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PROPOSALFDR <br />On -Call Engineering Design Services <br />James Christopher, PE, BCEE <br />Water Quality <br />James is a Vice President and the practice leader far drinking water <br />treatment for Tetra Tech. His knowledge of water chemistry and water <br />infrastructure design makes him highly qualified in defining, <br />evaluating, and implementing water quality solutions to the most <br />challenging problems. James has 42 years of professional <br />engineering experience and is highly qualified in environmental <br />engineering, with special expertise in water resources, water quality <br />and treatment, reverse osmosis and nanofiltration, granular activated <br />carbon, pumping system analysis/station design, facility planning, and <br />construction planning and administration. <br />EXPERIENCE <br />PFAS Treatment systems <br />Education <br />MS, Environmental <br />Engineering and Science, <br />University of Central Florida, <br />1980 <br />BS, Chemistry, Duke <br />University, 1976 <br />Registrations <br />Professional Engineer, <br />Florida, No. 34204 <br />Board Certified Environmental <br />Engineer (BCEE) Water <br />Supply Wastewater <br />Management <br />Years of Experience <br />Hidden Springs Water Treatment Plant Pilot Testing Program, <br />Orange County, FL. 2022 - Ongoing. Lead Process Engineer. L42 <br />Providing technical support for the design and implementation of a <br />pilot testing program to select a process for removal of total sulfides and total organic carbon from the <br />existing ground water source. The pilot test will test ozonation, catalytic GAC, GAC in the adsorption <br />and biological removal modes following ozonation and anion exchange resin following ozonation. <br />Lily Pond WTP-GAC Pilot Test and Final Design, Town of Cohasset, MA. 2020 - Ongoing. Lead <br />Process Engineer. Developed testing plan and permitted through Massachusetts Department of <br />Environmental Protection a GAC pilot program to test the removal of TOCs from the filtered water at the <br />3 M G D Lily Pond surface water treatment plant to reduce the level of disinfection byproducts within the <br />distribution system. The pilot test was run for six months across the summer, fall and winter seasons <br />and tested the removal in the adsorption and biologically active modes. Sampling and analysis of the <br />influent and GAC columns' effluent was performed twice per week. Testing also included limited <br />sampling of PFAS compounds in the pilot column feed and effluent to assess the occurrence and the <br />removal effectiveness of the GAC. A summary report was prepared to document the results, provide <br />design criteria and costs for implementation of the full-scale system. <br />E I I m s Meadow PFAS Pilot Testing and Final Design, Town of Coh asset, MA. 2021. Project <br />Manager for the RSSCT testing of ion exchange and GAG for the removal of six regulated PFAS <br />compounds to comply with the Massachusetts maximum contaminant level of 20 ng/L. The work was <br />funded by a grant from the Massachusetts Department of Environmental Protection. The scope of work <br />included the design of the testing program using RSSCT to test GAC and IX resin, interpretation and <br />presentation of the results and design of a full-scale system to remove PFAS from this groundwater <br />supply to the potable water system. Ion exchange was selected for the full-scale design. <br />Buena Ventura Lakes Water Treatment Plant Full Scale GAC Pilot, Toho Water Authority, <br />Kissimmee, FL. 2021. Technical Advisor. Toho Water needed to provide service from their Buena <br />Ventura Lakes WTP to an area outside its normal service area which caused THMs to exceed the <br />regulatory limit and the Florida Department of Environmental Protection requested the utility take <br />corrective action to lower the concentrations. GAC treatment was considered as an alternative that <br />could be implemented quickly within the constraints of the existing plant site. The full-scale installation <br />was proposed as a pilot test to expedite permitting. Four 2 0, 000 pound carbon contactors were <br />installed operating in parallel. Water quality and supplemental disinfection byproduct (DBP) testing was <br />performed during the initial 90 day operating period. Review, comment and editing of the testing plan <br />and final report were provided along with directions for the DBP testing and a GAC isotherm test to <br />estimate the carbon usage rate. A data analysis report and modelling of carbon change out frequencies <br />versus TOG removal was prepared to assist the utility with ongoing operation and optimization of <br />system performance. <br />TETRA TECH <br />