Risk Assessment Form
#16 Activity-Based Risk Assessment for Installation of Backflow Devices at the Terror Club, Bachelor’s Quarters
and Lodging / Task Order #0057
Inventory of Work Activities
Contractor: PAE Singapore PTE LTD
Sub-Contractor: PNH Resources PTE LTD
No.
1
Process Description
Engineering Services
2
Work at the Terror Club
2.1
3
Hoarding
Install backflow prevention
devices at the Terror Club Facility
3.1 Install 11 Atmospheric
Hose Bibb Vacuum
Breakers
3.2 Install 11 ¾ in. diameter
polished/chrome plated
brass threaded hose bibbs
3.3 Install Dual Check Valves
3.4 Install (1) Zurn OCD4P
Plastic Air Gap
3.5 Install (4) Reduce Pressure
Valves
3.6 Install Atmospheric
Vacuum Breakers (6)
4
18 October 2011
Work Activities
PNH shall provide Professional Engineering services and Qualified Person certification for completion of this work.
Supply and install hoarding and safety items and removal upon completion.
Supply, deliver and install (11) “Wilkins Model BFP-8” Atmospheric Hose Bibb Vacuum Breakers” at toilet and pool side.
Supply, deliver and install (11) replacements to existing unthreaded hose bibbs to new and approved standard type 3/4in. diameter
polished/chromed plated brass threaded hose bibbs for new connection of atmospheric hose bibs vacuum breaker.
Supply, deliver and install (9) “Wilkins Model No. 780” Dual Check Valves with “Hose Type Connection” to all affected existing
washer water supply lines at clubhouse.
Cut existing pipe and modify fittings, then install an air gap (1) adaptor fittings, “Zurn QCD4P Plastic Air Gap” between the PVC
drain pipe and discharge pipe connected from the dishwashing machines at clubhouse
Cut existing pipe and modify fittings, then install a Reduce Pressure Valve (4) between supply line and solar water heater and heat
pump in accessible location for maintenance.
Supply, deliver and install approved automatic urinal flushing system(6) with built-in Atmospheric Vacuum Breaker at toilet
Terror Club Pool
4.1 Hoarding
Supply and install hoarding and safety items and removal upon completion.
4.2 Toning
Provide toning services to identify existing services.
4.3 Excavation
4.4 Backfill
Excavate trench and remove existing RP backflow device. Upon completion of excavation and work on backflow preventers, supply,
deliver and install required restoration materials, then backfill trench and reinstate all disturbed area to original condition. Note: In
accordance with the EM-385-1-1, an excavation plan is not required as the trenching works are not anticipated to exceed 1.5 meters
(5 feet). However, this element of the operation will be addressed by this section of the pertinent AHA.
Backfill and remove excavated debris off site.
4.5 Existing backflow
Dismantle and remove unwanted backflow devices.
4.6 Water rerouting
Supply, deliver and install all required pipes and fitting for the rerouting the water line from the main water line to clubhouse.
4.7 Install new RP devices
Supply, deliver and install required new RP backflow devices serving the pools.
4.8 Modify Piping/install new
RP backflow devices
Supply and modify existing piping system after removal of RP backflow devices. Supply and install new and approved RP backflow
devices to the main line serving the 2 pools.
4.9 Replace cement slab
Supply and cast new concrete slab at damaged areas for tiling (measured separately).
4.91 Tiling
Supply and lay new and matching floor tiles at newly casted concrete slab.
4.92 CMU Wall
Construct new cmu wall around the new RP installation.
4.93 Cleaning
Carry out all cleaning works on completion of all installation works.
5
Bachelor’s Quarters and Lodging
For the proposed sites of installation for bachelor’s quarters and lodging, see List “A” Revision 1 below
6
Heat Stress Exposure
Please refer to the AHA regarding heat stress for further information regarding this assessment.
Risk Assessment Form
Activity-Based Risk Assessment Form
Company:
Contractor: PAE SINGAPORE PTE LTD
Sub-Contractor: PNH RESOURCES PTE LTD
Process/Location:
Approved by:
Mr. Lee Wilson, PNH
(Name, designation)
Senior Safety Manager
(Date)
18 October 2011
1. Hazard Identification
Last Review
Date:
1b
1c
1d
2a
No
Work Activity
Hazard
Possible
Accident/
Ill Health &
Persons at Risk
Engineering
personnel
working on this
project
Existing Risk
Control
(if any)
Engineering
Services
2
Site Preparation
2.1 Install
hoarding and
safety signage at
the Terror Club
Ergonomic –
Repetitive
Motion type
injuries from
office work
Musculoskeletal –
possible strains
and sprains from
Workers
assigned to erect
these structures.
2b
Bradamente Amoroso
(Martin)
Engineer
18 October 2011
18 October 2011
Next
Review
Date:
3. Risk Control
2. Risk Evaluation
1a
1
Conducted by: (Names, designations)
(Date)
EM 385-1-1
Ministry of Manpower Requirements
15 April 2012
2c
2d
3a
3b
Severity
Liklihood
Risk
Level
Additional Risk Control
Action
Officer
Designation
A review of
these work
practices
indicate that
workers
generally have
sufficient
opportunity of
take breaks and
vary work
positions as
needed.
Minor
Remote
Low
This is not considered a
significant problem but
engineers should receive
training with regards to the
risks associated with these
types of injuries.
Senior
Safety
Manager
Tool Box talks
should address
this potential risk
prior to the
beginning of the
project.
Minor
Remote
Low
This is not considered to be a
significant risk factor but is
included on this form to ensure
continuity.
Senior Safety
Manager
Note: Company tool box talk
addressed this issue this morning
during training.
No
3
Work Activity
Hazard
Possible
Accident/
Ill Health &
Persons at Risk
Existing Risk
Control
(if any)
Severity
Liklihood
Risk
Level
2.2
Sight Hazard from
flying debris
Sight Protection
has been issued to
all PNH Workers
Minor
Remote
2.3
Noise Hazard
from operating
hand held power
tools
Workers
assigned to
construct the
hoarding, safety
barricades and
post the safety
signage.
Workers
assigned to
construct the
hoarding and
post the safety
signage.
All PNH Workers
have been issued
hearing protection
and have received
training on the
hazard posed to
hearing from
working around
loud equipment.
Minor
Remote
Installation of
backflow
prevention
devices at the
Terror Club
Facility
3.1 Install 11
Atmospheric
Hose Bibb
Vacuum
Breakers
Additional Risk Control
Action
Officer
Designation
Low as
long as
sight
protection
is used.
Routine training on the Sight
Conservation Program is
conducted both on the company
level and at the on-site tool box
talks.
Senior Safety
Manager
Low - as
long as
hearing
protection
is used.
Pre-Construction training should
address this issue prior
conducting this phase
Senior Safety
Manager
Senior Safety
Manager
The primary issue
with items 3.1 –
3.6 will be sight
protection.
There will be a lot
of manual work
with tools.
Workers will
need to bear in
mind that sight
protection must
be worn a all
times on the job.
Workers
assigned to
completed this
installation
Eye protection
issued by the
company.
Additional Sight
Protection will
need to be
employed for
workers assigned
to do brazing
and/or welding.
Minor
Remote
Low
Routine training on the Sight
Conservation Program is
conducted both on the company
level and at the on-site tool box
talks.
Senior Safety
Manager
Another issue
during this
installation
process may be
welding or
brazing. These
issues have not
been confirmed
but have been
included for
coverage of all
potential hazards.
No
4
Work Activity
3.2 Install 11 ¾
in. diameter
polished/chrome
plated brass
threaded hose
bibbs
3.3 Install Dual
Check Valves
3.4 Install (1)
Zurn OCD4P
Plastic Air Gap
3.5 Install (4)
Reduce Pressure
Valves
3.6 Install
Atmospheric
Vacuum
Breakers (6)
Terror Club Pool
4.1 Hoarding
Hazard
Possible
Accident/
Ill Health &
Persons at Risk
Existing Risk
Control
(if any)
Severity
Liklihood
Risk
Level
Additional Risk Control
Action
Officer
Designation
Senior Safety
Manager
Senior Safety
Manager
Senior Safety
Manager
Senior Safety
Manager
Senior Safety
Manager
Musculoskeletal –
possible strains
and sprains from
Workers
assigned to erect
these structures.
Tool Box talks
should address
this potential risk
prior to the
beginning of the
Minor
Remote
Low
This is not considered to be a
significant risk factor but is
included on this form to ensure
continuity.
Senior Safety
Manager
project.
No
Note: Company tool box talk
addressed this issue this morning
during training.
Work Activity
Hazard
Possible
Accident/
Ill Health &
Persons at Risk
Existing Risk
Control
(if any)
Severity
Liklihood
Risk
Level
4.2 Toning
Heat Stress - This
operation will be
performed by an
out-side
contractor to
identify
subterranean
utilities that
could be
disturbed during
the excavation.
Heat Stress
Heat Stress, see
section six below
for additional
information.
Minor
Remote
Minor
Sight Hazard from
flying debris
Workers
assigned to
construct the
hoarding, safety
barricades and
post the safety
signage.
Workers
assigned to
construct the
hoarding and
post the safety
signage.
Training on Heat
Stress – Brief
contractor
personnel with
regards to the
Heat Stress
Program on this
compound, what
the heat stress flag
color system
means.
All PNH workers
received routine
training with
regards to the
Heat Stress
Program
Sight Protection
has been issued to
all PNH Workers
All PNH Workers
have been issued
hearing protection
and have received
training on the
hazard posed to
hearing from
working around
loud equipment.
4.3
Excavation
Hearing Hazard
from excavation
equipment
Personnel
involved in the
excavation
process
Additional Risk Control
Action
Officer
Designation
Low
Afford the sub-contractor doing
the toning the opportunity to
review this activity hazard
assessment.
Senior Safety
Manager
Remote
Low
Senior Safety
Manager
Minor
Remote
Low as
long as
sight
protection
is used.
Most of our workers are from
countries where heat stress
conditions are at least as
challenging as they are in
Singapore so they primarily
arrive here acclimated.
Routine training on the Sight
Conservation Program is
conducted both on the company
level and at the on-site tool box
talks.
Minor
Remote
Low - as
long as
hearing
protection
is used.
Pre-Construction training should
address this issue prior
conducting this phase
Senior Safety
Manager
Senior Safety
Manager
No
Work Activity
4.4 Backfill
Hazard
Possible
Accident/
Ill Health &
Persons at Risk
Heat Stress
Personnel
involved in the
backfill process
Sight Hazard from
flying debris
Workers
assigned to
construct the
hoarding, safety
barricades and
post the safety
signage.
Workers
assigned to
construct the
hoarding and
post the safety
signage.
Hearing Hazard
from excavation
equipment
4.5 Existing
backflow Dismantle and
remove
unwanted
backflow
devices.
Musculoskeletal –
possible strains
and sprains from
4.6 Water
rerouting Supply, deliver
and install all
required pipes
and fitting for
the rerouting
Brazing on piping
#5 and above
brazing wire
frequently
contains
cadmium which is
a human
Workers
assigned to
dismantle these
structures.
Workers
assigned to do
brazing and
potentially
others in the
immediate
vicinity.
Existing Risk
Control
(if any)
Severity
Liklihood
Risk
Level
All PNH workers
received routine
training with
regards to the
Heat Stress
Program
Sight Protection
has been issued to
all PNH Workers
Minor
Remote
Low
Minor
Remote
Low as
long as
sight
protection
is used.
All PNH Workers
have been issued
hearing protection
and have received
training on the
hazard posed to
hearing from
working around
loud equipment.
Tool Box talks
should address
this potential risk
prior to the
beginning of the
project.
Minor
Remote
Minor
Remote
Most of these
works will be
conducted
outdoors and the
construction site
will be controlled
to prevent
Minor
Remote
Additional Risk Control
Action
Officer
Designation
Most of our workers are from
countries where heat stress
conditions are at least as
challenging as they are in
Singapore so they primarily
arrive here acclimated.
Routine training on the Sight
Conservation Program is
conducted both on the company
level and at the on-site tool box
talks.
Senior Safety
Manager
Low - as
long as
hearing
protection
is used.
Pre-Construction training should
address this issue prior
conducting this phase
Senior Safety
Manager
Low
This is not considered to be a
significant risk factor but is
included on this form to ensure
continuity.
Senior Safety
Manager
Low
Note: Company tool box talk
addressed this issue this morning
during training.
Sight protection is used during
brazing operations.
Senior Safety
Manager
Senior Safety
Manager
the water line
from the main
water line to
clubhouse.
No
Work Activity
4.7 Install
new RP devices
carcinogen
Hazard
Musculoskeletal –
possible strains
and sprains from
Sight from flying
debris
4.8 Modify
Piping/install
new RP backflow
devices
4.9 Replace
cement slab
4.91 Tiling
Sight from flying
debris
inadvertent traffic
through the area
Possible
Accident/
Ill Health &
Persons at Risk
Workers
assigned to
install these
devices.
Workers
assigned to
install these
devices.
Workers
assigned to
install these
devices.
Musculoskeletal –
possible strains
and sprains from
Workers
assigned to
install the new
slab.
Musculoskeletal –
possible strains
Workers
assigned to
Existing Risk
Control
(if any)
Severity
Liklihood
Risk
Level
Tool Box talks
should address
this potential risk
prior to the
beginning of the
project.
Minor
Remote
Low
Tool Box talks
should address
this potential risk
prior to the
beginning of the
project.
Minor
Tool Box talks
should address
this potential risk
prior to the
beginning of the
project.
Minor
Tool Box talks
should address
this potential risk
prior to the
beginning of the
project.
Tool Box talks
should address
Minor
Remote
Low
Minor
Remote
Low
Remote
Remote
Additional Risk Control
This is not considered to be a
significant risk factor but is
included on this form to ensure
continuity.
Low
Note: Company tool box talk
addressed this issue this morning
during training.
This is not considered to be a
significant risk factor but is
included on this form to ensure
continuity.
Low
Note: Company tool box talk
addressed this issue this morning
during training.
This is not considered to be a
significant risk factor but is
included on this form to ensure
continuity.
Note: Company tool box talk
addressed this issue this morning
during training.
Note: Company tool box talk
addressed this issue this morning
during training.
Note: Company tool box talk
addressed this issue this morning
Action
Officer
Designation
Senior Safety
Manager
Senior Safety
Manager
Senior Safety
Manager
Senior Safety
Manager
Senior Safety
Manager
4.92 CMU
Wall
4.93 Cleaning
5
6
Installation of
back flow
prevention
devices in
bachelor’s
quarters and
lodging
See List “A”
Revision 1 for a
listing of where
and what type
backflow
prevention
devices are
scheduled to be
installed in these
units.
Working
outdoors in the
heat in
Singapore
and sprains from
install the new
tiling.
Musculoskeletal –
possible strains
and sprains from
Workers
assigned to
install the new
tiling.
Sight Hazard from
water under
pressure and
possibly some
detergents
Sight Hazard from
manipulating
tools manually
can create a sight
hazard
Workers
assigned to do
the cleaning
Workers
assigned to
complete these
installations
Heat Cramps
Heat Rash
Heat Syncope
Heat Exhaustion*
Heat Stroke**
Personnel
performing the
installation of
this equipment,
performing
excavation ,
toning and
backfilling
*If not treated
properly can
progress to heat
this potential risk
prior to the
beginning of the
project.
Tool Box talks
should address
this potential risk
prior to the
beginning of the
project.
Wear appropriate
eye protection
during training.
Minor
Remote
Low
Note: Company tool box talk
addressed this issue this morning
during training.
Senior Safety
Manager
Minor
Remote
Low
Tool Box talks frequently address
the elements of the Sight
Conservation Program.
Senior Safety
Manager
Wear appropriate
eye protection
Minor
Remote
Low
Tool Box talks frequently address
the elements of the Sight
Conservation Program.
Senior Safety
Manager
Tool Box Talk
Training
concerning heat
stress, clean
drinking water at
all job sites,
sufficient rest
periods for
workers in
Moderate
Remote
Low
Continue emphasis on heat
injuries whenever safety stand
downs, events, tool box talks
etc.. are planned. Ensure that
drinking water is always
available for crews working in
heat stress conditions. Ensure
that sub contractors receive
training on the Heat Stress
Senior Safety
Manager
**Life
Threatening and
is a real medical
emergency.
Definitive
medical
assistance must
be summoned.
accordance with
permissible
exposure limit
tables in NAVMED
P-5010 and
Ministry of
Manpower
Recommendations
Heat Stress
(Color)
Green
Yellow
Red
Black
Condition
Calculations:
WBGT = WB X 0.7 + DB X 0.1 + GT X 0.2
Meter calibration should be manually verified every 3 months. Manual calculation must be 0.2 + the meter WBGT readout
I
II
III
IV
Heat Stress WBGT
Temperature
82-84.9
85-87.9
88-89.9
Above 90
Program observed at the
Sembawang Compound
including the use of colored flags
and what they mean as follows:
Activity Level
Discretion is required when planning heavy exercise for acclimatized personnel.
Strenuous exercise and activity for new and un-acclimatized personnel during the first 30 days of heat exposure.
Strenuous exercise should be curtailed for personnel with less than 12 weeks of training in hot weather.
Physical training and exercise should be curtailed for all personnel (operational commitments excluded).
Heat stroke likelihood is high under conditions of high exertion.
LIST “A” (REVISION 1)
LIST OF BACKFLOW DEVICES
QUANTITY
ITEM
DESCRIPTION
NUMBER
1
Bachelor Housing (BQ)
UNIT
i
To supply & install the following backflow preventers for BQ 2 Rm Apt s
St John units + 235 Ottawa – x 36 units
Scope of work for one unit
a. To supply & install a double check valve after the main water supply Meter
1
EA
b. To supply & install a double check valve for the dishwasher supply line
1
EA
c. To supply & install a Air Gap at the dishwasher drain line
1
EA
d. To supply & install a vacuum breaker for the fridge supply line
1
EA
e. To supply & install a Air Gap for the water closet
2
EA
f. To supply & install a vacuum breaker for the toilet sprayer
2
EA
g. To supply & install new faucet and vacuum breaker for the tap in the toilet
2
EA
h. To remove a dual check valve for the supply to the washer
1
EA
i. To supply & install new faucet and vacuum breaker for the maid's shower
1
EA
j. To supply & install a Air Gap for the water closet at maid quarter
1
EA
k.To supply & install new faucet vacuum breaker for the wash basin at maid quarter
1
EA
l. To supply & install new faucet and vacuum breaker for the tap in the maid quarter's
toilet
1
EA
m. To supply & install new faucet and vacuum breaker for the toilet sprayer
1
EA
n. To supply & install new faucet and vacuum breaker for hose bibb (outside)
1
EA
o. To supply & install new vacuum breaker for main bldg shower
1
EA
ii
To supply & install the following backflow preventers for BQ 3 Rm Apts
Bermuda units – x 16 units
Scope of work for one unit
a. To supply & install a double check valve after the main water supply Meter
1
EA
b. To supply & install a double check valve for the dishwasher supply line
1
EA
c. To supply & install a Air Gap at the dishwasher drain line
1
EA
d. To supply & install a vacuum breaker for the fridge supply line
1
EA
e. To supply & install a Air Gap for the water closet
2
EA
f. To supply & install a vacuum breaker for the toilet sprayer
2
EA
g. To supply & install new faucet and vacuum breaker for the tap in the toilet
DELETED
2
EA
h. To remove a dual check valve for the supply to the washer
1
EA
i. To supply & install new faucet and vacuum breaker for the maid's shower
0
EA
j. To supply & install a Air Gap for the water closet at maid quarter
0
EA
k.To supply & install new faucet vacuum breaker for the wash basin at maid quarter
0
EA
l. To supply & install new faucet and vacuum breaker for the tap in the maid quarter's
toilet
1
EA
2
m. To supply & install new faucet and vacuum breaker for the toilet sprayer
0
EA
n. To supply & install new faucet and vacuum breaker for hose bibb (outside)
1
EA
o. To supply and install vacuum breaker for main bulding shower
1
EA
a. To supply & install a double check valve after the main water supply Meter
1
EA
b. To supply & install a double check valve for the dishwasher supply line
1
EA
c. To supply & install a Air Gap at the dishwasher drain line
1
EA
d. To supply & install a vacuum breaker for the fridge supply line
1
EA
e. To supply & install a Air Gap for the water closet
2
EA
Lodging (LO)
To supply & install the following backflow preventers for 3 Rm Apts
Durban units – x 24 units
Scope of work for one unit
i
f. To supply & install a vacuum breaker for the toilet sprayer
2
EA
g. To supply & install new faucet and vacuum breaker for the tap in the toilet
2
EA
h. To remove a dual check valve for the supply to the washer
1
EA
i. To supply & install new faucet and vacuum breaker for the maid's shower
1
EA
j. To supply & install a Air Gap for the water closet at maid quarter
1
EA
k.To supply & install new faucet vacuum breaker for the wash basin at maid quarter
1
EA
l. To supply & install new faucet and vacuum breaker for the tap in the maid quarter's
toilet
1
EA
m. To supply & install new faucet and vacuum breaker for the toilet sprayer
1
EA
n. To supply & install new faucet and vacuum breaker for hose bibb (outside)
1
EA
o. To supply and install vacuum breaker for main bulding shower
2
EA
Total 24
Units
To supply & install the following backflow preventers for 3 Rm Apts
Ottawa units – x 12 units
Scope of work for one unit
ii
a. To supply & install a double check valve after the main water supply Meter
1
EA
b. To supply & install a double check valve for the dishwasher supply line
1
EA
c. To supply & install a Air Gap at the dishwasher drain line
1
EA
d. To supply & install a vacuum breaker for the fridge supply line
1
EA
e. To supply & install a Air Gap for the water closet
2
EA
f. To supply & install a vacuum breaker for the toilet sprayer
2
EA
g. To supply & install new faucet and vacuum breaker for the tap in the toilet
2
EA
h. To remove a dual check valve for the supply to the washer
1
EA
i. To supply & install new faucet and vacuum breaker for the maid's shower
0
EA
j. To supply & install a Air Gap for the water closet at maid quarter
0
EA
k.To supply & install new faucet vacuum breaker for the wash basin at maid quarter
0
EA
l. To supply & install new faucet and vacuum breaker for the tap in the maid quarter's
toilet
1
EA
m. To supply & install new faucet and vacuum breaker for the toilet sprayer
0
EA
n. To supply & install new faucet and vacuum breaker for hose bibb (outside)
1
EA
o. To supply and install vacuum breaker for main bulding shower
1
EA
DELETED
Total 12
Units
To supply & install the following backflow preventers for 2 Rm Apts
Ottawa DV units – x 4 units
Scope of work for one unit
iii
a. To supply & install a double check valve after the main water supply Meter
1
EA
b. To supply & install a double check valve for the dishwasher supply line
1
EA
c. To supply & install a Air Gap at the dishwasher drain line
1
EA
d. To supply & install a vacuum breaker for the fridge supply line
1
EA
e. To supply & install a Air Gap for the water closet
2
EA
f. To supply & install a vacuum breaker for the toilet sprayer
2
EA
g. To supply & install new faucet and vacuum breaker for the tap in the toilet
2
EA
h. To remove a dual check valve for the supply to the washer
1
EA
i. To supply & install new faucet and vacuum breaker for the maid's shower
0
EA
j. To supply & install a Air Gap for the water closet at maid quarter
0
EA
k.To supply & install new faucet vacuum breaker for the wash basin at maid quarter
0
EA
l. To supply & install new faucet and vacuum breaker for the tap in the maid quarter's
toilet
1
EA
m. To supply & install new faucet and vacuum breaker for the toilet sprayer
0
EA
n. To supply & install new faucet and vacuum breaker for hose bibb (outside)
1
EA
o. To supply and install vacuum breaker for main bulding shower
Total 4 Units
1
EA