Category C/C3
Category C/C3

Category C/C3 (Galvanised Steel- Water Borne)

Category C: Medium. This category mainly covers coastal areas with low salinity. The extent of the affected area varies significantly with factors such as wind, topography and vegetation. Around sheltered areas, such as Port Phillip Bay, Category C extends beyond about 50 metres from the shoreline to a distance of about one kilometre inland. For a sheltered bay or gulf, such as near Adelaide, this category extends from the shoreline to about 3 to 6 kilometres inland. Along ocean front areas with breaking surf and significant salt spray, it extends from about 1 kilometre inland to between 10 to 50 kilometres inland, depending on the strength of prevailing winds and topography.

Much of the metropolitan areas of Wollongong, Sydney, Newcastle, the Gold Coast, Auckland and Wellington are in this category.

In South Australia, the whole of Yorke Peninsula falls within this or a more severe category, and in the south-east of the state, from Victor Harbor to the Victorian border, this category extends between 30 and 70 kilometres inland. Such regions are also found in urban and industrial areas with low pollution levels and although uncommon in Australia and New Zealand, exist for several kilometres around major industries, such as smelters and steelworks, and in the geothermal areas of New Zealand.

Micro-environmental effects, such as those resulting from proximity to airports and sewage treatment works, may also place a site into this category. Interior environments with Category C corrosivity can occur in humid production rooms, such as food-processing.