In addition to our standard electromagnetic location (EML) survey and cover lifting exercise, we deploy state-of-the-art ground penetrating radar techniques to identify and resolve any non-conducting services (such as PE gas or water, PVC ducting etc.). The use of multiple techniques ensures the highest detection levels of metal, plastic, masonry, ceramic, cables and buried structures such as basements.
We deploy the GPR in a dense grid of orthogonal transects across the entire site to build up a complete 100% three-dimensional map of the area. The GPR data collected is then processed and interrogated back in an office environment. This approach increases the potential to resolve multiple targets, which is of increasing importance in urban contexts.
All ground trace markings and GPR grids are accurately established and incorporated onto a base map to produce high-quality final CAD drawings with all records of existing utilities.
Our plans can be tailored to suit the client needs and outputted in a variety of formats.
All GPR utility survey drawings are output in CAD and PDF formats with a report and are to PAS 128 Type B survey standard.
We are licensed by Ofcom for the use of ground penetrating radar.
PAS 128 - The new standard in Utility Mapping
In 2014, the British Standards Institution (BSI) issued a new Publically Available Specification (PAS) 128, which specifies the minimum that should be done in respect to underground utility detection, verification and location, and also provides guidance and pointers to best practice.
RSK are proud to have been part of the team that helped develop the new standard. RSK's George Tuckwell was on the steering committee developing the standard, and was seconded onto the drafting panel to help write the section on detection (To view George's presentation of the standard click here).
PAS 128 gives the client much more control over the specification of the survey and the tools to hold the practitioner accountable for their data acquisition and deliverables. Utility surveyors can no longer operate to unknown levels of quality that produce varying levels of detail and then hide behind the “black box “ of GPR as an excuse.
The new PAS 128 standard sets out 4 category types (levels of accuracy) of survey:
RSK offer all the above surveys, and is fully PAS 128 compliant.
- Level D - Desktop utility records search
- Level C - Site reconnaissance
- Level B - Utility detection using EML and GPR
- Level A - Verification via intrusive inspection