Soil Vapour Survey (SVS)

• Soil Vapour Surveys are normally used to determine gas presence before drilling on various types of site including, Petroleum service stations, Chemical plants, and along Pipe lines etc.
  
• SVS are normally undertaken by drilling holes into the ground to allow a gas monitor to take readings of any gas traces that are present. Small diameter holes usually (16mm-25 mm diameter) are drilled through soils and weak rock, including clays, silts, sands, gravels and chalk. This is primarily used for shallow site investigations to a maximum depth of 450 mm. In practice, the actual depth achieved is dependent on local ground conditions and underground services.
  

Method & Reinstatement

• A Hilti or similar industrial drill is used to drill a hole powered from an 110v generator. This enables hard surfaces to be cored prior to sampling or testing the ground underneath.
  
• When sampling on soil a spike bar can be used instead.
  
• The hole is reinstated with a grout, cement or tarmac plug dependent on the finish that has been drilled.
  
• On pipeline routes, highways etc. or over large areas the unit can be mobilized rapidly between different hole locations by using a van (fitted with flashing beacons & chevrons) to carry the generator and drill.

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