​Due date for completion 3.14.1

The contractor must only use materials approved by, and to the limitations set by us.

Specifications for excavation work

Laying, jointing and embedment of pipes must be done in accordance with the following relevant standards, drawings and this specification.

How to backfill the excavation

Placement of backfill is as defined and designated in this section.

The contractor must excavate, supply materials and construct all manholes in accordance with the Drawings, subject to the tolerances specified in Tolerances. N25 Grade concrete must be used, unless otherwise shown on the drawings.

The contractor must carry out an internal visual inspection of pipelines larger than DN 600 nominal size after compaction of the backfill. All defects in jointing and obvious points of infiltration must be noted and repaired to the satisfaction of the Superintendent

Auditing is a process which can be used to verify the output of a supplier's activity or process conforms to the requirements of the customer.