Working on a South Wales Trunk Road Agent (SWTRA) project near Pontypridd, Japanese Knotweed Ltd (JKL) have completed 5 weeks of knotweed remediation works.
The construction of the new roundabout required the disturbance of large stands of Japanese knotweed. Due to the extent of the knotweed it was important that remediation methods other than excavation and removal to landfill were explored. SWTRA ultimately approved a methodology of excavation and sifting to extract knotweed from the soil and reduce the volume of knotweed waste that needed landfill disposal.
The knotweed was fully excavated before being mechanically screened and placed on a conveyor belt. The conveyor belt led the soil up into a suspended gallery picking bay where a team of 6-8 persons manually extracted knotweed material from the soils.
The sifting and picking process is estimated to have extracted around 90% of the knotweed material from the excavated soils. The end product is a soil containing a low volume of fragmented or small rhizome pieces. Regenerative growth from the remaining knotweed rhizome will be weak and susceptible to herbicide. These soils were re-used on site in the landscape verges, which are to be hydro-seeded. The re-used soil areas will then be monitored and knotweed re-growth spot treated with systemic herbicide. This methodology has remediated the knotweed and enabled the construction project while costing typically 80% less than a full dig and landfill disposal method.
Japanese Knotweed Ltd are highly experienced in working on large infrastructure projects. We ensure our clients receive an efficient and effective knotweed remediation service. To enquiry about our services please call us on 0333 2414 413.