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Earth Mechanics, Inc. <br />The Huntington Beach (HB) Channel and the Talbert Channel are in the <br />southeastern area of the City of Huntington Beach. The project involved <br />replacing and repairing portions of the existing sheet pile walls that have <br />corroded and degraded over time. <br />The HB Channel, within the sheet pile replacement limits, is asymmetrical <br />in cross-section and consists of a single earthen levee retained by sheet <br />piles along the northeast side of the channel, and a small graded earthen <br />slope on the southwest side of the channel adjacent to wetlands. The <br />Talbert Channel is a symmetrical channel formed by two rows of sheet pile <br />walls, one wall along the east levee and one wall along the west levee. <br />Generally, the sheet pile replacement involved installing new sheet piles immediately behind the <br />existing sheet piles and leaving the existing sheet piles in place. The total combined length, <br />along both channels, of the replacement sheet pile walls was approximately 16,157 feet. <br />EMI completed a geotechnical field investigation that included 20 exploratory boreholes and 54 <br />CPT soundings, conducted laboratory soil tests; performed various geotechnical analyses, <br />coordinated with the design -build team and OCPW, and prepared a geotechnical report. <br />Principal Elements: (1) EMI accomplished the geotechnical investigation and soil testing to <br />characterize soils along the channel alignments; (2) estimated engineering properties of soils <br />including strength, compressibility, density, expansion potential; (3) performed various analyses <br />including ground motion study for three -level earthquake design, soil liquefaction assessment, <br />seismically -induced settlement, evaluated global stability of sheet pile walls and levee slopes <br />under static and seismic conditions, determined bearing capacity and static settlement, <br />determined lateral earth pressures and estimated lateral soil springs for sheet pile walls, and <br />conducted seepage analysis; (4) prepared geotechnical report; (5) reviewed project plans and <br />specifications; and, (6) provided technical support during construction. <br />Special Features: The channel improvements had to satisfy Orange County and U.S. Army <br />Corps of Engineers design requirements; three -level earthquake design; and the geotechnical <br />analyses supported OCPW in applying for levee recertification from FEMA. <br />OCTA, 1-605/Katella Avenue Interchange Improvement Project, orange County, CA <br />Reference <br />OCTA <br />Josue Vaglienty, Senior Project <br />Manager, Highway Programs <br />(714) 560-5852 <br />jvaglienty@octa.net <br />Contract Details <br />EMI Fee: $162,000 <br />Dates: 2021 to Ongoing <br />Key Staff: Andrew <br />Korkos, Alahesh <br />Thurairajah, Michael <br />Hoshiyama <br />Relevance <br />• Subsurface geotechnical <br />investigation <br />• Soil classifications and <br />analysis <br />• Pavement condition survey <br />• Pavement rehabilitation <br />• Pavement design <br />• Grading and site clearing <br />The Orange County Transportation Authority (OCTA), in cooperation with Caltrans District 12 <br />and the City of Los Alamitos, proposes improving the 1-605/Katella Avenue Interchange and a <br />portion of Katella Avenue to improve freeway access, improve interchange traffic operations, <br />enhance safety, and improve pedestrian and bicycle facilities within the interchange area. <br />Improvements include modifications to the northbound and southbound ramps, and roadway <br />improvements along Katella Avenue between Coyote Creek and Civic Center Drive. <br />Proposal (RFP No. 23-123) City of Santa Ana <br />On -Call Geotechnical Engineering Services <br />