Sediment Assessment & Remediation

Science that Drives Solutions

Contaminated sediment projects are complex and require multi-disciplinary teams to identify potential contaminant sources, understand contaminant fate and transport, assess human health and ecological risks, and develop risk-based remedial designs and remedial outcomes that protect human health and the environment.

The complexity of regulations, legal requirements, and interest from public and agency stakeholders increase the potential cost implications of poorly conceived and implemented strategies. At EHS Support, we define success not just by agency approval of the final remedy but by also balancing stakeholder outcomes with the financial impact on performing parties.

Holistic Assessments, Practical Solutions

We conduct holistic assessments to support practical and effective sediment remedial solutions. Using existing and newly acquired data, we develop robust conceptual site models (CSM) to understand nature and extent, fate and transport, and risks associated with contaminants of concern in dynamic sediment environments.

Our investigations are focused on addressing material uncertainties that impact confident remedial decision-making and drive remedial costs. We evaluate a variety of remedial alternatives, including dredging, capping, in situ treatment/amendments, and monitored natural recovery, and we advocate for timely and cost-effective alternatives that control contaminant sources and achieve long-term protection of human health and the environment.

A Dedicated & Knowledgeable Team

EHS Support provides comprehensive multi-disciplinary expertise throughout each phase of the sediment assessment and remediation project life cycle. We have extensive experience conducting sediment assessment and remediation projects at marine, estuarine, riverine, and lacustrine sites regulated under state and federal programs within Australia, the United States, and other countries. Our team has worked with various clients and project requirements at these sites, gaining experience with a range of contaminants of concern, physical settings, environmental impacts, and regulatory programs. We apply this depth of experience to the unique challenges presented by each new project.

An energetic team that’s focused on delivering the right outcomes for clients — that’s EHS Support.

For more information, contact Lemuel Cabahug or Gary Long.

Our Project Experience

Magazine Creek Contamination and Acid Sulfate Soil Investigation 2024

Magazine Creek Contamination and Acid Sulfate Soil Investigation 2024

EHS Support provided a detailed site investigation; waste soil classification; acid sulfate soil investigation.
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Surface Water, Sediment & Soil Criteria Development – Natural Gas Supplier, Queensland, Australia

Surface Water, Sediment & Soil Criteria Development – Natural Gas Supplier, Queensland, Australia

EHS Support completed a study to define the treatment requirements for boron in produced water, considering both the potential impact of boron on aquatic and benthic organisms within the river, as well as impacts on plant growth and livestock from use as irrigation water or uptake by vegetation and use as livestock feed.
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Investigation Design & Implementation

Investigation Design & Implementation

Designing and implementing efficient sediment investigation programs that reduce uncertainty and allow for confident decision making requires a robust conceptual site model and clear data-quality objectives. Specialised equipment, collection techniques and field strategies are a must. Our comprehensive services include both low- and high-resolution core sampling, thermal imaging surveys, bioavailability assessments, pore water sampling, biological tissue sampling and sediment quality triad (SQT) studies.

Remedy Selection, Design, & Implementation

Remedy Selection, Design, & Implementation

We understand that defining goals based on chemistry, bioavailability and site-specific risks to relevant receptors is critical to successful, cost-effective sediment remediation. That’s why our scientists and engineers are focused on developing site-specific, risk-based criteria that can be integrated into practical, protective and appropriately scaled remedial strategies that lead to regulatory closure.

Source Identification & Allocation

Source Identification & Allocation

For multi-party sites, it’s vital to allocate costs and develop a position of support. This is especially true at sediment mega-sites, where investigation, remediation, oversight and natural resource damage costs can be high. Early involvement in the investigation and assessment program can impact future assessments, so strategies must be developed early and evolve. Our experts understand this and develop scientifically robust and compelling arguments for source identification and allocation.