Japanese knotweed remediation, Wellingborough

The brief

Our brief was to move two large stands of Japanese knotweed and contaminated soil to stockpiling locations outside the construction footprint, prior to construction works starting.

What we did

We began by clearing scrub and trees within the contaminated areas, being careful not to spread any fragments of Japanese knotweed.

We installed Heras fencing, signage and foot washing stations which would act as bio-security measures for anyone entering or leaving the site.

We excavated the Japanese knotweed into stockpiles using two 30 tonne 360° excavators. This was done under the supervision of a Japanese knotweed clerk of works, who ensured that excavations continued to a point where rhizome fragments were no longer visible.

Two 25t articulated dumper trucks hauled over 12,000 tonnes of the contaminated material to designated stockpiling locations, outside the construction footprint.

Contaminated material was stockpiled onto membrane which prevented it contaminating the ground underneath. The stockpiles were fenced off in order to ensure that contaminated material could not be reached and spread around the site.

The Japanese knotweed in the stockpiles was then allowed to grow and the Japanese knotweed was subject to a spray regime.

The outcome

The Japanese knotweed areas were successfully moved and stockpiled outside of the construction footprint.

Japanese knotweed can regenerate from any small piece of material - root, rhizome, crown or stalk - so it can very easily be spread if the plants are disturbed. It can grow through cracks in walls, tarmac and concrete, greatly reducing land and building values. We provide advice on suitable approaches for invasive species remediation, which can take into account the project programme, and aim to minimise time and costs.
Thomson project manager, for Japanese knotweed treatment, Wellingborough
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Environmental consultancy services covering all ecosystems

We cover all aspects of environmental consultation – from smaller surveys through to strategic projects.

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At Thomson, we strive to deliver a pragmatic and innovative approach to environmental compliance.

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, Wellingborough