Since our formation in 1981, WJ has gained an outstanding reputation by working on many of the largest and most complex infrastructure projects in the UK. Throughout 2020 and 2021 the Lower Thames Crossing project called upon our drilling, hydrogeological testing and monitoring expertise.
Pumping tests specified by the client were undertaken to discover the best way to augment a groundwater management strategy during the construction phases. In addition to drilling and installing the pumping test, monitoring wells, and undertaking the pumping test, WJ implemented an extensive monitoring regime that included inline and in-situ multiparameter water quality measurements, flow monitoring, real-time water-level, temperature, and electrical conductivity monitoring, water sampling and quality testing, on-site ammonium testing, as well as daily visual inspections.
This required a significant commitment of resources, especially against the backdrop of COVID-19 restrictions. WJ deployed multiple monitoring teams to ensure sonde installations, in-situ water quality readings, water samples, and water level readings were obtained correctly.
Due to the site’s nature, the mobilisation of groundwater contaminants during test pumping was a concern. WJ was provided with action levels based on baseline sampling results, with an ‘Early Warning’ and ‘Critical Level Warning’ system and associated action plans.
Continuous monitoring of physical parameters (pH, EC, turbidity, dissolved oxygen, salinity, ORP, and temperature) was conducted via an inline water quality sonde in our bespoke pumping test cabin, with readings taken every 10 minutes and automatically transferred for review and analysis. Additionally, sondes were installed in over 36 observation boreholes and stilling wells, providing real-time monitoring of water levels, electrical conductivity, and temperature. This data was accessible via our bespoke online monitoring dashboards.
Through the careful and diligent management of the project manager, project engineer, monitoring supervisor, and all operatives involved, we were able to ensure successful project delivery.
WJ Groundwater has completed similar groundwater management projects in the UK and globally. Click on the links below to learn more about what we do.
Are you ready to see what else our vision can bring to your projects? Why not speak to our team of groundwater experts today?
Copyright © WJ Qatar 2025.
