Adelaide & South Australia

Detailed Site Investigations (DSI) in Adelaide

Phase 2 Environmental Site Assessments & Contaminated Land Investigations for Adelaide Properties and Developments

Where a preliminary investigation has identified potential contamination, a detailed site investigation confirms whether contamination is actually present and to what extent. Our detailed site investigations and Phase 2 environmental site assessments in Adelaide provide the sampling, laboratory analysis, and risk assessment needed to support redevelopment, remediation, and regulatory decisions with confidence.

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  • Testing Undertaken by NATA-Accredited Labs

What Is a Detailed Site Investigation?

Confirming the Presence and Extent of Site Contamination

A detailed site investigation (DSI), also known as a Phase 2 environmental site assessment, evaluates the presence, nature, and extent of contamination at a site through intrusive sampling and laboratory analysis. These investigations are typically undertaken following a preliminary site investigation (PSI) that has identified potential sources of contamination or data gaps requiring further characterisation.

The purpose of a detailed site investigation is to confirm whether contamination is present, define its extent, assess the risk it may pose to human health and the environment, and determine whether remediation is required before land use, redevelopment, or transaction can proceed.

At BHM Geotechnical, we provide practical contaminated land investigations through:

  • Detailed site investigations (DSI)
  • Phase 2 environmental site assessments
  • Contaminated land investigations
  • Soil, groundwater, and surface water sampling
  • Laboratory analysis and data interpretation
  • Human health and environmental risk assessment

These investigations provide the technical basis for redevelopment, remediation planning, and regulatory approval where contamination has been identified or suspected.

Our detailed site investigation services support residential, commercial, industrial, and land development projects throughout Adelaide and South Australia.

Detailed Site Investigations & Phase 2 Environmental Site Assessments

Confirming Contamination Through Sampling and Analysis

Where a preliminary assessment has identified potential contamination sources or data gaps, only intrusive investigation and laboratory testing can confirm what is actually present in the soil and groundwater, and whether it poses a risk. This step is essential before remediation, redevelopment, or regulatory sign-off can proceed.

01

Detailed Site Investigation

A detailed site investigation confirms the presence, concentration, and extent of contamination through targeted sampling and analysis.

Our investigations may include

  • Design of a sampling and analytical program based on the conceptual site model
  • Installation of boreholes, test pits, and groundwater monitoring wells
  • Collection of soil, groundwater, and surface water samples
  • Laboratory analysis of samples for identified contaminants of concern
  • Comparison of results against relevant guideline criteria
  • Delineation of the horizontal and vertical extent of contamination
  • Site characterisation to support risk assessment and reporting

These investigations confirm the presence, concentration, and extent of contamination, providing the technical data needed to assess risk and determine whether remediation is required.

02

Phase 2 Environmental Site Assessment

A Phase 2 environmental site assessment applies a structured, risk-based approach to confirm and quantify contamination identified during a preliminary assessment.

Our investigations may include

  • Refinement of the conceptual site model based on intrusive findings
  • Assessment of contaminant migration pathways and receptors
  • Human health and ecological risk assessment
  • Evaluation of potential impacts on groundwater and surrounding land uses
  • Consideration of applicable state and national environmental guidelines
  • Recommendations for remediation, management, or further monitoring
  • Reporting to support regulatory, planning, or transaction requirements

These assessments translate sampling data into a clear understanding of risk, helping clients make informed decisions about remediation, redevelopment, or further monitoring.

03

When Is a Detailed Site Investigation Required?

A detailed site investigation is commonly required or recommended following a preliminary site investigation, or wherever contamination is confirmed or strongly suspected.

Common triggers may include

  • A preliminary site investigation recommending further assessment
  • Confirmed or suspected soil or groundwater contamination
  • Redevelopment of known or historically contaminated land
  • Regulatory or council conditions requiring a detailed contamination assessment
  • Site contamination audit or assessment requirements under South Australian environmental legislation
  • Subdivision or land development involving former industrial sites
  • Remediation planning or validation preparation
  • Legal, insurance, or transaction disputes involving contamination

Identifying these triggers early helps determine whether a detailed site investigation is required before redevelopment, remediation, or approval can proceed.

Get Your Groundwater Assessed

Speak With Adelaide’s Detailed Site Investigation Specialists

We provide detailed site investigations, Phase 2 environmental site assessments, and contaminated land investigations for residential, commercial, and industrial projects throughout Adelaide and South Australia.

    Why Choose BHM Geotechnical?

    Experienced Contaminated Land Investigation Consultants in Adelaide

    BHM Geotechnical combines rigorous sampling methodology, laboratory-backed analysis, and environmental engineering expertise to deliver reliable, detailed site investigations and Phase 2 environmental site assessments.

    From confirming suspected contamination to supporting remediation planning, our investigations give clients a clear technical basis for decision-making.

    Environmental Engineering Expertise

    Investigations led by qualified environmental engineers experienced in contaminated land assessment.

    NATA-Accredited Laboratory Testing

    Soil, groundwater, and surface water samples analysed by NATA-accredited laboratories where required.

    Risk-Based Reporting

    Reports prepared to support risk assessment, remediation planning, and regulatory review.

    Residential, Commercial & Industrial Experience

    Experience across former industrial sites, agricultural land, commercial developments, and residential redevelopment.

    Responsive Project Delivery

    Efficient investigations and reporting to support timely remediation, planning, and transaction decisions.

    Detailed Site Investigations for Remediation, Redevelopment & Compliance

    Circumstances Where Confirming Contamination Matters

    Understanding the actual presence, extent, and risk of contamination is often essential before remediation, redevelopment, or approval can proceed.

    Our investigations support:

    Confirmed or Suspected Contamination

    Confirm the presence, concentration, and extent of contamination identified during a preliminary investigation.

    Redevelopment of Former Industrial Sites

    Characterise contamination affecting sites with a history of industrial, agricultural, or fuel storage use.

    Remediation & Validation Planning

    Provide the technical data needed to design remediation strategies and plan future validation works.

    Regulatory & Planning Approvals

    Support council or environmental authority conditions requiring a detailed contamination assessment.

    Subdivision & Land Development

    Assess contamination as part of subdivision approval for previously used or at-risk land.

    Legal & Transaction Disputes

    Provide an independent technical assessment where contamination affects property transactions or disputes.

    What Are the Common Signs That a Detailed Investigation May Be Needed?

    In many cases, a detailed site investigation follows directly from the findings of a preliminary assessment, rather than from visible on-site signs. Confirmed historical contaminating land uses, data gaps identified during a Phase 1 assessment, discoloured or odorous soil, groundwater impacts, or regulatory conditions attached to development consent can all indicate the need for a detailed site investigation.

    Recognising these indicators early helps property owners, developers, and consultants determine whether a detailed site investigation or Phase 2 environmental site assessment is necessary before proceeding.

    The Detailed Site Investigation Process

    How We Confirm and Characterise Site Contamination

    01

    Review of Preliminary Findings

    Review the preliminary site investigation, conceptual site model, and identified data gaps.

    02

    Sampling & Analytical Program Design

    Design a targeted sampling program based on suspected contaminants and site conditions.

    03

    Intrusive Investigation

    Install boreholes, test pits, and groundwater monitoring wells, and collect soil, groundwater, and surface water samples.

    04

    Laboratory Analysis & Risk Assessment

    Analyse samples in NATA-accredited laboratories and assess results against relevant guideline criteria and risk pathways.

    05

    Detailed Site Investigation Report

    Prepare a report presenting site characterisation, risk assessment findings, and recommendations for remediation or further management.

    Why Detailed Site Investigations Are Important

    Why Is a Detailed (Phase II) Site Investigation Crucial?

    A detailed site investigation provides the technical certainty needed to make informed decisions about remediation, redevelopment, and regulatory compliance.

    Confirm the Presence and Extent of Contamination

    Move beyond preliminary indicators to laboratory-confirmed data on soil and groundwater conditions.

    Support Risk-Based Decision-Making

    Understand the risk contamination may pose to human health and the environment.

    Inform Remediation Planning

    Provide the data required to design effective and appropriately scoped remediation strategies.

    Support Regulatory & Planning Approvals

    Satisfy council and environmental authority requirements for contaminated land assessment.

    Protect Against Unexpected Costs

    Identify the true scope of contamination before it affects project budgets and timelines.

    Improve Confidence in Future Decisions

    Help owners, developers, and consultants proceed with a clear, evidence-based understanding of site risk.

    Explore Related Environmental & Geotechnical Services

    Related Environmental Services

    Preliminary Site Investigations (PSI)

    Desktop and walkover assessments to identify potential contamination sources before intrusive investigation.

    Remedial Action Plans (RAP)

    Develop practical remediation strategies where contamination has been confirmed.

    Validation Assessments

    Confirm that remediation or site management works have achieved the required environmental standards.

    Waste Classifications (ENM/VENM/GSW)

    Classify excavated material for appropriate reuse, treatment, or disposal.

    Acid Sulfate Soil (ASS) Assessments

    Identify and manage acid sulfate soil risks that may affect excavation and redevelopment projects.

    Environment Groundwater Assessments

    Assess groundwater quality and the risk of contamination migration in greater detail.

    Pre-Purchase Due Diligence (Environmental)

    Identify potential environmental constraints before purchasing or redeveloping land.

    Geological Groundwater Assessments

    Investigate subsurface groundwater behaviour relevant to contamination and site development.

    Client Feedback on Our Contaminated Land Investigations in Adelaide

    BHM Geotechnical supports property owners, developers, and consultants with rigorous investigations, clear reporting, and responsive service throughout Adelaide and South Australia.

    We are writing to you to confirm that the matter has now settled. We thank you for your assistance in this matter. Your expertise was instrumental in settling the matter. We confirm that you will not be required to attend Court as earlier anticipated.
    K
    Thanks to your report, the other side made a significant further concession of around 30% from their last offer which the other side was not earlier willing to do.
    I
    Efficient, concise geotechnical engineering advice.
    P
    Replace with a fourth Adelaide client testimonial.
    A

    Confirm the Extent of Contamination Before You Proceed

    Our detailed site investigations and Phase 2 environmental site assessments provide the sampling, analysis, and risk assessment needed to support remediation, redevelopment, and regulatory decisions across Adelaide.

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    FAQs

    Frequently Asked Questions

    What is a detailed site investigation?

    A detailed site investigation (DSI) in Adelaide, also called a Phase 2 environmental site assessment, confirms the presence, concentration, and extent of soil and groundwater contamination through intrusive sampling and accredited laboratory analysis. This investigation is essential after a preliminary site investigation and supports property transactions, redevelopment, and regulatory compliance across South Australia.

    What is a Phase 2 environmental site assessment?

    A Phase 2 environmental site assessment in Adelaide uses a structured, risk-based approach to confirm and quantify site contamination identified during a preliminary assessment. The process analyses contaminant migration pathways, exposure risks, and provides actionable recommendations for property owners, developers, and consultants.

    When is a detailed site investigation required?

    A detailed site investigation in Adelaide is required when a preliminary site investigation recommends further assessment, when soil or groundwater contamination is confirmed or suspected, or when mandated by regulatory, planning, or remediation requirements. Early identification helps avoid costly project delays and ensures compliance with South Australian legislation.

    What does a detailed site investigation involve?

    A detailed site investigation in Adelaide involves installing boreholes or test pits, collecting targeted soil and groundwater samples, and analysing them in NATA-accredited laboratories. The results determine the type, concentration, and spread of contamination, supporting informed property, development, and compliance decisions.

    Does a detailed site investigation include remediation design?

    No. A detailed site investigation (DSI) in Adelaide identifies and characterises contamination, providing recommendations for next steps. If remediation is required, a separate Remedial Action Plan (RAP) is developed based on the DSI results to address site-specific risks and achieve regulatory approval.

    Does a detailed site investigation guarantee regulatory approval?

    No. While a detailed site investigation (DSI) in Adelaide delivers a comprehensive technical assessment of site contamination, regulatory approval is granted separately by the relevant authority. The DSI provides essential data, but approval depends on site-specific results and meeting all South Australian compliance requirements.

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