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New mains water pipe for North Mymms

Part of work to remove metaldehyde from water supply


Work being carried out alongside Warrengate Road Image by North Mymms News released under Creative Commons BY-NC-SA 4.0
Work being carried out alongside Warrengate Road
Image by North Mymms News released under Creative Commons BY-NC-SA 4.0
A new pipeline connecting the North Mymms water treatment works to the mains supply is being put in place.

Once connected it will carry water to recently installed equipment at the Warrengate Road site designed to take metaldehyde - a chemical used to kill slugs - out of the North Mymms supply.

Work on the east side of Mimmshall Brook  Image by North Mymms News released under Creative Commons BY-NC-SA 4.0
Work on the east side of Mimmshall Brook
Image by North Mymms News released under Creative Commons BY-NC-SA 4.0

In 2012 the area’s drinking water was deemed to contain “increasing levels” of the chemical by the Drinking Water Inspectorate (DWI). This followed a DWI investigation into the quality of the water supplied by Affinity Water.

In October 2013 the DWI published a report following the examination of the local water supply which found that:
“Four of the proposals are to implement measures to address increasing levels and types of pesticides in the raw waters at Affinity’s major surface water treatment works. Metaldehyde is widely used in agriculture for the control of slugs, and is not removed by existing treatment processes for pesticide removal. 2012 was a very wet year and Affinity Water, like most companies with lowland surface water abstractions, experienced high levels of metaldehyde in raw waters which lead to failures of the standard in water supplied to customers.”
The report continued:
“The proposal for North Mymms includes investigation of treatment options to address metaldehyde. North Mymms treats water from four different groundwater sources that are vulnerable to pollution from various sources. In two of the sources metaldehyde has been detected where its origin is thought to be a local landfill site. In this case catchment actions are unlikely to achieve significant benefits, and the Company is proposing to install powdered activated carbon dosing (PAC) at North Mymms treatment works to assess its ability to reduce levels of metaldehyde to achieve compliance with the standard in the treated water.” 
The DWI report is embedded below.



New buildings and equipment needed


In order to meet the requirements of the DWI, Affinity Water appointed consultants to draw up plans for the redesign of the North Mymms treatment works on Warrengate Road.

Those plans were prepared and presented. Outline planning permission for the demolition of the old buildings was given the green light in December 2015.




Planning permission for the enhancement and installation of additional treatment buildings was granted in October 2018 for the:
“Installation of new plant and machinery to enable new water treatment process at existing treatment plant and all associated works at site of recently demolished plant building to include: Single actiflo Carb 5 unit, Actiflo Carb Recycl Pumps and hydrocyclone, PAC Storage Silo and conveyor system, New plant building, Wastewater recovery plant and New kiosk housing a new motor control centre.”

Demolition of the 1920s buildings


Sketch of the old buildings from the submitted plans

The new buildings in the plans

Sketch of the new buildings from the submitted plans

The laying of the new pipeline


The work currently underway along Warrengate Road is to lay a new pipeline to carry water to the new facilities at the North Mymms treatment works. The contractor is Trant Engineering.

A sign posted at the Warrengate Road / Abdale Lane site says the work is scheduled to last for three months. The sign reads:
“Affinity Water is investing to improve the quality of the water supply in the area where you live. This will enable us to continue providing you and the local community with high quality water you can trust, for many years to come. Affinity Water will be carrying out work to install a new pipe to supply our North Mymms treatment works. ”

A section of new pipe alongside Warrengate Road  Image by North Mymms News released under Creative Commons BY-NC-SA 4.0
A section of new pipe alongside Warrengate Road
Image by North Mymms News released under Creative Commons BY-NC-SA 4.0

Entrance to the field east off Bradmore Lane  Image by North Mymms News released under Creative Commons BY-NC-SA 4.0
Entrance to the field east off Bradmore Lane
Image by North Mymms News released under Creative Commons BY-NC-SA 4.0

The notice on the Affinity Water site states that the work is expected to be completed by 3 June, 2019.

Screen grab of works from the Affinity Water site
Screen grab of works from the Affinity Water site

Ban on the use of metaldehyde


Last month, the Metaldehyde Stewardship Group's attempt to extend the withdrawal period for metaldehyde slug pellet products was refused.

The sale and distribution of metaldehyde slug pellets will end on 30 June 2019 and the disposal, storage and use up of existing stocks will end on 30 June 2020.





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