8310 Guide Concrete
8310 Guide Concrete
8310 Guide Concrete
Concrete batching
Updated March 20161
EPA 427/16: This guideline provides information to those involved in the management and operation of concrete batching
plants, to assist with compliance with the Environment Protection Act 1993. Concrete batching plants are defined as
works for the production of concrete or concrete products that are manufactured by mixing cement, sand, rock (metal),
aggregate or similar materials.
Concrete batching is a prescribed activity of environmental significance under Schedule 1 of the EP Act; these activities
require an authorisation in the form of a licence. Plants with a total capacity of less than 0.5 m3 of concrete product per
production cycle do not require an EPA licence, however the information contained in this guideline is applicable to both
licensed and non-licensed plants.
Environment protection legislation also includes Environment Protection Policies (EPP), which outline recommendations
and mandatory requirements for the protection of a particular aspect of the environment, such as air quality.
Separation distances
The EPA publication, Guidelines for separation distances (2007), sets out the recommended separation distances from
houses or other sensitive land uses, and should be used by planning authorities, developers, planning consultants and
the community as a tool in the development application processes for new or expanding developments. The
recommended separation distances contained in these guidelines are based on the assumption that ‘best available
technology economically achievable’ (BATEA) is implemented. Buffers or separation distances should not be used as an
alternative to source control and cleaner production methods.
The EPA recommends a minimum separation distance from housing or other activities of 100 metres. Site-specific
circumstances (e.g. local topography, state-of-the-art technology) may indicate a reason for amending the recommended
separation distance. For further information please refer to Guidelines for separation distances on the EPA website.
If a mobile batch plant is used for the preparation of concrete, the plant must not be positioned closer than 50 metres to
an environmentally sensitive location. In addition, where possible a buffer zone of 100 metres from any township,
municipality or residential dwelling should be provided when batching concrete.
Regulation of air pollution is primarily governed through the Environment Protection (Air Quality) Policy 1994 (Air Policy).
Section 4 of the Air Policy requires that the best practicable means of control be used to minimise air pollution from an
activity.
The Air Policy also specifies maximum pollution levels in the Schedule to the policy. The maximum level of concentration
of solid particles, at testing points determined in accordance with this policy, is a total mass of 250 mg/m 3 of residual
gases after completion of the process and before amalgamation with air, smoke or other gases.
Operators of industrial premises must take all reasonable and practicable measures to minimise air quality impacts from
their operations.
In the case of concrete batching plants, cement, sand and aggregates can produce dust which may enter neighbouring
premises and adversely affect amenity value. The best way to avoid offsite problems is to prevent the release of the dust
through good design and management techniques. The provision of natural or artificial wind barriers such as trees,
fences and landforms may help control the emission of dust from the plant.
The most effective means of reducing dust emissions at batching plants is to hard-surface roadways and any other areas
where there is a regular movement of vehicles. Access and exit routes for heavy transport vehicles should be planned to
minimise noise and dust impacts on the environment and amenity of the locality. Where it is not practicable to hard-
surface a site (e.g. at a short-term location), there are a number of alternatives to suppress dust emissions from unsealed
yards and roadways, including:
armouring (a thin layer of high quality pavement material is placed on the pavement surface)
Dust emissions due to vehicles can be minimised by reducing travel distances within the site by appropriate site layout
and design, the use of wheel and truck wash facilities at site exits, and the introduction of vehicle speed limits. All
concrete batching plant sites should demonstrate good maintenance practices, including regular sweeping to prevent
dust build-up.
Fugitive dust
The prevailing wind direction should be considered to ensure that bunkers and conveyors are sited in a leeward position
to minimise the effects of the wind. Aggregate material should be delivered in a damp condition, and water sprays or a
dust suppression agent should be correctly applied to reduce dust emissions and reduce water usage.
Aggregate stored on site in stockpiles should be contained within three-sided storage bunkers with windshields that
project 0.5 metre above the bunker wall. Drive-over in-ground aggregate storage bins should be shielded on at least two
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sides to 0.5 metre high for the full length and width of the bin. Where overhead aggregate storage bins are not totally
enclosed, aggregate should not be loaded within 0.5 metre of the top of the walls.
Conveyors must be designed and constructed to prevent fugitive dust emissions. This may include covering the conveyor
with a roof, installing side protection barriers and equipping the conveyor with spill trays, which direct material to a
collection point. Belt cleaning devices at the conveyor head may also assist to reduce spillage.
Mixer loading areas should be roofed and enclosed on either two (drive-through) or three sides. Water sprays and a
robust curtain of suitable design, or an effective air extraction and filtration system, should be installed to suppress dust
generated during mixer truck loading. Weigh bins and hoppers should be enclosed on three sides and roofed where a
front-end loader is used. The roof should extend 2 metres in front of the bin.
Any raw material spills should be removed promptly by dry sweeping. Water should not be used in the process of
cleaning up spills except where the area drains to a wastewater collection point where washing down would be preferable
to generating dust by sweeping.
Fabric filters
An approved fabric filter incorporating a fabric-cleaning device should be installed on each cement storage silo. The
quality of the filter media and the design characteristics of the filter system must be capable of ensuring that the
maximum concentration of solid particles in residual gases does not exceed 100 mg/m3.
Fabric filters should be serviced and maintained in accordance with the manufacturer’s recommendations. Adequate
access to the filters should be provided to allow for regular inspection and maintenance. A pollution control equipment
register (PCER) should be used to record, on a weekly basis, the following:
pressure drop
To prevent overfill and subsequent filter damage, storage silos should be fitted with high-level audible and visual alarms
in addition to an automatic delivery shut-down. These alarms must have a test circuit and be tested regularly and
documented in the PCER. Every alarm apparatus must be maintained in working order at all times.
Water management
Environment Protection (Water Quality) Policy 2015
The Environment Protection (Water Quality) Policy 2015 (Water Quality Policy) applies to all inland surface and ground
waters, and marine waters.
Clause 20 of the Water Quality Policy lists specific obligations relating to concrete batching plants. Operators must
ensure that;
a) Waste generated at the premises is not discharged into any waters or onto land in a place from which it is reasonably
likely to enter any waters (including by processes such as seepage or infiltration or carriage by wind, rain, sea spray or
stormwater or by the rising of the water table);
(c) the system is effectively operating in respect of any wastewater generated at the premises while the premises are
being used for the works.
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Water considerations
Potential pollutants in batching plant wastewater and stormwater include cement, sand, aggregates, chemical
admixtures, fuels and lubricants. The site should be designed and constructed such that clean stormwater, including roof
runoff, is diverted away from contaminated areas and directed to the stormwater discharge system. Any liquids stored on
site, including admixtures, fuels and lubricants, should be stored in accordance with EPA Guideline, Bunding and spill
management (2007). Underground storage tanks should be tested annually for integrity.
Contaminated stormwater and process wastewater should be captured and recycled. Concrete agitator bowls and chutes
must never be washed out to the stormwater system or roadways. A wastewater collection and recycling system should
be designed to collect contaminated water from:
agitator washout
truck washing
yard washdown
contaminated stormwater
slump stand
Process wastewater and contaminated stormwater collected from the entire site should be diverted to a settling pond, or
series of ponds, such that the water can be reused in the concrete batching process. The settling pond or series of ponds
should be lined with an impervious liner capable of containing all contaminants found within the water they are designed
to collect.
In general a high standard of yard and equipment maintenance will considerably reduce the potential for discharge of
sediment to the wastewater collection and recycling system.
Stormwater management
Uncontaminated stormwater from building roofs, roads and other paved areas, etc, may be separated from the
wastewater collection system and directed through a suitable interceptor or sediment collection system. This system
should be designed and installed to ensure that only clean stormwater is discharged from the site. Regular inspection and
maintenance of the system is necessary to avoid discharges of contaminated water from the site. These inspections and
maintenance should be recorded in the PCER.
Areas where spills of oils and chemicals may occur should be equipped with easily accessible spill control kits to assist in
prompt and effective spill control, according to the EPA Guideline - Bunding and Spill Management (2007). Staff should
be familiar with spill response and notification procedures.
Noise management
Environment Protection (Noise) Policy 2007
The Environment Protection (Noise) Policy 2007 (Noise Policy) provides guidance on noise levels that may be deemed
excessive under the EP Act. It should be noted that the Act requires site-specific issues be taken into account when
determining noise levels that may be excessive.
It is important to ensure that all practicable steps are taken to minimise the adverse effect that noise emissions may have
on the amenity value of an area. This responsibility includes not only the noise emitted from the plant and equipment but
also associated noise sources, such as radios, loudspeakers and alarms.
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Concrete batching
Noise considerations
Commercial and industrial premises must not allow excessive noise to be emitted from the premises. The EPA may issue
an Environment Protection Order (EPO) requiring that the excessive noise be curtailed within a specified period.
Waste management
The main solid waste generated by batching plants is waste concrete. Waste minimisation is the preferred approach to
dealing with this material. Where possible, waste concrete should be used for construction purposes at the batching plant
or project site (e.g. bunker blocks or paving unsealed areas). Alternatively, waste concrete can be directed to a suitable
washout pit where it becomes gravel, sand and sludge, which can subsequently be collected and reused.
Environmental audits
An environmental audit should be conducted annually to ensure that the plant is operating according to its environmental
objectives and within legislative requirements. Implementing environmental complaint procedures and training staff to
recognise and minimise environmental hazards are also good ways of achieving high standards of environmental
compliance through continuous improvement. There may be benefits in providing integrated quality, safety and
environmental management systems for the site, plant operation and delivery process.
Disclaimer
This publication is a guide only and does not necessarily provide adequate information in relation to every situation. This
publication seeks to explain your possible obligations in a helpful and accessible way. In doing so, however, some detail
may not be captured. It is important, therefore, that you seek information from the EPA itself regarding your possible
obligations and, where appropriate, that you seek your own legal advice.
Further information
Legislation
Online legislation is freely available. Copies of legislation are available for purchase from:
Telephone: 13 23 24
Facsimile: (08) 8204 1909
Website: shop.service.sa.gov.au
Email: ServiceSAcustomerservice@sa.gov.au
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Concrete batching
General information