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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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