It is preferable when undertaking service location and potholing to engage a surveyor for the accurate mapping (or as-builts) of any services identified or exposed. Service locators typically use spray paint or crayons to mark the results of the service location and these may disappear in a matter of days if they are marked on grass or if rain immediately follows the exercise. In relation to potholing it is not safe to leave exposed trenches open as they become a fall hazard for workers and the public so it is imperative to quickly have the surveyor locate & record the service prior to backfilling and reinstating the ground above the surface. The surveyor not only records the position and levels of the service, they also capture other attributes such as pipe materials, diameters that may be of benefit to designers.
Underground services that are located by a surveyor can be added to a Detail Survey plan that shows the positions and levels of the service along with reference data such as property boundaries and adjoining topographical features such as buildings, footpaths or kerbs. The data captured in the field is very data rich and it is not easy to create plots that contain all the features or attributes of the underground services, especially being able to differentiate when they may be captured via a mix of service locator, potholing or other methods. To clearly portray this information Bennett + Bennett adopt the Subsurface Utilities Standards (SUI) for conveying underground services on our survey plan deliverables.
Look out for Part 2 of this (3 Part series) on the ‘Capture & Recording of Underground Services – Australian Standards’ to be released next week. Part 3 to follow the week after.
If you have any questions on this topic then please contact Paul Cracroft-Wilson on 07 5631 8000 or firstname.lastname@example.org