Tunstall, East Riding, Yorkshire

Richard Pennock

Richard Pennock


Tel: 01423 276000 Email


Mason Clark Associates (on behalf of East Riding of Yorkshire Council)


  • Project Management
  • Phase 1 Desk Study
  • Intrusive Ground Investigation
  • Soil Analysis
  • Geotechnical Design
  • Interpretative Report


Flood alleviation embankment feasibility investigation

CGL was appointed by Mason Clark Associates (MCA) to assess the suitability of ground conditions at a site near Hull as part of a feasibility study into the construction of a flood alleviation embankment. The embankment was to span the Tunstall Drainage channel in order to provide a flood defense for locals against future storm events from the North Sea.

A scope of works was proposed by CGL and agreed with MCA to assess the suitability of the site. The scope involved undertaking one cable percussive borehole to depth in the centre of where the embankment would be constructed. This was supported by a number of shallow window sample boreholes along the length of the bund alignment.

CGL also assessed the suitability of the ‘site won’ materials for reuse in constructing the embankment. In order to undertake appropriate tests, a number of machine excavated trial pits were undertaken to expose the near surface ground conditions. In-situ testing was undertaken within the boreholes and bulk samples were obtained for analysis from the trial pits for earthworks testing.

Based on the results of the in-situ and laboratory testing CGL provided recommendations with regards to the design and construction of the embankment, groundwater control and the reuse of site-won materials.

In addition, a preliminary human health risk assessment was undertaken to asses any potential risks to construction workers. Comparison of the chemical analysis results to the published Soil Guideline Values and CGL’s in house derived Generic Assessment Criteria indicated that the risk of contamination to the potential receptors is very low.