Utilities Survey

Surveybase use the latest Ground Penetrating Radar (GPR) technology to detect the location, depth, and path of subterranean utilities. Typically, this is presented on an existing Topographical Survey but can be marked at ground level using colour coded paints.

We offer a 3-tier service including a Level 3 PAS 128 compliant standard;

Level 1 Utilities Survey – Drainage Mapping

Surveybase provide a detailed drainage investigation including, detection and mapping of buried foul and rainwater runs, locating the mains sewer connection and CCTV survey. The CCTV survey delivers a written condition report and video file. The drainage mapping is typically delivered as a 2D utilities plan referenced to a previous Topographical survey.

Level 2 Utilities Survey – Ground Penetrating Radar

Level 2 is a detailed site investigation using Ground Penetrating Radar (GPR) instruments to detect and map buried pipes, cables, objects and voids within the designated survey zone. The survey is traditionally delivered in 2D AutoCAD and referenced to a Topographical survey. However, we are responding to increased commissions for 3D utilities strings in AutoCAD and Revit format.

Level 3 Utilities Survey – PAS 128

A Level 3 Utilities Survey is compliant with the PAS 128 specification. The level of detail is identical to our L2 service but with noticeable differences in terms of process and methodology. PAS 128 begins with consultation to clarify the survey expectation and agree an appropriate and safe approach.

PAS 128 Type D – Research

Online research of Local Authority and Service Provider records. The research is processed as a report and includes prints of the utility plans held on file.

Type C – Reconnaissance

A reconnaissance survey to validate the Type D research and visually record obvious service runs at ground level. Type C delivers a marked-up plan with notes.

Type B – Detection

Undertaken to agreed methodology ) Type B is a full utilities survey using Ground Penetrating Radar (GPR) instruments to detect and map buried pipes, cables, objects and voids within the designated survey zone. The survey is traditionally delivered in 2D AutoCAD and referenced to a Topographical survey. However, we are responding to increased commissions for 3D utilities strings in AutoCAD and Revit format.

Type A – Verification

The physical verification of the survey records with Site Management prior to excavation. Given the potential Health and Safety risk this is a recommended stage in the PAS 128 process.

PAS 128 Methodology

The PAS128 methodology outlined above extends to regulating the intensity of site investigation. PAS classifies the nature of the proposed survey site under 4 further categories; M1 to M4 as follows;

M1 –     A site where the density of services is typical of an undeveloped area; such as greenfield and parkland spaces.

Maximum Survey Grid 10M; Utility Trace Intervals 5M

M2 –      A site where the density of services is typical of a suburban area or where known utilities cross the boundary of the survey zone.

Maximum Survey Grid 5M; Utility Trace Intervals; 2M           

M3 –      A site where the density of services is typical of a busy urban area or for clearance surveys before operations such as borehole drilling, excavation and landscaping.

Survey Grid 2M; Utility Trace Intervals 1M

M4 –      A site where the density of services is typical of a congested town or city centre

Survey Grid 2M; Utility Trace Intervals 0.5M

3D Utilities Survey

We are experiencing an increased volume of commissions to deliver Utilities Survey data in 3D format.

Surveybase offer this service in either 3D AutoCAD or Revit. 3D strings are generated from the survey data and map buried utilities runs; drainage, cables and pipes. The workflow begins in AutoCAD and can be imported to Revit and located to a GPS / OS coordinate.

Service Options

We will develop a survey specification that meets your precise requirements. Typical service options include;

  • Surface Marking
  • 2D Site Plan
  • 3D CAD Strings
  • 3D Revit Strings
  • Drainage Mapping
  • CCTV Survey

Specialist Support and Advice

If you require further information on our Utilities Surveying services or need professional advice, please contact David Ascott direct; david.ascott@surveybase.co.uk.

Request A Quotation

If you are seeking a quotation, please contact Jane Spencer; jane.spencer@surveybase.co.uk


Areas we cover

We operate throughout the UK and with focus along the M4 corridor from South Wales to the South East and the surrounding counties including;

  • London
  • Reading
  • Oxford
  • Swindon
  • Cheltenham
  • Gloucester
  • Salisbury
  • Bath
  • Bristol
  • Cardiff

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