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Reference: RA-2026-zAD0xZrO

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Method Statement for Geophysical investigation works (TAQA).pdf

AP • Aug 14, 2026 06:35 • 880.4 KB
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DTS-049 Method of Statement for Trial Pits Excavation RB.pdf

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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
Site mobilization and equipment unloading
Manual handling of heavy thermal resistivity test kits, calibrators, and portable generators
Musculoskeletal injuries, back strain, foot crush injuries from dropped equipment
Site Personnel, Subcontractors, Public
Team lifting for objects exceeding 20kg, utilization of wheeled transport cases, pre-task ergonomic briefing
P 3 × S 3
9
Mandatory safety boots with metatarsal protection, mechanical lifting aids for heavy battery packs and generators
P 2 × S 2
4
10
Underground utility identification and ground scanning prior to probe insertion
Striking buried live high-voltage power cables or gas pipes during probe installation
Electrocution, arc flash explosion, severe thermal burns, fatal injury
Site Personnel, Subcontractors, Public
Review of site utility drawings, CAT and Genny ground scanning across test location grid
P 4 × S 5
20
Permit to Dig / Penetration Permit issuance, mandatory hand digging / trial holes before mechanical probe insertion
P 1 × S 5
5
11
Driving thermal resistivity needle probes into soil/backfill
Flying soil/rock debris, high noise from impact hammers, pinch points on slide hammers
Eye impact injuries, localized hand/finger crush injuries, hearing damage
Site Personnel, Subcontractors, Public
Basic PPE (safety glasses, standard leather gloves), visual check of hammer tools
P 4 × S 3
12
Mandatory impact-resistant gloves (ANSI level 3), SNR 28dB hearing protection, established 2-meter exclusion zone
P 2 × S 2
4
12
Setting up electrical power supply and test unit wiring
Exposed electrical terminals, damaged insulation on test leads, short circuits
Electric shock, electrical burns, equipment damage
Site Personnel, Subcontractors, Public
Pre-use visual inspection of test cables, connectors, and insulated tools
P 3 × S 4
12
Deployment of Residual Current Devices (RCD/GFCI) on power sources, portable test unit PAT testing verification prior to site entry
P 1 × S 3
3