Water Proofing
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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 |
Pre-work site inspection and electrical isolation (LOTO) in areas requiring waterproofing
|
Presence of energized electrical panels, switchgear, or exposed cables in damp environments
|
Electrocution, electric shock, arc flash, fatal injury, secondary trauma from falls
|
Waterproofing technicians, electrical technicians, site supervisors
|
Verify Lockout/Tagout (LOTO) and de-energization with a multi-meter; issue Permit to Work (PTW); install physical insulated barriers and IP-rated temporary covers over adjacent live components; use intrinsically safe portable lighting (24V/battery-operated).
|
P
4
×
S
5
20
|
Continuous supervision by a qualified electrical safety observer; mandatory daily safety briefing on dead-work boundaries.
|
P
1
×
S
4
4
|
|
| 10 |
Mechanical surface preparation (grinding/wire brushing) near electrical penetrations and switchgear
|
Conductive dust ingress into electrical assemblies, flying debris, hand-arm vibration, high noise
|
Short circuit, equipment failure, eye injury, lacerations, noise-induced hearing loss
|
Applicators, nearby electrical operators
|
Use HEPA-filtered vacuum-attached shrouded grinders; seal all electrical panels and bus ducts with heavy-duty polyethylene sheeting and fire-retardant duct tape; mandate safety goggles, cut-level 5 gloves, and hearing protection.
|
P
4
×
S
3
12
|
Implement rotation schedule to limit vibration exposure; conduct thermal imaging / dust checks before unsealing electrical equipment.
|
P
2
×
S
2
4
|
|
| 11 |
Torch-applied bituminous waterproofing membrane on substation roof/plinth
|
Open flame from LPG torches near combustible electrical insulation, cables, and cable trays
|
Major fire outbreak, explosion of nearby gas/transformer oil, structural damage, burn injuries
|
Waterproofing crew, substation operators, site personnel
|
Obtain Hot Work Permit; ensure 2x 9kg DCP and 1x CO2 fire extinguishers on hand; maintain minimum 1.5m clearance from cable penetrations; deploy fire-resistant ceramic blankets over exposed cable trays.
|
P
4
×
S
5
20
|
Designate a dedicated trained fire watch during work and for a minimum 60-minute post-work cool-down period; enforce combustible gas monitoring.
|
P
1
×
S
4
4
|
|
| 12 |
High-pressure chemical injection polyurethane grouting to seal leaking cable ducts and conduits
|
High injection pressure (up to 200 bar), hose burst, chemical splash of isocyanate/polyurethane resins
|
High-pressure injection injury, severe chemical eye damage, skin sensitization, acute respiratory irritation
|
Grouting operators, helpers
|
Inspect pump, hoses, and mechanical packers prior to pressurization; equip pump with calibrated pressure relief valves; mandate full-face shield, chemical safety goggles, chemical-resistant nitrile gauntlets, and chemical coveralls.
|
P
3
×
S
4
12
|
Install whip-checks on all high-pressure hose couplings; keep emergency eyewash station within 10 meters of application zone.
|
P
1
×
S
3
3
|
Activity Log
System
•
uploaded document for status: AEN
2 months ago
System
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uploaded document for status: AEN
2 months ago
System
•
created
3 months ago