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The town of Northwich in Cheshire, England has played host to the salt mining industry for 300 years and was the cradle of the modern heavy chemical industry with which it has been associated for approximately 200 years. Historically, the dumping of waste from these industries on adjacent land was unregulated leading to substantial accumulations of ‘legacy industrial solid waste’ (LISW) arising from many processes including brine evaporation and the Leblanc and Solvay processes for soda ash production. This pr...