Human health
We offer DQRAs for sites where the GQRA has identified exceedances of soil assessment criteria or where asbestos in soil has been identified. We have extensive experience in using the Environment Agency’s contaminated land exposure assessment (CLEA) model and BP RISC and RBCA tools. For contaminants such as arsenic, lead and cadmium, we can undertake a DQRA using laboratory bioaccessibility test data. This is particularly relevant in areas of the UK where there is naturally occurring arsenic, nickel and lead. Refining soil assessment criteria to be more site specific can negate or reduce the need for remediation, leading to a more sustainable and cost-effective outcome.
Controlled waters
Our team undertakes DQRAs for controlled waters relating to surface water, groundwater, drinking water supplies, sustainable drainage systems and environmental permit discharge consents. Through deriving remedial targets, using data collected during an intrusive investigation, we can advise a client of their potential liabilities. Should a DQRA be required, we can develop the most appropriate remedial site strategy. Our specialists can also assess sites with non-aqueous phase impact and develop appropriate remediation and remedial targets. Our staff have extensive experience in using the Environment Agency’s remedial targets methodology, together with other remediation models and assessment techniques.
Ground gas assessments
During the development of new build houses, local planning authorities and future house buyers need to be assured that the development is safe from any ground gas risks. For that reason, the understanding and assessment of ground gas, together with the independent verification of gas protection systems, are required to be signed off by regulators for the protection of human health. During the construction phase, there is a great potential for ground gases to cause serious harm in the form of intoxication and explosion. When a site is high risk, we undertake verification of gas membranes using techniques including air lance and dielectric testing. These methods are highly efficient; they cover a large area in a relatively short time and pinpoint defects in membrane integrity.
