metals and

serves as habitat for a variety of animals

Blue Rush / Tube Sedge

(Lepironia articulata)

Reduces nitrogen and phosphorus and

accumulates lead


10.2.14 Ponds shall be regularly de-sludged and the sludge shall be disposed off-site.

10.2.15 No raw animal waste shall be allowed for use as fertilizer in vegetable farming activities.

10.2.16 All compost shall be fully composted before use and composting activities (if any) shall be carried out using proper composting facilities in roofed and curbed areas such as concrete flooring to prevent feedstocks from leaching into the ground and entering the storm drain. All feedstocks for composting shall be stored in roofed and curbed areas with impervious flooring.

10.2.17 Only pesticides (including herbicides) registered with SFA are allowed to be used in the agricultural activities.

10.2.18 All pesticides (including herbicides) shall be used in accordance with the manufacturers' recommendations and guidelines.

10.2.19 No fertilizers, soil amendments and pesticides (including herbicides) shall be applied within 2m of storm drain or reservoir.

10.2.20 Proper storage and disposal measures shall be taken to prevent any fertilizers, soil amendments, pesticides (including herbicides), and plant waste from entering storm drain. They are to be stored in roofed/properly covered areas.

10.2.21 Fish ponds shall be properly and adequately designed to ensure no overflow and

leakage into the storm drain.

10.2.22 If seawater is used in the fish farming, no seawater shall be discharged into the public sewer and storm drain. All used seawater shall be properly collected and disposed off-site.

Dwarf Papyrus (Cyperus haspan

var. viviparus)

Able to absorb nitrogen and phosphorus

rapidly

Water Canna / Alligator Flag

(Thalia dealbata / Thalia

geniculata)

Reduces nitrogen and phosphorus

Fragrant Pandan (Pandanus

amaryllifolius)


Pickerelweed (Pontederia cordata

L.)


Ricefield bulrush (Scirpus

mucronatus)



10.2.23 Proper storage and disposal measures shall be taken to prevent any fish waste, dead fish, and plant waste and sludge, from entering the storm drain and reservoir.

(B) USED WATER

10.3 General

10.3.1 The planning, design and construction and plan submission for sewerage works shall

comply fully with the provisions of the Sewerage and Drainage Act, the Sewerage

and, Drainage (Sanitary Works) Regulations, the requirements as stipulated in the

prevailing Code of Practice on Sewerage and Sanitary Works and all other sewerage

requirements that may be stipulated from time to time by the Public Utilities Board

(PUB).

10.3.2 The Successful Tenderer must check for the presence of public sewerage pipelines

by referring to the Sewer Information Plan (SIP) and through site investigation. The

SIP is available on SLA’s INLIS at https://www.sla.gov.sg/INLIS/#/PUB/UP/Search.

Please note that the sewerage information in SIPs is indicative and for reference only.

A thorough site investigation, including trial trenches, shall be carried out to determine

the exact position and levels of the existing sewers.

10.3.3 The Successful Tenderer shall note that no works shall commence within the public

sewer corridor until a written approval from PUB has been obtained. The guideline on

‘Prevention of Damage to Public Sewerage System’ can be found in PUB website at

https://www.pub.gov.sg/Documents/WRN_AdvisoryNotes.pdf. Successful Tenderers

/Owner is required to submit a notification to our Network Management Branch (NMB)

at least 7 days before the commencement of any works or specified activities within

the public sewer corridor.

10.3.4 Trade effluent discharge from the proposed development into the public sewerage

system shall comply with the requirements as stipulated in the Sewerage and

Drainage (Trade Effluent) Regulations. Pre-treatment plant/facilities shall be installed

to ensure the compliance of the trade effluent with the discharge requirements. The

Successful Tenderer shall be responsible for the provision, operation and

maintenance of the pre-treatment plant/ facilities. A summary of the discharge

requirements for trade effluent can be viewed from PUB website at:

https://www.pub.gov.sg/Documents/requirements_UW.pdf.

10.3.5 The application for Written Approval (WA) can be done online at

https://www.gobusiness.gov.sg/licences.. For matters relating to trade effluent

discharge, please contact Ms Lee Pei Zhen (Tel: 6517 2201 or email:

[email protected]), Mr Quek Chia Woo (Tel: 6517 2242 or

email: [email protected]) or Mr Abdul Muiz Mustaffa

(email: [email protected]) from PUB(WRN) Department.

10.3.6 Manholes shall not be buried under any circumstances. Where there is a need to

raise or lower any existing manholes, the Successful Tenderer shall liaise with

PUB(WRN)’s Network Management Branch on such proposals and carry out the

https://www.sla.gov.sg/INLIS/#/PUB/UP/Search

https://www.pub.gov.sg/Documents/WRN_AdvisoryNotes.pdf

https://www.gobusiness.gov.sg/licences


necessary works at his own cost and expense. The final manhole top level shall be

surveyed using the affected existing manhole’s invert level as the Temporary Bench

Mark (TBM). The as-built drawings showing the final top levels of the impacted

manholes shall be submitted to PUB(WRN). The as-built drawings showing the raised

or lowered top levels of the manholes shall be submitted to PUB(WRN). For proposals

relating to the abovementioned, please contact Mr Muhd Nur Afiq Selamat (email:

[email protected]) or Mr Muhd Nabil Mohd Raus (email:

[email protected]) at Tel: 6517 2230 from PUB(WRN).

10.3.7 No utilities services (cable, gas pipe, water pipes, etc) either permanent or temporary

shall over-cross/under-cross within one meter (1 m) from any sewers or pumping

mains. In addition, pre- and post-construction CCTV inspection shall be carried out

on the affected sewers and manholes. The CCTV reports and video shall be

submitted to PUB(WRN). A Water Research Company, plc UK (WRc) certified CCTV

specialist contractor [https://www.pub.gov.sg/Documents/RegisteredCCTVContra

ctor.pdf] shall be engaged to interpret, prepare, and certify CCTV reports in

accordance with PUB(WRN)'s CCTV inspection requirements. Please note that the

defect classification shall be in accordance with the latest edition of the WRc/WAA

"Manual of Sewer Condition Classification".

10.3.8 No sewerage systems (including abandoned sewers/ pumping mains, any sensors,

meters, equipment, instruments etc within manholes) shall be altered/interfered with

without the approval of PUB(WRN). Where diversion/removal of any sewer/pumping

main is required, it shall be carried out by the Successful Tenderer at his own cost &

expense. Details of the diversion (pipe size, gradient, invert level, etc) shall be

submitted to PUB(WRN) for approval before the commencement of works.

10.3.9 All sewers and manholes shall be readily accessible at all times to PUB.

10.3.10 Setback from Sewers and Sewerage Facilities

A. No building structure/piling/retaining structure etc (whether temporary or

permanent) except lightweight and demountable elements (such as awnings,

surface drains, compound boundary wall & fencing, planting troughs and link-

way shelters), shall be sited over or across any sewers/pumping mains without

the approval of PUB. All proposed structures shall be kept as far away from the

existing sewers /pumping mains as possible and no nearer than the following

minimum lateral clearances (also known as sewer / pumping main setback)

from the centreline of the sewer pipe

Sewer/Pumping Main

Diameter (mm) Nett Clearance Required (Setback)

100 to 600 (depth ≤ 3 m) 1.0 m from outer edge of any structure

to centreline of sewer




100 to 600 (depth > 3 m to 5

m)

1.5 m from outer edge of any structure


100 to 600 (depth > 5 m) 2.0 m from outer edge of any structure


10.3.11 Where there are any Specified Activities within the public sewer corridor [i.e. 10 m for

sewer/main of diameter <900 mm, 20 m for sewer/main of diameter ≥ 900 mm and 40 m for DTSS tunnel] as stipulated in PUB’s Code of Practice, a written approval from the Director, PUB Water Reclamation Network (WRN) should first be obtained before carrying out the specified activities at the site. QP shall submit the Application Form via the Protection of Water and Sewer Pipes (POWS) at http://bpu.pub.gov.sg/pows prior to any commencement of the specified activities.


10.4.1 The Successful Tenderer shall ensure that the premises is served by an adequate,

effective and functional internal sanitary drainage and plumbing system and be

connected to public sewers. Sewer connection shall be made to the existing 400mm

diameter sewer along Sungei Tengah Road (fronting the plot).

10.4.2 The Successful Tenderer shall comply with the minimum setback from the proposed

sewers with reference to Clause 10.3.10 and ensure that the proposed

development/service/work does not impact the sewer laying works. In addition, the

Successful Tenderer shall not impose any setback requirements from the proposed

development/service that affect the alignment of the proposed sewers and/or

subsequent operations & maintenance of the sewers.

10.4.3 Due to the terrain of the plot, an ejector system may be required. This is needed to

prevent backflow to the property in the event of high used water level in the sewer

due to sewer blockage. If ejectors are not used, the Successful Tenderer is to ensure

that the floor level of the house and the levels of the sanitary appliances, floor traps

and inspection chambers shall be constructed suitably higher than the top level of the

manhole to which the sanitary drainline is connected, as stipulated in COPSSW (2nd

Ed.) Section 1.2.1 (b) and PUB(WRN)’s standard drawing PUB/WRN/STD/007B.

(https://www.pub.gov.sg/compliance/industry/drawings).

10.4.4 Trade effluent generated from land based aquaculture farms needs to be treated to

comply with the allowable limits, before it is discharged into a public sewer. Where a

public sewer is not available, it has to be collected, pre-treated and disposed of at

water reclamation plants approved by or treated to comply with the allowable limits

for discharge into a watercourse with the prior written approval from the proper

authorities. Sludge, if generated, should be stabilised, dewatered and disposed of as

solid waste.

10.4.5 All effluents that are prohibited to be discharged into a public sewer shall be disposed

of by only NEA licensed toxic industrial waste collector. After obtaining Temporary

http://bpu.pub.gov.sg/pows

https://www.pub.gov.sg/compliance/industry/drawings


Occupation Permit (TOP) for the development, the operator shall apply to PUB a

“Written Approval to Discharge Trade Effluent. The applicant shall obtain a Written

Approval (WA) issued by PUB for the discharge of trade effluent into public sewers.

(C) WATER SUPPLY

10.5 General

10.5.1 The Successful Tenderer shall liaise with the Water Supply (Network) Department of

the Public Utilities Board (PUB) on the requirements for water supply to the Land

Parcel.

10.5.2 The Successful Tenderer may contact Ms Olivia Teo at Tel: 6731 3967 / Mr Ow Zhao

Hui at Tel: 6731 3934 if you need any clarifications on the water supply requirements.

10.5.3 Please refer to Annex F for details on marking of water pipes and submission of plans.


10.6.1 Based on information given by Water Supply (Network) Department of the PUB, there

are existing watermains of 100 mm diameter and above in the vicinity of ST35A as

shown in Annex F-1.

10.6.2 PUB may lay new watermains, if required, along public road reserves/sidetables to

the Land Parcel. The cost for the laying of new watermains, if any, and connecting

pipes to serve the Land Parcel shall be borne by the Successful Tenderer.

11.0 COMPLIANCE WITH TECHNICAL CONDITIONS OF RELEVANT AUTHORITIES

11.1 The Successful Tenderer is required to consult and comply with all the technical

conditions imposed by the relevant authorities such as Singapore Food Agency,

National Environment Agency, Public Utilities Board, PowerGas, SP PowerGrid,

Ministry of Defence, Singapore Civil Defence Force, Land Transport Authority,

National Parks Board and the Urban Redevelopment Authority et cetera at farm

development plan, the detailed development control and building plan stages.

Annex A

SP PowerGrid Ltd GDP-24(0110)

1

To all concerned parties

We act for PowerGas Ltd.

Requirements for Distribution Gas Mains Diversion Works

1. Prior to any excavation works, the project owner / contractor shall request for gas servicesreturns and acquire the gas plans.

2. A minimum clearance of 300mm shall be maintained between our gas pipes and all otherservices or structure.

3. Where any gas pipes are affected, the project owner / contractor shall liaise with GasDistribution Projects for diversion of pipes. As far as possible, no gas pipes shall be withinthe hoarding area of the work site.

4. The project owner / contractor shall provide a corridor to facilitate diversion.

5. Wherever possible, isolation valves shall be inserted to enable quick isolation of pipelinewithin the work site (eg. crossing of bored tunnels, cut-and-cover tunnels, etc.). Theseisolation valves should not be located inside the work site.

6. Where the cut-and-cover tunnel runs parallel to the existing gas mains, there shall be aminimum clearance of 5 metres from the diaphragm wall.

7. All vent shafts to the tunnels shall be at least 20 metres away from the existing gas mains.

8. All piles shall be at least 5 metres away from the existing gas mains, which shall bedetermined by trial holes.

9. All crossings over cut-and-cover tunnels shall be replaced temporarily with steel pipes forsuspension and subsequently replaced with the original pipe materials upon the completion ofthe construction work. The steel pipe supports shall be endorsed by a Professional Engineerand submit to SPPG Gas Operations for approval. The support system shall allow access tothe pipe for inspection and for fire-fighting purposes in the event of an emergency.

10. No Air intake / outlet shall be located nearby existing gas mains.

11. Depending on the extent and complexity of diversion, a long lead-time may be required.Hence, the project owner is advised to consult SPPG Gas Operations early.

12. The project owner / contractor shall coordinate all diversion activities.

13. Where required, the project owner / contractor shall peg the agreed corridor for the laying ofthe diversion pipeline.

US2NAF1

Text Box

Annex A

SP PowerGrid Ltd GDP-24(0110)

2

14. The project owner / contractor shall be aware of all gas pipes within the work site, and shallensure that all parties working within the site are also aware of the locations of the gas pipes.Where possible, prominent markers indicating the pipe route shall be displayed.

15. The project owner / contractor shall be responsible to inspect, protect and maintain theintegrity of gas pipes within the work site, and observe the following:

15.1. No building structure is allowed to be built over all existing gas mains.

15.2. No heavy machinery/equipment is allowed to be placed or constructed over all existinggas mains.

15.3. No heavy machinery / vehicle movement over the existing gas mains.

15.4. .Leak survey along the pipe route within the work site shall be conducted regularly.

16. Wherever possible, no hot work is allowed in the vicinity of gas pipes. If hot work isunavoidable, the project owner / contractor shall take all necessary measures, including butnot limited to the following:

16.1. the site shall be certified gas-free by a qualified Safety Officer.

16.2. gas-free checks shall be conducted regularly before commencement of work andthroughout the work.

16.3. all necessary precautions to prevent damage to the existing gas mains shall be taken.

16.4. all possible occurrence of fire hazards shall be eliminated.

16.5. where possible, physically separate the gas pipe from the heat source.

16.6. where necessary, consult SPPG Gas Operations on other precautionary actions to betaken.

17. Valve chambers which are still located within the work site due to site constraints, shall beraised 0.5metre above ground and kept visible and accessible at all times, to enable easyidentification and operation in the event of an emergency.

18. The project owner / contractor shall notify SPPG Gas Operations of any works directly orindirectly affecting the existing gas mains or the newly diverted gas mains.

19. The project owner / contractor shall monitor possible ground movements / soil subsidence inthe vicinity of their work sites and inform SPPG Gas Operations immediately if any suchmovements / subsidence is observed / detected and where gas pipes are present.

20. In the event that any gas leak is detected, all works shall cease immediately and SPPG GasOperations 24 hrs Gas Service Operation Centre shall be contacted at Tel: 1800-752-1800for assistance.

Annex B

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SP PowerGrid Ltd Company Registration No. 200306959Z



NOTES FOR WORKING NEAR POWERGAS GAS TRANSMISSION PIPELINE

1. Introduction 1.1 The Gas Transmission Pipeline (GTP) is designed to carry gas at high pressures. It is

buried underground with granite dust and earth backfill cover as required under LTA’s regulations. Warning markers are planted near the pipeline to indicate its existence and warn third parties working in the area.

1.2 SPPG patrols the pipeline regularly to monitor works in the vicinity by third parties. Such

works if done without knowing the existence and/or exact location of the pipeline can potentially damage the pipeline and/or it’s coating. SPPG pays special attention to drilling, piling, blasting or any high impact works, excavation and tunneling works and construction of structures near or over the pipeline.

1.3 Any party who intend to carry out any construction activities in the vicinity of the GTP shall

notify and collaborate with SPPG to implement measures to protect the pipeline from all possible damages.

2. Statutory Requirement 2.1 Section 32 Carrying out earthworks within vicinity of gas plant or gas pipe of the Gas Act

(Chapter 116A) requires anyone who wants to carry out earthworks in the vicinity of the gas plant or gas pipe to

(a) give the gas transporter (SPPG) not less than 7 days’ notice in writing of the date on which it is proposed to commence the earthworks; (b) obtain from the gas transporter the necessary information on the location of the gas plant or gas pipe; and (c) consult the gas transporter on the steps to be taken to prevent the gas plant or gas pipe from being damaged while the earthworks are being carried out.

2.2 Section 32 also requires the person carrying out the earthwork to comply with the requirements of the transporter, ensure precautionary measures are taken to prevent damage to the gas pipe or gas plant and provide access to the transporter for inspection or taking necessary protective measures.

2.3 Any person that contravenes this Section 32 is guilty of an offence and shall be liable to a

fine not exceeding $100,000 or to imprisonment for a term not exceeding 5 years or both.

US2NAF1

Typewritten Text

Annex B

of 5


3. Requirements on Third Parties working near the Gas Transmission Pipeline

3.1 Pre-work Consultation with SPPG a) The works owner and contractor shall inform SPPG in advance of their intention to work in

the vicinity of the GTP and submit NCE accordingly. Such works include excavation, piling, earthwork leveling, bore logging, trial holes, blasting, tunneling or any earth works. The proposed work with construction drawings and method of statements shall be given to SPPG to evaluate the impact of the works on the pipeline. This enables SPPG to advise on appropriate precautionary measures to be taken.

b) The works owner and contractor shall obtain the as-built drawings of GTP from SPPG.

They are required to incorporate the pipeline alignment co-ordinates into their construction drawings. Please note that the information in the as-built drawings should be treated as confidential. Do not disclose or forward them to others.

c) No works in the vicinity of GTP shall be carried out without prior consultation and written clearance from SPPG.

d) SPPG shall be kept informed of any changes to the proposed works. e) No permanent structures shall be designed and constructed above the GTP. However,

surface road over the pipeline without reducing the pipeline cover may be acceptable, subject to SPPG's concurrence.

3.2 Precautionary Measures during Works a) The works owner and contractor shall take all necessary precautions to prevent any

damages to the GTP during the construction stage. They shall inform SPPG before carrying out any excavation works near the pipeline and report all damages to the pipeline and its coating to SPPG. Repair shall be done immediately to prevent corrosion aggravation to the pipeline at the damage location and thus becoming a potential hazard.

b) If any earthwork is within 5m of the pipeline (or more when required), a competent

surveyor shall be engaged to peg the pipeline alignment and interpret the pipeline depth from the pipeline drawings. Pegging and marking shall be clear and prominent and remain as such for the duration of works. Trial holes to prove the location of the GTP shall be carried out and all trial holes shall only be done in the presence of SPPG officer. The contractor's competent personnel shall supervise the earthwork, monitoring closely the pipeline depth based on the surveyor's interpretation.

c) Only manual excavation is allowed within 1m of the pipeline and only hand excavation is allowed within 0.5m of the pipeline.

d) Under no circumstance shall the GTP be exposed without written consent of SPPG. GTP

shall only be exposed in the presence of SPPG Officer. If a GTP is exposed, the owner/contractor shall take the necessary measures to protect the pipe from any physical impact that may cause damage to the pipe and/or its coatings to the satisfaction of SPPG.

e) Do not shift or remove warning markers indicating the existence of the GTP at site without

SPPG’s approval. The contractor shall protect them from being damaged or tempered. In the event the warning markers are damaged, they shall be reported to SPPG and replaced immediately. Where necessary, additional temporary warning markers shall be installed to warn others of the presence of gas pipeline.

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f) For blasting works, piling or any works that cause ground vibration, the peak particle velocity (PPV) of ground shock generated by the blast shall be limited to 15mm/s measured at the pipeline. The PPV shall be monitored in real time. SPPG shall be notified once the PPV reaches 10mm/s.

g) For tunneling, shaft excavation and piling works, ground consolidation could occur due

to ground water losses resulting in surface settlement. This settlement can potentially induce excessive stress on the pipeline. The contractor shall conduct a risk assessment to assess the impact of tunneling on the surrounding area. To monitor the surface settlement, surface monitoring points shall be installed along the pipeline alignment at every 10m intervals for at least 100m pipe length from the tunnel or shaft. The settlement shall be regularly monitored while excavation or tunneling works are being carried out. A differential settlement of 20mm will require all parties involved to assess the ground consolidation and evaluate the need to implement measure to arrest the consolidation. A thorough stress analysis of the pipeline shall be done by competent persons recognised by SPPG if the differential settlement reaches 60mm. Depending on the findings of the analysis, measures shall be taken to relieve the pipeline from the stress.

h) For crossing and parallel laying of services to GTP, Table 1 shows the required

separation distance between the GTP and other services or structures. It should be noted that other authorities may have stricter or additional requirements on minimum separation distance between proposed building / structure and the pipeline than what is stated here. Services crossing the pipeline shall not be at the previous boring pit locations of the pipeline, the locations are to be advised by SPPG.

i) For major works that span over a long period of time, the owner and contractor shall hold

monthly meetings to update SPPG on the progress and any changes to their works. j) For any new development surrounding the GTP, the developer shall inform the property

owner on the location of the pipeline within their premises and draw up measures to prevent any possible damage to it. Pipeline within a fenced compound shall be accessible to SPPG for patrolling and any maintenance works as and when required.

3.3 Repair of Damage Pipe/Coating

In the event the pipe and/or its coating are damaged by the third party works, SPPG will undertake the necessary repair works. All costs of such repairs shall be borne by the third party responsible for the damage.

3.4 Emergency Works

When emergency works have to be done near the pipeline in the interest of public or private safety, the owner and contractor shall call SPPG at the 24-hour hotline at 1800 752 1800 or 6595 5003. SPPG officers will respond to site to advise on the prevention of pipeline damage. The Principal shall submit a written notice to EMCP within 24 hours after the work has commenced.

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4. Enquiries

The above requirements are only stated in general. The concerned party shall consult SPPG on all works near the GTP. SPPG reserves the right to alter any stated requirements or impose additional requirements that are necessary depending on site conditions and type of work. Refer all enquiries and correspondences on works near the GTP to:

Postal address Transmission Pipelines Operations and Maintenance (TPOM) Section SP PowerGrid Ltd (Gas Operation) National Gas Control Centre 24A Senoko Ave Singapore 758314 Fax: 6304 8851 Email: [email protected] Telephone numbers Transmission Pipelines Operations and Maintenance (TPOM) Section : 6595 5093 / 6595 5901 24-hour System Control Centre: 6595 5003 24-hour Customer Service Centre: 1800 752 1800

HEAD OF SECTION (TPOM) GAS TRANSMISSION MANAGEMENT BRANCH GAS OPERATION SP POWERGRID LTD As agent for and on behalf of PowerGas Ltd

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Table 1: Minimum Separation Distance Between GTP And Other Services / Structures

S/N Service / Structure Minimum separation distance

1. Bore / sheet piling 2.0m 2. 200x200 Concrete Piles 2.0m 3. Tunneling Clearance distance 2.0m or more. Depending on

size and depth, it may require monitoring of soil movement and settlement and risk assessment.

4. Directional Drilling 2.0m plus radius of final tunnel size 5. Formed Drain / Earth Drain 1.2m / 1.5m 6. Minor Drain 0.5m 7. Control Blasting 10m and PPV not more than 15mm/s. 8. Water/Sewer Pipe: less than 700mm

dia. 0.5m

9. Water/Sewer Pipe: 700mm dia.or larger

1.5m or more depending on size of pipe and construction method.

10. Electric Cables: less than 22 KV 0.5m 11. Electric Cables: 22KV and above 1.2m 12. Telecom cables 0.5m 13. Low pressure gas pipe 0.5m 14. Shrubs 1.2m 15. Trees 2.0m 16. Posts / foundations for light, signs etc 1.5m 17. Road Pavement 1.5m 18. Off-Road Crossing for heavy vehicles 1.5m or more with 25mm steel plating on surface. 19. Earthing Rods 5.0m

Annex C

of 4 SP PowerGrid Ltd Company Registration No. 200306959Z



NOTES FOR WORKING NEAR POWERGAS MEDIUM PRESSURE PIPELINE

1. Introduction 1.1 The Gas Pipeline is designed to carry gas to customers. It is buried underground with

granite dust and earth backfill cover as required under LTA’s regulations. Warning markers are planted near the pipeline to indicate its existence and warn third parties working in the area.

1.2 SPPG patrols the pipeline regularly to monitor works in the vicinity by third parties. Such

works if done without knowing the existence and/or exact location of the pipeline can potentially damage the pipeline. SPPG pays special attention to drilling, piling, blasting or any high impact works, excavation and tunneling works and construction of structures near or over the pipeline.

1.3 Any party who intend to carry out any construction activities in the vicinity of the gas pipe

shall notify and collaborate with SPPG to implement measures to protect the pipeline from all possible damages.

2. Statutory Requirement 2.1 Section 32 Carrying out earthworks within vicinity of gas pipe of the Gas Act (Chapter

116A) requires anyone who wants to carry out earthworks in the vicinity of the gas plant or gas pipe to

(a) Give the gas transporter (SPPG) not less than 7 days’ notice in writing of the date on which it is proposed to commence the earthworks; (b) Obtain from the gas transporter the necessary information on the location of the gas pipe; and (c) Consult the gas transporter on the steps to be taken to prevent the gas pipe from being damaged while the earthworks are being carried out.

2.2 Section 32 also requires the person carrying out the earthwork to comply with the requirements of the transporter, ensure precaution measures are taken to prevent damage to the gas pipe and provide access to the transporter for inspection or taking necessary protective measures.

2.3 Any person that contravenes this Section 32 is guilty of an offence and shall be liable to a

fine not exceeding $100,000 or to imprisonment for a term not exceeding 5 years or both.

3. Requirements on Third Parties working near the Gas Pipeline

3.1 Pre-work Consultation with SPPG a) The works owner and contractor must inform SPPG in advance of their intention to work in

the vicinity of the gas pipe and submit NCE accordingly. Such works include excavation, piling, earthwork leveling, bore logging, trial holes, blasting, tunneling or any earth works. The proposed work with construction drawings and method of statements must be given to SPPG to evaluate the impact of the works on the pipeline. This enables SPPG to advice on appropriate precautionary measures to be taken.

US2NAF1

Typewritten Text

Annex C


b) The works owner and contractor must obtain the gas plan from SPPG. They are required to incorporate the pipeline alignment route into their construction drawings. Please note that the information in the gas plan drawings should be treated as confidential. Do not disclose or forward them to others.

c) No permanent structures shall be designed and constructed above the Gas pipe..

However, surface road over the pipeline without reducing the pipeline cover may be acceptable, subject to SPPG's concurrence.

3.2 Precautionary Measures during Works a) The works owner and contractor must take all necessary precautions to prevent any

damages to the Gas pipe during the construction stage. They must inform SPPG before carrying out any excavation works near the pipeline. It is important to report all damages to the pipeline to SPPG. Repair must be done immediately to the pipeline at the damage location to prevent it from becoming a potential hazard.

b) If any earthwork is within 3m of the pipeline (or more when required), trial holes to

prove the location of the gas pipe will be carried out when required by SPPG and all trial holes must only be done in the presence of SPPG officer. The contractor's competent personnel shall supervise the earthwork, monitoring closely the pipeline depth. Only hand excavation is allowed within 0.5m of the pipeline.

c) Under no circumstance should the gas pipe be exposed without written consent of SPPG.

If a gas pipe is to be exposed, the owner/contractor must take the necessary measures to protect the pipe from any physical impact that may cause damage to the pipe and to the satisfaction of SPPG.

d) Do not shift or remove warning markers indicating the existence of the gas pipe at site

without SPPG’s approval. The contractor must protect them from being damaged or tempered. Where necessary, additional temporary warning markers should be installed to warn others of the pipeline's presence.

e) For blasting works, piling or any works that cause ground vibration, the peak particle

velocity (PPV) of ground shock generated by the blast should be limited to 15mm/s measured at the pipeline.

f) For tunneling and shaft excavation works, ground consolidation could occur due to

ground water losses resulting in surface settlement. This settlement can potentially induce excessive stress on the pipeline. The contractor should conduct a risk assessment to assess the impact of tunneling on the surrounding area. To monitor the surface settlement, surface monitoring points must be installed along the pipeline alignment at every 10m intervals for at least 100m pipe length from the tunnel or shaft. The settlement must be regularly monitored while excavation or tunneling works are being carried out. A differential settlement of 20mm will require all parties involved to assess the ground consolidation and evaluate the need to implement measure to arrest the consolidation. A thorough stress analysis of the pipeline must be done by competent persons recognized by SPPG if the differential settlement reaches 60mm. Depending on the findings of the analysis, measures must be taken to relieve the pipeline from the stress.

g) For crossing and parallel laying of services to gas pipe, Table 1 shows the required

separation distance between the gas pipe and other services or structures. It should be noted that other authorities may have stricter or additional requirements on minimum separation distance between proposed building / structure and the pipeline than what is stated here. Services crossing the pipeline must not be at the previous boring pit locations of the pipeline, the locations are which to be advised by SPPG.

h) For major works that span over a long period of time, the owner and contractor must

ensure that the gas pipe is securely protected.


i) For any new development surrounding the gas pipe, the developer must inform the

property owner on the location of the pipeline within their premises and draw up measures to prevent any possible damage to it. Pipeline within a fenced compound must be accessible to SPPG for patrolling and any maintenance works as and when required.

3.3 Repair of Damage Pipe

In the event the gas pipes are damaged by the third party works, SPPG will undertake the necessary repair works. All costs of such repairs shall be borne by the third party responsible for the damage.

3.4 Emergency Works

When urgent works resulting out of emergencies have to be done near the pipeline, the owner and contractor must call SPPG at the 24-hour hotline at 1800 752 1800. SPPG officers will respond at site within 2 hours of the call to verify the location of the pipeline and monitor excavation works.

4. Enquiries

The above requirements are only stated in general. The concerned party must consult SPPG on all works near the gas pipe. SPPG reserves the right to alter any stated requirements or impose additional requirements that are necessary depending on site conditions and type of work. Refer all enquiries and correspondences on works near the Gas Pipeline to:

Postal address SP PowerGrid Ltd (Gas Division) National Gas Control Centre 24A Senoko Ave Singapore 758314 Fax: 6595 5118 Attn: Distribution Pipelines Operations And Maintenance

Telephone numbers 24-hour System Control Centre : 6595 5003 24-hour Customer Service Centre: 1800 752 1800

HOS (Distribution Pipelines Operations And Maintenance) for HEAD OF BRANCH (GAS DISTRIBUTION MANAGEMENT) GAS OPERATIONS SP POWERGRID LTD As agent for and on behalf of PowerGas Ltd


Table 1: Minimum Separation Distance Between MP Gas Pipe And Other Services / Structures

S/N Service / Structure Minimum separation distance

1. Bore / sheet piling 1.0m 2. 200x200 Concrete Piles 1.0m 3. Tunneling Clearance distance 1.0m or more. Depending on

size and depth, it may require monitoring of soil movement and settlement and risk assessment.

4. Directional Drilling 1.0m plus radius of final tunnel size 5. Formed Drain / Earth Drain 1.0m / 1.2m 6. Minor Drain 0.5m 7. Control Blasting 10m and PPV not more than 15mm/s. 8. Water/Sewer Pipe: less than 700mm

diameter. 1.0m

9. Water/Sewer Pipe: 700mm diameter or larger

1.5m or more depending on size of pipe and construction method.

10. Electric Cables: less than 22 KV 1.0m 11. Electric Cables: 22KV and above 1.0m 12. Telecom cables 0.5m 13. High pressure gas pipe 0.5m 14. Shrubs 0.5m 15. Trees 2.0m 16. Posts / foundations for light, signs etc 1.5m 17. Road Pavement 1.5m 18. Off-Road Crossing for heavy vehicles 1.5m or more with 25mm steel plating on surface.

Annex D

1

Annex D

FIRE SAFETY REQUIREMENTS, SINGAPORE CIVIL DEFENCE FORCE (SCDF) 1. The developer and building owner/management/user (named as the Proposer) are

required to comply with the Fire Safety Act and Regulations, the prevailing "Code of Practice for Fire Safety Precautions in Buildings" (Fire Code), the relevant Codes of Practices & Guidelines, and SCDF Circulars. These general fire safety requirements are also applicable to any proposed temporary usage or installation. In addition, the following conditions will apply where applicable: A. To consult SCDF on the specific design requirements if the premises is to store,

handle, use, transport or import of hazardous materials, including petrol station or CNG station which may have impact within the premises or on the surrounding existing or new developments. SCDF may impose the Quantitative Risk Assessment study (QRA) and/or additional Fire Safety requirements, or disapprove such proposal if there is possible impact within the premises or on the surrounding developments.

B. To consult SCDF on any specific developments or structures having impact on

SCDF operations e.g. deep basement works (which are more than 4 storey or more than 24 metres in depth), tunnel or any other special developments, etc. SCDF may impose additional Fire Safety requirements.

C. The Proposer shall ensure that their proposal will not affect existing other

surrounding developments (neighbouring) such as their exit provision, sidelane / backlane, window openings [the unprotected openings requirements, i.e. the Proposer and their Qualified Person (QP) shall strictly observe these existing conditions and provide more setback if necessary to prevent fire spread] and fire engine accessway etc. The Proposer and their QP shall consult FSSD (SCDF) directly for those new proposed building structures to be sited near to common boundary line, as additional Fire Safety requirements may be imposed.

D. The Proposer shall ensure that no building structures be located within 25m buffer

zone from any petrol station, either be a existing or going-to-build petrol station.

E. For existing premises, the Proposer may wish to note that the FSSD’s Plan Approval and Fire Safety Certificate (FSC) will have to be obtained if there is any change in use or involving any alteration / addition works. The Proposer shall ensure that the existing premises, including existing layouts and usages, have obtained the necessary Approvals from FSSD/SCDF.

F. For lease extension, the Proposer is urged to engage their own QP in assisting

them to obtain the FSSD’s Plan Approval and Fire Safety Certificate (basing on the prevailing Fire Code) if it is not done so for the entire buildings/premises. The fire safety provisions and mitigation measures are essential for all buildings; it is particularly true for religious premises where congregation of general public is possible, and for premises with similar usage as Nursing Home & Childcare Centre where the occupants are vulnerable to emergency situations. (The premises/building owner, such as HDB, SLA and JTC etc shall engage the operator and see how to address the shared concerns before considering granting their lease extension application).

2

G. For applications of non-exclusive and limited religious use, the Proposer shall

liaise directly with the building owner/management to ensure their proposed usage and number of occupants for that particular room /floor does not exceed the limit as originally designed & approved for. The Proposer shall also provide the full details to the building owner/management so that the Emergency Response Plan (ERP) can be updated accordingly.

H. For new road development (including road widening, realignment, road expunction

& interim measures etc), it shall not affect or encroach upon any part of existing development compounds. For public fire hydrant, do liaise with PUB directly for any proposed relocation or erection of new fire hydrant.

I. For drainage system development (including widening, realignment, extension &

interim measures etc), it shall not affect or encroach upon any part of existing development compounds.

2. Before making any commitment (purchase/occupation or rental/lease etc) or

commencement of any proposal, the Proposer shall engage Qualified Person (QP) to carry out a feasibility study to ensure the entire premises and new proposals are able to comply with all the Fire Safety requirements (the current Fire Code & other relevant standards/guidelines/circulars). The feasibility study shall also ensure those existing fire safety provisions of surrounding developments are not affected. The QP will then assist them to obtain the FSSD's Plan Approval and the Fire Safety Certificate (FSC). If the Proposer has any doubts or queries regarding the fire safety requirements or plan approval procedures, he shall visit the FSSD at SCDF Headquarters, 91 Ubi Ave 4, for a walk-in consultation.

3. For projects involving petroleum and flammable materials (P&FM) such as Chemical

Plants, Petroleum Refineries and Buildings/Structures used for handling &storage of bulk P&FM etc (e.g. for petrol station or CNG station, the 25m buffer zone shall be observed strictly), the Proposer and their QP shall provide the overall layout details to FSSD at SCDF Headquarters at 91 Ubi Ave 4, for further comments, as additional fire safety provisions and mitigation measures will be imposed. The Proposer and their QP may wish to consult MAJ Bryan Ng (Email: [email protected]) from the HazMat Department (HAZ/SCDF) for a consultation session.

Annex E

SUNG

EI TE

NGAH

ROA

D

SUNG

EITE

NGAH

ROAD SUNGEI TENGAH ROAD

SUNGEI TENGAH ROAD

5051

15m D.R.

15m D.R.

92.5m D.R.

15m D.R.

15m D.R.

60m D.R.

81

78

77

MK11

-0372

6N

MK11-02580N

MK11-02577N

MK11-02578X

MK11-02582L

MK11-02579L

MK11

-0258

1X

MK11

-0239

6T

MK11-03594A

MK11

-0259

5X

MK11-02583C

MK11-03689M

MK11

-0235

5X

MK11

-0220

7M

MK11-03695P

MK11-03444K

MK11-03693W

MK11

-0369

4V

MK11

-0369

0L

MK11

-0363

1W

MK11

-0342

3V

MK11-02263A

MK11-03688C

MK11-03527P

MK11-02156T

MK11

-0344

7L

-

SCALEDRAINAGE INTERPRETATION PLANTHE INFORMATION GIVEN ON THIS DRAINAGE INTERPRETATION PLAN FORMS THE BEST INFORMATION AVAILABLE ON THE DATE PRINTED AND IS LIABLE TO CHANGE WITHOUT NOTICEWHILST EVERY ENDEAVOR IS MADE TO ENSURE THAT THE INFORMATION PROVIDED IS CORRECT, THE PUBLIC UTILITIES BOARD DISCLAIMS ANY LIABILITY FOR ANY DAMAGE OR LOSSTHAT MAY BE CAUSED TO ANY PERSON DIRECTLY OR INDIRECTLY AS A RESULT OF ANY ERROR OR OMISSION.Caution:The information given is indicative only. The Applicant is advised to verify the information at the site.

LEGEND :(in A1 Size)

1:750Drainage Reserve

US2NAF1

Text Box

Annex E

Annex F

Annex F

23

Details on marking of water pipes and submission of plans (from PUB)

1.1 The positions of all the water pipes as shown in Annex F-1 are approximate

only. Please determine by means of trial holes the exact alignment and levels of all

existing water pipe during the design stage and let us know whether they are affected

by the proposed works so that we can advise whether diversion is required. If

diversion is required for water pipes of 300 mm dia and below, consultation must be

made at least 6 months ahead. Diversion of our existing water pipes of 500 mm and

above, being our vital water pipes should be avoided unless absolutely necessary. If

diversion of water pipes is required, the Successful Tenderer shall carry out the

diversion works of PUB existing water pipes at your own cost and according to PUB

requirements. This is to enable developers/professionals to have better control of its

own schedule of work and ultimately timely delivery of their projects. You will need to

engage a qualified contractor to carry out the diversion work. The Successful

Tenderer is required to restitute all or some pipelines affected by the development

with new pipelines of suitable sizes, alignment and linkup points, etc. as directed by

PUB, to ensure the water supply network resiliency is not compromised. PUB will

work together with the developing agencies/professionals for them to carry out the

diversions especially for diversions within their developments.

1.2 No structure either permanent or temporary may be erected over or within 1 metre

from our water pipes. Our buried water pipes require a minimum cover of 1 metre,

and the developer must provide adequate protection for our water pipes should the

cover be removed or reduced.

1.3 No services shall overcross or be erected over any water pipes. Where a cable, pipe

or drain undercrosses a water pipe, a clearance of 1 metre is required. No manhole

is allowed on top of any water pipes. There must be a horizontal clearance of 1 metre

between the manhole and water pipes.

1.4 The developer shall take all necessary precautions to safeguard and to avoid damage

to all water pipes. The cost of repairs to any water pipe damaged as a result of work

carried out is to be borne by the party who caused the damage. The party will also

be required to indemnify the PUB against all losses and claims arising from damage

to water pipe. The party will also be billed for the estimated quantities of water loss

from the damaged pipe. PEs/QPs/Contractors shall comply with the

requirements stated in the prevention of damage to PUB water pipes in the

Annex F-2 “PUB-WSN Advisory Notes”.

1.5 Under the Public Utilities (Protection of Water pipes infrastructure) Regulations 2017,

PEs/QPs/Contractors shall make a submission to PUB(WSN) for specified activities

carried out within the protection corridor of the water pipes prior to the

commencement of works. For water pipes < 300mm dia, notification to PUB(WSN)

with the required documents indicated in Pg. 2 of Annex F-2 will suffice. For water

pipes ≥ 300mm dia, approval from PUB(WSN) is required prior to the commencement

24

1.6

1.7

1.8

1.9

Annex F

of works. Failure to comply will be guilty of an offence. Any person who is guilty of an

offence under the Regulation shall be liable on conviction to a fine not exceeding

$10,000 and, in the case of a continuing offence, to a further fine not exceeding $250

for every day or part of the day during which the offence continues after conviction.

The protection corridor for water pipe is provided in Annex F-3. Submission

of specified activities shall be made via email to [email protected]

or PUB’s Online Submission Portal, Protection of Water and Sewer pipes (POWS).

The website for POWS is as follow: http://bpu.pub.gov.sg/pows.

In general, care should be exercised to prevent any damages to our water pipes and

appurtenances. We draw your attention to Section 57 of the Public Utilities Act which

stipulates a duty to enquire on water pipes before any person digs, bores, trenches,

grades, excavates, tunnels or breaks any ground with any mechanical equipment,

tool or explosive. We also wish to highlight that under Section 47A of the Public

Utilities Act, any person who, whether wilfully or otherwise, removes, destroys or

damages or causes or permits to be removed, destroyed or damaged, any water

pipes belonging to or under the management or control of the Board, shall be guilty

of an offence and shall be liable on conviction to a fine not exceeding $40,000 or to

imprisonment for a term not exceeding 3 months or to both; or if the water pipes is

300 mm or more in diameter, to a fine not exceeding $200,000 or to imprisonment for

a term not exceeding 3 years or to both. For more information of the Public Utilities

Act, please refer to https://sso.agc.gov.sg.

Our water pipe and connections must be accessible for maintenance and repair

works at all times.

Our water pipe valve chambers and appurtenances shall not be covered over.

Our water pipe shall not be subjected to more than 15 mm/s peak particle velocity for

any work to be carried out in the vicinity of our water pipe and appurtenances.

1.10 Please inform our 24-hour Water Service & Operations Centre at Telephone No.6521

6488 immediately in the event of damage to any water pipe.

1.11 The design of the internal water reticulation system shall comply with the Public Utilities

(Water Supply) Regulations, Singapore Standard 636 - Code of Practice for Water

Services and all other relevant statutory requirements. The modes of water supply to

be adopted are as follows:

S/n Height of Highest Fittings

Above Mean Sea Level

Method of Supply

i) Less than 25 metres Direct





https://sso.agc.gov.sg/

https://sso.agc.gov.sg/

Annex F

25

ii) Above 25 metres but below *37

metres

Indirect supply through high level

storage tanks

iii) Above 37 metres Indirect supply through low level

tank with pumping to high

level tanks

(* Refers to height of inlet pipe to high level storage tanks)

1.12 Notwithstanding the above modes of supply, where water is essential for the

operations of the proposed development, storage tanks of capacity equivalent to 1

day’s water requirements shall be provided for the purpose of maintaining a

continuous supply of water in the event of supply interruptions.

1.13 Where pumping system or storage tanks are required for the water services, a

Professional Engineer must submit the Notification of WSI Works together with a set

of drawings to PUB(WSN). If all the fittings in the water service installation are

receiving direct water supply from PUB mains, then a licensed plumber shall be

engaged to submit the Notification of WSI Works and a set of the drawings to

PUB(WSN) prior to commencement of the installation work.

1.14 PUB is presently supplying NEWater for direct non-potable purposes such as for

cooling towers, industrial processes, general washing, landscaping, and other non-

potable purposes. All new non-domestic premises such as commercial and industrial

developments, etc., including those existing premises undergoing addition/alteration

works where it is applicable to use NEWater, are therefore required to provide a

dedicated NEWater pipe system now to facilitate the supply NEWater when it

becomes available in future. Provision shall also be made for a NEWater storage

tank to be installed within the premises with its inlet not higher than 115 mRL and a

capacity equivalent to the 1 day’s non-potable water requirement. There shall be no

cross connection between the PUB water and NEWater supply

pipelines. Developers/ consultants may consult PUB during the pre-planning stage

on the detailed requirements.

1.15 Water conservation measures as stipulated in the Public Utilities (Water Supply)

Regulations and SS 636 – Code of Practice for Water Services shall be adopted.

1.16 Since April 2019, PUB has mandated the sale, supply and installation of at least 2-

tick water fittings in all new and existing premises undergoing Addition & Alteration

works. The proposed development should obtain the Water Efficient Building (Basic)

Certification by PUB.

1.17 Unless with written permission by PUB, fixed or movable sprinklers are not allowed

to be used to deliver any form of water supplied by PUB, including potable water,

NEWater, raw water, effluent water, industrial water for watering any garden, lawn or

other land including commercial market gardens, commercial nurseries, sports

Annex F

26

grounds, golf courses, race courses, public and club tennis courts. Where possible,

developers are encouraged to use drought tolerant plants.

1.18 For non-domestic developments with estimated water requirements at least 5,000

m3/mth, and government developments with estimated water requirements at least

3,000 m3/mth, private water meters in accordance to PUB's requirements to monitor

water usage in the key areas as stipulated in the Fourth Schedule of the Public Utilities

(Water Supply) Regulations shall be installed.

1.19 Wherever possible, alternate sources of water (such as industrial water, high grade

industrial water, sea water, recycled water, rainwater and AHU condensate etc.)

should be used to meet the non-potable water requirements of the proposed

development.

1.20 Wherever possible, water recycling system should be set up to reclaim water for

reuse for non-potable purposes such as production process, toilet flushing, irrigation

and as cooling tower make up water, etc.

1.21 Use non-water cooled systems (such as air-cooled, refrigerant-cooled, etc.) for

cooling purposes wherever possible.

1.22 Cooling towers should achieve minimum 7 and 10 Cycles of Concentration (COC)

using potable water and NEWater respectively.

Annex F-1

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ISSU ED TO SFADATE: 10/1/2020DONE BY: KARIM J

The p la n a nd the inform a tion c onta ined herein is p rivileged a nd is givensolely to the intend ed rec ip ient for the sp ec ific p urp ose in whic h the p la nis given. No p a rt of the p la n sha ll b e rep rod uc ed or c irc ula ted to othersund er a ny c irc um sta nc es.The inform a tion of the wa term a ins on this p la n is va lid a s a t d a te p lotteda nd is given without a ny lia b ility for a ny error, m is-sta tem ent or om issiontherein.

Position of wa term a ins a nd the b ound a ry lines of the wa ter c a tc hm entind ic a ted on this p la n a re a p p roxim a te only. Sm a ller sub m a ins a ndc onnec tions to custom ers’ p rem ises/p rop erties a re not ind ic a ted . Tria lholes m ust b e c a rried out to d eterm ine the exa c t a lignm ents a nd levels ofa ll wa term a ins b efore c om m enc em ent of a ny ea rthworks.

The c ost of d iversions, if required , of a ny wa term a ins sha ll b e b orne b yowner / d evelop er. For wa term a ins of 500m m d ia m eter a nd a b ove, thesea re our vita l trunk m a ins a nd d iversions should b e a void ed unlessa b solutely nec essa ry. Owner / d evelop er sha ll d eterm ine b y m ea ns oftria l holes the exa c t a lignm ent a nd levels of a ll existing wa term a ins d uringthe d esign sta ge a nd let PU B know whether they a re a ffec ted b y thep rop osed work so tha t PU B c a n a d vise whether d iversion is required . Ifd eem nec essa ry b y PU B, the a ffec ted wa term a ins sha ll b e d iverted a ndthe c ost of d iversion sha ll b e b orne b y owner / d evelop er. The c ost ofd iversion sha ll b e fina lized up on c onfirm a tion on the length of wa term a insa ffec ted .

All other nec essa ry p rec a utions m ust b e ta ken to sa fegua rd a nd to a voidthe d a m a ged to the wa term a ins. The c ost of rep a irs to a ny wa term a insd a m a ged a s a result of work c a rried out is to b e b orne b y p a rty whic hc a uses the d a m a ge. The p a rty will a lso b e b illed for the rep a ir of them a ins a nd the estim a ted qua ntities of wa ter lost from the d a m a gedm a ins. The p a rty will a lso b e required to ind em nify PU B a ga inst a lllosses a nd c la im s a rising from d a m a ge to wa term a ins.

Plea se inform PU B 24-hour Ca ll Centre a t Tel No 1800-CALL PU B (1800-2255782) im m ed ia tely in the event of d a m a ged to wa term a in.

1.

2.

3.

4.

5.

6.

PUB Potable Water Mains

US2NAF1

Text Box

Annex F-1

Annex F-2

To: Agencies/ Developers/ Qualified Persons/ Contractors PUB (WSN) ADVISORY NOTE- PREVENTION OF DAMAGE TO WATERMAINS Our records show that there are existing watermains within and in the vicinity of your development lot. The Developer / Contractor is required to notify/obtain a written clearance from PUB (WSN) before carrying out any earth work/ piling work/ building work at the site, satisfying all the Conditions and Requirements set hereunder. Works within the protection corridor of watermains < 300mm diameter require only a notification. There is no necessity to await PUB’s response upon notification with the required declaration (Appendix 4) and supporting documents (1.A to 1.E) before commencement of work.

For works within the protection corridor of watermains ≥ 300mm diameter, PUB will review the submissions within 14 working days, and if the declaration (Appendix 4) and all the documents (1.A to 1.E) are in order, grant in-principle clearance for the Works. NO WORKS ARE TO COMMENCE UNTIL CLEARANCE HAS BEEN GRANTED BY PUB, to do so. Penalties under PUB Act/ Regulations We would like to draw your attention to Section 57 of the Public Utilities Act which stipulates a duty to enquire on water mains if any person wishes to carry out any work in the vicinity of watermains. We wish to highlight that under Section 47A of the Public Utilities Act, any person who, whether wilfully or otherwise, removes, destroys or damages or causes or permits to be removed, destroyed or damaged, any watermains belonging to or under the management or control of the Board, shall be guilty of an offence and shall be liable on conviction to a fine not exceeding $40,000 or to imprisonment for a term not exceeding 3 months or to both; or if the watermains is 300 mm or more in diameter, to a fine not exceeding $200,000 or to imprisonment for a term not exceeding 3 years or to both. Under the Public Utilities (Protection of Water Pipes Infrastructure) Regulations 2017, which stipulates that for water pipes smaller than 300mm, the QP/PE/contractor shall notify PUB before commencement of the works. No approval by PUB is needed. For water pipes equal to or larger than 300mm, the QP, PE or contractor shall submit an application to PUB and obtain PUB’s approval before commencement of works. Any person who is guilty of an offence under the Regulation shall be liable on conviction to a fine not exceeding $10,000 and, in the case of a continuing offence, to a further fine not exceeding $250 for every day or part of the day during which the offence continues after conviction. For more information of the Public Utilities Act and Regulations, please refer to http://statutes.agc.gov.sg/.

http://statutes.agc.gov.sg/

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Annex F-2

Mandatory requirement before commencement of works Our records show that there are existing watermains within and in the vicinity of your development lot. A copy of the Watermains Plan is attached, for your reference ONLY. Where the proposed works are to be carried out within a watermain corridor (see para 4. A and 4. B), the Developer/ Contractor shall notify and obtain the written approval from PUB before the carrying out of any activity. The below requirement are deemed necessary and must be carried out by you, failing which PUB’s clearance will not be granted:

1.A Declaration form by QP. Refer to Appendix 4.

1.B Detailed method statement and drawings for the construction works, details of the machinery/equipment used with analyses / assessment to demonstrate that the construction method proposed will not cause any impact or damage to the watermain. Include PE endorsed design for the support of watermain and joints in case of the necessity to exposure the watermains (see para 6. G).

1.C Construction Impact Assessment Report (CIAR) - The QP is to carry out a construction impact assessment of the construction effects of the works on the watermains in the vicinity of the works and submit the report to PUB. Refer to para 6. B for detail.

1.D Instrumentation and monitoring plan of all the watermains that in the QP’s view are likely to be affected by the works. Refer to para 8. A to H for detail.

1.E PUB would require the owner/developer/contractor to install surveillance cameras for works within watermain setback distance (see para 3. B) for watermains ≥ 900mm diameter (see para 9. A and B).

Who to make the submissions for the proposed works to PUB(WSN) Before commencement of works, the owner/developer shall engage a Qualified Person to undertake the design and make and endorse all submissions to PUB. For activities requiring BCA approval

• the QP is the PE appointed by the contractor/person carrying out activity For activities not requiring BCA approval

• the QP is the PE appointed by the contractor/person carrying out activity, or

• contractor/person carrying out activity where PUB has dispensed the need for PE

The Professional Engineer shall have registered with the PE Board, Singapore and possess a valid practicing certificate.

How to make the submissions for the proposed works to PUB(WSN) Submissions shall be made via email to [email protected] or via PUB’s Online Submission Portal, Protection of Water Pipes and Sewers (POWS). POWS serves as a centralised portal for processing of submissions by Qualified Persons/Professional Engineers/Contractors prior to carrying out specified activities near water pipes and public sewers.

The link to POWS is as follows: https://bpu.pub.gov.sg/pows.

SingPass login is required to access the portal.

Contact for Enquires on the submission to PUB(WSN)

For submissions/enquiries on protection of water pipes, you may send an email or call the following officers:

Potable Water/NEWater/Industrial Water pipelines at Northern & Eastern areas – Mr Delvis Chew at [email protected] or DID 96604443

Potable Water/NEWater/Industrial Water pipelines at Central & Western areas – Mr Chu Guang Sing at [email protected] or [email protected] or DID 82988420

Raw Water pipelines – Mr Roderick Ho at [email protected] or DID 65172916

General enquires – [email protected]


https://bpu.pub.gov.sg/pows






Appendix 1

Duty and Responsibility to locate and positively identify PUB watermains 2. A The information of the watermains on this plan is valid as at date plotted and is given without any liability for any error, mis-statement or omission therein. Positions of watermains as shown in the plan are approximate only. Smaller submains and connections to customers' premises /properties are not indicated in this PLAN. 2. B The exact locations and depths of all watermains (including the smaller submains and connections), must be positively identified by you on site by means of trial holes conducted using manual excavation. The presence of water meters nearby indicate the presence of connections and these pipes shall be positively identified on site by trial holes. The alignment of the watermains must be pegged on site, so that the alignment is clearly visible and appropriate protection measures can be adopted. 2. C Do have proper protection for our existing watermains during excavation. PUB’s watermains are not to be exposed, suspended or otherwise interfered with without prior approval from PUB. All exposed watermains should have a PE’s certification on the design for supporting the existing watermains. 2. D Our watermains and appurtenances must be accessible for maintenance and repairs at all times. All chambers and appurtenances within the construction site should be clearly demarcated, suitably protected and hoarded up. Under no circumstances, shall any earth spoil or debris or any construction activities cover our chambers and appurtenances. All other necessary precautions must be taken by the contractor to safeguard and to avoid the damage to the watermains. 2. E The alignment of the watermains must be pegged on site, so that the alignment is clearly visible and appropriate protection measures can be adopted. You shall reconfirm the alignment of the watermains before reapplying missing or faded pegs and surface markers on the ground or inside trench. 2. F You shall update the peggings / markings at the worksite after the carrying out of any watermain diversion, decommissioning of watermains or commissioning of new watermains. You shall brief all worksite personnel of the new positions of the watermains. 2. G Trial trenches conducted may not locate the watermains, as shown on the plan. This does not mean that the watermain is not there. The watermain may be the deeper than the depth of the trail holes. The Developer/ Contractor shall then undertake geophysical or other methods to positively identify and locate all the watermains, shown on the plan.

2. H Please contact PUB officer in-charge for assistance if you are unable to detect the exact locations of the watermains on site. General Requirements 3. A No structure, including rigid pavement either permanent or temporary shall be erected over our watermains. Our buried watermains require a minimum cover of one metre, and you must not at any time increase, reduce or remove this, without our approval. The Developer/ Contractor is required to provide adequate protection for our watermains. 3. B No structure either permanent or temporary shall be erected over or within the below minimum setback distance from the watermain. WATERMAIN SETBACK DISTANCE CLEARANCE REQUIRED

Watermain Diameter (mm)

Nett Clearance Required

100 to 600 (depth ≤ 3m)

1.0m from outer edge of any structure to centreline of water pipe

100 to 600 (depth > 3m to 5m)


150 to 600 (depth > 5m)


> 600 to 1500 2.5m from outer edge of any structure to outer edge of water pipe

> 1500 to 2200 3.0m from outer edge of any structure to outer edge of water pipe

> 2200, Tunnels or Tunnelled pipes

4.0m from outer edge of any structure to outer edge of water pipe

3. C All services must undercross our watermains. Services undercrossing our watermains shall be protected throughout the entire width of the undercrossing section and a minimum clearance of 1 metre all-round the pipe must be provided. 3. D No heavy machinery or vehicles shall be driven over PUB watermains. Where vehicles need to cross any existing watermains, adequate protection would have to be installed e.g. use of steel plates over the ground with sufficient earth cover of 1m minimum, above the pipes for load distribution during construction access. There shall be no stacking and storage of materials or parking of vehicles directly above the watermains.

3. E PUB will not be held responsible for any damage or injury caused to any persons, property, road, etc as a result of watermain leakage due to the Developer/Contractor’s works. The Developer/Contractor shall be fully liable for any damage caused to adjacent property whether public or private as a result of any leakage from the watermain due to his works. The Developer/Contractor shall undertake all repairs to the adjacent property at his own costs and reimburse the owners directly for any consequential claims or expenses claimed by them. The Developer/Contractor will also be required to indemnify PUB against all losses and claims arising from damage to watermains. Verification of Proposed Works within Watermain Corridor

4. A After positively identifying existing watermains on site (including its depth and alignment), the Developer/ Contractor shall assess whether if the proposed works lie within the water main corridor, as indicated in the Table below. 4. B The water main corridor as set by PUB, is the distance between two vertical planes, on either side of the centreline of any watermain, as specified in the table below.

Water Pipe Distance X on either side from the centreline

<900 mm Diameter 10 metres

> 900mm Diameter 20 metres

Tunnels and Tunnelled

pipes

40 metres

Watermains Diversion for Proposed Works within Watermain Corridor 5. A The Developer / Contractor shall consult PUB at the earliest opportunity during the design stage on the handling of the affected watermain. The Developer / Contractor shall arrange for site meetings with PUB to seek PUB’s comments on whether the affected watermain should be diverted or remain in its original position with adequate protection measures implemented. If deemed necessary by PUB, the affected watermain shall be diverted out of the watermain corridor and the Developer / Contractor shall be responsible for engaging a Licensed Plumber / Contractor to carry out the diversion works according to PUB’s pipe-laying specifications. If PUB deems that diversion of the affected watermain is not feasible, the Developer / Contractor shall make necessary modifications or design changes to his works such that the watermain is either no longer affected or adequately protected by appropriate measures. 5. B If PUB deems that that the proposed works (whether within or outside of the watermain corridor) impose risks or constraints on the future operation, maintenance or repair of the watermain, PUB may direct the Developer/ Contractor to divert the watermain or make necessary modifications or designs changes to his works. 5. C In general, watermains of 500mm in diameter and above are considered critical and shall not be diverted unless absolutely necessary. 5. D The cost of all abovementioned diversions, modifications and design changes to proposed works, as PUB may direct, shall be borne by the Developer / Contractor. Responsibilities Required from Qualified Persons 6. A The developer/contractor’s QP shall submit for the information of PUB the procedures and methods for all excavation and other construction works within the entire corridor of the watermains to prevent damage to the watermains during the work. See para 1. A to 1. E. 6. B Construction Impact Assessment Report (CIAR) - The QP is to carry out a construction impact assessment of the construction effects of the works on the watermains in the vicinity of the works and submit the report to PUB. The report shall include the following details:

(i) The ground conditions, geotechnical profiles and relevant borehole logs. (ii) The proposed construction equipment and methods, and sequencing of

construction. (iii) Assessments on the use of the proposed construction equipment

/methodology on the existing watermain, vibrations, ground displacements

and groundwater draw downs and how the impacts would be mitigated to meet requirements. (See para 6. C to F)

(iv) The damage potential and risks to the watermains. (v) Preventative and precautionary measures to protect the watermains from

damage and remedial measures to be taken in the event of damage/incidents.

6. C Equipment Vibrations - Construction activities such as piling, excavation, soil improvement, diaphragm wall and retaining wall construction etc and the use of construction equipment such as piling/boring machine etc shall not subject the watermain to a peak particle velocity (PPV) exceeding 15 mm/s at any frequency. The QP shall provide a detailed impact assessment that clearly demonstrates the vibration attenuation for each of the equipment proposed to be used at the development site and in similar ground conditions to show that this vibration limit would not be exceeded on the existing watermains. 6. D Groundwater Drawdown – The developer/contractor’s QP shall confirm that there will not be any groundwater drawdown in the vicinity of the PUB watermain. If there is drawdown of groundwater, the developer/contractor’s QP shall propose mitigation measures. 6. E For Cement-lined Steel and Cement-lined Ductile Iron pipes: In general, the allowable limits are as follows:

1. longitudinal deflection – not exceeding L / 250 or 20mm whichever is lesser, where L is defined as the calculated length of sagging pipe section, at ends of which there will be no expected horizontal nor vertical movement.

2. diametrical deformation – not exceeding 2% of the pipe diameter 3. The total stress on the pipe at any point (including existing stress and additional

stress due to the proposed works) shall not exceed 133 N/mm2.

6. F For Cement-lined Cast Iron Pipes (with lead-caulked pipe-joints): All cast iron pipes are assumed to take zero longitudinal deflection and zero diametrical deformation. This is because existing cast iron pipeline are old and due for replacement. They cannot be subject to any additional loading/ stresses. Development near a cast iron pipeline must be designed to prevent any increase in stress / strain to the pipeline. 6. G If water pipes are required to be exposed and supported to facilitate construction works, QP needs to provide PE endorsed design for the utility support. The watermain should be supported by box-in structural design that can fix the pipe rigidly on all 4 sides to prevent movement/deflection of the water main, especially at the spigot & socket or welded joint positions. Please provide wooden wedges or rubber shins in between the supports and pipe to further prevent any movement and

damages to the pipes once the metal supports are in place. Extra precaution should be taken at the pipe bends due to additional thrust force at pipe bends. 6. H You shall not dig any trial holes in the vicinity of watermains without the written consent from PUB. You shall comply with any additional requirements that may be imposed by PUB. 6. I The QP shall advise PUB on the likely risk to the watermain and his proposed mitigating measures for preventing the water mains from damage to the satisfaction of PUB. 6. J If there are changes to the schedule for the carrying out of the work or changes in the work method, the QP shall study the implications, review the earlier impact assessment that had been carried out and promptly notify PUB if there are any changes to such earlier assessment. Good Practices at Worksite 7. A You should provide full-time site supervisor to monitor the worksite operations for the entire duration of any work. You shall ensure that the site supervisor is familiar with these requirements. 7. B You shall ensure that daily site briefings with all worksite workers are conducted (in languages that are understood by all workers) to remind them about the location of the watermains and the measures to be taken to prevent damage to the watermains. You shall keep records of such daily briefings (which shall include but are not limited to date and time, venue and person conducting the briefings, contents of briefings and the list of worksite workers who have attended such briefings). You shall also disallow any worksite worker who has not attended such briefings from being involved with any part of the intended work. New staff must be briefed before they start work. 7. C You shall inform PUB officers of the identity of the Worksite management/ QP(S)/ Provisional Registered Excavator Operator (PREO)/ Registered Excavator Operator (REO), the proposed methods of carrying out of the work and/ or location of the proposed work. You shall also inform PUB officers if there are any changes to the above. 7. D You shall ensure that information on the presence of watermains in the vicinity of the worksite and all mitigation measures to be taken to prevent damage to such watermains have been communicated and adhered to by all personnel of all working levels in the project team, including sub-contractors and any third party who are in any way involved with any part if the intended work.

7. E You shall contact PUB if you find any live or abandoned watermains in the course of carrying out any work at the worksite which have not been shown in the Water Service Plan. 7. F You shall provide adequate lighting if the work are to be carried out at night. 7. G You shall engage only a REO or PREO to operate a powered mechanical excavator. 7. H You shall ensure that powered mechanical excavation is only used, under the close standing supervision of a full time site supervisor, when working near or above any watermain. 7. I You should implement a PTW system to monitor and ensure that all Earthworks are properly tracked and controlled if such Earthworks are to be carried out in the vicinity of watermains. Under the PTW system, such Earthwork shall be approved by the manager of the project or his authorised deputy. You shall periodically audit the PTW system for its effectiveness. Instrumentation and Monitoring 8. A The QP shall include in the monitoring plan of all the watermains that in his view are likely to be affected by the works. 8. B The QP’s method statement shall include the proposed monitoring intervals and all requirements imposed by PUB. 8. C The QP shall be responsible for ascertaining and setting the safe limits (including alert level and work suspension level) of ground movements, vibration levels or other changes for ensuring the structural integrity and proper functioning of all watermains. He shall provide comprehensive basis for the proposed safe limits. See para 6. C to F. 8. D The QP shall verify and certify by monitoring that the permissible limits set for deformation and vibration are not exceeded. 8. E It shall be clearly understood that the submissions of the instrumentation monitoring results and reports to PUB are only for PUB’s information. The QP shall be fully responsible for the analysis and interpretation of all the readings and measurements and for taking all remedial measures where necessary. When abnormal readings or measurements are obtained, QP shall immediately investigate the causes of the abnormalities and take all necessary remedial measures. QP shall promptly

inform PUB should such abnormalities be likely to affect the structural integrity of the watermain. 8. F Instrumentation monitoring regime consists of inclinometers, ground settlement markers, vibration meters, piezometers, strain gauges, rod extensometers, etc. shall be carried out by QP to check whether ground movements & vibration impacts are within allowable limits during the construction works. Records of the instrumentation monitoring regime shall be endorsed by the QP and properly maintained at the site, submitted to PUB or made available for inspection by PUB upon request. See para 6. C to F 8. G The QP shall monitor and review the instrumentation monitoring results daily, looking out particularly for excessive ground movements that may cause damage to the watermains. The QP shall submit the instrumentation monitoring records to PUB weekly or at a frequency otherwise stipulated by PUB. QP shall highlight in his submission if there are any excessive ground movements monitored or any other abnormalities. 8. H The QP shall stop the works immediately if the instrumentation monitoring results exceed the allowable limits and inform PUB immediately. The QP shall assess the impact on the watermain and submit a report and proposed mitigation measures to PUB.

Appendix 2 Additional Requirements for submission prior to Commencement of Works 9. A PUB would require the owner/developer to install surveillance cameras for works within watermain setback distance (see para 3. B) for watermains ≥ 900mm diameter:

(i) Owner/developer shall provide web-based IP surveillance cameras to continuously monitor construction activities in the vicinity of the large diameter (≥ 900mm) watermain. The number of cameras to be provided shall be approved by PUB and shall be sufficient to cover the entire corridor of the watermains.

(ii) The surveillance cameras must be able to capture still pictures and perform continuous video recording.

(iii) The owner/developer shall provide PUB with the Internet website address for centralized viewing of the still picture and video recordings of the construction activities above PUB watermains captured by the surveillance cameras.

9. B The owner/developer is required to submit their proposed designs and notify / obtain an approval from PUB before commencement of the works.

Protection of Watermains from Damages 10. A Please inform PUB 24 hours Call Centre at Tel No. 1800-CALL PUB (1800-2255 782) immediately in the event of damage to a watermains. 10. B You and/ or your workers shall not attempt to repair or modify any damaged watermain. 10. C Please take all necessary measures to prevent damage to our watermains and appurtenances in the course of your work. I have attached a copy of the "DOs and DON’Ts” (see Appendix 3), which provides the details on the protection requirements for proposed works carried out in the vicinity of our water mains, for your compliance. 10. D PUB shall be entitled to ask you to stop work with immediate effect in the event of non-compliance to this Advisory. PUB shall not be liable to you in any way for any losses, claims or damages arising from or in connection with such stop work requests. 10. E You shall comply with any requirements as reasonably prescribed by PUB in PUB’s review and endorsement of the relevant method statement and any other documents submitted by you in relation thereto for the work.

10. F The cost to repair any watermains damaged as a result of work carried out is to be borne by the party which causes the damage. The party will also be billed for repair of the mains and the estimated quantities of water lost from the damaged main. The party will also be required to indemnify PUB against all losses and claims arising from damage to watermains. Other Administrative Notes 11. A These requirements are applicable to all persons who carry out any work and strict compliance is required, unless otherwise permitted in writing to PUB. Please consult PUB, if necessary. 11. B The requirement stated above are not exhaustive. Additional requirements may be issued from time to time by PUB. These additional requirements, together with the requirements in this Advisory, shall form the full list of requirements that must be complied with at all times. You are advised to carry out all necessary assessment and take all necessary precautions to prevent damage to any existing watermains.

Appendix 3 DOs AND DON’Ts WHILST WORKING IN THE VICINITY OF WATERMAINS DOs

1 Do write in to PUB, Water Supply (Network) Dept for the latest watermains plans.

2 Do trial holes to identify the exact location of existing watermains. 3 Do use manual excavation especially near watermains. 4 Do use pipe locators with the assistance of valve chambers and hydrants

to identify the location of existing watermains. 5 Do consult PUB, Water Supply (Network) Dept on the location of the

existing watermains when you are unable to locate them. 6 Do lay services such as cables, pipes with a separation distance of one

meter from PUB existing watermains. 7 Do have proper protection for our existing watermains during excavation (PE certification on design of supporting existing watermains is required). 8 Do peg the alignment of the watermains within the worksite clearly with

signages/visible markers. 9 Do install instrumentation (eg. ground settlement markers, vibration

meters to be placed at site to monitor the impact of soil movement/ vibration to PUB water mains) for monitoring at the site.

DON’Ts

1 Don’t allow heavy machinery to move over PUB watermains without adequate protection (eg steel plate).

2 Don't use excavator for trial holes to locate the existing water mains when near them. The last 0.5m must be checked by use of probes and manual excavation.

3 Don't lay sewer pipes on top of our existing watermains. 4 Don't construct any structures on top of our existing watermains. 5 Don’t allow our valve chambers to be covered over with construction

debris especially at worksites. Contact PUB, Water Supply (Network) Dept for PUB valve chambers at worksites to be raised to prevent them from accidentally being covered over. Our watermains and connections must be accessible for maintenance and repair works at all times;

6 Don’t expose our watermains without prior approval from us. 7 Don’t erect any structure either permanent or temporary over or within

one metre from our watermains. Our buried watermain requires a minimum cover of one metre, and you must provide adequate protection for our main should the cover be removed or reduced by your works.

Appendix 4

Declaration by Qualified Person for Specified Activity

within Water Pipe Protection Corridor

Particulars of Qualified Person

Name : _________________________________________________________________

Role in Project : __________________________________________________________

Reference Number : ________________________________________________________

Firm Name : ______________________________________________________________

Firm Address : ____________________________________________________________

Telephone Number : ________________________________________________________

Extension : ________________________________________________________________

Mobile Number : ____________________________________________________________

Email Address : _____________________________________________________________

I confirm that:

(1) I am the qualified person for the project/ works.

(2) All the existing and proposed buildings/ structures, piling works including temporary works for

excavation and all the proposed and existing PUB water pipes are shown in the plans submitted

with this application.

(3) The proposed development/ works/ building/ structure is not directly over or above any PUB water

pipe or encroached on any minimum setback distance between structure and water pipes as

stipulated in the Code of Practice for Water Services or PUB (WSN) Advisory: Prevention of

Damage to Watermains.

I will comply with PUB’s requirement on “PUB (WSN) Advisory: Prevention of Damage to Watermains”

I also declare that I will take every practical measure to ensure that the proposed development/ works will

not disrupt or affect any existing PUB water pipe. I will not commence any temporary work/ piling work/

building work within the pipe protection corridor for existing water pipes ≥ 300mm diameter until a written

clearance from Water Supply (Network) Department, PUB has been obtained.

I hereby confirm that the details of the proposed development/ works will be submitted separately.

_________________________________ ___________________

Name and Signature of Qualified Person Date

Particulars of Project

Project Reference Number

Project Title

Location Description [include

Lot/Plot, MK/TS, House No.,

Building Address, Road Name

and Postal Code]

Particulars of Application

Application for approval is required only for the following works (as shown in a) that are within the Water

Pipes Protection Corridor (as shown in b), and the affected Water Pipe is equal for more than 300mm

diameter (as shown in c). Application for approval is required regardless of pipe size if exposure of pipe is

required (as shown in d).

(a) Select type of works

□ Building/ structure works

□ Excavation works for any building, structure, road, railway, MRT, bridge, viaduct, flyover,

drains or sewer works, including trial trenches and soil investigation works

□ Water pipe, gas pipe, or cable laying works

□ Boring, dredging, levelling, or piling

□ Ground improvement works

□ Driving or sinking of any earth rod, casing or tube into the ground

□ Storage or placement of large construction equipment, construction materials and stockpiling

of earth or heavy objects

□ Works with potential to cause groundwater drawdown or cause soil settlement (e.g. deep

shaft excavation, tunnelling works, jacking works)

(b) Select Water Pipe Protection Corridor

□ Work is within 10m of water pipe less than 900mm diameter

□ Work is within 20m of water pipe equal or more than 900mm diameter

□ Work is within 40m of water pipe tunnel

(c) Select affected Water Pipe diameter size

□ Affected water pipe is less than 300mm diameter (no approval from PUB required)

□ Affected water pipe is equal or more than 300mm diameter (approval from PUB required)

(d) Select necessity to expose and support affected pipe for extended period of time (more than 1 day)

□ Affected water pipe will not be exposed during course of work

□ Affected water pipe need to be exposed and supported to facilitate work (approval from PUB

required regardless of pipe size)

Stage of Development Submission:

□ Pre-consultation/ Planning stage

□ BCA’s Permit to Commence Building/ Structure works obtained

□ Works to be commenced within 1 month from application

Expected commencement date: _________________

Expected completion date: _____________________

Notification/ Application for Approval of Works Affecting

PUB Water Pipes

[Under Public Utilities (Protection of Water Pipes Infrastructure)

Regulations 2017]

Attachments

This application is accompanied by: Submission

(a) For all works within the Water Pipe Protection corridor.

All the below documents as attached:

(1) Water Service Plan (WSP) showing the existing water pipes near or

within the site.

(2) Layout plan endorsed by QP showing the proposed buildings/

structure (including retaining and boundary walls and footings,

drains etc) overlaid on the WSP. The plan shall indicate the

minimum setback distance for the existing water pipes.

Yes / No

Yes / No

(b) All the following documents have been submitted:

(1) Detailed method statement and drawings for the works, details of the

machinery/equipment used with analyses/ assessment to demonstrate

that the construction method proposed will not cause any impact or

damage to the watermain.

(2) Construction Impact Assessment Report (CIAR) of the construction

effects of the works on the watermains in the vicinity of the works.

The report shall include the following details:

(i) The ground conditions, geotechnical profiles and relevant

borehole logs.

(ii) The proposed construction equipment and methods, and

sequencing of construction.

(iii) Assessments on the use of the proposed construction

equipment /methodology on the existing watermain,

vibrations, ground displacements and groundwater draw

downs and how the impacts would be mitigated to meet

requirements.

(iv) The damage potential and risks to the watermains.

(v) Preventative and precautionary measures to protect the

watermains from damage and remedial measures to be taken

in the event of damage/incidents.

(3) The CIAR must show that the following parameters (if applicable)

satisfy PUB’s requirement:

(i) For cement-lined Steel and Cement-lined Ductile Iron pipes

o longitudinal deflection – not exceeding L / 250 or 20mm

whichever is lesser, where L is defined as the calculated

Yes / No

Yes / No

Yes / No

length of sagging pipe section, at ends of which there

will be no expected horizontal nor vertical movement.

o diametrical deformation – not exceeding 2% of the pipe

diameter

o The total stress on the pipe at any point (including

existing stress and additional stress due to the proposed

works) shall not exceed 133 N/mm2.

(ii) For Cement-lined Cast Iron Pipes (with lead-caulked pipe-

joints):

o All cast iron pipes are assumed to take zero

longitudinal deflection and zero diametrical

deformation.

(iii) The water pipes should not be subjected to vibration of peak

particle velocity (PPV) exceeding 15 mm/s

(iv) There should not be groundwater drawdown in the vicinity of

PUB pipe. If groundwater drawdown is expected, please show

estimated result

(4) Instrumentation and monitoring plan of all the watermains that in the

QP’s view are likely to be affected by the works

(5) If water pipes are required to be exposed and supported to facilitate

construction works, QP needs to provide PE endorsed design for the

utility support

Yes / No

Yes / No

(c) Additional requirement for works within water pipe setback distance

for water pipes equal or more than 900mm diameter.

The owner/developer is required to submit their proposed designs and

obtain an approval from PUB before commencement of the works.

(1) Owner/developer shall provide web-based IP surveillance cameras to

continuously monitor construction activities in the vicinity of the

affected water pipes. The number of cameras to be provided shall be

approved by PUB and shall be sufficient to cover the entire corridor

of the watermains.

(2) The surveillance cameras must be able to capture still pictures and

perform continuous video recording.

(3) The owner/developer shall provide PUB with the Internet website

address for centralized viewing of the still picture and video

recordings of the construction activities above PUB watermains

captured by the surveillance cameras.

Yes / No

(d) Other relevant information (if any)

Yes / No

Annex F-3

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Annex F-3