Dust and noise from a concrete batching plant

A concrete batching plant application is decided on dust and noise, and the two are assessed by completely different methods. Dust is dealt with through containment and management rather than through a numerical limit at the boundary, because there is no statutory standard for deposited dust. Noise is assessed against BS 4142:2014+A1:2019, comparing the rating level of the plant with the measured background sound level at the nearest noise sensitive receptors. Most refusals come from a submission that treats the site as a single source rather than as a yard full of small ones.

Expect the environmental health officer to be the consultee who matters most.

Where the emissions arise

A ready-mixed concrete or mortar plant has a recognisable set of emission points, and naming them individually is what makes an assessment credible.

• cement and powder delivery, when a tanker blows its load into a silo under pressure
• the silo filter and pressure relief valve during filling
• the weigh hopper and the charging chute into the mixer or truck drum
• aggregate delivery and tipping into ground bays
• loading shovel movements between stockpiles and the hopper
• stockpile surfaces exposed to wind
• truck wheels and chassis carrying material onto the public road
• drum washout, settlement lagoons and the water recycling system

Noise sources overlap with those and add others: the mixer itself, air compressors, the blower on a delivery tanker, hydraulics, reversing alarms and the metallic clatter of a shovel bucket striking a bay wall. That last one is the sound neighbours complain about, and it is impulsive, which matters for the assessment.

Separately from planning, bulk cement handling and concrete batching are commonly regulated as a Part B installation under the Environmental Permitting (England and Wales) Regulations 2016, with the local authority controlling emissions to air through a permit. The permit and the planning permission cover different ground, and the authority will expect both to be addressed.

Silos, filters and enclosed conveyors

Cement is the fine fraction that travels, so silo design does most of the work. A modern specification uses a fabric filter on each silo, sized for the delivery air volume rather than for ambient venting, with a pressure relief valve set to protect the vessel and an audible and visual high level alarm to prevent overfilling.

Interlocks matter as much as hardware. A system that prevents a tanker coupling until the filter is confirmed operational removes the most common cause of a cement release. Filter condition monitoring, with a differential pressure gauge and a maintenance log, is the evidence an officer will ask for at the permit stage and is worth offering with the planning submission.

Transfer points between the silo, the weigh hopper and the mixer should be enclosed, with sealed chutes and local extraction where enclosure is impractical. Conveyors carrying damp aggregate are less of a dust risk, but the head and tail pulleys and any transfer tower still need covers.

Stockpiles, haul routes and wheel washing

Aggregate dust is coarser and travels less far, which makes layout the main control.

Monitoring is usually proposed as directional dust gauges or deposition gauges at the boundary with the nearest sensitive receptor, read monthly, with trigger levels agreed with the authority. Where the site sits in an Air Quality Management Area, expect PM10 monitoring to be asked for as well, measured against the national objectives of 40 micrograms per cubic metre as an annual mean and 50 micrograms per cubic metre as a 24 hour mean not to be exceeded more than 35 times a year.

An Air Quality Assessment is the document that pulls that together, and on a site in or near an Air Quality Management Area the local context matters, as our note on Clean Air Zones and what they mean for a development explains.

Noise from loading shovels and reversing alarms

Fixed plant is the easy part. Mobile plant moving around a yard is what breaks an assessment, because the source position changes, the sound is intermittent and the character corrections under BS 4142 push the rating level up.

Reversing alarms deserve particular attention. A tonal bleeper attracts a character correction and is the single most effective thing to design out, usually by specifying broadband alarms, camera systems and a one way circulation route that removes most reversing. Bay walls can be lined to reduce impact noise from the bucket. Compressors and blowers can be acoustically housed, and the tanker blower is often the loudest single event of the day, so its position relative to the nearest dwelling should drive the layout rather than be discovered afterwards.

Illustrative example: a plant 90m from the rear gardens of a terrace, with measured background sound of around 40 dB during daytime. The predicted rating level at the facade is 44 dB before corrections. Add a correction for the impulsive bucket strikes and another for the tonal reversing alarms, and the rating level exceeds background by enough to indicate an adverse impact under BS 4142. Switching to broadband alarms, lining the bays and relocating the tanker stand to the far side of the silo brings the corrected level back towards the background. Those figures are illustrative only.

Assessing a mixed source site

The method that survives scrutiny treats the site as a model rather than as a single measurement.

1. Agree the assessment locations, survey periods and the operating scenario with the environmental health officer before any monitoring.
2. Measure background sound levels over a representative period, separating daytime, evening and night where the plant operates then.
3. Build a source inventory with sound power levels for each item, taken from manufacturers' data or measured on a comparable plant.
4. Model the operating case with mobile plant positions and movement frequencies, not a single static point.
5. Apply character corrections explicitly, and justify each one.
6. Assess dust separately, qualitatively, by source and receptor sensitivity, with the mitigation attached to each source.
7. Carry construction phase effects through as well, using BS 5228 for the build out of the plant itself.

Both strands then land in a Noise Impact Assessment and the air quality work, with a dust management plan prepared separately by the operator or its consultant as a condition document. Our note on standby generator testing and the noise it creates covers the same character correction problem for a different intermittent source.

Hours, routing and servicing

Conditions on a batching plant are usually tighter than on a general industrial unit. Expect limits on operating hours, on delivery and dispatch hours, and often a separate and earlier restriction on tanker deliveries because of the blower noise.

Routing is negotiated rather than imposed, since a planning condition cannot control the public highway beyond the site. The usual mechanism is a routing agreement in a section 106 obligation, backed by a driver instruction and a complaints log. Construction traffic during the build phase is dealt with through a Construction Traffic Management Plan, which the authority will normally require before development begins.

And on a 24 hour operation, deal with the night period head on. A plant batching at 5am for an early concrete pour has a noise case that stands or falls on the night time assessment, and a condition that silently prohibits it is worse than a refusal you can appeal.

The document set for an application

A proportionate submission for a new or extended plant generally runs to a planning statement, the air quality and noise work, a transport assessment or statement with swept path analysis for eight wheel mixers, a drainage strategy covering washout water and silt, a lighting assessment where the yard operates in darkness, and a waste management strategy for returned concrete. Where the site is near housing, a community engagement record is worth submitting whether or not the authority asks for it.

You can see which of those a specific site is likely to need by entering the postcode on PlanScope and answering the guided questions about the operation.

This is general guidance, not legal advice. Assessment methods, air quality objectives and permit requirements change, so confirm the current position with your local planning authority and the environmental health team, and have the technical work prepared by suitably qualified specialists. For specialist technical reports, qualified professional input may be required.

PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.