Flemings WTW

Project: Flemings WTW Client: CMDP (Costain/MWH Delivery Partnership) Location: Dover, Kent

Project Introduction

Coleman Construction & Utilities Limited has received high praise during the completion of a major 60-week civil engineering freshwater sub-contract for Principal Contractor CMDP JV, on behalf of Southern Water in Dover. 

As part of the Thanet Nitrates scheme, Southern Water had identified the need for a Nitrate Removal Plant (Ion Exchange Plant) at Flemings WSW. The objective of the scheme was to enable the resilient supply of wholesome water to the Thanet Area under forecast Nitrate groundwater conditions for the 2030 dry year critical period demand scenario. The raw water nitrate concentration forecast has been based on an AMEC study and confirmed by extrapolation of historical water quality trends. 

The works comprised of a new Ion Exchange Building and was secured off the back of Coleman Construction & Utilities Limited’s previous contract delivery at Martin Gorse, company progression, safety performance, as well as the quality of their workmanship.

Coleman Construction & Utilities Limited’s contracted civil engineering scope comprised bulk excavation, new chambers, pipework, drainage and manholes, extension of a roadway and provision of hardstanding’s, site wide ducting, draw pits and new reinforced concrete structures.

These works were in support of Southern Water’s freshwater directive to reduce Nitrate concentrations to 10mg/l N-NO3 for a total water volume of 61.2MLd, from which 5MLd constitute resilience headroom. The supply and demand scenarios were based on SW Revised draft Water Resources Management Plan 2019 (WRMP2019).

The contract was underpinned throughout by a collaborative approach with CMDP JV and Southern Water, as well as other project stakeholders, providing the basis for proactive communication and highly coordinated activities, resulting in the safe and successful completion of this Freshwater civil engineering project.

Project Deliverables – Civil Engineering Scope

Ion Exchange Building:

Caustic Dosing Area:

Wash Water Area:

Salt Saturator and Waste Buffer Tank Bund:

Waste Pumping Station:

Stand-By Generator Area:

Change Over Kiosk:

Soakaway Manhole:

Static Mixer Chamber:

Pipe Work and Connections:   

Site Wide Ducting and Draw Pits:

Site Wide Roads and Hardstanding’s:

Spoil:

Challenges and Solutions

Several challenges have been met throughout the project by Coleman Construction & Utilities Limited, which are detailed below: 

Benefits

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