3800 RIVERFRONT BLVD Geotech Report 2023-05-04

I I I GEOTECHNICAL ENGINEERING REPORT RIVERFRONT BOULEVARD EVERETT, WASHINGTON I 1.0 INTRODUCTION 1.1 GENERAL I This report presents the results of a geotechnical engineering investigation performed by HWA GeoSciences Inc. (HWA) in support of design and construction of Riverfront Boulevard in Everett, Washington. It is our understanding that Shelter Holdings proposes to construct a new I roadway, designated Riverfront Boulevard, to support the proposed multi-phased Riverfront Development project. Riverfront Boulevard will connect 41st Street to the south and 36th Street to the North while providing primary access for the proposed mixed-use development. The I proposed roadway will be constructed across the Everett Landfill site as shown in the vicinity Map, Figure 1. The currently proposed geometry of Riverfront Boulevard and the associated development are shown on the Site and Exploration Plan, Figure 2. IThe purpose of our investigation was to evaluate the subsurface conditions along the proposed roadway, perform geotechnical engineering analyses and provide geotechnical recommendations Iin support of the roadway design. This report and the recommendations herein supersede all recommendations provided in previous Iversions of this report. 1.2 PROJECT DESCRIPTION I It is our understandingthat Shelter Holdings is proposing to developthe old Everett Landfill site g P p g with a multi-phased mixed-use development. The approximate layout of the proposed I development is shown in Figure 2. Access to each phase of the development will be provided by Riverfront Boulevard, which will extend from 41 St street in the south and 36th Street in the north. Riverfront Boulevard will consist of a grade supported roadway with sidewalks and planter areas. IThick and highly variable deposits of landfill refuse and compressible alluvial soils underlie the proposed alignment of Riverfront Boulevard. These soils have been surcharged to reduce I anticipated settlement across the site. However, long-term secondary settlements are expected to occur over the design life of the development and roadway. The proposed roadway and associated utilities will need to be designed to account for the anticipated settlement along the Ialignment.