Project:   Survey of Pipeline River Crossing Client:     Transco
	In order to confirm the integrity of their installations, Transco engaged Caledonian Geotech to undertake surveys of 23 sites where gas transmission pipelines pass beneath river channels. The project was particularly intended to monitor the condition of the crossing together with depth of burial of the pipeline, its consequent potential exposure to undesirable external influences and the condition of the adjacent river banks.
	A variety of tasks was completed during the survey. Detection of the pipelines, in both plan and elevation, was achieved with an EM locator unit modified to operate with a submersible marine antenna. Once identified, the topography of the river banks and bathymetry of the bed were surveyed. The susceptibility of the crossing and the adjacent reaches to erosion was examined by an engineering geologist and a photographic record maintained for future reference. Any exposed pipeline sections were videotaped. The contract provided the Client with guidelines on his requirement for operational maintenance and indicated the locations of potential scour and erosion.
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