Contaminated soil in NZ refers to soil containing harmful substances, such as heavy metals, pesticides, petroleum products or other chemicals that can potentially pose a danger to human health and the environment. Contamination often arises from various factors including industrial activities; agricultural practices - especially those involving pest control techniques involving contaminating agents like insecticides; accidental spills or leaching incidents. 

For More Info:- https://theagency.org.nz/bulk-works/