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:

• The Ion Building was constructed in 3 sections.
• Excavation for the Ion Building and MCC was 30m x 20m at a depth of 1.5m. The MCC at the end of the building was a depth of 2m which was stepped and battered.
• The MCC cable trough has 1.3 tonnes rebar and is constructed in 2 parts; base and walls; and has 82 ducts.
• The ducting was then laid in 2 layers, each layer was surrounded with C28 concrete.
• The Ion base was then constructed; the steel work and shuttering was put in place and the base was poured in 2 sections, the base contains 10 tonnes of steel.
• The block work was then constructed.

Caustic Dosing Area:

• Consists of 3 reinforced concrete bases, 1 spill tank, waste diversion chamber, emergency shower and eye bath with associated pipe work and duct work. 
• Chemical Storage Kiosk reinforced concrete base is 3.4m x 2.8m x 300mm with top and bottom layers of A393 mesh.
• Chemical Dosing Kiosk reinforced concrete base is 11.3m x 4.21m x 300mm with top and bottom layers of A393 mesh.
• Emergency Shower reinforced concrete base is 1.9m x 1.9m x 250mm with top and bottom layers of A393 mesh.
• Waste Diversion Chamber has a 300mm reinforced concrete base and a 1.5m precast ring with concrete surround. 
• Spill tank is a Spel 200 Series Tankstor underground tank (Capacity= 5000 Liters). This was done with temporary works sheet and frame 6.9m x 3.5m x 3.2m, the tank sits on a 150mm concrete slab with 1 layer of A393 mesh and has a 150 mm concrete surround.

Wash Water Area:

• Consists of 1 reinforced concrete base with associated pipe work and duct work.
• Wash Water Booster Kiosk reinforced concrete base is 5.6m x 3.1m x 300mm with top and bottom layers of A393 mesh and associated pipe work.

Salt Saturator and Waste Buffer Tank Bund:

• This area was piled to give ground support for the Tank Bund. The area was excavated to a depth of 1.3m and backfilled with Type 1 road stone for the pile mat, the piles were 6m and 9m deep.
• Once we had cropped the pile tops the area was blinded for the base slab. The shutters and steel work were put in place and the reinforced concrete base is 14.7m x 8.6m x 400mm with a kicker. The concrete base was poured and is sloped to the sump unit. The wall shutters were put in place as there was restricted space because of the Ion Building. Pery shutters were used as they are light weight and can be lifted into place by hand. Once the walls were poured the tank plinths were marked out and the steelwork and shutters were placed.
• Salt Saturator Tank Plinth is octagonal measuring at 4.5m across. 
• Waste Buffer Tank Plinth is octagonal measuring at 11.050m across. 
• The Tank Bund and Salt Saturator Tank Plinth were then painted with Aquron 2000 paint and the Waste Buffer Tank Plinth with Flexcrete Cemprotec E942.

Waste Pumping Station:

• The Pump Station was built in 2 parts. The cover slab was constructed on site next to the Pump Station and has 216Kg of rebar, 4 lifting points, 1 Davit socket and a Techno cover. It is 2.5m square and 350mm thick and has a mass of 4 tonne.
• The Pump Station was a 2.5m square excavation which was done using a 2.5m manhole box.
• Once excavated the first ring was bedded in to the 300mm concrete base by 50mm. When this had cured the second ring was placed on top and surrounded with 150mm of concrete then benched and painted with Sika 62; a chemical resistant paint; then the cover slab was lifted into place.

Stand-By Generator Area:

• Consists of 1 reinforced concrete slab, 1 3-way valve Diversion Chamber and a Fuel Blind Tank with associated pipe work and duct work.
• Generator Base reinforced concrete slab is 4m x 1.9m x 300mm with top and bottom layers of A393 mesh.
• 3-way valve Diversion Chamber has a 300mm reinforced concrete base and a 1.5m precast ring with concrete surround.
• Fuel Blind Tank is a Spel 200 Series Tankstor underground tank (Capacity= 2000 Liters). This was done with temporary works sheet and frame 4m x 3.225m x 3.2m. The tank sits on a 150mm concrete slab with 1 layer of A393 mesh and has a 150 mm concrete surround.

Change Over Kiosk:

• Is a reinforced concrete base slab 6.3m x 3.350m x 250mm with a concrete cable trough in at 1.2m deep, the trough has 250mm reinforced concrete base and walls with associated duct work.

Soakaway Manhole:

• Excavation was done with 2.5m x 2.5m x 2m manhole boxes. The excavation was 4m deep with a concrete base that the first perforated ring was bedded into by 50mm. A hole was formed in the middle; another 3 rings were placed on top and surrounded in Geotextile Membrane which is then surrounded with shingle. The concrete brisket, concrete risers and lid were placed with a concrete surround.

Static Mixer Chamber:

• For this we had a Line Stop installed so that there was a secondary point of isolation.
• The excavation was done with temporary works sheet and frame 7m x 4.9m x 3.1m.
• The reinforced concrete base was installed and then the pipework. The Line Stop was removed and then the walls were concreted and finally the cover slab.
• It was done in this way because the pipeline is the out feed for the site and could not be off-line for long.

Pipe Work and Connections:   

• The Transfer Pipework is in 350mm ductile iron pipe and is in 2 lengths of approximately 200m each and has wash out chambers on each line at the lowest point.
• The connection was done under SCO. We removed a chamber and a section of pipework and replaced it with a diversion connection to the Ion Building.

Site Wide Ducting and Draw Pits:

• On site there are 13 Draw pits: 3 at 1.5m, 10 at 1.2m 
• 10 lighting columns at 0.8m x 0.8m x 0.8m 
• 6 CCTV Bases 1m x 1m x 1m 
• 1750m of 150mm duct; not including the Ion Building

Site Wide Roads and Hardstanding’s:

• There approximately 630m².
• Site Roads consist of 13 Road Bays of which 2 Bays are bunded areas with 3 road humps.
• The entrance to Site Road Bay 13 was an extra on top. 

Spoil:

• We kept as much of the spoil on site as we could for back fill and subsoil.
• A lot of the excavated spoil was shingle based and was taken for recycling; as little as possible was sent to landfill.

Challenges and Solutions

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

• Excavation for changeover kiosk was done in restricted area because of site main feed cable in the excavation; and the base was fitted between an existing sampling kiosk and main feed cable.
• Deep excavations were solved with a 2-part manhole box system of temporary works design and installation.
• Pipes and manholes within the temporary works were designed and installed using two systems of manhole boxes and trench boxes.
• Deliveries were part of a co-ordinated plan of plant and equipment logistics to ensure works kept on track.
• Interface with other contractors/stakeholders included collaborative early engagement meetings, regular planning, and liaison through weekly project meetings.

Benefits

• Coleman Construction & Utilities Limited provided a non-confrontational approach to commercial and contractual matters, preferring to work collaboratively in the interests of the project. As a result, working relationships with the client at all levels and across all disciplines are at an all-time high.
• Collaborative working has become a daily norm for Coleman Construction & Utilities staff. We always offer a solution-based approach.
• We are always striving for best practice working especially where health, safety and wellbeing are concerned – we aim for zero harm every day.
• We take pride in our work and aim to leave our sites snag free. Our attention to detail is second to none.

Project Introduction

Coleman Construction & Utilities Limited has completed a civil engineering sub-contract for Principal Contractor CMDP JV, on behalf of Southern Water. The works encompassed a new WTW Ferric Dosing package, which comprised of demolishing existing bases, bulk excavation for pile mat, pinpointing all services so we could coordinate trades and ensure that the piles would not interfere with existing services, a new interceptor chamber, pipework and drainage, extension of a roadway and provision of hardstanding’s, site wide ducting, draw pits and new reinforced concrete structures, including a new chemical dosing bund with 500mm base. The walls where formed by using a Peri duo lightweight system which is easily handled, there was also kiosk bases and a shower base plus a road bunded area and road widening.

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 wastewater civil engineering project – meeting time and budget requirements.

Project Deliverables – Civil Engineering Scope

Chemical bunded tank with integral plinths works:

• A 16m x 6m x 1m deep stepped excavation to accommodate the pile mat and avoid temporary works whilst finding the services.
• 6.5 tonnes of rebar were fixed into position to reinforce the 350mm deep concrete base.
• 38m3 of concrete was poured for the base using a 24m concrete pump and then finished by hand.
• Construction of reinforced concrete walls using ‘Peri’ duo formwork.
• Plinths were cast in the bund for the storage tanks and pipe work.

Interception chamber works:

• 3m deep excavation works using a 14-tonne machine.
• Temporary works installation, using a manhole box.
• 1.2m diameter concrete rings lifted in position using a 14-tonne machine to create a 3m deep chamber.
• Groundwater management.

Tertiary area works:

• Installation of 70m of 150mm soil pipe.
• 2No cable draw pits installed.
• 165m of connecting ductwork.
• Concrete bases constructed for caustic dosing kiosk, fibre node box, shower base and tank filling cabinet.

Chemical road bund and road widening:

• A chemical road bund was formed for the containment of any future spills.

Challenges and Solutions

• The biggest challenge was a problematic pressurised wash water main that was very old and fragile. After repairing it several times, due to it failing somewhere else, it was decided to replace and re-route it.
• Congested areas of works within all new pipes, manholes, ducts, draw pits and chambers joining together, were managed through regular programme and sequencing reviews to enable all works to be carefully planned. 
• Deliveries were part of a co-ordinated plan of plant and equipment logistics to ensure works kept on track.
• Interface with other contractors/stakeholders included collaborative early engagement meetings, regular planning, and liaison through weekly project meetings.

Benefits

• Coleman Construction & Utilities Limited provide a non-confrontational approach to commercial and contractual matters, preferring to work collaboratively in the interests of the project. As a result, working relationships with the client at all levels and across all disciplines are at an all-time high.
• Collaborative working has become a daily norm for Coleman Construction & Utilities staff. We always offer a solution-based approach.
• We are always striving for best practice working especially where health, safety and wellbeing are concerned – we aim for zero harm every day.
• We take pride in our work and aim to leave our sites snag free. Our attention to detail is second to none.

Project Introduction

Coleman Construction & Utilities Limited has received high praise during the completion of its civil engineering sub-contract for Principal Contractor CMDP JV, on behalf of Southern Water. The works encompassed a new WTW Ferric Dosing package and was secured off the back of Coleman Construction & Utilities Limited’s (CC&UL) previous contract delivery, 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, including a new LV kiosk base. The total amount of concrete poured was 673m3, including a single pour of 128m3, the largest to date on any CMDP JV project.

These works were in support of Southern Water’s wastewater directive to reduce the phosphorous from 1.0mg/l to 0.08mg/l in line with the new permit (Driven by Habitats 1 and No Deterioration 2).

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 wastewater civil engineering project – meeting time and budget requirements.

Project Deliverables – Civil Engineering Scope

Storm tank extension works:

• A 25m x 25m x 4m deep stepped excavation was undertaken to cleverly avoid the need for any temporary works.
• 34 tonnes of rebar were fixed into position to reinforce the 350mm deep concrete base.
• 128m3 of concrete was poured for the base using a 42m concrete pump and then finished by hand – largest single pour to date (for CMDP JV and CC&UL).
• Construction of reinforced concrete walls using ‘Peri’ formwork.

Pump station construction works:

• 7m deep excavation works using a 35-tonne machine.
• Temporary works installation, using a sheet and frame method (receiving high praise from supplier Groundforce Shorco for one of the best installations they had seen).
• 4m diameter (6 tonne) concrete rings lifted in position using a 35-tonne machine to create a 6m deep chamber.
• Groundwater management.

Tertiary area works:

• Installation of 150m of 500mm ductile iron pipework.
• 15No cable draw pits installed.
• 8000m of connecting ductwork.
• Concrete bases constructed for backwash and vessels.

Spoil:

• All excavated spoil was kept on site.
• 4000m3 was bunded and then later made into an Ecological Enhancement.

Challenges and Solutions

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

• Deep excavations were solved with a 2-part manhole box system of temporary works design and installation.
• Problematic groundwater issues due to water levels, were managed through continuous pumping from the excavation away from the area.
• Pipes and manholes within the temporary works were designed and installed using two systems of manhole boxes and trench boxes.
• Congested areas of works within all new pipes, manholes, ducts, draw pits and chambers joining together, were managed through regular programme and sequencing reviews to enable all works to be carefully planned. 
• Deliveries were part of a co-ordinated plan of plant and equipment logistics to ensure works kept on track.
• Interface with other contractors/stakeholders included collaborative early engagement meetings, regular planning, and liaison through weekly project meetings.

Benefits

• Coleman Construction & Utilities Limited provide a non-confrontational approach to commercial and contractual matters, preferring to work collaboratively in the interests of the project. As a result, working relationships with the client at all levels and across all disciplines are at an all-time high.
• Collaborative working has become a daily norm for Coleman Construction & Utilities staff. We always offer a solution-based approach.
• We are always striving for best practice working especially where health, safety and wellbeing are concerned – we aim for zero harm every day.
• We take pride in our work and aim to leave our sites snag free. Our attention to detail is second to none.

Project Introduction

Coleman Construction and Utilities Limited has delivered a wastewater treatment civil engineering project covering the provision of a new ferric dosing area, de-sludging system, lamellas, and a new pumping station on behalf of client CMDP – a Principal Contractor delivery partnership between Costain and MWH. 

Coleman Construction and Utilities contracted civil engineering project scope comprised bulk excavation, new chambers, pipework, drainage and manholes, formation of new roadways and paths, site wide ducting, draw pits and new bases. 

The overall project aim is to reduce the phosphorous from no permit to 0.5MG/L and the FE to 4MG/L identified in the water industry national environmental programme (WINEP3) and required by 22/12/2024 on behalf of Southern Water – the private utility company responsible for the public wastewater system in Hampshire, the Isle of Wight, West Sussex, East Sussex and Kent. 

Project Deliverables

• Site establishment works 
  • Including groundworks, foundations and ductwork 
  • Provision of temporary footpaths utilising reusable plastic gridded matting and its removal on completion
• Pipe and manhole systems
  • Reinforced concrete bases poured, and precast concrete manhole rings installed
  • Manhole surround shutters installed, and concrete poured to gain a watertight seal
  • Core drilling of pipe penetrations
  • Pipe runs excavated and installed using two types of temporary works: (1) sheet and frame in congested areas; and (2) trench boxes in areas of no obstruction
  • Pipework installed as per manufactures guidelines, air tested for drain runs and pressure tested for pumping mains
• Ferric and Alkalinity area including lamellas (ferric dosing unit to dose ferric sulphate to the treatment works and remove phosphates from the treatment process) (Lamella Inclined Plate Clarifiers for Wastewater The Graver Lamella design utilises inclined plate clarification to separate solids from the water and clarify the water. The lamella is composed of a series of removable parallel plates commonly referred to as “lamella plates”.)
  • Excavate and lower depth of entire footprint
  • Installation of all required electrical and dosing line ducts
  • Installation of ‘Cubis’ rapid stack draw pits
  • Installation of pipe work for drainage, including capturing any spill of ferric during delivery
  • Install 1No 1500mm diameter manhole (intercept chamber) to hold large spill of ferric when delivery is taking place
  • Cast a reinforced concrete slab to house ferric dosing unit, which was constructed on compacted type 1 and concrete blinding
  • Concrete access roads formed and poured with containment humps in case of ferric spillage
  • Installation of pipework for delivering water to the treatment plant from the pump station and then on to FE chamber for sampling before leaving site
  • Surface water drainage manholes and pipework
• New PST air lift de sludge 
  • Electrical ducting installed with cast in swept ducts
  • Cast a reinforced concrete slab to house the de sludge kiosk
• New Intermediate pumping station 
  • Excavate a 4meter deep hole 
  • Install the temporary works system 
  • Cast in slab at the bottom 
  • Start building up sections 
  • Cast in pipework to the pumping station 
  • Slab around the top including footpaths, upstand

Challenges and Solutions

Several challenges have been met and solved throughout the project by Coleman Construction & Utilities Limited. In doing so, the team delivered the project on time and within its budget: 

• Deep excavations for the ferric interceptor chamber and chemical dosing interception chamber were solved with an alternative sheet and frame temporary works design and installation
• Pipes and manholes within the temporary works were installed using two systems of manhole boxes and trench boxes
• There were congested areas of where all new pipes, manholes, ducts, draw pits and chambers joined together. Coleman Construction & Utilities Limited undertook regular programme and sequencing reviews, which enabled all works to be planned in advance  Plant deliveries required a co-ordinated plan of plant and equipment deliveries to ensure works kept on track
• Interface with other contractors/stakeholders was required throughout. The Coleman team engaged in collaborative early meetings, regular planning and coordination through weekly project meetings
• Unmarked services where located, were dealt with expediently and then marked onto as-built drawings to support as-built records and the health and safety file

Benefits

• Coleman Construction & Utilities Limited provided a non-confrontational approach to commercial and contractual matters, preferring to work collaboratively in the interests of the project. As a result, working relationships with the client at all levels and across all disciplines were and remain at an all-time high.
• Collaborative working has become the daily norm for Coleman Construction & Utilities staff. The team always endeavour to offer a solution-based approach.
• The team were always striving for best practice working especially where health, safety and wellbeing are concerned. The team aim for zero harm every day.

The company takes pride in its project work, leaving sites snag free. Our attention to detail is second to none.

Project Introduction

Coleman Construction and Utilities Limited’s contracted civil engineering project scope comprised bulk excavation, new chambers, pipework, drainage and manholes, formation of new roadways and paths, site wide ducting, draw pits and new bases. 

The overall project scope will deliver deep bed tertiary treatment and provision of clean and dirty backwash tanks and includes a new pump station, new mcc panel, new P&FE and a new ferric/alkalinity dosing unit. These works were in support of Southern Water’s directive to reduce the phosphorous from no permit to 0.5MG/L and the FE to 4MG/L identified in the water industry national environmental programme (WINEP3) and required by 22/12/2024. 

Project Deliverables

• Site establishment works 
  • Including groundworks, foundations and ductwork 
  • Provision of temporary footpaths utilising reusable plastic gridded matting and its removal on completion
• Pipe and manhole systems
  • Reinforced concrete bases poured, and precast concrete manhole rings installed
  • Manhole surround shutters installed, and concrete poured to gain a watertight seal
  • Core drilling of pipe penetrations
  • Pipe runs excavated and installed using two types of temporary works: (1) sheet and frame in congested areas; and (2) trench boxes in areas of no obstruction
  • Pipework installed as per manufactures guidelines, air tested for drain runs and pressure tested for pumping mains
• Ferric and Alkalinity (ferric dosing unit to dose ferric sulphate to the treatment works and remove phosphates from the treatment process)
  • Excavate and lower depth of entire footprint
  • Installation of all required electrical and dosing line ducts
  • Installation of ‘Cubis’ rapid stack draw pits
  • Installation of pipe work for drainage, including capturing any spill of ferric during delivery
  • Install 1No 1500mm diameter manhole (intercept chamber) to hold large spill of ferric when delivery is taking place
  • Cast a reinforced concrete slab to house ferric dosing unit, which was constructed on compacted type 1 and concrete blinding
  • Concrete access roads formed and poured with containment humps in case of ferric spillage
  • Installation of pipework for delivering water to the treatment plant from the pump station and then on to FE chamber for sampling before leaving site
  • Surface water drainage manholes and pipework

Challenges and Solutions

A number of challenges have been met and solved throughout the project by Coleman Construction & Utilities Limited. In doing so, the team delivered the project on time and within its budget: 

• Deep excavations for the ferric interceptor chamber and chemical dosing interception chamber were solved with an alternative sheet and frame temporary works design and installation
• Pipes and manholes within the temporary works were installed using two systems of manhole boxes and trench boxes
• There were congested areas of where all new pipes, manholes, ducts, draw pits and chambers joined together. Coleman Construction & Utilities Limited undertook regular programme and sequencing reviews, which enabled all works to be planned in advance 
• Plant deliveries required a co-ordinated plan of plant and equipment deliveries to ensure works kept on track
• Interface with other contractors/stakeholders was required throughout. The Coleman team engaged in collaborative early meetings, regular planning and coordination through weekly project meetings
• Unmarked services where located, were dealt with expediently and then marked onto as-built drawings to support as-built records and the health and safety file

Benefits

• Coleman Construction & Utilities Limited provided a non-confrontational approach to commercial and contractual matters, preferring to work collaboratively in the interests of the project. As a result, working relationships with the client at all levels and across all disciplines were and remain at an all-time high.
• Collaborative working has become the daily norm for Coleman Construction & Utilities staff. The team always endeavour to offer a solution-based approach.
• The team were always striving for best practice working especially where health, safety and wellbeing are concerned. The team aim for zero harm every day.
• The company takes pride in its project work, leaving sites snag free. Our attention to detail is second to none.

Testimonial

“Kilndown WTW is a very small site with lots of existing equipment and also buried services and structures. This proved to be a challenge throughout the Civils Phase of works especially during excavation works.

“Coleman worked collaboratively with us (CMDP) to resolve issues with existing buried structures and offered and suggested solutions.

“A total of 126 safe working days were achieved at Kilndown without a single incident which speaks volumes as to the safe working practices which are being upheld by Coleman.

“The level of concrete finishing and quality of work was to a very high standard with comments being made from the client (Southern Water) on several occasions during their visits to site.

“The Civils package was delivered by Colemans on time, within budget and in a professional and safe manner.

“I would like to take this opportunity to thank Billy Rixon and the workforce and look forward to working with them in the future.”

Adam Morris
Senior Site Manager, CMDP JV

Project Introduction

The awarded civil engineering sub-contract by Principal Contractor CMDP, was the first of two large wastewater civil engineering schemes in Kent secured off the back of Coleman Construction & Utilities Limited’s progression and 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, formation of new roadways and paths, site wide ducting, draw pits and new bases. These works were in support of Southern Water’s wastewater directive to reduce the phosphorous from 1.0mg/l to 0.08mg/l in line with the new permit (Driven by Habitats 1 and No Deterioration 2) .

The contract was underpinned by a collaborative approach with CMDP 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 wastewater civil engineering project – meeting time and budget requirements.

Project Deliverables

• Provide a Ferric dosing package system including a 10 m3 integral bunded storage tank with level sensors, complete with 3no ferric dosing pumps duty/duty/standby serving two points of application (POA1 and POA2). POA1 is into the inlet channel chamber downstream of the flume where the filter recirculation is returned. POA2 is into the static mixer of new rising main of tertiary feed pumping station upstream of new tertiary treatment (direct dosing)
• Alkalinity dosing (Sodium Hydroxide, 27% w/w Solution) package plant to be provided including 2no dosing pumps, duty/standby, and a 10 m3 Sodium Hydroxide Storage Tank. The point of application for the alkalinity dosing is into the secondary filter syphon chamber
• Provide new intermediate pH monitor in the humus tank distribution chamber
• Provide a designated combined delivery area for Ferric Sulphate and Sodium Hydroxide. Both chemicals to be housed completely separately but delivery for both will be on the same bunded apron area utilising a common interceptor chamber and safety shower
• Provide new potable water pipework connected to the existing site supply for emergency shower/eyebaths
• Provide new ortho-phosphate, iron and pH monitors along with sample feed pump in the existing Final Effluent Sample chamber
• Provide walk in sampling kiosk with heater along with Reinforced Concrete (RC) slab of sufficient size to accommodate kiosk
• Provide new tertiary feed pumping station with 2 No. VSD duty/standby pumps rated at 35l/s flow (FFT plus works returns) complete with high level overflow to the final effluent chamber and a flow meter which will also be used for controlling the ferric dose rate
• Provide a new secondary POA ferric mixing via static mixer directly into tertiary treatment feed rising main
• Provide 3 No. FilterClear tertiary treatment (TT) units of 2.04 m diameter (3V2040 tbc) to treat flows including works return complete with a clean water tank and a dirty backwash tank. Each tank shall be sized for 2 backwash volumes (43m3 each tbc)
• Provide flow control actuated valve in the dirty backwash tank to control effluent rate into new works return pumping station
• Provide new works return pumping station with duty/standby pumps rated at 10l/s. It shall receive flows from the interception chamber (dosing systems), dirty backwash returns from new dirty backwash tank, humus sludge, decant from sludge holding tanks and site drainage. The pumping station shall discharge to the existing balancing tank
• Provide a new filter recirculation pump in the existing recirculation sump, 1No. VSD duty pump rated at 12.6 l/s, with a new flow meter in the rising main for flow control
• Provide a new modulating Penstock in the outlet of the existing balancing tank and a new flume downstream of the existing screens to control the flow rate to the works
• Provide new sludge transfer pumping station with 2 No. duty/standby progressive cavity pumps to transfer primary sludge from primary settlement tanks airlift system to the existing sludge holding tanks
• Remove humus tank wedge wire
• The existing reed beds to be made redundant
• Provide footpaths and bollards where necessary
• Supply and install road signage to direct the tanker driver to the dosing plant
• Provide RC slab of sufficient size to accommodate package unit
• Provide pipework and connection to existing line to final effluent chamber

Challenges and Solutions

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

• Deep excavations were solved with a 2-part manhole box system of temporary works design and installation
• Pipes and manholes within the temporary works were installed using two systems of manhole boxes and trench boxes
• Congested areas of works within all new pipes, manholes, ducts, draw pits and chambers joining together – the team at Coleman undertook regular programme and sequencing reviews to enable all works to be carefully planned 
• Deliveries were part of a co-ordinated plan of plant and equipment logistics to ensure works kept on track
• Interface with other contractors/stakeholders included collaborative early engagement meetings, regular planning, and liaison through weekly project meetings

Benefits

We provide a non-confrontational approach to commercial and contractual matters, preferring to work collaboratively in the interests of the project. As a result, working relationships with the client at all levels and across all disciplines are at an all-time high.

Collaborative working has become a daily norm for Coleman Construction & Utilities staff. We always offer a solution-based approach.

We are always striving for best practice working especially where health, safety and wellbeing are concerned – we aim for zero harm every day.

We take pride in our work and aim to leave our sites snag free. Our attention to detail is second to none.

Testimonial

“Thanks to the team at Coleman Construction & Utilities for delivering a first class civil engineering project at Ticehurst. Throughout, they provided a collaborative approach to all matters, working in the interests of the project, with a high attention to detail.”  

James Irvine – CMDP JV

Project Introduction

This wastewater civil engineering contract on behalf of Southern Water, was awarded to Coleman Construction & Utilities Limited following competitive tender. It comes off the back of the company’s superb track record of delivery and performance for CMDP over a number of years, with regards to Health and Safety also the quality of their workmanship.

This contract is underpinned by a firm, collaborative ethos, with both client (PC – CMDP) and civil engineering sub-contractor (Coleman Construction & Utilities), working together to achieve high standards in amongst some complex civil engineering challenges and stakeholder integration.

The purpose of the project is to improve the quality of final effluent being discharged from the works and entering the local water course’s and to meet the regulatory output dates set by the Environment Agency.

This is largest individual civils project completed by the company to date. It has been fully managed by Coleman Construction & Utilities Limited site management team and has had up-to 15 full-time personnel delivering the works.

Project Deliverables

• Tertiary treatment pump station
  • Excavate and install sheet and frame temporary works
  • Concrete blinding for base steel and shutter installs
  • Installation of cut and bent steelwork with timber shutters
  • Pour concrete to base
  • Installing cut and bent steel work and bespoke shuttering for walls including temporary design works
  • Internal walls to be installed with steel work and shuttering prior to concrete pouring
  • Benching to be installed to design
  • Backfilling to be done in stages
• Stage 1 up to underside of incoming 900mm main
• Stage 2 up to surrounding area slabs including temporary works removal
• Final effluent monitoring chamber
  • Excavation to be completed as a stepped excavation
  • Concrete blinding for base steel and shutter installs
  • Installation of cut and bent steelwork with timber shutters
  • Pour concrete to base
  • Installing cut and bent steel work and bespoke shuttering for walls including temporary design works
  • Pipe work with diameters of 600 and 800mm in ductile iron to be installed to associated manhole
• Pipe and manhole systems
  • Manholes excavated and installed within temporary works boxes
  • Bases poured with concrete and manhole rings installed
  • Manhole surround shutters installed, and concrete poured to gain watertight seal
  • Pipe penetrations core drilled
  • Pipe runs excavated and installed using two temporary works systems (1) sheets and frames will be used in congested areas; (2) trench boxes will be used when there are no obstructions
  • Pipe work to be installed as per manufactures guidelines and air tested for drain runs plus pressure tested for pumping mains
• Ferric dosing unit to dose ferric sulphate to the treatment works to this will remove phosphates from the treatment process
  • Reduce dig footprint of the area for work
  • Installation of all required electrical and dosing line ducts
  • Installation of Cubis rapid stack draw pits
  • Installation of pipe work for drainage and capturing of any spill of ferric during delivery
  • 1500mm diameter manhole (intercept chamber) to hold large spill of ferric when delivery is taking place
  • Concrete slab to house ferric dosing unit to be constructed on compacted type 1 and concrete blinding
  • Concrete access roads to be poured with containment humps in case of ferric spillage
• Actiflo filter system (a 3-stage tertiary treatment plant and will be the first of its kind for Southern Water on a wastewater scheme)
  • Reduce dig the footprint of the area
  • Installation of all required electrical ducts
  • Installation of Cubis rapid stack draw pits
  • Installation of pipe work for delivering water to the treatment plant from the pump station and then on to FE chamber for sampling before leaving site and entering the local water course
  • Drainage manholes and pipe work installed to take surface water and drain off from filter clean outs

Challenges and Solutions

A number of challenges have been met throughout the project by Coleman Construction & Utilities Limited, which have been solved, allowing the project to stay on time and within budget:

• Deep excavations – solved with sheet and frame temporary works designs for both the pump station and final effluent chamber.
• Pipes and manholes within the temporary works installed using two systems of manhole boxes and trench boxes.
• Congested areas of works within all new pipes, manholes, ducts, draw pits and chambers joining together – Coleman undertook regular programme and sequencing reviews to enable all works to be planned in advance
• Plant deliveries – a co-ordinated plan of plant and equipment deliveries to ensure works kept on track
• Interface with other contractors/stakeholders – collaborative early engagement meetings, regular planning and liaison through weekly project meetings

Benefits

• Coleman Construction & Utilities worked with the client, not against them. We developed better working relationships with client site teams, through collaborative working and a solution-based approach.
• We strived for best practice working especially where health, safety and wellbeing are concerned – aiming for zero harm.
• We took pride in our work leaving our sites snag free. Our attention to detail was second to none.

Testimonial

“As CMDP Works superintendent I have worked very closely with Coleman Construction & Utilities Limited for over 10 years. It has been a great journey with a very wide variety of civil engineering challenges, as well as very high standards of health and safety and quality.

“Coleman Construction & Utilities have embraced everything we promote and stand for at CMDP – even going above and beyond in some cases.

“I personally have the pleasure of working very closely with the front line supervisors and have a great deal of respect for them.”

Chris Hallam
Works Superintendent
CMDP

Project Introduction

Coleman Construction & Utilities Limited’s contracted civil engineering project scope comprised bulk excavation, new chambers, pipework, drainage and manholes, formation of new roadways and paths, site wide ducting, draw pits and new bases. These works were in support of Southern Water’s wastewater directive to reduce the phosphorous from 1.0mg/l to 0.08mg/l in line with the new permit (Driven by Habitats 1 and No Deterioration 2) by 21/12/2021.

The awarded sub-contract by Principal Contractor CMDP, was the first of 2 large wastewater civil engineering schemes in Hailsham secured off the back of Coleman Construction & Utilities progression and safety performance, as well as the quality of their workmanship.

The contract was underpinned by a collaborative approach between CMDP and Coleman Construction & Utilities Limited, which provided a basis for proactive communication and highly coordinated activities, resulting in the safe and successful completion of a complex wastewater civil engineering project on time and to budget.

Project Deliverables

• Site establishment works
  • Including groundworks, foundations and ductwork.
  • Provision of temporary footpaths utilising reusable plastic gridded matting, which was then easily removed on completion
• Pipe and manhole systems
  • Bases poured with concrete and manhole rings installed
  • Manhole surround shutters installed, and concrete poured to gain a watertight seal
  • Core drilling of pipe penetrations
  • Pipe runs excavated and installed using 2 types of temporary works: (1) sheets and frames were used in congested areas; and (2) trench boxes were used in areas of no obstruction
  • Pipe work installed as per manufactures guidelines and air tested for drain runs, plus pressure tested for pumping mains
• Ferric and Alkalinity – Ferric dosing unit to dose ferric sulphate to the treatment works and remove phosphates from the treatment process
  • Reduce dig footprint of the area for work
  • Installation of all required electrical and dosing line ducts
  • Installation of Cubis rapid stack draw pits
  • Installation of pipe work for drainage and capturing of any spill of ferric during delivery
  • 1500mm diameter manhole (intercept chamber) to hold large spill of ferric when delivery is taking place
  • Concrete slab to house ferric dosing unit constructed on compacted type 1 and concrete blinding
  • Concrete access roads poured with containment humps in case of ferric spillage
• Actiflo filter system (a 3-stage tertiary treatment plant and will be the first of its kind for Southern Water for a wastewater scheme)
  • Reduce dig footprint of the area for work
  • Installation of all required electrical ducts
  • Installation of Cubis rapid stack draw pits
  • Installation of pipework for delivering water to the treatment plant from the pump station and then on to FE chamber for sampling before leaving site entering the local water course
  • Drainage manholes and pipe work installed to take surface water and drain off from filter clean outs

Challenges and Solutions

A number of challenges have been met throughout the project by Coleman Construction & Utilities Limited, which allowed the project to stay on time and within budget:

• Deep excavations for the ferric interceptor chamber and chemical dosing interception chamber – solved with sheet and frame temporary works design and installations
• Pipes and manholes within the temporary works installed using two systems of manhole boxes and trench boxes
• Congested areas of works within all new pipes, manholes, ducts, draw pits and chambers joining together – Coleman undertook regular programme and sequencing reviews to enable all works to be planned in advance
• Plant deliveries – a co-ordinated plan of plant and equipment deliveries to ensure works kept on track
• Interface with other contractors/stakeholders – collaborative early engagement meetings, regular planning and liaison through weekly project meetings

Benefits

• Coleman Construction & Utilities Limited provided a non-confrontational approach to commercial and contractual matters, preferring to work collaboratively in the interests of the project. As a result, working relationships with the client at all levels and across all disciplines are at an all-time high.
• Collaborative working became a daily norm for Coleman Construction & Utilities staff. We always offered a solution-based approach.
• We always strived for best practice working especially where health, safety and wellbeing are concerned – aiming for zero harm every day.
• We took pride in our work, aiming to leave our sites snag free. Our attention to detail was second to none.