PAS 128 Underground utility detection, verification and location. Specification

PAS 128 Underground utility detection, verification and location. Specification

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1   Scope

This PAS specifies requirements for the detection, verification and location of existing and new underground utilities.
It applies to the detection, verification and location of active, abandoned, redundant or unknown underground utilities and the location of their associated surface features (e.g. manhole covers and utility markers). It applies regardless of where these utilities are located (e.g. in urban or rural areas, in the street, or on private sites such as hospitals or airfields).
This PAS sets out the accuracy to which the data are captured, the quality expected of these data and a means by which to assess and indicate the confidence that can be placed in such data.
More specifically it covers:
  1. a) project planning and the scoping process;
  2. b) the classification system for quality levels based on survey type, location accuracy, inclusion of post-processing and level of supporting data;
  3. c) desktop utility records search;
  4. d) detection;
  5. e) verification;
  6. f) location; and
  7. g) deliverables.
It does not cover the detection, verification or location of the following:
  1. 1) emergency utility works (as defined by the New Roads and Streets Works Act 1991 (NRSWA) [3]) or where there is imminent risk to life, limb or environment;
  2. 2) underground basements, underground tunnels (including railways, road tunnels and underground pedestrian walkways), plant rooms and non-utility based features (although clients are made aware if such a structure is detected although not surveyed); or
  3. 3) above surface utility infrastructure (such as overhead power or telecommunication lines).
This PAS is for use by practitioners (usually a surveyor, geophysicist or subsurface utility engineer). The PAS might also be of interest to clients (such as engineers, constructors, project managers and utility owners) who are responsible for recording information about underground utilities. Annex B and Annex D are aimed specifically at the client and explain how to use this PAS and some of the limitations associated with the two main utility detection techniques specified. Annex E sets out an example project workflow which, if adopted, and if appropriate for the scope and nature of the project, can maximize the benefit to both client and practitioner of this PAS.
Where ground investigation, borehole, trial pit works and other construction works are proposed, a current utility mapping survey conforming to this PAS can be used as an indicator of the presence or absence of underground utilities before conducting further ground investigation prior to breaking ground.
It is good practice to undertake a full detection survey prior to the development of a site, so this information can support and inform the safety and progress of the project from before the initial ground investigation through to design and construction phases. If a full detection survey is not available prior to a ground investigation, then this specification can be used to support the detection, location and avoidance of buried services as part of a permit to break ground safe system of work, as set out in Annex A.