Adelaide & South Australia

Preliminary Site Investigations (PSI) in Adelaide

Phase 1 Environmental Site Assessments & Site Contamination Investigations for Properties and Developments in Adelaide

Before land is purchased, redeveloped, or rezoned, it is essential to understand what may lie beneath the surface. Our preliminary site investigations and Phase 1 environmental site assessments in Adelaide help identify potential contamination sources early, giving property owners, developers, and consultants the information they need to plan with confidence.

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What Is a Preliminary Site Investigation?

Identifying Potential Contamination Before It Becomes a Problem

A preliminary site investigation (PSI), also known as a Phase 1 environmental site assessment, evaluates the potential for contamination of soil, groundwater, or surface water at a site. It is typically carried out in response to a proposed land purchase, a change in land use, redevelopment, or a planning requirement, and provides an early indication of whether contamination is likely to be present.

The purpose of a preliminary site investigation is to identify potential sources of contamination, assess historical site use, and determine whether further investigation is warranted before development, purchase, or remediation decisions are made.

At BHM Geotechnical, we provide practical environmental investigations through:

  • Preliminary site investigations (PSI)
  • Phase 1 environmental site assessments
  • Site contamination investigations
  • Historical land use reviews
  • Site walkover inspections and preliminary sampling
  • Recommendations for further assessment, where required

Together, these investigations provide information on site history, land use, potential sources of contamination, and whether a Detailed Site Investigation (DSI) may be required.

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

Preliminary Site Investigations & Phase 1 Environmental Site Assessments

Evaluating Historical Land Use and Environmental Risk

Contamination risk rarely comes from a single, obvious source. Historical land use, past industrial or agricultural activity, filling, underground storage, and the influence of neighbouring sites can all affect whether contamination is present. Understanding these factors early is essential when planning a purchase, redevelopment, or further environmental investigation.

01

Preliminary Site Investigation

A preliminary site investigation evaluates the likelihood of contamination based on site history and available information.

Our investigations may include

  • Review of historical land use and title records
  • Examination of aerial photographs and historical site plans
  • Review of previous environmental reports, where available
  • Identification of potentially contaminating activities or land uses
  • Site walkover and visual inspection
  • Assessment of surrounding land uses and influences
  • Identification of data gaps requiring further investigation

These investigations help identify potential contamination risks and determine whether further environmental investigation, such as a Detailed Site Investigation (DSI), may be required.

02

Phase 1 Environmental Site Assessment

A Phase 1 environmental site assessment evaluates the potential sources, nature, and extent of contamination that may affect a site, without necessarily requiring intrusive sampling.

Our investigations may include

  • Desktop review of environmental and planning records
  • Assessment of potential contaminants of concern based on site history
  • Evaluation of soil, groundwater, and surface water risk factors
  • Consideration of applicable regulatory and planning context
  • Development of a preliminary conceptual site model
  • Identification of whether intrusive sampling or a Detailed Site Investigation (DSI) is warranted
  • Practical reporting to support purchase, planning, or development decisions

These assessments establish an informed understanding of environmental risk, helping clients make confident decisions before land acquisition, planning, redevelopment, or further investigation.

03

When Is a Preliminary Site Investigation Required?

Preliminary site investigations are commonly required or recommended for a range of circumstances, particularly where historical land use may present a contamination risk.

Common triggers may include

  • Proposed purchase of commercial, industrial, or historically used land
  • Change of land use or rezoning applications
  • Redevelopment of former industrial or agricultural sites
  • Subdivision or land development approval requirements
  • Planning authority or council conditions
  • Presence of underground fuel or chemical storage, past or present
  • Proximity to known or historically contaminated sites
  • Lender or insurer due diligence requirements

Identifying these triggers early helps determine whether a preliminary site investigation or further environmental assessment is required before proceeding.

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Speak With Adelaide’s Preliminary Site Investigation Specialists

We provide preliminary site investigations, Phase 1 environmental site assessments, and site contamination investigations for residential, commercial, and industrial projects throughout Adelaide and South Australia.

    Why Choose BHM Geotechnical?

    Seasoned Environmental Site Assessment Consultants in Adelaide

    BHM Geotechnical combines practical site experience, environmental engineering expertise, and forensic investigation methods to deliver reliable preliminary site investigations and Phase 1 environmental site assessments.

    From land purchase due diligence to redevelopment planning, our investigations help clients understand the contamination risks that may affect their site.

    Environmental Engineering Expertise

    Investigations led by qualified environmental engineers with experience across contaminated land assessment.

    Independent Technical Assessments

    Objective assessments based on available evidence, site history, and observed conditions.

    Clear, Practical Reporting

    Reports prepared to support owners, developers, consultants, and planning authorities.

    Residential, Commercial & Industrial Experience

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

    Responsive Project Delivery

    Efficient investigations and reporting to support timely purchase, planning, and development decisions.

    Preliminary Site Investigations for Purchase, Planning & Development

    Projects That Commonly Require a Preliminary Site Investigation

    Understanding whether a site may be affected by contamination is often essential before purchase, planning approval, or redevelopment can proceed.

    Our investigations support:

    Pre-Purchase Due Diligence

    Assess potential contamination risk before purchasing land or commercial property.

    Rezoning & Planning Applications

    Provide the environmental information required to support planning and rezoning submissions.

    Redevelopment of Former Industrial Sites

    Investigate historical site use and identify potential contamination sources affecting redevelopment.

    Subdivision & Land Development

    Assess contamination risk as part of subdivision approval and land development planning.

    Lender & Insurer Requirements

    Provide environmental information to support finance, insurance, or transaction due diligence.

    Council & Regulatory Conditions

    Address the preliminary environmental assessment conditions attached to the development consent.

    What Are the Common Signs That a Site May Require Investigation?

    Contamination risk is not always visible. In many cases, a site's history is the strongest indicator of potential contamination, even where no visible signs of impact are present. Former industrial, agricultural, or fuel storage use, filled land, discoloured soil, odours, or nearby known contamination sources can all indicate that a preliminary site investigation may be warranted.

    Recognising these indicators early helps property owners, developers, and consultants determine whether a preliminary site investigation or Phase 1 environmental site assessment is necessary before purchase or development proceeds.

    The Preliminary Site Investigation Process

    How We Assess Potential Site Contamination

    01

    Review of Available Information

    Review historical land use records, title information, aerial photographs, and any previous environmental reports.

    02

    Site Walkover & Inspection

    Inspect the site to identify visible evidence of contamination, filling, or potentially contaminating activities.

    03

    Contamination Risk Assessment

    Assess potential contaminant sources, site history, and surrounding land use influences.

    04

    Data Review & Conceptual Site Model

    Interpret available information to identify data gaps and develop a preliminary understanding of site conditions.

    05

    Preliminary Site Investigation Report

    Prepare a report summarising findings and recommending whether further investigation, such as a Detailed Site Investigation (DSI), is required.

    Why Preliminary Site Investigations Are Important

    Why Early Environmental Due Diligence Matters

    A preliminary site investigation helps determine whether a site is likely to be affected by contamination, and what further steps, if any, may be required before purchase or development.

    Identify Potential Contamination Sources

    Understand the historical land uses and activities that may have affected the site.

    Support Informed Purchase Decisions

    Provide independent environmental information to support due diligence and negotiations.

    Determine Whether Further Investigation Is Needed

    Assess whether a Detailed Site Investigation (DSI) or intrusive sampling is warranted.

    Support Planning & Development Approvals

    Provide information to satisfy the council and planning authority's environmental conditions.

    Protect Against Unexpected Costs

    Identify contamination risks before they affect construction timelines or budgets.

    Improve Confidence in Future Decisions

    Help owners, developers, and consultants understand environmental risk before proceeding.

    Explore Related Environmental & Geotechnical Services

    Related Environmental Services

    Detailed Site Investigations (DSI)

    Where preliminary findings indicate potential contamination, a DSI uses targeted sampling and laboratory testing to define the nature and extent of contamination.

    Remedial Action Plans (RAP)

    Develop practical remediation strategies where contamination has been identified and management or cleanup is required.

    Validation Assessments

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

    Waste Classifications

    Classify excavated materials as waste fill, intermediate waste, or low-level contaminated soil for compliant reuse or disposal.

    Environmental Groundwater Assessments

    Assess groundwater quality and contamination risks where potential impacts extend below the surface.

    Acid Sulfate Soil (ASS) Assessments

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

    Hazardous Materials Surveys

    Identify asbestos, lead-based paint, and other hazardous building materials before demolition or redevelopment.

    Appreciated Across Adelaide for Helping Clients Identify & Mitigate Environmental Risks

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

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    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.
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    Understand the Contamination Risk Before You Proceed

    Our preliminary site investigations and Phase 1 environmental site assessments provide practical information about potential contamination risk, supporting purchase, planning, and development decisions across Adelaide.

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    FAQs

    Frequently Asked Questions

    What is a preliminary site investigation?

    A preliminary site investigation (PSI), also known as a Phase 1 environmental site assessment, is a critical step for property owners and developers. It identifies the risk of soil, groundwater, or surface water contamination by reviewing historical land use, site records, and environmental factors. Conducting a PSI helps ensure compliance with South Australian regulations and supports informed land purchase, redevelopment, or planning decisions.

    What is a Phase 1 environmental site assessment?

    A Phase 1 environmental site assessment in Adelaide is a non-intrusive investigation that uses desktop research, site history, and land use records to identify potential sources of contamination. This assessment is essential for real estate transactions, rezoning, and development applications, providing early insights into environmental risks without the need for soil sampling.

    When is a preliminary site investigation required?

    Preliminary site investigations in Adelaide are typically required for land purchase due diligence, rezoning and planning applications, redevelopment of industrial or agricultural sites, subdivision approvals, and when requested by lenders or insurers. Identifying contamination risk early can prevent costly delays and ensure regulatory compliance.

    Does a preliminary site investigation include soil sampling?

    Not always. Most preliminary site investigations involve a desktop review and site walkover inspection. If the PSI identifies potential contamination, a Detailed Site Investigation (DSI) with soil and groundwater sampling may be recommended for Adelaide sites to confirm risks and determine next steps.

    What happens if contamination is suspected after a preliminary site investigation?

    If a preliminary site investigation uncovers potential contamination, the next step is a Detailed Site Investigation (DSI). This involves targeted soil and groundwater sampling, as well as laboratory testing, to confirm the presence and extent of contamination and to guide appropriate remediation for Adelaide properties.

    Does a preliminary site investigation determine remediation requirements?

    No. A preliminary site investigation (PSI) in Adelaide only assesses the likelihood of contamination and recommends whether further investigation is needed. Remediation plans are developed separately and are based on the results of a Detailed Site Investigation (DSI) and laboratory analysis.

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