Japanese knotweed remediation, Kingston-upon-Thames

Japanese knotweed remediation, Kingston-upon-Thames

The brief

Our brief was to advise on and implement a strategy to deal with a stand of Japanese knotweed which was within the construction footprint of a new treatment facility at Hogsmill Sewage Treatment works.

What we did

Using a 14 tonne excavator and two articulated dumpers, we excavated the Japanese knotweed stand and moved it and associated contaminated soil to a designated area on the site. We stockpiled it onto root barrier membrane which prevented it contaminating the ground underneath and also shaped it to blend in with the existing landscape. This was away from the construction area so that any re-growth of Japanese knotweed could be treated with herbicide over a two year programme.

Adding value

We provided an in-house Japanese knotweed clerk of works, who ensured that the excavation continued until rhizome fragments were no longer visible. He also monitored the dumpers to ensure that they were kept at a safe load to avoid contaminated material spilling during transportation.

We put in place bio-security measures to stop the spread of contaminated material. This included the installation of Heras fencing and signage in order to exclude unauthorised contractors and personnel from the works area. In addition, washing stations were used to clean boots and plant prior to leaving the site.

The outcome

The Japanese knotweed stand was successfully moved and stockpiled. The work was completed ahead of schedule, enabling our client to get a head start on their construction programme. In addition, we were pleased that our site supervisor was praised by our client on his management of the works.

It is vital when treating invasive species like Japanese knotweed that every care is taken to prevent further spread of the species. We put in place bio-security measures to stop the spread of contaminated material on this site, and successfully moved and stockpiled the Japanese knotweed ahead of schedule.
Thomson project manager, Japanese knotweed remediation, Kingston-upon-Thames
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Environmental consultancy services covering all ecosystems

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Working in partnership with our clients, our team of environmental specialists ensures objectives are met, with maximum efficiency for our clients, and minimal impact on the natural world.

Projects Japanese knotweed remediation, Kingston-upon-Thame...