Contaminated Land RAMS: What Contractors Need Before Breaking Ground

Table of Contents

• Contaminated Land Earthworks: The Key Risks
• Legal Framework: CDM 2015, COSHH, and Contaminated Land Regulations
• Phase 1 Desk Study and Phase 2 Investigation
• Common Soil Contaminants and Their Health Risks
• COSHH for Contaminated Soil Handling
• What Your RAMS Must Cover
• Frequently Asked Questions
• Next Steps

Contaminated Land Earthworks: The Key Risks

Brownfield development — building on previously developed land — is central to UK housing policy, but it creates significant health and safety challenges for contractors. Contaminated land may contain a wide range of hazardous substances from former industrial uses: heavy metals, hydrocarbons, asbestos, solvents, and biological contamination. Disturbing contaminated ground during earthworks creates exposure risks for operatives, risks of environmental harm, and complex waste management obligations.

Before breaking ground on potentially contaminated land, your RAMS must demonstrate that you understand the nature of the contamination, have assessed the risks to your operatives, and have implemented controls to prevent exposure. This guide explains what that means in practice.

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Legal Framework: CDM 2015, COSHH, and Contaminated Land Regulations

The key legislation governing earthworks on contaminated land includes:

• CDM 2015 — The Principal Designer must provide contractors with pre-construction information about any known or suspected contamination. Contractors must assess and manage the risk in their RAMS.
• COSHH Regulations 2002 — Contaminated soil and groundwater may contain hazardous substances. COSHH assessments must be prepared for all identified contaminants.
• Environmental Protection Act 1990, Part IIA — Defines contaminated land and the regime for identifying and remediating it. Contractors must understand that disturbing contaminated land may trigger regulatory notifications.
• Contaminated Land (England) Regulations 2006 — Implements Part IIA and provides the detail of the contaminated land regime in England.
• Hazardous Waste Regulations 2005 — Contaminated soil may be classified as hazardous waste. Consignment notes and licensed disposal routes are required.
• Environmental Permitting (England and Wales) Regulations 2016 — Certain soil management activities may require an Environmental Permit.

Phase 1 Desk Study and Phase 2 Investigation

Before writing RAMS for earthworks on potentially contaminated land, you should have access to ground investigation reports. Your RAMS must reference these and demonstrate that the contamination profile has informed the risk assessment and control measures.

• Phase 1 Desktop Study — Reviews historical maps, records, and available data to assess potential contamination sources. Every brownfield project should have a Phase 1 report. If one has not been provided in the pre-construction information, request it before work begins.
• Phase 2 Intrusive Investigation — Trial pits, boreholes, and soil and groundwater sampling to characterise the actual contamination present. Phase 2 reports provide the laboratory analysis data needed to write COSHH assessments for specific contaminants.
• Remediation Strategy — For significantly contaminated sites, a remediation strategy report describes how contamination will be managed. Your RAMS should align with the remediation strategy.

If no ground investigation data is available for a site with a history of industrial use, this is a significant red flag. Work should not proceed until appropriate ground investigation has been carried out and the results reviewed.

Common Soil Contaminants and Their Health Risks

Your RAMS must identify the specific contaminants present at your site based on ground investigation data. Common contaminants on UK brownfield sites and their health risks include:

• Total petroleum hydrocarbons (TPH) — Found on former petrol stations, industrial sites, and vehicle depots. Inhalation of vapours, skin absorption, and soil ingestion are the primary exposure routes. Some fractions are carcinogenic.
• Heavy metals (lead, cadmium, arsenic, chromium) — Widespread on former industrial, mining, and landfill sites. Health effects vary by metal and exposure level — lead is particularly harmful to the central nervous system. Ingestion and inhalation of dusts are the primary exposure routes.
• Asbestos in soil — Found on former demolition sites and where demolition waste has been used as fill. Asbestos in soil is treated differently to asbestos in buildings — see CIRIA C733 guidance. Licensed disposal is likely required.
• Polycyclic aromatic hydrocarbons (PAHs) — Associated with gasworks, coking plants, and wood treatment facilities. Carcinogenic. Skin contact and inhalation are the primary exposure routes.
• Volatile organic compounds (VOCs) — Found on former dry cleaning premises, chemical works, and fuel storage sites. Rapid vapour generation when soil is disturbed. Confined space risks in excavations.
• Biological contamination — Landfill sites and former sewage works may contain pathogenic organisms, including Leptospira (Weil's disease), hepatitis viruses, and tetanus. Skin contact via cuts or grazes is the primary route.

COSHH for Contaminated Soil Handling

Individual COSHH assessments must be prepared for each identified contaminant type. Your main RAMS should reference these and specify the control hierarchy for each. Common controls include:

• Dust suppression — Water sprays or misting systems during mechanical excavation and loading. Critical for heavy metal contamination, PAHs, and asbestos.
• Respiratory protection — Type and class depends on the contaminant. Asbestos in soil requires P3 RPE minimum. Heavy metal dusts may require P3 depending on exposure levels. VOC environments require OV/P3 combination cartridges or air-fed RPE.
• Skin protection — Chemical-resistant gloves (nitrile for most contaminants, specific types for VOC/solvent sites), coveralls, and appropriate footwear.
• Personal hygiene — No eating, drinking, or smoking in contaminated areas. Wash facilities with hot water, soap, and nail brushes must be provided. PPE contaminated with soil must not be worn into welfare facilities.
• Air monitoring — Particularly important for VOC-contaminated sites. Continuous monitoring in excavation areas for organic vapours and oxygen depletion. Calibrated equipment with audible alarms.

What Your RAMS Must Cover

• Reference to ground investigation reports (Phase 1 and Phase 2 where available)
• Summary of contaminants identified and their health risks
• COSHH assessment references for each contaminant type
• Dust suppression plan
• RPE specification for each task and contaminant type
• Skin protection and personal hygiene requirements
• Air monitoring arrangements for VOC or asbestos-contaminated sites
• Welfare facilities: wash facilities, clean change area
• Waste management: classification (hazardous or non-hazardous), consignment notes, licensed disposal
• Groundwater and surface water protection measures
• Emergency procedures: significant find of unexpected contamination, operatives showing signs of exposure
• Environmental monitoring and reporting obligations
• Competency requirements: geo-environmental trained supervisor

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Frequently Asked Questions

Q: What happens if we find unexpected contamination during earthworks?
A: Work in the affected area must stop and the supervisor must be notified immediately. The unexpected contamination must be investigated before work proceeds. The principal contractor and client must be informed. If the contamination may affect adjacent land or groundwater, the Environment Agency may need to be notified. A COSHH assessment for the newly identified contaminant should be prepared before work resumes.

Q: Is contaminated soil always classified as hazardous waste?
A: Not always. Classification depends on the type and concentration of contaminants present, assessed against hazardous waste criteria. A geo-environmental consultant should advise on waste classification based on soil analysis results. If in doubt, treat the material as hazardous and use a licensed hazardous waste facility.

Q: Do we need an Environmental Permit for contaminated soil movement?
A: This depends on the quantities and the destination. The Environmental Permitting Regulations include exemptions for certain soil management activities. For significant quantities of contaminated soil, an environmental permit or a formal exemption registration may be required. Your environmental consultant should advise.

Next Steps

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