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Dolly the Dolerite Cutter started work on a sewerage scheme in Ayr, Scotland last month.

The 5.2m diameter Herrenknecht TBM is boring through Dolerite under the River Ayr for the £12.3M second phase of the Ayr interceptor sewer.

West of Scotland Water is in the middle of its £46M Ayr Sewerage scheme with the aim of improving water quality along the Ayrshire coast. The TBM has been customised to suit the local ground conditions after working on the Jubilee Line Extension in London.

Main contractor Byzak Contractors is expected to finish tunnelling by February 2000.

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