Syed Rehan, P.E., BCEE

Syed Rehan is a Senior Principal Environmental Engineer based in California with more than 22 years of experience focused on developing engineering solutions and regulatory compliance strategies for environmentally impaired sites impacted by the presence of chlorinated solvents, heavy metals, and hydrocarbons and petroleum products in soil, groundwater, soil vapors, and indoor air.


As a consultant, Rehan works with clients and their advocates to develop effective solutions to complex environmental restoration challenges and secure approval from regulatory agencies for a wide range of public and private sector projects. His clients include insurance and liability holding entities; residential and commercial development companies; academic institutions; construction, architectural, and project management companies; metal recycling operations; petroleum companies; and law firms.

Clients depend upon Rehan's in-depth understanding of U.S. EPA and Cal-EPA permitting regulations, including the Resource Conservation and Recovery Act (RCRA); the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) the Voluntary Clean-up Program; and the California Land Reuse and Revitalization Act.

He has extensive experience with assessment and management of subsurface vapor intrusion to indoor air, a new and developing environmental field in California and across the national. He advices attorneys, real estate developer, and private sector clients on vapor intrusion regulations, regulatory agency negotiations, assessment, and customized mitigation system design and optimization. He also is experienced in providing technical support to legal counsel related to stormwater cases and has advised clients in stormwater compliance, permit negotiations, and development of non-structural and structural best management practices (BMPs). Rehan has evaluated and provided detailed design of structural BMPs such as multi-media filtration systems; biofiltration swales; infiltration and detention basins; and porous and impermeable pavements.

To advance the state of the practice, Rehan has managed and led teams responsible for the design and implementation of chlorinated solvent and petroleum hydrocarbon remediation systems such as soil vapor extraction systems, dual phase extraction systems, air sparging systems, slurry walls, permeable reactive barriers, in situ and ex situ chemical oxidation, pump and treat systems, sub-slab depressurization systems, and various enhanced bioremediation technologies.

Contact Syed Rehan at This email address is being protected from spambots. You need JavaScript enabled to view it. or +1-510-836-3034.

Career Summary: Syed Rehan, P.E., BCEE

  • Specialties: Site Investigation and Remediation; Groundwater Assessment and Remediation; Brownfield Redevelopment Planning and Design; Subsurface Vapor Intrusion; Stormwater Management
  • Practice Areas: Contaminated Site Assessment and Cleanup, Water and Natural Resources, Water Management
  • Disciplines: Environmental Engineering, Water Resources Engineering
  • Education: M.Sc., Environmental Sciences and Technology, UNESCO-IHE Institute for Water Education, 2000; B.Sc., Civil Engineering; Aligarh Muslim University, 1995
  • Registration: California Professional Engineer, C67805; New York Professional Engineer, 085576; Illinois Professional Engineer, 062.060545; Board Cert Environ Eng 16-20004
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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