10
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The project is an important development for Seaton, in the east of Devon
Demetriou adds: “The dredging process involved a 12-week
enabling programme, which included installing the pipeline and temporary bridges across public highways, as well as the con- struction of the reception pits. The actual dredging process itself took just four weeks to complete with all the material derived from licensed underwater sea quarries.” Each load was turned around in 36 hours with approximately
13 cu m of sand and aggregates pumped ashore every second. To receive each load, ISG’s team built two reception pits and a main lagoon that were surrounded by 4m high earth mounds. The pits and lagoon were lined with a geotextile membrane to prevent any issues with contamination of the existing ground with regard to salinity. Each load delivered 14,000 cu m of sand and gravel. With that
delivery came another 25,000 cu m of seawater and the entire payload went into one of the reception pits and the water made
its way to the lagoon controlled by water boxes. With the pump and pipeline needing to be constantly monitored in case of blockages, this meant through the night working for the con- struction team during deliveries. The sand needed the seawater to prevent blockages in the
pipe, but once delivered the 25,000 cu m of seawater from each delivery had to be safely removed from the site. ISG brought in two V12 engines and this process took between four and five hours, while the site team used a fleet of kit, including four 45- tonne excavators, blades and three powered rollers to disperse the sand. For the initially wary locals, the innovative method used to fill
the site proved an attraction. ISG erected a viewing platform and around 1,500 people a week would come to watch as the 300,000 cu m of sand was pumped on site. To reduce settlement issues with regard to the existing
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