4730 COLBY AVE YMCA Geotech Report 2025-04-14

Subsurface Exploration, Geologic Hazard, and Snohomish County YMCA Geotechnical Engineering Report Everett, Washington Project and Site Conditions I. PROJECT AND SITE CONDITIONS 1.0 INTRODUCTION This report presents the results of our subsurface exploration, geologic hazard, and geotechnical engineering study for the construction of the new Snohomish County YMCA. The site location is shown on the "Vicinity Map," Figure 1, and approximate locations of the explorations completed by Associated Earth Sciences, Inc. (AESI) are shown on the "Site and Exploration Plan," Figure 2. We are familiar with the site through the completion of our Hydrogeology Report titled, "Stormwater Infiltration Assessment-YMCA of Snohomish County," dated January 17, 2018. For preparation of this report, we were provided with a 100% Design Development Plan Set, prepared by BCRA and dated January 25, 2018, and with a 100% Design Development Set Outline Specification - Everett YMCA, prepared by BCRA and dated January 25, 2018, which includes a previously completed geotechnical engineering study, prepared by Liu &Associates, Inc. and dated October 25, 2015. 1.1 Purpose and Scope The purpose of this study was to provide subsurface data to be utilized in the design and development of the referenced project. Our study included reviewing available geologic literature, reviewing previously completed explorations by AESI, reviewing explorations completed by others, and performing geologic studies to assess the type, thickness, distribution, and physical properties of the subsurface sediments and groundwater. Geotechnical engineering studies were completed to formulate recommendations for site preparation, grading, types of suitable foundations and floors, allowable foundation soil-bearing pressure, anticipated foundation and floor settlement, drainage considerations, and infiltration feasibility. This report summarizes our fieldwork and offers recommendations based on our present understanding of the project. 1.2 Authorization Our study was accomplished in general accordance with our scope of work and cost proposal, dated February 8, 2018. This report has been prepared for the exclusive use of YMCA of Snohomish County and their agents, for specific application to this project. Within the limitations of scope, schedule, and budget, our services have been performed in accordance with generally accepted geotechnical engineering and engineering geology practices in effect in this area at the time our report was prepared. No other warranty, express or implied, is made. February 26,2018 ASSOCIATED EARTH SCIENCES,INC. AWR/ms-170671E001-2-Projects120170671 lKElWP Page 1