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Thornhill Gas Pipeline, Lough Foyle Shallow Marine Geotechnical & Geophysical Investigations


Firmus Energy Ltd



Contract Period

2 Months

A combined marine geotechnical and geophysical investigation was carried out along the route of a proposed new gas main, crossing the River Foyle close to Lisahally Port.

The site Investigation comprised the following elements:

  • Undertaking a bathymetric survey along the route of a new proposed submarine pipeline
  • Sub Bottom profiling of river bed sediments using both Geoaccoustics CHIRP sub-bottom profiling system.
  • Side scan sonar survey using a Klein 3000 “tow fish”
  • Magnetic gradiometry survey to locate and identify buried metallic debris
  • 6nr marine cable percussion with rotary core follow on to depths of up to 25m below river bed, undertaken from a jack up barge.
  • 3nr land cable percussion and rotary boreholes at landfalls on the north and south river banks
  • Laboratory testing
  • Factual and interpretative reporting