 A lime-burning kiln at the site was closed for a while in 2006 after testing showed quicklime dust was escaping into the atmosphere.The kiln, which produced 200,000 tonnes of quicklime a year for use in the steel industry, required £300,000 of investment to resolve the problems.The closure followed an earlier warning from the Environment Agency when the company was notified that it should tighten up procedures at the site.