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Reference: RA-2026-Nge0qHjE

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Thermal resistivity test

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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 , visitor
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
Unloading and manual handling of thermal resistivity testing equipment (TR meters, battery units, drive rods)
Heavy lifting, awkward postures, and repetitive physical strain
Musculoskeletal disorders (MSDs), back injuries, and foot/finger crush injuries
Field technicians and site engineers
Conduct dynamic risk assessment, utilize team lifting for items over 20kg, deploy wheeled transport carts on site, and wear safety footwear (steel-toe).
P 4 × S 3
12
Mandatory manual handling training and strict enforcement of a maximum single-person lifting limit of 20kg.
P 2 × S 2
4
10
Underground utility scanning prior to probe insertion or excavation
Striking live underground electrical cables or gas mains during soil probing
Severe electrocution, electrical arc flash, explosion, thermal burns, and fatality
Field technicians, drillers, and nearby site workers
Obtain service drawings, issue Permit to Dig, perform Cable Avoidance Tool (CAT) & Signal Generator scanning by certified operators.
P 3 × S 5
15
Hand-dig pilot trial holes (hand-augering) down to target depth before inserting metallic thermal probes.
P 1 × S 4
4
11
Hand augering or soil sampling hole preparation for needle probe insertion
Sharp objects in soil, rotating tool handles, and flying soil debris
Lacerations, puncture wounds, hand injuries, and eye impact injuries
Field testing technicians
Wear EN388 Cut Level 5 safety gloves, safety impact glasses, and inspect hand tools prior to work.
P 4 × S 2
8
Ensure task rotation every 20 minutes to prevent muscle fatigue and loss of grip control.
P 2 × S 1
2
12
Driving thermal needle probes into hard or compacted soil
Probe bending or snapping under impact, high reaction forces on operator's hands
Pinch injuries, hand impact trauma, sharp metal projection from broken probes
Field technicians
Use specialized slide hammers/alignment guides designed for probe installation; wear impact-resistant gloves.
P 3 × S 3
9
Pre-drill a pilot hole using an appropriate pilot bit rather than forcing probes in high-density soils.
P 1 × S 2
2