Site Cleanup and Risk Assessment Services
Contaminated Site Cleanup
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Advise clients in discussions with the Washington State Department of Ecology and help identify environmental concerns about the site and the expectations to address them.
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Develop project management plans, milestones, and schedules.
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Identify data needs and objectives for remedial investigations and create quality assurance project plans, work plans, and health and safety plans.
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Safely manage field investigations and sampling of contaminated media.
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Validate and manage analytical chemistry and global positioning system (GIS) data.
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Prepare remedial investigation (RI), feasibility study (FS) and cleanup action plan (CAP) reports.
Environmental Risk Assessment
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Identify screening levels, contaminants of concern, and remediation levels.
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Present site data using Geographic Information System (GIS) computer tools.
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Develop conceptual models of site features, contaminant conditions, and exposures to media under current and future scenarios.
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Validate scenarios where exposure to contaminants is acceptable for people or ecological receptors using statistical analysis and modeling.
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Make conclusions about regulatory compliance using accurate lines-of-evidence with clearly defined uncertainties.
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​Perform net environmental benefit analysis (NEBA) of no action cleanup alternatives.
Toxicology and Bioassessment
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Apply Ecology's Sediment Management Standards (SMS) for contamination of shoreline and Washington State Department of Natural Resources aquatic land lease areas.
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Determine if contaminants in medial (e.g., soil, sediment, or water) are available for uptake by people, fish, or wildlife.
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Develop site-specific cleanup levels for contaminated media.
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Use benthic ecology studies and toxicity testing to determine if the aquatic life is impaired by contaminated sediment or other stressors.
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Conduct upland studies using Ecology's terrestrial ecological evaluation (TEE) methodology.
Project Examples
Below are three recent examples of work on MTCA contaminated site cleanup projects .
More information about my project experience can be found on the About page.
Silver Bay Logging RI/FS
Project Manager
Seattle Public Utilities
Seattle, Washington
2021 to 2025
Proposal lead and senior scientist for an RI/FS of the former Independent Metals site, which is located along the Lower Duwamish Waterway Superfund Site. The property has been acquired by the City of Seattle for a water quality improvement facility. The Final RI/FS Workplan was approved by Ecology in 2024. Upland soil investigation and initial rounds of groundwater sampling have been completed and reporting is currently in progress by Floyd|Snider.
Camp Kilworth Cleanup Action Plan
Project Manager
Forterra
Federal Way, Washington
2023
Proposal lead and senior scientist that prepared a net environmental benefit analysis (NEBA) and terrestrial ecological evaluation (TEE) as part of a a cleanup action plan at a historic youth camp on a forested property being upgraded for the YMCA. The site is in the footprint of the Tacoma Smelter Plume (TSP). The work was done under the Washington state MTCA Volunteer Cleanup Program, using TSP model remedies. Close coordination with Ecology by Dan Hennessy and the Floyd|Snider geologist, including a working site visit, was instrumental in meeting the project goals.
Environmental Risk Assessment
Task Manager
Minnesota Dakota Utilities/Cascade Natural Gas Company
Bremerton, Washington
2013 to 2021
Managed baseline human health and ecological risk assessments for the RI/FS of the Bremerton Gas Works Site where a manufactured gas plant (MGP) was located adjacent to the Puget Sound. The site was a MTCA site that was upgraded to a Superfund site. Led a team of scientists writing work plan documents, identifying chemicals of potential concern, and performing the risk assessments. Human health scenarios included residential, commercial and construction worker exposures to upland soil, ground water, and vapor. Upland ecological receptors exposed to soil included plants, soil biota, small mammals and birds. Shoreline and aquatic areas included human health scenarios for child beach play and subsistence shellfish gathering. Ecological scenarios were developed for aquatic-dependent wildlife, fish, and the benthic community. Work by Anchor QEA is ongoing.
How to Work with Hennessy Consulting LLC :
The site cleanup consulting services outlined above are for forward-thinking shoreline landowners that want future uses of their contaminated property to be protective of people and the environment. The services are based on information needed to complete a site cleanup under Washington's cleanup laws and adopted rules, the Model Toxics Control Act (MTCA) and Sediment Management Standards. ​
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Our goal is to help you to do the right thing, address your liability for environmental contamination, and allow your property to be used as desired. Whether you are just starting a site clean-up, or have already met with the Ecology, we can help you navigate the process and form a team to complete your project. Start here:
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Contact us to set up a teleconference or in-person meeting to learn about you, the site, and your desired future uses for the property. We will begin to identify the likely issues and uncertainties that would be addressed under a MTCA cleanup and the key milestones for the project such as Ecology approval of work plans, data reports, and remedial investigations.
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After our first meeting, we will provide a proposal and scope of work that may included tasks to gather and review available site information, identify key teaming partners like a registered geologist, visit the site, or draft a project plan with details about likely tasks and anticipated schedule.
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After your approval of the scope of work, we would move forward beginning with a kick off meeting to start the project. After completion of the scope, we would identify next steps as needed.
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