INVENTORY OF WORK ACTIVITIES
RISK ASSESSMENT / ENVIRONMENTAL IMPACT ASSESSMENT
COMPANY: POH KEONG CONSTRUCTION PTE LTD / BENCO MARITIME PTE LTD
INVENTORY OF WORK ACTIVITIES
RA REF
REMARKS
1
Provision of sodium percarbonate dosing works
DATE: 15/08/2017
PROCESS
Mobilization
WORK ACTIVITY
Mobilization of machinery / materials / equipment in & out of site
REMARKS
Rev 1
Via lorry/trailer
2
General Lifting Operations
Loading & unloading machinery / materials / equipment in & out of site
Rev 1
by lorry crane
3
Manual Handling
Manual Handling of Material
Rev 1
4
General Works
General boat using for barge
Rev 1
5
General Works
Movement of barge and boat
Rev 1
6
Electric Works
Use of generator to operate electric dosing machine.
Rev 1
7
Repair and Servicing
Repair and servicing of dosing material, boat engine, generator etc. on site.
Rev 1
8
Oil Control
Operating of Oil Machine
Rev 1
9
Chemicals Handling
Handling, transport and temporary storage of the Chemicals
Rev 1
10
Weather
Working Under inclement weather
Rev 1
11
General Works
Housekeeping
Rev 1
1
Risk Assessment Form
.
Project Title:
Organisation:
PROVISION OF SODIUM PERCARBONATE DOSING SERVICES AT
RESERVOIRS AND WATERWAYS IN SINGAPORE (SCHEDULE I) /
RA Reference:
POH KEONG CONSTRUCTION PTE LTD /
BENCO MARITIME PTE LTD
Initial Assessment Start
Date:
15/8/2017
RA-2017-003-01
PUNGGOL RESERVOIRS
Project Synopsis:
Provision of Sodium Percarbonate dosing services at Tengeh Reservoir, Pandan Reservoir, Kranji Reservoir, Upper Seletar Reservoir and Sungei Peng Siang/Punggol Reservoirs
Last Review Date:
Next Review Date:
15/8/2017
CONDUCTED BY
Name
Designation
Chew Boon Keong
Supervisor
Palaniyandi Sathiyamorth
Lifting Supervisor
Impacts/
Consequence
 Fatality/Injur
y to workers
 Damage to
assets
 Insufficient
traffic
controllers
 Fatality
/Injury to
workers
 Damage to
assets
 Loads
disengaging
and falling
Fatality /Injury
to workers
Name
Engineer
Project Manager
(Name / Designation / Signature / Date)
(Name / Designation / Signature / Date)
Risk Evaluation
Existing Risk Controls
 Equipment to be driven by competent
driver with valid Singapore driving
license
 Ensure the traffic route is planed
beforehand
 Driver to check back, blind spots or any
other obstruction when moving off,
turning
 Ensure adequate number of traffic
controllers are deployed
 Only appointed traffic controllers to
guide the lorry movement
 Traffic controller to be equipped with
traffic marshalling peripherals
 Large reflective gloves
 Flashing batons
 Stop/go sign
 Provide safety signage along the gate
to create awareness for the driver
 Provide additional traffic controllers to
guide the public movement near to
vehicle access area
 Operators/supervisors to ensure all
loads are strapped down adequately
and securely
Designation
Org
Sign
Date
Risk Control
Additional Controls Measure
S
L
RPN
1
Hazard Identification
Work Activity
Environmental
Health & Safety
Hazards
Mobilization of
 Traffic
materials /
accident
machinery /
 Strike to
equipment in &
persons,
out of site Via
structures or
lorry/trail
machinery
Date
Implementation
Person
 Supervisor to monitor and
ensure all existing controls
measures are in place before and
during work
A
1
1A
All RA Member
15/8/2017
Chew Boon Keong
(Supervisor)
2A
 Supervisor to monitor and
ensure all existing controls
measures are in place before and
during work
A
1
1A
All RA Member
15/8/2017
Chew Boon Keong
(Supervisor)
2A
 Daily toolbox meeting to remind
hazards and control measures
A
1
1A
All RA Member
15/8/2017
Chew Boon Keong
S
L
RPN
Ref
REVIEWED BY
ENDORSED & APPROVED BY
CHECKED& CONFIRMED BY
Signature
14/8/2019
A
2
2A
A
2
A
2
2
Date
Action By
(Name /Designation)
from lorry
bed when
lorry in
motion
2
Loading &
unloading
Material/
Machine/
Equipment
by lorry crane
 Machineries
toppling
from trailer
- Fatality
/Injury to
workers
-Damage to
assets
 Lorry crane
on
uneven/soft
ground
 Outriggers
are not
properly
extended
Lorry crane
topple and
striking
workers and
property
resulting
Fatality /
injuries/damag
es
Materials not
properly
hooked/secure
d
Materials fall
and strike
workers
/property
resulting
Fatality
/injuries/dama
ges
Uncertified/
Faulty Lifting
machine
Lifting machine
failure and
strike workers
/property
resulting
Fatality/
injuries/damag
e
Unauthorised
entry into
lifting zone
Worker struck
by boom or
swinging load
resulting
Fatality
/injuries/dama
ge
 Banksman to direct heavy vehicle
 Banksman to ensure no one standing
alongside
 High visible vest and whistles will be
issued to banksman
 Barricade the area during unloading
process
 Machineries to be secured properly on
the trailer
 supervisors to ensure trailer parking on
firm /even ground
 provide banksman to guide the
operator during loading and unloading
 Ensure proper access is provided
 Lorry crane to park on firm /even
ground
 Steel plate to be used if ground is nor
hard enough
 outrigger to be fully extended
 Supervisors to check ground condition
before parking
 Ensure briefing of RA and SWP to site
personnel prior to commencement of
work
 Ensure lifting PTW is applied and
approved PTW is available on site for
inspection
 Competent Lifting supervisors and
rigger man to be deployed
 Ensure working area is demarcated and
authorized person to enter lifting zone
 No one is supposed to stand under the
suspended load
 Ensure lifting machine has been
inspected and certified by authorised
Examiner
 Lifting supervisor to ensure valid LM
certificates
 Lifting machine to be inspected by
machinery inspector before entry in to
HSJV site
 Only appointed operator to be allowed
 Ensure briefing of RA and SWP to site
personnel prior to commencement of
work
 Ensure lifting PTW is applied and
approved PTW is available on site for
inspection
 Only appointed lifting crew to be
deployed and to ensure no one enters
the lifting zone
 No one is supposed to stand under the
 Drivers to be briefed on access
route
 Supervisor/Safety supervisor to
ensure drivers and traffic
controllers are aware the risk,
hazards and control measures
(Supervisor)
 Unloading area to be
demarcated with warning
signage
 Brief Banksman and operator to
have a proper communication
with each other
 Daily toolbox meeting to remind
hazards and control measures
 Supervisor to monitor and
ensure all existing controls
measures are in place before and
during work
 Lifting plan to be prepared by
lifting engineer
 Lifting engineer to ensure safe
access for lorry crane
A
1
1A
All RA Member
15/8/2017
Chew Boon Keong
(Supervisor)
B
2
2B
Lifting Team
15/8/2017
Palaniyandi Sathiyamorth
(Lifting Supervisor)
3B
 Supervisor to monitor and
ensure all existing controls
measures are in place before and
during work
 Ensure to brief lifting plan and
SWP before start work
B
2
2B
Lifting Team
15/8/2017
Palaniyandi Sathiyamorth
(Lifting Supervisor)
3
3B
 Supervisors to ensure LM certs
are not expired and valid
 Lifting supervisor to ensure
maintenance of machine and
regular inspection
B
2
2B
Lifting Team
15/8/2017
Palaniyandi Sathiyamorth
(Lifting Supervisor)
3
3B
 Supervisors to ensure LM certs
are not expired and valid
B
2
2B
Lifting Team
15/8/2017
Palaniyandi Sathiyamorth
(Lifting Supervisor)
A
2
2A
B
3
3B
B
3
B
B
3
Overloading/fai
lure of lifting
gears
3
Manual Handling
of Material
Lifting gears
give way and
hit worker
resulting in
Fatality /
injuries
Exposed sharp
metal edges
Cuts by sharp
edges of metal
pieces/worker
May intensify
fire/explosion
Serious bodily
injury /
property
damage
Eye/skin
contact and
inhalation of
chemical
Causes serious
eye damage /
cause skin,
nose, throat,
and lung
irritation
suspended load
 Ensure working area is demarcated
 Ensure briefing of RA and SWP to site
personnel prior to commencement of
work
 Ensure lifting operation carried out by
appointed lifting crew
 Lifting supervisors to follow the lifting
plan
 Ensure lifting gears are inspected
before use
 Monthly maintenance of lifting gear
must be carried out and colour code
must be applied
 Ensure there is valid LG certificates for
the lifting gear
 Ensure loads to be lifted are within the
LM & LG SWL and is documented in the
lifting plan
 Ensure that all LM and LG are inspected
and colour coded as per requirement
 Sharp corners and edges to be shrink
wrap protected whenever feasible;
 Hand Protection In-house Safety
Training to educate personnel
B
3
3B


C
3
3C


 Fire extinguishers must be provided at
the chemicals storage area.
 Keep chemicals away from
heat/smoking, hot surfaces, sparks,
open flames and other ignition sources.
 User should be briefed on MSDS of
chemicals handling.
 Storage area should be barricaded
properly in a well-ventilated area to
prevent dust accumulation. Any
spillage of powder must be cleaned up
immediately.
 Only trained workers should be
engaged to handles chemicals.
(comments: conduct toolbox meeting
and ask all to sign)
C
 MSDS of specific chemicals should be
briefed to workers.
 Chemicals user should be provided with
suitable protective PPE, i.e. dust proof
safety goggles, respirator, neoprene
gloves, coverall and water safety boots
etc.
 Storage area should be barricaded
properly in a well-ventilated area to
prevent dust accumulation. Any
C
3
3C





3
3C


4
Appointed rigger to report any
damaged lifting gears
immediately
Supervisor to monitor and
ensure all existing controls
measures are in place before
and during work
B
2
2B
Lifting Team
15/8/2017
Palaniyandi Sathiyamorth
(Lifting Supervisor)
Affirm workers’ operational
readiness over briefing;
Encourage ask when in doubt
C
2
2C
All RA Member
15/8/2017
Chew Boon Keong
(Supervisor)
Appropriate warning signage
should be provided at storage
area.
Chemical user should be trained
to use fire extinguisher.
Sodium Percarbonate shall
avoid to exposure to moisture.
Good housekeeping should be
maintained around the storage
area.
A copy of MSDS should readily
available near the chemical
storage area.
C
2
2C
All RA Member
15/8/2017
Chew Boon Keong
(Supervisor)
A copy of MSDS should readily
available near the chemical
storage area.
Appropriate warning signage
should be displayed at storage
area.
C
2
2C
All RA Member
15/8/2017
Chew Boon Keong
(Supervisor)
spillage of powder must be cleaned up
immediately. Storage area must be
located near an eye wash/shower area.
 There must always be a covered
container with clean potable water for
rinsing any contact chemical contact
during the dosing process on boat.
 Remaining unopened Sodium
Percarbonate shall be returned to the
storage location after working every
day.
Unintentional
ingestion
chemical
Serious health
effect: severe
irritation,
nausea,
abdominal
pain, vomiting
and diarrhoea
 Chemicals container should be labelled
according to the type of chemical.
 First aid facilities should be available at
site.
 Storage area should be barricaded
properly in a well-ventilated area to
prevent dust accumulation. Any
spillage of powder must be cleaned up
immediately. Storage area must be
located near an eye wash/shower
area/washing facility.
 There must always be a covered
container with clean potable water for
rinsing any chemical contacted during
the dosing process on boat.
 Remaining unopened Sodium
Percarbonate shall be returned to the
storage location after working every
day.
C
Manual
lifting/shifting
of heavy items
Back sprain /
muscle
strain/worker
 Adopt correct manual handling
method;
 Carry the materials two person, when
the load cannot carry one person;
 Additional manpower if the weight of
load cannot be handled by one worker;
 Use mechanical aid when manual lifting
is not possible;
 Manual Handling In-house Safety
Training to educate personnel
C
3
3C


3
3C




4
General boat
using for barge
Slips, trips and
falls - Accessing
boat, piers,
canal bank,
boat decks,
boat interior
Reportable
injury
 Keep surfaces in good condition – grit
during icy spells, non-slip paints
 Minimal obstructions on floor. Group
briefing on boat conditions.
 Staff present when people accessing
the boat.
 First aid kit and trained staff on hand.
B
2
2B
5


Unused / excess chemicals
should be discarded from the
site.
All personal involved shall be
First Aid trained.
C
2
2C
All RA Member
15/8/2017
Chew Boon Keong
(Supervisor)
Determine the duration and
shorten the time of manual
handling by rotation of workers;
Determine the physical fitness
of the workers to do the manual
handling. Choose younger
worker instead of older one for
the manual handling to
eliminate any potential back
injury during manual handling;
Affirm workers’ operational
readiness over briefing;
Encourage ask when in doubt
C
2
2C
All RA Member
15/8/2017
Chew Boon Keong
(Supervisor)
Daily housekeeping.
Licensed drivers must be on the
back deck at all times, groups
must be supervised by their
own member of staff
B
1
1B
Boatmans
15/8/2017
Chew Boon Keong
(Supervisor)
Falls from a
height - down
steps, from
barge roof
Major injury /
possible head
injury M





5
Movement of
barge and boat
Propeller
Damage
Major injury



Collision with
boats, floating
objects, pier,
overhead
bridge, stuck at
shallow water
at edges
Reportable
injuries
and property
damage




Capsize or
wash out when
tidal gate in
operation
Serious bodily
injury or death
to worker.





6
Use of generator
to operate
electric dosing
machine.
Electrocution
Serious bodily
injury or death
to worker.




Staff assistance with steps and access
Maintenance and condition of steps.
Hand rails in place for using gunnels.
No member of public is to climb on the
gunnels or roof of the boat.
Crew using the gunnels/roof must take
reasonable care to avoid
slipping/falling, and be aware of the
wind/movement of the boat.
First Aid kit and trained staff on hand.
Only trained crew to clear propeller
jams/reeds on prop
Crew must be in possession of keys so
as may not be started whilst
maintaining.
Boats operated only by trained and
suitably experienced crew.
Training crew to be aware of rope
hazards when mooring up; crew to
assist groups accessing/leaving boat
and make aware of the ropes; bright
ropes to be visible against canal bank.
Check the clearance height before
entering the overhead bridge/structure
Avoid operate the boat near edges,
keep a distance of 4-5m away from
edge
Upon receipt of information from PUB
of impending opening of scour valve,
supervisor to inform vessel crew / diver
/ workers to move from the site
immediately.
Before the time of tidal gate opening,
vessel to be brought to shore and all
crew / workers to disembark and stay
out of the water
Vessel and crew / workers shall remain
on shore until clearance is given to
continue their works.
Upon receipt of clearance from PUB,
supervisor led the crew / workers to
the site.
End of the day inform PUB that work of
the day is completed.
Generator and electrical installation
should be inspected by LEW every
monthly.
Only approved industrial type sockets
should be used for connection.
Electric cables should be of weather
proof type and protected from sharp
objects.
Supervisor should conduct daily check
the generator & dosing machine.
B
2
2B

All groups must obey the safety
instructions contained in the
briefing at the beginning of the
cruise
B
1
1B
Boatmans
15/8/2017
Chew Boon Keong
(Supervisor)
B
2
2B

Boats operated only by trained
and suitably experienced crew
B
1
1B
Boatmans
15/8/2017
Chew Boon Keong
(Supervisor)
B
2
2B

All groups must obey the safety
instructions contained in the
briefing at the beginning of the
cruise
B
1
1B
Boatmans
15/8/2017
Chew Boon Keong
(Supervisor)
A
2
2A

All groups must obey the safety
instructions contained in the
briefing at the beginning of the
cruise
A
1
1A
Boatmans
15/8/2017
Chew Boon Keong
(Supervisor)
A
2
2A

Regular inspection of generator
and water pump by safety
personnel.
Display of signage around the
generator housing.
Trained persons shall be
assigned to use the generator &
dosing machine
A
1
1A
Dosing Workers
15/8/2017
Chew Boon Keong
(Supervisor)


6
7
Repair and
servicing of
dosing material,
boat engine,
generator etc. on
site.
Unauthorized
persons doing
repair work on
machineries.
Bodily injuries
to workmen
and property
damage.
Hot oil from
the engine /
hot water from
radiator.
Severe skin
burn injury.
Moving /
rotating parts
of machineries
Hand / finger
injuries to
mechanics.
 Supervisor to ensure that only trained
mechanics carry out repair works.
 Repair and servicing must be carried
out by respective equipment /
machinery owner’s mechanics.
 No repair works to be done by
operators and workers unless very
minor issues which does not endanger
people.
 Brief site team on the SWP of repair
and servicing of machineries.
 Mechanics should wait for the engine
to cool down before start to open the
pipes and tanks.
 Coolants should not be used to cool
down the engine and allow it cool
naturally.
 Use appropriate clothing and PPE for
the work.
 Engine must be switched off before
start to do any repair work.
 All moving/rotating parts must be
properly guarded to prevent injury.
B
2
2B


Supervisor to instruct operator
and workers to inform
immediately if any malfunction
found on the machinery.
No repair work to be done other
than the mechanics
B
1
1B
All RA Member
15/8/2017
Chew Boon Keong
(Supervisor)
B
3
3B

Supervisor to ensure that
mechanics are using the
appropriate PPE.
B
2
2B
All RA Member
15/8/2017
Chew Boon Keong
(Supervisor)
B
3
3B

Mechanics should not wear
loose clothes / rings while
repairing machines.
Safety briefing should be
conducted to mechanics.
B
2
2B
All RA Member
15/8/2017
Chew Boon Keong
(Supervisor)

8
Operating of Oil
Machine
Oil leakage
Oil
contamination
to water
 Only use biodegradable lubricants
B
2
2B

Regular check & clean the
leakage oil on machine.
B
1
1B
All RA Member
15/8/2017
Chew Boon Keong
(Supervisor)
9
Handling,
transport and
temporary
storage of the
Sodium
Percarbonate
powder/
engine oil,
hydraulic oil,
diesel etc
May intensify
fire/explosion;
Serious bodily
injury /
property
damage.
 Chemicals/powder should be provided
with designated storage area with fire
extinguishers.
 Keep Chemicals/powder away from
heat/smoking, hot surfaces, sparks,
open flames and other ignition sources
 Workers should be briefed on the SDS
of chemicals handling by them.
 Storage area should be barricaded
properly during the dosing procedure.
 Only trained workers should be
engaged to handles chemicals.
A
2
2A

A
1
1A
All RA Member
15/8/2017
Chew Boon Keong
(Supervisor)
 SDS of specific chemicals should be
briefed to workers.
 Chemicals user should be provided with
suitable protective PPE, i.e. safety
goggles, mask and neoprene gloves etc.
 Storage area should be barricaded
properly during the dosing procedure.
 Remaining unopened Sodium
Percarbonate shall be returned to the
storage location after working every
day.
C
Appropriate warning signage
should be provided at storage
area.
Chemical user should be trained
to use fire extinguisher.
Sodium Percarbonate powder
shall avoid to exposure to
moisture.
Good housekeeping should be
maintained around the storage
area.
A copy of SDS should readily
available near the chemical
storage area.
A copy of SDS should readily
available near the chemical
storage area.
Appropriate warning signage
should be displayed at storage
area.
C
2
2C
All RA Member
15/8/2017
Chew Boon Keong
(Supervisor)
Contact with
chemicals
Causes serious
eye damage /
cause skin,
nose, throat,
and lung
irritation




3
3C


7
10
Working Under
inclement
weather
Swallow of
chemicals
Serious health
effect: severe
irritation, naus
ea,
abdominal
pain, vomiting
and diarrhoea
 Chemicals container should be labelled
according to the type of chemical.
 First aid facilities should be available at
site.
 Storage area should be barricaded
properly during the dosing procedure.
 Remaining unopened Sodium
Percarbonate shall be returned to the
storage location after working every
day.
B
2
28
 Unused / excess fuel chemicals
should be discarded from the site.
 All personal shall be give First Aid
training.
B
1
1B
All RA Member
15/8/2017
Chew Boon Keong
(Supervisor)
Haze PSI 101 to
2001
Irritation to
ENT,
Chronic lung
and heart
disease
-Asthma
Lightning strike
causing death,
burns
 Job rotation
 Schedule sufficient rest
 Use N95 Masks
C
3
3C
 Check worker’s symptoms and
signs at tool box meeting
 Workers who have medical history
of heart and respiratory illness, to
be refrained from working
C
2
2C
All RA Member
15/8/2017
Chew Boon Keong
(Supervisor)
 Stop works under lightning and heavy
rain
 Seek overhead shelters when
thunderstorm or rain is present
A
2
2A
 Monitor weather forecast
 Close supervision by the
supervisor
A
1
1A
All RA Member
15/8/2017
Chew Boon Keong
(Supervisor)
Heat Stress
Dehydration
Heat Stroke
To all working
persons
 Take shelter between long working
hours
 Water parade daily, once in the
morning, once in the afternoon
C
3
3C
 Drink more water
C
2
2C
All RA Member
15/8/2017
Chew Boon Keong
(Supervisor)
Workers will be
injured due to
cleaning sharp
debris and
Trip &fall
Bruises,
scratches and
Cuts the body
parts
 Wearing Proper PPE such as hand
gloves, long sleeve shirts
D
4
4D
 Make aware on hazards and RA on
daily tool box meeting
D
3
3D
All RA Member
15/8/2017
Chew Boon Keong
(Supervisor)
Lightning and
thunderstorm
11
Housekeeping
8
Table 1: Risk Probability
Quantitative definition
Frequent
Occasional
Remote
Improbable
Extremely Improbable
Probability of Occurrence
Meaning
Likely to occur many times (has occurred frequently in the industry).
Likely to occur some times (has occurred infrequently in the industry).
Unlikely, but possible to occur (has occurred rarely in the industry).
Very unlikely to occur (not known to have occurred in the industry).
Information not available in the literature.
Value
5
4
3
2
1
Table 2: Risk Severity
Severity of Occurrence
Aviation Definition
Catastrophic
Major





Aviation Definition
Hazardous



Minor





Negligible

Meaning
Equipment destroyed
Death, fatal diseases or multiple major injuries
A large reduction in safety margins, physical distress or a
workload such that the operators cannot be relied upon
to perform their tasks accurately or completely.
Serious injury or life-threatening occupational medical
conditions (includes amputations, major fractures,
multiple injuries, occupational cancer, acute poisoning).
Major equipment damage
Meaning
A significant reduction in safety margins, a reduction in
the ability of the operators to cope with adverse operating
conditions as a result of condition impairing their
efficiency.
Serious incidents
Injury to persons that require medical treatment or illhealth leading to disability (includes lacerations, burns,
sprains, minor fractures, dermatitis, deafness, and workrelated upper limb disorders).
Nuisance.
Operating limitations.
Use of emergency procedures
Minor incidents
Injury or ill-health requiring first-aid only (includes minor
cuts and bruises, irritation, ill- health with temporary
discomfort).
Not likely to cause damages, injury or ill- health
Value
A
B
Value
C
D
E
Table 3: Risk Matrix
Risk Probability
5A
Major
B
5B
Risk Severity
Hazardous
C
5C
Minor
D
5D
Negligible
E
5E
4A
4B
4C
4D
4E
3A
2B
3C
3D
3E
2A
2B
2C
2D
2E
1A
1B
1C
1D
1E
Catastrophic A
Frequent
5
Occasional
4
Remote
3
Improbable
2
Extremely Improbable
1
Table 4: Risk Tolerability
Risk Category
I
Region/ Risk Index
Intolerable
5A, 5B, 5C, 4A, 4B, 3A
Criteria
The consequence is unacceptable under the existing circumstances. The work or
activity shall not proceed at all.
T
Tolerable
5D, 5E, 4C, 4D, 4E, 2B, 3C, 3D, 2A, 2B, 2C
After reasonable mitigating measures have been taken to reduce the probability or
the severity of the consequence, the work or activity may proceed upon
endorsement from management.
A
Acceptable
3E, 2D, 2E, 1B, 1C, 1D,1E
The consequence is extremely improbable or not severe enough to be of concern.
9