6 excavations (temporary works) risk assessment templates

6 Excavations (Temporary Works) Risk Assessment Templates
Planned Excavation in areas where live services may be present including:
• Electrical;
• Water;
• Sewerage;
• Gas;
• Telecoms;

PRIOR TO WORKS
Use of Excavator for excavating and backfilling
Excavation open in site area
Confined space working – deep excavations
Maintenance of Excavations

Worker exposure to direct sun
(as applicable)

1. HEALTH SAFETY AND ENVIRONMENT Author: Approved:
RISK ASSESSMENT: ACT/HSE/RA 001 DEEP EXCAVATIONS TO MAS STANDARD
Issued: Rev. Date:
Revision: 0

Page 1 of 3 HSEQ -Rev-01(Aug-2018)




RISK SCORE CALCULATOR
Use the Risk Score Calculator to Determine the Level of Risk of each Hazard
What w ould be the
CONSEQUENCE
of an occurrence be?
What is the LIKELIHOOD of an occurrence? Hierarchy of Controls
Frequent/Almost certain (5)
Continuous or will happen
frequently
Often (4)
6 to 12 times a year
Likely (3)
1 to 5 times a year
Possible (2)
Once every 5 years
Rarely (1)
Less than once every 5
years
Can the hazard be Elim inated or removed
from the w ork place?
Catastrophic (5)
Multiple Fatalities
High 25 High 20 High 15 Medium 10 Medium 5
Can the product or process be substituted for
a less hazardous alternative?
Serious (4)
Class 1 single fatality
High 20 High 16 High 12 Medium 8 Low 4
Can the hazard be engineered aw ay w ith
guards or barriers?
Moderate (3)
Class2 (AWI or LTI) or Class 1
Permanently disabling effects
High 15 High 12 Medium 9 Medium 6 Low 3
Can Adm inistration Controls be adopted
I.e. procedures, job rotation etc.
Minor (2)
Medical attention needed, no work
restrictions. MTI
Medium 10 Medium 8 Medium 6 Low 4 Low 2 Can Personal Protective Equipm ent &
Clothing be w orn to safe guard against
hazards? Insignificant (1)
FAI
Medium 10 Medium 4 Low 3 Low 2 Low 1

Project Name: xxx
RA Ref No.: xxx
RA compilation
Date:
Review date:

Date:
Compiled by:
Reviewed by:
Approved by:
Overall Task Details
Excavation on site greater than 1.2 depth. Use of excavator
Note: Not under RTA Rail restrictions. Classed as Temporary Works
Relevant Applicable MAS:
 00246 – Excavations;
 01413 – Underground services;
 00940 – Plant Operators.
Additional Training required:
Temporary Works Coordinator to be designated
NOC’s Required for task:
Dubai Municipality
No
Specific Task Step
(In sequence of
works)
Hazard Details Consequence/Risk
Initial Risk
Rating Control Measures Residual Risks
Additional Control
Measures
RR
P S RR
1
Planned Excavation in
areas where live
services may be
present including:
 Electrical;
 Water;
 Sewerage;
 Gas;
 Telecoms;

PRIOR TO
WORKS
 Presence of live
underground services;
 Services not in area
specified on drawings;
 Heavy plant or
vehicles accessing
work area;
 Presence of
unmarked services;

 Risk of explosion due to gas line
rupture;
 Risk of flooding of excavation and
adjacent areas due to water main
damage;
 Risk of electrocution or fire due to
cable strike;
 Risk of hazardous waste entering
excavation or water systems due to
live sewerage damage;
 Risk of damage to low depth
underground services from heavy
vehicles;
 Risk of vehicles / Plant entering open
excavation;
4 5
20
HIGH
i. All existing utility service drawings reviewed for known service details and
position;
ii. NOC and Utility provider and ATC Excavation permits to be completed,
unique number added and recorded in log;
iii. Work Area, including access route for plant, to be CAT scanned to locate
exact position of service by competent persons;
iv. Service clearly marked on ground, using posts, tags etc.;
v. Plant access route to be indicated;
vi. Any unidentified services marked on ground and drawing by Temporary
Works Coordinator or Temporary Works Supervisor;
vii. All services clearly communicated to all workers at briefings and TBT’s,
signed off and recorded;
viii. Permit/NOC/JSEA/Approved design Drawings copies to be with task
supervisor in work area for review;
ix. Supervision and Plant Operators instructed to stay within designated area
and access route;
x. All excavation barriers to be planned and to RTA Traffic Management
Manual if adjacent to live roads;
Workers not
complying with
controls
All supervision to monitor
operation;
Regular topic in TBT’s
LOW
2
Use of Excavator for
excavating and
backfilling
 Working with plant in
vicinity of workers;

 Working in vicinity of
underground services;

 Untrained operator;

 Excavator used for
lifting operations;
 Workers struck by operating plant;
 Worker struck by reversing plant;
 Underground service strike;
 Material falling into excavation;
 Damage to machine;
 Collapse of excavation due to
incorrect design/digging;
 Use of incorrect lifting points;

4 4
16
HIGH
i. Supervision and Plant operators instructed not to machine excavate within
1.5m of marked service;
ii. Hand digging only to expose services communicated, only use shovels
marked at 1.2m for guidance;
iii. All operators to be Third Party approved for the type of machine, licence
available for review at all times;
iv. Machine in – Men out mantra to be adhered to. No personnel shall be
inside the excavation when the excavator is working, when personnel are
inside the excavation the excavator shall rotate away and be isolated;
v. No personnel in excavation when pipes etc. are being lowered into
position, to stand outside of excavation;
vi. Banksman to control excavator movements; Spotter to assist operator to
observe and warn of any unidentified services;
vii. All lifting points used on excavators for lifting pipes etc. into position shall
be specified and designated lifting points only;
viii. Daily checks on machine undertaken prior to commencing work;
Damage to
undetected
underground
services


Machine
breakdown


Hydraulic fluid spill
ATC Engineer shall
immediately contact
DEWA/Etisalat/Du as required
for action.
Area isolated.


Machine isolated and
quarantined until repaired.

Spoil removed and treated as
hazardous waste

LOW

2. HEALTH SAFETY AND ENVIRONMENT Author: Approved:
RISK ASSESSMENT: ACT/HSE/RA 001 DEEP EXCAVATIONS TO MAS STANDARD
Issued: Rev. Date:
Revision: 0

Page 2 of 3 HSEQ -Rev-01(Aug-2018)

3
Excavation open in site
area
 Excavation in
working areas with
live traffic
movements and
pedestrians;


 Unprotected
excavation area;

 Excavation not to
approved design;


 Damage to exposed existing live
underground services;
 Trench/excavation collapse;
 Falling/slipping into trenches;
 Overturning of Truck / machinery into
excavation;
 Incident due to poor illumination;
 Incident due to hazardous gas/fumes
entering excavation;
 Collapse/damage of structures due to
undermining;
 Difficulty rescuing injured or collapsed
worker from deep excavation;
4 4
16
High
i. Temporary Works Coordinator / Construction Team to ensure Permit to
Excavate has been issued, communicated and signed by personnel prior
to any excavation work;
ii. Excavation safety buffer, protection, design and traffic signs to be to ATC
Minimum Acceptable Standard, RTA Manual Chapter 3 requirements (as
applicable) and DM Code of Practice -Section 9;
iii. Any exposed services to be protected and adequately supported to avoid
damage;
iv. Any unidentified services discovered to be immediately communicated to
management and work stopped;
v. All spoil to be maintained at least 2m from excavation;
vi. Trench boxes to be used where practicable, backfilled behind;
vii. All shoring, trench sheet supports etc. to be as per approved design,
following correct working procedures;
viii. Temporary Works Coordinator to ensure excavation design adhered to at
all times;
ix. On deep excavations where a suitable ramp cannot be created, a
platform with winch to be established to facilitate emergency rescue of
workers;
x. Provide access ladders or ramps that suitable to the size and location of
excavation. Access and egress ladders/steps to be secured, every 20m
on long runs, or steps dug into soil, suitably supported;
xi. All excavations below 1.2m depth to be benched/battered back to MAS
standards;
xii. Excavation to be inspected daily with written inspection report weekly by
Temporary Works Supervisor;
xiii. Daily briefings to workers on working in excavations requirements by
supervision;
xiv. Use of stop blocks, barriers and other suitable means of protection used
to prevent vehicles entering excavations, warning tape is not to be used
as primary protection;
xv. Where practicable, access roads and pedestrian walkways to be
established away from excavations;
xvi. Suitable and sufficient signage introduced to excavations;
xvii. Backfilling of trenches/excavations to be undertaken as soon as possible
after verification or completion of works;
xviii. Excavation to be suitably illuminated during night times;
xix. No changes to excavations without re-submittal of design reviewed by
the TWC, NOC and Permits;

Vehicle entering
excavation


Excavation
collapse


Incident due to
barrier removal
Emergency services called,
area cleared



Secure area

No removal of protection
barriers without prior approval
from management.

LOW
4
Confined space
working – deep
excavations
 Workers required to
work in confined
space;
 Excess or lack of oxygen;
 Presence of Toxic gases;
 Ingress of water or other substances;
 Explosion due to build-up of gases;
 Sudden water ingress into excavation;
 Restricted emergency evacuation.
4 4
16
High
i. Permit to be issued & gas monitoring undertaken if required before works
commence;
ii. Adequate air circulation & lighting to be maintained in work areas;
iii. Equipment which may release excess oxygen or carbon monoxide gases
shall not be used in confined space areas without adequate extraction;
iv. Local weather forecast should be noted to watch for heavy rains which
may cause flooding;
v. Special consideration to be given to any hot works or work using toxic
substances inside a confined space;
vi. Materials to be stored well away from confined space area;
vii. Top man to be appointed at the entry of the confined space area as
required;
viii. Workers should be physically fit and competent to enter and undertake
the work in confined spaces.
Workers not
adhering to
requirements;

Gas detector not
calibrated
resulting in
incorrect reading
Supervision to constantly
monitor workers;

Regular TBT’s & Trainings to
be given on working Confined
space;
Gas detector to be calibrated
to standards and
manufacturers
recommendations.
Low

3. HEALTH SAFETY AND ENVIRONMENT Author: Approved:
RISK ASSESSMENT: ACT/HSE/RA 001 DEEP EXCAVATIONS TO MAS STANDARD
Issued: Rev. Date:
Revision: 0

Page 3 of 3 HSEQ -Rev-01(Aug-2018)
5
Maintenance of
Excavations

 Adverse weather;

 Excavations open for
long periods;

 Unapproved
amendments to
design;
 Collapse of excavation due to
alterations;
 Damage to excavations due to
incident or adverse weather;
 Incident due to removal of barriers
3 3
9
Med
i. Excavation checked after heavy rains, severe winds etc., stand by
pumps to be available as required;
ii. Weekly recorded inspections undertaken;
iii. Implemented warning signage maintained;
iv. Housekeeping inside excavation to be maintained, all rubbish and waste
material to be removed daily;

Low
6
Worker exposure to
direct sun
(as applicable)
 Workers exposed to
high summer
temperatures;
Worker ill health due to:
 Heat exhaustion,
 Heat stroke;
 Heat Stress.
3 4
12
High
i. Summer Hour Working plan to be designed and implemented;
ii. Municipality summer working hours observed and implemented
(12.30pm to 3.00pm restricted in direct sunlight);
iii. Workers instructed regarding working in the heat and signs of heat
exhaustion etc. at Induction;
iv. Recovery cool rooms established on site;
v. Cool welfare areas established in all locations;
vi. Cool fresh water and electrolyte supplements to be maintained in all
areas;
vii. Pipe welders etc. provided with localised shelters;
New workers
bought onto site
Regular topic in Toolbox Talks Low