Plate Compactor & Wacker Packer Operations SWMS

Plate compactor and wacker packer operations are routine on civil, drainage, paving and landscaping sites for compacting subgrade, sub-base, trench backfill and paver bedding. Despite the equipment's small footprint, these tasks expose operators to hand-arm vibration well above the AS/NZS ISO 5349:2013 daily exposure action value, sustained noise above 85 dB(A), petrol/diesel exhaust accumulation in trenches, and serious foot crush risk from a machine that can weigh 80–200 kg and walk unpredictably on slopes. WHS Regulation 2025 Part 4.5 (Plant) and the corresponding Hazardous Manual Tasks and Noise provisions impose a duty on the PCBU to identify these risks, apply the hierarchy of control, and document the safe system of work before the task starts. A SWMS is mandatory where the work meets High Risk Construction Work criteria — including work near energised services, in trenches, or where plant interacts with workers on foot — and must be developed in consultation with operators under s47–48.

Hazards identified

7 hazards covered, sorted by priority.

Control measures

Hierarchy-of-controls order: elimination → substitution → isolation → engineering → administrative → PPE.

1. 1Elimination — Where practicable specify self-compacting fill (controlled low-strength material) or design out compaction in confined trenches by using flowable backfill per AS 3798.
2. 2Elimination — Eliminate operator presence in deep narrow trenches by using remote-controlled trench rollers or excavator-mounted compaction wheels for backfill below 1.5 m.
3. 3Substitution — Substitute petrol units with low-vibration diesel or battery-electric compactors rated below 2.5 m/s² declared vibration to remove exhaust hazard and reduce HAVS exposure.
4. 4Substitution — Substitute heavier plates with reversible vibratory rollers on larger pads to reduce passes, total trigger time and cumulative A(8) vibration dose per operator.
5. 5Engineering — Fit anti-vibration handle isolators, maintain dampers per manufacturer schedule, and use manufacturer-supplied exhaust extensions directing fumes away from operator breathing zone.
6. 6Engineering — Provide forced mechanical ventilation in trenches deeper than 1.2 m with continuous CO monitoring and alarm set at 30 ppm per AS 2865 confined space principles.
7. 7Administrative — Rotate operators on 30-minute task cycles tracked on the SWMS sign-on sheet to keep daily vibration dose below the AS/NZS ISO 5349:2013 action value.
8. 8Administrative — Conduct pre-start inspection covering throttle, deadman, handle isolators, fuel lines and exhaust; isolate and tag out any unit failing inspection per WHS Reg s213.
9. 9PPE — Issue Class 5 SLC80 earmuffs or dual hearing protection above 100 dB(A), AS/NZS 2210.3 safety boots with steel midsole and metatarsal guard, and P2 respirator when compacting dry granular fill.
10. 10PPE — Provide impact-resistant anti-vibration gloves compliant with AS/NZS 2161.3, high-visibility long sleeves, and safety eyewear to AS/NZS 1337.1 against ejected stone.

Applicable Codes of Practice

High-Risk Construction Work triggered

Worked example

On a suburban stormwater upgrade, a leading hand opens the pre-start brief at the trench using the Plate Compactor SWMS as the talking document. The crew is backfilling a 1.8 m deep trench in 300 mm lifts over a new 375 mm RCP. Reading the hazard register, the leading hand identifies three live risks: CO accumulation (trench depth >1.5 m), HAVS on the 120 kg petrol wacker, and foot crush on the sloped trench edge. He selects the SWMS-listed controls — switching to the yard's battery-electric reversible plate, setting a 30-minute operator rotation between two competent workers tracked on the sign-on sheet, and positioning a portable axial fan at the trench mouth. Each operator signs onto the SWMS acknowledging the rotation schedule and confirming metatarsal-guard boots are worn. Mid-task, a third lift produces visible dust because the imported sand is drier than specified; the operator stops, the leading hand returns to the SWMS dust control line, and the crew water-conditions the lift with a hand lance before resuming. At smoko, the SWMS rotation log shows one operator approaching 90 minutes cumulative trigger time, so he is reassigned to spotting while the other completes the final lift, keeping both workers below the AS/NZS ISO 5349 action value for the shift.

Related legislation

• WHS Act 2011 (model)
• WHS Regulation 2025
• AS 2294 — Earth-moving machinery; Plant safety CoP

Frequently asked questions