Costain will donate £55,000 to Tyne Rivers Trust after polluting the River Don during a major upgrade to the A19 in South Tyneside.
An investigation by the Environment Agency found the company had breached its environmental permit.
This occurred when contaminated water was washed down highway drains and into the River Don.
Costain submitted an Enforcement Undertaking to the Environment Agency, which the Environment Agency has now accepted.
What is an Enforcement Undertaking?
An Enforcement Undertaking is a voluntary offer made by companies and individuals to make amends for their offending. It usually includes a donation to a wildlife charity to carry out environmental improvements in the local area.
For more information on Enforcement Undertakings and other sanctions see the CIP Environmental Manual.
“A plume of sediment”
Costain Limited had an environmental permit allowing it to discharge water treated by a sediment treatment facility into the River Don during work to the A19 at Testos roundabout.
On 6 December 2019, whilst works were underway, an Environment Agency officer in the area reported a plume of sediment in the river.
Following a dry spell of weather, Costain had 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 suck up all of the dirty water. So, the contaminated water 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, and it caused discolouration for at least 500 metres.
No long-term impact
After the incident the company introduced a new monitoring and maintenance regime. Plus, it implemented training for site staff. Following this, no further incidents occurred.
There was no long-term ecological impact on the river.
Tyne Rivers Trust will use the donation on projects that will improve water quality in the River Don catchment.