Shinfield Eastern Relief Road

CEEQUAL Excellent (75%) – Construction Award
 Version 5, September 2019| Shinfield

Assessor: Karen McWalter, HOCHTIEF (UK) Construction
Verifier:  Graham Parry, ACCON
Constructor: HOCHTIEF (UK) Construction

Project Summary

Construction of a new single span overbridge over the M4 with approximately 1.6km of relief road around the village of Shinfield. The relief road passes through a greenfield site, with half the length across an active flood plain and associated reconfigurations to existing roads and junctions. The road across the flood plain was constructed on a clay core embankment to keep the road above the 1 in 100 year + climate change flood levels, with culverts beneath the embankment to mitigate the impact on flood waters.

The project included extensive environmental mitigations including mammal tunnels, bat and bird roosts, reptile hibernacula, animal proof fencing and an extensive landscaping regime.

Challenges

Construction of the road across the active flood plain – careful programme management; use of site won material to reduce overall programme and complete key works within summer months.

Vehicle access to site was via a single road through the village – used site won material and on-site disposal where possible to reduce vehicle movements; limited site access points; prevented access via / along residential streets.

Why did this project use CEEQUAL

The project team recognised that we were naturally following the principles of CEEQUAL with regards to delivering the project. As such, for a small amount of additional effort to collate the evidence required, the team decided to undertake the formal assessment and seek the award.

Which elements of the project highlighted best practice and innovation?

Sourcing the clay core material for the main embankment across the flood plain from on site, with the resulting excavation allowing on-site disposal of unsuitable inert material.

Has CEEQUAL represented value for money?

Yes – the value which the award is likely to bring to the business due to positive recognition from clients is expected to outweigh the cost incurred in securing the award.

CEEQUAL Section Specific Achievements

People and Communities

The project team, and particularly our stakeholder manager, were actively involved with the local community. This included attending and sponsoring local village events and competitions, hosting regular community update meetings and making a special presentation to a local dance school who had been displaced by the project.

The Historic Environment

An existing Listed building was retained by the project, including completing remedial works and construction of a new boundary wall with matching historic materials and methods. This allowed the employment of a local specialist contractor, with improvement to their knowledge and skills.

The Water Environment

The Water Environment All water used on site, with the exception of that which needed to be potable water for health and/or specification reasons, was sourced from site run off, intercepted groundwater from excavations or from EA permitted extraction points in the local river. The project constructed the permanent attenuation ponds as early as possible to provide storage for the water to permit on-site use.

Physical Resources – Use and Management (Energy, Water, Materials, Waste)

During delivery of the project, the existing ground within the site was found to be of suitable quality to allow a local borrow pit to source the main clay core for the road embankment across the flood plain. The borrow pit was backfilled using inert unsuitable materials from the site.

Pile arisings (good quality clay) and other suitable material won from site were used in the construction of the main embankments rather than being disposed of off site.

The project also constructed a temporary haul road across the flood plain directly below the permanent embankment using soil mixing / stabilisation methods with no additional import. This prevented disturbance of the existing ground which would have rendered it unsuitable for use and would have needed it to be removed and replaced.

Between these two items, over 2000 lorry movements were removed from the local roads, along with a reduction in the import / export of materials to site of approximately 18,000 tonnes.