Uttlesford Bridge is a borehole source water treatment works site. The site abstracts water from two boreholes sunk in the upper and middle chalk, following disinfection the water is pumped into the local distribution network and a nearby storage reservoir facility.
The principle issue which formed the basis of the project design is that the existing 4 no. Force Pumps were at their “end of life” requirement and could not be suitably refurbished or adequately maintained in situ. To remove these pumps would have required extensive work in removing the roof structure which is not appropriate for this site as it must remain in service on a daily basis.
In resolving this issue, the outline design included replacing the existing mismatched borehole pumps, which were rated to discharge into the existing Contact Tank, with matched high-pressure pump which can abstract the full potential of the abstraction licence and deliver directly into supply through a new UV and Marginal Chlorination treatment process.
To counter vulnerabilities in the existing power distribution network, a new Standby Back-up Generator has been installed.
The upgrade works include:
- New vertical spindle borehole pumps, which are mounted above the headplate in a newly constructed, LPCB rated kiosk in line with SEMD requirements.
- Installation of a new UV disinfection system with duty / standby UV irradiation chambers sized to accept the full site flow.
- Installation of a new Sodium Hypochlorite Storage and Dosing System include bulk storage tanks and dosing pump skids with associated pipework and instrumentation arrangements.
- Installation of a new Booster Pumping System to maintain a pressurised supply of final, treated water to the local distribution network.
- Installation of a New MCC Panel and PLC system.
- Installation of a new 600 kVA rated Standby Diesel Generator.
Our scope on the whole project included the following services:
- Full development of detailed electronic format Operations & Maintenance Manuals (O&Ms).
- Completion of CDM Health & Safety File.
- Asset Registration.
- Onsite Installation of Asset Tags.
- Liaison and collaboration with all subcontractors involved on the scheme to co-ordinate the required documentation and drawings and ensure full compliance with the end clients specific standards.
- Providing As-Constructed Asset Photographs.
To complete the above services, our project team visited the site multiple times to collect all required information. Throughout the duration of the project we attended numerous progress / handover meetings including meeting NMCN representatives to discuss technical elements of the documentation.
Throughout the project we worked very closely with NMCN’s project team including design engineers, handover co-ordinators and project manager to ensure all documentation deliverables were submitted on time and to the required high standard expected.
July 2019 – October 2020
NMCN
Affinity Water