Andrew Barnes, P.G.

Andrew Barnes is a Principal Hydrogeologist based in California with more than 30 years of environmental and hydrogeological consulting experience focused on complex site characterizations, feasibility studies, groundwater remediation system conceptual design, groundwater production and delivery, landfill management systems, and the characterization and remediation of non-aqueous phase liquids (NAPLs).

As a project manager for multi-PRP groups, Andrew works closely with clients to develop technical solutions and regulatory strategies designed to achieve client objectives. He typically helps clients with soil, soil vapor and groundwater impact assessments, vapor intrusion assessment and mitigation, public participation, and the design and installation of remediation systems. His clients include water purveyors, commercial and industrial interests and regulated governmental agencies throughout the southwestern United States.

Routinely working with clients in the petroleum refining, petrochemical manufacturing, waste management, and land redevelopment sectors, Andrew leads remedial assessment and design for environmentally-impacted sites, and the development and application of new treatment technology for emerging compounds such as 1,4-dioxane. He also leads feasibility studies, hydrogeologic studies under RCRA and CERCLA, and geostatistical studies and numerical modelling. He has extensive experience in development of regulatory permitting and compliance strategies, assessment of NAPL origins, characterization and remediation of sites with soil and groundwater impacts, and post-closure maintenance of groundwater and landfill gas systems.

Andrew's experience also includes developing water supplies for municipal drinking water systems, assessing basin safe yield, assessment of aging water conveyance systems, and production well permitting.

He was also project manager and principal hydrogeologist for one of the largest brownfield redevelopment projects in California, where chlorinated dense NAPL (DNAPL) contributed to vadose zone and groundwater impacts. This project involved subsurface groundwater and DNAPL characterization, assessment of soil gas, sub-slab gas, and indoor air, and development of engineering controls and remedial approaches that allowed mixed use commercial and residential reuse of the site. For the Del Amo Superfund site, Andrew's groundwater flow and contaminant transport model was recognized by U.S. EPA's Kerr Laboratory as one of the most comprehensive regional models developed under their review, and which contributed to one of the first Technical Impracticability Waivers issued in California.

Contact Andrew Barnes at This email address is being protected from spambots. You need JavaScript enabled to view it. or +1-714-969-0800.

Career Summary: Andrew Barnes, P.G.

  • Specialties: Geoenvironmental Site Investigation and Remediation; Groundwater Assessment and Remediation; Specialized In Situ Treatment Technologies
  • Practice Areas: Geotechnical and Geoenvironmental Engineering
  • Disciplines: Hydrogeology
  • Education: B.A., Geology, University of California, Santa Barbara, 1987
  • Registration: Professional Geologist, California, 7511
Geosyntec Consultants
Geosyntec is a 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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