Patrick Hsieh is a Senior Engineer with Dalton, Olmsted, & Fuglevand (DOF) based out of their Seattle, Washington office. Since 2016, Patrick has worked at DOF specializing in managing environmental concerns at complex sites (upland and sediment remediation as well as environmental compliance) with a focus on stormwater management for industrial clients in the Pacific Northwest. He is responsible for the completion of feasibility studies, corrective action plans, and engineering design for cleanups at superfund sites as well as for supporting environmental compliance engineering design at active industrial manufacturing facilities.

He has led the design and operation and maintenance (O&M) of air sparging, soil vapor extraction, groundwater extraction and treatment, stormwater treatment, dredge return water treatment, and in situ bioremediation systems for environmental remediation projects throughout the country. He has directed clients in improving industrial stormwater treatment to reach benchmarks, designed stormwater facilities to meet low impact development goals and aided clients in negotiations with regulators and third party groups. Patrick has evaluated the efficacy of hundreds of water treatment devices or best management practices to treat for metals, polychlorinated biphenyls, suspended solids, pH, volatile organic compounds, 1,4-dioxane, turbidity, chemical and biological oxygen demand in stormwater and wastewater.

Prior to DOF, he worked for 11 years in the environmental consulting field with AMEC Earth and Environmental (previously Geomatrix). Since 2016, Patrick has contributed to ITRC as a team member and trainer for ITRC's Stormwater BMP Evaluation team. Patrick earned a bachelor's (2001) and master's (2003) degree in chemical engineering from University of Rochester in Rochester, New York.  Patrick is certified as a Professional Engineer in Washington, Oregon, Alaska, and Nevada.