NEWS AMP5 TRACKER
Rigs test River Thames ground conditions
Bollfilter field engineer Liam Fitzpatrick (left) with Matt Rayson, Anglian Water site engineer, beside a skid-mounted Boll Filter at Isleham Site
Maintenance framework signed Anglian Water has signed a framework agreement with Bollfilter UK to provide a three-year maintenance and repair contract for all of its Boll Nitrate Removal Plant (NRP) Protection Systems. The filters typically provide filtration to 150 microns, with a set backflush once an hour.
Enpure announce framework with Bristol Water Process engineering company Enpure has been awarded the AMP5 capital projects process framework with Bristol Water. The first of the contracts under the £10M agreement is for the design and construction of UV tertiary treatment plants at Purton, Littleton, Cheddar and Stowey water treatment works.
The works are required to meet associated Drinking Water Inspectorate (DWI) deadlines over a 30 month period. The first being fully operational by December. The DWI has approved UV irradiation as a means of rendering cryptosporidium oocysts non-viable. In addition, at two of the sites, the UV systems will be capable of achieving primary disinfection as well as cryptosporidium removal.
Joint venture secures £200m wastewater scheme
A £200M upgrade and extension to Liverpool wastewater treatment works will be undertaken by a joint venture between Galliford Try, Costain Group and Atkins. The scheme will be progressed as part of the existing process alliance framework. Work involves extending the treatment works in Vauxhall into the dock, along with upgrade works to the existing plant.
Environment Agency orders flowmeters
Nivus UK has been selected as a framework supplier to the Environment Agency. The framework is for the supply of the Nivus OCM Pro and PCM4 flowmeters for small river use. The framework runs until July 2014.
Thames mobilises workforce management Thames Water, has selected ClickSoftware’s Service Optimization Suite help improve the way it manages its workforce, assets and the quality of service customers experience, through optimised scheduling of its field force and contractors.
8 Water & Wastewater Treatment June 2011 A rig bores the Thames riverbed outside the Houses of Parliament last year
Two rigs have been installed at Chambers Wharf on the River Thames in London to test ground conditions up to 70m beneath the riverbed. The work will continue throughout June and will help engineers on the Thames Tunnel engineers develop the best route and strategy for the capital’s mega- sewer.
The rigs are drilling boreholes to provide core samples, which will be tested to identify the various conditions the tunnelling machine is likely to encounter – which include chalk in the east, mixed gravel in the middle and clay in the west.
Phil Stride, head of the London Tideway Tunnels, said:
“We need
to build up a thorough technical understanding
of the potential
constraints along the proposed route to help us refine our scheme ahead of the second phase of consultation due in autumn 2011. “Eighteen boreholes will be drilled by the two rigs, supplementing the samples from the 200 cores we’ve already taken over the past year. Lab tests will provide us with a detailed understanding of the ground conditions, such as the levels of flint in the chalk, which will inform the design of the tunnel and the four large tunnel boring machines we will need to construct the Thames Tunnel.”
The target date for the submission of the planning application for the Thames Tunnel is 2012. Initial construction is provisionally scheduled to start in 2013 with completion in 2020.
Sewer collapse repairs begin
United Utilities is undertaking emergency sewer repairs following a road collapse in Preston. The incident first happened on 17 May and was caused by the collapse of an 160-year old Victorian clay sewer. Repairs began with a 5m excavation the following day and are expected to last six weeks.
Shaun Robinson, spokesperson for UU said: “This sewer is nearly 5m deep, and one of Preston’s main sewerage pipes. There is no other way of repairing the damage, other than to dig down.”
The sewer’s location under a busy road and crossing other utility
service pipes, has made the repair challenging for contractors KMI Water – a joint venture comprising Kier Construction, J Murphy & Sons and Interserve. Following extraction of the collapsed pipe, 20m of replacement 600mm diameter pipe will be installed.
The cause of the collapse had not been identified as WWT went to press, but is thought to be related to the age and condition of
the
existing pipework. UU said that KMI Water’s work on a £114M combined sewer overflow improvement scheme nearby was unaffected by the emergency works.
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