New South Wales DECCW Audit System
Western Australia Audit System
Environmental Management Systems (EMS) Auditing
Engineering Management & Dangerous Goods Audits
Contaminated sites audits can be required by legislation (statutory audits) for redevelopment or rectification and/ or management of spills.
Contaminated sites audits has become the most reliable method of ensuring compliance in developing contaminated sites in all of Australia. With South Australia in 2009 becoming the most recent addition to states accrediting or appointing site auditors, all states and territories now recognize the role and position.
The collective aims of the contaminated sites auditing rationale is to provide a means for providing confidence in ensuring protection of human health and the environment from pollutants. The various audit systems adopted by the states and territories provide a somewhat even basis for development of contaminated sites, using consultants, auditors, planning departments, local and state government to ensure assessment and remediation methods are appropriate for the situation. 
Prospective property owners, current property owners, businesses, financial institutions and government all can benefit from use of the various states audit systems.
Common land uses which can cause contamination requiring investigations and audits include service stations, cattle dips, tanneries, wood treatment sites, landfills, fuel storage, industrial facilities and refuse tips.
Contaminated site audits are performed for many reasons, including:
- Change of land use (development opportunities);
- Response to a regulator notice (leaks, spills, license violations);
- In compliance with an voluntary assessment or remediation agreement (with the government);
- Migration of contaminants off the subject site; and
- Due diligence.
The auditor plays an important role in ensuring appropriate guidelines are followed. Done properly, audited sites can be the most effective and protective means for site development projects.
Each state has its own system of contaminated sites auditing, with Victoria leading the way in 1990 being the first to develop an audit system.
OTEK auditors work to the highest standards, with statutory approved Audits to legislative recognised levels. OTEK 
contaminated site/land auditors are recognised in all states and territories.
They are able to provide the definitive technical review, with Certificates or Statements of Audits required for a property ‘change of use’ in the various jurisdictions.
OTEK auditors have specialised and proven auditing capabilities. Their decisions have a significant potential impact on public health and/or the environment. To this end, site auditors are considered to be the top level of contaminated land practitioners in the country.
There exist specific requirements and guidelines for statutory site audits 
(and other non-statutory site audits) by which the site auditor must abide, including notification, adherence to applicable laws and guidelines and independence. Failure to comply with the legal requirements as a site auditor can result in significant monetary fines to the site auditor.
OTEK has site auditors capable of performing statutory site audits.
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