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Susan E. Gahry, P.E.

Ms. Gahry is a California-Registered Chemical Engineer with more than 25 years of experience in environmental consulting, process engineering, project management, and engineering supervision. During this time, Ms. Gahry has had experience in managing and performing large-scale remediation projects, completing regulatory submittals and compliance documents, and overseeing all aspects of property transfers, including site investigations, cleanups, and closure. She has worked on projects pursuant to regulatory requirements of US EPA Region IX, California EPA Department of Toxic Substances Control (DTSC), California Regional Water Quality Control Board, San Francisco Bay and Central Valley, and local agencies. Most of her experience has been with projects in California, although she has worked on projects throughout the U.S.

Primary areas of responsibility for Ms. Gahry have included the following:

  • Management/implementation of turnkey remediation design, construction, operation, monitoring, and maintenance projects including soil vapor extraction/air sparging, dual phase extraction, and groundwater extraction and treatment;
  • Vapor intrusion assessment/mitigation, including soil gas sampling, indoor air sampling (with direct involvement in a South Bay project which including the collection of approximately 800 indoor air samples), and mitigation measures using HVAC controls, sub-slab depressurization systems, liners and small carbon units;
  • Environmental assessment/cleanup actions associated with property transfer and industrial site redevelopment for residential and commercial use;
  • Regulatory interface associated with adherence to cleanup orders, negotiations of prospective purchaser agreements, and contributions to groundwater plumes from adjacent sources, mainly for industrial clients;
  • Innovative treatment technology testing and implementation, including in-situ bioremediation and chemical oxidation. for recalcitrant chemicals; and
  • Preparation of regulatory documents including Remedial Investigations/Feasibility Studies (RI/FS), Remedial Action Plans (RAP), Remedial Design and Implementation Plans (RDIP), and Operation, Monitoring, and Maintenance (OM&M) Plans.


Daniel A. Balbiani, P.E.
Robert S. Creps, P.E.
James P. Dunn, P.G.
Kyle S. Flory, P.G.
Susan E. Gahry, P.E.
William W. Mast, P.G.
Carl J. Michelsen, P.G., C.HG.
Keith O’Brien, P.G., C.HG.
Nicholas C. Pogoncheff, P.G.


Peter D. Gorman, C.HG.
William Haldeman, L.G.
Kris McCormick, CAC, REA
Brian O’Neal, P.E.
Chris J. Baldassari, P.G.
Scott Morrison, P.E.
Gary Thomas, P.G.
Mark Winters, R.G.

Senior Personnel

Matthew Dahl, P.E.
John Alexander
Justin Patterson

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