Survey Design Services (SDS) - Specialist Survey Contractors

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    Underground Utility location is fast becoming a developer's necessity with on going Health & Safety legislations.


    For many years, SDS has undertaken service location surveys for a variety of clients, from local builders to Water Authorities and large scale Developers.


    Continuing to update our Radiodetection Units has allowed us to stay ahead of competition and ensure that clients keep coming back to receive the highest standard in service location with a Ferrous content.


    Precision Location


    Radiodetections RD4000 units do not only serve well for the location of Sewers, the same Units are used to induce signals onto underground services through a variety of methods, such as:


    1) Induction through positioning of Generator Unit, over service

    2) Direct contact via hard wire Leads which attach to the Metallic Structure / Service

    3) Induction via Coroner Rings, of which we utilise all sizes available, i.e. 100mm Dia - 300mm Dia


    Radiodetection techniques are unable to detect non-metallic buried services such as plastic water and gas pipes, fibre-optics and drainage pipes that we cannot introduce a sonde into. With this potential hazard of the unknown location of services Ground Penetrating Radar (GPR) can be used to supplement the Radiodetection results in the location of these services.


    GPR is able to detect non-metallic as well as metallic pipes. It will also give an indication of the location and depth of buried services but will not identify them.


    Detector Duo


    GPR can also be used for the detection of voids and tree roots.


    GPR does NOT trace services, but indicates the presence of voids, disturbed ground, trenches, pipes and cables under the surface. GPR works by emitting a short pulse of energy into the ground. Echoes are returned from the different interfaces between different materials in the ground. The Survey Results can be temporarily marked on the ground for immediate use on site.


    However, it has become common practice to survey in the results with a Total Station for fast production of accurate drawings.


    This information may be added to an existing Topographical Survey or overlaid onto Ordnance Survey Background with the latest in GPS Equipment.