Contaminated Soil Handling — Safe Work Method Statement
Safe Work Method Statement for the excavation, handling, classification, and removal of contaminated soils on brownfield and remediation sites, in accordance with Australian environmental and WHS requirements.
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Contaminated soil handling on construction and remediation sites involves dual regulatory obligations — WHS compliance to protect workers from hazardous substances, and environmental compliance to prevent contamination spreading to clean areas, groundwater, or receiving environments. A SWMS is required wherever workers may be exposed to hazardous contaminants through inhalation, skin contact, or ingestion during excavation, handling, stockpiling, or removal activities.
The nature of contamination determines the specific controls. Common contaminants encountered on Australian brownfield sites include petroleum hydrocarbons (BTEX, TPH), heavy metals including lead, arsenic, and chromium, polycyclic aromatic hydrocarbons (PAHs) from former manufactured gas plants or coal tar sites, organochlorine pesticides from agricultural sites, and per- and polyfluoroalkyl substances (PFAS) near defence or firefighting training sites. Site-specific chemical data from a Preliminary Site Investigation (PSI) or Detailed Site Investigation (DSI) conducted in accordance with the NEPM (Assessment of Site Contamination) 1999 (as amended 2013) must be reviewed before completing this SWMS.
Workplace exposure standards for specific contaminants are set out in the Safe Work Australia Workplace Exposure Standards for Airborne Contaminants. Where contaminant vapours or dusts may exceed these standards, air monitoring by a competent industrial hygienist is required. Workers must receive site-specific induction training on the contaminants present and the controls in place. Respiratory protection, coveralls, gloves, and safety footwear must be selected based on the contaminant SDS and HSE risk assessment.
To customise this template, attach the site contamination assessment data, identify each contaminant present and its concentration relative to health investigation levels in the NEPM, specify the waste classification under the relevant state EPA, and document the licensed waste transport and disposal pathway. Decontamination procedures for plant, equipment, and workers leaving the contaminated zone must be documented in detail.
This SWMS applies across all Australian states and territories. Environmental obligations — including waste classification, transport, and disposal — vary by state EPA and must be confirmed with the relevant authority before works commence.
Personal Protective Equipment
High Risk Construction Work Types
- •Work with or near hazardous chemicals
- •Work in or around excavations
Risk Assessment
1.Site investigation and contamination assessment
| Hazard / Risk | Initial Risk | Control Measures | Residual Risk | Responsibility |
|---|---|---|---|---|
| Workers entering a site with unknown contamination type or level | High | Do not commence ground disturbance on a potential brownfield site without a current Phase 2 Environmental Site Assessment (ESA) conducted by an accredited environmental consultant. Review the ESA to identify contamination types, locations, concentrations, and recommended exposure controls. Hold a site-specific contamination briefing for all workers before commencement. Provide all workers with a summary of identified contaminants, health effects, and the controls in place. Update the SWMS if new contamination types are identified during works. | Low | Environmental Consultant / Site Manager |
2.Excavation and classification of contaminated soil
| Hazard / Risk | Initial Risk | Control Measures | Residual Risk | Responsibility |
|---|---|---|---|---|
| Inhalation of volatile organic compounds (VOCs) during excavation | High | Monitor air quality at the excavation face using a calibrated PID (photoionisation detector) in real time during all excavation of potentially contaminated soil. Establish action levels — at 10 ppm, increase to full-face respirator with OV/P100 cartridge; at 25 ppm, cease excavation and ventilate; at 50 ppm, evacuate immediately. Keep excavator cab windows closed with cab on recirculated air during contaminated soil excavation. Place all excavated contaminated soil immediately into lined covered bays or lined stockpile areas to suppress vapours. | Moderate | Environmental Monitor / Excavator Operator |
| Cross-contamination between soil classifications | Moderate | Strictly segregate contaminated soil classifications as specified in the Remediation Action Plan. Label all stockpile areas clearly with contamination type and classification. Use separate plant for contaminated and clean soil handling where practicable — where the same plant must be used, decontaminate between uses. Document all soil movements in the site waste tracking register. Do not remove contaminated soil from site without a current waste tracking certificate from a licensed transporter. | Low | Site Manager / Environmental Consultant |
3.Loading and transporting contaminated soil
| Hazard / Risk | Initial Risk | Control Measures | Residual Risk | Responsibility |
|---|---|---|---|---|
| Contaminated dust escape during loading and transport | High | Apply water suppression or dust suppressant to all contaminated soil stockpiles and loading areas. Cover all truck loads with a fitted tarpaulin or mesh before leaving the site — no uncovered loads on public roads. Establish a wheel wash station at the site exit and require all trucks and plant to wash wheels before leaving the contaminated zone. Keep gate closed except during loading/unloading. Assign a trained traffic controller at the gate to enforce wheel wash compliance. | Low | Site Manager / Traffic Controller |
4.Decontamination of plant and equipment
| Hazard / Risk | Initial Risk | Control Measures | Residual Risk | Responsibility |
|---|---|---|---|---|
| Spreading contamination via plant tracked off-site | High | Establish a designated decontamination pad within the contaminated zone. All plant, vehicles, and equipment to be HEPA vacuumed and high-pressure washed at the decontamination pad before leaving the contaminated zone. Collect all wash water in a lined sump and dispose of as contaminated waste. Document plant decontamination in the site register. Decontaminate hand tools with a triple-rinse in clean water and detergent. | Low | Plant Operators / Site Manager |
5.Worker decontamination and health monitoring
| Hazard / Risk | Initial Risk | Control Measures | Residual Risk | Responsibility |
|---|---|---|---|---|
| Ingestion or dermal absorption of contaminants | High | Establish a worker decontamination station at the site exit with fresh water, soap, and single-use towels. Mandatory decontamination procedure: HEPA vacuum coverall, remove outer gloves, remove coverall without touching outside surface, remove inner gloves, wash hands and face. Prohibit eating, drinking, or smoking in contaminated areas. Provide biological monitoring (blood and/or urine testing) for all workers regularly exposed to heavy metals or persistent organic pollutants as per the HSE management plan. | Low | All Workers / HSE Manager |
Relevant Codes of Practice
Worker Acknowledgement
By signing below, I confirm that I have read, understood and agree to comply with this Safe Work Method Statement.