O and H Properties Ltd
Remediation and Land Quality Management
The Western Relief Road at Stanway was designed to enable the construction of a
new housing development on the site of a former sand and gravel extraction site. The site was located approximately 4.3 miles west of Colchester city centre on the edge of Stanway and less than one mile south of the A12. The total site area extended across approximately 60 hectares, bounded by existing housing to the east and the Tollgate shopping centre immediately to the north. Land to the south had recently been developed into residential use (Lakelands Phase 1).
In order to facilitate the Lakelands Phase 2 development, a significant earthworks re-contouring exercise was undertaken involving approximately 500,000 cu.m of material excavation and deposition together with the construction of a 2km
long relief road. The existing Phase 1 development comprised 300 dwellings and Phase 2 comprised a further 500.
BWB Consulting carried out infrastructure design, earthworks design, site supervision and CDM Co-ordinator services on behalf of O&H Properties Ltd.
The significant earthworks movements needed careful monitoring to see that the required compaction in deep fill areas was achieved. The existing alignment of Church Lane, which crossed the route of the relief road, needed to be formally Stopped Up and a new bridge provided over the relief road for a re-aligned Church Lane.
BWB provided engineering support throughout the duration of the works to see that the earthworks and highway works were carried out in accordance with appropriate standards and were carried out safely. The earthworks were designed to achieve a cut/fill balance in order to minimise the requirement for import/export of materials. Existing materials were re-used wherever possible by crushing, screening and processing to create primary and secondary aggregates for road and drainage construction thus helping to minimise the environmental impact of the project.