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Land contaminated with hazardous substances
such as heavy metals (eg; lead and arsenic), pesticides and hydrocarbons
may pose a risk to human health and the environment.
Land contamination can occur as a result of poor environmental management
and waste disposal practices, use of contaminated fill to reclaim
or level the site, leaking underground storage tanks and accidental
spills in industrial, agricultural or commercial activities.
There are specific industries and common land uses which have been
associated with site contamination. Some of the activities include:
service stations, chemical plants, tanneries, cattle dips, fuel
and oil storage, foundries and landfills.
Contaminated Land Management legislation and guidelines place obligations
upon local governments, owners and occupiers relating to the identification,
notification and management of contaminated land.
Contaminated site assessments are generally undertaken for the following
reasons:
Change in the land use (eg; from industrial to residential)
Property transactions
Conformance with notices or orders by government authorities
(eg; EPA) or the courts
Due diligence purposes.
The typical staged approach of Contaminated Site Investigations
and Management is:
STAGE 1 PRELIMINARY SITE ASSESSMENT
Essentially involves a walk-over inspection
of the site, interviews with relevant parties such as site management,
owners and government authorities, review of site history and records
and sometimes limited soil sampling.
This assessment indicates whether there is a risk of contamination
at the site, the potential contaminants and possible locations of
the contaminants and whether a more detailed investigation (Stage
2) is required.
STAGE 2 DETAILED SITE ASSESSMENT
This assessment involves a comprehensive
soil (and groundwater) sampling program to establish the extent of contamination for the range of potential contaminants
identified in Stage 1.
This assessment report indicates whether
the level of contamination is within acceptable criteria, remediation
or management is required and assesses the risks posed by the contamination.
STAGE 3 REMEDIAL ACTION PLAN (RAP)
The RAP details the site remediation strategies,
contaminated area(s), treatment or off-site disposal details, validation
of remediated areas and imported fill, environmental management
controls and health & safety plans for the remediation project.
STAGE 4 SITE REMEDIATION
Site remediation involves the implementation
of the RAP, which should be project managed and monitored by experienced
and competent persons.
STAGE 5 VALIDATION
The validation report presents the results
of the validation sampling which demonstrates that the remediation
has been completed.
SERVICES & EXPERIENCE
The Hibbs & Associates Pty Ltd personnel
are highly qualified and experienced to provide the following services
associated with contaminated sites:
Site contamination assessments
Preparation of remedial action plans (RAP) and site management plans
Validation sampling and reporting
Remediation project management
Advice on remediation technology
Environmental air, noise and water monitoring
For further information regarding contaminated site assessments
and management, please contact:
Philip Hibbs on 0418 356 784, or
Simon Butterfield on 0419 403 543
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