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Technical Memorandum TO: Sean Story, PE, and Nathan Watson, PE, KPFF Consulting Engineers FROM: Tyler Cartwright, EIT, and Sean Gertz, PE DATE: December 15, 2022 RE: Summary of Geotechnical Engineering Services Port of Everett—Central Marina Fuel Dock Replacement Everett, Washington Project No. 0121058.010.013 Introduction This memorandum summarizes the results of geotechnical engineering services provided by Landau Associates, Inc. (Landau) in support of the Central Marina Fuel Dock Replacement project in Everett, Washington (site; Figure 1). Services were provided in accordance with the geotechnical scope outlined in the Subconsultant Services Agreement between Landau and KPFF Consulting Engineers (KPFF, project structural engineer), dated March 21, 2022. Project Understanding The Port of Everett (Port, project owner) proposes to replace a concrete fuel dock originally constructed in 1983. The dock is operated year-round and dispenses an average of 420,000 gallons of fuel annually. Clients include recreational boaters, fishing vessels, the Naval Station Everett, the City of Everett Police and Fire, the Washington Department of Fish and Wildlife, the U.S. Coast Guard, and the U.S. Coast Guard Auxiliary. The Port plans to continue using the existing fuel dock while a new dock is constructed in the project area shown on Figure 2. Central A and B Docks will be demolished to accommodate construction of the new dock. Dredging also may be required in the vicinity of the new dock; if required, dredging design will be completed by others. The new fuel dock will be supported by 24-inch-diameter, open-end steel pipe piles. The dock will move vertically on the piles, and the piles will provide lateral restraint of the dock. Pile axial resistance is not required. Based on bathymetry data in the Central Marina Phase 4 Dredging and G-Dock record drawings (Port of Everett 2020), Landau understands that the mudline elevation in the project area ranges from -12.25 feet (ft) to -16.25 ft, City of Everett datum. Regional Geology and Site Conditions Geologic information for the site and the surrounding area was obtained from the Geologic Map of the Everett 7.5-minute Quadrangle, Snohomish County, Washington (Minard 1985). Near-surface deposits along, and east of, West Marine View Drive are mapped as advance outwash, a unit that generally consists of clean sand with increased gravel content in its upper portions. Silt and fine- LA I SA N D A U 155 NE 100th St,Ste 302 • Seattle,WA 98125 - 206.631.8680