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Rail construction loses huge volume of bentonite to UK Chalk aquifer

Vast amounts of bentonite slurry have been lost to the Chalk aquifer during the construction of the high-speed rail link. Monitoring has shown significant effects on pH, turbidity and other water quality parameters. Although long term impacts may be limited, changing climatic conditions could remobilise the lost bentonite causing it to migrate within the Chalk.

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https://www.theguardian.com/uk-news/2021/sep/10/hs2-potentially-highly-polluting-bentonite

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