Marlborough Water Treatment Works
Client:
eight2O Partnership AlliancePrimary Client:
Thames Water Utilities LtdLocation:
Marlborough, WiltshireTimeline:
2018Key Facts:
- Water Treatment
- Multi apparatus hazards including two strategic aviation fuel lines
- Live working environment
Description:
Marlborough WTW is situated one kilometre south east of Marlborough off the Salisbury Road. Raw water is pumped from a suction well to be treated by super-chlorination and de-chlorination. Treated water is pumped by submersible borehole units to reservoirs at Salisbury Hill and Forest Hill.
This was a complex, technically demanding project undertaken in challenging circumstances. The site remained live and operational throughout the works. Only a small, restricted work area was available and access was limited. A substantial new housing construction site bounded the site. The two sites shared access ways. Work was undertaken on high pressure mains and in close proximity to multi cables, pipelines and mains including HV cables and two aviation fuel pipelines running to Gatwick and Heathrow airports.
The principal works comprised the design and construction of a run to waste pipeline; a 215 metre 315mm HDPE gravity main to divert waste process water and surface water run-off away from the site and back to groundwater via a new 32 metre deep soakaway borehole on the third party land. The scope included a new concrete diversion chamber, new headworks to the borehole in a chamber, actuated valves, a pressure sustaining valve, flow meters, MEICA equipment and construction works including new footpaths.