PAS 128 provides a robust methodology for delivering utility surveys in the UK.
British Standards Institution PAS 128, Specification for underground utility detection, verification and location is a 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.
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.
See: PAS128 Factsheets
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.
Survey Types: PAS128 takes a hierarchical approach to the survey types used in recognition that different clients at different stages of an asset life cycle will require different levels of detail and confidence in the data provided.
This PAS defines four types of survey representing the different levels of effort required in obtaining information on the location of utilities, whereby the desktop utility records search requires the least effort and verification the most.
A survey type D is a prerequisite for survey types C, B and A. Survey types A to C are independent of each other. For example, a detection survey can conform to PAS128 without the need to conduct a survey type C or A.
Survey Planning: Typically a client and survey practitioner will meet to discuss the appropriate PAS128 Survey Category Type (D to A) and the methodologies to be used. Each project is different and there are many factors that may need to be discussed. The survey practitioner will advise on the best and most appropriate methods based on the information given.
Post Survey Meeting: Post survey, the survey practitioner will explain 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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