Following completion of a Phase 2 Site Contamination Assessment it may be necessary to carry out further detailed quantitative risk assessment (DQRA) of specific features, such as the risks posed to human health from ground gas and hydrocarbon vapours and environmental receptor such as groundwater and surface water features.

The latest modelling techniques and software are employed. For the derivation of soil guideline values and for human health DQRA the following methods and software are employed:

• CLEA v1.06

• LQM/CIEH

• Generic In-house Assessment Criteria

• CIRIA Guidance for ground gas risk assessment (C665 and R149 for example)

• BP RISC

• RCLEA

For the assessment of risks to controlled waters the following methods and software are employed:

• Environment Agency Remediation Targets Methodology and Spreadsheet (formerly know as R&D P20)

• ESI RAM