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Geotechnical <br />engineer for PFAS treatment plants at the two well sites located diagonally across a groundwater spreading <br />basin. Well No. 20 will have four ion -exchange (IX) vessels or six GAC vessels with a GAC backwash supply <br />tank, and a GAC backwash waste tank. Well No. 21 will have four IX vessels. Three borings were drilled to a <br />maximum depth of 50 feet. Geotechnical challenges included loose soils, shallow groundwater, and <br />liquefaction potential. Prepared a geotechnical exploration report presenting findings, conclusions, and <br />recommendations for the project. <br />Project Geotechnical Engineer <br />for 8 steel vessels added to an existing water treatment facility. The vessels, each approximately 10 feet in <br />diameter and weighing 150,000 pounds, were placed in a single row and supported on a mat foundation <br />system. Performed field exploration consisting of two Cone Penetrometer Test (CPT) soundings to a depth of <br />50 feet, developed mitigation measure for liquefaction potential and recommendations for foundation design, <br />and prepared a geotechnical exploration report. During construction, provided compaction testing and <br />concrete sampling and testing services. <br />Geotechnical Engineer for a PFAS treatment facility that <br />includes four 12-foot diameter, ion -exchange (IX) vessels supported on a concrete pad and a pre -filtration <br />system. Drilled and sampled two exploratory borings to a maximum depth of SO feet. Evaluated liquefaction <br />potential at the site and developed geotechnical recommendations for design and construction of the project. <br />Associate Engineer. Leighton conducted a <br />geotechnical engineering exploration for the Serrano Water District Wells 3 and 5 PFAS Treatment Plant. Our <br />team explored the subsurface conditions at the well site in order to provide geotechnical recommendations to <br />aid in design and construction of the project. The project included six 12-foot diameter GAC vessels supported <br />on a concrete pad. Other improvements include the associated piping and site paving. <br />• Kimberly Well 2 PFAS Water Treatment Plant, Orange County Water District, Fullerton, CA <br />• Sunclipse 10 PFAS Water Treatment Plant, Orange County Water District, Fullerton, CA <br />• Santa Ana Well 40 PFAS, Santa Ana, CA <br />• Santa Ana Crooke Station Wells 27, 28, and 31, Santa Ana, CA <br />• IRWD Well ET-1 PFAS Water Treatment Plant, Irvine Ranch Water District, Irvine, CA <br />• Downey Wells 4, 11, and 2, PFAS, Downey, CA <br />• IRWD Shallow Groundwater Unit (SGU) PFAS Treatment Plant, Irvine Ranch Water District, Irvine, CA <br />City of Santa Ana l OmCall Engineering Design Services for PEAS Treatment Systems RFP NO.22-133 AA3 <br />