801 E CASINO RD Geotech Report 2022-10-25

Cascade High School Subsurface Exploration and Synthetic Turf Field 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 and geotechnical engineering study for the proposed Cascade High School synthetic turf field: The site location is shown on the "Vicinity Map," Figure 1. Existing site features and the approximate locations of the subsurface explorations referenced in this study, are presented on the "Site and Exploration Plan," Figure 2. Exploration boring logs and laboratory testing results are included in the Appendix. This report is based on information provided by D.A. Hogan & Associates, Inc. (D.A. Hogan) via electronic mail and our previous experience on the project site. Associated Earth Sciences, Inc. (AESI) provided geotechnical engineering services in support of portable classroom placements on campus in 1998. At the time this report was written, project plans were still being formulated. 1.1 Purpose and Scope The purpose of this study was to provide subsurface soil and shallow ground water data to be utilized in the design of the proposed Cascade High School synthetic turf field. Our study included a review of selected available geologic literature, completing six hollow -stem auger soil borings, and performing geologic studies to assess the type, thickness, distribution, and physical properties of the subsurface sediments and shallow ground water. Laboratory testing of grain -size distribution and organic content was completed on selected samples retrieved from the borings and results of the laboratory tests are included in the Appendix. A geotechnical engineering study was completed to determine geotechnical recommendations regarding site preparation, structural fill, turf subgrade preparation, and general recommendations for site drainage design. This report summarizes our current fieldwork and offers development recommendations based on our present understanding of the project. 1.2 Authorization Our study was accomplished in general accordance with our proposal dated February 10, 2017. This report has been prepared for the exclusive use of D.A. Hogan, 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. March 20, 2017 ASSOCIATED EARTH SCIENCES, INC. DDV/pc-170081ED01-2-ProJectSJ20170081JKEJWP Page 1