We draw on expertise in a comprehensive range of brownfield services which stretches back over 20 years both nationally and internationally.
Our services include:
Phase 1 - Preliminary RA (desk study)
The scope of a Phase 1 will vary depending on the requirements of the client.
Typically these are required to comply with planning conditions; to assess environmental liability associated with the acquisition or divestment of any property; or to establish the current environmental status and liabilities associated with property portfolios.
Typically a Phase 1 assessment will comprise a review of published data and site reconnaissance including:
- Historical map review
- Geological, hydrogeological and hydrological review
- Site walk over
- Regulatory liaison
- Conceptual site model
- Preliminary Qualitative Risk Assessment
- Overall identification of potential environmental issues & liabilities
Phase 2 - Site investigation
Commonly designed using information provided from a Phase 1, Phase 2 works comprise intrusive investigation tailored to the individual site to establish ground and groundwater conditions and to assess environmental status or potential for contamination. Royal HaskoningDHV has considerable experience in the design, procurement and supervision of ground investigations in accordance with current best practice, including:
- Soil, groundwater and sediment sampling
- Soil logging
- Ground gas surveys
- Hydrogeological assessment
- Scheduling & assessment of chemical analysis
- Waste characterisation
- Contractor selection through provision of tender documentation and tender evaluation
- CDM compliant H&S plans, risk assessments and method statements
- Factual and interpretative reporting
- Regulatory liaison
Risk Assessment and Groundwater Modelling
Risk assessment and groundwater modeling are at the heart of our contaminated land business. We aim to develop and implement risk-based and cost-effective solutions for all our projects. Highly qualified professionals in our Risk Assessment Team can ensure that projects undertaken for our clients benefit from full compliance with regulatory guidance such as Environment Agency’s CLR 11 Model Procedures, CLEA Technical Background report, Toxicological Assessment report and Remedial Target Methodology.
We also specialise in applying alternative models such as RBCA and BP Risc that are adapted to comply fully with UK regulatory guidance and we run regular risk assessment training courses in partnership with GSI Environmental Inc.
Our risk assessment services include:
- literature review of toxicological data and derivation of Tolerable Daily Intakes (TDI) for threshold contaminants and Index Doses (ID) for non-threshold contaminants (i.e carcinogens).
- assisting in design and implementation of site investigation programme
- formulating Conceptual Site Model (CSM) outlining Source-Pathway-Receptor linkages
- undertaking Generic Quantitative Risk Assessment (GQRA) to derive generic Assessment Criteria (GAC)
- undertaking Detailed Quantitative Risk Assessment (DQRA) based on site investigation findings to derive Site Specific Assessment Criteria (SSAC)
- integration of human health and controlled water risk assessment to derive Site Specific Remedial Targets (SSRT) for the purpose of site remediation.
- development of GACs for acute exposures such as hydrogen cyanide.
Our hydrogeology and groundwater modelling service can provide solutions for:
Groundwater Protection and Management
- conducting groundwater vulnerability studies
- defining the time-related groundwater protection zone (GPZ)
- evaluating conjunctive use of groundwater and surface water resources.
- quantifying river-aquifer interaction
- assessing hydrological and ecological effects of groundwater abstraction on stream flows.
Mining and Minewater Pollution
- modelling environmental impact associated with dewatering
- predicting the timing and rate of minewater rebound after the closure
- assessing environmental impact of minewater outbreak on surface water quality
- developing mitigation/remediation strategies
Phase 3 - Remediation
Should contamination be encountered and perceived to pose a risk through the processes outlined above, remedial measures may be necessary to remove or reduce the risk. Royal HaskoningDHV has developed remedial strategies involving the treatment of soil and groundwater for both large and small scale projects both internationally and within the UK using varied remediation technologies including:
- monitored Natural Attenuation (MNA)
- thermal desorption
- air sparging
- multi-phase soil vapour extraction
- pump & treat
- Permeable Reactive Barrier (PRB)
- hydraulic containment
The types of service we can offer are:
- development of remedial action plans
- remedial technology options appraisal
- feasibility studies
- bench trials/pilot scale schemes
- cost benefit analysis
- regulatory liaison
- permitting for abstraction licensing and discharge
- supervision and monitoring