Final phase of the Belle Greve Wastewater programme underway

May 1st, 2015 by Guernsey Water

High density poly pipes coming out of the factory

High density polyethylene pipes coming out of the Pipelife Norway AS factory in Stathelle (click image to expand)

As part of the final phase of Guernsey Water’s upgrade of the island’s wastewater facilities, over two and a half miles of pipe in nine sections are making their journey from Norway,

Pipelife Norway AS manufactured the purpose-built, high density polyethylene pipes in Stathelle on a fjord, where the pipes are stored temporarily in preparation for their seven-day journey to the island.

Mark Walker, Capital Delivery Manager at Guernsey Water, said “the pipes will arrive in Guernsey in early May and will, subject to formal agreement, be temporarily moored at Soldiers’ Bay, where they will be fitted with concrete collars in preparation for being placed on the seabed via a controlled sinking operation.”

“This work is the final phase of a long-term project Guernsey Water is undertaking to provide the most effective wastewater disposal solution for the island.”

Guernsey’s current long sea outfall, which extends more than a mile from Belle Greve into the Little Russel, is more than 45 years old.

The short sea outfall, which extends about 400 metres to just beyond the low water tide mark, is more than a century old.

A survey conducted in 2011 showed that both pipes were in a state of significant disrepair.

A further study, conducted by global marine experts Intertek Metoc (now Intertek), provided a detailed model for the pipes’ replacement that would ensure optimum results and protect the island’s bathing waters.

The high density polyethylene pipes stored in the Fjord at Stathelle, Norway before their journey to Guernsey (click image to expand)

The high density polyethylene pipes to be used as Guernsey sewage outfall pipes in Belle Greve Bay are stored temporarily in the fjord at Stathelle, Norway before their journey to Guernsey (click image to expand)

“The new outfalls will discharge wastewater in optimum dispersion zones.”

“A combination of the Little Russel’s unique tidal range and the preliminary sewage treatment undertaken at the Belle Greve Wastewater Centre, built during an earlier phase of the project, make this the most appropriate and most sustainable solution.”

“We have also built a four million litre storm storage tank, which will minimise the volume and frequency of excess flow through the short sea outfall during heavy rainfall,” Mr Walker said.

The project will include onshore work to install the new pipes from Belle Greve Wastewater Centre across Les Banques coast road, where a new chamber will be built adjacent to the slipway.

“The project is set to be completed by the end of October 2015 and while we hope that residents and islanders understand the inevitable disruption the works will involve, we also hope they recognise the efforts we have gone to in order to minimise the impact.”

Replacement of the outfalls is absolutely vital for Guernsey and, along with the other phases of our liquid waste strategy, will ensure that the island meets the requirements of water quality legislation now and in the future,” Mr Walker said.

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