Project Dewatering have played a vital role in the extension of the Stoke Bardolph Sewage Treatment Works, Nottinghamshire. The works are located 1km West of the River Trent and 1km North West of the village of Stoke Bardolph. The extension involved the construction of a 156m x 75m Activated Sludge Plant Tank and 8no. x 36mØ Final Settlement Tanks all located within the Severn Trent site.
All structures are within open-cut excavations in the Holme Pierrepoint Sand & Gravel member which in turn overlays Mercia Mudstone. The Dewatering System encompassed an area of 35,000m², and consisted of a single stage array of over 800 wellpoints installed around the perimeter of the excavation using conventional water-jetting techniques. The wellpoints were pumped by 12no. 150mmØ 415V Geho ZD900 piston dewatering pumps located around the external perimeter. Groundwater levels were reduced from 18.5mAOD to 14.0mAOD
