Page 1 Page 2 Page 3 Page 4 Page 5 Page 6Remove the risks associated with ground contamination on the site in the form of Chromite Ore Processing Residue (COPR) while ensuring no risk of contamination of the River Clyde and avoiding negative impacts on the existing geo-technical properties of the shallow soils. The Problem The Solution Due to the size of the site and the development of an effective treatment process using a more reactive chemical reductant, the project team designed and constructed a bespoke batching, mixing, distribution and injection plant on a scale never seen before with a central batching area delivering chemicals to ‘satellite’ injection teams. Carefully controlled doses of solution were injected under low pressure via steel rods inserted into the ground at 6,721 locations and 200mm vertical intervals. The injection works successfully treated around 70,000 cubic metres of chromium contaminated soils to a depth of 6 metres below ground within the saturated zone. In conjunction with the in-situ chemical treatment of the hexavalent chromium, 50,000 tonnes of demolition waste, surface concrete and foundations were processed, re-cycled and re-used on site.