
As part of environmental assessments, Preliminary Site Investigations (PSI) and Detailed Site Investigations (DSI) play important roles in evaluating and managing contaminated land. These investigations are indispensable steps in understanding the environmental health of a site, assessing potential risks, and formulating effective remediation strategies.
Preliminary Site Investigations are typically the initial step, conducted to identify and assess potential environmental risks associated with a site. They are often a regulatory requirement during the early stages of land development or prior to property transactions. On the other hand, Detailed Site Investigations follow if further in-depth analysis is warranted, aiming to provide a comprehensive understanding of the extent and nature of contamination.
In the early stages of environmental due diligence, Preliminary Site Investigations act as a crucial precursor to comprehensive assessments. These investigations serve the purpose of identifying potential environmental hazards, gauging contamination risks, and providing an initial overview of the site's environmental health.
At Nova Group Pacific, our Preliminary Site Investigation services are tailored to meet the unique needs of each project. We offer:

As a more comprehensive phase following Preliminary Site Investigations, Detailed Site Investigations delve deeper into the intricacies of site contamination. Detailed Site Investigations are undertaken when the findings from a Preliminary Site Investigation indicate the need for a more thorough understanding of the nature, extent, and potential risks associated with contaminants.
Our Detailed Site Investigation services are designed to provide clients with a comprehensive understanding of environmental risks. We offer:
By combining expertise, advanced technology, and a commitment to environmental stewardship, Nova Group Pacific delivers unparalleled Detailed Site Investigation services, empowering clients to make informed decisions about their projects.
Our specialists are ready to guide you through every stage of your project—from initial assessment to final execution. Get expert advice that ensures safety, efficiency, and long-term performance.
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Our FAQs are designed to provide clear, concise answers to common questions, helping you better understand our approach, services, and how we support projects from initial assessment through to delivery.
A preliminary site visit serves as the initial step in understanding the environmental conditions of a site. The primary purpose is to identify potential environmental risks and contaminants. During this phase, a physical walkover of the site is conducted, historical records are analysed, and initial soil and groundwater samples may be taken. The goal is to provide a broad overview of the site's environmental health, helping stakeholders determine the necessity for further, more detailed investigations.
The main distinction lies in the depth and scope of the assessment. Preliminary Site Investigations (PSI) are a broad examination aimed at identifying potential contamination risks. In contrast, Detailed Site Investigations (DSI) are more extensive and involve in-depth analysis, advanced sampling, and comprehensive laboratory testing. While PSI provides an initial snapshot of environmental conditions, DSI offers a detailed understanding of the nature, extent, and potential risks associated with contaminants, enabling informed decision-making and tailored remediation strategies.
A Detailed Site Investigation (DSI) serves the purpose of providing a comprehensive understanding of environmental risks. It involves advanced sampling, in-depth laboratory analysis, and detailed risk assessments. The goal is to identify specific contaminants, their concentrations, and potential impacts on the site. This information is crucial for the development of targeted and effective remediation strategies, ensuring that any environmental challenges are addressed in a thorough and sustainable manner.
Whether you're early-stage or ready to build, this tool helps you work out what reports you need — and how to bundle them into a single site visit.
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