2202 100TH ST SW Geotech Report 2022-10-25

a Subsurface Exploration, Geologic Hazard,and Stephens Everett Property Preliminary Geotechnical Engineering Report Everett, Washington Project and Site Conditions I. PROJECT AND SITE CONDITIONS 1.0 INTRODUCTION This report presents the results of Associated Earth Sciences, Inc's. (AESI's) subsurface exploration, geologic hazard, and preliminary geotechnical engineering study for the proposed Stephens Everett property development located in Everett, Washington. Our recommendations are preliminary in that the project is still early in the design phase. The site location is shown on the "Vicinity Map," Figure 1. The approximate locations of explorations completed for this study are shown on the "Existing Site and Exploration Plan," (Figure 2), which uses a topographic survey by West Alliance Professional Land Surveyors, dated September 7, 2017, as a basis. The proposed development and exploration locations are presented on the "Site and Exploration Plan" (Figure 3), which uses a preliminary site plan by 2012 Architecture, dated September 17, 2018, as a basis. Interpretive exploration logs of the subsurface explorations completed for this study are included in the Appendix. 1.1 Purpose and Scope The purpose of this study was to provide subsurface data to be used in the design and development of the above-referenced project. Our study included reviewing selected available geologic literature, excavating seven exploration pits, and performing geologic studies to assess the type, thickness, distribution, and physical properties of the subsurface sediments and shallow groundwater. Geotechnical engineering studies were completed to formulate preliminary recommendations related to site preparation and grading, the type of suitable foundations and floors, allowable foundation soil bearing pressures, anticipated foundation and floor settlement, pavement recommendations, drainage considerations, and shallow infiltration feasibility. This report summarizes our current fieldwork and offers preliminary recommendations based on our present understanding of the project. We recommend that we be allowed to review the recommendations presented in this report and revise them, if needed, when a project design has been finalized. 1.2 Authorization This report has been prepared for the exclusive use of Airport 100 LLC, and its agents, for specific application to this project. Our work was performed in accordance with our scope of work and cost proposal, dated November 12, 2018. Within the limitations of scope, schedule, and budget, our services have been performed in accordance with generally accepted geotechnical engineering and engineering geology March 29,2019 ASSOCIATED EARTH SCIENCES,INC. TG/ms-180567E001-2-Projects\20180567\KEIWP Page 1