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Two-day wonder

Site investigation contractor Andrews Survey has recently finished an extremely fast investigation for a new ferry and cargo jetty at Nor th Kil linghome in the Humber Estuary.

The 420m long facility, comprising berthing and approach jetties, is being constructed by contractor Edmund Nuttall for the Simon Storage Group. It will be built on tubular steel piles founded through alluvial deposits and into the underlying chalk bedrock.

The investigation aimed to prove the depth of the chalk rockhead across the entire site in just 48 hours, with interpreted results available as each test was completed, allowing Nuttall to fine-tune the investigation as it progressed.

Andrews used a 100kN Roson cone penetrometer to test down to 16m below the seabed, up to 2m into the partly weathered chalk.

Sixteen CPTs were carried out from the work boat in 36 hours.The firm also provided a full positioning and survey package including bathymetry to determine the true seabed level at each investigation position.

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