Febrication installation of concrete triugh
DraftReference: RA-2026-kTtni2QP
Total Activities
12
High Risk
2
Medium Risk
10
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 | Delivery, offloading, and site staging of precast concrete troughs and materials | Heavy vehicle movement, struck by suspended loads, pinch points during offloading | Severe crushing injuries, fractures, structural damage, fatalities | Riggers, banksmen, crane operators, transport drivers, site operatives | Traffic Management Plan enforced, dedicated offloading zone, certified lifting equipment and rigging accessories, trained banksman/slinger |
P
3
×
S
4
=
12
|
Establish rigid physical exclusion zones around lifting radiuses; mandatory pre-use inspection of crane/HIAB and slings; wind speed monitoring prior to lifts |
P
1
×
S
4
=
4
|
| 10 | Excavation and trench preparation for concrete trough routing | Underground electrical utilities strike, trench wall collapse, cave-ins | Electrocution, severe arc flash burns, engulfment injuries, fatalities | Excavator operators, groundworkers, site engineers | Review utility drawings, perform CAT and Genny ground scan, digging permit system, implement trench shoring or battering back of slopes |
P
4
×
S
5
=
20
|
Enforce hand-digging / soft excavation within 0.5m of verified utilities; continuous gas monitoring and competent person inspections of trench integrity |
P
1
×
S
5
=
5
|
| 11 | On-site cutting, trimming, and modification of concrete troughs | Inhalation of Respirable Crystalline Silica (RCS) dust, tool kickback, flying debris, high noise levels | Silicosis, occupational asthma, severe lacerations, eye injuries, Noise-Induced Hearing Loss (NIHL) | Power tool operators, masonry workers, nearby site personnel | Wet-cutting suppression systems or integrated M-class dust extraction, safety guards on cut-off saws, mandatory PPE (FFP3 respirators, impact goggles, ear defenders) |
P
4
×
S
3
=
12
|
Pre-use inspection of cutting discs and arbor fitment; HAVS (Hand-Arm Vibration) exposure time tracking; job rotation for operators |
P
2
×
S
2
=
4
|
| 12 | Mechanical lifting and lowering of concrete troughs into the excavation trench | Failure of lifting tackle, dropped loads, encroachment near overhead powerlines | Crushing injuries, electrocution, equipment destruction, fatal strikes | Lifting team, groundworkers inside trench, excavator/crane operators | Approved Lift Plan, certified lifting beams/slings, safety latches on hooks, clear line-of-sight communication via radio or standard hand signals |
P
3
×
S
5
=
15
|
Maintain mandatory clearance distances from overhead powerlines; use tag lines to guide loads (no direct hand contact on suspended troughs); keep operatives out of trench while load is above |
P
1
×
S
4
=
4
|
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