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National Grid Gasworks

Project Summary

Ground investigation work was undertaken on a large gasworks site in East London. Two shell & auger rigs and two multi-purpose rotary rigs were used to drill boreholes to a maximum depth of 60m. The boreholes locally penetrated the full geological sequence of made ground, Alluvium, Terrace Gravels, London Clay, Lambeth Group, Thanet Sand and Chalk.

Project Details

Ground investigation work was undertaken on a large gasworks site in East London. Two shell & auger rigs and two multi-purpose rotary rigs were used to drill boreholes to a maximum depth of 60m. The boreholes locally penetrated the full geological sequence of made ground, Alluvium, Terrace Gravels, London Clay, Lambeth Group, Thanet Sand and Chalk.

Brief description of works

  • Twenty-one boreholes to between 10m and 30m depth were drilled by multi-purpose rotary rigs using percussive sampling techniques.
  • Eleven cable percussive boreholes to between 20m and 52m depth. Boreholes were drilled using 300mm, 250mm, 200mm and 150mm diameter casing and tools.
  • Five shell & auger boreholes extended by rotary follow on to a maximum depth of 60m in the chalk by multi-purpose rotary rigs using percussive sampling and water flush rotary coring techniques.
  • Boreholes installed with 63mmOD water monitoring wells up to 60m in depth.
  • Contract value > £200,000.
  • 780m of drilling completed.

Client Comments

“Overall a very good service.”

“The drillers from CCGI were all excellent! They took the lead on site and acted as a foreman in addition to drilling. I think the job ran smoothly because someone on site from CCGI took charge. All the drillers worked hard in difficult conditions.”

“The shell & auger drillers and the Dando 3000 made light work of the deep 50m boreholes. The drillers were excellent.”

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