The Environment Agency produces the generic risk assessments for all standard rules permits. These list the potential risks and specify the measures (but they are not limited to) required, to manage them.

Check this generic risk assessment to understand:

• the potential risks of sorting, cutting, pulverising, shredding, blending, chipping, pelletising and briquetting waste wood
• how to manage the risks effectively

If your proposed activity has the same risks and can you apply for the standard rules permit.

Each risk comprises:

• information about the source, pathway and receptor – and the potential harm to that receptor
• a judgement of the level of risk and justification of that judgement
• actions for managing the risk (through permitting) and a residual risk rating after managing it

Risk management involves breaking or limiting the source-pathway-receptor linkage to reduce the risk. If we set minimum distances we explain the basis of the distance, for example by modelling.

We will control the residual risk (after risk management) when we assess compliance.

If you need to check the meaning of any terms we have used (in the context of this risk assessment), see the explanation of terms.

Risk assessment parameters

This generic risk assessment is based on the following parameters.

Parameter 1

These permitted activities:

• acceptance and storage of waste wood (R13)
• sorting, separation, cutting, pulverising, shredding, chipping, blending, pelletising and briquetting waste wood for recovery (R3)

Parameter 2

The permitted waste types are restricted to those listed in Table 2.3 of the permit.

Parameter 3

Quantity of waste accepted at the facility is restricted to no more than 50,000 tonnes each year.

Parameter 4

All waste listed in Table 2.3 shall be stored and treated on an impermeable surface with sealed drainage system.

Parameter 5

The only point source discharges to controlled waters are clean surface water from the roofs of buildings and from areas of the facility not used for the storage or treatment of wastes. No other direct or indirect discharges are permitted.

Parameters 6 to 12

The activities shall not be carried out within:

• 200m of a workplace or residential dwelling
• 200 metres of a European site, Ramsar, Site of Special Scientific Interest or Marine Conservation Zone
• 50 metres of a National Nature Reserve, Local Nature Reserve, Local Wildlife Site, Ancient woodland or Scheduled Ancient Monument
• 50 metres of a site that has species or habitats protected under the Biodiversity Action Plan that the Environment Agency considers at risk to this activity
• 10 metres of any open water course
• a groundwater source protection zone 1 (SPZ1)
• an Air Quality Management Area (AQMA) designated for particulate matter PM₁₀

Parameters 13 and 14

Wood of more than 150mm in length cannot be stored for longer than 6 months.

Wood of less than 150mm in length cannot be stored for longer than 3 months.

Parameter 15

There are no point source emissions to air.

Parameters 16 to 22

Fire prevention conditions address risk of self-combustion and require:

• no more than 750 cubic metres of waste wood of more than 150mm shall be stored in any one stack
• no more than 450 cubic meters of waste wood of between 30 and 150mm shall be stored in any one stack
• no more than 300 cubic meters of waste wood of less than 30mm shall be stored in any one stack
• no waste stack shall be higher than 4 metres
• wood stacks shall be located 6 metres or more from each other unless an appropriate fire wall is used with at least 1 metre freeboard
• wood stacks shall be subject to a minimum of weekly monitoring of the surface and internal temperature of the stack, including temperature monitoring when loads are first deposited at the site
• trained staff shall be able to access the site and plant and machinery to move wood as necessary and within 30 minutes of detection of smoke or a fire

Parameters 23 to 30

The following conditions apply to the shedding of waste wood and require:

• shredder speed shall be kept as low as practicable to minimise the production of fines and particulates
• shredders and areas around them shall be inspected daily and managed to prevent the build-up of particulates
• hoods shall be installed on the shredder outlet points to reduce particulate release
• drop heights from the shredder outlet points and any conveyors shall be minimised
• point-source water misting systems or water sprays shall be installed over the shredder hopper and outlet
• mobile dust suppression units or static misting systems in buildings, shall be used to control point sources of particulates
• dust suppression systems are designed, sited, and maintained to minimise generation of particulates across the site
• shredding of waste wood to less than 30mm in length shall be carried out within a building

Parameter 31

Secondary containment follows the recommendations of CIRIA C736 guidance.

1. Risk to local human population

1.1 Release of particulate matter (dust) and micro-organisms (bioaerosols)

Dust and bioaerosols travel through the air and can be:

• inhaled or ingested

• deposited on garden fruit and vegetables and then ingested

There is a risk of dust and bioaerosols causing:

• respiratory irritation and illness

• gastro-intestinal illness

Judgement of risk

We have judged the:

• likelihood of the hazard affecting the receptor as medium

• overall severity of potential consequences as high

• overall risk rating as medium

The reasons for giving the activity this rating are because:

• permitted waste types are restricted to waste wood and do not include dusts, powders or loose fibres (with the exception of sawdust)

• there is a low potential to produce bioaerosols

• the treatment activities will produce particulate matter

• there is potential for exposure to anyone living or working close to the site (excluding operator and employees)

• there is potential for dust generation from the transfer and treatment activities during prolonged dry periods for example summer months

Managing the risk

The shredding of waste wood to less than 30mm in length must be carried out within a building.

There are requirements in the permit around managing dust from shredding activities.

The permit requires emissions of substances not controlled by emission limits (excluding odour) shall not cause pollution.

It contains setback distances to sensitive receptors including workplaces and residential buildings.

The following actions also need taking:

• all appropriate measures shall be followed as documented in the management system, these could include the use of water sprays and mists, minimise drop heights and so on

• if required dust management plan must be submitted and implemented

Taking these actions will control the risk and rate it as ‘low’.

1.2 Waste, litter and mud on local roads

Vehicles entering and leaving the site risk causing:

• nuisance
• loss of amenity
• road traffic accidents

Judgement of risk

We have judged the:

• likelihood of the hazard affecting the receptor as low
• overall severity of potential consequences as low
• overall risk rating as low

The reasons for giving the activity this rating are because:

• there is a risk of creating unsafe road surfaces in wet weather
• local residents are often sensitive to mud on roads

Managing the risk

Risk management is the same as risk 1.1 along with:

• appropriate measures are required to prevent and minimise emissions, including mud tracking from site and litter must be documented in the management system
• vehicle loads need to be enclosed, or sheeted to prevent dust
• the waste types are unlikely to generate litter
• storage and treatment is on an impermeable surface so the potential for mud is low
• general housekeeping to be addressed by the operator’s environmental management system. Appropriate measures could include clearing waste, litter and mud arising from the activities from affected areas outside the site
• if required, an emissions management plan must be submitted and a risk assessment review done
• the emissions management plan must be implemented if one is required

Taking these actions will control the risk and rate it as ‘low’.

1.3 Odour

Odour travels through the air and can be inhaled. There is a risk of causing:

• nuisance
• loss of amenity

Judgement of risk

We have judged the:

• likelihood of the hazard affecting the receptor as low
• overall severity of potential consequences as low
• overall risk rating as low

The reason for giving the activity this rating is because the waste types in Table 2.3 are not likely to be odorous

Managing the risk

To manage the risk the standard rules permit requires:

• emissions shall be free from odour at levels likely to cause pollution

• an odour management plan should be produced and implemented if required

Taking these actions will control the risk and rate it as ‘low’.

1.4 Noise and vibration

Noise travels through the air and vibration through the ground. There is a risk of causing:

• nuisance

• loss of amenity for local residents and workplaces

• loss of sleep

Judgement of risk

We have judged the:

• likelihood of the hazard affecting the receptor as low

• overall severity of potential consequences as medium

• overall risk rating as low

The reason for giving the activity this rating is because local residents are often sensitive to noise and vibration.

Managing the risk

To manage the risk the standard rules permit requires:

• emissions are free from noise and vibration at levels likely to cause pollution

• a noise and vibration management plan to be implemented if required

Taking these actions will control the risk and rate it as ‘low’.

1.5 Scavenging animals and birds

Animals and birds travel over land and through the air. There is a risk of causing:

• nuisance

• loss of amenity

• harm to human health from waste carried off-site and from faeces

Judgement of risk

We have judged the:

• likelihood of the hazard affecting the receptor as low

• overall severity of potential consequences as low

• overall risk rating as low

The reason for giving the activity this rating is because the permitted wastes unlikely to attract scavenging animals and birds.

Managing the risk

To manage the risk the standard rules permit:

• allows only waste types that pose a low risk of attracting scavenging animals or birds

Taking these actions will control the risk and rate it as ‘low’.

1.6 Pests such as flies

Pests, such as flies can travel through the air or over land. There is a risk of causing:

• nuisance

• loss of amenity

• harm to human health

We have judged the:

• likelihood of the hazard affecting the receptor as low

• overall severity of potential consequences as low

• overall risk rating as low

The reason for giving the activity this rating is because the permitted wastes types are unlikely to attract pests, such as flies.

Managing the risk

To manage the risk the standard rules permit:

• allows only waste types that pose a low risk of attracting pests or flies
• can require changes to the management system to control pests and flies should they arise.

Taking these actions will control the risk and rate it as ‘low’.

2 Risk to local human population and local environment

2.1 Flooding of the site

Water can flood the site during heavy or prolonged rainfall.

There is a risk of waste washed off-site contaminating buildings, gardens and natural habitats downstream.

Judgement of risk

We have judged the:

• likelihood of the hazard affecting the receptor as low

• overall severity of potential consequences as medium

• overall risk rating as medium

The reasons for giving the activity this rating are because:

• the permitted waste types are non-hazardous and therefore the risk of contamination is not considered high

• leachate and run-off from some of the waste types may have a high suspended solids content and may contain metals and contaminants from treated wood

Managing the risk

Standard rules permits are not usually issued in flood risk areas.

To manage the risk the standard rules permit requires:

• compliance with the sensitive location exclusions

• a written management system that identifies and documents the process controls to minimise the risk of pollution – includes those arising from operations, maintenance, accidents, incidents, and non-conformances

The accident management section of the management system covers:

• assessing the risk of flooding and measures to prevent or reduce the risk

• contingency plans for diversion of waste, if required

• emergency procedures which must be clearly communicated to all site operatives

Taking these actions will control the risk and rate it as ‘low’.

2.2 Fire risk

There is a risk of fire on-site from:

• arson and, or vandalism

• spontaneous combustion from uncontrolled decomposition

Fire can cause:

• polluting materials (smoke or fumes) to travel through the air, water or over land

• spillages and contaminated firewater by direct run-off from the site and through surface water drains and ditches

We have assessed the potential harm as:

• respiratory irritation, illness, and nuisance to the local population

• injury to staff, firefighters or arsonists and vandals

• air, water, or land pollution

Judgement of risk

We have judged the:

• likelihood of the hazard affecting the receptor as high

• overall severity of potential consequences as high

• overall risk rating as high

The reason for giving the activity this rating is because combustible wastes are listed in Table 2.3 of the permit and there is a risk of self-heating with some wood wastes.

Managing the risk

To manage the risk the standard rules permit contains specific fire prevention conditions and storage times.

It also requires:

• a written management system that identifies and minimises risks of pollution, including those arising from operations, maintenance, accidents, incidents, non-conformances - therefore includes measures to prevent and control fires, including containment of fire waters

• a site-specific fire prevention plan can be required

• a robust waste acceptance procedure

• no burning of wastes allowed

Taking these actions will control the risk and rate it as ‘low’.

3. Risk to local human population, livestock and wildlife

3.1 Gaining unauthorised access to site

There is a risk of direct physical contact with all on-site hazards such as wastes, machinery and vehicles.

There is a risk of causing injury to humans or livestock.

Judgement of risk

We have judged the:

• likelihood of the hazard affecting the receptor as low

• overall severity of potential consequences as low

• overall risk rating as low

The reasons for giving the activity this rating are because the:

• permitted wastes are non-hazardous

• management system includes procedures for worker and visitor safety

Managing the risk

To manage the risk the standard rules permit requires:

• activities shall be managed and operated in accordance with all appropriate measures and a documented and implemented management system that stipulates all preventative measures and emergency responses should accidents occur (including site security measures to prevent unauthorised access)

• emergency contact details shall be displayed at the site entrance

• visitors should receive a health and safety induction when visiting and must follow the site operator’s instructions

Taking this action will control the risk and rate it as ‘low’.

4. Risk to surface waters close to and downstream of site

4.1 Risk of pollution causing acute effects

There is a risk of pollution from spillage of liquids, leachate from waste, contaminated rainwater run-off from waste wood. 

Contamination can travel through direct run-off from site over the land, surface water drains and ditches.

We have assessed the acute effects as deterioration of water quality.

Judgement of risk

We have judged the:

• likelihood of the hazard affecting the receptor as low

• overall severity of potential consequences as low

• overall risk rating as low

The reasons for giving the activity this rating are because:

• there is potential for contaminated rainwater run-off from waste operations, especially during heavy rain

• leachate may contain suspended solids and contaminants like metals from the treated wood

Managing the risk

To manage the risk the standard rules permit requires:

• all waste must be stored and processed on an impermeable surface with sealed drainage
• a written management system that identifies and documents the process controls to minimise the risk of pollution – includes those arising from operations, maintenance, accidents, incidents, and non-conformances

• all liquids must be in containers with secondary containment

• all secondary containment must meet the requirements of the CIRIA C736 guidance

• run-off is restricted by the ‘emissions of substances not controlled by emissions limits’ rule

• appropriate measures guidance to be followed

• emergency procedures and contingency plans will be clearly communicated to all site operatives

Taking these actions will control the risk and rate it as ‘low’.

4.2 Risk of pollution causing chronic effects

There is a risk of pollution from:

• liquid spills

• leachate from waste

• contaminated rainwater run-off from waste

Contamination can travel by:

• direct run-off from site over the land, through surface water drains and ditches

• indirect run-off through soil

We have assessed the chronic effect as deterioration to water quality.

Judgement of risk

We have judged the:

• likelihood of the hazard affecting the receptor as low

• overall severity of potential consequences as medium

• overall risk rating as low

The reason for giving the activity this rating is because pollution is likely to be detected quickly and the effects are temporary and reversible.

Managing the risk

To manage the risk, take the actions for risk 4.1 along with:

• all liquids must be in containers with secondary containment

• run-off is restricted by the ‘emissions of substances not controlled by emission limits’ rule

• using drainage plans to separate clean and dirty water

• considering this risk in an accident management plan

Taking these actions will control the risk and rate it as ‘low’.

5. Risk to water abstracted from a watercourse

These risks relate to watercourses downstream of a facility and to water for agricultural or potable use.

This receptor is at risk from:

• liquid spills

• leachate from waste

• contaminated rainwater run-off from waste

There is a risk of contaminants travelling through direct run-off from the site across ground surface, via surface water drains and ditches and finally through abstraction. This could have acute effects and cause the closure of abstraction intakes.

Judgement of risk

We have judged the:

• likelihood of the hazard affecting the receptor as low

• overall severity of potential consequences as low

• overall risk rating as low

The reason for giving this rating is because the potential for contaminated rainwater run-off from waste operations carried out in the open, especially during heavy rain.

Managing the risk

To manage this risk, take the actions set out in risks 4.1 and 4.2.

Taking these actions will control the risk and rate it as ‘low’.

6. Risk to groundwater

Groundwater is at risk from:

• liquid spills

• leachate from waste

• contaminated rainwater run-off from waste

There is a risk of contaminants travelling through soil and groundwater which can then be abstracted from a borehole. This could have a chronic effect resulting in the groundwater requiring treatment or causing closure of a borehole.

Judgement of risk

We have judged the:

• likelihood of the hazard affecting the receptor as low

• overall severity of potential consequences as low

• overall risk rating as low

We have given this rating because of the potential for contaminated rainwater run-off or leachate from waste operations, especially during heavy rain. The consequence is based on the possibility of pollution not being detected for a long time.

Managing the risk

To manage the risk the following actions must be taken:

• the activities must not be carried out within a groundwater SPZ1 

• wastes must be treated on an impermeable surface with sealed drainage system to prevent contaminated run-off

• secondary containment must meet CIRIA C736 standards

Taking these actions will control the risk and rate it as ‘low’.

7. Risk to protected sites

Protected sites include:

• National Parks and Areas of Outstanding Natural Beauty

• Marine Conservation Zones

• Sites of Special Scientific Interest

• Special Areas of Conservation

• Special Protection Areas

• Ramsar wetland sites

Protected sites can be at risk from any source and by any pathway.

The risk of harm to protected sites include (but are not limited to) the following:

• nutrient enrichment

• leachate

• contaminated surface water run off

• smothering

• disturbance

• predation

Judgement of risk

We have judged the:

• likelihood of the hazard affecting the receptor as medium

• overall severity of potential consequences as medium

• overall risk rating as medium

The reason for giving the activity this rating is because storing and transferring waste may cause harm to and deterioration of nature conservation sites.

Managing the risk

To manage the risk we require compliance with the standard rules permit, including applying exclusion distances.

Taking this action will control the risk and rate it as ‘low’.

Explanation of terms

Receptor

The things at risk and that need protecting.

Receptors considered include atmosphere, land, surface waters, groundwater, humans, wildlife and their habitats.

A single receptor may be at risk from several different sources and all must be addressed.

Source

The agent or process that has the potential to cause harm.

A contaminant or pollutant (a hazard) that has the potential to cause harm. For example, the activity or operation taking place for which a particular hazard may arise.

Harm

The harmful consequence to the receptor if the hazard is realised.

Pathways

The route or means by which a defined hazard may affect a receptor.

Source-pathway-receptor linkage

There has to be a link between the source, pathway and receptor for there to be a risk.

Likelihood of exposure

This is the likelihood of the receptors being exposed to the hazard. The meaning of the definitions are:

• high – exposure is probable – direct exposure is likely with no or few barriers between the hazard source and the receptor

• medium – exposure is fairly probable – feasible exposure is possible as the barriers to exposure are less controllable

• low – exposure is unlikely – several barriers exist between the hazard source and receptor to reduce exposure

• very low – exposure is very unlikely – effective, multiple barriers are in place to reduce exposure

Overall magnitude of potential consequence

This is the severity of the consequence if the hazard is realised and may cause actual or potential harm.

This will have a high, medium, low or very low rating using attributes and scaling to consider ‘harm’.

Risk rating

We work out the risk rating by combining the likelihood of exposure with the magnitude of the potential consequences.

We assign these ratings:

• high risk – requires additional assessment and active management

• medium risk – requires additional assessment and may need active management and, or monitoring (or both)

• low and very low risks – require a periodic review