GBG Australia undertook a geophysical investigation to map the depth to bedrock and the location a histroric drainage ditch under a major road in the North Shore of Sydney, NSW. The project was undertaken as part of the planning processing associated with a HDD bore.
MASW was utilised for the investigation with a Gemetrics Geode seismic recorder being used to record the data. An array of 24, 4.5Hz geophones was utilised for the survey. A sledgehammer striking a rubber plate was used to generate the seismic energy. The work was conducted during daylight and night times hours to maximise data coverage.
All shot locations were taken using a high accuracy DGPS.