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On site utility location and mark out surveys:
Accuracy of information is an absolute necessity when planning any work on or near buried utilities and services.

Locating and marking out of underground services are normally carried out prior to commencement of excavation or drilling activities on site. Terra Scan mark-out surveys pinpoint the depth and route of both conductive and non conductive underground services quickly and accurately in order to reproduce an accurate layout of buried services or utilities at visible level.

This service is tailored to customer specific needs and can typically comprise of:
  • Locating and tracing of a specific cable, pipe or other object across a site.
  • To clear a planned excavation or borehole area.
  • A comprehensive full scale mark-out survey of all underground and otherwise buried services on a site, along a road or any other landscape.
For anyone planning to undertake excavation work, the location of and establishing the nature of underground utilities is a step towards statutory compliance with the Occupational Health and Safety Act and Regulations, in particular the Construction Regulations.

(Construction regulations, 2014. 13 (2) (g) and 14 (4) (e))

pdf-icon Download the construction regulations (2.6M)

Ground Penetrating Radar (GPR) surveys:
Terra Scan successfully uses GPR technology to locate and determine the depth and position of metallic and non metallic underground services, location of underground storage tanks (USTS) and associated piping, voids, sub surface concrete structures, utility duct banks, ground variations and location of burial sites.

Our GPR system enables us to confirm the depth of underground utilities which were previously located by means of Electromagnetic (EM) or Radio Frequency (RF) cable locating equipment.
GPR technology can also detect non conductive objects that cannot be detected by EM and RF technology.

Depending on site conditions and the project scope a GPR survey sometimes necessitates the offsite processing of GPR data by making use of advanced GPR data processing software.
Ground Penetrating Radar (GPR) and Cemetery and Grave Sites
Ground Penetrating Radar (GPR) has become the geophysical tool of choice in the identification of poorly marked, unmarked and clandestine grave identification. Services offered by Terra Scan are two fold in nature:

  • Municipal and privately owned formal and informal cemetery management:
    GPR is used (in conjunction with geospatial recording techniques) to identify unmarked graves, facilitating record keeping and administration of these often old (portions of) cemeteries and burial grounds. Identification of unmarked graves within such sites assists in the planning and management thereof.
  • Grave site identification within the Heritage Impact Assessment (HIA) process for environmental and development compliance purposes:
    GPR is used in the delineation of poorly demarcated cemetery boundaries, the adequate recording of cemeteries and burial grounds and the identification of unmarked graves for purposes of conservation or grave relocation, as may be requested by the South African Heritage Resources Agency (SAHRA) or the relevant Provincial Heritage Resources Authority (PHRA) for purposes of heritage compliance within the environmental and development arenas.

    Depending on site conditions and the project scope a GPR survey sometimes necessitates the offsite processing of GPR data by making use of advanced GPR data processing software.
Underground utility locating and mapping surveys:
Where a permanent up to date scaled record of utility positioning on a site is required, Terra Scan will conduct a full scale underground utility survey and then makes use of land surveyors in order to provide colour coded survey drawings of the detected utilities combined with key topographical features. The survey data is referenced to an agreed Datum or an arbitrary Datum assigned to a particular project.
Existing information on underground services or assets are inherently inaccurate. This often relates to sketched information taken when the asset was installed or even worse - taken from design drawings when no accurate "as build drawings" are available.