STANTEC CONSULTING SERVICES, INC. (4)

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Project engineer for PFAS treatment plants at the two well sites located diagonally across a groundwater spreading basin. Well No. 20 will have four ion -exchange (IX) vessels or six GAC vessels with a GAC backwash supply tank, and a GAC backwash waste tank. Well No. 21 will have four IX vessels. Three borings were drilled to a maximum depth of 50 feet. Geotechnical challenges included loose soils, shallow groundwater, and liquefaction potential. Prepared a geotechnical exploration report presenting findings, conclusions, and recommendations for the project. Geotechnical Engineer for a PFAS treatment facility that includes four 12-foot diameter, ion -exchange (IX) vessels supported on a concrete pad and a pre -filtration system. Drilled and sampled two exploratory borings to a maximum depth of 50 feet. Evaluated liquefaction potential at the site and developed geotechnical recommendations for design and construction of the project. Project Engineer for a PFAS treatment facility for Wells 3A and 5 through 8 at the City's Main Plant. The new facility includes 16 to 20 new ion -exchange (IX) and/or GAC vessels with new supply and waste tanks supported on concrete pads. The geotechnical exploration also evaluated an alternative location within the plant, which is also being considered as a permanent location for additional 20 new vessels. Advanced six borings to depths of 111/2 to 261/2 feet and collected soil samples for laboratory testing. • Santa Ana Well 40 PFAS, Santa Ana, CA • Santa Ana Crooke Station Wells 27, 28, and 31, Santa Ana, CA • IRWD Well ET-1 PFAS Water Treatment Plant, Irvine Ranch Water District, Irvine, CA • Downey Wells 4, 11, and 2, PFAS, Downey, CA • IRWD Shallow Groundwater Unit (SGU) PFAS Treatment Plant, Irvine Ranch Water District, Irvine, CA City of Santa Ana', On -Call Engineering Design Services for PEAS Treatment Systems RFP NO. 22-133 A-45