PASS Contracts, page-59

This is about the Impact of PASS if disturbed & allowed to oxidise - turning it into AASS. (From the same WA Fact Sheet)

Without proper management, disturbing ASS

can have serious environmental, economic,

engineering and health impacts and can

constrain development, construction and other

activities in affected areas.
Detrimental effects can include:

# ecological damage to aquatic and wetland

ecosystems;

# effects on estuarine fisheries and

aquaculture projects;

# contamination of groundwater with arsenic,

aluminium and heavy metals;

# reduction in agricultural productivity due to

soil degradation;

# damage to infrastructure through the

corrosion of concrete and steel pipes,

bridges and other sub-surface assets; and

# potential threat to human and animal

health