Buried Services Tracing

With the introduction of PAS 128, clients can request 4 levels of Utility Mapping, these are:

Quality Level D:

Request all utility record information from all of the relevant asset owners.

With this survey level, we provide the client with all the stat plans from the asset owners. This will show the client where the main lines of the asset are based. This survey is often know as a Desktop Survey.

Quality Level C:

Request a Site Reconnaissance Survey.With this level of survey, the records from Quality Level D are cross checked along with a site visit by an experienced utility mapper.We go to the area and locate the physical features that support the existence of utilities in the survey area.This includes the type and markings of utility related surface features, measurements between known surface features on the ground compared with those depicted on the plan, differences between the map/drawing or digital features supplied and those extant on the ground.

Surface features to be included in the on-site checks shall include as a minimum:

Manhole and inspection chamber covers, valve covers, utility markers, control and distribution pillars and columns, LV power, street lighting, traffic lights, and historic excavation scar lines.

Quality Level B:

This level of survey incorporates levels C & D with geophysical methods.This involves electromagnet and ground penetrating radar surveys of the whole site area.This includes depths and positions on all utilities including, but not limited to:

  • Electricity
  • Gas
  • Water
  • British Telecommunications
  • Drainage
  • Fibre Optics
  • Radio Signals
  • Camera Cables (CCTV)

Post processing can also be requested on the Radar data. This gives more accuracy and allows a greater picture into the ground for the client.

Quality Level A:

This level of survey incorporates levels BC & D and gives the same level of information of the three levels above, but also backs up the data with a series of excavations to expose the target utilities within the survey area.Once the client has received the finished drawing for Quality Level B, they can choose the areas that they would like to have the utilities exposed in and then the data confirmed on site can they be added to the drawing with the quality and accuracy updated if necessary.