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“Comprehensive Site Investigation for Offshore Wind Projects: TDI-Brooks’ Endeavor in 2023-2024”

Between January 2023 and February 2024, TDI-Brooks undertook an extensive site investigation program across two offshore wind blocks situated in state and federal waters. This ambitious project involved conducting surveys spanning over 20,000 line-kilometers of analogue and either single or multi-channel seismic scans in lease blocks and cable routes along the coasts of New York and New Jersey. The tasks undertaken encompassed various stages, including offshore geophysical surveys, UHRS detailed surveys, archaeological identification surveys, light geotechnical coring, and benthic sampling.

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TDI-Brooks effectively utilized three survey vessels for this endeavor, namely the R/V BROOKS McCALL, R/V MISS EMMA McCALL, and M/V MARCELLE BORDELON. The geotechnical survey component involved the acquisition of over 150 pneumatic vibracores (pVCs) and more than 150 Neptune 5K cone penetration tests (CPTs) from both lease areas and along the offshore cable route (OCR). Additionally, multiple export cable route surveys were conducted, including a reconnaissance survey covering the entire lease area with survey lines spaced at 150-meter intervals, followed by a more detailed archaeological survey with lines spaced at 30-meter intervals.

A comprehensive array of survey sensors, meeting TDI-Brooks BOEM specifications for archaeological surveys, was employed, including dual head multibeam sonar, side scan sonar, sub-bottom profiler, UHRS seismic, single-channel seismic, and Transverse Gradiometer (TVG).

The primary objectives, as determined by the collected data, were to evaluate seabed and sub-seabed conditions, including potential risks such as geohazards or man-made hazards that could impact the future installation of wind turbines and subsea cables.

The investigations involved assessing variations in water TDI-Brooks depth and slope changes, examining seabed morphology and lithology in relation to local geology, identifying natural or man-made obstructions on or below the seabed (such as rock outcrops, channels, depressions, gaseous fluid features, debris, wrecks, industrial structures, and cables), and evaluating shallow geohazards that could affect the sites and future deep geotechnical soil studies within the top 100 meters beneath the seabed.

The collection and analysis of this data play a crucial role in determining the optimal location and design for offshore projects like wind farms. TDI-Brooks reaffirms its commitment to supporting the expanding offshore wind sector and various scientific survey initiatives. Despite the increasing demand for subsea services and evolving client needs, the company remains well-prepared to provide a comprehensive range of offshore support services, including subsea operations, construction support, exploration and production assistance, ROV and diving services, scientific marine research and survey mapping, and military support.

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