Edit Risk Assessment

Reference: RA-2026-pwB89pB2

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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
Positioning mobile crane near live overhead power lines and substation yards
Proximity to high-voltage energized overhead conductors and electro-magnetic induction zones
Electrocution, high-voltage arcing, fatal electric shock, catastrophic fire, equipment damage, grid tripping
Crane operator, riggers, banksman, ground personnel
Establish minimum approach distances (MAD) per voltage level, deploy dedicated Banksman, implement earthing of crane chassis, verify electrical isolation where possible
P 4 × S 5
20
Issue formal Permit to Work (PTW) and Electrical Isolation Certificate; install physical height limiting Goal Posts and proximity alarms on crane boom; use non-conductive synthetic taglines.
P 1 × S 4
4
10
Rigging and slinging heavy oil-filled power transformers
Incorrect rigging configuration, dynamic center-of-gravity (CoG) shift due to internal oil, defective lifting gear
Dropped load, structural crushing fatalities, major oil spill, loss of primary electrical assets
Rigging team, lifting supervisor, nearby electrical installers
Pre-use inspection of Third-Party Certified (TPI) slings and shackles, verify transformer weight and CoG from manufacturer drawing, color-code lifting equipment
P 3 × S 5
15
Appointed Person (AP) to review and approve engineered Lifting Plan; conduct NDT on transformer integrated lifting lugs; utilize certified spreader beams to avoid tank body crushing.
P 1 × S 3
3
11
Lowering switchgear panels through building floor openings into elevated electrical rooms
Uncontrolled load swing, pinch points against structural openings, restricted visibility
Crushing injuries, limb amputation, structural damage to building/equipment, internal damage to sensitive vacuum circuit breakers
Substation installation crew, riggers, signalman
Rigid barricading of exclusion zone beneath opening, taglines used to steer load, qualified signalman maintaining continuous line-of-sight
P 4 × S 4
16
Enforce strict 'Red Zone' zero-entry beneath elevated loads; install custom guide rails/skids at hatch edge; utilize radio communications between signalman and winch/crane operator.
P 1 × S 2
2
12
Offloading heavy high-voltage cable drums using mobile crane
Dislodging of cable drum spindle bar, asymmetric weight distribution, rolling of drum post-landing
Load shift during lift, crane boom side-loading, impact injuries to ground handlers, cable damage
Crane operator, riggers, cable jointing technicians
Use TPI-certified cable drum spreader beam and rated spindle axle, inspect drum wooden/steel flanges for defects prior to lift
P 3 × S 4
12
Install safety locking collars/pins on spindle bar; pre-position wheel chocks on landing area before touchdown; maintain clear escape routes for ground crew.
P 1 × S 2
2