Japanese knotweed dig and dump

Dig and Dump

An instant, hassle free and often impressive rectification method that avoids knotweed becoming a long-term problem for the developer and land owner.

Popular Remediation Method

Although Dig and Dump is the least sustainable method of knotweed eradication it is still the preferred method for many. A large part of its continuing popularity with our clients is our expertise in minimising the total volume of waste removed from site while still removing 100% of the knotweed.

Waste Volume Reduction

As well as the waste reduction being part of our on-going success, it’s also a foundation policy of the Environment Agencies 2013 'The Knotweed Code of Practice'. The most recent code puts emphasis firmly on reducing quantities of waste removed to landfill. This is in-line with our standard operating procedures where we always ensure only material contaminated with knotweed (and not clean spoil) is excavated and removed from site.

We achieve waste volume reduction via accurate identification of the knotweed rhizome in the ground, so that only knotweed material and ground containing knotweed is excavated.

We therefore have no need to work to the '7 x 3’ rule (excavating 7m lateral out from the visible knotweed growth and to a depth of 3m) that some contractors still adhere to. In reality we excavate 100% of the knotweed plant while removing over 2/3 less waste from site than those contractors who have dependency on the '7 x 3' rule.

This reduction policy has resulted in considerable financial savings for our clients, as well as relieving some of the environmental impact knotweed excavations inevitably cause. Reducing volume reduces the number of cart-away lorries required and alleviates some of the pressure on the limited landfill resources in the UK (when Japanese knotweed leaves a site is classed as controlled waste and must be handled and disposed of in accordance with the Environmental Protection Act 1990, Duty of Care Regulations 1991).

Contaminated or Hazardous Ground

Prior to removal of the knotweed from the site the landfill operators scientist will need to verify that only spoil containing Japanese knotweed material, and not any other contaminant, is to be received and disposed of. This verification is normally achieved via provision of laboratory soil analysis results from the site.

If other contamination is found (such as elevated levels of heavy metals) we can still remove this waste from site to landfill sites licensed to accept contaminated waste containing Japanese knotweed.

If hazardous levels of contamination are found (such as asbestos) we again can still dispose of this waste for you! This may however require further material analysis such as Waste Acceptance Criteria (WAC) testing. We would remove and dispose of this waste from site as Hazardous Waste containing Japanese knotweed to a specially licensed hazardous landfill site.

Landfill Tax

Landfill Tax has been rising annually for the past few years, and it is set to continue to rise rapidly for the foreseeable future.

The Government launched a Strategy for Sustainable Construction in 2008, containing a number of proposed waste disposal targets for the construction industry to achieve through a series of voluntary agreements and initiatives. A target of a 50% reduction in the amount of construction, demolition and excavation waste (including Japanese knotweed) going to landfill by 2012 was proposed, with an eventual target of zero landfill disposals for 2020.


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