A first time waste water treatment works (WwTW) for the village and community of Mountfield in East Sussex will also yield a significant environmental and biodiversity dividend.
Under Southern Water’s AMP6 capital works programme, the £3 million project was awarded to BTU and has been delivered by Barhale as part of the AMP6 joint venture.
The WwTW, together with the recently completed new sewer network for Mountfield, will help to reduce the threat of pollution incidents from the previously-used individual property cess tanks. The works also include measures to increase biodiversity such as creating a grass and wildflower meadow within the site.
Barhale worked in an integrated team with Southern Water to meet the planning conditions which included the twin challenge of the site’s location on a flood plain and the need for the WwTW to observe height restrictions by being built into the ground.
Barhale’s southern region director Phil Cull says that the task was made even more difficult by the extended heavy rainfall as the team went on site.
“Dewatering was a major issue,” he said. “We found ourselves having to pump out and tanker water away several times a day, which had a knock on effect in terms of interruptions to work.
“In the end, we came up with the solution of a nursing tank mounted at the site’s entrance. That way we could keep the site dry and the tanker collections no longer disturbed progress.”
Barhale also enhanced the original plans to mitigate the risk of flooding on site. Previously, a French drain that crossed the site from the access road to the river had been proposed to collect the runoff from the access road.
Phil Cull continued:
“This was only able to collect the runoff from the access road and so only partially addressed the problem, especially during heavy rainfalls.
“We suggested to the client that we installed a French drain to capture all the water coming from the elevated area but then diverted it into a specially constructed soakaway lagoon, from where it would eventually find its way into the river through the ground.”
Barhale constructed the fully operational WwTW from a green field site, to discharging a compliant effluent to the River Line within 10 months.
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