Human Health and Ecological Risk Assessment

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Trihydro has been involved in human health risk assessments (HHRAs) and ecological risk assessments (ERAs) for nearly three decades. With a diverse client base, which includes private and public entities in a variety of industries across North America, Trihydro has developed risk assessment experience with numerous state programs and United States Environmental Protection Agency (EPA) regions on a variety of project types.

Today, virtually every corrective action project we work on (Resource Conservation and Recovery Act [RCRA], Leaking and Aboveground and Underground Storage Tank [LAUST], Comprehensive Environmental Cleanup and Responsibility Act [CECRA], Comprehensive Environmental Response, Compensation, and Liability Act [CERCLA], Voluntary Cleanup Program [VCP], Abandoned Mine Lands [AML], etc.) has a risk assessment component.

HHRA AND ERA SERVICES

Services

Within the realm of risk assessments for contaminated sites, Trihydro has extensive experience with the following:

  • Risk assessment during site strategy development, remedial action, and in brownfields redevelopment
  • Conceptual site exposure models
  • Site-specific risk assessments and developing site-specific cleanup levels
  • Toxicological data evaluation and dose-response assessment
  • Establishing background concentrations and distinguishing background chemicals from site-related contaminants
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HHRA AND ERA EXPERIENCE

Experience

Our risk assessment project portfolio includes experience such as designing field sampling programs, conducting landowner surveys, interpreting complex data sets, distinguishing between site-related and offsite/background sources, working/negotiating with state and federal regulatory agencies, and providing expert witness testimony. We have conducted original research in field methods, performed third-party reviews for liability evaluation, presented results at national technical conferences, and participated in the development of risk assessment guidance documents.

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SEE SOME OF OUR WORK

Revitalizing the Old Yellowstone District Using Brownfield Funding
Casper, WY

After receiving an Environmental Protection Agency (EPA) Brownfields Assessment Grant for an area adjacent to its downtown core, the City of Casper began the process of returning its Old Yellowstone District into a destination for work and play
Excavator dropping soil

Environmental Support for Power Plant Closure Activities
Western United States

Leveraging its environmental expertise, regulatory relationships, and creative problem-solving, Trihydro supported the characterization, remediation, and closure of a power plant. 

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Conducting an HHRA and/or an ERA involves identifying hazards, assessing impacted media, determining population exposure, and evaluating toxicology. HHRAs and ERAs help stakeholders understand and manage environmental risks.
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NYREE MELANCON
RISK ASSESSOR

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