Thermal resistivity test
DraftReference: RA-2026-Nge0qHjE
Total Activities
12
High Risk
1
Medium Risk
11
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 , 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
|
Likelihood / Frequency
| Descriptor | Likely Frequency | Probability |
|---|---|---|
| Frequent | Occurs frequently | 5 |
| Often | Occurs several times per year | 4 |
| Likely | Has occurred more than once | 3 |
| Possible | Has occurred | 2 |
| Rare | Never occurred | 1 |
Risk Matrix — Probability × Consequence
| Probability | Consequence | ||||
|---|---|---|---|---|---|
| Insignificant (1) | Minor (2) | Moderate (3) | Major (4) | Catastrophic (5) | |
| Rare (1) | 1 | 2 | 3 | 4 | 5 |
| Possible (2) | 2 | 4 | 6 | 8 | 10 |
| Likely (3) | 3 | 6 | 9 | 12 | 15 |
| Often (4) | 4 | 8 | 12 | 16 | 20 |
| Frequent / Almost Certain (5) | 5 | 10 | 15 | 20 | 25 |
| 15 – 25 | Extreme Risk | Activity or industry should not proceed in current form. |
| 8 – 12 | High Risk | Activity or industry should be modified to include remedial planning and action and be subject to detailed EHS assessment. |
| 4 – 6 | Moderate Risk | Activity or industry can operate subject to management and/or modification. |
| 1 – 3 | Low Risk | No action required, unless escalation of risk is possible. |
Activity Log
System
•
updated matrix
3 months ago
System
•
updated matrix
3 months ago
System
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created
3 months ago