Item 17 - Agreements for On-Call Geotechnical Engineering Services

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Yorba Linda Water District Headquarters PFAS Treatment Facility YORBA LINDA, CA 101 The Yorba Linda Water District Headquarters PFAS Treatment Facility is one of the largest PFAS Systems of its kind to be installed in the nation, with a plant that can produce 25 million gallons of treated groundwater per day. Leighton provided geotechnical engineering services for a PFAS treatment facility for Wells 1, 5, 7, 10, 12, 18, and 19 at the District's headquarters that consists of 6 pre-treatment vessels and 22 new ion exchange (IX) vessels. Leighton developed geotechnical recommendations for the project, including mitigation measures for liquefaction potential, prepared a geotechnical exploration report, and provided inspection and testing services during construction. This project was awarded both "Outstanding Water Project" and "Project of the Year" at the 2022 American Society of Civil Engineers Orange County (ASCE OC) awards ceremony. City of Anaheim ANAHEIM, CA IMPERIAL HIGHWAYAND BIG SKY LANE WATER MAIN REPLACEMENT 12021 — 2022: This project consisted of a Design -Build Water main replacement of approximately 5,000 linear feet of existing pipeline along a portion of Imperial Highway and Big Sky Lane in Anaheim Hills. Leighton performed subsurface exploration along the pipeline alignment and provided geotechnical recommendations for excavation, shoring, backfill, and pavement placement. DWYER DRIVE, LINCOLN AVENUE AND DAHLIA DRIVE WATER MAIN REPLACEMENT 12022 — ONGOING: Design -Build Water main replacement of existing water main alignments at two locations within residential neighborhoods in Anaheim. The project involves replacement of approximately 4,700 linear feet of water main with 6-inch to 8-inch diameter ductile iron pipe. Leighton performed subsurface exploration along the pipeline alignment and provided geotechnical recommendations for excavation, shoring, backfill, and pavement placement. City of Newport Beach NEWPORT BEACH, CA JAMBOREE ROAD PAVEMENT REHABILITATION AND RECLAIMED WATER CONVERSION PROJECT 2021 — PRESENT: Leighton is providing geotechnical observation and testing, material testing, and special inspection services on this Pavement Rehabilitation and Reclaimed Water Conversion Project, spanning an approximate 1-mile section of Jamboree Road, a major vehicular artery between Coast Highway and Ford Road. Our team supports construction elements including cold milling of existing asphalt pavement and overlaying for a majority of the east and westbound lanes of Jamboree; full -depth asphalt concrete repair in localized sections of pavement; concrete sidewalk removal and reconstruction; concrete median curb and gutter removal and reconstruction; and new storm drainage infrastructure. ANNUAL SLURRY SEAL PROGRAM 12021 — PRESEN Leighton provided materials testing & special inspection services as part of the City of Newport Beach's 2021-2022 Citywide Slurry Seal Program. Project areas included East and West Newport Heights, Cliffhaven, Westcliff Villas, and the John Wayne Park Parking Lot. The project entailed application of 2,900,000 square -feet of Type I Emulsion -Aggregate Slurry (EAS) and CQS-1 h quickset emulsifier at identified locations throughout the City. Our team is provided field inspections during EAS placement, preparation of daily reports, collection of samples, laboratory conformance testing, final close-out report preparation along with management and quality control support.