Environmental Protection (Concrete Batching and Cement Product Manufacturing) Regulations 1998

An operator must ensure that —

all water draining off any area where agitators, mixers or moulds are loaded or where concrete is batched drains into a slurry pit;

all water used to wash out agitators, mixers or moulds or to clean up spilt material drains into a slurry pit;

all other water draining off sealed or paved areas of the premises and which is likely to contain waste material drains into a slurry pit or settling pond; and

any water removed from, or which might overflow from, a slurry pit drains into a settling pond.

An operator must ensure that no water used in concrete batching or cement product manufacturing is discharged from the premises until —

it has been —

through a silt trap; or

contained in a settling pond for long enough to allow all particulate matter to settle out;

if the water is likely to contain hydrocarbons, it has been through an oil interceptor.