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Rincon Consultants, Inc. <br />Environmental Scientists · Planners · Engineers <br />EDUCATION <br />PhD, Environmental <br />Engineering, University of <br />Southern California, 2013 <br />BS, Chemical Engineering, <br />UC Santa Barbara, 2007 <br />CERTIFICATIONS/ <br />LICENCES <br />Licensed Professional Civil <br />Engineer (California), <br />#87757 <br />Certified 40-hr HAZWOPER <br />Ryan Thacher, PhD, PE <br />SENIOR ENVIRONMENTAL ENGINEER <br />Dr. Thacher is an environmental engineer by training and has over 10 years of <br />experience in the fields of water quality and water resource engineering. Dr. Thacher <br />is experienced in projects involving the environmental fate and transport of chemical <br />constituents, water resource management, hydrodynamics, and water quality <br />regulation and compliance. He has been involved in several contaminated site <br />investigations in various capacities, including chemical fate and transport <br />investigations, using environmental forensics methods to determine source <br />contributions, and developing remediation strategies. Dr. Thacher has applied his <br />expertise in environmental chemistry to projects involving source identification and <br />environmental fate and transport of emerging contaminants including per- and <br />polyfluoroalkyl substances (PFAS), 1,4-dioxane, and hexavalent chromium. <br />In addition, he has experience in storm water permitting and compliance under the <br />Industrial General Permit (IGP), Construction General Permit (CGP), and Municipal <br />Separate Storm Sewer System (MS4) programs. Further, he has helped design and <br />implement modeling studies to site and design diffusers, and to evaluate the impact <br />of industrial discharge and treated wastewater on receiving waters. Dr. Thacher is <br />also involved in California water supply and drought issues, with expertise in <br />hydrodynamics and water quality within California's Bay-Delta estuary. <br />SELECTED PROJECT EXPERIENCE <br />Project Manager and Technical Analyst, Flooring Manufacturer, Orange County, <br />California <br />Assessed the transport and fate of PFAS in an industrial wastewater stream to <br />determine if the facility was compliant with Proposition 65. This evaluation included a <br />review of PFAS partitioning between biosolids and the liquid phase in the municipal <br />wastewater treatment process, and the potential for PFAS from the facility to pass <br />into drinking water aquifers as a result of existing uses for reclaimed water and <br />biosolids from the Los Angeles County Sanitation District. <br />Technical Reviewer, City of Eastvale – Homestead Industrial Project, Riverside <br />County, California <br />Dr. Thacher provided a technical peer review of a preliminary Water Quality <br />Management Plan developed for the Homestead Industrial Project in Riverside <br />County. He was tasked with evaluating the Water Quality Management Plan for its <br />adequacy and reliability in supporting the Environmental Impact Report, and <br />consistency with Water Quality Management Plan guidance documentation approved <br />by the Santa Ana Regional Water Quality Board. In addition, he conducted checks and <br />reviews of hydrologic calculations included with the Water Quality Management Plan. <br />Dr. Thacher identified sections of the Water Quality Management Plan that were <br />inadequate or inaccurate, and outlined an efficient approach to preparing a final <br />Water Quality Management Plan. <br />Project Manager and Technical Analyst, U.S. DOJ Facilities, California <br />Provided technical support to the U.S Department of Justice in defense of two Clean <br />Water Act citizen suits alleging violations of the Industrial General Permit. Following a <br />EXHIBIT 1