3535 RIVERFRONT BLVD Geotech Report 2023-02-22

1.1 GENERAL FINAL GEOTECHNICAL REPORT PUBLIC AMENITIES—3-ACRE PARK 111 EVRETT RIVERFRONT DEVELOPEMENT EVERETT, WASHINGTON 1. INTRODUCTION This report summarizes the results of the geotechnical engineering studies performed by HWA GeoSciences Inc. (HWA) for the 3-Acre Park Development in Everett, Washington. The location of the project is shown on the Site Vicinity Map, Figure 1, and on the Site and Exploration Plan, Figure 2. The proposed improvements include the development of the 3-Acre Park site as well as the completion of a portion of the Railroad Corridor Trail that extends south from 3 Acre Park to its current terminus south of Lift Station 33. Our work included advancing a series of subsurface explorations at specific locations within the areas of proposed improvements to evaluate subsurface soil and ground water conditions, as well as conducting appropriate laboratory tests on selected soil samples to determine relevant engineering properties. Geotechnical engineering analyses were conducted to provide recommendations for the proposed 3-Acre Park development including park buildings, floating dock, debris boom mooring dolphin, and foundation improvements for the existing crane structure. The foundation recommendations include design seismic parameters, and considerations for soil liquefaction effects. Also provided, are recommendations related to trail preparation considerations, including embankments, pavement structure, and long-term settlement conditions. 1.2 PROJECT UNDERSTANDING Our understanding of the project is based on discussions with and design information provided by the project team led by MacLeod Reckord. Upon complete buildout, improvements for the park will include construction of a parking area, a restroom building, a gangway and floating dock in the river, and a viewing platform associated with foundation improvements for an old crane structure. Trail improvements will also be constructed along the crest of the river bank and will tie into the Rail Corridor Trail to the south. Layout of the proposed improvements are indicated on the Site and Exploration Plan, Figure 2. Since we submitted an initial version of this report, on March 31 st of 2017, responsibility for construction of the park has been shifted from the City of Everett to Shelter Holdings. Shelter Holdings has elected to construct the proposed improvements in phases. Phase 1 of work will include construction of the restroom building,parking lot and access, children's play area, and utilities including drainage and sanitary sewer for the restroom. Improvements for future phases include installing picnic shelters, finish connecting the Riverfront trail and installing riverbank stabilization.