Edit Risk Assessment

Reference: RA-2026-OmHbccij

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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
Surface preparation and grit/water blasting on substation roof prior to waterproofing
Working at height, high-pressure water jetting, airborne dust and debris near energized equipment
Falls from height leading to severe injury/fatality, eye injuries, flashover from water spray hitting exposed live conductors
Waterproofing operatives, civil workers, nearby electrical maintenance staff
Install full perimeter scaffolding with guardrails, full-body harness tied off to certified anchor points, eye protection (safety goggles/face shield), maintain minimum safe clearance distances from live overhead lines
P 4 × S 5
20
Schedule work during planned electrical outage/shutdown where feasible; implement strict Permit to Work (PTW) and mandatory pre-task tool box talk.
P 2 × S 3
6
10
Application of torch-on bituminous membrane on electrical switchgear room roof
Open flame (LPG torch), LPG cylinder storage, high surface temperatures near cable risers
Major fire hazard, severe thermal burns, damage to power cables causing electrical short circuits
Waterproofing applicators, site personnel, switchgear operators
Issue Hot Work Permit, maintain 2 x 9kg Dry Powder fire extinguishers on-site, clear all combustible materials and cover cable entries with fire-blankets, LPG cylinders secured upright outside switchroom
P 4 × S 5
20
Mandatory 60-minute continuous fire watch post torching activity; use non-flammable cold-applied self-adhesive membranes near high-density cable penetrations.
P 2 × S 3
6
11
Applying chemical solvent-based liquid waterproofing membrane around live electrical panels
Volatile Organic Compounds (VOCs), toxic fume accumulation, flammable vapor ignition from electrical sparks
Inhalation toxicity, asphyxiation, explosion/fire within switchroom
Waterproofing technicians, electrical engineers inside the switchroom
Forced air mechanical ventilation unit installed, continuous VOC/gas monitoring, elimination of all spark sources, use intrinsic safety/EX-rated lighting and tools
P 4 × S 4
16
Mandatory half-mask respirators with ABEK1 filters; switch to water-based/low-VOC polyurethane liquid membranes.
P 1 × S 3
3
12
Waterproofing cable trenches and basement cable cellars (underground tanking)
Confined space entry, hazardous atmosphere, restricted access/egress, proximity to high-voltage cables
Asphyxiation, loss of consciousness, electrocution, delayed emergency evacuation
Confined space entry workers, safety standby person
Confined Space Entry Permit, continuous 4-gas atmosphere testing, dedicated trained Hole Watcher, 110V/battery-operated SELV lighting
P 4 × S 5
20
Lockout/Tagout (LOTO) isolation of live cables within trench where possible; tripods and winch retrieval system deployed at access hatch.
P 1 × S 3
3