RISK ASSESSMENT

• Human Health
• Ecological
• Fate and Transport Modeling
• Statistical Analysis
• Biological Surveys
• Ecotoxicity Database

Tetra Tech has performed over 150 human health and ecological risk assessments involving hazardous substances at National Priorities List (NPL) and non-NPL sites for industrial and government clients. These projects have led to the development of tools for calculating risk and cleanup goals following U.S. EPA and State of California Department of Toxic Substance Control protocols. Tetra Tech performs risk assessments using realistic exposure pathways and parameters that lead to reduced site cleanup costs.

• Developed spreadsheet-based tools for evaluating carcinogenic risks and noncarcinogenic hazards from organic chemicals and metals via multiple exposure pathways.
• Used human health and ecological risk assessments to develop cleanup goals that were cost effective and still protective of the environment.
• Developed an ecological toxicity database of 200 organic compounds and metals for plants, soil invertebrates, amphibians, birds, and mammals.
• Established new statistical tools for calculating exposure point concentrations and comparing site conditions with background locations.
• Used American Society for Testing and Material’s (ASTM) Risk-Based Corrective Action (RBCA) approach , Massachusetts Department of Environmental Protection (MDEP) petroleum risk approach , and the American Petroleum Institute’s Decision Support System (API DSS) to evaluate potential risks from petroleum hydrocarbons.

Research & Development

Tetra Tech has developed many models that incorporate risk assessment modules, including RIVRISK and EMAGIS.  For more information on Risk Assessment contact Tom Grieb at (925) 283-3771 or tom.grieb@tetratech.com