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    Successful collaboration for gasworks remediation

    National Grid Property Holdings knew its land, a former gasworks, was heavily contaminated by dense non-aqueous phase liquids (DNAPL), including coal tar. It wanted to sell the land but needed a specialist to investigate the extent of the contamination and devise a suitable remedial strategy. RSK was hired for its reputation and professionalism. So, a trio of companies mobilised: RSK Geosciences and RemedX to design and interpret all the investigations and Structural Soils to complete all the on-site drilling.

    Sharing the load and problem-solving

    The RSK–RemedX team investigated the extent and properties of the DNAPL contamination in the ground, air and water while refining remedial options through pilot trials, which they would distil further to inform the final strategy for the client. Structural Soils’ detailed drilling revealed complex ground conditions: basalt mixed with sedimentary rock at shallow depths. Boreholes revealed pervasive DNAPL contamination and accumulation throughout the site. The natural fractures enabled DNAPL to seep to depths of 10–20 m in both the basalt and sedimentary rock; DNAPL was also retained in below-ground structures associated with the former gas works. DNAPL movement was driven mainly by the fracture flow, which made planning remediation more complex. Significant differences were found in the properties of the DNAPL throughout the site, so the data mined from the laboratory and on-site testing refined the remedial strategy.

    Pilot testing and clean-up

    Through preliminary remedial appraisals, the team identified the best techniques for cleaning up the site, including groundwater and NAPL extraction (total fluids) at ambient temperature; dual-phase extraction at ambient temperature; thermally enhanced water flushing; total fluids extraction; steam injection; and steam-enhanced dual-phase extraction.

    RemedX’s multi-technology team carried out several trials in well arrays (previously drilled and installed by Structural Soils) to determine the most effective techniques. For well arrays in the made ground, eliminating contamination was complex, whereas wholesale removal of DNAPL from the sedimentary rock and the more competent basalt was easier to complete.

    After collating and interpreting the data, RSK completed its report and recommended measures for the client to meet its principal aim. The project was successful and received widespread industry acclaim: it was highly commended in the best site investigation category of the Brownfield Briefing Awards in 2018.

    • Location: England
    • Project status: Complete
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    💧 Actively restoring rivers by reinstating natural river processes will play a vital role in helping offset the global freshwater biodiversity crisis.

    💡 In this insight, Dr Hamish Moir and Peter Downs from @cbec_eco_engineering_uk, an RSK company, explore how sustainable approaches to river management can help protect us from flooding and droughts.

    Read more in our bio!

    #Biodiversity #Climate #Water #ClimateChange #ClimateCrisis #Floods #Droughts

    👏 Grace Kassimoto is the only acoustic specialist from and working in East Africa.

    💚 In our latest #ADayInTheLife, she discusses how she is leading the way for women in a traditionally male-dominated industry and what she enjoys most about her role.

    Read her story in our bio!

    #Acoustics #Environment #WomenInStem #Engineering #Leadership #Africa

    📢 We are proud to sponsor the #GreenEnergyAwards 2022, an event organized by Scottish Renewables

    🏆 This ceremony aims to recognise the inspirational organisations, people and projects going above and beyond to make a real difference to the health, wealth, and wellbeing of Scotland

    We can't wait to see you there!

    📅 1st December 2022
    📍 Edinburgh

    #RenewableEnergy #Renewables #Scotland #Energy #GreenEnergy #Awards

    📸 #selfiesonsite 🤳

    Tom Peart, Principal Surveyor at @centara_ltd, out on-site in Rotherham.

    Want to join our team? View our latest opportunities 👉

    #RSKgroup #behindthescenes #meettheteam #RSKfamily #RSKonsite #culture #construction

    🐟 Concern was recently raised in France with regards to the health of marine ecosystems.

    📌Join RSK France's webinar, in collaboration with law firm Franklin and TechWorks Marine, to discuss the sustainable support of renewable energy in the marine environment.

    Register now in our bio!

    #RenewableEnergy #Environment #Marine #Nature #Compliance #Energy #GreenEnergy

    📢 November is a month dedicated to men’s health.

    🌍 On November 19th, we celebrated #InternationalMensDay, a global holiday that highlights the positive value men bring to the world.

    🤝 This year, men around RSK are taking part in #Movember, an initiative that involves growing a moustache during November to raise awareness of men’s health issues.

    💚 We want to thank Greg Cole, James May, Jiano Pulickal, Matthew Bayliff, Maxwell Robinson, Sam Oakley, Tom Llewellyn, Tom Semmens and Yusuf Aoulad-Ali for participating in this great initiative!

    #Wellbeing #MensHealth #MentalHealth #WorkCulture #Culture