Hunter Geotechnical Services offers Detailed Site Investigations (DSI) to thoroughly assess and manage site contamination.
Detailed Site Investigation (DSI)
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Hunter Geotechnical Services offers Detailed Site Investigations (DSI) to thoroughly assess and manage site contamination.
A Detailed Site Investigation (DSI) is a crucial step in understanding the extent and nature of contamination on a site. Typically conducted following a Preliminary Site Investigation (PSI), a DSI involves comprehensive sampling, testing, and analysis to determine the levels of contamination present in soil, groundwater, and other affected media. This investigation ensures that any potential risks to human health and the environment are fully identified and understood, allowing for the development of a tailored remediation plan.
At Hunter Geotechnical Services, we provide expert DSI services across Newcastle, Lake Macquarie, the Hunter Valley, the Mid-North Coast, and throughout NSW. Our experienced team uses advanced techniques to accurately delineate contamination and assess its impact, ensuring compliance with all relevant regulatory requirements. Whether your project involves residential, commercial, or industrial development, our DSI services offer the detailed insights you need to make informed decisions and move forward with confidence.
Overview of Detailed Site Investigations (DSI)
A Detailed Site Investigation (DSI), also referred to as a Phase 2 Investigation, is undertaken when potential or actual contamination has been identified. A DSI builds on the findings of a PSI, providing a more in-depth analysis, in accordance with industry standard practice and regulations, to determine the extent and nature of contamination at a site.
Key Components of a DSI
- Sampling and Testing
The DSI involves extensive sampling and testing across the site. Samples are collected from various media, including soil, groundwater, surface water, and ground gas vapour. These samples are then analysed to determine the type, concentration, and distribution of contaminants. - Conceptual Site Model (CSM)
The DSI includes a risk assessment to evaluate the potential risks to human health and the environment posed by the identified contaminants. This assessment is crucial for understanding the severity of contamination and guiding the development of management strategies. - Delineation of Contamination
A critical component of the DSI is delineating the contamination both laterally and vertically. This ensures that the full extent of contamination is understood, which is essential for effective remediation planning. - Reporting and Recommendations
After the sampling and testing, a detailed report is prepared. This report outlines the findings, including the extent and nature of contamination. Based on these findings, the report provides recommendations for remediation or further investigation.
Purpose of a DSI
The primary purpose of a DSI is to provide the necessary data to develop a Remediation Action Plan (RAP) if significant contamination is identified. The DSI ensures that all potential risks are understood and that the site can be managed or remediated effectively to meet regulatory requirements.
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Frequently Asked Questions
1. What is the difference between a PSI and a DSI?
A PSI is a preliminary assessment that identifies potential contamination through a desktop study and site inspection, with limited sampling if necessary. A DSI, on the other hand, involves more extensive sampling and testing to determine the exact extent and nature of the contamination, providing the data needed for remediation.
2. Do I need both a PSI and a DSI?
In many cases, a PSI is the first step. If the PSI identifies potential or actual contamination, a DSI is usually required to fully assess the situation and develop a remediation plan.
3. Can an ESA replace a PSI?
Yes, in some cases, an Environmental Site Assessment (ESA) can replace a PSI, depending on the site’s specifics and the regulatory requirements. Hunter Geotechnical Services can advise on whether an ESA is suitable for your site.
4. What regulations and standards govern PSIs and DSIs?
PSIs and DSIs are governed by various Australian standards and regulations, including the National Environment Protection (Assessment of Site Contamination) Measure (NEPM) and the State Environmental Planning Policy (Resilience and Hazards) 2021. Compliance with these standards is essential for any site investigation.
Contact Us Today About Your Detailed Site Investigation
Hunter Geotechnical Services offer contaminated land site investigation services throughout Newcastle, Lake Macquarie, the Hunter Valley, Mid-North Coast and across NSW. Speak to an expert about your DSI needs. Call us today or complete this form with your details and we’ll contact you shortly.
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