As part of the diverse business offering, Environmental Management Solutions specialise in Contaminated Land and Geo-technical Investigations. Our services include Phase One Desk Studies – the following is an example of a job we carried out recently for a housing association.
Our expert Geo-technical investigation team were sent to a greenfield site in Kent to undertake investigations on behalf of a local housing development company.
The investigation began with a Phase One Desk Study which revealed no previous development at the site. Published geological maps indicated the site to be underlain by chalk, which is known to be susceptible to dissolution features (caused by dissolving of the calcium carbonate chalk rock). The intrusive investigation took the form of a series of machine excavated trial pits. The trial pits revealed a mixture of clay and cobbles overburden, underlain by chalk in various weathering states. A small solution feature was identified in just one of the trial pits.
Recommendations were made for the use of strip/trench fill foundations, with incorporation of steel reinforcement to help protect against subsistence related to solution features. Careful inspection of foundation excavations was also recommended. Our team also suggested that clay shrinkage/heavy potential (based on plasticity index/Atterberg limit tests), on chemical contamination status, and on soak away drainage potential.