Contaminated Land Assessment and Remediation

Tetra Tech delivers integrated contaminated land and remediation services to support safe, sustainable site development and compliance with environmental regulations. We help clients navigate the complexities of land contamination and maximise the potential of their land through innovative, risk-based approaches tailored to project and client needs.

Our multidisciplinary teams provide end-to-end support, from initial risk assessment and investigation through to remediation design, implementation, and verification. We combine robust scientific analysis with deep regulatory knowledge to deliver practical, future-ready solutions for brownfield regeneration, infrastructure, and industrial clients.

Environmental Site Assessment and Risk Analysis

We offer comprehensive assessment and modelling services to understand contamination risks and inform decisions for planning and development, permitting, and environmental due diligence.

• Phase 1 preliminary risk assessments
• Phase 2 intrusive site investigations
• Human health and controlled waters risk assessments
• Contaminant fate and transport modelling
• Generic and detailed quantitative risk assessments (GQRA and DQRA)
• Vapour intrusion and radon assessment
• Ground gas investigation, risk assessment, and risk mitigation design

PFAS and Emerging Contaminants

Our team provides comprehensive PFAS services from source identification and forensic analysis to predictive modelling, treatment system design, and advanced destruction.

• PFAS management strategies
• Preliminary risk assessment and source identification
• Site investigation, sampling, and forensic analysis
• Predictive modelling
• Remedial design and treatment
• PFA Scrub system cleaning and validation for aqueous film-forming foam (AFFF) transition
• Regulatory compliance and risk management
• Catchment assessment and modelling

Remediation Strategy Design and Verification

Our team provides complete remediation solutions, ensuring regulatory compliance and cost-effective, sustainable reuse of land.

• Development of remediation options appraisals
• Remediation strategy design and regulator liaison
• Specialist Qualified Persons (SQP) for remediation strategy declaration under the National Quality Mark Scheme to accelerate regulator acceptance
• Innovative and sustainable remedial technologies
• Contractor procurement, management and supervision
• On-site remediation delivery and verification
• Validation reporting and stakeholder engagement
• Support for regulatory sign-off and planning conditions discharge

Remediation Project Management

Our team provides complete remediation solutions to support clients to meet requirements and use the best available technology, while verifying that the remediation is completed in accordance with the strategy and statutory requirements.

• Project management
• Risk management and safety services
• Planning services
• Environmental assessment and reporting
• Full design services including design of remediation and protections systems; capping, liners, gas and leachate management systems, surface water management and SCADA systems
• Contractor and specialist procurement and contract strategy
• Contractor management and supervision
• Contract administration

Contamination Assessment for Planning and Development

Our team supports clients with contaminated land advice throughout the planning and development process. We provide advice on site selection and constraints mapping, environmental assessment to support planning applications and Environmental Impact Assessment and provide on-going support with condition discharge and risk mitigation during construction.

• Site selection, constraints mapping and design optimisation, based on environmental ground conditions
• Abnormal costs assessment
• Environmental assessment for new planning applications
• Ground conditions chapters for environmental impact assessment
• Support with discharge of environmental planning conditions
• Construction environmental management plans
• Watching brief and ad-hoc support during construction
• Stakeholder and community engagement
• Regulator liaison and sign-off

Environmental Permitting Support

We support clients with managing environmental permits, from new permit applications and site baselining through on-going compliance and risk assessment, permit modifications and transfers to supporting with site closure and permit surrender.

• New permit applications
• Site baseline characterisation
• Hydrogeological risk assessments
• Compliance monitoring
• Regulation 61 monitoring and support
• Remediation options appraisal, strategy design and implementation
• Verification testing and reporting
• Site condition reports
• Regulator liaison
• Support with site permit surrender applications
• Environmental due diligence services

Material and Waste Management

We support effective material reuse and disposal planning in line with UK and EU regulations, promoting sustainable and cost-effective solutions and working to meet individual project targets and timescales

• Waste classification and soil management plans
• Materials management planning under CL:AIRE Definition of Waste: Code of Practice (DoW:CoP)
• Facility decommissioning and closure planning
• Support for environmental permitting
• Assessment of hazardous substances and new/emerging contaminants

Regulatory Support

Our experts provide authoritative advice to support compliance with environmental regulations.

• Assessment under Part 2A of the Environmental Protection Act 1990 and other environmental legislation
• Managing 3rd party liability associated with contaminated land ownership
• Management of discharge and trade effluent consents
• Expert witness services
• Planning and permitting consultation