Water proofing
DraftReference: RA-2026-OmHbccij
Total Activities
12
High Risk
4
Medium Risk
8
Low Risk
0
📄 Method Statement
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Risk Assessment Matrix
| SN | Activity | Hazard | Consequence | Groups Exposed | Controls | Initial Risk | Additional Controls | Residual Risk |
|---|---|---|---|---|---|---|---|---|
| 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
|
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