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33 <br />Tor <br />Djan Chandra, PE GE <br />Djan's area of expertise includes foundation design, soil reinforcement, slope <br />stability analysis, and pavement design/rehabilitation. With 33 years of experience, <br />he has successfully completed wastewater and waterworks projects throughout <br />Southern California for many sanitation and water agencies. His extensive <br />experience in design and application of geosynthetics reinforcements in <br />geotechnical engineering, including over steepened slopes, pavement subgrade <br />stabilization, and segmental retaining walls, has been proven an asset on a variety <br />of projects. <br />Geotechnical Engineer for a PFAS treatment plant that includes six 12-foot <br />diameter GAC vessels supported on a concrete pad and the associated piping and <br />site paving. Conducted field exploration consisting of two hollow -stem auger <br />borings to refusal depths of 11 to 15 feet into the gravel and cobble layers. <br />Prepared a geotechnical exploration report with recommendations for site grading, <br />seismic and foundation design parameters, and pavement. <br />Geotechnical Engineer for a <br />PFAS treatment facility that includes four 12-foot diameter, ion -exchange (IX) <br />vessels supported on a concrete pad and a pre -filtration system. Drilled and <br />sampled two exploratory borings to a depth of 261/2 feet. Provided geotechnical <br />recommendations for the project and prepared a report presenting the findings, <br />conclusions, and recommendations. Provided oversight for geotechnical and <br />special inspection and testing services during construction. <br />Geotechnical Engineer for <br />a PFAS treatment facility for Wells 3A and 5 through 8 at the City's Main Plant. The <br />new facility includes 16 to 20 new ion -exchange (IX) and/or GAC vessels with new <br />supply and waste tanks supported on concrete pads. The geotechnical exploration also evaluated an <br />alternative location within the plant, which is also being considered as a permanent location for additional 20 <br />new vessels. Advanced six borings to depths of 111/2 to 261/2 feet and collected soil samples for laboratory <br />testing. Provided oversight and coordination with the City, subcontractors, and project civil engineers for the <br />field exploration and development of the geotechnical recommendations for the project. <br />Geotechnical Engineer for a <br />PFAS treatment facility for Wells 1, 5, 7, 10, 12, 18, and 19 at the District's headquarters that consists of 6 pre- <br />treatment vessels and 22 new ion exchange (IX) vessels. Each vessel is 12-foot in diameter and 16.5-foot tall, <br />supported on a 2.5-foot-thick mat foundation. Other improvements include a booster pump station, new <br />piping, equipment, and site paving. The field exploration included exploratory borings to a depth of 50 feet <br />since the site is located in a liquefaction zone. Developed geotechnical recommendations for the project, <br />including mitigation measures for liquefaction potential, prepared a geotechnical exploration report, and <br />provided inspection and testing services during construction. The project is one of the largest PFAS Systems of <br />its kind to be installed in the country and can produce 19 million of treated groundwater per day. <br />City of Santa Ana On -Call Engineering Design Services for PFAS Treatment Systems UP NO. 22-133 A-42 <br />