In 2010 Locaters devised, and delivered to our clients, a unique Utility Positioning Classification (UPC) system to communicate the certainty in field markings and utility plans. This simple language for conveying the precision of a utility’s position ensures designers, engineers and field personnel can be confident of the level of accuracy.
In 2013 the Australian Standard AS5488, Classification of Subsurface Utility Information (SUI), was published. Locaters’ UPC system is aligned to the SUI standard.
The Locaters UPC system uses four levels of classification to depict the varying certainty of utility positioning.
|A = Validated||Measured directly to utility|
|B = Traced||Electronic detection of utility|
|C = Aligned||To utility surface features (pit to pit)|
|D = Indicative||As per utility plan or “best guess”|
As the certainty of a utility’s position increases the risk of conflict decreases however it cannot be eliminated. Below are images we have developed for our clients to explain the UPC system and the levels of implied accuracy and corresponding risk.
Moving from D to A
With Class D indicating low-level certainty, this classification can be used to quickly capture all the utility information for an initial design. Selective spending on subsequent investigations will progress the quality of the utility information in targeted areas.
Unlike conventional plans, Locaters utility plans clearly communicate the UPC information allowing the recipient to understand exactly how successful the investigation was or, what limitations may have existed making them a more effective tool for future use.
Below is a preliminary investigation using the Locaters’ UPC system. Areas of potential utility conflict would be brought to Class A before final design, construction or excavation.