Tetra Tech successfully provided quality control (QC) supervision of in-situ geotechnical testing and soil sampling despite the challenges of Covid-19.
QC supervision was to be conducted “in-field”, as per normal Tetra Tech activities, but the COVID-19 pandemic and associated travel and health concerns made this impossible. Working quickly to keep to the project schedule, Tetra Tech, in collaboration with our experienced offshore QC specialists, designed and implemented a remote QC procedure to address the technical, HSE, and communications limitations that were anticipated. Multiple technology and communication platforms were employed to keep the project moving forward.
On completion, our client RVO’s scope of work was fully met, and the data needed to enable a detailed assessment of soil conditions for this wind farm development was acquired, on time.
On March 25th, 2020 at Eemshaven, Netherlands, RVO mobilised Fugro’s geotechnical drilling vessel MV Normand Flower for Lot 1 Phase 2 of the borehole campaign.
The objective of the site investigation was to enhance understanding of the wind farm zone geological features and ground conditions. This was achieved by acquiring appropriate geotechnical data which may be used to progress the design and installation requirements for the offshore wind farm, including, but not limited to foundations and cables.
The site investigation program comprised:
- 48 boreholes with sampling and Piezocone Penetration (PCPT Testing)
- 1 sampling borehole
- 4 PCPT boreholes
- 5 boreholes with sampling, PCPT Testing, and Borehole Geophysical Logging (BGL)
On March 23rd 2020, just two days before planned mobilisation, COVID-19 UK travel restrictions were implemented where HSE became a concern and limited the number of personnel travelling to and joining the vessel. The on-vessel QC role, therefore, needed to be delivered remotely from a secure facility onshore.
With only a few days to modify the project planning, Tetra Tech developed a remote QC procedure to address the monitoring, technical, HSE and communications limitations that were anticipated. Our experience in managing similar projects highlighted some critical activities as:
- Attendance at multiple daily meetings
- Review and approval of the daily progress report
- Observing and QC of PCPT Testing, Seismic Cone Penetrometer, (SCPT) Testing, and borehole sampling
- QC of PCPT and SCPT plots and digital data
- QC of SVP, sample pictures, recovery lists, positioning reports
During the project, Tetra Tech QC reps needed closer access to monitor the PCPT tests in real-time and using Remote View, which displays the data from the operator screen, were able to verify the tests and data.
By designing a novel and innovative solution to deliver geotechnical and HSE QC services remotely, Tetra Tech was able to meet RVO’s technical requirements within the required timeframe.
The vessel arrived back in Eemshaven on June 17th, 2020 after delivering a total of 58 boreholes. Sufficient data was acquired to enable a detailed assessment of soil conditions for the progression of the Netherlands Government tendering process and conceptual foundation engineering.
Benefits
- 17,915 total meters drilled
- 1919 pcs of push sampling (including any oversampling)
- 1129 pcs of downhole PCPT push (up to 3m stroke)
- 185 pcs SCPT push (up to 3m stroke excl seismic tests)
- 168.9 meters–execution of downhole density logging
- 251.2 meters–execution of spectral gamma logging
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The project featured in this article was undertaken by RPS, A Tetra Tech Company and originally published on RPSgroup.com. In March 2026 RPS rebranded to Tetra Tech.