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Second Irish contract for Norwest Holst

NORWEST HOLST Soil Engineering has finished the field work phase of its second major ground investigation contract in the Republic of Ireland in the past 12 months.

The firm carried out more than 1100m of cable tool boring and 1500m of rotary coring on the 12 week, £1M contract for the IR£90M (£72M) South Eastern Motorway around Dublin.

The contract was supervised by geotechnical consultant Bernard Murphy & Associates, for project engineer MC O'Sullivan & Company.Client is Dun Laoghaire - Rathdown County Council.

Norwest Holst used 16 rigs and a 12-strong technical team to complete some 300 boreholes and trial pits through hard glacial deposits and into the strong underlying Northern and Upper Liffey Granites and metamorphic rocks down to depths of 45m.

Ten 25t plate bearing tests were carried out using an adapted six-wheel wagon.Blasting trials and geophysical surveys plus borehole fracture surveys were also undertaken.

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