NI Water Capital Delivery Framework IF019 LOT 4 Small Sewers and Minor Works

Under this contract we acted as the Principal Contractor and were required to engage with the Design Team and NI Water to develop a delivery plan and schedule to allow for the works to be completed within time and budget. To confirm our approach to delivery we developed, agreed, and implemented a Construction Phase Plan which enabled us to plan, monitor, and co-ordinate all stages of the project. We ensured that the staff selected to work on the project had the necessary skills and competencies to deliver the work to the highest standards and we provided the client with evidence of this in the form of a Training Matrix which confirmed the staff’s names, and their individual qualifications and training that prequalified them to undertake the work. We engaged with sub-contractors and applied our Subcontractor prequalification processes to select the sub-contractor that could evidence their experience, capacity, and financial security. Our Health and Safety Team engaged with all staff who would be required to carry out the work and provided them with risk assessments, method statements, safe systems of work and site rules which were used to ensure that all staff had an awareness of the potential risks and the contingency measures that we would implement to manage and control the risks identified. In the delivery of this project, we also undertook environmental assessments to identify how any risks to the environment could be minimised and to ensure that all staff were aware of any potential environmental risks and the confirmed mitigations which had been implemented to reduce the likelihood of issues arising and to ensure the protection of local ecosystems. We developed waste management plans and confirmed all environmental plans with the client. indicators set by NI Water.
An example of a project on this framework was Strabane Academy, Storm Sewer Requisition. Conwell Contracts Ltd were appointed Principal Contractor for the construction and commissioning of 444m of new 300mm UPVC storm sewer mostly installed by open cut 37m of horizontal directional drilling across the A5 Barnhill Road. Directional drilling was used to avoid traffic disruption to a busy transport link adjacent to Strabane Academy. The new sewer included the construction of 11No 1200mm manhole chambers and a new outlet headwall at the river. Road reinstatement of open cut trench & launch/Receive pits for the HDD in accordance with the NIRAUC specification.

This project was carried out under the NEC 3 Engineering and Construction form of contract.

Another scheme on this framework was the construction of a new Wastewater pumping station on Drumcree Road, Portadown. The construction of the Wastewater Pumping Station included a 2700mm diameter wet well, 2100mm valve chamber, 1200mm flow meter chamber, inlet pipework, emergency overflow pipework, foul pump delivery pipework, ducting, site fencing, site drainage and a gabion retaining wall. Given the depth of the pump sump and ground conditions, driven sheet piles had to be installed and pumps used to control groundwater during construction.
Works also included the construction of 617m of 110mm HDPE foul pumping main using HDD, with associated chambers discharging to an existing NI Water foul manhole at the junction of the Drumcree Road and Garvaghy Road. Installation of 78m of 150mm diameter uPVC foul sewer and 20m of 150mm uPVC overflow sewer discharging via a precast concrete headwall to the river Ballynagowan River.

As part of the works, we had to connect a developer’s foul sewer into the new line, dealing with flows from the development to allow the connection to be made.
Air testing and CCTV camera survey of the foul and emergency overflow sewers was carried out.