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We continue to use Online for their reliable and timely service. Their modern CCTV equipment and experienced operators are great.


Woolhara Council

I’ve used OnLine’s services for close to 23 years. We have built a great working relationship based on efficient and professional service and I will continue to use OnLine.


D & W Plumbing

We have a long held relationship with OnLine, they have very experienced operators and their availability is fantastic.


A & G Professional Plumbing

OnLine are a great team to work with. Their prompt timing, friendly service and cutting edge technology suits our business requirements accurately.


Robson Civil

I have been working with Online for many years. I am impressed with their modern equipment and availability. Their operators are always on time and get the results we need.


Blacktown Industrial Plumbing

I appreciate OnLine’s availability, professional service and the great results we can achieve with the modern equipment they use.


SN King Plumbing

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Protecting assets and preventing hazards with GPR


Utility companies need their underground assets to be protected.  For construction companies, underground assets represent a potential hazard.  

Ground penetrating radar is just one of the methods Online Pipe & Cable Locating use to determine the precise location and depth of underground assets.  

Here's a link to a video (published by GSSI) titled What is ground penetrating radar (GPR)? And how does it work?  - which will assist in explaining its application in locating underground pipes, cables, rebar, electrical conduit, underground storage tanks, voids, etc.

    Ground Penetrating Radar on a road surface

    How GPR works

    PR scan showing image of underground assets

Benefits & Applications

  • Portable, fast, and precise
  • Various models to suit site conditions and application - Online Pipe & Cable have GPR devices suitable for depth penetration of 300-400mm up to 2-3m
  • Locates metallic and non-metallic assets
  • Concrete scanning for post- and pre-tension cable / conduit / rebar location, enabling core hole drilling and concrete cutting to be done with confidence
  • Accurate determination of the thickness of concrete slabs
  • Detection of voids which may present serious hazards for excavation and construction
  • Position and depth can be marked out on site and visualised in 3D sub-surface image reports 
  • Non-destructive
  • Ability to scan large areas quickly and accurately
  • Protect underground assets
  • Reducing risks and enhancing safety on site while saving costs and downtime.

NB. for the GPR device to work accurately, the surface should be flat / level and dry. Some soil compositions may mean a limited ability to scan. 

According to Geophysical Survey Systems, Inc. (2015) "In general, dry sandy soils with little salt content return excellent survey resolution, but heavy clay-based soils are difficult to penetrate with GPR. In some situations, penetration depth may be limited to a few feet or less within clays, whereas pipes residing in sandy soils could be detected at depths up to 30 feet."

In order to provide the most suitable locating service, the Online Pipe & Cable Locating team seeks to understand the customer's needs and the unique requirements of the site and project.

Should you have any questions or require further information, please let us know.

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Source:  Geophysical Survey Systems, Inc., 2015. Ground Penetrating Radar Frequently Asked Questions. [Online] Available at: [Accessed 9 December 2015].