Ruth Custance

Ruth Custance is a Senior Principal Environmental Scientist based in California with more than 20 years of experience focused on the development and effective communication of risk-based approaches for site assessment and remediation.

Ruth has lead project teams in utilizing the latest risk assessment and data analysis technologies to optimize remedial approaches. These approaches provide adequate risk reduction while being cost-effective. She has provided critical input into the risk management planning for proposed redevelopment properties both in the United States and globally. Applying her extensive project management experience involving state and federal Superfund programs, state voluntary cleanup programs, and technical interactions with state and local regulators, she develops comprehensive site assessment and remediation strategies. Her strategies not only meet the environmental stewardship and financial management objectives of her clients, but also fully address regulatory compliance issues.

In addition to her risk assessment practice, Ruth is actively involved in site assessment and remediation projects, working with clients such as the Los Angeles Unified School District on site redevelopment initiatives.

Contact Ruth Custance at This email address is being protected from spambots. You need JavaScript enabled to view it. or +1-805-897-3800.

Career Summary: Ruth Custance

  • Education: M.S., Public Health, University of Michigan School of Public Health 1989; B.A., Microbiology; University of California, San Diego, 1987
  • Practice Areas: Contaminated Site Assessment and Cleanup
  • Disciplines: Microbiology, Toxicological Sciences, Public Health
  • Specialties: Risk Assessment and Applied Toxicology; Site Investigation and Remediation; Brownfields Redevelopment Planning and Design; Environmental Management Assessment and Systems

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Geosyntec Consultants
Geosyntec is a specialized consulting and engineering firm that works with private and public sector clients to address new ventures and complex problems involving our environment, natural resources, and civil infrastructure.

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