Costain’s environmental permit allowed it to discharge water treated by a sediment treatment facility into the River Don during work to the A19 at Testos roundabout. However, an Environment Agency officer in the area reported a plume of sediment in the river on 6 December 2019, while works were ongoing.
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The incident happened following a dry spell, when Costain decided to jet wash and sweep the road surface to remove a build up of mud.
But the road sweeper was not powerful enough to remove all the dirty water and it ran directly into highway drains, bypassing the company’s sediment treatment measures, and into the River Don.
The silt in the water was vastly in excess of what the permit allowed, causing discolouration for at least 500m.
Enforcement Undertaking
After the incident the company introduced a new monitoring and maintenance regime as well as training for site staff, and no further incidents occurred. There was no long-term ecological impact on the river, the Environment Agency said.
Costain submitted an Enforcement Undertaking to the Environment Agency, which has now been accepted.
An Enforcement Undertaking is a voluntary offer to make amends for offences, and usually includes a donation to a wildlife charity to carry out environmental improvements in the local area.
Environment Agency investigating officer Josh Laidler said: “Companies carrying out any major development work have a responsibility to ensure they abide by their permits to protect the local environment, and we will take action when pollution occurs.
“While we will always take forward prosecutions in the most serious cases, Enforcement Undertakings are an effective enforcement tool to allow companies to put things right and contribute to environmental improvements.
“They allow polluters to correct and restore the harm caused to the environment and prevent repeat incidents by improving their procedures, helping ensure future compliance with environmental requirements.”
