The National Environment Standards have guidelines on what are considered safe levels of a range of toxins including lead. Worksafe and Ecan issue fines of up to $50,000 if you have knowingly moved contaminated soil.
Mark Fleming at Oceania Environmental is the soil sampling expert. He will organise a soil contamination test, write the report and if required, arrange for contaminated land remediation. Mark can also certify soil and provide a certificate - if it’s clear - so your soil will be accepted at waste depots.