A PAS128 survey is the specification for utility detection, location and verification standard published in 2014 British Standards (BSI).
What is a PAS128 Survey?
British Standards Institution PAS 128 is the current specification for underground utility detection, location and verification. A collaboration between British Standards and the Institution of Civil Engineers resulted in the PAS 128 standard which requires accurate, high quality details to be recorded to a consistent standard with regards to the location of underground utilities. This removes the element of uncertainty, explanation and resultant variable risk while clients and on site teams are referring to utility survey reports.
With more constructive planning and constant collection of data for underground utilities, it can be expected that utility work and ground works will be carried out in a safer manner.
What are the diffrent types of survey?
-PAS 128 Survey Category Type A: Utilities are verified and positioned by eye, using physical identification, which may include visual inspection, vacuum excavation, or hand dug trail pitting.
-PAS 128 Survey Category Type B: Utilities are detected by geophysical methods, such as Ground Penetrative Radar (GPR) to get an exact horizontal position and vertical position i.e depth. Category B Surveys are carried out to one of four levels of accuracy with each requiring a different survey type.
-PAS 128 Survey Category Type C: Underground utility are plotted based only on utility record data, but with on-site investigation to match physical indicators above ground with the records as a best fit.
-PAS 128 Survey Category Type D: Underground utilities are plotted based only on record data, otherwise known as desktop survey.
Conducting A PAS128 Survey
While conducting a PAS128 survey we always use the following methods: a desktop search, EML (CAT Scan & Genny) & GPR. Additionally to a standard utility survey, we check and complete quality levels using the GPR on the services found during EML which isn't done during a standard utility survey.
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