PAS128 – A New Specification for Underground Utility Detection, Verification & Location

British Standards Institution PAS 128, Specification for underground utility detection, verification and location is the new publicly available specification document which allows the utility survey industry to deliver its services to a recognised level of accuracy. Although it is aimed at the survey practitioner, we understand that our clients need a know how to specify a PAS 128 survey.


What is PAS128?

PAS 128 provides a robust methodology for delivering utility surveys in the UK. It focuses on levels of accuracy – referred to as Survey Category Types – that you can specify when requiring a PAS 128 compliant underground utility survey.


PAS128 aims to provide the following:


It is expected that with time, education and experience by applying PAS128 standard this will lead to more effective planning and safer execution of street works, civil works, ground works and utility based activities.

Safedigging Ltd provides you with a utility identification service for all your project requirements; from obtaining Utility record information, to liaising with clients and site personnel we can deliver a friendly professional personal service for all our clients.

Our Utility Detection and mapping services are offered at various levels of detail, which can be selected by you, depending on the site-specific survey requirements.

Type D

Desktop Utility Record Search: Where underground utilities are identified through the collation and analysis of existing paper/online records. (NOTE: Type D not located by geophysical methods).

Type C

Site Reconnaissance: Where existing records are supported and validated by the visual inspection of physical evidence observed during a site visit.

Type B

Detection: Where underground utilities are observed and located by geophysical techniques, (Electro-magnetic theory and GPR - Ground Probing Radar application) to obtain a horizontal position and/or vertical position.

Type A

Verification: Where underground utilities are observed and located in an inspection or manhole chamber or excavated and exposed. This may be by strategically positioned vacuum excavation, hand dug trail pitting or by visual inspection within a utility chamber


The Benefits


Survey Planning

Typically a client and survey practitioner will have a discussion/meeting to discuss the appropriate PAS128 Survey Category Type (D to A) and the particular survey methodologies to be used. each project is different and there are many combinations and factors that may need to be discussed. the survey practitioner shall advise the client on the best and most appropriate methods based on the information given.


Post Survey Meeting

Post survey, a discussion and/or meeting takes place so that the survey practitioner can explain to the client the accuracies achieved and any limiting factors. At this point it may be appropriate to suggest other methods of survey to achieve greater levels of accuracy in areas of concern/strategic project importance, a survey report will also be provided with any supporting evidence.





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Safedigging Limited

Unit 24, Coker Road
Worle Industrial Estate
Weston Super Mare
North Somerset
BS22 6BX

Tel: +44 (0) 800 689 5315

Fax: +44 (0) 800 689 5316

Email: info@safedigging.com.


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