Edit Risk Assessment

Reference: RA-2026-kTtni2QP

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Febrication installation of concrete triugh

Electrical

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Risk Assessment Matrix

SN Activity Hazard Consequence Groups Exposed Controls Initial Risk Additional Controls Residual Risk Actions
1
Complete HDPE Duct Infill
1. Vehicle movement and traffic hazards 2. Manual handling during loading/unloading 3. Uneven ground conditions
Personal injury, property damage
Site Personnel, Subcontractors, Public
1. Implement traffic management plan 2. Designated walkways 3. Mandatory PPE 4. Speed limit enforcement
P 3 × S 3
9
1. Comply with ADOSH SF CoP 27.0 2. Daily vehicle inspection 3. Toolbox talk
P 2 × S 2
4
2
Site mobilization and setup of temporary
Passing high-speed public traffic and moving site vehicles
Personal injury, property damage
Site Personnel, Subcontractors, Public
Approved TTM plan, high-visibility clothing (Class 3), physical water-filled/concrete barriers, advanced warning signs, and trained flagmen.
P 3 × S 3
9
Deployment of Truck Mounted Attenuators (TMA) and enforcement of reduced speed limit zone in coordination with local traffic authorities.
P 2 × S 2
4
3
Trench excavation and sub-surface ground preparation
Accidental strike on existing buried live electrical cables or gas utilities
Personal injury, property damage
Site Personnel, Subcontractors, Public
Utility mapping review, CAT & Genny cable avoidance scanning, and manual trial pits (pot-holing) prior to mechanical excavation.
P 3 × S 3
9
Mandatory Permit to Dig system, use of insulated hand tools near identified utilities, and continuous competent supervision.
P 2 × S 2
4
4
Uncoiling, handling, and positioning HDPE pipe
Sudden release of stored mechanical spring energy in coiled HDPE pipe
Personal injury, property damage
Site Personnel, Subcontractors, Public
Use of specialized pipe reeler/uncoiler frame, controlled strap cutting procedures, and establishing exclusion zones.
P 3 × S 3
9
Mandatory deployment of safety restraints/bands before unstrapping and wearing high-impact resistant safety glasses and gloves.
P 2 × S 2
4
5
HDPE pipe jointing via electrofusion and
High-temperature heating elements, hot molten plastic, and portable electrical generators
Personal injury, property damage
Site Personnel, Subcontractors, Public
Certified welding equipment, RCD-protected generators, heat-resistant safety gloves, and portable fire extinguishers nearby.
P 3 × S 3
9
Hot Work Permit implementation, provision of localized exhaust ventilation or respiratory protection (FFP3) in confined areas.
P 2 × S 2
4
6
Entry into underground chambers and manholes
Hazardous atmosphere (oxygen deficiency, toxic gases like H2S/methane), engulfment, or fall from height
Personal injury, property damage
Site Personnel, Subcontractors, Public
Confined Space Entry Permit, pre-entry 4-gas atmospheric testing, forced air ventilation, and tripod rescue system with harness.
P 3 × S 3
9
Continuous multi-gas monitoring during entry, dedicated trained top-person/standby monitor, and verified emergency rescue plan.
P 2 × S 2
4
7
Mechanical winch pulling of HDPE sub-ducts
High-tension winch wire snap, rotating capstans, and pinch/nip points
Personal injury, property damage
Site Personnel, Subcontractors, Public
Properly rated winching wire with calibrated weak-link swivel, emergency stop switches, and safety guards over rotating parts.
P 3 × S 3
9
Integrated load monitoring with automatic shut-off at peak tension limits and strict exclusion zones along the tension line.
P 2 × S 2
4
8
Duct proving (mandrel testing) and air
Uncontrolled high-pressure compressed air release and projectile ejection of foam pig or mandrel
Personal injury, property damage
Site Personnel, Subcontractors, Public
Calibrated pressure relief valves, secure containment/catcher cage at receiving duct end, clear exclusion zone enforcement.
P 3 × S 3
9
Mandatory Pressure Testing Permit, full-face protection shields for operators, and calibrated double-gauge manifolds.
P 2 × S 2
4
9
Delivery, offloading, and site staging of precast concrete troughs and materials
Heavy vehicle movement, struck by suspended loads, pinch points during offloading
Severe crushing injuries, fractures, structural damage, fatalities
Riggers, banksmen, crane operators, transport drivers, site operatives
Traffic Management Plan enforced, dedicated offloading zone, certified lifting equipment and rigging accessories, trained banksman/slinger
P 3 × S 4
12
Establish rigid physical exclusion zones around lifting radiuses; mandatory pre-use inspection of crane/HIAB and slings; wind speed monitoring prior to lifts
P 1 × S 4
4
10
Excavation and trench preparation for concrete trough routing
Underground electrical utilities strike, trench wall collapse, cave-ins
Electrocution, severe arc flash burns, engulfment injuries, fatalities
Excavator operators, groundworkers, site engineers
Review utility drawings, perform CAT and Genny ground scan, digging permit system, implement trench shoring or battering back of slopes
P 4 × S 5
20
Enforce hand-digging / soft excavation within 0.5m of verified utilities; continuous gas monitoring and competent person inspections of trench integrity
P 1 × S 5
5
11
On-site cutting, trimming, and modification of concrete troughs
Inhalation of Respirable Crystalline Silica (RCS) dust, tool kickback, flying debris, high noise levels
Silicosis, occupational asthma, severe lacerations, eye injuries, Noise-Induced Hearing Loss (NIHL)
Power tool operators, masonry workers, nearby site personnel
Wet-cutting suppression systems or integrated M-class dust extraction, safety guards on cut-off saws, mandatory PPE (FFP3 respirators, impact goggles, ear defenders)
P 4 × S 3
12
Pre-use inspection of cutting discs and arbor fitment; HAVS (Hand-Arm Vibration) exposure time tracking; job rotation for operators
P 2 × S 2
4
12
Mechanical lifting and lowering of concrete troughs into the excavation trench
Failure of lifting tackle, dropped loads, encroachment near overhead powerlines
Crushing injuries, electrocution, equipment destruction, fatal strikes
Lifting team, groundworkers inside trench, excavator/crane operators
Approved Lift Plan, certified lifting beams/slings, safety latches on hooks, clear line-of-sight communication via radio or standard hand signals
P 3 × S 5
15
Maintain mandatory clearance distances from overhead powerlines; use tag lines to guide loads (no direct hand contact on suspended troughs); keep operatives out of trench while load is above
P 1 × S 4
4