Coastal and Marine Pollution

Code of Practice for Antifouling

Australian and New Zealand Environment and Conservation Council, 2000

Maintenance

In general maintenance of small and large vessels should be conducted at an appropriate facility, either above the tidal zone or in a dry dock. The hulls of vessels pose a number of risks to the local environment including the release of toxic chemicals from antifouling paints and the release of exotic species that may have fouled the hull. With respect to exotic species, in particular, large vessels (>25m) should be maintained out of the water, whenever possible.

• In-water cleaning of hulls may be permitted in some localities. Consult the relevant State agency and ensure containment of all wastes.

• Cleaning of sea chests, sea suction grids and other hull apertures may be permitted (in Victoria) providing that any debris removed is not allowed to pass into the water column or fall to the sea bed (debris includes all organisms which may be attached). Vessel operators should consult the relevant State agency.

• Polishing of propellers may also be permitted, if vessels are greater than 200t. The relevant agency should be consulted.

The water blasting, particularly of large vessels (>25m) with self-polishing co-polymer painted hulls is used to remove the hydrolysed layer as well as slimes and light fouling prior to repainting. This process can generate coloured waste water. Coloured run off should be avoided and, where practical, water should be recollected for recycling or released to sewer (with approval of sewerage authorities).