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Pride Park Contaminated Land Site

Pride Park Contaminated Land Site. by Angela Varley, Kar-Wai Wong. The Site. Facts 80Ha site Bordered by the River Derwent, and a railway line. The Site. Previous park usage was: Litchurch coke & gas works since 1900s British Rail Locomotive works & sidings Gravel abstraction

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Pride Park Contaminated Land Site

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  1. Pride ParkContaminated Land Site by Angela Varley, Kar-Wai Wong

  2. The Site Facts • 80Ha site • Bordered by the River Derwent, and a railway line

  3. The Site • Previous park usage was: • Litchurch coke & gas works since 1900s • British Rail Locomotive works & sidings • Gravel abstraction • Industrial and domestic landfill

  4. The Modern Era • Ove Arup & Partners employed to create an engineering solution which was • Environmentally responsible • Sustainable • Commercially viable • Based on sound engineering principles

  5. Finding the Problem • Site was investigated • ‘The big problem was that nobody knew the full extent of the contamination which had accumulated over 160 years since the locomotive works started operating there,’ said project manager Gethyn Davies. • 800 soil samples taken • Tested for 22 contaminants including: • Oils • Tars • Heavy pollutants • Radiation

  6. The Problem • It lay redundant and blighted by its previous uses Site hazards included: • Soil and groundwater contamination • Ammonia, oils, tars, heavy metals, boron, coal, creosote, phenols, sulphates • Buried concrete structures • Loosely consolidated fill • Low level radioactive waste • A relatively flat area giving rise to surface drainage problems • Tip producing methane gas

  7. Alternative Solutions

  8. Biological in-situ • Phytoremediation • Sustainable method • Chemical and biological process • Removes water soluble contaminants

  9. Treatment wall • Porous (holey) wall • Contaminants filtered out, clean water passes through • Not used at Pride Park due to risk of ineffectiveness

  10. Solution overview • Bentonite wall • At three kilometres long it is the largest of its kind in Europe, costing £1.6m • Panels sunk to a depth of 10 metres below the surface • A type of mineral deposit consisting principally of montmorillonite clay. • Bentonite has a very high surface area, and when fully hydrates becomes very viscous.

  11. Solution overview • Water containment measures • Flood bund • Raise level of site • Self contained treatment • Groundwater treatment plant • Waste repositories

  12. Implementation of Solution • Trench excavated • Trench kept open by filling with slurry • As excavate, soil-bentonite backfill placed into trench, displacing bentonite-water slurry

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