Former Gas Works Site

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Previous examples of our work include the investigation of contaminated soil, groundwater and gas and waste characterisation works at a prime central London residential development site for a leading developer.

Historically the site was formerly part of a gas works and a transport depot and the residential development comprised multi-storey structures with basements with both hard and soft external landscaping.

Our investigation comprised the design and execution of cable percussion boreholes installed with dual aquifer monitoring wells and trial pitting. Principal contaminants detected included in soils arsenic, poly-cyclic aromatic hydrocarbons and hydrocarbons, ammonia in groundwater and carbon dioxide gas.

Liaison with the client’s site team and regulatory authorities in relation to the findings resulted in the agreement of a cost efficient remedial strategy which meant the majority of the impacted soils could be retained on site while mitigating any potential risks to future residents and the minimum volume of impacted waste soils required to be removed were fully characterised, efficiently transported and sustainably reused at appropriate off-site facilities without entailing excessive cost to the project.

The verification of remedial measures was effectively completed achieving successful regulatory sign-off of the development’s environmental planning conditions.