The works associated with the survey program shall include the acquisition, processing and interpretation of appropriate topographic/bathymetric, hydrographic, high resolution geophysical, seismic (2DHR) and geotechnical data, as required to:
— establish the onshore topography and seabed bathymetric surface (DTM),
— interpret the sub-surface (onshore and seabed) stratigraphy and shallow geology from high-resolution geophysical datasets, correlated with geotechnical sampling and in-situ testing,
— identify potential hazards (geological features and geotechnical phenomena) to installation and /or operation of the pipeline through the project life, as input to geohazards risk assessment.
The surveys shall be performed through planning, field work, data processing and reporting/charting to the highest applicable industry standards for a large diameter submarine pipeline system.
The results from separate work tasks shall be fully integrated with other related tasks at each stage of task reporting, with a final integrated report to be delivered following the completion of the survey.
Candidates shall provide all necessary vessels and equipment to safely perform the work. Equipment shall include the following, and for deep water operations shall be depth rated to a water depth of approx. 2 330 m:
— Offshore:
—— multi-purpose offshore survey vessel for deployment of conventional survey equipment and AUV,
—— deep water AUV (autonomous underwater vehicle) with pipeline route survey payload,
—— surface and underwater positioning systems,
—— precision echo sounder,
—— multi-beam echo sounder(s): shallow and deep water depth rated,
—— sub-bottom profilers (shallow and medium penetration),
—— 2DHR seismic system,
—— piston gravity corer,
—— cone penetrometer,
—— box corer
—— vibrocorer
— Nearshore:
—— survey launch,
—— survey positioning system,
—— self-elevating platform,
—— multi-beam echo sounder,
—— sub-bottom profilers (shallow and medium penetration),
—— seismic refraction spread,
—— vibrocorer,
—— borehole capability,
— Onshore (Nearshore and Landfall):
—— survey control,
—— topographic survey,
—— sub-surface profiling systems (resistivity and/or refraction),
—— geotechnical (borehole) drill rig,
— All surveys/site investigation:
—— all necessary recording and processing systems, communications system,
—— geotechnical laboratory testing services (for standard and advanced tests),
—— reporting and charting services.
The Contractor will be responsible for safety, access and operational control of the entire Services, as well as for the obtainment of any permit and fulfilment of any other requirement from relevant authorities, as required for the performance of the services.