Concrete culvert to support

Woodbridge Town Council are seeking tenders to construct a square section concrete culvert to support a hard-surfaced footway across a ditch with a span of 7 metres. The culvert should extend the full width of the ditch and have an overall height of at least 0.5 metres. The culvert should extend a length along the ditch of at least 3 metres, and be overfilled to provide the base for a hard-surfaced (concrete or hot-rolled tarmac) surface for a footway at least 1.8 metres wide and extending 1 metre each side of the...