Glossary of Terms

WM3 is the UK guidance used to classify waste and determine whether a material should be considered hazardous or non-hazardous. It provides a structured methodology for assessing waste based on its chemical composition and hazardous properties.

For construction and brownfield projects, WM3 is used to classify excavated soils, made ground and other materials before they leave site. The classification process reviews laboratory data alongside site history and identifies whether materials can be managed as inert, non-hazardous or hazardous waste.

Accurate WM3 classification is essential because it directly impacts disposal routes, treatment options, compliance obligations and project costs. Incorrect classification can lead to unnecessary hazardous soil disposal costs, delays and regulatory issues.

At Provectus Soils Management, we undertake WM3 assessments and can identify opportunities for supplementary testing where reclassification may reduce disposal costs.

Hazardous soil is soil that contains contaminants at concentrations that result in the material being classified as hazardous waste under UK regulations.

Common contaminants that can result in hazardous classification include:

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•              Hydrocarbons and petroleum products

•              Asbestos

•              Heavy metals such as lead, arsenic and mercury

•              Polycyclic Aromatic Hydrocarbons (PAHs)

•              Certain industrial chemicals and solvents

A soil is not automatically hazardous simply because contamination is present. Classification depends on the type of contaminant, its concentration and the hazardous properties assigned under WM3 guidance.

Understanding whether soil is hazardous or non-hazardous is one of the most important factors in determining treatment options, hazardous soil disposal routes and project costs.

Soil segregation is the process of separating materials into different stockpiles based on their contamination profile, physical characteristics or intended destination.

Rather than treating all excavated material as a single waste stream, segregation allows clean, inert, non-hazardous and hazardous materials to be managed separately.

Effective segregation can deliver significant benefits, including:

•              Lower contaminated soil removal and disposal costs

•              Increased reuse opportunities

•              Reduced landfill volumes

•              Improved sustainability performance

•              Greater cost certainty

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For example, a mixed stockpile containing 10% hazardous material may require disposal at hazardous waste rates. However, by segregating the hazardous component from the non-hazardous material, the overall project cost can often be reduced substantially.

Landfill Tax is a government levy applied to waste disposed of at landfill sites. The tax is designed to encourage recovery and recycling rather than disposal.

Where contaminated soils can be treated and recovered through approved soil treatment and recovery operations, rather than disposed of to landfill, Landfill Tax may not apply.

This can generate significant savings for projects handling large volumes of contaminated soils.

Through our strategic alliance with FCC, Provectus Soils Management can access treatment and recovery routes that allow qualifying materials to be beneficially reused, reducing disposal costs and supporting circular economy objectives.

Not all materials qualify, and each waste stream must be assessed individually to determine the most appropriate management route.

Hydrocarbon contaminated land is one of the most common issues encountered on brownfield sites and can arise from former industrial activities, fuel storage, vehicle maintenance operations and historic spillages.

Typicalcontaminants include:

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•              Diesel Range Organics (DRO)

•              Gasoline Range Organics (GRO)

•              Total Petroleum Hydrocarbons (TPH)

•              Oils and fuels

•              BTEX compounds

Depending on the contamination profile, hydrocarbon-impacted soils can often be treated and recovered rather than disposed of.

Treatment techniques may include:

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•          Bioremediation

•          Aeration and soil turning

•          Stabilisation and solidification

•          Soil processing and screening

•          Blending and treatment within permitted facilities

The objective is to reduce contaminant concentrations sufficiently to enable recovery and beneficial reuse wherever possible.

Hydrocarbon contaminated land is one of the most common issues encountered on brownfield sites and can Asbestos in soil is frequently encountered within made ground and demolition arisings on brownfield redevelopment sites.

The management approach depends on factors including:

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•              Type of asbestos present

•              Concentration

•              Whether asbestos is bonded or free fibres

•              Waste classification results

•              Site-specific regulatory requirements

Asbestos contaminated soils require careful handling, segregation and classification to ensure compliance and minimise costs.

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Through detailed assessment and waste characterisation, it is often possible to identify the most appropriate treatment, recovery or disposal route while maintaining full compliance with environmental regulations.

Provectus Soils Management specialises in the management of asbestos contaminated soils and works with clients to develop practical, compliant and cost-effective solutions.

A Materials Management Plan (MMP) is a documented strategy that demonstrates how excavated materials can be reused on-site or transferred between sites without being classified as waste.

Developed in accordance with the CL:AIRE Definition of Waste Code of Practice (DoWCoP), an MMP provides a framework for:

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•              Characterising materials

•              Demonstrating suitability for reuse

•              Managing material movements

•              Maintaining compliance records

•              Supporting sustainable development

MMPs can significantly reduce disposal costs by allowing suitable materials to remain within the construction process rather than entering the waste chain.

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Form any major infrastructure and redevelopment projects, an MMP forms a key partof the overall earthworks and sustainability strategy.

Soil Treatment Facilities (STFs) are permitted sites that receive contaminated soils for treatment, soil recovery and beneficial reuse.

Unlike traditional landfill disposal, STF operations focus on recovering value from excavated materials by treating contamination and incorporating suitable soils into restoration, engineering or land improvement projects.

Benefits of STF recovery routes include:

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•              Reduced hazardous soil disposal costs

•              Diversion from landfill

•              Potential landfill Tax exception savings

•              Improved sustainability outcomes

•              Supportfor circular economy objectives

Through our strategic alliance with FCC, Provectus Soils Management provides access to a nationwide network of treatment and recovery facilities capable of managing hazardous and non-hazardous soils.

This enables clients to access compliant, cost-effective and environmentally responsible alternatives to traditional disposal routes.