A basement was proposed to 4.25m below the ground level. The site was located on dense granular soils associated with the Kempton Park Gravel Member. The ground was so dense that the rig used was unable to drill to the proposed basement level. Given the experience, knowledge and resources Ground & Water has in the Belgravia area, the geological conditions (density/strength of soils and the top of the London Clay Formation) and hydrogeological conditions (groundwater level) could be inferred. This could lead to accurate and acceptable settlement/heave analysis of the basement.
Not only do these projects require high level analysis of settlement, heave and movement of surrounding ground, they must comply with the guidance for basements documented by the Borough of Westminster. A way of overcoming ground access difficulties and complex ground movement issues had to be found.