Contaminated Land Safety Awareness

Contaminated land contains hazardous substances from previous industrial use such as factories, gas works, and landfill sites.
Common contaminants include hydrocarbons, heavy metals, asbestos in soil, solvents, acids, and landfill gas.
Contaminated ground can harm workers through skin contact, inhalation of vapours and dust, and ingestion of particles.
A site investigation report should identify the type, extent, and concentration of contamination before construction begins.
Ground gases including methane and carbon dioxide can accumulate in excavations and confined spaces, creating explosion and asphyxiation risks.
Personal gas monitors must be worn during excavation on sites with known or suspected ground gas contamination.
Contaminated soil and groundwater must be handled, stored, and disposed of as controlled or hazardous waste.
Decontamination procedures including boot washing and PPE removal must be followed when leaving contaminated work areas.
A COSHH assessment must be prepared for each contaminant identified, specifying the required PPE and control measures.
Workers on contaminated sites must receive specific induction training covering the contaminants present and emergency procedures.

Health risk	Contact with contaminated soil causes skin disease, respiratory illness, and cancer — exposure must be controlled at all times.
Gas hazard	Methane and carbon dioxide from contaminated ground accumulate in excavations, causing explosions and asphyxiation without warning.
Legal duty	Environmental Permitting Regulations and COSHH 2002 require proper management of contaminated material to protect workers and the environment.

Do

Don't

Read the site investigation report and attend the contamination-specific induction.
Wear the PPE specified in the COSHH assessment for each contaminant type on site.
Carry a personal gas monitor during all excavation work on contaminated sites.
Follow decontamination procedures when leaving the contaminated work area.
Store contaminated soil in designated, lined areas to prevent cross-contamination.
Wash hands and face thoroughly before eating, drinking, or smoking on site.
Monitor excavations for unusual smells, discoloured soil, or liquid contamination.
Dispose of contaminated material through licensed waste carriers and disposal facilities.
Report any unexpected contamination such as buried drums, stained soil, or strong odours.
Ensure first aid provision includes treatment for chemical contact and ingestion.

DON'T start work on contaminated sites without reading the site investigation findings.
DON'T handle contaminated soil without the PPE specified in the COSHH assessment.
DON'T enter excavations on contaminated sites without a personal gas monitor.
DON'T leave contaminated work areas without following the decontamination procedure.
DON'T mix contaminated soil with clean material — keep them strictly separated.
DON'T eat, drink, or smoke without washing hands after working in contaminated areas.
DON'T ignore unusual smells, discoloured ground, or oily residue during excavation.
DON'T dispose of contaminated waste through normal site waste skips or routes.
DON'T disturb buried containers, drums, or unknown substances — stop and report.
DON'T assume clean-looking soil is uncontaminated — laboratory testing is the only confirmation.

See also: Ground Gas Monitoring | Asbestos in Soil Remediation

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