Case Study: Probyn Close, Kimpton

Our Engineer Alan Griffin undertook the engineering design at this Croudace development in Kimpton. The development consisted of 31no. plots. The site was contaminated, sloping at over 10% and affected by solution features. A Section 278 was required for a new bellmouth and a Section 104 and 106 required for the foul sewer connection. Alan provided a full civil and structural engineering design for the site, got NHBC approvals and secured approval of the statutory agreements. 

Alan optimised the levels design by volumetric analysis of the earthworks (including the remediation works) whilst comparing against the cost of required retaining walls. Considering the risk of solution features Alan optimised the foundation design by agreeing a reinforced trenchfill solution with the NHBC supported by Perth Penetrometer testing. Testing was undertaken on each foundation to check the subgrade bearing capacity. A single plot was found to have below desirable bearing capacity and Alan promptly designed and provided a piled solution. This approach avoided unnecessary piling and reduced the foundation costs by £215,000. The surface water drainage solution utilises a flat permeable access road and a gravel filled soakaway. 

The drafting work was undertaken in AutoCAD with modelling in PDS, MicroDrainage, Tekla TEDDS and AutoTrack as required.