www.stuartwells.co.uk Case Study – HST Shaft: Llanberis WwTW Abstract An 9no. deep well dewatering system for a 12.5m Ø shaft at Llanberis WwTW in Gwynedd. The shaft formed part of a new Humus Sedimentation Tank within the existing works and was constructed to 5.9m depth. Ground conditions consisted of Alluvium Fan Deposits with course Sand and Gravels overlying the Llanberis Slate Formation. Groundwater level was at nominal 2.0m BEGL. Groun

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