Edit Risk Assessment

Reference: RA-2026-MwiccheC

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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