Mr. Leong is a Professional Engineer with GSI Environmental Inc. with over eight years of experience in environmental engineering. He specializes in several areas, including onsite wastewater treatment systems (OWTS), site characterization, soil and groundwater remediation, and environmental fate and transport of emerging contaminants.
He has a strong background in designing and managing OWTS projects for both residential and commercial properties across Southern California. His expertise includes comprehensive research, detailed design, preparation of construction documents, and effective coordination with diverse stakeholders.
Recently, Mr. Leong completed his master’s thesis as part of the Environmental Security Technology Certification Program (ESTCP, ER22-7482) at the Colorado School of Mines. His research focused on a lab-scale evaluation of a novel surface-modified clay adsorbent, comparing its effectiveness to granular activated carbon (GAC) and ion-exchange resin (IX) for the removal of per- and polyfluoroalkyl substances (PFAS) from groundwater and surface water. Utilizing rapid small-scale column tests (RSSCTs), he evaluated the performance and cost-effectiveness of both standalone and hybrid lead-lag column configurations with various media. This project aimed to identify potential cost savings for existing and proposed treatment systems nationwide.
In addition, Mr. Leong has also supported remediation efforts by identifying and addressing soil and groundwater contamination at numerous sites across California. His work has involved both organic and inorganic contaminants, employing remediation techniques such as soil vapor extraction (SVE), in-situ chemical oxidation (ISCO), and soil excavation.