PAS 128:2022

What has changed since the last update?

This is a revision of PAS 128:2014. The major changes in PAS 128:2022 are:

1. Addition of guidance on training and qualifications of practitioners
2. Updates to the application of post processing in detection surveys
3. New specification for buried utility detection and avoidance to support on-site permits to break ground
4. New guidance on the accuracy of detection methods
5. New guidance on the technical factors that dictate the effort required for a detection survey

What is PAS 128 - Underground utility detection about?

Sponsored by the Institute of Civil Engineers, this standard provides a way to accurately map underground utility networks. PAS 128 is a full revision of the 2014 edition.

Who is PAS 128 - Underground utility detection for?

PAS 128 on underground utility detection can be used by:

• Practitioners such as surveyors, geophysicists, and subsurface utility engineers
• Clients such as engineers, constructors, project managers and utility owners who are responsible for recording information about underground utilities

What does PAS 128 - Underground utility detection cover?

PAS 128 on underground utility detection specifies requirements for the detection, verification and location of existing and new underground utilities including 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).

PAS 128 also 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. Specifically, it covers:

1. Project planning and the scoping process
2. The classification system for quality levels based on survey type, location accuracy, inclusion of post-processing and level of supporting data
3. Desktop utility records search
4. Detection
5. Verification
6. Location
7. Deliverables

Why should you use PAS 128 - Underground utility detection?

PAS 128 on underground utility detection has many benefits. These include: 

• This PAS can lead to more effective planning and safer execution of street works, civil works, ground works and utility-based activities
• It provides clarity about the service provided and methods employed; a consistent approach to data capture; and accountability for the work undertaken
• It can be used to indicate the presence or absence of underground utilities before conducting further ground investigation prior to breaking ground
• It 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
• It enables better informed decisions using more complete, up-to-date, and accurate data, helping ensure the safety and timely progress of site development
• It can help prevent or reduce conflicts, delays, unnecessary work, damage to third party assets, utility service disruptions, redesigns, personal injuries and even loss of life
• It can supply data that could lead to unrealized benefits, such as the use of remote robotic techniques that reduce the need for intrusive maintenance
• It can help improve asset modelling capabilities
• It can help manage risk, improve efficiency, and develop users’ expertise